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:
May. 18, 1993
Filed:
Jun. 06, 1991
Chiaki Sato, Hachioji, JP;
Eishi Ikuta, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A laser beam emitted from a laser diode 12 is converted to parallel beams through a collimator lens 14. The beams pass through a stop 15, a polarizing beam splitter 16 and a .lambda./4 plate 18. The beams are then converged on an optical disc 22 through an objective lens 20 and diffracted by mark set provided on the disc 22. The diffracted beams reflected by the disc 22 enter the objective lens 20, pass through the .lambda./4 plate 18, are reflected by the polarizing beam splitter 16, and are divided into two parts by a half mirror 24. The reflected part of the beams enters a data reproducing detector 26, and the transmitted part of the beams enters a tracking servo detector 27.