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:
Jul. 26, 2005
Filed:
May. 14, 2003
Applicants:
Junji Hashimura, Sakai, JP;
Kyu Takada, Otsu, JP;
Inventors:
Junji Hashimura, Sakai, JP;
Kyu Takada, Otsu, JP;
Assignee:
Minolta Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B021/02 ; G02B013/18 ;
U.S. Cl.
CPC ...
Abstract
An objective lens system for optical pickups reading and/or writing information by condensing a luminous flux from a light source onto an optical information recording medium, consists of, a single lens having, from a light source side, a first surface convex to the light source side and a second surface convex to an image side. A medium of the single lens is a homogeneous medium. At least one of the two surfaces is aspherical. The system satisfies the predetermined conditions.