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. 23, 1989
Filed:
Oct. 15, 1987
Applicant:
Inventors:
Mamoru Miyawaki, Tokyo, JP;
Uuichi Handa, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9611 ; 350 9613 ; 350 9614 ;
Abstract
In a waveguide optical system having a light waveguide, a light coupler for receiving and directing a light beam propagated through the light waveguide to a condensing lens for condensing the light beam emerging from the light coupler into the form of a spot, the coupling length of the light coupler is set so that the shape of the spot is substantially circular, whereby the waveguide optical system is made suitable for use with a high-density recording optical head or the like.