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:
Aug. 30, 1988
Filed:
Jan. 23, 1987
Applicant:
Inventor:
Charles W Reno, Cherry Hill, NJ (US);
Assignee:
General Electric Company, Camden, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G02B / ;
U.S. Cl.
CPC ...
369112 ; 369 54 ; 369 55 ; 369122 ; 350 64 ;
Abstract
A multi-beam optical recording system includes a semiconductor laser array. The laser beams are expanded via a prism beam expander to have generally circular cross-sections for optimum spot intensity on the recording medium. According to the teaching of the prior art, the average beam angle of incidence on the input prism of the beam expander is the Brewster angle. According to the present invention, means are provided for rotating the beam expander to minimize the variations in spacing between beams, these variations resulting from the magnification distortion of the prisms of the beam expander.