Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-01-14
1994-01-25
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359698, 354402, G01J 120, G03B 300
Patent
active
052817962
ABSTRACT:
An optical equipment comprises: a first lens for focusing and compensation for magnification variation; a second lens for magnification variation; position detection means for detecting positions of the first lens and the second lens; focus detection means for detecting a focus status; lens drive means for driving the first lens and the second lens; and control means for controlling the lens drive means in accordance with information from the position detection means and the focus detection means. The control means determines a drive range of the first lens in which a circle of confusion may be zero, in accordance with focal length information, and inhibits the first lens from being driven out of the range during the magnification variation of the second lens.
REFERENCES:
patent: 4697891 (1987-10-01), Kawai
patent: 4735494 (1988-04-01), Makino et al.
patent: 4881799 (1989-11-01), Ohno et al.
patent: 4976523 (1990-12-01), Ishikawa
patent: 5060001 (1991-10-01), Kaneda
patent: 5067802 (1991-11-01), Orino
Hirasawa Masahide
Kaneda Kitahiro
Kaneda Naoya
Niida Mitsuo
Yamada Kunihiko
Canon Kabushiki Kaisha
Messinger Michael
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