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    • 7. 发明授权
    • Optical disk drive and method for counting the number of tracks on an
optical disk
    • 光盘驱动器和计数光盘上的轨道数的方法
    • US5199017A
    • 1993-03-30
    • US757775
    • 1991-09-11
    • Naoyuki KagamiHiroaki KuboKeiichi Okada
    • Naoyuki KagamiHiroaki KuboKeiichi Okada
    • G11B7/085
    • G11B7/08541
    • The invention is a positive peak level comparator for generating a positive peak pulse when a TES (Tracking Error Signal) is higher than a predetermined positive level, a negative peak level comparator for generating a negative peak pulse when the TES is lower than a predetermined negative level, and a logic circuit for generating an output pulse when said positive peak pulse and said negative peak pulse have been alternately input thereto. The arrangement prevents the TES from being miscounted even if the TES is distrubed due to the occurrence of, for example, a noise at a level close to either said predetermined positive level or said predetermined negative level and either said peak pulse or said negative pulse is successively generated.
    • 本发明是一个正峰值电平比较器,用于当TES(跟踪误差信号)高于预定的正电平时产生正峰值脉冲,当TES低于预定的负电平时产生负峰值脉冲的负峰值电平比较器 以及用于当所述正峰值脉冲和所述负峰值脉冲已被交替地输入时产生输出脉冲的逻辑电路。 即使由于发生例如接近于所述预定正电平或所述预定负电平的电平的噪声而导致TES被分配,并且所述峰值脉冲或所述负脉冲是 先后产生。
    • 10. 发明授权
    • Detection system and detection method of document size for use in a
document reader
    • 文档读取器中使用的文档大小的检测系统和检测方法
    • US5519483A
    • 1996-05-21
    • US88682
    • 1993-07-09
    • Shinya KawanishiKouichi FurutaKeiichi Okada
    • Shinya KawanishiKouichi FurutaKeiichi Okada
    • G03G15/00G03G21/00
    • G03G15/607
    • A light-emitting elements emits a light beam onto a predetermined sensing position, and a reflected beam from an original is received by a light-receiving element. The light-receiving element, which is a position sensitive detector for detecting a spot position of the reflected beam, releases a pair of currents that vary according to the spot position. A signal processing circuit detects the presence or absence of the original based on the ratio of the currents. The pair of currents released by the light-receiving element fluctuate in response to changes in reflection factor due to the individual color of the original, while the ratio of the pair of currents does not fluctuate even if the reflection factor changes. Thus, detection accuracy is improved, and erroneous detection can be prevented in comparison with an arrangement wherein the presence or absence of the original is detected by detecting and comparing the amount of light.
    • 发光元件将光束发射到预定感测位置,并且来自原稿的反射光束被光接收元件接收。 作为用于检测反射光束的光点位置的位置敏感检测器的光接收元件释放根据光点位置而变化的一对电流。 信号处理电路基于电流的比例检测原稿的存在或不存在。 受光元件释放的一对电流由于原稿的单独颜色而响应于反射因​​数的变化而波动,而即使反射因子改变,一对电流的比率也不会波动。 因此,与通过检测和比较光量来检测原稿的存在或不存在的布置相比,提高了检测精度,并且可以防止错误检测。