发明授权
- 专利标题: Information reproducing apparatus with plural beam readout
- 专利标题(中): 具有多个光束读出的信息再现装置
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申请号: US691099申请日: 1976-05-28
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公开(公告)号: US4085423A公开(公告)日: 1978-04-18
- 发明人: Yoshito Tsunoda , Takeshi Maeda , Yoshitada Oshida
- 申请人: Yoshito Tsunoda , Takeshi Maeda , Yoshitada Oshida
- 申请人地址: JA
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JA
- 优先权: JA50-67643 19750606
- 主分类号: H04N5/85
- IPC分类号: H04N5/85 ; G02B27/00 ; G02B27/09 ; G11B7/00 ; G11B7/005 ; G11B7/09 ; G11B7/12
摘要:
Information reproducing apparatus for producing information on an optical information recording medium includes a first light source which gives forth a beam of light of a wavelength .lambda..sub.1 and a second light source which gives forth a beam of light of a wavelength .lambda..sub.2 different from the wavelength .lambda..sub.1. An optical element selectively reflects the light of the wavelength .lambda..sub.1 and selectively transmits the light of the wavelength .lambda..sub.2. The first and second light sources, the optical element and the recording medium are positionally arranged so that the light beams from the first and second light sources may be projected on a predetermined position of the recording medium and a substantially identical position to the predetermined position through the optical element, respectively, and the arrangement of these elements is also such that the respective projected light beams may fall on the optical element after being reflected by the recording medium. First and second photodetectors detect light reflected from the optical element and light transmitted light through the same in accordance with the wavelength of the light beams falling on the optical element, respectively, and develop focusing and tracking control signals.
公开/授权文献
- USD346330S Bottle 公开/授权日:1994-04-26