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公开(公告)号：US4937440A
公开(公告)日：1990-06-26
申请号：US400097
申请日：1989-08-29
CPC分类号： G11B7/131 , B23K26/04 , G11B11/10576 , G11B19/04 , G11B7/0912
摘要： A system and method for maintaining focus of a laser beam on the surface of an erasable magneto-optic disk during erase operations is disclosed. The laser beam exhibits beam farfield shift during erase operations, complicating the maintenance of optimal focus. An optical detector is exposed to laser light reflected to the disk to generate signals governing operation of a focusing lens' servo system. A digital signal processor is included in the servo system and is programmed to compensate for beam farfield shift by generation of an offset correction signal during periods of erase power operation. The offset correction signal is generated by the digital signal processor by comparison of optical detector output signals generated during operation of the laser source where no beam farfield shift occurs and the output signals generated where beam farfield shift is occurring, but the system is known to be in focus.
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2.发明授权Optical disk tracking and seeking systems and specific track formats using servo areas 失效光盘跟踪和寻道系统以及使用伺服区的特定轨迹格式
公开(公告)号：US4914645A
公开(公告)日：1990-04-03
申请号：US147690
申请日：1988-01-25
申请人： Kurt W. Getreuer , Johannes J. Verboom , David L. Schell , David E. Lewis , Gregory V. Hofer , Kathleen M. Connelly , James C. McDonald , Pierre R. Sonneville , Cees van Nimwegen
发明人： Kurt W. Getreuer , Johannes J. Verboom , David L. Schell , David E. Lewis , Gregory V. Hofer , Kathleen M. Connelly , James C. McDonald , Pierre R. Sonneville , Cees van Nimwegen
CPC分类号： G11B7/0938 , G11B7/085 , G11B7/0901 , G11B7/24085
摘要： An optical disk recording system including a record medium is disclosed for providing an accurate track crossing count and an accurate track following signal. A first embodiment utilizes off-centered wobbled areas located in the headers of the record medium. The high frequency content of a first signal is combined with the low frequency content of a second signal, which is generated using the wobbled areas. In another embodiment, light-reflective discontinuities are provided in the header areas of the record medium. A qualifier and an AGC are utilized in providing a corrected track following signal. In still another embodiment, reflective discontinuities are located in the servo areas of the record medium. In such an embodiment, it is preferred that there is a fixed gain adjustment to a radial push-pull signal. With regard to each of the three aforesaid embodiments, a track following signal is corrected to compensate for aberrations that are caused by a shift of the light beam returned from the record medium surface. In yet another embodiment, the track following signal is generated using only the central aperture or wobble signal. In this embodiment, it is preferred that three pits be utilized in connection with the track following operation. The three pits are provided in two servo bytes of information located in the servo areas. Two of the three pits are wobble pits and the third pit is used in clocking.
摘要翻译： 公开了一种包括记录介质的光盘记录系统，用于提供准确的轨道交叉计数和准确跟踪信号。 第一实施例使用位于记录介质的头部中的偏心摆动区域。 第一信号的高频内容与使用摆动区域产生的第二信号的低频内容组合。 在另一个实施例中，在记录介质的标题区域中提供光反射不连续性。 使用限定符和AGC来提供校正后的跟踪信号。 在另一个实施例中，反射不连续性位于记录介质的伺服区域中。 在这样的实施例中，优选的是对径向推挽信号进行固定增益调整。 对于上述三个实施例中的每一个，对跟踪跟踪信号进行校正，以补偿由从记录介质表面返回的光束的偏移引起的像差。 在另一个实施例中，仅使用中心孔径或摆动信号产生跟踪信号。 在该实施例中，优选地，跟踪跟踪操作结合使用三个凹坑。 三个凹坑位于伺服区域的两个伺服字节的信息中。 三个凹坑中的两个是摆动凹坑，第三个凹坑用于计时。
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3.发明授权Apparatus for attenuating optical crosstalk induced components of a focus error signal in an optical disk drive 失效用于衰减光学串扰的装置，其导致光盘驱动器中的聚焦误差信号的分量
公开(公告)号：US5199011A
公开(公告)日：1993-03-30
申请号：US739926
申请日：1991-08-02
CPC分类号： G11B7/0945 , G11B7/094 , G11B7/0941 , G11B7/0948
摘要： An apparatus for attenuating optical crosstalk induced components of a focus error signal in an optical disk drive of the type having a grooved optical disk with servo tracks and tracking and focus servo systems controlled by a digital signal processor. A calibration operation is performed whenever a new disk is inserted into the track. During the calibration operation, the disk is scanned about a tracking axis at a track crossing frequency greater than the focus servo system bandwidth. The focus error signals produced when the disk is scanned are filtered about a pass band including the track crossing frequency. Crosstalk values equal to values of the filtered focus error signals are determined as a function of corresponding values of the tracking error signals, and are stored in memory. A correction operation is performed while reading and writing data on the disk. During the correction operation, the crosstalk values are read from memory as a function of corresponding values of the tracking error signals, and summed with the focus error signals.
摘要翻译： 一种用于衰减光学串扰的装置，该光学串扰引起的光盘驱动器中的聚焦误差信号的分量具有带伺服磁道的带凹槽的光盘和由数字信号处理器控制的跟踪和聚焦伺服系统。 无论何时将新磁盘插入轨道，都会执行校准操作。 在校准操作期间，磁盘围绕跟踪轴扫描，轨道交叉频率大于聚焦伺服系统带宽。 当扫描光盘时产生的聚焦误差信号围绕包含轨迹交叉频率的通带进行滤波。 与滤波的聚焦误差信号的值相等的串扰值被确定为跟踪误差信号的对应值的函数，并被存储在存储器中。 在盘上读取和写入数据的同时执行校正操作。 在校正操作期间，作为跟踪误差信号的对应值的函数从存储器读出串扰值，并且与聚焦误差信号相加。
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公开(公告)号：US5113384A
公开(公告)日：1992-05-12
申请号：US411706
申请日：1989-09-25
IPC分类号： G11B7/085 , G11B7/09 , G11B11/105
CPC分类号： G11B7/08511 , G11B7/0945 , G11B11/10576 , G11B11/10595 , G11B7/0908
摘要： A method for obtaining focus capture in an optical disk drive having a focus servo system with a servo loop and operable in open and closed loop modes, including: opening the servo loop and operating the servo system in the open-loop mode; scanning an objective lens about a focus axis with respect to an optical disk at a calibration velocity; peak detecting focus error signals produced while the lens is scanned at the calibration velocity to determine a peak focus error signal value; storing a calibration threshold value as a function of the peak focus error signal value; scanning the objective lens about the focus axis at a focus capture velocity; comparing the focus error signal values produced while the lens is scanned at the focus capture velocity to the calibration threshold value; and closing the servo loop and operating the focus servo system in the closed-loop mode when the focus error signal values reach the calibration threshold value.
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公开(公告)号：US4942564A
公开(公告)日：1990-07-17
申请号：US265219
申请日：1988-10-31
IPC分类号： G11B7/09
CPC分类号： G11B7/0941 , G11B7/09 , G11B7/0945
摘要： A method for operating a programmable digital signal processor in an optical disk drive to compensate tracking and/or focus servo system gain each time a new disk is inserted. The digital signal processor receives a servo error signal and outputs a servo control signal. Data characteristic of a desired servo system gain at a predetermined test frequency is stored in memory. The digital signal processor generates a test signal at the test frequency and sums the test signal with the servo error signal. Servo system gain at the test frequency is determined by computing the ratio of the amplitude of the servo error signal before it is summed with the test signal and the amplitude of the summed servo error signal and test signal. A corrected gain factor is computed as a function of the current servo system gain, the desired servo system gain and current gain factor. The corrected gain factor is stored in memory. The servo error signal is thereafter multiplied by the gain factor so servo system gain equals the desired servo system gain.
摘要翻译： 一种用于在光盘驱动器中操作可编程数字信号处理器以补偿每次插入新磁盘时跟踪和/或聚焦伺服系统增益的方法。 数字信号处理器接收伺服误差信号并输出伺服控制信号。 在预定测试频率下所需伺服系统增益的数据特性被存储在存储器中。 数字信号处理器以测试频率产生测试信号，并将测试信号与伺服误差信号相加。 在测试频率下的伺服系统增益通过计算伺服误差信号的幅度与测试信号相加的幅度与求和的伺服误差信号和测试信号的幅度之比来确定。 根据当前的伺服系统增益，期望的伺服系统增益和电流增益因子计算校正的增益因子。 校正的增益因子存储在存储器中。 伺服误差信号此后乘以增益因子，因此伺服系统增益等于所需的伺服系统增益。
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6.发明授权Image-exposure systems and methods using detecting motion of a camera to terminate exposure 有权图像曝光系统和方法使用相机的检测运动来终止曝光公开(公告)号：US08045009B2
公开(公告)日：2011-10-25
申请号：US10842222
申请日：2004-05-10
申请人： Donald J. Stavely , Christopher A. Whitman , Gregory V. Hofer , David K. Campbell , Jason E. Yost
发明人： Donald J. Stavely , Christopher A. Whitman , Gregory V. Hofer , David K. Campbell , Jason E. Yost
IPC分类号： H04N5/228
CPC分类号： H04N5/2352 , G03B39/00 , H04N5/23248 , H04N5/23258 , H04N5/2353 , H04N2101/00
摘要： Image-exposure systems and methods are disclosed. One embodiment of the system includes a motion detecting device, and logic configured to determine when to terminate an image-exposure based on detected motion of a camera.
摘要翻译： 公开了图像曝光系统和方法。 该系统的一个实施例包括运动检测装置，以及配置为基于检测到的摄像机的运动来确定何时终止图像曝光的逻辑。
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7.发明授权Digital imaging device shutter calibration method and apparatus using multiple exposures of a single field 有权数字成像装置快门校准方法和使用单场多重曝光的装置公开(公告)号：US07667765B2
公开(公告)日：2010-02-23
申请号：US11155048
申请日：2005-06-17
申请人： Richard Turley , Dan L. Dalton , Daniel M. Bloom , Gregory V. Hofer , Casey L. Miller , Scott A. Woods
发明人： Richard Turley , Dan L. Dalton , Daniel M. Bloom , Gregory V. Hofer , Casey L. Miller , Scott A. Woods
CPC分类号： H04N5/2352
摘要： The shutter of a digital imaging device may be calibrated by comparing a characteristic of two separate exposures obtained from a single field of the device's imaging sensor during a single exposure cycle. Calibrating the shutter in this manner facilitates the accuracy of even very short exposure times.
摘要翻译： 可以通过比较在单个曝光周期期间从设备的成像传感器的单个场获得的两个单独的曝光的特性来校准数字成像装置的快门。 以这种方式校准快门有助于即使非常短的曝光时间的精度。
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8.发明授权Method and apparatus for controlling the depth of field using multiple user interface markers 有权使用多个用户界面标记来控制景深的方法和装置公开(公告)号：US06801717B1
公开(公告)日：2004-10-05
申请号：US10406767
申请日：2003-04-02
申请人： Gregory V. Hofer
发明人： Gregory V. Hofer
IPC分类号： G03B1334
CPC分类号： G03B13/34 , H04N5/23212
摘要： A digital imaging device that allows the user to mark multiple objects with UI markers is disclosed. The digital imaging device automatically adjusts the focus and aperture to include the marked objects in the depth of field of the digital imaging device.
摘要翻译： 公开了允许用户使用UI标记来标记多个对象的数字成像设备。 数字成像设备自动调整聚焦和光圈以将标记的对象包括在数字成像设备的景深中。
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9.发明授权
公开(公告)号：US5710748A
公开(公告)日：1998-01-20
申请号：US504004
申请日：1995-07-19
申请人： Gregory V. Hofer
发明人： Gregory V. Hofer
CPC分类号： G11B7/0946
摘要： An optical disk drive system having a means for detecting off-track conditions with high reliability under conditions causing the objective lens to deviate from optimal focus, such as in the presence of external mechanical shocks. As the lens travels out of focus, the ability to resolve features decreases due to the lose of image contrast, causing a loss of tracking error signal (TES) gain. A digital signal processor (DSP) compensates for this loss by continuously determining an adjustable TES threshold representing the same desired percentage off track and same percentage of TES amplitude. A straight line approximation of this ideal adjustable threshold is used as a threshold to determine if the beam is within the desired amount off track. Alternatively, the DSP amplifies the TES by an amplification function to maintain the TES at a constant value while the objective lens travels out of focus. The TES amplification function is a straight line approximation of an ideal amplification function. The amplified TES is then compared against a fixed TES threshold to determine if the beam is within the desired amount off track. The DSP compensates for head optics astigmatism by shifting the adjustable TES threshold and adjustable TES amplification to a corrected position corresponding to the optimum TES. Dual adjustable and fixed TES thresholds are utilized to filter noise glitches on smaller off track conditions and simultaneously provide fast detection of large off track excursions.
摘要翻译： 一种光盘驱动器系统，具有用于在导致物镜偏离最佳焦点的条件下，例如在存在外部机械冲击的情况下，用于检测在可靠性高的条件下的偏离条件的装置。 随着镜头走出焦点，由于图像对比度的损失，解析特征的能力降低，导致跟踪误差信号（TES）增益的损失。 数字信号处理器（DSP）通过连续地确定表示相同的期望百分比偏离轨迹和相同百分比的TES幅度的可调TES阈值来补偿该损耗。 该理想可调阈值的直线近似被用作阈值，以确定光束是否在期望的量偏离轨迹之内。 或者，DSP通过放大功能放大TES，以在物镜离开焦点时将TES保持在恒定值。 TES放大功能是理想放大功能的直线近似。 然后将放大的TES与固定的TES阈值进行比较，以确定光束是否处于所需量的轨迹以外。 DSP通过将可调TES阈值和可调TES放大转换为对应于最佳TES的校正位置来补偿头部光学像散。 双调节和固定的TES阈值用于在较小的偏离轨道条件下对噪声毛刺进行滤波，并同时提供快速检测大的偏离轨迹偏移。
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10.发明授权公开(公告)号：US07538794B2
公开(公告)日：2009-05-26
申请号：US11048403
申请日：2005-01-31
申请人： Richard Turley , Dan Dalton , Daniel Bloom , Gregory V. Hofer , Casey L. Miller , Scott Woods
发明人： Richard Turley , Dan Dalton , Daniel Bloom , Gregory V. Hofer , Casey L. Miller , Scott Woods
IPC分类号： H04N5/228
CPC分类号： H04N5/235 , H04N5/2355
摘要： A digital imaging device having a CCD sensor array with one or more fields captures both short and long exposures of a particular field during the capture of a single image frame. The short-exposure image data and the long-exposure image data from the particular field may be correlated to estimate motion within the image frame.
摘要翻译： 具有一个或多个场的具有CCD传感器阵列的数字成像装置在捕捉单个图像帧期间捕获特定场的短和长曝光。 可以将来自特定场的短曝光图像数据和长曝光图像数据相关联以估计图像帧内的运动。
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