Temperature compensation for TV projection lens and CRT assembly

Details Temperature compensation for TV projection lens and CRT assembly Temperature compensation for TV projection lens and CRT assembly

1982-10-22

1985-06-25

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 64, 350253, 352140, 353101, 355 44, H04N 574, G02B 702

Patent

active

045257450

ABSTRACT:
Projection TV systems comprise plactic lens and CRT assemblies arranged to project an image onto a screen for viewing. The focus of the lens varies with ambient temperature around the lens as the temperature increases from turn-on of the projection TV system to a warmed-up condition of the system. There is disclosed a temperature compensating mechanism for the lens. The mechanism may be incorporated into the lens to cause direct axial movement of a lens element or it may be attached to an external focussing adjustment of the lens. Several embodiments of the mechanism are disclosed employing either a bimetal or a piston slidable in a cylinder with the cylinder being filled with a material that expands with temperature. The piston and cylinder assembly is used in the preferred embodiment with the cylinder housing attached to the lens housing and the piston directly connected to the external focussing adjustment of the lens.

REFERENCES:
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patent: 4234894 (1980-11-01), Tokumaru
patent: 4300817 (1981-11-01), Betensky

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