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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：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：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：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：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：US6134198A
公开(公告)日：2000-10-17
申请号：US929189
申请日：1997-09-08
CPC分类号： G11B7/123 , G11B7/094 , G11B7/0943 , G11B7/133 , G11B7/0901
摘要： A tracking error signal calculation circuit has peak detection multiplication circuits which detect the peaks of the detection signals of left and right regions of a photodiode and multiply a coefficient for detecting the deviation of the beam light with respect to the track of the disc recording medium, subtraction circuits for removing an offset by subtracting these multiplication results from the detection signals, and a subtraction circuit which calculates a difference of the signal obtained by removing the offset (performs push-pull operation) and outputs a tracking error signal. The value of the coefficient can be changed by adding an alignment signal to the detection signal. In order to impart the frequency dependency to this coefficient, the alignment signal is added to the signal through a filter.
摘要翻译： 跟踪误差信号计算电路具有峰值检测乘法电路，其检测光电二极管的左右区域的检测信号的峰值，并乘以用于检测光束光相对于盘记录介质的轨迹的偏差的系数， 减法电路，用于通过从检测信号中减去这些相乘结果来消除偏移;以及减法电路，其计算通过去除偏移而获得的信号的差值（执行推挽操作）并输出跟踪误差信号。 可以通过向检测信号添加对准信号来改变系数的值。 为了赋予该系数的频率依赖性，通过滤波器将对准信号与信号相加。
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7.发明授权Apparatus and method for controlling rotational speed during a pause operation 失效用于在暂停操作期间控制转速的装置和方法
公开(公告)号：US6130868A
公开(公告)日：2000-10-10
申请号：US946682
申请日：1997-10-08
申请人： Etsufumi Yamamoto
发明人： Etsufumi Yamamoto
CPC分类号： G11B19/20 , G11B7/08517 , G11B7/0953 , G11B7/0956
摘要： In a disc drive for use in a disc recording/reproduction apparatus in which information is recorded to and/or reproduced from a disc, the rotational speed of the disc when a pause operation is performed is smaller than the rotational speed of the disc when information is recorded to or reproduced from the disc.
摘要翻译： 在用于将信息记录到盘中和/或从盘再现的盘记录/再现装置中的盘驱动器中，当执行暂停操作时盘的转速小于盘的旋转速度，当信息 被记录到盘或从盘再现。
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8.发明授权Method of adjusting optics of optical pickup using error negating signal processing technique 失效使用误差消除信号处理技术调整光学拾取器的光学方法
公开(公告)号：US5606537A
公开(公告)日：1997-02-25
申请号：US492549
申请日：1995-06-20
申请人： Etsufumi Yamamoto
发明人： Etsufumi Yamamoto
摘要： Method of adjusting optics of an optical pickup using a light-emitting-and-receiving device comprising a semiconductor substrate on which a light-emitting portion and a light-receiving portion are integrally formed. The light-receiving portion consists of a first array and a second array of light-emitting elements. These two arrays are in line in the tracking direction of an optical disk. The light-emitting elements of each array are arrayed in the radial direction of the disk. The output signals from the light-emitting elements of these two arrays are summed up to produce a control signal. The position of the light-emitting-and-receiving device is adjusted in response to the control signal.
摘要翻译： 使用包括发光部分和光接收部分一体形成的半导体衬底的发光和接收装置来调整光学拾取器的光学器件的方法。 光接收部分由第一阵列和第二阵列的发光元件组成。 这两个阵列在光盘的跟踪方向上成行。 每个阵列的发光元件沿盘的径向排列。 来自这两个阵列的发光元件的输出信号相加以产生控制信号。 响应于控制信号调整发光和接收装置的位置。
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