Title:
AUTOMATIC FOCUSING CAMERA
Document Type and Number:
Japanese Patent JPH01128022
Kind Code:
A
Abstract:
PURPOSE:To accurately and easily correct the error of a lens moving mechanism system and a focusing caused by an environmental change by correcting the revolution quantity of a motor with a bias according to a focusing error caused by the mobile mechanism of a focusing lens or the environmental change. CONSTITUTION:An bias correcting means is the moving control system of the focusing lens control motor 27 by a microcomputer CPU according to the signal of measurement of distance from a focusing unit and is for a means to correct a mechanical play, a deformation and moreover an assembling error existing in the mechanical system from the control motor 27 to the focusing lens, the camera is provided with the above-mentioned bias correcting means by which a microcomputer CPU corrects the revolution quantity of the motor 27 with a bias voltage to set a volume VR. And the portion equal to an error of the mobile mechanism is corrected by the bias correction of the revolution control quantity of the motor 27 by every camera. Thus, the error of the mobile mechanical system of the focusing lens or the dispersion of the focusing position caused by the environmental change is accurately and easily corrected.
Inventors:
AKASAKA MICHIHARU
NAKAYAMA HARUKI
NAKAYAMA HARUKI
Application Number:
JP28687987A
Publication Date:
May 19, 1989
Filing Date:
November 13, 1987
Export Citation:
Assignee:
KONISHIROKU PHOTO IND
International Classes:
G02B7/09; G03B3/00; G03B13/36; (IPC1-7): G02B7/11; G03B3/00
Attorney, Agent or Firm:
Akihiro Ota