Title:
レンズ制御装置
Document Type and Number:
Japanese Patent JP4383559
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To decide an absolute position in a short time and to quickly perform optional operation even after supplying power by temporarily deciding the absolute position by using an absolute position detection means after supplying the power to a lens and correcting endpoint data in the midst of ordinary action. SOLUTION: Immediately after supplying the power, the inside of a CPU is initialized and a positioning flag and a speed setting flag are cleared (S1). The voltage of a potentiometer being the absolute position detection means is A/D converted and the converted result is set in a counter as an initial value (S2). Then, initializing action is finished and shifted to the ordinary action to control the lens in accordance with output from a zoom demand. If the endpoint signal is outputted (S4), the lens speed at the time of detecting the endpoint is obtained and set in driving speed data V (S5). Once the endpoint is detected, the lens is controlled according to the reference signal of the endpoint position instead of the reference signal of the potentiometer.
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Inventors:
Kenichi Kubo
Application Number:
JP21045898A
Publication Date:
December 16, 2009
Filing Date:
July 09, 1998
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B7/08; H04N5/232
Domestic Patent References:
| JP4204705A | ||||
| JP3249630A | ||||
| JP7199034A | ||||
| JP5005822A | ||||
| JP6062296A | ||||
| JP1224715A | ||||
| JP7128618A |
Attorney, Agent or Firm:
Yasuhiko Hibiya