70.3: Distinguished Contributed Paper: Wide Angle Projection Optics for Compact Rear Projector

Abstract

We have developed a new projection optics with the exceptionally wide field angle of 160 degrees and the short projection distance of 125 mm with a 62 inch screen. It is constructed based on the Direct Projection Method which does not need a back mirror. In this paper, we will describe our new optical design concept and the characteristics of a prototype optical system.

70.1: Invited Paper: Ultra-Thin Rear Projector

“…Figure 3 shows the actual product that has a small depth of 260 mm and was put into market for business use on Dec. 2002. In this SID05 Symposium, we will present a further improved projection optics, which has a projection angle of 160 degrees [9]. This optics was already demonstrated in the trading show (CEATEC JAPAN 2004).…”

“…We discuss a parametric study on the projection optics we developed for UTRP [1], [9]. Figure 7 shows the following parameters used in this section.…”

“…P lens approaches to zero when effective field-angle is larger than 25 degrees, however it becomes increasingly larger when the angle becomes smaller than 25 degrees: This means that the Petzval condition is not required to be met for controlling the field curvature when the effective field-angle is small value located on the off-axis area. Kuwata [9] will make a detailed discussion of this phenomenon in SID05 Symposium. P mirror shows a moderate peak curve.…”

Projection optical system for a compact rear projector

“…In order to realize a more-compact rear projector, we tried to further enlarge the field angle of refractive-reflective optics. 3,4 2…”