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    • 2. 发明授权
    • Displacement detecting device for optical head
    • 光头位移检测装置
    • US5715219A
    • 1998-02-03
    • US651508
    • 1996-05-22
    • Tadashi TakedaKenji FukuiRicardo Musashi OkamotoHiroyuki Wada
    • Tadashi TakedaKenji FukuiRicardo Musashi OkamotoHiroyuki Wada
    • G11B7/09G11B7/13G11B7/135
    • G11B7/094G11B7/131G11B7/1353G11B7/0943
    • A displacement detecting device for optical head is disclosed which is capable of stably generating displacement detecting signals without being affected by fluctuation of wavelength of light emitted from a light source. The displacement detecting device is provided for use in an optical head which comprises a optical sensor for reading information recorded on an optical information recording medium by irradiating the optical information recording medium with light from a light source and detecting reflected light from the irradiated surface of the recording medium as well as detecting focus displacement and track displacement by utilizing diffracted light of the reflected light. The optical sensor is provided with wavelength fluctuation component detector for detecting wavelength fluctuation components in the reflected light. At least one of a focus displacement detecting signal and a track displacement detecting signal is compensated for based on a wavelength fluctuation detecting signal generated by the wavelength fluctuation component detector, thereby enabling the displacement detection to be stably performed without being affected by fluctuation of the wavelength of light emitted from a light source.
    • 公开了一种用于光头的位移检测装置,其能够稳定地产生位移检测信号,而不受来自光源的光的波长的波动的影响。 该位移检测装置用于光学头,该光学头包括光学传感器,该光学传感器用于通过用来自光源的光照射光学信息记录介质并检测来自光源的照射表面的反射光来读取记录在光学信息记录介质上的信息 记录介质以及通过利用反射光的衍射光来检测聚焦位移和轨迹位移。 光学传感器设置有用于检测反射光中的波长波动成分的波长波动成分检测器。 基于由波长波动成分检测器生成的波长波动检测信号,补偿焦点位移检测信号和轨道位移检测信号中的至少一个,从而能够稳定地进行位移检测而不受波长波动的影响 从光源发出的光。
    • 9. 发明申请
    • Memory card device, rights managing system and time managing method
    • 存储卡设备,权限管理系统和时间管理方法
    • US20050038757A1
    • 2005-02-17
    • US10902822
    • 2004-08-02
    • Hiroyuki Wada
    • Hiroyuki Wada
    • G04C9/04G04G5/00G04G99/00G06F12/00G06F12/14G06F13/00G06F21/24G06F21/62G06F21/64G07F17/00G06F17/60
    • G06F21/725G06F21/10G06F2221/0797G06Q10/105G06Q30/0283
    • A rental service handling electronic data is faced with a challenge of accurately managing time within a machine. With currently available systems, time instant data to be set could be tampered using a machine and it is therefore difficult to protect the rights over programs and data. Disposed within a memory card are a time measuring part which is capable of measuring time, a memory part in which key information and various types of data are coded and stored, a power source part which supplies power to the time measuring part and other respective parts, a code processing part which decodes time instant information set in the time measuring part and codes time instant information retrieved from the time measuring part using the key information, and a calculation control part which controls so as to validate or invalidate rights based on the various types of time instant information, whereby management of time such as the term of validity of data is always performed inside the memory card.
    • 处理电子数据的租赁服务面临着准确管理机器内部时间的挑战。 使用当前可用的系统,可以使用机器篡改要设置的即时即时数据,因此难以保护对程序和数据的权限。 在存储卡内设置有能够测量时间的时间测量部分,其中密钥信息和各种类型的数据被编码和存储的存储器部分,向时间测量部分和其他各个部分供电的电源部分 代码处理部,其对所述时间测量部中设定的时刻信息进行解码,并且使用所述密钥信息对从所述时间测量部检索到的时刻信息进行编码;以及计算控制部,其基于各种方式来控制以使所述权限有效或无效 时间瞬间信息的类型,从而总是在存储卡内部执行诸如数据有效期的时间的管理。