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. 05, 1996
Filed:
Nov. 15, 1994
Applicant:
Inventors:
Tomoyoshi Ikeya, Yamanashi-ken, JP;
Mitsuru Itamochi, Yamanashi-ken, JP;
Hidetoshi Yokosawa, Yamanashi-ken, JP;
Assignees:
Pioneer Electronic Corporation, Tokyo, JP;
Pioneer Video Corporation, Yamanashi-ken, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 99 ; 369112 ; 369116 ; 369118 ;
Abstract
An optical reproducing system has a first optical path from a light source to an optical disc, and a second optical path from the optical disc to a photodetector. An objective lens is provided in the first optical path for forming an a non-collimated beam applied to the optical disc. A profile conversion filter having an angle dependent transmittance characteristic is provided between the objective lens and the optical disc.