Image projection apparatus

Details Image projection apparatus Image projection apparatus

1991-09-24

1993-02-02

Lee, John D.

Optical: systems and elements

Polarization without modulation

359496, G02B 530, G02B 2728

Patent

active

051842483

ABSTRACT:
An image projection apparatus is described, which comprises an illumination system (100, 101, 54, 57, 62) having a first, round lens plate (54) and a second, half-round lens plate (57). A combination of a special polarization-sensitive beam splitter (20) and a polarization rotator (31) is arranged in the path of the beam supplied by this system and converts the beam into two sub-beams having the same state of polarization which jointly illuminate a display panel (1) in a uniform manner and optimally fill the surface area of this panel and a subsequent projection lens system (C).

REFERENCES:
patent: 3612652 (1971-10-01), Habeggar
patent: 3998524 (1976-12-01), Hubby et al.
patent: 4127322 (1978-11-01), Jacobson
patent: 4239346 (1980-12-01), Lloyd
patent: 4722593 (1988-02-01), Shimazaki

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