Title:
AUTOMATIC FOCUS ADJUSTING DEVICE
Document Type and Number:
Japanese Patent JPS5414733
Kind Code:
A
Abstract:
A method and apparatus for automatically focusing a camera is described in which the camera has a stationary optical path and a scanning optical path for developing focusing signals. The scanning optical path is caused to undergo a range-finding reciprocation in which it reciprocates between first and second limit positions, as between the minimum lens focusing position and the infinite lens focusing position. Two focusing signals are generated during the range-finding reciprocation and the interval between the focusing signals is used to derive the distance to the subject. The lens is then positioned in accordance with the derived distance to the subject.
Inventors:
OOSAWA NORIAKI
Application Number:
JP8000877A
Publication Date:
February 03, 1979
Filing Date:
July 06, 1977
Export Citation:
Assignee:
BELL & HOWELL JAPAN
International Classes:
G02B7/30; G03B13/36; (IPC1-7): G02B7/11; G03B3/00; H04N5/26