Optical: systems and elements – Lens – With variable magnification
Patent
1992-06-25
1994-04-05
Ben, Loha
Optical: systems and elements
Lens
With variable magnification
359823, 354400, 2502012, G02B 1514, G02B 702
Patent
active
053010663
ABSTRACT:
A lens barrel of the present invention directly detects the lens-to-lens spacing between a focusing lens and another lens, whose position relative to the focusing lens exerts the largest influence upon a focused condition, by a measurement detector and, depending on an output indicative of the measured spacing, a controller drives the focusing lens through a driver to a proper in-focus condition. Accordingly, a very valuable advantage results in that a focusing position error of the focusing lens group, which has been encountered in the prior art, can be avoided to enable effective and high-accuracy focusing operation and control through a simplified structure.
REFERENCES:
patent: 4750821 (1988-06-01), Yamamoto et al.
patent: 5039202 (1991-08-01), Koyama et al.
patent: 5078472 (1992-01-01), Sugawara
Higuchi Masayu
Ito Takeshi
Terada Hiroshi
Torikoshi Yuichi
Ben Loha
Olympus Optical Co,. Ltd.
Weinstein Louis
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