Title:
【発明の名称】オートフォーカス装置のモータ制御回路
Document Type and Number:
Japanese Patent JP3024164
Kind Code:
B2
Abstract:
A motor control circuit for an autofocus unit which microsteps a stepping motor to turn a rotor and drive a focus lens, which circuit has a memory (4, 5) which stores data on current values of a plurality of phases at rotation stopping positions of the rotor, a drive circuit (6, 7) which energizes the phases based on the current data output by the memory (4, 5), and an address generator (3) which reads out the current data of the memory (4, 5), the address generator (3) generating an address which makes an inclination of a path of a rotational angle with respect to a time axis smoother at a switching point of direction of rotation of the rotor, whereby the wobbling of the focus lens becomes gentler and the vibration and audio noise can be reduced.
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Inventors:
Shigehisa Maruyama
Application Number:
JP9859290A
Publication Date:
March 21, 2000
Filing Date:
April 13, 1990
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G03B13/36; G02B7/08; G02B7/09; G02B7/10; H02P8/22; (IPC1-7): H02P8/22; G02B7/08; G02B7/09; G03B13/36
Domestic Patent References:
| JP2211096A | ||||
| JP2208615A | ||||
| JP1129797A |
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)