Film lens and a surface light source using the same

Details Film lens and a surface light source using the same Film lens and a surface light source using the same

1994-03-22

1997-01-28

Nelms, David C.

Liquid crystal cells, elements and systems

Particular structure

Lens or prism separate from projection system

362 31, 362 32, 385147, 349 62, G02F 113

Patent

active

055982808

ABSTRACT:
A film lens comprises a light transmitting base having one side and an opposite side, a plurality of concave or convex unit lenses formed on the one side of the light transmitting base, and a plurality of projections formed on the opposite side of the light transmitting base and having a profile height not smaller than the wavelength of a source light and not greater than 100 .mu.m. In this arrangement, when the film lens is placed on a smooth surface of a light guide plate of a surface light source of the edge-light type, the projections on the reverse side of the light transmitting base can secure a gap with a width not smaller than the wavelength of the source light between the film lens and the light guide plate. Thus, the source light can be uniformly distributed without hindrance throughout the light guide plate as it is totally reflected by the surface of the guide plate. In the surface light source using the film lens, moreover, the lens can provide a uniform luminance in a desired angular range, and a uniform luminance distribution can be obtained for the whole surface without concentration in the vicinity of the light source.

REFERENCES:
patent: 4729067 (1988-03-01), Ohe
patent: 4924356 (1990-05-01), French et al.
patent: 5394255 (1995-02-01), Yokota et al.

Affiliated with

Also associated with

Rating

Film lens and a surface light source using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Film lens and a surface light source using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Film lens and a surface light source using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-944851