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:
Nov. 20, 1990
Filed:
Dec. 14, 1989
Yoshinobu Shibayama, Kanagawa, JP;
Toyotoshi Suzuki, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A device for determining whether a film leader is inside or outside a camera housing includes a light emitting device, a light detection device, and a control circuit. The light emitting device is disposed on one side of the film and emits signal light. The light detection device is disposed on the same side of the film and detects when the signal light is blocked by two separate portions of the film. The light detection device also detects when the signal light is not blocked by the two film portions. The two film portions are separated from each other by predetermined distance. The control means emits a control signal when the light detection device detects the signal light, thus indicating that the film leader is inside the camera housing.