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1. 发明申请

WO1993009535A1 FOCUS DETECTING MECHANISM AND OPTICAL HEAD AND OPTICAL STORAGE USING THE SAME 审中-公开
标题翻译：重点检测机理和光学头和使用它的光学存储
公开(公告)号：WO1993009535A1
公开(公告)日：1993-05-13
申请号：PCT/JP1992001441
申请日：1992-11-06
申请人： SEIKO EPSON CORPORATION , KOYAMA, Fumio , YONEKUBO, Masatoshi , TAKEDA, Takashi , ARIMURA, Toshio , SAKATA, Hidefumi , YOKOYAMA, Osamu
发明人： SEIKO EPSON CORPORATION
IPC分类号： G11B07/09
CPC分类号： G11B7/131 , G11B7/0909 , G11B7/0912 , G11B7/0916 , G11B7/123 , G11B7/1353 , G11B11/10543
摘要： A focus detecting mechanism wherein the light reflected on an object surface (25) is diffracted by a hologram element (23). The diffracted light includes two astigmatic convergent beams which form least circles of confusion on long photodetector means (29) and (30) in the same plane close to a focal plane (22f) of a lens (22), and a focus signal is obtained on the basis of a differential output from these photodetecting means. Since two diffracted beams having least circles of confusion on the same plane, the photodetecting means can be placed horizontally, and a focus detecting mechanism can be made easily with an improved dimensional accuracy. In spite of the use of a hologram element, the fluctuation of wavelength can be absorbed, and the reliability of the device is very high.
摘要翻译：一种焦点检测机构，其中在物体表面（25）上反射的光被全息元件（23）衍射。衍射光包括两个散光会聚光束，其在与光学透镜（22）的焦平面（22f）接近的同一平面上在长的光电检测器装置（29）和（30）上形成最小的混淆圆，并且获得聚焦信号基于来自这些光检测装置的差分输出。由于在同一平面上具有最少的混淆圆的两个衍射光束，因此可以水平地放置光检测装置，并且可以以改进的尺寸精度容易地制作焦点检测机构。尽管使用全息元件，波长的波动可以被吸收，并且器件的可靠性非常高。

2. 发明申请

WO1994001794A1 POLARIZING ELEMENT AND OPTICAL ELEMENT, AND OPTICAL HEAD 审中-公开
标题翻译：偏光元件和光学元件和光学头
公开(公告)号：WO1994001794A1
公开(公告)日：1994-01-20
申请号：PCT/JP1993000964
申请日：1993-07-13
申请人： SEIKO EPSON CORPORATION , TAKEKOSHI, Taro , YONEKUBO, Masatoshi , TAKEDA, Takashi , ARIMURA, Toshio
发明人： SEIKO EPSON CORPORATION
IPC分类号： G02B05/30
CPC分类号： G11B11/10543 , G02B5/3025 , G11B7/094 , G11B7/131 , G11B7/1353 , G11B7/1356 , G11B7/1365 , G11B7/1381 , G11B11/10532 , G11B11/10536 , G11B2007/13727
摘要： A plurality of slant faces (1419) are formed on a substrate (1406). A polarized optical thin film is formed on the slant faces. The recess defined by the slant faces (1419) is filled with transparent material to form a small composite polarizing element. By this polarizing element, it is possible to detect magneto-optic signals excellent in transmissivity and extinction ratio and high in S/N ratio. Also, this polarizing element serves as the cover of the package (1408) of an optical head which houses a photodetecting element (1409) and a light emitting element (1411) integrally. Also, by use of an optical element having an optical path length adjustment function of varying the optical path length of the outgoing light beam from that of the incoming light beam, it is possible to eliminate the initial offset of the focal point error signals and to omit the adjustment at the same time. In this way, a small, simple and high-performance optical head used for magneto-optic recording and reproducing apparatus can be realized.
摘要翻译：在基板（1406）上形成多个倾斜面（1419）。偏斜光学薄膜形成在倾斜面上。由倾斜面（1419）限定的凹部用透明材料填充以形成小的复合偏振元件。通过该偏振元件，可以检测透射率和消光比优异，S / N比高的磁光信号。此外，该偏振元件用作光学头的封装（1408）的盖，该光学头将光检测元件（1409）和发光元件（1411）整体地容纳在一起。此外，通过使用具有改变出射光束的光路长度的入射光束的光程长度调整功能的光学元件，可以消除焦点误差信号的初始偏移，并且可以消除同时省略调整。以这种方式，可以实现用于磁光记录和再现装置的小型，简单和高性能的光学头。

3. 发明申请

WO1997035306A1 OPTICAL HEAD AND OPTICAL RECORDER 审中-公开
标题翻译：光头和光记录仪
公开(公告)号：WO1997035306A1
公开(公告)日：1997-09-25
申请号：PCT/JP1997000738
申请日：1997-03-10
申请人： SEIKO EPSON CORPORATION , YONEKUBO, Masatoshi , ARIMURA, Toshio , MIYAZAWA, Takao
发明人： SEIKO EPSON CORPORATION
IPC分类号： G11B07/135
CPC分类号： B82Y10/00 , G11B7/005 , G11B7/123 , G11B7/131 , G11B7/133 , G11B7/1353 , G11B7/1367 , G11B7/1381 , G11B20/10009 , G11B2007/0006 , G11B2007/13727
摘要： An optical head and an optical recorder with which data can be recorded/reproduced onto/from a conventional CD-R without a problem and, further, data can be recorded/reproduced onto/from an optical recording medium of DVD standard which meets the requirements of the high recording density by employing a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium and the optical super-resolution technique. Moreover, since a semiconductor laser beam which has a relatively longer wavelength than the track pitch of the optical recording medium can be employed by the optical head and the optical recorder, the limitation of the high density recording can be broken through and the optical pickup device and the optical recorder can record/reproduce data of the high recording density at a low cost and with the high reliability and can meet the requirements of the much higher recording density in future.
摘要翻译：数据可以在常规CD-R上记录/再现数字的光学头和光学记录器，并且还可以从符合要求的DVD标准的光学记录介质上记录/再现数据通过采用具有比光记录介质的轨道间距相对更长的波长的半导体激光束和光学超分辨率技术来获得高记录密度。此外，由于光头和光学记录器可以采用具有比光记录介质的轨道间距更长的波长的半导体激光束，所以可以破坏高密度记录的限制，并且光学拾取装置并且光学记录器可以以低成本和高可靠性记录/再现高记录密度的数据，并且可以满足将来高得多的记录密度的要求。

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