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:
Dec. 27, 1983
Filed:
Dec. 16, 1981
Masanori Uchidoi, Kanagawa, JP;
Kazunobu Urushihara, Tokyo, JP;
Canon Kabushiki Kaisha, , US;
Abstract
In the exposure time control device disclosed, a first timer sets a first time interval equal to a desired exposure time but establishes an exposure time in the shutter different from the desired exposure time. A second timing arrangement forms a compensation time interval. Suitable means maintain the opening of the shutter for a total time equal to the given time interval and the compensation time interval so that the shutter is open for the desired exposure time. A control shortens the given time interval formed by the first timing arrangement by a predetermined time interval so that the given time interval formed is shorter than the desired exposure time. This permits compensation not only for errors which tend to shorten the exposure time, but also those which tend to lengthen the exposure time.