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公开(公告)号：US4897828A
公开(公告)日：1990-01-30
申请号：US219916
申请日：1988-07-15
申请人： You Yoshitoshi , Hidehiro Kume , Yoshiyuki Matsumoto , Koji Mitsumori , Etsufumi Yamamoto , Hiroshi Oinoue
发明人： You Yoshitoshi , Hidehiro Kume , Yoshiyuki Matsumoto , Koji Mitsumori , Etsufumi Yamamoto , Hiroshi Oinoue
CPC分类号： G11B7/1356 , G11B7/0912 , G11B7/123 , G11B7/13
摘要： A focusing error detecting apparatus having a first photo-detector of which the light receiving portion is halved to provide first and second light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the first photo-detector being located in the optical path ahead of the focusing point of the bundle of the incident laser beams, a second photo-detector of which the light receiving portion is halved to provide first and second light receiving portions asymmetrical with respect to the center of a beam spot of a bundle of incident laser beams, the second photo-detector being located in the optical path behind a focussing point of the bundle of the incident laser beams and a calculating circuit for calculating a difference between a difference of detected outputs from the first and second light receiving portions of the first photo-detector and a difference of detected outputs from the first and second light receiving portions of the second photo-detector, thereby to derive a focusing error signal from the output of the calculating circuit.
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公开(公告)号：US5181193A
公开(公告)日：1993-01-19
申请号：US430132
申请日：1989-11-01
摘要： An optical pickup device for a recording and/or reproducing apparatus in which a light beam from a semiconductor laser element is converged by an object lens and irradiated on recording tracks of an optical disk and the light reflected by the disk is sensed to read and/or record data signals. The device includes photosensors each having an insensitive central zone and adapted to receive the reflected light to generate tracking error signals. The semiconductor laser element is so arranged that the light beam is projected on the optical disk so that the meridional plane of the light beam orthogonal to the junction plane of semiconductor layers of the semiconductor laser element is at such an angle with respect to a tangential line drawn to one of the recording tracks of the optical disk that non-symmetricities on both sides of said tangential line as a function of the de-focusing direction of the beam spot may be compensated.
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公开(公告)号：US4893296A
公开(公告)日：1990-01-09
申请号：US219915
申请日：1988-07-15
申请人： Yoshiyuki Matsumoto , Hidehiro Kume , Koji Mitsumori , You Yoshitoshi , Etsufumi Yamamoto , Hiroshi Oinoue
发明人： Yoshiyuki Matsumoto , Hidehiro Kume , Koji Mitsumori , You Yoshitoshi , Etsufumi Yamamoto , Hiroshi Oinoue
CPC分类号： G11B7/1359 , G11B7/123 , G11B7/1356 , H01S5/02248 , H01S5/005 , H01S5/0683
摘要： An optical pickup device having a semiconductor laser element mounted on a substrate, a photo detector formed on the substrate to receive a laser beam emitted from the semiconductor laser element and an optical element mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam, the optical element having its face opposing the semiconductor laser element formed as an inclined face on which a semitransparent reflection film is deposited. The optical path branching optical element is provided with preventing means by which, of laser beams incident on the optical element, a laser beam reflected and/or scattered within the optical element is prevented from irradiating the photo detector.
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公开(公告)号：US5181195A
公开(公告)日：1993-01-19
申请号：US700866
申请日：1991-05-16
申请人： Hidehiro Kume , Etsufumi Yamamoto
发明人： Hidehiro Kume , Etsufumi Yamamoto
CPC分类号： G11B7/0943
摘要： A tracking error signal generator for producing a tracking error signal by first detecting a light beam, which is irradiated from an optical pickup to an optical disc, by an optical detector so divided as to have two optical detecting portions in a direction of a recording track on the optical disc, and then controlling the light beam to follow the recording track on the optical disc in accordance with the detection outputs from the divided optical detector. The tracking error signal generator comprises first and second peak detecting means for detecting the respective peak values of detection output signals from the first and second optical detecting portions of the optical detector divided along the recording track on the optical disc, and arithmetic means for forming a difference signal between signals obtained by applying a coefficient smaller than 1 to multiply respectively the output signal of the first peak detecting means and the detection output of the first optical detecting portion, and signals obtained by applying a coefficient smaller than 1 to multiply respectively the output signal of the second peak detecting means and the detecting output of the second optical detecting portion.
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公开(公告)号：US5144614A
公开(公告)日：1992-09-01
申请号：US837547
申请日：1992-02-14
CPC分类号： G11B7/13 , G11B7/123 , G11B7/127 , G11B7/1356
摘要： An optical pickup device is disclosed in which a light beam from a laser light source is converged by an object lens on a signal recording surface of an optical disk to follow recording tracks formed on the signal recording surface to read out or write data on or from the signal recording surface. A semiconductor laser unit is used as a laser light source and is so arranged that the meridional plane of the light beam emanating from the semiconductor laser unit is inclined 30.degree. to 60.degree. with respect to the tangential direction of the recording track.
摘要翻译： 公开了一种光拾取装置，其中来自激光源的光束被物镜会聚在光盘的信号记录表面上，以跟随形成在信号记录表面上的记录轨迹，以便在或从 信号记录面。 半导体激光单元被用作激光源，并且被布置成使得从半导体激光单元发出的光束的子午面相对于记录轨道的切线方向倾斜30°至60°。
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公开(公告)号：US4873429A
公开(公告)日：1989-10-10
申请号：US152007
申请日：1988-02-03
CPC分类号： G11B7/1381 , G11B7/094 , G11B7/1356 , G11B7/0912
摘要： An optical pickup head comprising a substrate on which a optical sensor is formed, and an optical member adhered on said optical sensor on said substrate by an adhesive and including a semitransmissive reflective film adapted to reflect the light emitting from a laser source and to transmit the light returned from a second medium of a disk, characterized in that the refractive index of said optical member is set so as to be larger than the refractive index of said adhesive.
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公开(公告)号：US4823331A
公开(公告)日：1989-04-18
申请号：US130112
申请日：1987-10-23
CPC分类号： G11B7/1356 , G11B7/0912 , G11B7/123 , G11B7/131 , G11B7/0925
摘要： The present invention relates to a focusing detection apparatus (1) for detecting a focusing state of an optical recording medium. So as to achieve compactness and low cost of the focusing detection apparatus (1), focusing detection using two photosensors (33) (34) located in front of and behind a convergent point of a beam (45) reflected by the optical recording medium can be achieved by a single prism (37), and a plurality of optical components (31) (33) (34) (37) are formed integrally and can be arranged on a single surface of a semiconductor substrate (32). The present invention is applicable to an optical head requiring compactness, light weight, and low cost as well as high performance.
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8.发明申请公开(公告)号：US20070115479A1
公开(公告)日：2007-05-24
申请号：US11654815
申请日：2007-01-18
IPC分类号： G01B9/02
CPC分类号： G01D5/38
摘要： A displacement detection device having excellent stability with the lapse of time and suitable for reduction in size and weight includes: a light source for emitting light; polarizing light splitting unit for splitting the light emitted from the light source into two light beams having difference polarized components, radiating the two light beams to an external optical system, and combining the two light beams reflected by the external optical system to generate combined light; a phase plate provided between the light source and the polarizing light splitting unit and adapted for changing the polarization state of the light emitted from the light source and leading the light to the polarizing light splitting unit; light splitting films for splitting the combined light generated by the polarizing light splitting unit into plural light beams; polarizing units for transmitting only a predetermined polarized components of the split combined light beams; and light-receiving elements for photoelectrically converting coherent light beams transmitted through the polarizing units and thus generating an interference signal.
摘要翻译： 具有优异的时间稳定性和适合于减小尺寸和重量的位移检测装置包括：用于发光的光源; 偏振光分离单元，用于将从光源发射的光分成具有差分偏振分量的两个光束，将两个光束照射到外部光学系统，并且组合由外部光学系统反射的两个光束以产生组合光; 设置在所述光源和所述偏振光分离单元之间的相位板，用于改变从所述光源发射的光的偏振状态并将光引导到所述偏振光分离单元; 用于将由偏振光分离单元产生的组合光分离成多个光束的分光膜; 用于仅透射分离的组合光束的预定偏振分量的偏振单元; 以及用于光电转换透射通过偏振单元的相干光束并由此产生干涉信号的光接收元件。
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公开(公告)号：US5965982A
公开(公告)日：1999-10-12
申请号：US924141
申请日：1997-09-05
申请人： Masumi Tachino , Hidehiro Kume , Suenori Kimura , Takashi Goto
发明人： Masumi Tachino , Hidehiro Kume , Suenori Kimura , Takashi Goto
CPC分类号： H01J43/28
摘要： The present invention relates to a versatile side-on type photomultiplier comprising a structure for improving the uniformity in light receiving sensitivity. Disposed on the outer peripheral surface of a sealed envelope of this photomultiplier is a restricting member which guides light to be detected into, of the light receiving surface of a photocathode, an effective region where the light receiving sensitivity is high, thereby restraining the light to be detected from reaching the outside of the effective region.
摘要翻译： 本发明涉及一种通用的侧接式光电倍增管，其包括用于提高光接收灵敏度的均匀性的结构。 在该光电倍增管的密封外壳的外周面上配置有将被检测光引导到光电面的受光面的受光灵敏度高的有效区域的限制构件， 被检测到达到有效区域的外部。
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10.发明授权Side-on type photomultiplier comprising an envelope having an opening, a lens element, and a lens positioning structure 失效侧面型光电倍增器，其包括具有开口的外壳，透镜元件和透镜定位结构
公开(公告)号：US5847380A
公开(公告)日：1998-12-08
申请号：US924263
申请日：1997-09-05
申请人： Masumi Tachino , Hidehiro Kume , Suenori Kimura , Takashi Goto
发明人： Masumi Tachino , Hidehiro Kume , Suenori Kimura , Takashi Goto
摘要： The present invention relates to a versatile side-on type photomultiplier comprising a structure for improving the uniformity in light receiving sensitivity. This photomultiplier comprises a positioning structure for precisely positioning, with respect to the light receiving surface of a photocathode, a lens element which guides light to be detected to a photocathode and constitutes a part of an envelope accommodating the photocathode. The precisely positioned lens element guides the light to be detected into, of the light receiving surface of the photocathode, an effective region where the light receiving sensitivity is high, thereby restraining the light to be detected from reaching the outside of the effective region.
摘要翻译： 本发明涉及一种通用的侧接式光电倍增管，其包括用于提高光接收灵敏度的均匀性的结构。 该光电倍增管包括用于相对于光电阴极的光接收表面精确定位将光检测的光引导到光电阴极并构成容纳光电阴极的封套的一部分的透镜元件的定位结构。 精确定位的透镜元件将待检测的光引导到光电阴极的光接收表面中，其中光接收灵敏度高的有效区域，从而抑制被检测的光到达有效区域的外部。
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