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    • 1. 发明授权
    • Target position identifying apparatus
    • 目标位置识别装置
    • US08077199B2
    • 2011-12-13
    • US13001061
    • 2009-07-17
    • Yoshihiro NakamuraEtsuo YamadaKeiji TakagiMasataka Chiba
    • Yoshihiro NakamuraEtsuo YamadaKeiji TakagiMasataka Chiba
    • H04N7/18
    • H04N17/002G06T7/80G06T2207/10024
    • A target position identifying apparatus includes a color difference converting section for processing pixel values of an image of a target comprised of combination of a first color and a second color obtained from the target under influence of ambient light, thus generating a color component value of the first color, a color component value of the second color and a luminance value, a color region determining section for determining region of the first color and region of the second color, based on the first color component value and the second color component value, with using a determination condition based on either luminance of the captured image or the luminance value, a border detecting section for detecting border between the first color and the second color in the target based on result of the determination by the color region determining section and a target position calculating section for calculating the position of the target on the image based on result of the border detection by the border detecting section.
    • 目标位置识别装置包括:色差转换部分,用于处理由环境光影响下从目标获得的第一颜色和第二颜色的组合的目标图像的像素值,从而生成颜色分量值 第一颜色,第二颜色的颜色分量值和亮度值,基于第一颜色分量值和第二颜色分量值,确定第一颜色和第二颜色的区域的区域的颜色区域确定部分, 使用基于拍摄图像的亮度或亮度值的确定条件,基于由颜色区域确定部分确定的结果和目标来检测目标中的第一颜色和第二颜色之间的边界的边界检测部分 位置计算部分,用于基于边界检测的结果计算图像上的目标的位置 由边界检测部分进行。
    • 7. 发明授权
    • Optical information recording apparatus including means for delaying
servo gain by a predetermined time
    • 光信息记录装置包括用于将伺服增益延迟预定时间的装置
    • US5138596A
    • 1992-08-11
    • US788365
    • 1991-11-06
    • Etsuo Yamada
    • Etsuo Yamada
    • G11B7/0033G11B7/09
    • G11B7/0033G11B7/0941
    • An optical information recording apparatus according to the present invention prevents the saturation of an output of an amplifier, and thereby effects stable tracking and/or focusing servo. The recording apparatus includes a device for inputting an input signal modulated between at least two levels which are not zero in accordance with recording information, a device for converging a light beam intensity modulated between at least two levels which are not zero into a spot-like shape in accordance with the input signal, for scanning a recording medium, and for recording the information, a device for detecting a signal indicative of a positional error between the light beam spot and the medium in at least one of a focusing direction and a tracking direction, a servo device for correcting the positional error on the basis of the detected signal, a device for changing a gain of the servo in accordance with an intensity level of the light beam, and a device for delaying the gain by a predetermined time corresponding to a time period for a change in the level of the input signal from a higher level to a lower level.
    • 根据本发明的光信息记录装置防止放大器的输出的饱和,从而实现稳定的跟踪和/或聚焦伺服。 记录装置包括用于输入在至少两个级别之间调制的输入信号的装置,这两个电平根据记录信息不为零;一种装置,用于将至少两个不为零的两个电平之间调制的光束强度会聚在一个点状 根据输入信号的形状,用于扫描记录介质,并且用于记录信息,用于在聚焦方向和跟踪中的至少一个中检测指示光束光斑和介质之间的位置误差的信号的装置 方向,用于基于检测信号校正位置误差的伺服装置,根据光束的强度水平改变伺服的增益的装置,以及用于将增益延迟预定时间对应的装置 到用于将输入信号的电平从较高电平改变到较低电平的时间段。
    • 10. 发明授权
    • Laser driving device provided with two reference signal sources, and
optical information recording apparatus using the same device
    • 具有两个参考信号源的激光驱动装置和使用相同装置的光信息记录装置
    • US4967417A
    • 1990-10-30
    • US377131
    • 1989-07-10
    • Etsuo Yamada
    • Etsuo Yamada
    • G11B7/125H01S5/062H01S5/0683
    • H01S5/06832H01S5/06213
    • A laser driving device is disclosed. The laser driving device includes a semiconductor laser, a current source for supplying an electric current to the semiconductor laser, a photodetector for monitoring light emitted from the semiconductor laser, a plurality of setting circuits for outputting reference signals of different levels, a switching circuit for selecting one of the outputs of the setting circuits, a comparing circuit for comparing the output selected by the switching circuit with the output of the photodetector, and a control circuit for controlling the electric current supplied to the semiconductor laser on the basis of the output of the comparing circuit so that the two outputs become equal to each other. Also disclosed is an optical information recording apparatus using such a laser driving device.
    • 公开了一种激光驱动装置。 激光驱动装置包括半导体激光器,用于向半导体激光器提供电流的电流源,用于监视从半导体激光器发射的光的光电检测器,用于输出不同电平的参考信号的多个设置电路,用于 选择所述设置电路的输出之一,比较电路,用于将由所述开关电路选择的输出与所述光电检测器的输出进行比较;以及控制电路,用于根据所述输出来控制提供给所述半导体激光器的电流 比较电路使得两个输出彼此相等。 还公开了使用这种激光驱动装置的光信息记录装置。