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:
Feb. 27, 1990
Filed:
Jan. 20, 1988
Applicant:
Inventor:
Wai-Hon Lee, Cupertino, CA (US);
Assignee:
Pencom International Corporation, Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369112 ; 350320 ;
Abstract
A method for constructing an optical head having a holographic diffraction grating for focusing a light beam on a photodetector is disclosed. The photodetector is first mounted in the optical head and the distance between the position where the hologram lens will be placed and the photodetector is measured. The holographic grating pattern which is etched onto the hologram leans is then created so that it will focus the laser beam at the measured distance. The hologram lens is then mounted in the optical head.