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:
Feb. 23, 1993
Filed:
Sep. 11, 1990
Nobuo Ogata, Tenri, JP;
Tetsuo Ueyama, Nara, JP;
Yoshihiro Sekimoto, Nara, JP;
Toshiyuki Tanaka, Moriguchi, JP;
Hideaki Sato, Yamato-Koriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An optical head, for an optical disk recording/reproducing apparatus, for irradiating a recording medium by a light beam emitted from a light source and introducing an information light formed by a light beam reflected from the recording medium to a photo detector, a shift of an optical axis of the information light being minimized. The optical head includes a unit for receiving the information light which is reflected from the recording medium, a first reflecting unit for reflecting such information light, a second reflecting unit for reflecting the information light reflected by the first reflecting unit and for directing the reflected information light toward the photo detecting system, and a unit for emerging the information light reflected by the second reflecting unit to the photo detecting system. The first reflecting unit has a surface for reflecting the information light thereby, and the second reflecting unit also has a surface for reflecting the reflected information light from the surface of the first reflecting unit. The surface of the first reflecting unit is substantially parallel to the surface of the second reflecting unit. The emerging surface has a surface from which the information light reflected by the surface of the second reflecting unit emerges. An angle between the surface of the receiving unit and the surface of the first reflecting unit is substantially equal to an angle between the surface of the second reflecting unit and the surface of the emerging unit.