发明授权
- 专利标题: Apparatus using an optical pickup
- 专利标题(中): 使用光学拾取器的装置
-
申请号: US384843申请日: 1995-02-07
-
公开(公告)号: US5566142A公开(公告)日: 1996-10-15
- 发明人: Junichi Nakano , Nobuo Miyairi , Shohei Kobayashi , Akihiko Yoshizawa
- 申请人: Junichi Nakano , Nobuo Miyairi , Shohei Kobayashi , Akihiko Yoshizawa
- 申请人地址: JPX Tokyo
- 专利权人: Olympus Optical Co., Ltd.
- 当前专利权人: Olympus Optical Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX6-016658 19940210; JPX6-083206 19940421
- 主分类号: G11B7/12
- IPC分类号: G11B7/12 ; G11B7/125 ; G11B7/13 ; G11B7/00
摘要:
The present invention is directed to an apparatus using an integrated type pickup as an optical head for writing and reading optical information and capabling of writing data at high speeds. The apparatus includes a laser diode having an active layer at its intermediate position and having one area side held over a surface of a semiconductor substrate with an insulating layer interposed between the semiconductor substrate and the laser diode relative to the active layer. The laser diode has two areas with the active layer as a boundary and a constant potential is applied from a power supply to the insulating layer side of the laser diode and a transistor (laser diode drive unit) is provided to apply a modulation signal to the other area of the laser diode so that the laser diode is driven to modulate its output. By doing so, a constant potential is maintained at the semiconductor substrate and at the insulating layer's side of the laser diode and the modulation signal is applied to the other area side of the laser diode. When a drive current of the laser diode is varied by the modulation signal, a voltage variation occurs only on the other area side of the laser diode so that a high-frequency drive current, if flowing through the insulating layer side, is small and hence the laser diode has its output to be modulated effectively.
公开/授权文献
- US4912793A Dry cleaning method and apparatus 公开/授权日:1990-04-03