Projection tv set apparatus

Details Projection tv set apparatus Projection tv set apparatus

1997-03-24

1998-03-24

Ben, Loha

Optical: systems and elements

Lens

With support

359823, 359649, 348745, G02B 702

Patent

active

057319170

ABSTRACT:
A lens device which is applied to a projection type image display apparatus includes an outer tube and an inner tube forming a tube structure having an optical lens and a thermal react material such as bimetallic sheet disposed between the outer tube and the inner-tube. Lens focus is corrected by moving a relative position between the outer tube and the inner tube in an optical axis direction to thereby maintain an initially set focus position to obtain an image of high picture quality.

REFERENCES:
patent: 4525745 (1985-06-01), Ghaem-Maghami et al.
patent: 5157554 (1992-10-01), Kashihara
patent: 5652680 (1997-07-01), Kashihara et al.

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