Title:
CAMERA
Document Type and Number:
Japanese Patent JPH1152223
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a camera capable of preventing reduction in the stopping accuracy of a focusing optical system, without changing a previously set parameter, even if a mechanical property is changed because of an error in production. SOLUTION: Focusing is executed in such a manner that the focusing optical system in a photographic lens is moved in an optical axial direction by the driving of a motor and this motor is driven by a focusing drive control circuit 9. A storage circuit 16 with nonvolatile memory is stored with load fluctuation predicting data with respect to the temp. of the camera. The temp. of the camera is detected by a temperature sensor circuit 15 and the load fluctuation predicting data corresponding to the detected value in the temp. is read out from the storage circuit 16, so that the ON time of PWM(pulse width modulation) control with respect to the motor of a focusing mechanism is calculated on the basis of the read out data.
Inventors:
YOSHII HIROSHI
Application Number:
JP21830697A
Publication Date:
February 26, 1999
Filing Date:
July 30, 1997
Export Citation:
Assignee:
CANON KK
International Classes:
G03B13/36; G02B7/28; (IPC1-7): G02B7/28; G03B13/36
Attorney, Agent or Firm:
Takaharu Takita