The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 1982
Filed:
Jan. 31, 1980
Applicant:
Inventors:
Harumi Aoki, Kiyose, JP;
Yoshio Sawada, Tokyo, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 25 ; 354 / ;
Abstract
An automatic focus indicating device especially adapted for use with a single lens reflex camera in which a contrast signal is produced by scanning the image of an object being viewed through the photographing lens of the camera. This signal is converted into an indication signal which may be either an audio or a visual signal. As the lens is moved to positions near the focus point, the indicating device is activated to a first mode. As the lens is set precisely upon the point of focus, the indicating device operates in a second mode. In this manner, the camera is well adapted for both hand-held and fixed position usage.