Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-04-23
1992-09-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359698, 354402, G03B 300, G01J 120
Patent
active
051460718
ABSTRACT:
A plurality of lens groups are moveable in the direction of an optical axis. A plurality of motors are provided for the lens groups, respectively. A driving circuit drives the motors. A switching section sequentially selects the motors and connects the selected motors to the driving circuit. A lens position-detecting section detects the positions of the lens groups. A driving control section sequentially drives the lens groups in accordance with intermediate target position data, respectively, via the switching section and the driving section, and determines whether the lens groups have reached their respective intermediate target positions, on the basis of the detection performed by the lens position-detecting section. When the driving control section determines that the lens groups have reached their respective intermediate target positions, it demands next intermediate target positions, which are slightly away from the initially-determined intermediate target positions. On the basis of the next intermediate target positions, the lens groups are driven again. With this operation repeated, the driving control section controls the driving of the lens groups until these lens groups reach their respective final target positions.
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Kato Shigeru
Kodama Shinichi
Miyasaka Tetsuo
Odanaka Yasushi
Ookubo Mitsumasa
Messinger Michael
Nelms David C.
Olympus Optical Co,. Ltd.
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