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:
Nov. 28, 2000
Filed:
Jun. 02, 1998
Motomichi Shibano, Kawasaki, JP;
Shinya Hasegawa, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical pickup for writing/reading a magneto-optical signal recorded in a magneto-optical recording medium is provided, which reduces the size, integrates the functions and improves the mounting efficiency of a magneto-optical signal detection mechanism. The optical pickup comprises a semiconductor laser, a hologram for transmitting and diffracting the light emitted from the semiconductor laser, a collimator lens for condensing the light emitted from the semiconductor laser, an objective lens for condensing the laser light on an optical recording medium, a composite device interposed between the collimator lens and the objective lens, and photo-detectors for detecting an optical signal. The composite device 10 includes a polarization beam splitter 11, a condensation device 12, a reflector and a polarizer/splitter 14 integrated with each other. A photo-detector for detecting a servo signal and a photo-detector for detecting a magneto-optical signal are fabricated on a single substrate.