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:
Oct. 31, 2000
Filed:
Aug. 16, 1999
Applicant:
Inventor:
Sachio Hasushita, Saitama, JP;
Assignee:
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
396380 ;
Abstract
In a SLR camera having a diopter adjusting lens element movable along the optical axis, the movement of which causes a change in the apparent visual angle, there is provided a finder optical system including a field frame size varying mechanism for varying the size of the opening of the field frame, and an association mechanism for driving the field frame size varying mechanism so that the change in the apparent visual angle of the finder optical system is compensated when the diopter is varied by moving the diopter adjusting lens element.