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公开(公告)号：JPS6380224A
公开(公告)日：1988-04-11
申请号：JP22530286
申请日：1986-09-24
Applicant: SONY CORP
Inventor： UMETSU NOBUHIKO , YAMAMOTO MASANOBU
Abstract: PURPOSE:To prevent an unnecessary spectral signal from being generated in a recording frequency band, and to satisfactorily record a signal in a recording medium, by specifying an inter-longitudinal mode beat frequency of a laser and a carrier frequency of an acousto-optical modulation element. CONSTITUTION:When a gas laser device 1 for oscillating a multi-mode laser is used as a laser source, and also, a data is recorded to a recording medium 4 by using an acousto-optical modulation element 2 for modulating a laser, when an inter-longitudinal mode beat frequency of the laser, a carrier frequency of the acousto-optical modulation element 2, and a recording frequency band are set to fLHz, fCHz, and 0-fHz, respectively, an inter-longitudinal mode beat frequency fL and a carrier frequency fC are selected so as to satisfy an expression of ¦m.fL-n.fC¦>=f (in this regard, m and n are integers). In such a way, an unnecessary spectral signal comes to be generated in only the outside of the recording frequency band, and satisfactory recording can be executed easily.
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公开(公告)号：JPS634439A
公开(公告)日：1988-01-09
申请号：JP14673186
申请日：1986-06-23
Applicant: SONY CORP
Inventor： WATANABE HIDETOSHI , KUMAI SATOSHI , SUZUKI KOJI , YAMAMOTO MASANOBU
Abstract: PURPOSE:To copy high quality information recording media with high productivity by providing a large diameter part and a small diameter part to a shaft member entering a substrate opposite to a stamper, and providing a projecting part to part of the large diameter part. CONSTITUTION:In order to center the substrate 34 with respect to the stamper 33, the shaft member 22 inserted through the stamper 33 and the substrate 34, is provided and the shaft member 22 has the large diameter part 26 having a relatively larger diameter and the small diameter part 25 connected to the large diameter part 26 and having a relatively smaller diameter. Further, a projection 27 projected in a direction orthogonal to the shaft center of the shaft member 22 is formed in the vicinity of the boundary between the large diameter part 26 and the small diameter part 25, the small diameter part 25 is inserted through the stamper 23 and the large diameter part 26 are penetrated through the substrate 24 to apply alignment. While an end face 26a at the boundary of the large diameter part 26 with the small diameter 25 is contacted closed to the stamper 33, the end face 26a is opposed to the base and the projection 26 pushes the substrate 34 bonded because of the cured resin 12 to exfoliate the base 34 from the stamper 33.
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公开(公告)号：JPS62285233A
公开(公告)日：1987-12-11
申请号：JP12858586
申请日：1986-06-03
Applicant: SONY CORP
Inventor： UMETSU NOBUHIKO , YAMAMOTO MASANOBU
Abstract: PURPOSE:To accurately record information onto two recording tracks while a beam spot interval is kept to a setting value by calculating the beam spot interval error from an pickup output and acting a feedback control loop controlling the deflection of one light beam in response to the error output. CONSTITUTION:An image pickup section 30 receiving the reflected return light from a recording master disk 20 picks up beam spots Sa, Sb of two light beams La, Lb for information recording radiated onto the disk 20. An operation processing section 33 calculates the interval error of the beam spots Sa, Sb on the recording master disk 20 from the image pickup output and a carrier frequency from a voltage controlled variable oscillator of an AOD drive section 34 is controlled in response to the error output to drive an AOD8. Thus, the feedback control loop controlling the deflection of the 2nd light beam Lb acts so as to keep the beam spot interval to a prescribed value and the information is recorded on the two recording tracks on the recording master disk 20 while the beam spot interval is kept to the setting value.
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公开(公告)号：JPS61236046A
公开(公告)日：1986-10-21
申请号：JP7578485
申请日：1985-04-10
Applicant: SONY CORP
Inventor： YAMAMOTO MASANOBU
Abstract: PURPOSE:To obtain a disclike recording medium using relatively simple constitution by making a guide groove formed on the disclike recording medium read frequency of a specified signal and making it to belong to frequency band higher than servo control frequency band formed at the time of scanning by a light beam. CONSTITUTION:The depth (t) and the width (w) of a spiral guide groove 13 formed on the surface of a base body 14' are made to fixed values and opposite edge part moves parallel back and forth in the direction of width of the groove at minute amplitude and forms repetition of concavities and convexities. The period of repetition is made to correspond to the period of a specified clock signal and made to belong to frequency band higher than servo control frequency band in tracking servo control system formed at the time when the guide groove is scanned by a reading beam at the time of recording or reproducing. Accordingly, a clock signal of frequency belonging to frequency band higher than servo control frequency band in a tracking servo control system is written in the guide groove 13 in form of repetition of concavities and convexities at maximum amplitude Q' of opposite edge part. Thus, the disclike recording medium having a spiral guide groove in which a specified signal is written can be obtained.
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公开(公告)号：JPS6050733A
公开(公告)日：1985-03-20
申请号：JP15945783
申请日：1983-08-31
Applicant: SONY CORP
Inventor： YAMAMOTO MASANOBU
Abstract: PURPOSE:To attain reproduction of an information signal having a satisfactory S/N by forming a pre-group having the specific phase depth at the side of a beam incident plane of a metallic layer which can be recorded and reproduced optically and an address pit having the specific phase depth to a photoresist layer. CONSTITUTION:A photoresist layer 6 is coated on a glass substrate 5 with lambda/4n thickness. For an address pit AP', two beams are used to cut the layer 6 up to the surface of the substrate 5 with exposure and development. While a pre-group PG' is formed down to lambda/8n phase depth by means of a beam having smaller light quantity than the beam used for the AP'. A pre-group PG is formed on a land part LD of a metallic layer 3 with 2mum pich. The space between the group PG and an address pit AP is set at 1mum with 0.5mum width respectively. The information signal is recorded at the center of the part LD.
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Patent Agency Ranking
公开(公告)号：JPS59207433A
公开(公告)日：1984-11-24
申请号：JP8164883
申请日：1983-05-12
Applicant: Sony Corp
Inventor： YAMAMOTO MASANOBU , OGAWA HIROSHI
CPC classification number: G11B7/24085 , G11B7/14 , G11B11/105
Abstract: PURPOSE:To attain the recording with high density by recording bit trains of >=2 series in parallel to each other and in a synchronous state within a globe set on a magnetic disk and detecting a diffraction pattern of the return light which tracking the bit trains with light spots. CONSTITUTION:Pits H1 and H2 of two series forming a paired tracks are recorded to a light spot S. The light delivered from a laser light source 10 forms the spot S on the pits H1 and H2 through a polarized beam splitter PBS11, a collimator lens 12, a lambda/4 plate 1 and an objective lens 14. The return light of the spot S travels back and is reflected by the PB11 to be made incident to a 2-split photodetector 15. Then the information recorded on the paired tracks is reproduced through detection levels A' and B'. Thus the recording is possible with high density.
Abstract translation: 目的：通过记录> = 2系列的位列并行并在磁盘中设置的球体中处于同步状态并检测跟踪位列的返回光的衍射图案，以高密度记录 有光点。 构成：形成配对轨道的两个系列的凹坑H1和H2被记录到光点S.从激光源10传送的光通过偏振分束器PBS11，准直透镜在凹坑H1和H2上形成点S 12，λ/ 4板1和物镜14.斑点S的返回光返回并被PB11反射，以入射到二分割光电检测器15.然后记录在成对轨道上的信息是 通过检测水平A'和B'再现。 因此，可以高密度地进行记录。
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公开(公告)号：JPS58220254A
公开(公告)日：1983-12-21
申请号：JP10269782
申请日：1982-06-15
Applicant: Sony Corp
Inventor： YAMAMOTO MASANOBU
CPC classification number: G11B7/128
Abstract: PURPOSE:To ensure constitution of an optical system in a simple way and with a low cost, by modulating the light by means of an acoustic-optical modulator and a stepped digital multi-value signal of >=3 ternary value, and controlling the intensity of output light with high accuracy. CONSTITUTION:The laser light LO is supplied to an acoustic-optical modulator 11 from a laser light source 12. A digital multi-value signal SI is supplied to an amplitude modulator 14 through a terminal 13. At the same time, a high frequency signal is supplied to the modulator 14 as a carrier SC from a high frequency oscillator 15. The modulator 14 produces a signal SI' which is smoothed and modulated by an information signal SI. This signal SI' is supplied to the modulator 11 as a modulated signal via an amplitude modulator 16. The modulator 16 applies further modulation of amplitude to the signal SI' on the basis of a comparison error signal SCa obtained from a comparator 21. Therefore the primary diffracted light D1 delivered from the modulator 11 is set at a prescribed level with control of the light intensity.
Abstract translation: 目的：通过简单的方式和低成本确保光学系统的构成，通过声光调制器和具有> = 3三进制值的阶数数字多值信号调制光，并控制光强度 的高精度输出光。 构成：激光LO从激光源12提供给声光调制器11.数字多值信号SI通过端子13提供给幅度调制器14.同时，高频信号 作为载波SC从高频振荡器15提供给调制器14.调制器14产生由信息信号SI平滑调制的信号SI'。 该信号SI'通过幅度调制器16作为调制信号提供给调制器11.调制器16基于从比较器21获得的比较误差信号SCa对信号SI'进一步进行调制。因此， 从调制器11传送的主衍射光D1通过光强度的控制被设定在规定的水平。
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公开(公告)号：JPS5671856A
公开(公告)日：1981-06-15
申请号：JP14809479
申请日：1979-11-15
Applicant: SONY CORP
Inventor： FURUKAWA SHIYUNSUKE , OGAWA HIROSHI , OKADA HITOSHI , YAMAMOTO MASANOBU
Abstract: PURPOSE:To enable to reproduce the disc with a constant line speed, by frequency- dividing playback PCM signal with a given ratio, performing phase comparison for the frequency dividing signal with the signal in reference frequency, and controlling the revolution of disc with compared output. CONSTITUTION:The playback PCM signal from a head 10 is fed to a decoder through a wave shape rectifying circuit 20. On the other hand, the playback PCM signal through the circuit 20 is frequency-divided into 1/M at the frequency divider 30. For example, M=256 is made. Further, the frequency dividing signal is fed to one input of the phase comparator 40. Further, the output signal of a crystal oscillator 50 is frequency-divided at the frequency divider 60 to obtain the signal in reference frequency f0, and this is fed to another input of the phase comparator 40. Further, the output of the phase comparator 40 is given to a motor to control the revolution. Accordingly, the revolution of a disc can be controlled so that the frequency f of the frequency dividing signal from the frequency divider 30 is equal to the reference frequency f0.
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公开(公告)号：JPS547307A
公开(公告)日：1979-01-20
申请号：JP7299377
申请日：1977-06-20
Applicant: SONY CORP
Inventor： YAMAMOTO MASANOBU
Abstract: PURPOSE:To enable tracking controlling be performed by a wobbling method by driving a semiconductor laser with electrostrictive elements thereby controlling light beam.
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公开(公告)号：JPS51135503A
公开(公告)日：1976-11-24
申请号：JP5985875
申请日：1975-05-20
Applicant: SONY CORP
Inventor： YOSHIO SATORU , SHIRAISHI TADAO , YAMAMOTO MASANOBU
Abstract: PURPOSE:To provide easily precise patterns of high resolution by etching the metal layer as a mask, making use of the fact that the metal layer surface at the heated part of the base body is provided with an etching mask-proof.
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