Photography – Having variable focal length of camera objective – Power zoom
Patent
1996-12-30
1999-05-25
Adams, Russell
Photography
Having variable focal length of camera objective
Power zoom
396205, G03B 1700
Patent
active
059077255
ABSTRACT:
A position detection system detects a position of a lens of a camera using a code plate provided with a plurality of electrodes arranged to form a plurality of patterns. The ends of the electrodes are respectively connected to a connecting point of a plurality of resistors connected in series, and a predetermined voltage is applied across the resistors. A conductive brush is provided such that, depending on the position of the lens, two of the electrodes are electrically connected by the brush, which short-circuits at least one of the plurality of resistors. Be detecting voltage at one of the connecting points of the resistors, which varies depending upon which resistor is short-circuited, the lens position is determined.
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Azegami Kazuyoshi
Kishimoto Masaaki
Nomura Hiroshi
Numako Norio
Sasaki Takamitsu
Adams Russell
Asahi Kogaku Kogyo Kabushiki Kaisha
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