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. 13, 2005
Filed:
May. 11, 2000
Applicant:
Eiji Yamada, Tenri, JP;
Inventor:
Eiji Yamada, Tenri, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B009/00 ;
U.S. Cl.
CPC ...
Abstract
An optical recording/reproducing apparatus is intended for a recording medium having at least two information recording layers. The apparatus has at least two lenses, a first lens and a second lens, for condensing a light beam to irradiate an information recording layer. The at least two lenses are designed such that a light beam condensed by these lenses upon an information recording layer closest to these lenses has a minimum spherical aberration.
Yamada, Eiji. (2005). Optical recording/reproducing apparatus for multi-layer recording media that alleviates adverse effect of spherical aberration beyond compensation by changing the numerical aperture of combined lenses (U.S. Patent No. 6974939). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6974939
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile