(19)
(11)EP 3 133 338 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
06.05.2020 Bulletin 2020/19

(21)Application number: 14889677.2

(22)Date of filing:  16.04.2014
(51)Int. Cl.: 
F21V 5/04  (2006.01)
F21V 7/22  (2018.01)
F21V 7/00  (2006.01)
F21V 19/02  (2006.01)
F21L 4/00  (2006.01)
G02B 19/00  (2006.01)
F21V 5/00  (2018.01)
F21Y 115/10  (2016.01)
(86)International application number:
PCT/CN2014/075502
(87)International publication number:
WO 2015/157943 (22.10.2015 Gazette  2015/42)

(54)

LENS, LENS SYSTEM AND APPLICATIONS THEREOF

LINSE, LINSENSYSTEM UND ANWENDUNGEN DAVON

LENTILLE, SYSTÈME DE LENTILLE ET LEURS APPLICATIONS


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(43)Date of publication of application:
22.02.2017 Bulletin 2017/08

(73)Proprietors:
  • Hangzhou Great Star Tools Co., Ltd.
    Zhejiang 310019 (CN)
  • Hangzhou Great Star Industrial Co., Ltd.
    Zhejiang 310019 (CN)

(72)Inventor:
  • YU, Wentian
    Hangzhou Zhejiang 310019 (CN)

(74)Representative: Appleyard Lees IP LLP 
15 Clare Road
Halifax HX1 2HY
Halifax HX1 2HY (GB)


(56)References cited: : 
CN-A- 101 018 975
CN-A- 103 672 420
CN-U- 203 363 685
US-A1- 2005 152 153
CN-A- 102 734 673
CN-A- 103 672 420
CN-U- 203 848 200
US-A1- 2008 247 173
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Field of the Invention



    [0001] This disclosure relates to an optical device, and especially relates to a lens and a lens system and uses thereof.

    Description of the Prior art



    [0002] With the development of semiconductor material and process, light emitting diode (LED) is replacing traditional light source gradually. This results from the fact that the energy consumption of LED is far less than that of common incandescent lamps reaching the same brightness due to LED's special optical theory, and that LED has some advantages such as long lifetime, non-pollution and so on, which has a wide prospect in the field of illumination and backlight.

    [0003] Among the LED illuminating products, in order to get proper light distribution and illumination intensity, a lens is often installed in front of the LED bead to converge light, such as using Fresnel lens to turn the light emitted from its focus into parallel light.

    [0004] Moreover, in order to further make the most of LED light, currently the mainstream method is setting a chamber on the lens and placing LED light source in the chamber. Since the light emitted from the LED pointolite distributes in a 180-degree space, it can be done according to the theory above to make all the light emitted from LED enter the lens and adjust the emitting direction of incident light according to the lens structure, so as to achieve the effects such like convergence and dodging.

    [0005] In some practical conditions, there is a specific request for the light spot of emergent light, which can be achieved by adjusting the relative position between the LED light source and the lens.

    [0006] U.S. Publication No. 2008/0247173 A1 discloses a lens system for LED lights. The optical device for distributing light produced by a white LED or other light-producing device includes a lens portion that refracts the light to provide a desired light intensity distribution, and a collimating portion that internally reflects light from the white LED.

    [0007] In order to meet all the requirements above, it is necessary to obtain the shape of lens by an accurate analog computing. Currently this kind of lens generally includes a front surface, a side surface and a rear surface. The rear surface defines a chamber as an area for placing LED light source, so as to make all light from LED limited in the chamber. In this case, the cambered surface shapes of the front surface, side surface and rear surface are calculated and derived according to the designed optical path, which also involves the mutual coordination among every surface. This is especially important to realize the control of the optical path.

    [0008] Without considering the cost of lens material, the design above is relatively easy to achieve. With further consideration of the cost of lens material, various products are designed to save material, which is by reducing the distance between the front surface and the rear surface, i.e. making lens thinner, to save material. It is required that the shape precision of cambered surfaces of the front surface, rear surface and side surface and the requirement of fitting between surfaces is even higher, which makes the design more difficult and the design cycle longer.

    [0009] Likewise, as far as processing lens, the more of the surfaces which need an accurate control or are hard to process, the process of the lens is more difficult, which thus affects the yield of products.

    [0010] Therefore, a person skilled in the art devotes to developing a lens which can realize high capacity factor of LED light source (or light source similar to LED), functions of convergence and focusing, as well as advantages of saving material, provided with simple structure, and reducing the demanding accuracy requirement for optical surface as much as possible.

    Summary of the Invention



    [0011] To achieve the objective above, the present invention provides a lens system as defined in claim 1. Aspects or embodiments not covered by the claims do not form part of the invention but are part of the disclosure and represent background information that is useful for understanding the invention.

    [0012] The lens includes a front surface, a rear surface, a side surface extending between the front surface and the rear surface. The front surface is located at the front part of the lens, and the rear surface is located at the rear part of lens. The rear surface defines a rear-facing chamber. The front surface includes a central surface and an edge surface connected in a surrounded manner with the central surface. The edge surface extends between the central surface and the side surface; the lens defines a central axis; the chamber includes a side wall and a bottom, the side wall and the bottom define a space of the chamber, and the central axis passes through the central surface and the bottom; lines corresponding to the edge surface on the central cross section which are edge lines, are consisted of segments parallel to the central axis and segments perpendicular to the central axis in an alternately connecting manner, that is similar to the shape of the right-angle step.

    [0013] Further, any cross section of the lens along the central axis which is a central cross section is of the same shape, which defines that the lens is an axisymmetric body, and the central shaft is the central axis.

    [0014] Further, a line corresponding to the central surface on the central cross section which is a central line is an arc line. Alternatively, the central surface is a cambered surface. Further, the direction of an arc-shaped convex of the central line is away from the bottom, i.e. the central surface bulges towards the front of the lens.

    [0015] Further, the extending direction of the edge lines parallel to the central axis is same as the direction of the arc-shaped convex of the central line, and the edge lines extend away from the central line in the direction perpendicular to the central axis, i.e. the edge surface and the central surface roughly form a bowl shape, and the opening of the bowl is located in the front of the lens, opposite to the opening of the chamber.

    [0016] Further, lines corresponding to the side wall on the central cross section which are side wall lines, are straight lines or arc lines.

    [0017] Further, the side wall lines are parallel to the central axis, i.e. the side wall is cylindrical.

    [0018] Further, the bottom is a cambered surface or a plane. When the bottom is a cambered surface, the convex direction of the cambered surface is unlimited, which can be the same as or opposite to the convex direction of the central surface. The principle is that the bottom cooperates with the central surface to form a convex lens or to realize an effect of a convex lens.

    [0019] Further, the side wall cooperates with the side surface to meet that a reflected light is parallel to the central axis, and the reflected light is reflected by the side surface after an incident light being emitted from a pointolite located at the central axis and entering the lens from the side wall. Under the condition that the refractive index of the lens and the position of the light source are determined, for the optical path of refraction and reflection, a derivation is gone through on the curve corresponding to the side surface on the central cross section using mathematical methods, and a curvilinear equation can be obtained, which can determine the cambered surface morphology of the side surface.

    [0020] Further, the size of the edge surface meets that the reflected light reflected by the side surface is directly emitted from the edge surface. Combining with the above feature that the reflected light is parallel to the central axis, at this time, the emergent light of the edge surface is collimated light beam.

    [0021] Further, the shape of the side surface meets that the incident light entering from the side wall is totally reflected by the side surface.

    [0022] Further, the central surface cooperates with the bottom to meet that if the incident light emitted from the pointolite located at the central axis enters the lens from the bottom, the corresponding emergent light is emitted from the central surface only. In the condition that the refractive index of the lens is determined, the size matching of the central surface and the bottom can be obtained through a refractive index equation.

    [0023] Further, the shape of the edge surface meets that the emergent light emitted from the central surface is not blocked by the edge surface, i.e. the step height of the edge surface shall not block the emergent light emitted from the central surface.

    [0024] Further, the side surface is plated with a total reflection film. Further, the total reflection film is silver. Further, a material of the lens is polymethylmethacrylate (PMMA). Further, the light source is located at the central axis of the lens. Further, the light source can move along the central axis.

    [0025] Further, the range of the movement of the light source is within the inside of the chamber of the lens, including the position which is 0 mm apart from the chamber. Further, the range of the movement of the light source is from 0 mm apart from the chamber to 10 mm deep in the chamber.

    [0026] Further, when the light source moves from 0 mm apart from the chamber to 10 mm deep in the chamber, the maximum included angle of the emergent light emitted from the central surface of the lens is 8 to 90 degree.

    [0027] Further, the light source is a LED light source or similar to a LED light source, i.e. the light source provided with the same characters, such as good monochromaticity, the emitted light being distributed in a 180 degree space, etc., as a LED light source.

    [0028] The lens system is applicable to a flashlight with the function of variable focus.

    [0029] The lens and lens system have advantages below:
    1. 1. It can make full use of light emitted from LED light source (or similar to LED light source) to achieve a high capacity factor of optical energy.
    2. 2. It divides the emergent light into collimating emergent light and adjustable emergent light, and it can be very convenient to adjust the proportion of these two kinds of light in design to meet different practical requirements.
    3. 3. The range of the adjustable light spot is wide, which can meet various practical requirements.
    4. 4. Only the side surface needs a higher processing precision or difficulty, which reduces processing difficulty.
    5. 5. The lens is similar to a bowl shape, which saves material.

    Brief Description of the Drawings



    [0030] 

    Fig.1 is a front view according to a preferred embodiment of the lens of this invention;

    Fig.2 is a sectional view along line A-A in Fig.1;

    Fig.3 is a schematic drawing showing incidence and emergence of part of the collimating light according to the lens shown in Fig.2, which only shows the light on the right side of the central axis;

    Fig.4 is a schematic drawing showing incidence and emergence of all the collimating light according to the lens shown in Fig.2;

    Fig.5 is a schematic drawing showing incidence and emergence of part of the collimating light according to the lens shown in Fig.2, and the light source is located outside the chamber, which only shows the light on the right side of the central axis;

    Fig.6 is a schematic drawing showing incidence and emergence of all the focusing light according to the lens shown in Fig.2, and the light source is located outside the chamber;

    Fig.7 is a schematic drawing showing incidence and emergence of part of the focusing light according to the lens shown in Fig.2, and the light source is located inside the chamber, which only shows the light on the right side of the central axis;

    Fig.8 is a schematic drawing showing incidence and emergence of all the focusing light according to the lens shown in Fig.2, and the light source is located inside the chamber;

    Fig.9 is a schematic drawing showing incidence and emergence of all the light according to the lens shown in Fig.2, and the light source is located inside the chamber;

    Fig.10 is a calculation graph showing the curve corresponding to the side surface on the central cross section according to the lens shown in Fig.2;

    Fig.11 is a graph showing the critical point of the curve corresponding to the side surface on the central cross section according to the lens shown in Fig.2;

    Fig.12 is a schematic drawing according to another preferred embodiment of the lens of this invention, and the convex direction of the cambered surface of the bottom is away from the central surface;

    Fig.13 is a schematic drawing according to another preferred embodiment of the lens of this invention, and the bottom is a plane;

    Fig.14 is a schematic drawing according to a preferred embodiment of the flashlight using the lens system of this invention, and the LED light source is located at the opening of the chamber of the lens;

    Fig.15 is a schematic drawing showing that the LED light source of the flashlight shown in Fig.14 is located inside the chamber of the lens.


    Detailed Description of the Preferred Embodiments



    [0031] Combining the figures, the following further explain the conception, specific structure and technical effect of this invention to fully understand the purpose, characters and effects of this invention.

    [0032] The lens 1 shown in Fig.1 and Fig.2 includes a front surface 2, a rear surface 3 and a side surface 4 extending between the front surface 2 and the rear surface 3; the rear surface defines a rear-facing chamber 5; the front surface 2 includes a central surface 201 and an edge surface 202 connected with the central surface 201 in a surrounding manner; the edge surface 202 extends between the central surface 201 and the side surface 4; the lens 1 defines a central axis 6, and any cross section of the lens along the central axis, i.e. the central cross section, has the same shape, which defines that lens is an axisymmetric body, the central shaft thereof is the central axis 6; the chamber 5 includes a side wall 501 and a bottom 502, the side wall 501 and the bottom 502 define the space of the chamber, the central axis 6 passes through the central surface 201 and the bottom 502; the lines corresponding to the edge surface 202 on the central cross section, i.e. edge lines 204, are consisted of segments parallel to the central axis 6 and segments perpendicular to the central axis 6 in an alternately connecting manner. The line shape is similar to the shape of the right-angle step, i.e. the lines corresponding to the edge surface 202 on the central cross section are step-shaped, formed by connecting a plurality of segments parallel to or perpendicular to the central axis 6.

    [0033] The line corresponding to the central surface 201 on the central cross section, i.e. a central line 203, is an arc line, which defines that the central surface 201 is a cambered surface which is symmetrical about the central axis 6. The cambered surface is a sphere surface in this embodiment, whose convex direction is opposite to the opening direction of the chamber 5, and is same as the extending direction of the edge surface 202 along the central axis 6. In the meanwhile, the edge surface 202 extends away from the central surface 201 in the direction perpendicular to the central axis 6. The side wall 501 of the chamber 5 is parallel to the central axis 6, i.e. the side wall 501 is cylindrical.

    [0034] The lens 1 should be used together with the light source located at the central axis 6. The following is taking the pointolite as example to further explain the characteristics of the lens 1. As shown in Fig.3 and Fig.4, a pointolite 7 located at the central axis 6 provides the incident light which enters the lens 1 through the side wall 501, the reflected light reflected by the side surface 4 is parallel to the central axis 6, and is finally emitted from the edge surface 202. Since the edge surface 202 includes only the ring surface perpendicular to or parallel to the central axis 6, the emergent light emitted from the edge surface 202 is also parallel to the central axis 6, which achieves the collimating emitting of the incident light. Under the condition of using the side wall 501 and the edge surface 202 with mentioned shapes above and the lens material (refractive index) determined, it needs to only calculate accurately the cambered surface shape to achieve the collimation function. In the meanwhile the total reflection is achieved on the side surface 4 (the deriving calculating method about the side surface 4 will be described in detail below). In term of the difficulty of processing, the side wall 501 of the lens 1 and the edge surface 202 of the lens 1 include only the surface perpendicular to or parallel to the central axis 6, so that the processing is relatively simple. Only the side surface 4 needs a strict precision controlling, which reduces interaction effect between optical surfaces extremely.

    [0035] Under the condition that the lens material (refractive index) is determined, in order to achieve the total reflection of the side surface 4, the shape of the side surface 4 will be further restricted. When it is unable to achieve the total reflection of the side surface 4 in design for some specific size requirements, the side surface 4 can be plated with a total reflection film, for example, silver.

    [0036] As shown in Fig. 5 to 8, the pointolite 7 is located at the central axis 6, and the pointolite 7 can move along the central axis 6 into the inside of the chamber 5. Under the condition of the lens material (refractive index) being determined, it can be done to get a variety of combinations of sizes of the central surface 201 and the bottom 502 through the refraction equation, so as to achieve that all the emergent light corresponding to the incident light entering the lens 1 from the bottom 502 is emitted from the central surface 201. In this embodiment, the central surface 201 and the bottom 502 are round spherical surface and elliptical spherical surface respectively and have the same convex direction, and form a convex lens together, and converge the incident light, so as to make the emergent light form a uniform light spot in a certain range. At this point, the shape of the edge surface 202 (or the step height of the stepped structure) cannot block the emergent light emitted from the central surface 201. When the pointolite 7 gradually moves into the chamber 5, the maximum included angle of the emergent light increases with it, which achieves the adjustment of the size of light spot.

    [0037] Fig.9 shows the whole ray diagram of the light emitted from the pointolite 7 after focused and collimated by the lens 1.

    [0038] Fig.10 is a graph of the curve equation corresponding to the side surface on the central cross section, which comprises Y axis, i.e. the central axis, the optical path 9, the curve 10 corresponding to the side surface on the central cross section, the side wall line 11 parallel to Y axis and the included angles a, b, c and d. The calculating method of curve equation is explained below in detail:
    Setting the lens parameters: r - the opening radius of the chamber at the bottom of the lens, R - the radius of the lens bottom, n -- the refractive index of the lens.

    [0039] Objective: under the condition of the parameters above, forming a curve equation y=f(x) of the collimated light totally reflected
    1. 1. Solve the tangential equation at which the point Pn is located.







      So, the slope of the linear equation which passes through this point:

      Substitute the coordinate Pn(Xn,Yn) into the equation, the tangential passing through the point Pn meets the equation:

      Also regard approximately the adjacent point Pn+1 is located at the tangential.
    2. 2. The light equation at which the point Pn+1 is located





    3. 3. Constraint conditions:
      The ultimate slope determined by the critical angle of total reflection




      Since it is not easy to solve the equation directly, suppose a limit situation: when a → 90°, n ≥ √2 = 1.414 can realize total reflection, which can be achieved when adopting PMMA and PC material; when a → 0°, substitute in and get: when n > 1, the cambered surface can realize total reflection, it is obviously consistent;
      Suppose


      This function monotonically decreases in 0 < a < 90°. Therefore, when the refractive index n is determined, if the cambered surface can totally reflect the light of the initial incident angle a = θ, the light of a' = θ -Δθ (θ and Δθ are both larger than 0) can be also totally reflected by the cambered surface certainly.
      It can be known by the above determination of the particular values that, when a → 90° the total reflection can occur as long as the refractive index is larger than 1.414,. Therefore, when the angle which is smaller than 90°, the total reflection can also occur, the result of a → 0° verifies the correctness of the reasoning.
      Therefore, this curve can achieve total reflection for any initial incident angle of the light, and it is only necessary to consider the requirement of height in lens structure design.
    4. 4. Solve the discrete solution of the curve equation:
      Solve the equation set of equation (1) and (2), use P0' coordinate as Pn and substitute a=1° into the equations, so as to get the equation set about X and Y.



    [0040] Solve the equation set of equation (3) and (4) to get P1(X1,Y1)
    Use P1(X1,Y1) as P0 and substitute a=2° into the equation (1) and (2) to get a new equation set.



    [0041] Similarly, solve the equation set of equation (5) and (6) to get P2 (X2,Y2).

    [0042] So, a series of point P coordinates can be obtained.

    [0043] Using statistical software, such as Excel and MATLAB, to fit discrete points P0->Pn into the multinomial curve equation: y = f(x).

    [0044] Similarly it can be solved by programming, the program is shown below:





    [0045] As shown in Fig.11, the extending critical point 14 of the curve 10 can be determined by the optical path 12 and the curve 10, wherein the optical path 12 is an optical path which is produced by light entering from the very bottom of the side wall, and it meets the refraction relation:
    sinθ1= n×sinθ2, n is the lens refractive index, θ1, θ2 are respectively the incident angle and refractive angle of light. In order to achieve that the incident light from the side wall can all reach the side surface, the terminal that the curve 10 extends upward should not be lower than the critical point 14. The critical point 14 also defines the size of the edge surface.

    [0046] The same method can be also used to analyze the matching relation between the central surface and the bottom. At this point, it needs to be done to analyze the optical path produced by the light entering from the extreme edge of the bottom which is away from the central axis, making the extension width of the central surface enough to cover the refractive light in the optical path, thus to meet that when the incident light emitted from the pointolite located at the central axis enters the lens from the bottom, the corresponding emergent light is emitted from the central surface only.

    [0047] The lens shape based on this invention is not limited by the structure as shown in the embodiment above. Fig.12 indicates an alternative lens shape, with the convex direction of the cambered surface of the bottom 502 being far away from the central surface 201. And Fig.13 indicates an alternative lens shape, with the bottom 502 being plane.

    [0048] It is also worth to be noted that the shape of the side wall 501 can be various; considering the curve equation of the segment of the side wall when calculating, through the calculation method above, the cambered surface of the side surface matching the side wall can be obtained.

    [0049] The various lenses above can cooperate especially with LED light sources (or light source similar to LED) to form a lens system, which can achieve the functions of focusing and collimating while getting a high capacity factor. When a LED light source is located at the central axis 6 and its moving range is within the inside of the chamber 5 (including 0 distance from the chamber 5), the light emitted from the LED light source can be totally received by the side wall 501 and the bottom 502. When adjusting the position of the LED light source within the chamber 5, it can be achieved to control the size of the emergent light spot.

    [0050] In a more specific embodiment, the lens material is polymethylmethacrylate, and the refractive index is 1.49. It is designed that, when the range of the movement of the light source is from 0 to 10 mm deep in the chamber 5, the variation range of the maximum included angle of the emergent light emitted from the central surface 201 of the lens 1 is 8 to 90 degrees.

    [0051] The lens system above can be applied to a flashlight with the function of variable focus and works as the light source and optical element of the flashlight. Fig.14 and Fig.15 show a flashlight using the lens system of this invention, wherein the flashlight 15 comprises a handle 17 and a lens cone 18, which both adopt telescopic structures; thereby it can stretch and retract within limits. The lens 1 and the LED light source 16 are respectively fixed on the lens cone 18 and the handle 17. The function of variable focus is achieved by relative movement from stretching and retracting between the handle 17 and the lens cone 18. Fig.14 and Fig.15 indicate respectively that the LED light source 16 is located at the chamber opening of the lens 1 and within the chamber of the lens 1. The relative movement of the handle 17 and the lens cone 18 is not limited to the way above, but both can adopt a thread structure to achieve the telescopic function. Any connecting method which makes a relative movement between the handle 17 and the lens cone 18 can achieve the function of variable focus of the flashlight.

    [0052] The lens system above can also be applied to the other applications which need the light spot size adjustment (or the alternation of focusing and diverging), such as the flash lamp of camera and stage illumination etc.

    [0053] Moreover, it is pointed out that, because of the effects of the lens processing, the assembly accuracy of the flashlight and the size of the LED light source, in practice, some of the collimated light shall not be collimatingly emitted, which will cause the fact that, in the light spot would appear a bright ring whose size varies with the movement of the LED light source. It is depended on the processing and assembly accuracy in practice and the selection of the LED light source size.

    [0054] The preferred embodiment of this invention is described in detail above. It shall be known that according to this invention, an ordinary one skilled in this art does not need any creative work to conceive the modifications and variations. Therefore, any person skilled in this art can get any technical solution by logically analyzing, inferring and limited experiments, which should be in the protecting scope defined by claims of this invention.


    Claims

    1. A lens system comprising a lens (1), wherein, the lens (1) comprises a front surface (2), a rear surface (3), a side surface (4) extending between the front surface (2) and the rear surface (3); the rear surface (3) defines a rear-facing chamber (5); the front surface (2) comprises a central surface (201) and an edge surface (202) connected in a surrounding manner with the central surface (201); the edge surface (202) extends between the central surface (201) and the side surface (4); the lens (1) defines a central axis (6); the chamber (5) comprises a side wall (501) and a bottom (502), the side wall (501) and the bottom (502) define a space of the chamber (5), and the central axis (6) passes through the central surface (201) and the bottom (502); lines corresponding to the edge surface (202) on the central cross section which are edge lines (204), are consisted of segments parallel to the central axis (6) and segments perpendicular to the central axis (6) in an alternately connecting manner; any cross section of the lens (1) along the central axis (6) which is a central cross section is of the same shape; a line corresponding to the central surface (201) on the central cross section which is a central line (203) is an arc line; wherein, the direction of an arc-shaped convex of the central line (203) is away from the bottom (502), the extending direction of the edge lines (204) parallel to the central axis (6) is same as the direction of the arc-shaped convex of the central line (203), and the edge lines (204) extend away from the central line (203) in the direction perpendicular to the central axis (6); wherein, the side wall (501) cooperates with the side surface (4) to meet that a reflected light is parallel to the central axis (6), and the reflected light is reflected by the side surface (4) after an incident light being emitted from a pointolite (7) located at the central axis (6) and entering the lens (1) from the side wall (501); the size of the edge surface (202) meets that the reflected light reflected by the side surface (4) is emitted directly from the edge surface (202); the shape of the side surface (4) meets that the incident light entering from the side wall (501) is totally reflected by the side surface (4); the central surface (201) cooperates with the bottom (502) to meet that if the incident light emitted from the pointolite (7) located at the central axis (6) enters the lens (1) from the bottom (502), the corresponding emergent light is emitted from the central surface (201) only; the shape of the edge surface (202) meets that the emergent light emitted from the central surface (201) is not blocked by the edge surface (202), and wherein, the lens system comprises the lens (1) and a light source which provides the incident light for the lens (1); wherein the light source is located at the central axis (6) of the lens (1); the light source can move along the central axis (6); wherein the range of the movement of the light source is within the inside of the chamber (5) of the lens (1); the range of the movement of the light source is from 0 mm apart from the chamber (5) to 10 mm deep in the chamber (5); wherein, when the light source moves from 0 mm apart from the chamber to 10 mm deep in the chamber, the maximum included angle of the emergent light emitted from the central surface (201) of the lens (1) is 8 to 90 degrees.
     
    2. The lens system according to Claim 1, wherein, lines corresponding to the side wall (501) on the central cross section which are side wall lines (11), are straight lines or arc lines.
     
    3. The lens system according to Claim 2, wherein, the side wall lines (11) are parallel to the central axis (6).
     
    4. The lens system according to Claim 1, wherein, the bottom (502) is a cambered surface or a plane.
     
    5. The lens system according to Claim 1, wherein, the side surface (4) is plated with a total reflection film; preferably, the total reflection film is silver.
     
    6. The lens system according to any one of Claims 1 to 5, wherein the light source is a LED light source.
     
    7. The uses of the lens systems of any one of Claims 1-6, wherein, the lens system is applicable to a flashlight with the function of variable focus.
     


    Ansprüche

    1. Linsensystem, das eine Linse (1) umfasst, wobei die Linse (1) eine vordere Oberfläche (2), eine hintere Oberfläche (3), eine Seitenoberfläche (4), die sich zwischen der vorderen Oberfläche (2) und der hinteren Oberfläche (3) erstreckt, umfasst; die hintere Oberfläche (3) eine nach hinten zeigende Kammer (5) definiert; die vordere Oberfläche (2) eine zentrale Oberfläche (201) und eine Randoberfläche (202), die auf eine umgebende Weise mit der zentralen Oberfläche (201) verbunden ist, umfasst; sich die Randoberfläche (202) zwischen der zentralen Oberfläche (201) und der Seitenoberfläche (4) erstreckt; die Linse (1) eine zentrale Achse (6) definiert; die Kammer (5) eine Seitenwand (501) und eine Unterseite (502) umfasst, die Seitenwand (501) und die Unterseite (502) einen Raum der Kammer (5) definieren und die zentrale Achse (6) durch die zentrale Oberfläche (201) und die Unterseite (502) hindurchgeht; Linien, die der Randoberfläche (202) in dem zentralen Querschnitt entsprechen und die Randlinien (204) sind, aus Segmenten parallel zu der zentralen Achse (6) und Segmenten senkrecht zu der zentralen Achse (6) auf eine abwechselnd verbindende Weise bestehen, ein beliebiger Querschnitt der Linse (1) entlang der zentralen Achse (6), der ein zentraler Querschnitt ist, die gleiche Form aufweist; eine Linie, die der zentralen Oberfläche (201) auf dem zentralen Querschnitt entspricht und eine zentrale Linie (203) ist, eine Bogenlinie ist; wobei die Richtung einer bogenförmigen konvexen Krümmung der zentralen Linie (203) von der Unterseite (502) weg ist, die Ausdehnungsrichtung der Randlinien (204) parallel zu der zentralen Achse (6) gleich der Richtung der bogenförmigen konvexen Krümmung der zentralen Linie (203) ist und sich die Randlinien (204) von der zentralen Linie (203) in der Richtung senkrecht zu der zentralen Achse (6) weg erstrecken; wobei die Seitenwand (501) mit der Seitenoberfläche (4) zusammenwirkt, um zu erfüllen, dass ein reflektiertes Licht parallel zu der zentralen Achse (6) ist, und das reflektierte Licht durch die Seitenoberfläche (4) nach einem einfallen Licht reflektiert wird, das von einem Pointolit (7) emittiert wird, der sich auf der zentralen Achse (6) befindet, und in die Linse (1) von der Seitenwand (501) eingetreten ist; die Größe der Randoberfläche (202) erfüllt, dass das reflektierte Licht, das durch die Seitenoberfläche (4) reflektiert wird, direkt von der Randoberfläche (202) emittiert wird; die Form der Seitenoberfläche (4) erfüllt, dass das einfallende Licht, das von der Seitenwand (501) eintritt, eine Totalreflexion durch die Seitenoberfläche (4) erfährt; die zentrale Oberfläche (201) mit der Unterseite (502) zusammenwirkt, um zu erfüllen, dass, falls das einfallende Licht, das von dem Pointolit (7) emittiert wird, der sich auf der zentralen Achse (6) befindet, in die Linse (1) von der Unterseite (502) eintritt, wobei das entsprechende ausgehende Licht nur von der zentralen Oberfläche (201) emittiert wird; die Form der Randoberfläche (202) erfüllt, dass das ausgehende Licht, das von der zentralen Oberfläche 201 emittiert wird, nicht durch die Randoberfläche (202) blockiert wird, und
    wobei das Linsensystem die Linse (1) und eine Lichtquelle umfasst, die das einfallende Licht für die Linse (1) bereitstellt, wobei sich die Lichtquelle auf der zentralen Achse (6) der Linse (1) befindet; sich die Lichtquelle entlang der zentralen Achse (6) bewegen kann; wobei der Bewegungsbereich der Lichtquelle innerhalb des Inneren der Kammer (5) der Linse (1) liegt; sich der Bewegungsbereich der Lichtquelle von 0 mm von der Kammer (5) entfernt bis 10 mm tief in die Kammer (5) hinein erstreckt; wobei, wenn sich die Lichtquelle von 0 mm von der Kammer entfernt zu 10 mm tief in die Kammer hinein bewegt, der maximale eingeschlossene Winkel des ausgehenden Lichts, das von der zentralen Oberfläche (201) der Linse (1) emittiert wird, 8 bis 90 Grad beträgt.
     
    2. Linsensystem nach Anspruch 1, wobei Linien, die der Seitenwand (501) in dem zentralen Querschnitt entsprechen und die Seitenwandlinien (11) sind, gerade Linien oder Bogenlinien sind.
     
    3. Linsensystem nach Anspruch 2, wobei die Seitenwandlinien (11) parallel zu der zentralen Achse (6) sind.
     
    4. Linsensystem nach Anspruch 1, wobei die Unterseite (502) eine gewölbte Oberfläche oder eine Ebene ist.
     
    5. Linsensystem nach Anspruch 1, wobei die Seitenoberfläche (4) mit einem Totalreflexionsfilm plattiert ist; wobei der Totalreflexionsfilm bevorzugt aus Silber besteht.
     
    6. Linsensystem nach einem der Ansprüche 1 bis 5, wobei die Lichtquelle eine LED-Lichtquelle ist.
     
    7. Verwendungen des Linsensystem nach einem der Ansprüche 1-6, wobei das Linsensystem auf eine Taschenlampe mit der Funktion eines variablen Brennpunktes anwendbar ist.
     


    Revendications

    1. Système de lentille comprenant une lentille (1), dans lequel la lentille (1) comprend une surface avant (2), une surface arrière (3), une surface latérale (4) s'étendant entre la surface avant (2) et la surface arrière (3) ; la surface arrière (3) définit une chambre (5) tournée vers l'arrière ; la surface avant (2) comprend une surface centrale (201) et une surface de bord (202) reliée de manière périphérique à la surface centrale (201) ; la surface de bord (202) s'étend entre la surface centrale (201) et la surface latérale (4) ; la lentille (1) définit un axe central (6) ; la chambre (5) comprend une paroi latérale (501) et un fond (502), la paroi latérale (501) et le fond (502) définissent un espace de la chambre (5), et l'axe central (6) passe à travers la surface centrale (201) et le fond (502) ; des lignes correspondant à la surface de bord (202), sur la section transversale centrale, qui sont des lignes de bord (204), sont composées de segments parallèles à l'axe central (6) et de segments perpendiculaires à l'axe central (6) de manière à ce qu'ils soient reliés alternativement ; toute section transversale de la lentille (1), le long de l'axe central (6), qui est une section transversale centrale est de même forme ; une ligne correspondant à la surface centrale (201), sur la section transversale centrale, qui est une ligne centrale (203) est une ligne en arc ; dans lequel la direction d'une convexité en forme d'arc de la ligne centrale (203) s'éloigne du fond (502), la direction d'extension des lignes de bord (204) parallèles à l'axe central (6) est identique à la direction de la convexité en forme d'arc de la ligne centrale (203), et les lignes de bord (204) s'éloignent de la ligne centrale (203) dans la direction perpendiculaire à l'axe central (6) ; dans lequel la paroi latérale (501) coopère avec la surface latérale (4) de telle sorte qu'une lumière réfléchie soit parallèle à l'axe central (6), et la lumière réfléchie est réfléchie par la surface latérale (4) après qu'une lumière incidente ait été émise par un pointolite (7) situé au niveau de l'axe central (6) et ait pénétré dans la lentille (1) depuis la paroi latérale (501) ; la taille de la surface de bord (202) est telle que la lumière réfléchie par la surface latérale (4) est émise directement depuis la surface de bord (202) ; la forme de la surface latérale (4) est telle que la lumière incidente pénétrant depuis la paroi latérale (501) est totalement réfléchie par la surface latérale (4) ; la surface centrale (201) coopère avec le fond (502) de telle sorte que si la lumière incidente émise depuis le pointolite (7) situé au niveau de l'axe central (6) pénètre dans la lentille (1) depuis le fond (502), la lumière émergente correspondante soit émise uniquement depuis la surface centrale (201) ; la forme de la surface de bord (202) est telle que la lumière émergente émise par la surface centrale (201) n'est pas occultée par la surface de bord (202), et
    dans lequel le système de lentille comprend la lentille (1) et une source lumineuse qui fournit la lumière incidente pour la lentille (1) ; dans lequel la source lumineuse est située au niveau de l'axe central (6) de la lentille (1) ; la source lumineuse peut se déplacer le long de l'axe central (6) ; dans lequel la plage de mouvement de la source lumineuse se situe à l'intérieur de la chambre (5) de la lentille (1) ; la plage du mouvement de la source lumineuse va d'un écart de 0 mm par rapport à la chambre (5) à une profondeur de 10 mm dans la chambre (5) ; dans lequel, lorsque la source lumineuse se déplace d'un écart de 0 mm par rapport à la chambre à une profondeur de 10 mm dans la chambre, l'angle inclus maximum de la lumière émergente émise depuis la surface centrale (201) de la lentille (1) est de 8 à 90 degrés.
     
    2. Système de lentille selon la revendication 1, dans lequel des lignes correspondant à la paroi latérale (501) sur la section transversale centrale, qui sont des lignes de paroi latérale (11), sont des lignes droites ou des lignes en arc.
     
    3. Système de lentille selon la revendication 2, dans lequel les lignes de paroi latérale (11) sont parallèles à l'axe central (6).
     
    4. Système de lentille selon la revendication 1, dans lequel le fond (502) est une surface bombée ou un plan.
     
    5. Système de lentille selon la revendication 1, dans lequel la surface latérale (4) est revêtue d'un film à réflexion totale ; le film à réflexion totale est de préférence en argent.
     
    6. Système de lentille selon l'une quelconque des revendications 1 à 5, dans lequel la source lumineuse est une source lumineuse à DEL.
     
    7. Utilisation des systèmes de lentille selon l'une quelconque des revendications 1 à 6, dans laquelle le système de lentille peut être appliqué à une lampe de poche à fonction de focalisation variable.
     




    Drawing



























    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description