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:
Sep. 28, 2004
Filed:
Sep. 20, 2001
Takehiro Motegi, Saitama, JP;
Shinichi Takahashi, Saitama, JP;
Mitsutoshi Sugano, Saitama, JP;
Ko Ishii, Saitama, JP;
Makoto Kawamura, Saitama, JP;
Yoshihiro Seita, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A reflective mirror is inclined and placed with respect to an objective lens and a photoelectric conversion element for monitor is placed in the back side of the reflective mirror . The reflective mirror is formed into a structure in which a semi-transmission film HM having predetermined reflectance and transmittance is formed on one surface of a substrate of a transparent medium. When a laser beam for information record or information reproduction is launched from semiconductor lasers to the reflective mirror , the semi-transmission film HM splits the laser beam into a reflected beam and a transmitted beam and the reflected beam is emitted to the side of the objective lens and the transmitted beam is emitted to the side of the photoelectric conversion element . As a result of this, any laser beams for the information record and the information reproduction can be detected by one photoelectric conversion element to perform APC control of the semiconductor lasers and the intensity of the laser beam for the information record and the information reproduction with respect to an information record medium can be controlled properly.