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:
Sep. 04, 2001
Filed:
May. 26, 1998
Hiroaki Shimozono, Tokyo, JP;
Asahi Glass Company Ltd., Tokyo, JP;
Abstract
An optical device for recording or reading two optical disks,in which the thickness of a transparent substrate of a first optical disk,is different from the thickness of a transparent substrate of a second optical disk,wherein the optical device has an objective lens,for collecting light from a first light source,and light from a second light source,onto data recording surfaces,by means of respective transparent substrates,of the optical disks,; an optical material,for forwarding the light from the first light surface,and the light from the second light source,and light from a second light source,before the lights reaches the objective lens,, and an auxiliary lens,provided between the second light surface,and the optical material