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    • 111. 发明授权
    • Rotary encoder
    • 旋转编码器
    • US07825367B2
    • 2010-11-02
    • US12093818
    • 2006-08-25
    • Yutaka NakamuraSatoshi Yanobe
    • Yutaka NakamuraSatoshi Yanobe
    • G01D5/34
    • G01D5/24495G01D5/24452G01D5/2448
    • [Problems to be Solved] To provide a rotary encoder capable of carrying out self-calibration for a horizontal encoder as well as a vertical encoder without requiring special equipment and simply and inexpensively with a high degree of accuracy while reducing the burden on a worker.[Means for Solving the Problems] In a rotary encoder including: a rotary disk (1) with an angle code (11); a light source that irradiates the angle code; a CCD linear sensor (3) that reads the angle code; and a processing unit that acquires a reading value f(θ) based on the angle code read by the CCD linear sensor, every time the rotary disk is rotated by a predetermined angle, where a rotation angle of the rotary disk is provided as θ and an angle from the rotation angle θ is provided as φ, based on a change in a difference g(θ,φ) between reading values f(θ+φ) and f(θ) within a reading range on the CCD linear sensor, the difference g(θ,φ) is determined as a Fourier series, and self-calibration of the reading value f(θ) of 0 to 360° is carried out based on the result.
    • [待解决的问题]提供一种能够对水平编码器和垂直编码器进行自校准的旋转编码器,而不需要专门的设备,并且在降低工作人员的负担的情况下,以简单且廉价的方式高精度地进行。 解决问题的手段在包括:具有角度代码(11)的旋转盘(1)的旋转编码器中, 照射角码的光源; 读取角度代码的CCD线性传感器(3); 以及处理单元,每当旋转盘旋转预定角度时,基于由CCD线性传感器读取的角度代码来获取读取值f(& tt),其中旋转盘的旋转角度被设置为& ; 并且与旋转角度和角度成一角度; 基于CCD线性传感器读取范围内的读取值f(& t + s +&phgr;)和f(&thetas;)之间的差异g(& tt;,&phgr)的差异,被提供为&phgr; g(&thetas;,&phgr))被确定为傅立叶级数,并且基于该结果执行0至360°的读取值f(& s)的自校准。
    • 113. 发明授权
    • Digital content protection system
    • 数字内容保护系统
    • US07707430B2
    • 2010-04-27
    • US11857389
    • 2007-09-18
    • Makoto TatebayashiYutaka NakamuraShunji HaradaMasayuki Kozuka
    • Makoto TatebayashiYutaka NakamuraShunji HaradaMasayuki Kozuka
    • H04L9/32H04L9/00
    • G11B20/00086G06F21/10G06F2221/0797G11B20/00188G11B20/00195G11B20/0021G11B20/00253G11B20/00413G11B20/00507G11B20/00528
    • The media inherent key storing unit 220 prestores an inherent key Ki, the conversion unit 230 generates an encrypted inherent key Ji from the inherent key read from the media inherent key storing unit 220, the random number generating unit 331 generates a random number R1, the encryption unit 252 generates an encrypted random number S1, the decryption unit 333 generates a random number R′1 from the encrypted random number R1, and the mutual authentication control unit 334 compares the random number R′1 with the random number R1 and, if the random number R′1 matches the random number R1, judges that the memory card 200 is an authorized device. If the memory card 200 and the memory card writer have successfully authenticated each other, the memory card writer encrypts a content using a decrypted inherent key. If the memory card 200 and the memory card reader have successfully authenticated each other, the memory card reader decrypts an encrypted content using the decrypted inherent key.
    • 媒体固有密钥存储单元220预先存储固有密钥Ki,转换单元230从从媒体固有密钥存储单元220读取的固有密钥生成加密固有密钥Ji,随机数生成单元331生成随机数R1, 加密单元252生成加密的随机数S1,解密单元333从加密的随机数R1生成随机数R'1,并且相互认证控制单元334将随机数R'1与随机数R1进行比较,如果 随机数R'1与随机数R1匹配,判断存储卡200是授权装置。 如果存储卡200和存储卡写卡器已成功认证,则存储卡写入器使用解密的固有密钥加密内容。 如果存储卡200和存储卡阅读器已经成功地认证了彼此,则存储卡读卡器使用解密的固有密钥来解密加密的内容。
    • 119. 发明授权
    • Method of detecting position of head for recording medium
    • 检测记录介质头部位置的方法
    • US07397627B2
    • 2008-07-08
    • US11141686
    • 2005-05-31
    • Takahiro ImamuraArata EjiriYutaka NakamuraKen-ichi Itoh
    • Takahiro ImamuraArata EjiriYutaka NakamuraKen-ichi Itoh
    • G11B5/596
    • B82Y10/00G11B5/743G11B5/746G11B5/82
    • A head is moved in a lateral direction on the boundary between a separation track and a recording track on a recording medium. The separation track isolates the adjacent recording tracks from each other. A variation is detected in the output supplied from the head based on the recording track. Positional information indicating the position of the head is generated based on the variation. The output supplied from the head varies in response to the movement in the lateral direction, namely the elapsed time. The positional information can thus be generated based on the variation in the output. The generated positional information contributes to an accurate positioning in a facilitated manner. Moreover, information required to position the head can be omitted from the recording medium. The processes can be simplified in the production of the recording medium. The operation time can thus be shortened.
    • 头部在记录介质上的分离轨道和记录轨迹之间的边界上沿横向方向移动。 分离轨道将相邻的记录轨道彼此隔离。 在基于记录轨道从头部提供的输出中检测到变化。 基于该变化生成表示头部的位置的位置信息。 从头部输出的输出根据横向的运动,即经过的时间而变化。 因此,可以基于输出的变化来生成位置信息。 所产生的位置信息有助于以便利的方式进行精确的定位。 此外,可以从记录介质中省略定位头部所需的信息。 可以简化记录介质的生产过程。 因此可以缩短操作时间。