Projection lens unit

Details Projection lens unit Projection lens unit

1995-11-13

1997-07-29

Ben, Loha

Optical: systems and elements

Lens

With support

359811, 359827, 359820, 359513, G02B 702

Patent

active

056526806

ABSTRACT:
In the optical coupling system where the space between projection lens and CRT is connected with a liquid, this invention aims to offer a projection lens unit wherein the angle of CRT relative to the optical axis of projection lens (tilt angle) may be changed by quite a simple operation; thereby the CRT tilt angle can be reset to an optimum when the angle of projection oblique to a screen shifts. Namely, a first housing and a second housing in which an optical coupling liquid is contained and sealed are coupled together with an watertight structure like a piston and cylinder and fixed, and a ring cam for regulating the relative space and tilt is held between the two housings; by fastening the two housings together with bolts, etc. the two housings can be set at a desired relative positioning.

REFERENCES:
patent: 4740058 (1988-04-01), Hori et al.
patent: 4948226 (1990-08-01), Ozaki
patent: 5157554 (1992-10-01), Kashihara
patent: 5202706 (1993-04-01), Hasegawa
patent: 5272540 (1993-12-01), Hirata et al.
patent: 5305145 (1994-04-01), Tanaka
patent: 5446591 (1995-08-01), Medlock

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