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1.发明授权Device for optically scanning information tracks on a plane using two subbeams 失效用于使用两个子光线在平面上光学扫描信息轨道的装置公开(公告)号：US06512732B1
公开(公告)日：2003-01-28
申请号：US08764830
申请日：1996-12-12
IPC分类号： G11B700
CPC分类号： G11B7/1353 , G11B7/0908 , G11B7/0916 , G11B7/094 , G11B7/0943
摘要： A device for optically scanning an information plane having tracks. Radiation is supplied by a radiation source focused on the information plane by an objective system. The beam reflected by the information plane is incident on a dividing element, for example a grating which divides the beam into two halves along a dividing line. Two sub-gratings at both sides of the dividing line each form a detection beam from one half of the beam, which detection beams are detected each by a detector. A focus error signal is generated from the detector signals by forming a difference signal of the two detector signals and dividing this difference signal by the sum signal of the two detector signals. The focus error signal is relatively insensitive to the position accuracy of the detectors with respect to the detection beams.
摘要翻译： 一种用于光学扫描具有轨道的信息平面的装置。 通过客观系统的聚焦在信息平面上的辐射源提供辐射。 由信息平面反射的光束入射在分割元件上，例如沿着分界线将光束分成两半的光栅。 分割线两侧的两个子光栅各自形成来自光束一半的检测光束，该检测光束由检测器检测。 通过形成两个检测器信号的差信号并将该差分信号除以两个检测器信号的和信号，从检测器信号产生聚焦误差信号。 聚焦误差信号对于检测器相对于检测光束的位置精度相对不敏感。
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公开(公告)号：US5103439A
公开(公告)日：1992-04-07
申请号：US352445
申请日：1989-05-16
CPC分类号： G11B7/08511 , G11B7/0909 , G11B7/0916
摘要： A focus control system for optical record carrier scanning apparatus includes a mechanical actuator (13) for moving the focus of the scanning beam relative to a recording layer of the record carrier, a focus-error detection circuit (15, 16, 17) for generating a focus-error signal (FE), and a control circuit (26) for generating a first control signal (AS') for the actuator (13) which is proportional to the focus-error signal (FE). In order to ensure that the actuator is within its generating range when it locks-in to the focus-error signal, the system also includes a lock-in circuit (20) having a signal generator (21) and an integrator (23) for generating an additional control signal (AS') for the actuator (13) prior to lock-in. A lock-in detection circuit (25) generates a lock-in signal (IN FOCUS) when the focus error is in the operation range, which causes a switch (22) to change-over the input to integrator (23) to the focus-error signal (FE) and also enables the control circuit (26) to provide the first control signal (AS'). Thus, after lock-in the integrator (23) and the control circuit (26) constitute a controller for controlling actuator (13) in accordance with both the focus-error signal and the integral thereof. This compensates for low-frequency disturbances and renders the control system more immune to variations in the parameters affecting correct beam focus position.
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公开(公告)号：US4712091A
公开(公告)日：1987-12-08
申请号：US811237
申请日：1985-12-20
摘要： A D/A converter providing a binary weighted series of currents (I.sub.3, I.sub.4, I.sub.5) via first current-source transistors (T.sub.3, T.sub.4, T.sub.5) each in a given ratio to a reference current (I.sub.1) in a reference transistor (T.sub.1). The weighted currents are switched to analog output (15) or to positive supply terminal (20) via first switching devices (3.1, 3.2, 3.3). A control device includes a second current-source transistor (T.sub.8) connected to a reference-current source or to the positive supply terminal via a second switching device (4). The current (I.sub.8) in the transistor T.sub.8 has a given ratio to the reference current (I.sub.1). By connecting the second current-source transistor to the positive supply terminal or to the reference current source, the reference transistor carries the full reference current (I.sub.ref) from the reference current source or only a fraction of the full reference current, respectively. As the weighted currents are in a given ratio to the current (I.sub.1) in the reference transistor, these currents are a similar fraction smaller in the first case than in the second case. By increasing the reference transistor current (I.sub.1) stepwise from a fraction to the full reference current over the range of the digital input code, the converter output current range will also vary stepwise.
摘要翻译： AD / A转换器通过第一电流源晶体管（T3，T4，T5）以给定的比率与参考晶体管（T1）中的参考电流（I1）提供二进制加权系数的电流（I3，I4，I5） 。 加权电流通过第一开关器件（3.1,3.2,3.3）切换到模拟输出（15）或正电源端（20）。 控制装置包括通过第二开关装置（4）连接到参考电流源或正电源端的第二电流源晶体管（T8）。 晶体管T8中的电流（I8）与参考电流（I1）具有给定的比率。 通过将第二电流源晶体管连接到正电源端或参考电流源，参考晶体管分别承载参考电流源的完全参考电流（Iref）或者仅分配完整参考电流的一部分。 由于加权电流与参考晶体管中的电流（I1）具有给定的比例，所以这些电流在第一种情况下与第二种情况相似。 通过在数字输入代码的范围内逐步将参考晶体管电流（I1）逐步增加到全参考电流，转换器输出电流范围也将逐步变化。
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4.发明授权Apparatus for reproducing information from an optically readable record carrier 失效用于从光学可读记录载体再现信息的装置
公开(公告)号：US4583209A
公开(公告)日：1986-04-15
申请号：US570564
申请日：1984-01-13
CPC分类号： G11B7/0901
摘要： An apparatus is described for reading an optically readable record carrier in which a light beam which has been modulated by the record carrier is incident on a detector divided into four quadrants. A tracking-error signal is obtained by measuring the time intervals between corresponding zero crossings of a first signal supplied by two diagonally situated sub-detectors of said detector and a second signal supplied by the two other diagonally situated sub-detectors and/or all four sub-detectors.
摘要翻译： 描述了一种用于读取光学可读记录载体的装置，其中由记录载体调制的光束入射到分为四个象限的检测器上。 通过测量由两个对角位于所述检测器的两个对角位置的子检测器提供的第一信号和由另外两个对角位置的子检测器提供的第二信号和/或所有四个检测器之间的时间间隔来获得跟踪误差信号 子检测器
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公开(公告)号：US4193091A
公开(公告)日：1980-03-11
申请号：US905890
申请日：1978-05-15
CPC分类号： G11B7/0937 , G11B7/08 , G11B7/093 , G11B7/123 , H01S5/02272 , H01S5/024
摘要： An optical read unit for reading radiation-reflecting video discs comprises a semiconductor laser which with the aid of a scan wobbler and a focussing wobbler is moved at high frequency in two directions relative to the video disc, a radial direction for tracking purposes and a direction normal to the disc for the purpose of automatic focussing. The semiconductor diode laser is mounted on a metal radiation source carrier which is connected to a heat sink for carrying off the heat with a low temperature gradient, and is driven by piezo-electric plates.
摘要翻译： 用于读取辐射反射视频光盘的光学读取单元包括半导体激光器，借助于扫描摆动器和聚焦摇摆器，相对于视频盘在两个方向上以高频率移动，用于跟踪目的的径向方向和方向 正常的光盘为了自动聚焦。 半导体二极管激光器安装在金属辐射源载体上，金属辐射源载体连接到散热器，用于以低温度梯度传导热量，并由压电板驱动。
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6.发明授权Laser power supply circuit as well as option recording and/or reading device comprising such a laser power supply circuit 失效激光电源电路以及包括这种激光电源电路的选件记录和/或读取装置
公开(公告)号：US5708647A
公开(公告)日：1998-01-13
申请号：US576624
申请日：1995-12-21
CPC分类号： G11B7/126 , H01S5/0683 , H01S5/042 , H01S5/06832
摘要： A laser power supply control circuit may, when the power supply is initially turned on, temporarily permit an excessive supply voltage which may damage the laser. To prevent that, but without restricting the operating range or speed of response of the control circuit, the invention provides a sensing circuit for deriving a sensor signal indicative of a change in the loop gain of the control circuit when it departs from its normal operating mode. The sensor signal is used to prevent the power supply control signal from increasing excessively after a temporary reduction in supply voltage, but permits the control signal to operate substantially immediately when the supply voltage returns to its normal operating range.
摘要翻译： 激光电源控制电路可以在电源最初接通时暂时允许可能损坏激光器的过大的电源电压。 为了防止这一点，但是在不限制控制电路的工作范围或响应速度的情况下，本发明提供了一种感测电路，用于在控制电路脱离其正常操作模式时导出指示控制电路的环路增益变化的传感器信号 。 传感器信号用于在电源电压暂时降低之后防止电源控制信号过度增加，但是当电源电压恢复到正常工作范围时，允许控制信号基本上立即运行。
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公开(公告)号：US5105249A
公开(公告)日：1992-04-14
申请号：US744678
申请日：1991-08-09
CPC分类号： G11B7/131 , H01L27/1443 , H01L31/02024 , H01L31/1105
摘要： The invention relates to a semiconductor device comprising a radiation-sensitive element (A . . . D). The radiation-sensitive element includes a transistor (T) having an emitter region (6), a base region (4) and a collector region (2), and further a radiation-sensitive region (7) having a rectifying junction (5). Due to the presence of the transistor (T), such an element (A . . . D) can supply a considerably larger output signal than a photodiode. On the contrary, however, the first-mentioned element (A . . . D) is comparatively slow as compared with a photodiode due to the parasitic capacitance of the rectifying junction (5). The invention obviates this disadvantage in that according to the invention the radiation-sensitive region (7) has at least a first subregion (71) and a second subregion (72) and the transistor (T) is subdivided into two subtransistors (T.sub.1, T.sub.2), whose base regions (4) are separately connected to the subregions (71, 72). The collector regions (2) and the emitter regions (6) of the subtransistors (T.sub.1, T.sub.2) are interconnected.
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8.发明授权Radiation sensitive semiconductor device for optical reading or writing unit 失效用于光学阅读或书写单元的辐射敏感半导体器件
公开(公告)号：US5097307A
公开(公告)日：1992-03-17
申请号：US545423
申请日：1990-06-27
IPC分类号： H01L27/14 , G11B7/13 , H01L27/144 , H01L31/02 , H01L31/11
CPC分类号： G11B7/131 , H01L27/1443 , H01L31/02024 , H01L31/11
摘要： A radiation-sensitive semiconductor device comprises a semiconductor body having a first semiconductor region of a first conductivity type, which adjoins with one side a surface of the semiconductor body and adjoins within it at a certain distance from and substantially parallel to the surface a second semiconductor region of a second conductivity type opposite to the first type and forms with it a first pn junction. Such semiconductor devices are used in a reading or writing unit for a system for optical recording, such as CD, LV, DOR and CDV.In one embodiment having a semiconductor region at least two further regions are present, which are located at the surface and each form with the first semiconductor region a further pn junction substantially parallel to the surface and at a smaller distance therefrom than the first pn junction. Moreover, the further regions, like the first semiconductor region, are coupled to reading members, by means of which a current can be measured. As a result, the further semiconductor regions can be thin and can therefore be arranged close to each other so that a focus error signal without a dip is obtained via the reading members coupled to these regions. Since the further regions result in diodes having an inverse polarity, class B amplifiers based on npn transistors may now be integrated in with the semiconductor device so that a separation circuit requiring comparatively large capacitances is no longer necessary.
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9.发明授权Apparatus for reading a disc-shaped record carrier having a PAL color television signal 失效用于读取具有PAL彩色电视信号的盘形记录载体的装置
公开(公告)号：US4236173A
公开(公告)日：1980-11-25
申请号：US7856
申请日：1979-01-31
摘要： An apparatus for reading a disc-shaped record carrier on which per track circumference one picture of a color television signal is recorded. The signal being read is converted to a standard PAL color television signal. The apparatus comprising a command device which by applying command signals to control means can produce a jumpwise radial change in the scanning position on the record carrier, so as to enable the scanning sequence of the recorded pictures to be changed. In order to maintain a standard PAL color television signal in the case of a changed scanning sequence, the apparatus comprises a correction device for the chrominance signal. This correction device is controlled by the command device and comprises a mixing circuit for mixing the chrominance signal with a reference signal of twice the chrominance subcarrier frequency during time intervals prescribed by the command device, and phase correction means for introducing a phase shift of 0.degree., 90.degree., 180.degree., or 270.degree. in the chrominance signal in accordance with a pattern defined by the command device.
摘要翻译： 一种用于读取记录有彩色电视信号的一个图像的轨道周围的盘形记录载体的装置。 被读取的信号被转换成标准的PAL彩色电视信号。 包括通过向控制装置施加命令信号的指令装置的装置可以在记录载体上的扫描位置产生跳跃的径向变化，以便能够改变记录图像的扫描顺序。 为了在改变的扫描顺序的情况下保持标准PAL彩色电视信号，该装置包括用于色度信号的校正装置。 该校正装置由指令装置控制，包括混合电路，用于将色度信号与由指令装置规定的时间间隔内的色度副载波频率的两倍的参考信号混合;以及相位校正装置，用于引入0°的相移 ，90°，180°+ 20°或270°的色度信号。
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10.发明授权Record carrier scanning apparatus with feedback control system for controlling scanning point position and velocity 失效具有反馈控制系统的记录载体扫描装置，用于控制扫描点位置和速度
公开(公告)号：US5036506A
公开(公告)日：1991-07-30
申请号：US316396
申请日：1989-02-27
CPC分类号： G11B7/08541 , G11B21/10 , G11B7/08517 , G11B7/08529 , G11B7/0946
摘要： Apparatus for scanning a record carrier having substantially parallel recording tracks, which apparatus includes a position control system with position and velocity feedback for controlling the scanning point toward the center of a track being scanned. Such position control system produces a velocity signal (RS) indicative of the velocity of the scanning point and an error signal (RE) which, within a limited first range to either side of the track center, is proportional to the deviation from the track center. The position control system has a feedback loop which includes a control circuit for controlling the positioning of the scanning point in accordance with the error signal (RE) and the velocity signal (RS), such control circuit generating at least one substitute error signal (PE', UC') when the scanning point deviation is in a second range beyond the aforesaid first range, the substitute error signal having a sign indicative of the direction of such deviation. The control circuit provides the velocity signal (RS) and a position control signal in the feedback loop in response to either the error signal (RE) or the substitute error signal (UC', PE'), depending on whether the deviation is within the first range or the second range. The velocity control signal (RS) is independent of the magnitude of the scanning point deviation.
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