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:
Jul. 21, 1992
Filed:
Sep. 27, 1990
Sou Ishika, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An optical head in use with an optomagnetic disk apparatus employs a polarized beam splitter when information is recorded on and read out from a recording medium. In the optical head according to the present invention, the polarization plane of the polarized beam splitter is arranged so that it makes an angle of substantially 45.degree. with the polarization angle of the polarized laser beam entering the polarized beam splitter, whereby the optical head according to this invention does not use a 1/2 wavelength plate which is indispensable to the conventional optical head. In addition, the assembly and adjustment of the optical head according to the present invention are simplified.