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:
Jun. 13, 1995
Filed:
Jul. 07, 1994
Takao Rokutan, Higashimurayama, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An optical information recording/reproducing apparatus for performing tracking servo and at least one of recording and reproducing information by irradiating a recording medium having a plurality of guide tracks and a plurality of information tracks with a light spot and by generating a track error signal from reflected light of the light spot. The apparatus includes a photo-detecting device having a detection portion composed of a plurality of light receiving portions which are disposed in a two-dimensional array, the detection portion receiving formed spot of light reflected by the recording medium so as to output a signal, an addition device for selecting a region having an arrangement of the plurality of light receiving portions in a line or column direction in the detection portion of the photo-detecting device and for adding together outputs from the arrangement of the light receiving portions in the selected regions, a binary coding device for binary-coding output from the addition device, an address detection device for detecting the position of an address which corresponds to the position of at least one guide tracks on the basis of output from the binary cording device, and a track error generating device for generating a track error signal on the basis of the output from the address detection device.