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Title:
PROJECTION TYPE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/1992/022007
Kind Code:
A1
Abstract:
A projection type display device has means for modulating light depending upon image information, a projection lens system for projecting the modulated light onto the screen, and a focusing mechanism for adjusting the projection lens system to vary the focusing condition of the image on the screen. The focusing mechanism has a member for measuring the distance between the projection lens and the screen using invisible light, and an automatic adjusting member for bringing the focal point of the projection lens system to a desired position.

Inventors:
BABA HIROYUKI (JP)
Application Number:
PCT/JP1991/000740
Publication Date:
December 10, 1992
Filing Date:
May 31, 1991
Export Citation:
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Assignee:
SEIKO EPSON CORP (JP)
International Classes:
G02B7/09; G02B7/32; G03B3/00; G03B21/00; G03B21/53; G03B27/34; G09F19/18; H04N9/28; (IPC1-7): G02B7/09; G03B3/00; G03B21/00
Foreign References:
JPH01204010A1989-08-16
JPS5739032U1982-03-02
JPS61275615A1986-12-05
JPS61240108A1986-10-25
JPS6167012A1986-04-07
JPS60128314U1985-08-28
JPS60247631A1985-12-07
JPS4922189Y11974-06-14
JPS536046B21978-03-04
JPS5997123A1984-06-04
JPS57104918A1982-06-30
Other References:
See also references of EP 0541800A4
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