Patent ID: 6113251
Filing Date: 2000-09-05
Classification: F21V,G03B

Abstract:
A transmission screen system comprising:a transmission screen having a variety of diffusing elements, said transmission screen comprising a Fresnel lens sheet provided on the light-entering side of the transmission screen, and a lenticular lens sheet containing a large number of lenticular lenses and a large number of light-diffusive fine particles, provided on the light-exiting side of the transmission screen, anda projector for projecting light on the transmission screen to project thereon an image having a large number of picture elements, whereina maximum diffusing element is any of the lenses on the lenticular lens sheet,a minimum diffusing element is the light-diffusive fine particles, andwhen the size of the maximum diffusing element of the transmission screen is an arrangement pitch of the lenticular lenses designated by r, the size of the minimum diffusing element of the transmission screen is a mean particle diameter of the light-diffusive fine particles designated by d, and the picture element pitch on the transmission screen is designated by P, r, d and P fulfilling the following conditions:r/P.ltoreq.1/4.0 and 1 .mu.m.ltoreq.d.