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    • 19. 发明授权
    • Optical information recording/reproduction apparatus including an
integrated photodetector used in the detection of focusing and/or
tracking error signals
    • 光信息记录/重放装置包括用于检测聚焦和/或跟踪误差信号的集成光电探测器
    • US5629911A
    • 1997-05-13
    • US159476
    • 1993-11-30
    • Kenichi Sasaki
    • Kenichi Sasaki
    • G11B7/09G11B7/13G11B11/105
    • G11B7/131G11B11/10576G11B7/0903G11B7/0912G11B7/133
    • An optical information recording/reproduction apparatus includes a radiation device for radiating a light beam onto an information recording medium, a converging device for converging the light beam reflected by the information recording medium, a first device for splitting the converged light beam into two light beams, a second device for guiding the two split light beams onto a single light-receiving surface, which can receive the two light beams, via optical paths having different optical path lengths, the second device guiding the two light beams, so that one of the two split light beams is projected onto the light-receiving surface at a position before the light beam passes a convergent point thereof, and the other light beam is projected onto the light-receiving surface at a position after the light beam passes a convergent point thereof, an integrated photodetector including at least two photodetection regions for receiving the light beams on the light-receiving surface, a size, in one direction, of each of the photodetection regions of the photodetector being set to be smaller than a beam spot size on the light-receiving surface in an in-focus state and device for detecting, focusing error signals from the light beams on the light-receiving surface, by the photodetection regions.
    • 一种光信息记录/再现装置,包括用于将光束照射到信息记录介质上的辐射装置,用于会聚由信息记录介质反射的光束的会聚装置,用于将会聚光束分成两束光束 ,用于通过具有不同光程长度的光路将两个分离的光束引导到可以接收两个光束的单个光接收表面上的第二装置,第二装置引导两个光束,使得第二装置 在光束通过其收敛点的位置处,两个分离的光束被投射到光接收表面上,并且另一个光束在光束通过其收敛点之后的位置处被投射到光接收表面上 包括用于接收光接收表面上的光束的至少两个光电检测区域的集成光电检测器, 在一个方向上,光检测器的每个光电检测区域被设置为小于受聚焦状态下的光接收表面上的光束尺寸,以及用于检测光的装置,用于将来自光束的误差信号聚焦在光 - 接收面,由光电检测区域。