EP 2329306 A1 20110608 - VARIABLE FOCUS OPTICAL SYSTEM
Title (en)
VARIABLE FOCUS OPTICAL SYSTEM
Title (de)
OPTISCHES SYSTEM MIT VARIABLEM FOCUS
Title (fr)
SYSTÈME OPTIQUE À FOCALE VARIABLE
Publication
Application
Priority
US 2008075679 W 20080909
Abstract (en)
[origin: WO2010030267A1] A variable focus illumination system includes a light source which projects light forwardly, in the path of the light from the source, a movable lens forward of the light source which is mounted for axial movement towards and away from the light source, and a stationary lens is mounted forward of the moving lens. By design, the lens combination creates an image of the light source which is rearward of the actual light source, and movement of the movable lens focuses the light projected forwardly from the image. In comparison to a single lens system, in this dual lens system, the positioning accuracy required in the moving lens in order to achieve a given positional accuracy of focus may be an order of magnitude lower. In accordance with another aspect of the invention, the movable lens is formed as a unit with an opposed, spaced aperture of fixed diameter.
IPC 8 full level
G02B 7/04 (2006.01); G02B 7/08 (2006.01); G02B 27/20 (2006.01)
CPC (source: EP)
G02B 7/08 (2013.01); G02B 27/20 (2013.01); G06K 7/10732 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
WO 2010030267 A1 20100318; CN 102150066 A 20110810; EP 2329306 A1 20110608; EP 2329306 A4 20110831; JP 2012502349 A 20120126
DOCDB simple family (application)
US 2008075679 W 20080909; CN 200880131068 A 20080909; EP 08799347 A 20080909; JP 2011526024 A 20080909