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71. 发明专利

JPH02103752A OPTICAL DISK AND ITS PRODUCTION 失效
公开(公告)号：JPH02103752A
公开(公告)日：1990-04-16
申请号：JP25471388
申请日：1988-10-12
申请人： HITACHI LTD
发明人： YANAGIHARA HITOSHI , TOKUJIYUKU NOBUHIRO , ISHIGAKI MASAHARU
IPC分类号： G11B7/26 , G11B7/00 , G11B7/0045 , G11B7/007 , G11B7/14 , G11B7/24
摘要： PURPOSE:To perform satisfactory cutting by using two beams to form pits with a uniform track pitch even when single pits corresponding to an information signal are different in pit width from one another. CONSTITUTION:A first beam to cut a user area 3 and a standard formatted part (SFP) and a second beam to form a pit wider than the pit formed by the first beam are prepared, and a phase encoded par (PEP) is cut by the second beam. Or optical axes of first and second beams are shifted from each other and the PEP is cut with the same modulation signal by both beams. Thus, a discontinuous part of the track pitch is eliminated, and satisfactory cutting is performed.

72. 发明专利

JPH01269250A OPTICAL DISK AND FORMATION OF PIT THEREOF 失效
公开(公告)号：JPH01269250A
公开(公告)日：1989-10-26
申请号：JP9551488
申请日：1988-04-20
申请人： HITACHI LTD
发明人： YANAGIHARA HITOSHI , NOGAMI HIROSHI , TOKUJIYUKU NOBUHIRO , ISHIGAKI MASAHARU , FUKUI YUKIO
IPC分类号： G11B7/26 , G11B7/00 , G11B7/004 , G11B7/24
摘要： PURPOSE:To nearly flatten the percentage modulation of a bit signal within the range of a recording area by setting the width of the pits disposed on the inside circumferential side in the radial direction of the disk at the length equal to or larger than the width of the pits disposed on the outside circumferential side. CONSTITUTION:The pits are formed on the master disk of the optical disk while the width of the pits on the inside circumferential side in the radial direction of the disk is set larger than the width of the pits on the outside circumferential side and the pit area is maintained nearly constant. A glass plate 28 having a photoresist film 29 is disposed on the reading surface of a cutting machine and is rotated around a revolving center shaft 30 for the above- mentioned purpose. The photoresist film 29 is irradiated by laser light 20 from an He-Cd laser generator 21 via an irradiation power control part 22, a mirror 23, a collimating lens 24, an optical modulator 31, a collimating lens 32, a mirror 33, and a head moving part 25, by which the film is cut and the pits are formed thereon. The irradiation density is properly controlled by the control part 22 at this time.

73. 发明专利

JPS63187480A OPTICAL DISK 失效
公开(公告)号：JPS63187480A
公开(公告)日：1988-08-03
申请号：JP1836387
申请日：1987-01-30
申请人： HITACHI LTD
发明人： KODERA YOSHIE , ISHIGAKI MASAHARU , TAKEUCHI TAKASHI , MATSUMOTO SEIICHIRO
IPC分类号： G11B23/00 , G11B7/24
摘要： PURPOSE:To relieve the stress load onto a disk medium by adhering a magnetic substance to a substance having a smaller elastic rate than that of a disk medium such as a rubber material so as to absorb the thermal expansion difference between the magnetic substance and the nonmagnetic substance. CONSTITUTION:The magnetic substance 7 is adhered to a polycarbonate made optical disk 1 formed such as a circle, the magnetic substance 7 is formed incorporatedly by a insert forming of a rubber material 5, after alignment to a disk track, the substance is adhered by an adhesives. The linear expansion coefficient of the magnetic substance 7 used for a magnet clamp (magnet chuck type clamp) is smaller in the order of one digit than that of the plastic material 6 as the optical disk medium in general, and the optical disk medium is expanded by heat in using the disk 1 at a high temperature, and the rubber material 5 is expanded similarly. On the other hand, since the magnetic substance 76 has smaller expansion than that of the plastic 6, a hearing stress is caused in the rubber material 5 and the elastic elongation of the rubber material 5 is caused. Thus, the shear stress onto the disk medium is reduced, then the change in the double refraction of the disk 1 and the bent disk are reduced or prevented.

74. 发明专利

JPS62256230A OPTICAL DISK 失效
公开(公告)号：JPS62256230A
公开(公告)日：1987-11-07
申请号：JP9673386
申请日：1986-04-28
申请人： HITACHI LTD
发明人： ISHIGAKI MASAHARU , FUKUI YUKIO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/24
摘要： PURPOSE:To quickly and surely discriminate two tracks to be subjected to reproduction scanning, by respectively providing track discriminating signal areas in a luminance signal recording area and color difference signal recording area and giving the same number to the guide tracks of the same order. CONSTITUTION:In the outer peripheral section of an optical disk 1 a luminance signal recording area 2 is provided and a color difference signal recording area 4 is provided at the inside of the area 2. The 1st track discriminating signal area 3 is provided in a part of the area 2 the 2nd track discriminating signal area 5 is provided in a part of the area 4. A series of track numbers are separately given to the areas 3 and 5 from the inner peripheral sections to the outer peripheral sections in the order of guide tracks. It is desirable to add codes to the tracks numbers in order to eliminate malfunctions of a track retrieval. Moreover, it is possible to provide a separating area 6 between the areas 2 and 4, to form the 3rd track discriminating area 7 in a part of the area 6, and to give a series of track numbers which has no relation with the track numbers of the areas 3 and 5 to the area 7. It is also possible to provide a separating area 8 having no guide track.

75. 发明专利

JPS62170027A INFORMATION RECORDING MEDIUM AND RECORDING/REPRODUCING METHOD 失效
公开(公告)号：JPS62170027A
公开(公告)日：1987-07-27
申请号：JP995586
申请日：1986-01-22
申请人： HITACHI LTD
发明人： ISHIGAKI MASAHARU , ONUKI HIDEO , FUKUI YUKIO , INOUE MASAYUKI , ONISHI KUNIKAZU
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/013 , G11B7/24 , G11B7/30
摘要： PURPOSE:To improve the recording density and transfer speed by providing a series light beam guiding tracks at the intervals of a length of information pits formed on a recording film in the track direction by a recording and reproducing light beam. CONSTITUTION:A beam 14 from a semiconductor 11 is collimated by a lens 12 and collected on a recording film 8 of a recording medium 3 via a mirror 13 and a lens 15 and the transmission beam of the medium 3 is received by a split diode D17. The light image of the irradiated part of a beam spot 2 on the recording film 8 is produced on the diode D17 by the interference caused by the presence of rugged pre-pits 1 arranged at a pitch W. The output of each detection element of the diode D17 is lowered when the spot 2 is irradiated to the pre-pits 1 in response to the position of adjacent pre-pit strings of the spot 2. Thus, the position of the spot 2 to the pre-pit string is detectable depending on the relation of the amplitude of the output and the tracking control of the spot 2 is attained by the detection output.

76. 发明专利

JPS61188752A SYSTEM FOR OPTICAL INFORMATION RECORDING 失效
公开(公告)号：JPS61188752A
公开(公告)日：1986-08-22
申请号：JP2825585
申请日：1985-02-18
申请人： HITACHI LTD
发明人： OISHI SATORU , TOKUJIYUKU NOBUHIRO , KODERA YOSHIE , ISHIGAKI MASAHARU
IPC分类号： G11B7/24 , G11B7/00 , G11B7/004
摘要： PURPOSE:To improve a tracking and focusing performance as well as obtain large reproduction signals by using optical recording discs having a layer and a light absorbing layer which can cause dispersion or phase transposition between the layers to raise a reflectance before writing. CONSTITUTION:A recording medium consists of the substrate 1 made of a transparent material coated on one side with the first vapor deposition layer 2 of Sb2Se3 which is further coated with the second vapor deposition layer 3 of Bi. Optical characteristics such as reflectance of the first layer are variable due to heating or other treatment, and the second layer has absorbency of light for writing. These characteristics are selected to have a sort of like spectral characteristic 4 so that a minimum reflectance occurs due to interface between two films at wavelength lambda0. This enables writing to cause a large change in reflectance, and therefore, a large reflectance before writing, assuring increase in the quantity of incident light on a photo detector for controlling focusing and tracking and resulting in a stable control operation.

77. 发明专利

JPS61151852A OPTICAL DISK RECORDING CARRIER 失效
公开(公告)号：JPS61151852A
公开(公告)日：1986-07-10
申请号：JP27301484
申请日：1984-12-26
申请人： HITACHI LTD
发明人： ISHIGAKI MASAHARU , FUKUI YUKIO , MIURA YOSHIO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/007 , G11B7/24
摘要： PURPOSE:To improve the transcription properties in an injection molding or injection compression molding mode by setting the ratio between the width of an address bit and a tracking pitch at 1/8-1/4. CONSTITUTION:An optical disk is produced by coating a phase transfer type recording films, e.g., Sb2Se3 and Bi films which absorb the laser light to change their optical characteristics including the reflection factor, the transmittance, the diffractive index, etc. on the surface of a plastic substrate 3 of acrylic substance, polycarbonate, etc. containing an address bit 1 having the depth of 1/8 wavelength of the semiconductor laser light for record/reproduction and a guide groove 2. The ratio W/P between the width W of the bit 1 and the groove 2 and the track pitch P is set at 1/8-1/4. As a result, the transcription properties of the address bit are improved in an injection molding or injection compression molding mode. Furthermore the level of an address reproduction signal level is also raised up to secure the accurate demodulation of an address.

78. 发明专利

JPS6173255A Method for driving optical recording tape 失效
标题翻译：驱动光学记录带的方法
公开(公告)号：JPS6173255A
公开(公告)日：1986-04-15
申请号：JP19254084
申请日：1984-09-17
申请人： Hitachi Ltd
发明人： OISHI SATORU , ISHIGAKI MASAHARU , KODERA YOSHIE , TOKUJIYUKU NOBUHIRO
IPC分类号： G11B7/00 , G11B7/003 , G11B15/28
摘要： PURPOSE: To set a head to a non-contacted condition with a tape so as to prevent the tape from being vibrated, by forming a magnetic film on one side of a base body, on the other side of which a recording film is formed, and attracting the magnetic film to a cylinder, and then, providing an information record reading out head opposing to the tape with the cylinder in between.
CONSTITUTION: An optical recording tape 1 is provided with a magnetic film 4 formed by vacuum-depositing a magnetic substance, such as nickel, cobalt, etc., on one side of a base body 2, on the other side of which a recording film 3 is formed. The optical recording tape 1 is brought into contact with a cylinder which rotates at a peripheral speed (of the outer periphery) equal to the running speed of the tape 1 and is made of a resin, such as acrylic resin, polycarbonate, etc., and a transparent head 7 for recording and reading out information by means of irradiated lights 8 is provided at the outer periphery of the cylinder 5. A magnet 6 facing to the head 7 is provided in the cylinder 5 and the optical recording tape 1 is closely contacted with the outer peripheral surface of the cylinder 5 by means of the attracting force of the magnet 6 and the tape 1 is run under the closely contacted condition.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：为了通过在磁带的一侧形成磁性膜，在磁带的另一侧上形成记录膜，为了将磁头设置为非接触状态，以防止磁带振动，并将磁性膜吸引到圆柱体上，然后提供一个信息记录读出与磁带相对的磁头，气缸在其间。构成：光记录带1设置有通过在基体2的一侧上真空沉积诸如镍，钴等的磁性物质而形成的磁性膜4，另一侧具有记录膜 3形成。光记录带1与以与带1的行进速度相等的圆周速度旋转的圆筒（例如丙烯酸树脂，聚碳酸酯等）等树脂形成，并且在气缸5的外周设置有用于通过照射光8记录和读出信息的透明头7.在气缸5中设有面向头部7的磁体6，光记录带1紧密地通过磁铁6的吸引力与气缸5的外周面接触，带1在紧密接触的状态下运行。

79. 发明专利

JPS60164937A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPS60164937A
公开(公告)日：1985-08-28
申请号：JP1990984
申请日：1984-02-08
申请人： HITACHI LTD
发明人： ISHIGAKI MASAHARU , OONISHI KUNIKAZU
IPC分类号： B41M5/26 , G11B7/24 , G11B7/243 , G11B7/257
摘要： PURPOSE:To multiply the rate of utilizing heat from a light absorptive layer and to improve recording sensitivity by forming successively the 1st phase change layer, the light absorptive layer and 2nd phase change layer on a substrate then forming a protective layer thereon. CONSTITUTION:The 1st phase change layer 1 of which the light absorption rate is small with writing light, for example, semiconductor laser light having 830nm wavelength and of which the optical characteristics such as reflectivity, transmittivity, refractive index, etc. change by >=10% with mainly heat is provided on a semi-transmittable glass substrate or a resin substrate 3 consisting of an acrylic resin, etc. A light absorptive layer 2 having large light absorptivity with the laser light and has the effect of converting said light to heat by said absorption is provided thereon. The 2nd phase change layer 5 similar to the 1st layer is further provide thereon to form a recording film having the three-layered structure. The recording film 8 is protected by a protective layer 4 of SiO2, AI2O3 or resin, etc. The information recording medium having high recording property and good stability is thus formed.

80. 发明专利

JPS59186154A Manufacture of mother disc for video disc 失效
标题翻译：母碟的制作
公开(公告)号：JPS59186154A
公开(公告)日：1984-10-22
申请号：JP6070883
申请日：1983-04-08
申请人： Hitachi Ltd
发明人： ISHIGAKI MASAHARU , OOISHI SATORU , KODERA YOSHIE , NICHIBE HISASHI , FUKUI YUKIO
IPC分类号： G11B7/26 , B29C33/00 , B29C61/00 , B29D17/00 , G11B23/00
CPC分类号： G11B23/0057
摘要： PURPOSE:To obtain a mother disc from which plural stampers are obtained and where monitoring at laser recording is possible and the shape of pit is excellent by performing prescribed processes after forming sequentially the 1st metallic layer, a synthetic resin layer and the 2nd metallic layer on a substrate. CONSTITUTION:The 1st metallic layer 22, the synthetic resin layer 23 made of a positive photoresist, and the 2nd metallic layer 24 are formed sequentially on the substrate 21 made of glass or the like. The thickness of the metallic layer 22 is selected as the pit depth and the total thickness of the synthetic resin layer 23 and the metallic layers is selected as 1/4 of the wavelength of monitor light. Then, a laser beam modulated by a video signal is irradiated in the form of pattern on the metallic layer 24 to remove the metallic layer 24 and the synthetic resin layer 23 of the irradiated part. After the metallic layer 22 is etched by sputtering by using the pattern as a mask, the synthetic resin layer 23 and the metallic layer 24 are removed. Then, a thin layer 26 made of Cr or the like is formed, a metal 27 is plated, and then the plated layer 27 is exfoliated, thereby obtaining the mother disc from which plural stampers are obtained with excellent pit forms.
摘要翻译：目的：为了获得能够获得多个压模的母盘，并且可以通过在顺序地形成第一金属层，合成树脂层和第二金属层之后进行规定的处理，可以进行激光记录监视，并且凹坑的形状优异底物。构成：第一金属层22，由正性光致抗蚀剂制成的合成树脂层23和第二金属层24依次形成在由玻璃等制成的基板21上。选择金属层22的厚度作为凹坑深度，合成树脂层23和金属层的总厚度选择为监视光的波长的1/4。然后，将通过视频信号调制的激光束以图案的形式照射在金属层24上，以去除被照射部分的金属层24和合成树脂层23。在通过使用图案作为掩模通过溅射对金属层22进行蚀刻之后，去除合成树脂层23和金属层24。然后，形成由Cr等制成的薄层26，镀金属27，然后剥离镀层27，从而获得母板，从而获得具有优良凹坑形式的多个压模。

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