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    • 85. 发明授权
    • Wavelength detector, wavelength stabilization laser device, and image display device
    • 波长检测器,波长稳定激光装置和图像显示装置
    • US07630426B2
    • 2009-12-08
    • US12048561
    • 2008-03-14
    • Kenji NakayamaShinichi Kadowaki
    • Kenji NakayamaShinichi Kadowaki
    • H01S3/08
    • G01J1/4228G01J1/04G01J1/0407G01J1/0437G01J1/0448G01J9/00G02F1/1336H01S5/0687
    • A wavelength detector detecting a change of a wavelength of a laser light with high accuracy, such that the wavelength detector includes a diffraction grating diffracting a laser light, photodetectors positioned symmetrically with respect to a 0-order diffracted light diffracted by the diffraction grating, and respective light incidence surfaces of the photodetectors that have a same shape and that are divided into a plurality of areas. The wavelength detector detects the change of the wavelength based on a value obtained by dividing a difference between (i) a sum of light intensities measured by all of the plurality of divided areas of a first photodetector and (ii) a sum of light intensities measured by all of the plurality of divided areas of a second photodetector, by a sum of light intensities measured by all of the plurality of divided areas of both photodetectors.
    • 波长检测器以高精度检测激光的波长变化,使得波长检测器包括衍射激光的衍射光栅,相对于由衍射光栅衍射的0级衍射光对称定位的光电检测器,以及 具有相同形状且被分成多个区域的光电检测器的各个光入射面。 波长检测器基于通过划分(i)由第一光电检测器的所有多个分割区域测量的光强度的总和和(ii)测量的光强度的总和之间的差异而获得的值来检测波长的变化 通过由两个光电检测器的所有多个分割区域测量的光强度的总和,由第二光电检测器的多个分割区域的全部。
    • 86. 发明授权
    • Optical pickup head wherein an error signal is produced by detecting a
phase difference in diffraction beams from a holographic optical element
    • 光拾取头,其中通过检测来自全息光学元件的衍射光束的相位差产生误差信号
    • US5293367A
    • 1994-03-08
    • US669548
    • 1991-03-14
    • Shinichi KadowakiYoshiaki KommaNaoyasu Miyagawa
    • Shinichi KadowakiYoshiaki KommaNaoyasu Miyagawa
    • G11B7/09G11B7/12G11B7/125G11B7/13G11B7/135
    • G11B7/127G11B7/123G11B7/131G11B7/1353
    • A light source emits a light beam which is focused on an optical recording medium. The light beam is reflected and diffracted by the optical recording medium. A holographic optical element has divided regions formed with different holographic patterns. The divided regions of the holographic optical element diffract the light beam reflected and diffracted by the optical recording medium, and thereby generate diffraction light beams respectively. The divided regions of the holographic optical element lie in quadrants of an imaginary X-Y coordinate system respectively. An X axis of the coordinate system extends in a direction corresponding to a direction of a pit sequence on the optical recording medium, that is, a tangential direction of the optical recording medium. A Y axis of the coordinate system extends in a direction corresponding to a direction perpendicular to the direction of the pit sequence, that is, a radial direction of the optical recording medium. Photodetectors receive the diffraction light beams generated by the divided regions of the holographic optical element, and convert the received diffraction light beams into corresponding electric signals. Phases of the electric signals are compared, and a tracking error signal is generated on the basis of a result of the phase comparison.
    • 光源发射聚焦在光学记录介质上的光束。 光束被光记录介质反射和衍射。 全息光学元件具有由不同全息图形成的分割区域。 全息光学元件的分割区域衍射由光记录介质反射和衍射的光束,从而分别产生衍射光束。 全息光学元件的分割区域分别位于虚拟X-Y坐标系的象限中。 坐标系的X轴在与光记录介质上的凹坑序列的方向对应的方向上延伸,即光记录介质的切线方向。 坐标系的Y轴在与垂直于凹坑序列方向(即光记录介质的径向)的方向相对应的方向上延伸。 光检测器接收由全息光学元件的分割区域产生的衍射光束,并将接收的衍射光束转换成相应的电信号。 比较电信号的相位,并且基于相位比较的结果生成跟踪误差信号。