发明授权
US06418107B1 Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same
有权
光头装置,使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
- 专利标题: Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same
- 专利标题(中): 光头装置,使用该装置的倾斜检测装置以及使用该装置的光信息处理装置
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申请号: US09641813申请日: 2000-08-17
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公开(公告)号: US06418107B1公开(公告)日: 2002-07-09
- 发明人: Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
- 申请人: Kousei Sano , Shin-ichi Kadowaki , Hiroaki Yamamoto , Ken'ichi Kasazumi , Seiji Nishino
- 优先权: JP8-156546 19960618; JP8-159368 19960620; JP8-161331 19960621
- 主分类号: G11B700
- IPC分类号: G11B700
摘要:
An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.