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    • 54. 发明授权
    • Optical element, optical control method and device using this optical element, and method of manufacturing optical element
    • 光学元件,使用该光学元件的光学控制方法和装置以及光学元件的制造方法
    • US06452710B1
    • 2002-09-17
    • US09485058
    • 2000-02-03
    • Takashi HiragaTetsuo MoriyaNorio TanakaHiromitsu YanagimotoIchiro UenoKoji Tsujita
    • Takashi HiragaTetsuo MoriyaNorio TanakaHiromitsu YanagimotoIchiro UenoKoji Tsujita
    • G02F103
    • G02F1/293G02F1/0147
    • An optical element, optical control device and optical control method are provided which demonstrate a large, rapid optical response using a laser light of low output as a control light. A signal light 1 is emitted from an optical source 1. A signal light 2 emitted from an optical source 2. A control light and the signal light are converged by a condenser lens 7, and irradiate an optical element 8. Only the signal light is detected by a photodetector 22 through a light receiving lens 9 and a wavelength selection filter 20. A thermal lens is formed reversibly in the optical element and switching the control light ON and OFF modulates the intensity of the signal light. The optical element has a laminar structure comprising a heat transfer film/heat insulation film/light absorption film/heat insulation film/heat transfer film, for example, and a sufficiently large and rapid optical response is obtained using low output laser light as the control light by adjusting the thickness of the light absorption film so that it does not exceed twice the confocal length of the converged control light.
    • 提供了一种光学元件,光学控制装置和光学控制方法,其显示了使用低输出的激光作为控制光的大而快速的光学响应。 从光源1发射信号光1.从光源2发射的信号光2.控制光和信号光由聚光透镜7会聚,并照射光学元件8.只有信号光是 通过光接收透镜9和波长选择滤光器20由光电检测器22检测。热透镜在光学元件中可逆地形成,并且控制灯的ON和OFF切换调制信号光的强度。 例如,光学元件具有包括传热膜/隔热膜/光吸收膜/隔热膜/传热膜的层状结构,并且使用低输出激光作为控制来获得足够大且快速的光学响应 通过调节光吸收膜的厚度使得其不超过会聚控制光的共焦长度的两倍。
    • 56. 发明授权
    • SIGNAL GENERATION METHOD, SIGNAL GENERATION METHOD USED IN OPTICAL DISK RECORDING AND REPRODUCING APPARATUS, OPTICAL PICK-UP USING SIGNAL GENERATION METHOD, AND OPTICAL DISK RECORDING AND REPRODUCING APPARATUS HAVING THIS OPTICAL PICK-UP
    • 信号生成方法,用于光盘记录和再现装置的信号生成方法,使用信号生成方法的光学拾取,以及具有该光学拾取的光盘记录和再现装置
    • US06388963B1
    • 2002-05-14
    • US09329088
    • 1999-06-09
    • Norio Tanaka
    • Norio Tanaka
    • G11B700
    • G11B7/0903G11B7/00718G11B7/08517G11B7/08541G11B7/094G11B7/0943G11B7/24079
    • A signal generation method capable of generating a cross track signal having a predetermined phase difference from a tracking error signal even in a land and groove recording method in which a land width and a groove width are made equal, wherein a main spot is detected at a split photodetector, a first side spot is detected at a split photodetector, and a second side spot is detected at a split photodetector; a first error is calculated as an error of the optical disk in a radial direction from four detection signals detected at the photodetector, a second error is calculated as the error of two detection signals of the photodetector, a third error is calculated as the error of two detection signals of the third photodetector, and the sum of the second and third errors is subtracted from the first error to calculate a tracking error signal; and a difference between the second error and the third error is found to calculate a cross track signal having a phase shifted by 90° from the tracking error signal TE.
    • 一种能够产生具有与跟踪误差信号具有预定相位差的交叉轨道信号的信号产生方法,即使在使槽脊宽度和槽宽相等的陆地和凹槽记录方法中,其中在 在分离光电检测器处检测到第一侧光点,并在分离光电检测器处检测第二侧光斑; 根据在光检测器处检测到的四个检测信号,将径向的光盘的误差计算为第一误差,将第二误差计算为光检测器的两个检测信号的误差,将第三误差计算为 从第一误差中减去第三光电检测器的两个检测信号和第二误差和第三误差的和,以计算跟踪误差信号; 并且发现第二误差和第三误差之间的差异来计算具有从跟踪误差信号TE相移90°的交叉轨迹信号。
    • 59. 发明授权
    • Apparatus for recording video signals within recording tracks extending
obliquely across a magnetic tape
    • 用于将记录轨道中的视频信号倾斜地横过磁带的装置
    • US5506688A
    • 1996-04-09
    • US368393
    • 1995-01-03
    • Takato NaritaNorio Tanaka
    • Takato NaritaNorio Tanaka
    • G11B5/008G11B5/02G11B5/09G11B15/18G11B15/467H04N5/7826H04N5/919H04N5/92H04N5/926H04N9/79H04N5/782
    • G11B5/00865G11B15/1875G11B15/4673H04N5/919H04N5/78263H04N5/9203H04N5/926
    • In an apparatus for recording video signals within recording tracks extending obliquely across a magnetic tape, having a rotary drum with first and second pairs of heads spaced from each other pair by a distance corresponding to one track pitch in a direction parallel to the axis of the rotary drum for recording video signals simultaneously on two recording tracks, while sequentially recording video signals on the magnetic tape within the recording tracks the video signals are recorded on said magnetic tape for longer than at the time of normal recording in such a manner that one of the two recording tracks on which the video signals are recorded by one of the second pair of heads overlaps part of the other recording track which is next to the one recording track and on which the video signals are recorded by one of said first pair of heads, so that by controlling the moving speed of the moving means in such a way so as to be slower than the normal moving speed at the time of normal recording, reductions in the signal to noise ratio can be avoided, and effective long time period recording can be achieved.
    • 在用于将记录轨道中的视频信号记录在倾斜地跨越磁带的记录轨道中的装置中,具有旋转磁鼓,该旋转磁鼓具有第一和第二对磁头,该第一和第二对磁头在平行于 用于在两个记录轨道上同时记录视频信号的旋转磁鼓,同时在记录轨道中的磁带上顺序地将视频信号记录在所述磁带上的时间长于正常记录时间, 其中视频信号由第二对头中的一个记录的两个记录道与另一个记录道的一部分重叠,该另一个记录道与该一个记录道相邻,并且其中视频信号由所述第一对头中的一个记录 ,使得通过以这样的方式控制移动装置的移动速度使其比正常重放时的正常移动速度慢 可以避免信号噪声的降低,可以实现有效的长时间记录。