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:
Oct. 23, 1990
Filed:
Jul. 12, 1988
Applicant:
Inventors:
Michihiro Tadokoro, Hyogo, JP;
Kazuo Okada, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369112 ; 369 4423 ;
Abstract
Provided is an optical recording and reproducing apparatus in which a collimator lens collimates divergent light fluxes from a light source to emit parallel light fluxes and then an objective lens converges the parallel light fluxes onto an information carrier. The collimator lens comprises a first lens having a first predetermined focal distance and a second lens having a second predetermined focal distance which is longer than the first predetermined focal distance. The second lens can be moved in the optical-axis direction so as to adjust the relative position of the collimator lens and the light source.