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    • 71. 发明申请
    • WAVELENGTH DETECTOR, WAVELENGTH STABILIZATION LASER DEVICE, AND IMAGE DISPLAY DEVICE
    • 波长检测器,波长稳定激光器件和图像显示器件
    • US20080225911A1
    • 2008-09-18
    • US12048561
    • 2008-03-14
    • Kenji NAKAYAMAShinichi Kadowaki
    • Kenji NAKAYAMAShinichi Kadowaki
    • H01S3/13G01J3/45
    • G01J1/4228G01J1/04G01J1/0407G01J1/0437G01J1/0448G01J9/00G02F1/1336H01S5/0687
    • A wavelength detector capable of distinguishing between the changes of a transverse mode and of a longitudinal mode of a laser light and thus detecting the change of the wavelength of the laser light with high accuracy is provided. In a wavelength detector 13: a diffraction grating 16 diffracts a laser light emerging from a laser light source 10; photodetectors 50a and 50b are positioned symmetrically with respect to a 0-order diffracted light diffracted by the diffraction grating 16; and light incidence surfaces 51a and 51b of the photodetectors 50a and 50b, respectively, have the same shape and are each divided into a plurality of areas. The wavelength detector 13 detects the change of the wavelength of the laser light based on a value obtained by dividing the difference value between the sum of light intensities measured by all of the plurality of divided areas of the photodetector 50a and the sum of light intensities measured by all of the plurality of divided areas of the photodetector 50b, by the sum of light intensities measured by all of the plurality of divided areas of the two photodetectors 50a and 50b.
    • 提供能够区分横模的变化和激光的纵向模式并因此以高精度检测激光的波长的变化的波长检测器。 在波长检测器13中:衍射光栅16衍射从激光光源10出射的激光; 光电检测器50a和50b相对于由衍射光栅16衍射的0级衍射光对称地定位; 并且光电检测器50a和50b的光入射表面51a和51b分别具有相同的形状并且被分成多个区域。 波长检测器13基于通过将由光检测器50a的所有多个分割区域测量的光强度的总和与测量的光强度之和之间的差值除以获得的值来检测激光的波长的变化 由光检测器50b的多个分割区域的全部由两个光电检测器50a和50b的所有多个分割区域测量的光强度的总和。
    • 72. 发明授权
    • Focusing-error detecting apparatus with a simple photodetector unit for
use in an optical recording/reproducing device
    • 用光学记录/再现设备使用简单的光电转换单元的聚焦错误检测装置
    • US5144606A
    • 1992-09-01
    • US762989
    • 1991-09-20
    • Shinichi Kadowaki
    • Shinichi Kadowaki
    • G02B7/28G03B13/36G11B7/09G11B7/13
    • G11B7/131G11B7/0912
    • A light source emits a light beam. A focusing optical system focuses the light beam on an information recording medium. First and second strip-shape photodetectors approximately extend on a common plane. First and second return light beams are generated on the basis of a light beam reflected and diffracted back from the medium. The return light beams have different focal points. Centers of the return light beams are received by the photodetectors respectively. The focal points of the first and second return light beams lie at a front side and a rear side of light-receiving surfaces of the first and second photodetectors respectively when sizes of the return light beams on the light-receiving surfaces of the photodetectors are equal. A focusing-error signal is generated in response to a difference between output signals from the first and second photodetectors. The first and second photodetectors extend approximately in parallel. The first and second photodetectors have approximately equal widths which agree with a value W.sub.x. A distance "d" between centers of the first and second return light beams on the first and second photodetectors is equal to or smaller than a sum of a value D and the value W.sub.x which is measured along a direction parallel to a line connecting the centers of the first and second return light beams. The value D is equal to diameters of the first and second return light beams on the first and second photodetectors when the diameters of the first and second return light beams on the first and second photodetectors are equal.
    • 74. 发明申请
    • DISPLAY DEVICE
    • 显示设备
    • US20120013720A1
    • 2012-01-19
    • US13181805
    • 2011-07-13
    • Shinichi KadowakiShinichi Shikii
    • Shinichi KadowakiShinichi Shikii
    • H04N13/04
    • G02B27/26H04N13/315
    • A display device is provided with an image display portion for temporally switching a left frame image to be viewed by a left eye, and a right frame image to be viewed by a right eye to emit video light so that a video is stereoscopically perceived; a light deflector for deflecting the video light emitted from the image display portion; and a controller for controlling the light deflector to adjust a deflection direction of the video light output from the light deflector. The image display portion changes polarization characteristics of the video light area by area, and the light deflector deflects the video light in response to the polarization characteristics so that the video light of the left frame image is incident to the left eye and the video light of the right frame image is incident to the right eye.
    • 显示装置设置有用于时间切换左眼观看的左帧图像的图像显示部分和由右眼观看的右帧图像以发射视频光,使得视频被立体感知; 光偏转器,用于偏转从图像显示部分发射的视频光; 以及控制器,用于控制所述光偏转器,以调节从所述光偏转器输出的视频光的偏转方向。 图像显示部分改变视频光区域的偏振特性,并且光偏转器响应于偏振特性偏转视频光,使得左帧图像的视频光入射到左眼,并且视频光 正确的帧图像会发生在右眼。
    • 77. 发明授权
    • Optical pick-up head apparatus wherein hollographic optical element and
photodetector are formed on semiconductor substrate
    • 其中全息光学元件和光电探测器形成在半导体衬底上的光学拾取头装置
    • US5293038A
    • 1994-03-08
    • US35777
    • 1993-03-23
    • Shinichi KadowakiYoshiaki KommaSeiji Nishino
    • Shinichi KadowakiYoshiaki KommaSeiji Nishino
    • G11B7/085G11B7/09G11B7/12G11B7/135H01J3/14
    • G11B7/1353G11B7/123
    • An optical pick-up head apparatus to be used for recording and reproducing or erasing optical information on and from an optical storage medium. The head apparatus comprises a semiconductor laser source, a reflector, a reflection type holographic optical element and a photodetector. A laser beam emitted from the semiconductor laser source is incident through the reflector on the reflection type holographic optical element so as to be incident through an objective lens on the optical storage medium. The laser beam reflected and diffracted on the optical storage medium advances along the same path in the opposite direction to be incident on the reflection type holographic optical element to become diffraction beams. The diffraction beams are incident on the photodetector after being reflected on the reflector so as to obtain a focusing error signal, tracking error signal and information signal. The reflection type holographic optical element and the photodetector are formed on one semiconductor substrate, and the semiconductor laser source is disposed to be close to the photodetector on the semiconductor substrate. Due to this arrangement, the head apparatus can easily and accurately be assembled without the positional adjustment of the reflection type holographic optical element or the photodetector, thereby improving the mass productivity of the head apparatus.
    • 一种用于在光学存储介质上记录和再现或擦除光学信息的光学拾取头装置。 头装置包括半导体激光源,反射器,反射型全息光学元件和光电检测器。 从半导体激光源发射的激光束通过反射型入射到反射型全息光学元件上,从而通过光学存储介质上的物镜入射。 在光存储介质上反射和衍射的激光束沿相反方向前进,入射到反射型全息光学元件上,成为衍射光束。 衍射光束在反射器上反射后入射到光电检测器上,以获得聚焦误差信号,跟踪误差信号和信息信号。 反射型全息光学元件和光电检测器形成在一个半导体衬底上,并且半导体激光源设置成靠近半导体衬底上的光电检测器。 由于这种布置,头部装置可以容易且准确地组装而不需要反射型全息光学元件或光电检测器的位置调整,从而提高了头部装置的批量生产率。