Device for positioning the cathode ray tubes in a projection tel

Details Device for positioning the cathode ray tubes in a projection tel Device for positioning the cathode ray tubes in a projection tel

1992-12-16

1994-03-29

Groody, James J.

Television

Video display

Projection device

348826, 348827, H04N 5645, H04N 5655, H04N 574

Patent

active

052989844

ABSTRACT:
A cathode ray tube device employed in a projection apparatus for projecting an image on a screen. The cathode ray tube device includes a supporting frame mounted on a rim of a front panel section of the cathode ray tube, a lens plate in the form of a frame having a center aperture, and having a projection lens system attached to it, and a positioning supporting member detachably mounted on a mounting base plate of the projection apparatus and adapted for positioning the supporting frame and the lens plate with respect to the mounting base plate for detachably supporting the supporting frame and the lens plate by the mounting base plate. The positioning supporting member has a lens plate supporting surface for supporting the lens plate at a tilt angle corresponding to a convergence angle with respect to the mounting base plate and a supporting frame supporting surface for positioning and supporting the supporting frame at a tilt angle corresponding to an elevation with respect to the lens plate and at a distance corresponding to a back focal length at back of the lens plate for accurately setting the convergence angle, elevation and the back focal length.

REFERENCES:
patent: 2948891 (1957-06-01), Smith
patent: 3969648 (1976-07-01), Hergenrother et al.
patent: 4388642 (1983-06-01), Reno, Jr. et al.
patent: 4400723 (1983-08-01), Fanizza et al.
patent: 4404588 (1983-09-01), Fanizza et al.
patent: 4621293 (1986-11-01), Matis
patent: 5045930 (1991-09-01), Hasegawa

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