公开(公告)号：US20030039196A1

公开(公告)日：2003-02-27

申请号：US10212164

申请日：2002-08-06

Applicant: Minebea Co., Ltd.

Inventor： Mizuki Nakamura ,  Atsushi Kitamura ,  Kozo Matsumoto

IPC: G11B007/00 ,  G11B007/135

CPC classification number: G11B7/1381 ,  G11B7/1365 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: An information reading and recording apparatus includes a super-resolution cut-off filter having an annular metal reflection film at its center portion and disposed immediately before one of two objective lenses with a higher NA. When reading DVD, the one objective lens with a higher NA with the super-resolution cut-off filter disposed therebefore is positioned at the optical path. When reading CD, the other objective lens with a lower NA is positioned at the optical path. The laser beam reflected by a disk follows backward the incoming optical path to pass through a half mirror, and is received by a photodetector to be converted into an electrical signal.

Abstract translation: 信息读取和记录装置包括超分辨率截止滤光器，其在其中心部分具有环形金属反射膜，并且立即设置在具有较高NA的两个物镜之一之前。 当读DVD时，设置有超分辨率截止滤波器的具有较高NA的一个物镜位于光路上。 当读取CD时，具有较低NA的另一物镜位于光路。 由光盘反射的激光束沿着入射光路的后方穿过半反射镜，并被光电检测器接收以转换成电信号。

公开(公告)号：US20030090969A1

公开(公告)日：2003-05-15

申请号：US10290299

申请日：2002-11-08

Applicant: Minebea Co., Ltd.

Inventor： Kozo Matsumoto ,  Hideki Kato ,  Hideyoshi Horimai ,  Masaharu Kinoshita ,  Lim Pang-Boey

IPC: G11B007/00

CPC classification number: G11B7/0938 ,  G11B7/0065 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/0908

Abstract: An optical information recording device for recording information utilizing holography comprises a recording medium moving means for moving a recording medium, a follow-up control circuit for controlling an irradiation position, and a signal converting means for obtaining a reproduction signal from an address servo-control area including a light source for radiating an information beam and a reference beam onto the recording medium. The follow-up control circuit is composed of a binary-coding means for binary-coding the reproduction signal and a follow-up signal circuit, and detects the travel amount of the irradiation position moving means and generates, according to the travel amount detected and for a specific time during which the irradiation position of the information beam and the reference beam follows, an irradiation position control signal for controlling an irradiation position moving in one information recording area through an output terminal of a gain control amplifier.

Abstract translation: 用于利用全息术记录信息的光学信息记录装置包括用于移动记录介质的记录介质移动装置，用于控制照射位置的后续控制电路和用于从地址伺服控制获得再现信号的信号转换装置 区域包括用于将信息光束和参考光束照射到记录介质上的光源。 后续控制电路由用于二进制编码再现信号的二进制编码装置和后续信号电路组成，并且检测照射位置移动装置的移动量，并根据检测到的行驶量和 在信息光束和参考光束的照射位置跟随的特定时间，照射位置控制信号，用于通过增益控制放大器的输出端控制在一个信息记录区域中移动的照射位置。

公开(公告)号：US20030048737A1

公开(公告)日：2003-03-13

申请号：US10233468

申请日：2002-09-04

Applicant: MINEBEA CO., LTD.

Inventor： Mizuki Nakamura ,  Atsushi Kitamura ,  Kozo Matsumoto

IPC: G11B007/135

CPC classification number: G11B7/1362 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1365 ,  G11B2007/0006

Abstract: An optical pickup apparatus includes: one laser beam source for emitting two laser beams having respective optical paths parallel to each other and wavelengths different from each other; an optical-axis aligning means adapted to make the laser beams coaxial with each other; a collimating lens; a reflecting mirror; and an objective lens. A laser beam reflected at a high or low density disk takes the incoming path backward, passes through the optical-axis aligning means, is incident on a photo-detector, and converted thereby into an electrical signal. The optical-axis aligning means is structured such that one kind of dielectric multilayer film is formed on a transparent substrate, a transparent plate is attached on the one kind of dielectric multilayer film, and that another kind of dielectric multilayer film is formed on the transparent plate, and has its reflectance varied according to the wavelength of the laser beam.

Abstract translation: 一种光学拾取装置包括：一个激光束源，用于发射具有彼此平行的各个光路和彼此不同的波长的两个激光束; 适于使激光束彼此同轴的光轴对准装置; 准直透镜; 反射镜; 和物镜。 在高或低密度盘反射的激光束将入射路径向后，通过光轴对准装置，入射到光检测器上，从而转换为电信号。 光轴对准装置被构造为使得在透明基板上形成一种电介质多层膜，在一种电介质多层膜上安装透明板，并且在透明基板上形成另一种类型的电介质多层膜 并且其反射率根据激光束的波长而变化。

公开(公告)号：US20020084405A1

公开(公告)日：2002-07-04

申请号：US10026632

申请日：2001-12-27

Applicant: MINEBEA CO., LTD.

Inventor： Kozo Matsumoto ,  Atsushi Kitamura ,  Motoji Egawa

IPC: H01L027/00

CPC classification number: G11B7/139 ,  G11B7/123 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An information reading and recording apparatus in which recording media having respective recording densities different front each other, such as DVD, CD, CD-R/RW and the like, can be compatibly read and recorded only with a low-cost laser diode for low recording density. A laser beam from the laser diode is passed through a collimator lens via a half mirror, and there is provided a reflecting mirror for introducing the laser beam to one of two objective lenses, from which the laser beam is emitted towards the disk. One of the objective lenses is a lens having a high numerical aperture and the other one is a lens having a low numerical aperture. A super-resolution cut-off filter is disposed immediately before the objective lens having a high numerical aperture so that the objective lens and the super-resolution cut-off filter are placed in the optical path on reading DVD. On reading CD, the other lens is placed in the optical path. The laser beam reflected from the disk is received by a photo-detector for converting it into an electrical signal.

Abstract translation: 一种信息读取和记录装置，其中具有各自的记录密度彼此不同的记录介质（诸如DVD，CD，CD-R / RW等）的信息读取和记录装置可以仅与低成本的低成本激光二极管兼容地读取和记录 记录密度。 来自激光二极管的激光束经由半反射镜通过准直透镜，并且设置有用于将激光束引入两个物镜之一的反射镜，激光束从该物镜向盘发射。 其中一个物镜是具有高数值孔径的透镜，另一个是具有低数值孔径的透镜。 在具有高数值孔径的物镜之前立即设置超分辨率截止滤光器，使得物镜和超分辨率截止滤光器被放置在DVD上的光路中。 在阅读CD时，另一个镜头放置在光路中。 从光盘反射的激光束被光电检测器接收，以将其转换成电信号。

公开(公告)号：US20030053398A1

公开(公告)日：2003-03-20

申请号：US10241550

申请日：2002-09-12

Applicant: MINEBEA CO., LTD.

Inventor： Mizuki Nakamura ,  Atsushi Kitamura ,  Kozo Matsumoto ,  Motoji Egawa

IPC: G11B007/135

CPC classification number: G11B7/139 ,  G11B7/1365 ,  G11B7/1381 ,  G11B7/1395 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: A laser beam emitted from a laser diode and having a wavelength of 780 nm is S-polarized. A polarization plane rotating means (null/4 phase plate) is disposed between a super-resolution cut-off filter comprising a polarizing filter film and an objective lens. When reading on DVD, the objective lens, the polarization plane rotating means and the super-resolution cut-off filter in combination are set to the optical path. The S-polarized laser beam is focused to a micro spot diameter by super-resolution effects by the super-resolution cut-off filter together with the objective lens. Also, the S-polarized laser beam reflected at a disk and traveling backward along the incoming optical path is converted into a P-polarized laser beam while passing backward through the polarization plane rotating means. The P-polarized laser beam passes through the super-resolution cut-off filter without loss is received by a photo-detector.

Abstract translation: 从激光二极管发射并具有780nm波长的激光束是S偏振光。 在包括偏振滤光片和物镜的超分辨率截止滤光片之间设置极化面旋转装置（羔羊/ 4相位板）。 当在DVD上读取时，将物镜，偏振面旋转装置和超分辨率截止滤光器组合在一起设置为光路。 通过超分辨率截止滤光片与物镜的超分辨率效果将S偏光激光束聚焦到微光斑直径。 此外，在光盘反射并沿着入射光路向后移动的S偏振激光束在通过偏振面旋转装置的同时被转换成P偏振激光束。 P偏振激光束通过超分辨率截止滤光器，而不损失由光电检测器接收。

公开(公告)号：US20030007446A1

公开(公告)日：2003-01-09

申请号：US10184984

申请日：2002-07-01

Applicant: MINEBEA CO., LTD.

Inventor： Atsushi Kitamura ,  Kozo Matsumoto ,  Motoji Egawa

IPC: G11B007/135

CPC classification number: G11B7/1362 ,  G11B7/1365 ,  G11B7/1369 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: A liquid crystal element is provided as a polarization plane rotating means between a laser beam source and a beam splitter. Light emitted from the laser beam source passes through the liquid crystal element and the beam splitter, and is converted into parallel light by a collimating lens. The collimated light is incident on a first light-selection means, is reflected at a flat first reflecting surface or a concave second reflecting surface, and is then incident on a super-resolution cut-off filter as a second light-selection means. The light having passed through the second light-selection means is incident on an objective lens, and is converged onto a recording surface. The selection of the reflecting surface of the first light-selection means is determined based on an operation mode of the liquid crystal element.

Abstract translation: 液晶元件作为激光束源和分束器之间的偏振面旋转装置。 从激光束源发射的光通过液晶元件和分束器，并通过准直透镜转换为平行光。 准直光入射到第一光选择装置上，在平坦的第一反射表面或凹入的第二反射表面反射，然后作为第二光选择装置入射到超分辨率截止滤光器上。 已经穿过第二光选择装置的光入射到物镜上，并被会聚在记录表面上。 基于液晶元件的操作模式来确定第一光选择装置的反射表面的选择。

公开(公告)号：US20030053396A1

公开(公告)日：2003-03-20

申请号：US10243921

申请日：2002-09-16

Applicant: Minebea Co., Ltd.

Inventor： Mizuki Nakamura ,  Atsushi Kitamura ,  Kozo Matsumoto ,  Motoji Egawa

IPC: G11B007/135

CPC classification number: G11B7/1381 ,  G11B7/1367 ,  G11B7/139 ,  G11B7/1395 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: An optical pickup apparatus for reading and recording information on recording media includes a semiconductor laser, a collimating lens, a half mirror, a reflecting mirror, and an objective lens. Further included therein are a super-resolution cutoff filter and an aperture control filter, one of which is appropriately selected and set right before the objective lens by a filter switching-over device. When reading the DVD, the super-resolution cutoff filter is set at the optical path, whereas when reading the CD, the aperture control filter is set thereat. The filter switching device is arranged separately from an actuator driving system having the objective lens integrally structured therewith.

Abstract translation: 用于在记录介质上读取和记录信息的光学拾取装置包括半导体激光器，准直透镜，半反射镜，反射镜和物镜。 其中还包括超分辨率截止滤波器和孔径控制滤波器，其中一个被滤波器切换装置适当选择和设置在物镜之前。 当读取DVD时，超分辨率截止滤波器被设置在光路上，而当读取CD时，光圈控制滤波器被设置在那里。 滤波器开关装置与具有与其一体构成的物镜的致动器驱动系统分开配置。

公开(公告)号：US20030048704A1

公开(公告)日：2003-03-13

申请号：US10237686

申请日：2002-09-10

Applicant: Minebea Co., Ltd.

Inventor： Atsushi Kitamura ,  Kozo Matsumoto ,  Mizuki Nakamura ,  Motoji Egawa

IPC: G11B007/095 ,  G11B007/135

CPC classification number: B82Y10/00 ,  G11B7/0903 ,  G11B7/1365 ,  G11B7/1381 ,  G11B2007/0006

Abstract: An optical information reading apparatus includes a semiconductor laser, a beam splitter, a collimating lens, a super-resolution cut-off filter, an objective lens having a high numerical aperture, and a photodetector. The super-resolution cut-off filter is disposed immediately in front of the incident side of the objective lens. The photodetector is a well-known eight-division photodetector with a signal processing circuit, reads recorded information and also outputs tracking and focusing control signals to a control circuit. The laser beam is separated into a 0-th order laser beam and nullprimary laser beams, which are made incident on the objective lens, pass therethrough, and are made incident on the recording surface of a disk. The 0-th order laser beam is used to read information and to control focussing while the nullprimary laser beams are used to control tracking.

Abstract translation: 光学信息读取装置包括半导体激光器，分束器，准直透镜，超分辨率截止滤光器，具有高数值孔径的物镜和光电检测器。 超分辨率截止滤光器立即设置在物镜的入射侧的前方。 光电检测器是具有信号处理电路的众所周知的八分光电检测器，读取记录的信息，并且还将跟踪和聚焦控制信号输出到控制电路。 将激光束分离为0级激光束，入射到物镜上的±主激光束通过，并入射到盘的记录面上。 当使用±主激光束来控制跟踪时，第0阶激光束用于读取信息并控制聚焦。