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71. 发明专利

JPH0244545A PRODUCTION OF MASTER DISK FOR OPTICAL DISK 失效
公开(公告)号：JPH0244545A
公开(公告)日：1990-02-14
申请号：JP19409488
申请日：1988-08-03
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： UENO FUMIAKI , NAGASHIMA MICHIYOSHI , NANBU TARO
IPC分类号： G11B7/26
摘要： PURPOSE:To produce the master disk for an optical disk having the smooth surface free from burrs by removing a photoresist, then etching the surface of the master disk for the optical disk again by a drying etching method. CONSTITUTION:The master disk is subjected to the dry etching again after the photoresist is removed. Then, the burrs 3 project from the disk surface and are, therefore, easily etched and are removed in the time much shorter than at the time of forming pits and grooves. The master disk for the optical disk having the smooth surface free from burrs is, therefore, obtd.

72. 发明专利

JPS63217545A PRODUCTION OF OPTICAL DISK 失效
公开(公告)号：JPS63217545A
公开(公告)日：1988-09-09
申请号：JP5055287
申请日：1987-03-05
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI , UENO FUMIAKI
IPC分类号： G11B7/26
摘要： PURPOSE:To obtain a master disk formed with recording pits, the bottom of which is parallel with the slope of V-grooves and to produce a disk having high quality of reproduction signals by providing an ion milling stage in a stage for preparing the master disk. CONSTITUTION:A photoresist 8 is formed on a metallic disk 6 formed with the V-grooves and the signals are recorded thereon by a laser; thereafter, the resist is etched. An ion beam 11 is then projected thereto dig down uniformly the metallic part exposed by the etching (ion milling). Then, the metal is uniformly and increasingly dug by the ion milling and the recording pits having the bottom parallel with the slope of the original V-grooves are obtd. The photoresist is thereafter removed and the master disk is obtd. The bottom of the recording pits is paralleled with the slope of the V-grooves if the disk is prepd. by using such master disk. The disk having the high quality of the reproduction signals is thus produced.

73. 发明专利

JPS62173649A OPTICAL HEAD 失效
公开(公告)号：JPS62173649A
公开(公告)日：1987-07-30
申请号：JP1512086
申请日：1986-01-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI , TAKEMURA YOSHIYA
IPC分类号： G11B7/00 , G11B7/0055 , G11B7/135 , G11B7/30
摘要： PURPOSE:To form an optical head that can make recording, reproducing and erasing on a recording material of high melting point and long service life by placing a preheating spot in front of a melting spot. CONSTITUTION:The temperature of a recording material is raised to a certain degree in a preheating spot 10. Thereby, it becomes possible to melt the recording material exceeding a high melting point even at a melting spot 1 of light intensity distribution that can be easily attained. Then, signals can be erased slow cooled by a slow cooling spot 2. By irradiating a recording and reproducing spot 4 while remaining heat of erasing process is still left, the recording material can be molten by attainable light intensity distribution, and thereafter, signals are recorded by quenching. That is, other signals can be recorded immediately after erasing.

74. 发明专利

JPS62114131A OPTICAL REPRODUCING METHOD 失效
公开(公告)号：JPS62114131A
公开(公告)日：1987-05-25
申请号：JP25412185
申请日：1985-11-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI
IPC分类号： G11B7/00 , G11B7/005 , G11B7/135
摘要： PURPOSE:To cause interference with simple constitution by detecting each reflected light from the front face and the rear face as a half mirror from a parallel glass plate provided in a reflected optical path from a disc. CONSTITUTION:The light from a semiconductor laser 1 is reflected in a recording face 7 via a beam splitter 4 and the parallel glass plate 23 is provided in the optical path, and a beam (a) reflected in the surface 24 as the half mirror and a beam (b) reflected in the rear face 25 are detected by a photodetector F. Since the axes of the beams (a, b) are deviated a little, they are not interfered and the interference region W is observed. Thus, the 1st order or the inverse of 1st order and the 0-th order diffract lights are interfered to record/ reproduce a high frequency signal.

75. 发明专利

JPS6257134A OPTICAL WAVEFORM EQUALIZING AND REPRODUCING METHOD 失效
公开(公告)号：JPS6257134A
公开(公告)日：1987-03-12
申请号：JP19518485
申请日：1985-09-04
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI , TAKEMURA YOSHIYA , OBARA KAZUAKI
IPC分类号： G11B7/00 , G11B7/005 , G11B7/135
摘要： PURPOSE:To reproduce a signal whose waveform has been equalized optically by dividing a photodetector into two, providing a dead zone between its two divided parts, and irradiating a low frequency component to this dead zone. CONSTITUTION:A photodetector 11 is divided into two, and photodetects a reflected light from an information recording surface 5 of an optical disk 4. Between two divided parts 11a and 11b of the detector 11, a dead zone 13 is provided. To this dead zone 13, light of a long and slender area which passes through the center of an objective lens 3, and also runs along the direction (the radial direction of the disk 4) vertical to a signal track is irradiated so that the divided part 11a and 11b do not execute photodetection. Accordingly, when photodetection is executed by this photodetector 11, an amplitude of a low frequency component can be made small, and a waveform can be equalized optically by reducing a reproducing signal amplitude of a low frequency, in a state that a reproducing signal amplitude of a high frequency remains maintained. According to this method, a waveform equalizing circuit is not required, or a simple one will suffice.

76. 发明专利

JPS60234232A OPTICAL DISK AND ITS TRACKING METHOD 失效
公开(公告)号：JPS60234232A
公开(公告)日：1985-11-20
申请号：JP9052084
申请日：1984-05-07
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKEMURA YOSHIYA , OBARA KAZUAKI , NAGASHIMA MICHIYOSHI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/09 , G11B7/095 , G11B7/24
摘要： PURPOSE:To reduce the circuit scale by varying the depth of a V groove on an optical disk every second track and in a fixed cycle and therefore increasing the record area on a sloping surface and also detecting only the cycle by a tracking control circuit. CONSTITUTION:A pilot signal is recorded to a V groove every second track of an optical disk 1 at a frequency (f) and with the depth varied periodically. The track depth is changed with the amplitude frequency (f) on sloping surfaces A and B respectively with the fixed depth kept for tracks of sloping surfaces C and D. When the reflected light sent from the disk 1 is received by photodetectors M and N and a laser spot is shifted toward a sloping surface E, the intensity is increased for the pilot signal of a frequency (f) detected by the detector M. While the intensity of the pilot signal detected by the detector N is reduced. Therefore two laser spots can be tracked on both surfaces C and D by having the same intensity between reproduction pilot signals of detectors M and N. This eliminates the need to switch the control polarity, and it is desired for a tracking control circuit to detect just the frequency (f). Thus the scale of the tracking control circuit can be reduced.

77. 发明专利

JPS60185904A SINGLE ELEMENT PLATE LENS 失效
公开(公告)号：JPS60185904A
公开(公告)日：1985-09-21
申请号：JP4155584
申请日：1984-03-05
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI
IPC分类号： G02B5/18 , G02B3/08 , G02B5/30 , G02B5/32
摘要： PURPOSE:To obtain the single element plate lens with a high numerical aperture which converges laser light into a fine spot by forming a fine striped pattern like a hologram lens and a Fresnel lens on both surfaces of a transparent plate. CONSTITUTION:A hologram or Fresnel zones 2 and 3 are formed on both surfaces of the transparent plate 1. Incident laser light (a) is converged through the striped pattern 2 toward a point P as a light beam (b) and the numerical aperture sintheta1 at this time is 0.2-0.3 at most. Then, it is converged on a point Q as a light beam C through the striped pattern 3 and the numerical aperture sintheta2 is increased to about 0.5, but the striped pattern 3 operates as a lens with a 0.2- 0.3 numerical aperture to the light beam (b), and aberrations are reduced enough to ignore.

78. 发明专利

JPS60117423A RECORDING AND REPRODUCING METHOD OF OPTICAL DISC 失效
公开(公告)号：JPS60117423A
公开(公告)日：1985-06-24
申请号：JP22472383
申请日：1983-11-29
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/09
摘要： PURPOSE:To track two spots by making the interval between centers of two laser spots in the radial direction of a disc slightly shorter or longer than a half of the interval between mountains of V grooves. CONSTITUTION:The interval between centers of two laser spots in the radial direction of the disc is made shorter than a half of the interval between mountains of V groooves by 2delta. When the interval between mountains of V grooves is denoted as P, a 2sin(2pidelta/P)-fold signal of a tracking signal due to one laser spot is obtained. In this case, a recording part (recording bits) 22 is obtained on a recording material thin film 21. The upper limit of the length delta is deltamax=(P/2- nu)/2 where nu is the width of recording bits 22 for the purpose of preventing overlap of recording bits 22-1 and 22-2. For example, if the track pitch P is 1.6mum and the recording bit width nu is 0.6mum, the upper limit deltamax is 0.1mum, and the tracking signal from two spots is >=77% of that due to only one spot and is enough.

79. 发明专利

JPS58155528A OPTICAL DISC RECORDING AND REPRODUCING SYSTEM, OPTICAL DISC AND ITS MANUFACTURE 失效
公开(公告)号：JPS58155528A
公开(公告)日：1983-09-16
申请号：JP3848182
申请日：1982-03-10
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAGASHIMA MICHIYOSHI , TAKENAGA MUTSUO
IPC分类号： G11B7/007 , G11B7/09 , G11B7/24
摘要： PURPOSE:To attain the recording or reproduction of high density information, by recording sreviously tracking signals of different frequencies on the top and the bottom of a V-shaped or inverted trapezoidal grooves as pits in advance, and tracking the optical spot at the center of a tilt surface of the groove. CONSTITUTION:Grooves having V-shaped or trapezoidal radial cross section are provided on the optical disc, signals in frequency f1 are formed on the top and signals in frequency f2 are formed on the top as tracking pits, for example. Laser light is collected and irradiated on the optical disc, and when the distribution (b) of light intensity is obtained with a little shift from the center of the tilt surface to the top, the change in the amount of light in the frequency f2 is larger than that in the frequency f1, and when the optical beam is shifted to the bottom inversely (distribution c), the change in the amount of light in frequency f1 is larger. Thus, the tracking to the center of the tilt surface is executed by making the amplitude of the change in the amount of light changing in the two frequencies f1, f2 equal with each other.

80. 发明专利

JPS5687239A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS5687239A
公开(公告)日：1981-07-15
申请号：JP16535979
申请日：1979-12-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： YOSHIDA TOMIO , NAGASHIMA MICHIYOSHI , ICHINOSE AKIRA , WAKAMI NOBORU
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/125 , G11B7/126
摘要： PURPOSE:To obtain uniform recording and reproduction quality from an outer circumference to an inner circumference and to obtain the duty ratio of a recording signal nearly equal to that of recording, by controlling recording energy by an optical disk device. CONSTITUTION:As for a disk rotating at a constant rotational frequency, its recording energy should be adjusted to the best value at its outer circumference and inner circumference respectively. For this purpose, a recording signal is applied to terminal A and while constant AC current IAC is supplied to semiconductor laser LD without reference to a recording place on the disk, DC current IDC flowing through semiconductor laser LD is controlled with a current flowing to point D. Consequently, DC current IDC that corresponds to the recording place on the disk can be flowed by applying terminal B with a potential that indicates the irradiation position of light on the disk.

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