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1. 发明公开

EP1231603A1 PHOTOELECTRONIC DEVICE 审中-公开
标题翻译：光环网GERAET
公开(公告)号：EP1231603A1
公开(公告)日：2002-08-14
申请号：EP00974851.8
申请日：2000-11-08
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： TAKASUKA, Shoichi , IJIMA, Shin'ichi , NAKANISHI, Hideyuki , YOSHIKAWA, Akio
IPC分类号： G11B7/135 , G11B7/09 , H01L31/02
CPC分类号： G11B7/1263 , G11B7/0903 , G11B7/123 , G11B7/131 , G11B7/1353 , G11B7/1381 , G11B7/1395
摘要： An optoelectronic device that provides an excellent reproduction signal and a stable servo control while preventing deterioration of S/N ratio caused by stray light. The optoelectronic device has a semiconductor laser (101) that emits light beams on an information-recording medium (105), a hologram optical element (102) having a diffraction grating region (108) and located between the semiconductor laser (101) and the information-recording medium (105), and a photodetector (106) for receiving light that is diffracted at the diffraction grating region (108) of the hologram optical element (102), among returning light beams from the information-recording medium (105), and the optoelectronic device has also a diffraction grating region (107) in the vicinity of the diffraction grating region (108) of the hologram optical element (102) so as to prevent stray light other than diffracted light from the diffraction grating region (108) from entering the photodetector (106).
摘要翻译：提供优异的再现信号和稳定的伺服控制的光电子器件，同时防止由杂散光引起的S / N比的劣化。光电子器件具有在信息记录介质（105）上发射光束的半导体激光器（101），具有衍射光栅区域（108）并且位于半导体激光器（101）和信息记录介质（105）和用于接收来自信息记录介质（105）的返回光束中的在全息光学元件（102）的衍射光栅区域（108）衍射的光的光电检测器（106）并且光电子器件在全息光学元件（102）的衍射光栅区域（108）附近也具有衍射光栅区域（107），以便防止来自衍射光栅区域（108）的衍射光以外的杂散光）进入光电检测器（106）。

2. 发明公开

EP1253588A1 OPTICAL HEAD DEVICE 审中-公开
标题翻译： OPTISCHER KOPF
公开(公告)号：EP1253588A1
公开(公告)日：2002-10-30
申请号：EP01902732.5
申请日：2001-02-01
申请人： Matsushita Electric Industrial Co., Ltd.
发明人： TAKASUKA, Shoichi , IJIMA, Shin'ichi , NAKANISHI, Naoki , NAKANISHI, Hideyuki
IPC分类号： G11B7/135 , G11B11/105
CPC分类号： G11B7/1356 , G11B7/0901 , G11B7/0904 , G11B7/123 , G11B7/131 , G11B7/1353 , G11B7/1359 , G11B7/1374 , G11B7/1376
摘要： A 3-beam-generating grating 2, a collimating lens 3, a polarizing beam splitter 4, a rising mirror 5 and an objective lens 6 are arranged sequentially in the optical path between a semiconductor laser device 1 and an information recording medium 7. The reflecting face of the polarizing beam splitter 4 has a reflection characteristic such that the reflectance is minimum for return light L2 at an angle of 45 degrees whereas the reflectance increases as the incident angle of the return light L2 deviates from 45 degrees. This realizes an optical head device that is not likely to cause the decrease in tracking error signals even if the objective lens shifts in radial directions of the recording medium.
摘要翻译：三光束产生光栅2，准直透镜3，偏振光束分离器4，上升反射镜5和物镜6依次布置在半导体激光器件1和信息记录介质7之间的光路中。偏振光束分离器4的反射面具有反射特性，使得对于45度角的返回光L2的反射率最小，而反射率随着返回光L2的入射角偏离45度而增加。这实现了即使物镜在记录介质的径向上移动也不可能导致跟踪误差信号的减小的光学头装置。

3. 发明公开

EP1298651A1 OPTICAL DEVICE, OPTICAL SEMICONDUCTOR DEVICE, AND OPTICAL INFORMATION PROCESSOR COMPRISING THEM 审中-公开
标题翻译：光学装置，光学HALBLEITERGERAET和包含光学信息处理机
公开(公告)号：EP1298651A1
公开(公告)日：2003-04-02
申请号：EP01947832.0
申请日：2001-07-04
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： NAKANISHI, Naoki , TAKASUKA, Shoichi , IJIMA, Shinichi , NAKANISHI, Hideyuki
IPC分类号： G11B7/09 , G11B7/13 , G11B7/135 , H01S5/022
CPC分类号： G11B7/1353 , G11B7/0903 , G11B7/0912 , G11B7/0943 , G11B7/123 , G11B7/131 , H01S5/02248 , H01S5/02296
摘要： An optical semiconductor device is provided that includes an emitted beam dividing portion (61) for dividing an emitted light beam from the laser element (51), a reflected beam dividing portion (71) for dividing a reflected light beam from an information recording medium (3) into light beams in different focused states, servo-signal-detecting photodetector elements (43, 45) for receiving the reflected light beams obtained by the division by the reflected beam dividing portion in a defocused state, a first diffraction grating that is provided in the emitted beam dividing portion and that diffracts the reflected light beam having passed through the reflected beam dividing portion, and a signal-detecting photodetector element (47) for receiving reflected light beams having been subjected to the diffraction by the first diffraction grating.

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