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公开(公告)号：JP2590902B2
公开(公告)日：1997-03-19
申请号：JP19078887
申请日：1987-07-30
Applicant: SONY CORP
Inventor： MATSUMOTO YOSHUKI , KUME HIDEHIRO , MIMORI KOJI , YOSHITOSHI HIROSHI , YAMAMOTO ETSUSHI , OOIKAMI HIROSHI
Abstract: An optical pickup device having a semiconductor laser element (5) mounted on a substrate (2), a photo detector (3) formed on the substrate to receive a laser beam emitted from the semi-conductor laser element (2) and an optical element (6) mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam. The optical element (6) is adapted to reduce the amount of unwanted stray light from the laser (5) reaching the photo detector (3). The rear face (6f) of the element (6) is coated with light absorption material (14) to substantially prevent said incident light from being reflected into the photo detector (3). The light absorption material (14) is chosen to absorb light of the wavelength(s) emitted by the laser element. The material (14) preferably has the same refractive index as the element (6).
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公开(公告)号：JPH0869628A
公开(公告)日：1996-03-12
申请号：JP17135395
申请日：1995-06-14
Applicant: SONY CORP
Inventor： YAMAMOTO ETSUSHI
Abstract: PURPOSE: To obtain an optical pickup adjustment method of an optical pickup constituted in such a manner that the mounting positions of light emitting and light receiving elements are easily adjusted. CONSTITUTION: This optical adjustment method of an optical pickup includes a light emitting and light receiving device 10 having a light emitting part 13 and light receiving part 12 on a substrate and an objective lens which converges the light beam from this light emitting part to a recording surface of an optical disk and introduces the return light reflected by the recording surface to the light receiving part side. The light receiving part 12 is divided into a first light receiving element group 12a and second light receiving element group 12b lining up in the track direction of an optical disk. The first light receiving element group 12a and second light receiving element group 12b are composed of plural light receiving elements lining up respectively in the radial direction of the optical disk. The method described above includes an adjustment stage to adjust the position of the light emitting and light receiving device in accordance with the signals obtd. by a stage of making calculation in accordance with the output signals of the first light receiving element group 12a and the output signals of the light receiving elements of the second light receiving element group 12b.
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公开(公告)号：JPH02121130A
公开(公告)日：1990-05-09
申请号：JP27404088
申请日：1988-10-29
Applicant: SONY CORP
Inventor： KUME HIDEHIRO , YAMAMOTO ETSUSHI , NAGASHIMA KENJI
Abstract: PURPOSE:To correct the asymmetry between a beam spot formed in the focus deviation direction and a recording track and to improve the correlation between the focus deviation value and the displacements of various characteristics of an optical pickup device by setting a semiconductor laser element so as to tilt the meridional surface of the light beam projected on an optical disk in the tangent direction of the recording track of the optical disk by a prescribed angle. CONSTITUTION:The light beam radiated from a light transmission/reception composite element 3 is made incident on an objective lens and then projected on a signal recording surface of an optical disk 101. In the case, the element 3 is set so that the meridional surface of the light beam is set by a prescribed angle, i.e., about 45 deg. to the tangent direction of a recording track of the disk 101. Thus it is possible to correct the asymmetricalness defined on the basis of the tangent of a beam spot produced on the disk 101 according to the focus deviation direction. As a result, the characteristic of an optical pickup device are improved to the focus deviation.
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公开(公告)号：JP2005216447A
公开(公告)日：2005-08-11
申请号：JP2004024796
申请日：2004-01-30
Inventor： NAGARA TORU , YAMAMOTO ETSUSHI , OSHIMA YOICHI , YAMANE YASUHIRO , TAKANO HIDEKI
Abstract: PROBLEM TO BE SOLVED: To attain reduction of the number of pins, reduction of an operating current, and the miniaturization by arranging so that gain setting of a plurality of amplifier circuits and operational amplifier circuits to be used for the photodetection are allowed with instruction inputs of the small number of bits.
SOLUTION: By a 1st selection control signal from a selection circuit 25, the amplifier circuit and operational amplifier circuit required for the recording or reproducing operation are selected from the amplifier circuits 23A-23H and operational amplifier circuits 24A-24D of photodetecting elements 22A-22H, and these circuits are controlled to the operating state, and also the amplifier circuits and operational amplifier circuits other than the selected amplifier circuit and operational amplifier circuit are controlled to the inoperative state. Then, by a 2nd selection control signal from the selection circuit 25, the gains of each amplifier circuit and operational amplifier circuit are separately set and controlled so that output levels of selected each amplifier circuit and operational amplifier circuit become values adapted for the recording or reproducing of an optical signal.
COPYRIGHT: (C)2005,JPO&NCIPIAbstract translation: 要解决的问题为了减少引脚数量，降低工作电流，并且通过布置使得允许用于光电检测的多个放大器电路和运算放大器电路的增益设置被允许 具有少量位的指令输入。 解决方案：通过来自选择电路25的第一选择控制信号，从放大器电路23A-23H和受光元件的运算放大器电路24A-24D中选择记录或再现操作所需的放大器电路和运算放大器电路 22A-22H，这些电路被控制到工作状态，并且除选择的放大器电路和运算放大器电路之外的放大器电路和运算放大器电路也被控制到非工作状态。 然后，通过来自选择电路25的第二选择控制信号，分别设置和控制每个放大器电路和运算放大器电路的增益，使得所选择的每个放大器电路和运算放大器电路的输出电平变为适于记录或再现的值 的光信号。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JPH087321A
公开(公告)日：1996-01-12
申请号：JP16317194
申请日：1994-06-21
Applicant: SONY CORP
Inventor： YAMAMOTO ETSUSHI
IPC: G11B11/10 , G11B7/125 , G11B7/13 , G11B11/105
Abstract: PURPOSE:To radiate heat to the outside of a package, by providing a light detecting/light emitting element with a light emitting element, the package containing the element and a radiation fin set at the package. CONSTITUTION:A light detecting/light emitting element 1 is used to reproduce data recorded to an optical disc D by a laser light L or record data to the optical disc D. An objective lens 3 is disposed between the optical disc D and the light detecting/light emitting element 1. The objective lens 3 is movable along a tracking direction TRK and a focus direction FCS (a direction approaching the optical disc D and a direction away from the optical disc D) by a biaxial actuator (not shown) at an optical pickup 2. A ceramic package 10 has a plurality of radiation fins 12 to radiate heat outside the package 10.
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Patent Agency Ranking
公开(公告)号：JPH05314742A
公开(公告)日：1993-11-26
申请号：JP13156292
申请日：1992-04-24
Applicant: SONY CORP
Inventor： MIMORI KOJI , YAMAMOTO ETSUSHI
Abstract: PURPOSE:To accurately display an eye pattern of an RF signal regenerated without working a tracking servo. CONSTITUTION:The eye pattern of the nontracking RF signal regenerated from an optical disk (not shown in the figure) without tracking by an optical disk (not shown in the figure) at a level of an envelope of the nontracking RF signal in sections TA, TB and TC as smaller than a cut level VOK is only selectively displayed.
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公开(公告)号：JPS6446243A
公开(公告)日：1989-02-20
申请号：JP20229587
申请日：1987-08-13
Applicant: SONY CORP
Inventor： YOSHITOSHI HIROSHI , KUME HIDEHIRO , MATSUMOTO YOSHIYUKI , MIMORI KOJI , YAMAMOTO ETSUSHI , OIKAMI HIROSHI
IPC: G11B7/135
Abstract: PURPOSE:To obtain an information reading output and a correct detecting output to detect a focus error, etc., by properly separating reflected laser light beams from a recording medium and the laser light beams toward the recording medium, and making them reach first and second photo detecting parts. CONSTITUTION:First and second photo detecting parts 35 and 36 are formed on a semiconductor substrate 34, and a semiconductor laser element 37 and a reflecting surface part 40 are provided on the semiconductor substrate 34. A beam splitter part 41, etc., which guide laser light beams L2 reflected from a laser element 37 by the reflecting surface part 40 to a recording medium part 44 side and guide laser light beams L2' from the recording medium 44 side through a light path different from that of the laser light beams L2 to the side of the first and second photo detecting parts 35 and 36, are provided. Thus, the reflected laser light beams from the recording medium 44 can be properly guided to the respective first and second photo detecting part 35 and 36, and the proper information reading output, etc., can be obtained from the photo detecting parts 35 and 36.
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公开(公告)号：JPS6433735A
公开(公告)日：1989-02-03
申请号：JP19078787
申请日：1987-07-30
Applicant: SONY CORP
Inventor： KUME HIDEHIRO , MIMORI KOJI , YOSHITOSHI HIROSHI , MATSUMOTO YOSHIYUKI , YAMAMOTO ETSUSHI , OIKAMI HIROSHI
Abstract: PURPOSE:To detect an RF reproducing signal and a tracking error signal with a three-beams system without using a phase diffraction grating by obtaining the semitransmittable reflecting surface of an optical element for a light branching as at least three semitransmittable reflecting surface parts arranged with a prescribed angle. CONSTITUTION:On a semiconductor substrate 2, a first light detecting element 3 to detect the RF reproducing signal and a third light detecting element 8 for detecting the tracking error signal are provided. A prism 6, which arranges the light on the light receiving surface of these light detecting elements, has three semitransmittable reflecting surface parts 10a-10c and since a beam from a laser semiconductor chip 5 is projected to the three semitransmittable reflecting surface parts 10a-10c of the prism 6, the beam is divided into three beams and made incident on a disk. The three reflected beams, which are reflected again by the disk, transmits through the three semitransmittable reflecting surface parts 10a-10c and go into the prism 6 and a focal point is obtained on the first and third photodetecting elements 3 and 8.
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公开(公告)号：JP2006179186A
公开(公告)日：2006-07-06
申请号：JP2006086766
申请日：2006-03-27
Inventor： YAMAMOTO ETSUSHI , KOBAYASHI YOSHIHIRO
IPC: G11B7/09
Abstract: PROBLEM TO BE SOLVED: To provide a circuit which eliminates offsets included in the tracking signal error, which are computed by a push-pull system.
SOLUTION: A tracking error signal computing circuit 20 has peak detection/multiplying circuits 22 and 26 which detect peaks of detection signals E and F of the left and the right regions of photodiodes to detect deviation of a beam light from the track of a disk recording medium and multiply a coefficient K, subtracting circuits 24 and 28 which subtract the multiplication results from the respective detection signals E and F to eliminate the offsets, and a subtracting circuit 30 which computes the difference of the signals from which offsets are eliminated (by conducting push-pull computations) so as to output a tracking error signal TPP(TE). The value of the coefficient K can be varied by adding an alignment signal AL to the detection signals E and F. In order to provide frequency dependency onto the coefficient K, the alignment signal AL is added to the signals E or F through a filter.
COPYRIGHT: (C)2006,JPO&NCIPIAbstract translation: 要解决的问题：提供消除由推挽系统计算的跟踪信号误差中包括的偏移的电路。 解决方案：跟踪误差信号计算电路20具有峰值检测/乘法电路22和26，其检测光电二极管的左右区域的检测信号E和F的峰值，以检测来自轨道的光束的偏离 磁盘记录介质，并乘以系数K，减法电路24和28，它们从相应的检测信号E和F中减去相乘结果以消除偏移;减法电路30，计算消除偏移的信号的差异 （通过进行推挽式计算），以输出跟踪误差信号TPP（TE）。 可以通过向检测信号E和F添加对准信号AL来改变系数K的值。为了向系数K提供频率依赖性，通过滤波器将对准信号AL加到信号E或F. 版权所有（C）2006，JPO＆NCIPI
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公开(公告)号：JPH1125479A
公开(公告)日：1999-01-29
申请号：JP17605997
申请日：1997-07-01
Applicant: SONY CORP
Inventor： YAMAMOTO ETSUSHI
Abstract: PROBLEM TO BE SOLVED: To provide a small and inexpensive light emitting/receiving element with a low noise and a small and inexpensive optical pickup device with a low noise capable of generating a light beam with which an optical disk is irradiated and obtaining a focusing error signal from the returned light beam. SOLUTION: The light receiving element part 101 of a light emitting/receiving element is provided with a light receiving part 41 and a light receiving part 42, both having tripartite light receiving surfaces, the light receiving surface A and the light receiving surface C are connected to the light receiving surface B' and a signal PD1 is outputted through a current-voltage converting amplifier 45. Similarly, the light receiving surface A' and the light receiving surface C' are connected to the light receiving surface B and a signal PD2 is outputted through a current-voltage converting amplifier 46. The difference signal (PD1-PD2) between the signal PD1 and the signal PD2 is made to be a focusing error signal FCS. By providing the light emitting/receiving element and a light receiving element for obtaining a RF signal and a tracking error signal TRK from the returned light beam from the optical disk, the optical pickup is constituted.
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