Optical: systems and elements – Lens – With support
Patent
1995-03-03
1997-04-01
Sugarman, Scott J.
Optical: systems and elements
Lens
With support
359823, G02B 702
Patent
active
056172591
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.
Maioli Jay H.
Sony Corporation
Sugarman Scott J.
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