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(11) | EP 2 322 843 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | LED bulb |
| (57) An LED bulb (3) comprises a lamp housing (31), a lamp cap (32), a core tube (33)
disposed inside the lamp housing (31), a plurality of LED plates (34) mounted on the
core tube (33), and a controller (35) serving to manipulate an on-off operation of
the LED plates (34) . Wherein, the controller (35) is substantially disposed inside
a room (331) of the core tube (33), and the core tube (33) has one end thereof connected
to the lamp cap (32), so as to facilitate a free substitution of the controller (35)
and promote the using convenience. The connection of the core tube (33) and the lamp
cap (32) serves to radiate the heat created by the LED plates (34) from the core tube
(33) toward the lamp cap (32) and the lamp housing (31) for a speedy dissipation and
preventing from burning the LED bulb (3) under a high temperature.
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1. Field of the Invention
[0001] The present invention relates to a bulb structure, particularly to an LED bulb with the preferable heat dissipation.
2. Description of the Related Art
[0002] Fig. 1 discloses a conventional LED bulb 1. The LED bulb 1 includes a head 11, a base 12 attached to the head 11, a shield 13 disposed above the base 12, a core tube 14 located inside the shield 13, multiple LED plates 15 disposed on the core tube 14, a core base 16 inside the base 12 connected to the core tube 14, and a circuit panel 17 electrically connected to the core base 16. Wherein, the core tube 14 is formed into a hollow configuration by centralizing with respect to an axis. On the core tube 14, a plurality of recesses 141 are defined for an embedment of the LED plates 15. The disposition of the core tube 14 is specialized in lighting; the hollow core tube 14 along with the core base 16 assists in radiating the ensued heat or thermal, therefore the conventional LED bulb 1 substantially obtains effects of illumination and heat dissipation.
[0003] In operation, by virtue of the mutual engagement between the core tube 14 and the core base 16 and the location of the core base 16 set within the lamp cap 12, the disposition of the lamp cap 12 overly occupies the space and inevitably reduces the illumination of the LED bulb 1, with the result that the illumination area of the LED plates 15 are affected. Furthermore, although the core base 16 can 1 function as a radiator, the core base 16 wrapped in the lamp cap 12 causes the heat scattered from the core tube 14 to be unable to dissipate. In this manner, the base 12 may not efficiently cool down if the LED bulb 1 still lasts the lighting and the production of heat and may become subject to ignition when the circuit panel 17 and the LED plates 15 are over heated under the high temperature, thus still requiring improvements.
SUMMARY OF THE INVENTION
[0004] The object of the present invention is to provide an LED bulb that can facilitate a convenient replacement without changing the typical appearance, attain a swift dissipation, and decrease the occurrence of ignition as a result of the over-heated LED bulb.
[0005] An LED bulb comprising a lamp housing, a lamp cap engaged with said lamp housing, a core tube disposed inside said lamp housing and providing a room defined at a central thereof, a plurality of LED plates mounted on said core tube, and a controller controlling an on-off operation of said LED plates.
[0006] Characterized in that, said controller is disposed within said room, and said core tube has one end thereof connected to said lamp cap, so as to permit the heat produced by said LED plates to radiate through said core tube, said lamp cap, and said lamp housing.
[0007] In addition to the dissipation, the present invention substantially prevents the ignition of the LED bulb while being subjected to a high temperature.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008]
Fig. 1 is a schematic view showing a conventional invention;
Fig. 2 is an exploded view showing a structure of the present invention;
Fig. 3 is a schematic view showing the present invention in assemblage;
Fig. 4 is a schematic view showing the present invention in operation;
andFig. 5 is another perspective view showing the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] Figs. 2 and 3 show a first preferred embodiment of the present invention. An LED bulb 3 in accordance with the present invention comprises a lamp housing 31, a lamp cap 32 engaged with the lamp housing 31, a core tube 33 disposed inside the lamp housing 31, a plurality of LED plates 34 mounted on the core tube 33, and a controller 35 controlling an on-off operation of the LED plates 34; wherein, the core tube 33 defines a room 331 at a central thereof for accommodating the controller 35. Herein, the core tube 33 can be formed by any feasible contours, for example, an octagonal core tube 33 is performed in the figures. Preferably, there are multiple ribs 332 defining on an outer periphery of the core tube 33 for engaging with and positioning the LED plates 34. Furthermore, the core tube 33 has one end thereof connected to the lamp cap 32, thereby permitting the heat produced by the LED plates 34 to radiate through the core tube 33, the lamp cap 32, and the lamp housing 31. For promoting a swift dissipating efficiency, a colloid member 36 explicitly shown in Figs. 3 and 4 is preferably arranged at a joint of the lamp housing 31 and the lamp cap 31.
[0010] Referring to Figs. 3 and 4, after assembling the elements as mentioned above, the controller 35 inside the room 331 of the core tube 33 could preferably adapt to a bulb with a typical appearance, like the style of the LED bulb 1 in Fig. 1 and could dispose without occupying large space. The controller 35 mainly serves to switch the illumination of the LED plates 34 and allows a feasible replacement if necessary, so as to increase the using convenience. When in use, the electrified controller 35 activates the LED plates 34 to shine, and concurrently, since the LED plates 34 are disposed on the core tube 33 and the core tube 33 is directly connected to the lamp cap 32, the LED bulb 3 can entirely illuminate without any obstruction, namely to thoroughly perform the brightness of the LED plates 34. In addition, the core tube 33 as defined connects to the lamp cap 32, which renders the lamp cap 32 able to substantially contact with the lamp housing 31. Accordingly, the heat produced by the LED plates 34 could be dispersed from the core tube 33 and traveled through the lamp cap 32 and the lamp housing 31 for expanding the radiating area, so that the LED plates 34 is kept from burning or igniting incurred by the heat made by the LED plates 34 abiding in the LED bulb 3 to cause a high-temperature condition. Therefore, the present invention preferably attains the swift heat dissipation.
[0011] Referring to Fig. 5, a second preferred embodiment of the present invention is shown. The LED bulb 3 similarly comprises the lamp housing 31, the lamp cap 32, the core tube 33, the LED plates 34 and the controller 35. Especially, the lamp housing 31 further includes a transparent portion 311 and a radiating portion 312 whose one end is connected to the transparent portion 311 and the other end is connected to the lamp cap 32. Moreover, a plurality of radiating ribs 37 are disposed between the radiating portion 312 and the core tube 33 at intervals. Thereby, turning on the LED plates 34 allows the generated heat to be radiated by the core tube 33 and the lamp cap 32. In addition to the auxiliary radiating function provided by the radiating ribs 37 and the radiating portion 312, the radiating area of the LED bulb 3 is preferably increased to promote the heat dispersing effect.
[0012] To sum up, the present invention takes advantage of the controller disposed in the core tube, thereby saving the space, permissibly adapting to a bulb with the typical appearance, and allowing a direct replacement for increasing the convenience of using. The connection of the core tube and the lamp cap further integrally performs and exposing the illumination of the LED plates without covering and leads to the heat radiating through the lamp cap and the lamp housing, thus providing a favorable dissipation and preventing the over-heated LED bulb from burning.
1. An LED bulb (3) comprising a lamp housing (31), a lamp cap (32) engaged with said
lamp housing (31), a core tube (33) disposed inside said lamp housing (31) and providing
a room (331) defined at a central thereof, a plurality of LED plates (34) mounted
on said core tube (33), and a controller (35) controlling an on-off operation of said
LED plates (34);
characterized in that, said controller (35) being disposed within said room (331), and said core tube (33) having one end thereof connected to said lamp cap (32), so as to permit the heat produced by said LED plates (34) to radiate through said core tube (33), said lamp cap (32), and said lamp housing (31).
characterized in that, said controller (35) being disposed within said room (331), and said core tube (33) having one end thereof connected to said lamp cap (32), so as to permit the heat produced by said LED plates (34) to radiate through said core tube (33), said lamp cap (32), and said lamp housing (31).
2. The LED bulb as claimed in claim 1, wherein said lamp housing (31) includes a transparent
portion (311) and a radiating portion (312) whose one end engages with said transparent
portion (311) and the other end engages with said lamp cap (32).
3. The LED bulb as claimed in claim 2, wherein, a plurality of radiating ribs (37) are
disposed between said radiating portion (312) and said core tube (33) at intervals.
4. The LED bulb as claimed in claim 1, wherein a colloid member is arranged at a connection
of said lamp housing (31) and said lamp cap (32).
5. The LED bulb as claimed in claim 2, wherein a colloid member is arranged at a connection
of said lamp housing (31) and said lamp cap (32).
6. The LED bulb as claimed in claim 1, wherein a plurality of ribs (332) are defined
on an outer periphery of said core tube (33) for engaging with and positioning said
LED plates (34).
7. The LED bulb as claimed in claim 2, wherein a plurality of ribs (332) are defined
on an outer periphery of said core tube (33) for engaging with and positioning said
LED plates (34).