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, 1976
Filed:
Apr. 04, 1975
Kazuo Tanaka, Tokyo, JA;
Youichi Okuno, Kanagawa, JA;
Kazuya Matsumoto, Kanagawa, JA;
Aiichiro Koyama, Kanagawa, JA;
Tomoaki Kawamura, Kanagawa, JA;
Takehiko Kiyohara, Kanagawa, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
An optical system for a television camera provided with a device for emitting bias-light which is directed to the image pickup tube. Rays of light coming from a light source and entering a light guide plate at a side edge thereof are guided through the interior of the plate toward the opposite side edge after a number of successive total internal reflections from the two boundary surfaces of the plate. The surface of the plate near to the image pickup tube is provided with a diffraction grating formed therein to diffract a fraction of the light rays entering the plate, and to direct it toward the image pickup tube, thereby the image pickup tube is illuminated by the diffracted rays of light.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile