Light box having a fresnel lens

Details Light box having a fresnel lens Light box having a fresnel lens

Category

G - Physics

Subcategory

02

Subsubcategory

B

CPC

240/147

IPC codes

G02B 19/00 (2006.01) F21V 5/00 (2006.01) F21V 7/00 (2006.01) F21V 13/04 (2006.01) G02F 1/1335 (2006.01)

Type

Patent

Patent number

CA 1269649

Description

LIGHT BOX HAVING A FRESNEL LENS ABSTRACT OF THE DISCLOSURE A light box comprises a source of light, a reflector and a Fresnel lens. The lens provides nearly constant illumination of an object such as a liquid crystal cell by collimating light parallel to a normal to the cell. Thus the cell will exhibit a nearly uniform electro-optical response. The reflector preferably is parabolic, while the light source preferably is a line source such as a fluorescent tube.

Application Number

526249

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