公开(公告)号：US09761263B2

公开(公告)日：2017-09-12

申请号：US14651016

申请日：2012-12-12

Applicant: Hitachi Consumer Electronics Co., Ltd.

Inventor： Hirofumi Taguchi ,  Koji Fujita ,  Nobuo Nakai ,  Koichiro Nishimura ,  Taku Hoshizawa ,  Kazuyoshi Yamazaki

IPC: G11B7/24 ,  G11B7/0065 ,  G11B7/127 ,  G11B7/1395 ,  G11B7/1381

CPC classification number: G11B7/0065 ,  G11B7/127 ,  G11B7/1381 ,  G11B7/1395

Abstract: An optical information recording and reproducing device that records information on a recording medium and/or reproduces information on the recording medium, using holography is configured to include a laser light source that performs irradiation with laser light, a first light-shielding portion which is capable of switching between transmission and shielding of laser light emitted from the laser light source, and a driving circuit that drives the switching between transmission and shielding of the first light-shielding portion, and a first movement portion that moves the first light-shielding portion.

公开(公告)号：US09786312B2

公开(公告)日：2017-10-10

申请号：US15022935

申请日：2013-09-18

Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.

Inventor： Kazuyoshi Yamazaki ,  Tatsuro Ide

IPC: G11B7/0065 ,  G11B7/005 ,  G11B7/08 ,  G11B7/1381 ,  G11B7/007 ,  G11B7/24 ,  G11B7/24044 ,  G11B7/09 ,  G11B7/0037 ,  G11B7/00 ,  G11B7/085 ,  G11B7/1365

CPC classification number: G11B7/0065 ,  G03H2222/31 ,  G11B7/0037 ,  G11B7/005 ,  G11B7/00772 ,  G11B7/083 ,  G11B7/08564 ,  G11B7/094 ,  G11B7/1365 ,  G11B7/1381 ,  G11B7/24 ,  G11B7/24044 ,  G11B2007/0009 ,  G11B2007/240025

Abstract: The purpose of the present invention is to provide a hologram reproducing apparatus and a hologram reproducing method, which are suitable for reproducing hologram. The purpose can be achieved by means of a hologram reproducing apparatus, which reproduces information signals by irradiating an optical information recording medium with reference light, and a hologram reproducing method for the hologram reproducing apparatus. The hologram reproducing apparatus is characterized in being provided with: a polarization conversion section, which converts polarization of diffracted light that is generated when the optical information recording medium is irradiated with the reference light; a light receiving section, which receives the diffracted light having the polarization thereof converted by means of the polarization conversion section; and a servo signal generating circuit section, which generates signals for moving the optical information recording medium or the polarization conversion section using the diffracted light received by means of the light receiving section.

公开(公告)号：US09508377B2

公开(公告)日：2016-11-29

申请号：US14781595

申请日：2013-04-05

Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.

Inventor： Kazuyoshi Yamazaki

IPC: G11B7/0065 ,  G11B7/09 ,  G03H1/26 ,  G11B7/085 ,  G11B7/1356 ,  G11B7/1353 ,  G11B20/18 ,  G11B7/0037 ,  G03H1/04 ,  G03H1/22

CPC classification number: G11B7/0065 ,  G03H1/265 ,  G03H2001/0491 ,  G03H2001/2244 ,  G11B7/0037 ,  G11B7/08564 ,  G11B7/094 ,  G11B7/1353 ,  G11B7/1356 ,  G11B20/18

Abstract: A hologram recording and reproducing device and an angular multiplexing recording and reproducing method capable of detecting an angular error signal for which, in a two-beam angle multiplexing method, high-speed reproducing can be achieved with a superior recovered signal. A branch element branches a light beam, emitted from a light source, into a signal light and a reference light. Angle-variable elements modify the incident angle of the reference light that is incident to the optical information recording medium. A spatial light modulator adds information to the signal light; and an objective lens radiates the signal light to the optical information recording medium. An imaging element detects diffracted light generated from a recording region when the reference light is radiated upon the optical information recording medium; a detection system detects at least two angular error signals for controlling the angle-variable elements; and switching is performed between the two angular error signals.

Abstract translation: 一种全息图记录和再现装置以及能够检测角度误差信号的角度多路复用记录和再现方法，其以双光束角度多路复用方式可以以优异的恢复信号实现高速再现。 分支元件将从光源发射的光束分散成信号光和参考光。 角度可变元件改变入射到光学信息记录介质的参考光的入射角。 空间光调制器将信息添加到信号光; 并且物镜将信号光辐射到光学信息记录介质。 当参考光被照射到光学信息记录介质上时，成像元件检测从记录区域产生的衍射光; 检测系统检测至少两个角度误差信号以控制角度可变元件; 并且在两个角度误差信号之间进行切换。

公开(公告)号：US20150131424A1

公开(公告)日：2015-05-14

申请号：US14400669

申请日：2012-05-23

Applicant: HITACHI CONSUMER ELECTRONICS CO., LTD.

Inventor： Makoto Hosaka ,  Kazuyoshi Yamazaki

IPC: G11B7/0065

CPC classification number: G11B7/0065 ,  G03H1/0486 ,  G11B7/1267

Abstract: An optical information recording/reproduction device appropriately adjusting a recording condition and a method and a medium therefor are provided in order to cope with a problem that the signal-to-noise ratio (SNR) during reproduction decreases, unless the condition during recording is adjusted, because of variation in the environment during recording, variation of components such as laser output, variation of production of the device, and the like in the optical information recording/reproduction device using holography. In an optical information recording/reproduction device configured to record or reproduce information to an optical information recording medium by using holography, a recording condition is adjusted, before user data are recorded, in an adjustment area provided for recording condition adjustment in an optical information recording medium.

Abstract translation: 提供了适当调整记录条件的光信息记录/再现装置及其方法和介质，以便应对在再现期间的信噪比（SNR）减小的问题，除非调整记录期间的条件 由于记录中的环境变化，使用全息术的光学信息记录/再现装置中的诸如激光输出的部件的变化，装置的生产变化等。 在被配置为通过使用全息术向光学信息记录介质记录或再现信息的光学信息记录/再现设备中，在用户数据被记录之前将记录条件调整到在光学信息记录中用于记录条件调整的调整区域中 中。