公开(公告)号：JP2009170018A

公开(公告)日：2009-07-30

申请号：JP2008006014

申请日：2008-01-15

Applicant: Sony Corp ,  ソニー株式会社

Inventor： AIBA MOTOO ,  TOYODA KIYOSHI ,  YASUZUMI KOHEI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an objective lens converging a light beam without causing aberration or the like by providing phase structure for achieving appropriate interchange for a plurality of kinds of optical disks. SOLUTION: The objective lens converging light beams of at least first and second wavelength on a corresponding optical disk, has phase structure 11 of an annular shape which is formed in such a manner that a plurality of concave parts of an annular shape having the prescribed width in the radial direction and the prescribed height in the optical axis direction are provided, and which suppresses aberration. This phase structure 11 has the plurality of concave parts which are to be formed in an aspherical shape S B being reference and each of which has width and height obtained by the following procedures: determining the reference aspherical shape S B which does not cause aberration in the light beam of the first wavelength; calculating aberration quantity required to be corrected for suppressing aberration caused in the second wavelength light beam, determining a radial position and width of each concave part; and determining the height of each concave part from positions O, A, B, C in width of the concave part and the prescribed relational expression. COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：通过提供用于实现多种光盘的适当交换的相位结构来提供会聚光束而不产生像差等的物镜。 解决方案：将至少第一和第二波长的光束会聚在相应的光盘上，具有环形形状的相位结构11，其形成为具有环形的多个凹部，其具有 设置规定的径向宽度和光轴方向的规定高度，抑制像差。 该相结构11具有要被形成为非球面形状的多个凹部，其各自具有通过以下过程获得的宽度和高度：确定参考非球面形状S 不产生第一波长的光束的像差的SB SB 计算用于抑制在第二波长光束中产生的像差而校正的像差量，确定每个凹部的径向位置和宽度; 并且从凹部的宽度的位置O，A，B，C和规定的关系式确定各凹部的高度。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2006012220A

公开(公告)日：2006-01-12

申请号：JP2004184134

申请日：2004-06-22

Applicant: Sony Corp ,  ソニー株式会社

Inventor： SAITO MASAHIRO ,  FUKAZAWA YOSHIO ,  TOYODA KIYOSHI ,  SUZUKI JUNICHI

IPC: G11B7/135 ,  G11B7/00 ,  G11B7/09 ,  G11B7/125

CPC classification number: G11B7/0903 ,  G11B7/1353 ,  G11B2007/0006

Abstract: PROBLEM TO BE SOLVED: To accurately perform tracking error detection by designing large a diffracted light intensity ratio of a 0th-light and 1st-light of a wavelength by which 3 beam division is performed and improving the use efficiency of a laser. SOLUTION: This apparatus is provided with a light emitting part emitting a plurality of laser beams having different wavelengths, a diffraction grating 4 of a surface relief type having two steps of phase heights by providing a first phase grating 11a and second phase gratings 11b provided to both sides of the first phase grating 11a, dividing a laser beam of one wavelength emitted from the light emitting part 3 into three beams, and transmitting most of laser beams of other wavelengths emitted from the light emitting part 3, an objective lens 7 converging the laser beam emitted from the light emitting part 3 on an optical disk 8, an optical element 9 diffracting an optical path of return light reflected by the optical disk 8, and a light receiving part 10 receiving the return light diffracted by the optical element 9. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：通过设计通过进行3光束分割的波长的第0光和第1光的大的衍射光强度比，提高激光的使用效率，来准确地进行跟踪误差检测。 解决方案：该装置设置有发射具有不同波长的多个激光束的发光部分，通过提供第一相位光栅11a和第二相位光栅11a，具有两相相位高度的表面浮雕型衍射光栅4 11b设置在第一相位光栅11a的两侧，将从发光部分3发射的一个波长的激光束分成三个光束，并且传输从发光部分3发射的其它波长的大部分激光束，物镜 7将从发光部分3发射的激光束会聚在光盘8上，衍射由光盘8反射的返回光的光路的光学元件9和接收由光学衍射的返回光的光接收部分10 （C）2006年，JPO＆NCIPI

公开(公告)号：JP2005353174A

公开(公告)日：2005-12-22

申请号：JP2004173038

申请日：2004-06-10

Applicant: Sony Corp ,  ソニー株式会社

Inventor： SAITO MASAHIRO ,  FUKAZAWA YOSHIO ,  TOYODA KIYOSHI ,  SUZUKI JUNICHI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To perform comatic aberration correction and astigmatic difference adjustment with a small number of planes, to reduce the number of components and manufacturing processes, and to make an optical system small. SOLUTION: An optical pickup is provided with: a light source 22 for emitting light of a prescribed wavelength; an objective lens 23 for converging an outgoing light emitted from the light source 22 on an optical disk 2 and converging a returned light from the optical disk 2; an optical path dividing means 24 for dividing the optical path of the returned light reflected at the optical disk 2; a photodetector 25 for receiving the returned light divided by the optical path dividing means 24; and an asymmetrical curved surface part 31b in the optical path of the returned light between the optical path dividing means 24 and the photodetector 25. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：为了减少部件数量和制造过程，并且使光学系统变小，为了进行少量平面的彗形像差校正和散光差调整。 解决方案：光学拾取器设置有：用于发射规定波长的光的光源22; 用于将从光源22发射的出射光会聚在光盘2上并会聚来自光盘2的返回光的物镜23; 用于分割在光盘2上反射的返回光的光路的光路分割装置24; 用于接收由光路分割装置24分割的返回光的光电检测器25; 以及在光路分割装置24和光电检测器25之间的返回光的光路中的不对称曲面部分31b。（C）2006，JPO＆NCIPI

公开(公告)号：JP2005025934A

公开(公告)日：2005-01-27

申请号：JP2004274235

申请日：2004-09-21

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HINENO SATORU ,  SATO KATSUTOSHI ,  MATSUMOTO YOSHIYUKI ,  KATO NORIMUNE ,  YAMAZAKI MASAISA ,  MOGI HIROMI ,  SAITO KIMIHIRO ,  TOYODA KIYOSHI ,  NISHI NORIAKI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To realize accurate tracking control by correcting the astigmatism and suppressing jitters in the detected signals and to suppress deterioration of the read characteristics of the signals recorded on a magneto-optical disk. SOLUTION: An optical pickup is provided with a light source 11 which emits light beams, an objective lens 15 which focuses the light beams on the signal recording surface of a magneto-optical disk MO having a transparent resin substrate, a polarizing beam splitter 13 which separates the light beams emitted from the light source 11 and the return light beams from the recording surface of the magneto-optical disk through the objective lens 15, and a photodetector 19 which receives the return light beams from the signal recording surface separated by the beam splitter 13. Moreover, the optical pickup is provided with optical elements 14 and 22 which are arranged in the optical path from the light source to the magneto-optical disk and cancels the astigmatism given to the light beams by the double refractivity of the transparent resin substrate of the disk and an optical element supporting mechanism 23 which positions the mounting directions of the optical elements within a plane that orthogonally crosses the optical axis of the element and/or positions and supports the element by tilting it with respect to the optical axis of the light beam. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：通过校正像散和抑制检测信号中的抖动来实现精确的跟踪控制，并且抑制记录在磁光盘上的信号的读取特性的劣化。 解决方案：光拾取器设置有发出光束的光源11，将光束聚焦在具有透明树脂基板的磁光盘MO的信号记录表面上的物镜15，偏振光束 分离器13，其通过物镜15分离从光源11发射的光束和来自磁光盘的记录表面的返回光束;以及光电检测器19，其接收来自信号记录表面的返回光束分离 此外，光学拾取器设置有光学元件14和22，光学元件14和22被布置在从光源到磁光盘的光路中，并且通过双折射率消除给予光束的像散 盘的透明树脂基板和光学元件支撑机构23，其将光学元件的安装方向定位在平面内 正交地穿过元件的光轴和/或通过相对于光束的光轴倾斜来定位和支撑元件。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2003248941A

公开(公告)日：2003-09-05

申请号：JP2002044802

申请日：2002-02-21

Applicant: SONY CORP

Inventor： TOYODA KIYOSHI ,  FUKAZAWA YOSHIO

IPC: G11B7/09 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an optical head and a record reproduction device which are advantageous to relieve a requirement to accuracy for a part and the accuracy in mounting and realize lower-costs. SOLUTION: A division means 28 comprises a prism of quadrilateral shape with one cone point and four planes. An optical axis L of a reflected light beam to be incident on the division means 28 is configured to pass through the peak of the prism and be identical with straight lines with the same angle to each of the four planes. The reflected light beam is separated into four reflected light beams by being refracted at the four planes and led to an optical detection means 5. Since the optical axis of the reflected light beams and each of the four planes are in the same angle, the four reflected light beams refracted and divided at each of the planes are separated into positions at an equal distance focusing on the optical axis. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003223736A

公开(公告)日：2003-08-08

申请号：JP2002223989

申请日：2002-07-31

Applicant: SONY CORP

Inventor： FUKAZAWA YOSHIO ,  SUZUKI JUNICHI ,  TOYODA KIYOSHI ,  TANAKA TORU ,  KUBO TAKESHI ,  SAITO MASAHIRO ,  ISHII SATOSHI

IPC: G03H1/22 ,  G11B7/00 ,  G11B7/09 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To improve productivity, reduce production cost, and improve reliabil ity of a focusing error signal. SOLUTION: An optical pickup device is provided with a 1st diffraction grating 45 for dividing an output light beam emitted from the light reception/ emission integral type element 31 into a zero order light beam and ± 1st order light beams, a 2nd diffraction grating 46 for diffracting the optical path of a returned light beam from an optical disk 2, and a 3rd diffraction grating 47 for diffracting a + 1st order light beam diffracted by the 2nd diffraction grating 46 by being disposed at the location where the 1st order light beam is entered to correct variations in an optical path, wherein the light reception/ emission integral type element 31 is disposed at the location where the - 1st order light beam diffracted by the 3rd diffraction grating 47 is entered and receives the - 1st order light beam to generate a focusing error signal FE and also receives the returned light beams from the optical disk 2 of ± 1st order light beams divided by the 1st diffraction grating 45 to generate a tracking error signal. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003217166A

公开(公告)日：2003-07-31

申请号：JP2002015662

申请日：2002-01-24

Applicant: SONY CORP

Inventor： TOYODA KIYOSHI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an optical head and a recording/reproducing device, which are advantageous when reproduction using a plurality of optical beams and recording using optical beams different in number from during reproduction are realized by a simple constitution. SOLUTION: The optical head 104 is provided with a first laser light source 1, a second laser light source 2, a grating element 3, a grating means 4, a prism 5, a beam splitter 6, a collimator lens 7, an opening limitation means 8, an objective lens 9, a cylindrical lens 10, a photodetection means 11, and a laser power monitor photodetector 12. The second laser light source 3 is constituted to emit a laser beam of a wavelength for CD and CD-R reproduction toward the grating means 4. The grating means 4 is switched for its diffraction state by a servo control circuit 109 to emit optical beams different in number between reproduction and recording. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003059083A

公开(公告)日：2003-02-28

申请号：JP2001245865

申请日：2001-08-14

Applicant: Sony Corp ,  ソニー株式会社

Inventor： TOYODA KIYOSHI

IPC: G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  H01S5/062

Abstract: PROBLEM TO BE SOLVED: To suppress the variance or change in a peak power level of laser ejection beams caused by the variance of laser performance or the change due to the temperature. SOLUTION: A photodetecting part 17 for power monitor is divided into a photodetector 17b for peak power monitor having a small photodetecting area of the center part and photodetectors 17a for average power monitor having a large photodetecting area of the circumference or both sides. A laser driving circuit 1 is controlled so that a level of DC component in a photodetecting output current Ia of the photodetector 17a coincides with a target value, to control a level of a DC current Id for driving the laser. Further, a high frequency superimposing circuit 3 is controlled so that the amplitude of high frequency component of the photodetecting output current Ib (or an added current of the photodetecting output Ia of the photodetector 17a and the photodetecting output current Ib of the photodetector 17b) of the photodetector 17b coincides with the target value, then the amplitude of an high frequency current Ih superimposed to the DC current Id is controlled.

Abstract translation: 要解决的问题：抑制由激光性能的变化或由于温度的变化引起的激光喷射光束的峰值功率电平的变化或变化。 解决方案：用于功率监视器的光电检测部分17被分成具有中心部分的小的光检测区域的峰值功率监视器的光电检测器17b以及具有大的周边或两侧的光检测区域的平均功率监视器的光电检测器17a。 控制激光驱动电路1，使得光电检测器17a的光检测输出电流Ia中的DC分量与目标值一致，以控制用于驱动激光的DC电流Id的电平。 此外，控制高频叠加电路3，使得光检测输出电流Ib的高频分量（或光电检测器17a的光电检测输出Ia的加电流和光电检测器17b的受光输出电流Ib）的振幅为 光检测器17b与目标值一致，则控制与DC电流Id叠加的高频电流Ih的振幅。

公开(公告)号：JPH09212938A

公开(公告)日：1997-08-15

申请号：JP1595896

申请日：1996-01-31

Applicant: SONY CORP

Inventor： TOYODA KIYOSHI ,  SHIROICHI YOSHIRO ,  ABIKO TORU

IPC: G11B11/10 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To obtain an apparatus in which an error due to the jitters is not generated in a reproducing operation and which can record a good information signal by a method wherein a semiconductor laser and a light-emitting-output control circuit are provided and the servo band of the light-emitting-output control circuit is specified. SOLUTION: A reference voltage VR is supplied, via a resistance R1 having a prescribed resistance value, to the inverting input terminal (-) of a comparator IC1. The inverting input terminal (-) of the comparator IC1 is connected, via a capacitor C1, to the output terminal of the comparator IC1, and it is connected, via a resistance R4, to the output terminal of the comparator IC1. A prescribed voltage is supplied to the noninverting terminal (+) of the comparator IC1 via a photodiode PD for a front APC, and the noninverting terminal is grounded via a resistance R3. The output terminal of the comparator IC1 is connected, via a resistance R5 having a prescribed resistance value, to the base terminal of a PNP transistor TR1.

公开(公告)号：JPH0935323A

公开(公告)日：1997-02-07

申请号：JP20040995

申请日：1995-07-13

Applicant: SONY CORP

Inventor： TOYODA KIYOSHI

IPC: G11B7/09 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an optical pickup capable of being manufactured at low cost with simple constitution and being used both for recording and reproducing and for reproducing only. SOLUTION: This optical pickup consists of a light emitting means 11, an objective lens 15 of finite magnification for irradiating an optical disk D with light from the light emitting means, an actuator for supporting movably this objective lens in the biaxial directions, a light splitting means 13 for splitting return light from the optical disk and a photodetector 18 for detecting light splitted by the light splitting means. Then, the optical pickup is equipped with a convex lens 14 capable of keeping a distance between the light emitting means and the objective lens unchanged and arranged between the light emitting means and the objective lens.