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:
Apr. 01, 2003
Filed:
Oct. 24, 2000
Daisuke Matsuo, Kodaira, JP;
Nobuyoshi Iwasaki, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A magneto-optical pickup includes a light source for emitting a light beam, the light beam traveling to an information recording medium along a first optical path, a first light receiving element group for detecting an error signal, a second light receiving element group for detecting a magneto-optical signal, the first and second light receiving element groups being situated substantially on one plane, a diffraction grating for diffracting light returned along the first optical path from the information storage medium, the diffracted light being directed toward the first light receiving element group, a polarization beam splitter for separating a part of the return light from the information storage medium, a beam of the separated part of return light traveling to the second light receiving element group along a second optical path, a mirror for bending the second optical path, the light beam reflected thereby being directed toward the second light receiving element group, and an anisotropic optical crystal member having an optic axis inclined to the optical axis at an angle within the range between 30° and 60°, the crystal member including a parallel flat plate portion, which is between the mirror for bending the second optical path and the first light receiving element group.