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公开(公告)号：JPH07130024A
公开(公告)日：1995-05-19
申请号：JP29606193
申请日：1993-11-01
Applicant: SONY CORP
Inventor： TOYODA KIYOSHI , SAITO KIMIHIRO
IPC: G11B11/10 , G11B11/105
Abstract: PURPOSE:To position a magneto-optical detector precisely by integrally sticking a prism transmitting a light beam from a light source, a prism leading a return beam from a disk to a photodetector and a prism leading it to a monitoring photodetector. CONSTITUTION:This detector is provided with first prisms 31, 32, 33 reflecting the light beam LA1 from the light source LD in the direction of a magneto- optical disk 10, an azimuth rotator 34 rotating a poarizing surface of a return beam from the disk 10, second prisms 35, 36, 37, 43, 44 separating the return beam from the disk 10 made incident through the azimuth rotator 34 and leading it to photodetectors PD1, PD2 provided on the same substrate 40, a third prism 39 which is stuck on the side end surfaces of the first prisms 31-33 and a 2nd prism and leading the light beam LA1 from the light source LD to the monitoring photodetector PDM provided on the substrate 40 together with two photodetectors PD1, PD2.
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公开(公告)号：JPH06131684A
公开(公告)日：1994-05-13
申请号：JP27613992
申请日：1992-10-14
Applicant: SONY CORP
Inventor： SAITO KIMIHIRO , TOYODA KIYOSHI
IPC: G11B7/135 , G11B11/10 , G11B11/105
Abstract: PURPOSE:To miniaturize the optical head device, to facilitate production and to improve reliability. CONSTITUTION:The luminous flux emitted from a semiconductor laser 1 is disposed so as to be made incident on a polarizing light separating semipermeable film 101 at an angle inclined at 22.5 deg. therewith. This polarizing light separating semipermeable film 101 and a polarized light separating film 102 are formed to attain 54 deg. angle and the refractive index of a medium to transmit light is 1.7. The light emitted from the semiconductor laser 1 is reflected by the polarizing light separating semipermeable film 101 and is condensed onto a recording medium by an objective lens 2. The light reflected by the recording medium returns backward the forward path. The light is transmitted to the polarizing light separating semipermeable film 101 and is separated by the polarized light separating film 102 to P polarized light and S polarize light. The light is detected by a first photodetector 4 and a second photodetector 5, by which a servo signal and reproduced signal are obtd.
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公开(公告)号：JPH05307786A
公开(公告)日：1993-11-19
申请号：JP13989192
申请日：1992-05-02
Applicant: SONY CORP
Inventor： TAKASAKI KOJI , TOYODA KIYOSHI
IPC: G11B11/10 , G11B11/105 , G11B21/21
Abstract: PURPOSE:To suppress the generation of vignetting and the effect of a manufacturing error to the minimum in the gap sensor for a magneto-optical disk device and also to mask the device small in size and low in cost. CONSTITUTION:Bottom faces of each recessed part 7B, 7B of a pedestal 7 for arranging two photo transistors 3A, 3B are formed into the planar state. The bottom face of a recessed part 7C for arranging an LED 2 is formed inclining against this plane so that the angle of emissive light of the LED 2 and the incident angle of a light receiving means become large.
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公开(公告)号：JPH02122427A
公开(公告)日：1990-05-10
申请号：JP27587788
申请日：1988-10-31
Applicant: SONY CORP
Inventor： TOYODA KIYOSHI , KOBAYASHI SHOEI
Abstract: PURPOSE:To excellently and stably record information on an optical card by discriminating a period, when optical beams made incident on an optical card are focus- regulated, from the period when the optical beams made incident on the optical card are modulated according to information and a recording track where the information is recorded is formed on the optical card. CONSTITUTION:In a forward or a backward operation scanning period when the recording track, where the information is recorded, is formed on an optical card 10, the optical beams made incident on the optical card 10 are practically in a suitable focusing condition. That is, the period, when the optical beams made incident on the optical card 10 are focus-regulated, is discriminated from the period, when the optical beams made incident on an optical card 10' are modulated according to the information so as to form the recording track where the information is recorded on the optical card 10' and the forward or backward operation scanning is executed for the optical card 10'. Consequently, a focusing driving signal necessary for the focus-modulation of the optical beams does not trouble the scanning at the time of forming the recording track on the optical card 10' of the optical beams and the modulation according to the optical beam information. Thus, information recording on the optical card 10' is excellently and stably executed.
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公开(公告)号：JPS63266640A
公开(公告)日：1988-11-02
申请号：JP10076487
申请日：1987-04-23
Applicant: SONY CORP
Inventor： TOYODA KIYOSHI
Abstract: PURPOSE:To obtain a false focus error signal and a focus error signal not to generate the deviation of a just focus point by making an incident angle into the vicinity of the Brewster's angle or below for the light (p)-polarized from the protecting layer side of a light recording medium. CONSTITUTION:An incident angle thetai of an incident light to an information recording film 3 of a light recording medium 1 is selected to the vicinity of the Brewster's angle thetaB or below and the light made incident to a photodetecting means 7 is (p)-polarized. Thus, the incident angle thetai from a light emitting means 5 to the light recording medium 1 is selected and made incident to the vicinity of the Brewster's angle thetaB or below, and when the (p) polarizing wave is photodetected, the influence of a spare reflecting light from the surface of a protecting layer 2 can be minimized and a false error signal and a focus error signal without the dislocation of the just focus point can be detected.
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Patent Agency Ranking
公开(公告)号：JPS6066337A
公开(公告)日：1985-04-16
申请号：JP17392083
申请日：1983-09-20
Applicant: SONY CORP
Inventor： OOKI YUTAKA , TOYODA KIYOSHI
Abstract: PURPOSE:To remove defects such as a large optical system, high production cost, a heavy movable part, and high power consumption by feeding back a focus error signal to a wavelength control means of a variable wavelength light source. CONSTITUTION:Laser light from a semiconductor laser 17 provided with a power source 18 is supplied to a hologram 20 through a beam splitter (BS) 19 and a laser beam focused in accordance with the wavelength of the laser light is made incident on the recording surface 5 of a disc. The reflected light is reflected by the BS19 and made incident on a photodetector 25 in which two photodetectors are concentrically arranged through a conical lens 24. The difference of signals from the BS19 is catched by an operator 26 and inputted to a wavelength control circuit 28 as a focus error signal SF and a high frequency signal is supplied to the semiconductor laser 17, so that the wavelength of the laser light is changed and the laser light is correctly focused on the recording surface 5. Since the movable part is removed, a defect due to the movable part is removed.
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公开(公告)号：JPS5911549A
公开(公告)日：1984-01-21
申请号：JP11901182
申请日：1982-07-08
Applicant: Sony Corp
Inventor： TOYODA KIYOSHI , OOKI YUTAKA , SHIROICHI YOSHIROU
CPC classification number: G11B7/12
Abstract: PURPOSE:To reduce the back talk noise, by using a reproducing signal obtained from a main optical detector and a compensating signal obtained from a sub- optical detector for forming a compensated reproducing signal. CONSTITUTION:A laser beam from a semiconductor laser light source 11 is made incident to a collimator lens through a polarized optical beam splitter 3 for bringing it into a parallel beam, and the collected beam of the parallel beam is irradiated on an optical recording medium(disc)7. Further, the beam irradiated from the optical recording medium, i.e., the reproducing beam subject to modulation is made incident to an optical detector 9, and the reproducing signal obtained from the optical detector 9 is applied to a head amplifier 11. Further, the monitor optical detector 2 is used as the sub-optical detector and the compensation signal is obtained from the detector. Moreover, the reproducing signal from the head amplifier (an amplifier with less change in the amplification factor due to temperature is desirable) 11 and the compensation signal from the amplifier 14 are applied to a subtractor 15 for subtraction. That is, the correcting signal is subtracted from the reproducing signal at the subtractor 15. Thus, the reproducing signal reduced with the back talk noise is obtained from an output terminal 12.
Abstract translation: 目的：通过使用从主光学检测器获得的再现信号和从亚光检测器获得的用于形成补偿再现信号的补偿信号来减少反向通话噪声。 构成：将来自半导体激光光源11的激光束通过偏振光束分离器3入射到准直透镜，使其成为平行光束，并将平行光束的收集光束照射在光记录介质上 盘）7。 此外，从光记录介质照射的光束，即经受调制的再现光束入射到光检测器9，并将从光检测器9获得的再现信号应用于头放大器11.此外，监视器 光检测器2用作子光学检测器，并且从检测器获得补偿信号。 此外，来自前置放大器的再现信号（放大器因温度变化较小而变化较小的放大器）11和来自放大器14的补偿信号被施加到用于减法的减法器15。 也就是说，在减法器15中从再现信号中减去校正信号。因此，从输出端子12获得用反向通话噪声减小的再现信号。
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公开(公告)号：JP2005038598A
公开(公告)日：2005-02-10
申请号：JP2004274236
申请日：2004-09-21
Inventor： TOYODA KIYOSHI , NISHI NORIAKI , SAITO KIMIHIRO , HINENO SATORU , SATO KATSUTOSHI , MATSUMOTO YOSHIYUKI , KATO NORIMUNE , YAMAZAKI MASAISA , MOGI HIROMI
Abstract: PROBLEM TO BE SOLVED: To suppress deterioration of characteristics in reading a signal recorded on an optical disc by compensating astigmatism resulting from a pre-groove formed on the optical disc, suppressing jitter for a signal detected from the optical disc and realizing accurate tracking control. SOLUTION: The device is an optical pickup which is configured with a light source 11 for emitting a light beam, an objective lens for focusing the light beam on a recording surface for an optical disc MO having a transparent resin substrate, a polarized beam splitter 13 for splitting the light beam emitted from the light source 11 and the return light beam from the recording surface for the optical disc via the objective lens 15, a photo detector 19 for receiving the light returned from the recording surface and split by the beam splitter 13, and optical elements 14, 22 arranged on a light path leading to the optical magnetic disc from the light source for canceling the astigmatism caused to the light beam by the pre-groove formed on the optical magnetic disc. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract translation: 解决的问题为了抑制通过补偿由光盘上形成的预制槽产生的散光来读取记录在光盘上的信号的特性，抑制从光盘检测到的信号的抖动，并且实现准确 跟踪控制。 解决方案：该装置是配置有用于发射光束的光源11的光学拾取器，用于将光束聚焦在具有透明树脂基板的光盘MO的记录表面上的物镜，偏振 分光器13，用于通过物镜15分离从光源11发射的光束和来自用于光盘的记录表面的返回光束;光电检测器19，用于接收从记录表面返回的光并被分离 光束分离器13和光学元件14,22，布置在从光源通向光磁盘的光路上，以消除由形成在光磁盘上的预制槽导致的光束的散光。 版权所有（C）2005，JPO＆NCIPI
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19.发明专利
公开(公告)号：JP2003223738A
公开(公告)日：2003-08-08
申请号：JP2002226764
申请日：2002-08-02
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO , SUZUKI JUNICHI , TOYODA KIYOSHI , TANAKA TORU , ISHII SATOSHI , KUBO TAKESHI , SAITO MASAHIRO
IPC: G11B7/09 , G11B7/1353 , G11B7/1381 , 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
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20.发明专利
公开(公告)号：JP2003157550A
公开(公告)日：2003-05-30
申请号：JP2001358245
申请日：2001-11-22
Applicant: SONY CORP
Inventor： FUKAZAWA YOSHIO , SUZUKI JUNICHI , TOYODA KIYOSHI
Abstract: PROBLEM TO BE SOLVED: To improve productivity, to reduce production costs and to improve reliability in a focusing error signal and a tracking error signal. SOLUTION: In an optical disk device 1, a beam emitted from a light source 31 is split to three of main and side beams by a first diffraction grating 45 in an optical pickup 3, an optical disk 2 is irradiated with the beams by an objective lens 34, +1st-order light is used as return light by diffracting the optical path of respective return beams from the optical disk 2 by a second diffraction grating 46, and -1st-order light is used as return light by diffracting the respective return beams diffracted by the second diffraction grating 46 by a third diffraction grating 46. Therefore, the fluctuation of the optical path in the second diffraction grating 46 is corrected by the wavelength fluctuation of light emitted from the light source 31 and the return beams diffracted by the third diffraction grating 47 are each split to a plurality of beams by a splitting prism 48. Besides, the main beams split by the splitting prism 48 are each received by a light receiving part 35. Therefore, a focusing error FE is acquired and the side beams transmitted through the splitting prism 48 are received so that the tracking error signal can be acquired.
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