| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a micro optical system screen capable of widening a left and right viewing angle, retaining total reflection conditions and keeping the appropriate thickness of a screen even when a black mask (BM) is applied to the emission side with a proper BM ratio. Ž<P>SOLUTION: Any one of the following three optical elements is employed for an incident surface side surface shape of a diffusion film: a micro composite optical system element prepared by combining a cylindrical aspherical condenser lens 5, a cylindrical hemispherical lens 6 and a condensing prism 8 for longitudinal condensing; a micro composite optical system element prepared by combining an aspherical condenser lens 6, a spherical lens and a total reflection type cylindrical elliptic surface; and a micro optical system element which takes in light from a first lens incident surface having an opening and a focal distance different from each other in longitudinal and lateral directions of the element and totally reflects the light at a second lens total reflection surface having a curved shape made by sliding and shifting a non-axial curved part of a reflected effective focal length (REFL) having a focus near the incident surface along an axial curved part of a parent focal length (PFL) having a focus near the incident surface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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