发明授权
- 专利标题: Method for detecting the movement of a light beam and optical information reproduction apparatus using the same
- 专利标题(中): 用于检测光束的移动的方法和使用其的光学信息再现装置
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申请号: US512190申请日: 1995-08-07
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公开(公告)号: US5671200A公开(公告)日: 1997-09-23
- 发明人: Osamu Yamaguchi , Mitsuro Moriya , Hiroyuki Yamaguchi , Yoshihiro Kanda , Hiromichi Ishibashi
- 申请人: Osamu Yamaguchi , Mitsuro Moriya , Hiroyuki Yamaguchi , Yoshihiro Kanda , Hiromichi Ishibashi
- 申请人地址: JPX Kadoma
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JPX Kadoma
- 优先权: JPX6-190777 19940812
- 主分类号: G11B7/085
- IPC分类号: G11B7/085 ; G11B7/09 ; G11B19/20
摘要:
An optical information reproduction apparatus for reproducing information from a disc having a plurality of tracks storing the information in the form of pits includes a radiation device for radiating a light beam toward the disc to form a light spot on the disc; a moving device for moving the radiation device to move the light spot in a direction crossing the plurality of tracks in a radial direction of the disc; a photodetector having a detecting plane for receiving the light beam reflected by the disc, the detecting plane being divided into four detection areas at least in a direction parallel to a tangent of the tracks and in a direction perpendicular to the tangent of the tracks, the four detection areas generating light intensity signals corresponding to the intensities of the light beam which is received; a positional offset detector for detecting a positional offset of the light spot with respect to one of the tracks based on the light intensity signals generated by the photodetector and outputting the detection result as a positional offset signal; a signal processor for performing processing of the light intensity signals including logic operation to obtain an operation signal; and a direction detector for detecting a direction in which the light spot moves with respect to a target track based on the positional offset signal and the operation signal during the movement of the light spot toward the target track.
公开/授权文献
- US5037019A Bicycle carrier and anti-theft locking device 公开/授权日:1991-08-06
信息查询
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