Projector including an illumination device with a light...

Details Projector including an illumination device with a light... Projector including an illumination device with a light...

2006-01-10

2009-02-24

Nguyen, Hung Henry (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S098000

Reexamination Certificate

active

07494225

ABSTRACT:
A projector includes an illumination device, an electro-optic modulator, a projection optical system, a light source device having an ellipsoidal reflector, a light emitting tube, a collimator lens, a first lens array having plural first small lenses for dividing an illumination beam emitted from the light source device into plural partial beams, and a second lens array having plural second small lenses corresponding to the plural first small lenses of the first lens array. The light illumination device also includes a light cut-off member arranged in a position which is optically conjugate with the plural first small lenses and the elector-optic modulator between the illumination device and the electro-optic modulator, and has a predetermined opening part for adjusting the sectional shape of the illumination beam. The light illumination device further provides a rotating prism, which is arranged on the electro-optic modulator side of the light cut-off member, and scans the illumination beam from the light cut-off member, in synchronization with a frame rate of the electro-optic modulator.

REFERENCES:
patent: 5528318 (1996-06-01), Janssen
patent: 5865521 (1999-02-01), Hashizume et al.
patent: 6755538 (2004-06-01), Sugawara
patent: 2004/0257812 (2004-12-01), Fujisawa
patent: 2006/0007521 (2006-01-01), Akiyama
patent: 2006/0164601 (2006-07-01), Akiyama
patent: A 2002-148712 (2002-05-01), None
Taiichiro Kurita, “Picture Quality of Hold Type Display for Moving Images”, Technical Report of IEICE, EID99-10, pp. 55-60, with translations.

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