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1. 发明专利

JPH0863792A OPTICAL DISK AND ITS PRODUCTION 失效
公开(公告)号：JPH0863792A
公开(公告)日：1996-03-08
申请号：JP19511294
申请日：1994-08-19
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIWA HIROAKI , SUDO RYOICHI , TAJIMA TETSUO , KOSHO HITOSHI , YASUI TOSHIAKI
IPC分类号： G11B7/24 , G11B7/26
摘要： PURPOSE: To obtain an optical disk having high accuracy and excellent reliability by providing this optical disk with a sectional structure formed by sticking a pair of transparent substrates formed with at least one layer of recording films on information pattern layers with adhesives. CONSTITUTION: This disk has a disk shape bored with a hole 34 at its center. The optical disk is arranged in the spacing between a pair of the substrates facing each other and consists of the cured matter of the two-part curing type silicone adhesives. The substrates 3 have the transparent replica substrates 1 and metallic films (recording films) 2 for recording and are disposed to face each other in such a manner that the recording films 2 exist on the inner side. The substrates 1 are medium to allow transmission of lasers for recording and reproducing. Glass, polyolefin, etc., which are optically isotropic and have optical distortions of, for example,

2. 发明专利

JPH06131705A DEVICE FOR ADHERING OPTICAL DISK 失效
公开(公告)号：JPH06131705A
公开(公告)日：1994-05-13
申请号：JP27833992
申请日：1992-10-16
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIWA HIROAKI , SUDO RYOICHI , TAJIMA TETSUO , YASUI TOSHIAKI
IPC分类号： B29C65/52 , B29C43/56 , B29C65/00 , B29C65/48 , B29D17/00 , B29L9/00 , B29L31/00 , G11B7/26
摘要： PURPOSE:To make high-speed and highly accurate adhering possible and to reduce the deformation in use and the deformation and stripping off at the time of storage by making a mold which forms a tightly sealed space a separated mold so as to be extended and contracted and pressurizing a substrate through a mold in which atomospheric pressure is contracted when the inside of the mold is evacuated. CONSTITUTION:A cap 4 on which an upper die 16 is fixed is detached from a cylinder 3 in a state in which the cylinder 3 is pushed up by an air cylinder 6, one substrate 17 of two hub substrates 17 coated with adhesives is arranged on a lower die 11 fixed at the center part of a piston 2 while the substrate is inserted through a center pin 12 and the other substrate 17 having the hub for which a magnet 15 is adsorbed is arranged on the pin 12. The tightly sealed space 1 is evacuated by a vacuum pump 9. Then the valve of the pump 9 is closed, the pressure in the cylinder 6 is decreased by pushing up the cylinder 3, the support of the cylinder 3 is released, the pressure in the cylinder 3 and the cap 4 is decreased to the atmospheric pressure, the substrate supported by the pin 12 and the magnet 15 is pushed down by means of the die 16 and is adhered to the other substrate arranged on the die 11.

3. 发明专利

JPH0817073A OPTICAL DISK AND ITS PRODUCTION 失效
公开(公告)号：JPH0817073A
公开(公告)日：1996-01-19
申请号：JP14665994
申请日：1994-06-28
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIWA HIROAKI , SUDO RYOICHI , TAJIMA TETSUO , YASUI TOSHIAKI
IPC分类号： G11B7/24 , G11B7/26
摘要： PURPOSE:To suppress the deterioration of an optical disk due to an adhesive layer during production, use and preservation. CONSTITUTION:Two substrates 3 each consisting of a recording film 2 and a transparent substrate 1 are coated with an adhesive contg. 95-75% UV-curing monofunctional acrylic resin and 5-25% UV-curing epoxy resin to form adhesive layers 4. The two transparent substrates are placed opposite to each other with the adhesive layers inward and they are press-bonded.

4. 发明专利

JPH0567354A OPTICAL DISK AND PRODUCTION THEREOF 失效
公开(公告)号：JPH0567354A
公开(公告)日：1993-03-19
申请号：JP5129792
申请日：1992-03-10
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIWA HIROAKI , SUDO RYOICHI , TAJIMA TETSUO , YASUI TOSHIAKI
IPC分类号： G11B7/26 , G11B7/24
摘要： PURPOSE:To lessen the deformation by a high-speed access and high-speed rotation by having a sectional structure in which a pair of transparent substrates formed with at least one layer of recording films are stuck to each other by an adhesive on an information pattern surface. CONSTITUTION:This optical disk has the sectional structure in which a pair of the transparent substrates formed with at least one layer of the recording films are stuck to each other by the adhesive on the information pattern surface. The optical disk has

5. 发明专利

JPS62246157A METHOD AND DEVICE FOR DEVELOPING OPTICAL DISK MASTER 失效
公开(公告)号：JPS62246157A
公开(公告)日：1987-10-27
申请号：JP8802586
申请日：1986-04-18
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ITO SHO , YASUI TOSHIAKI
IPC分类号： G11B7/26 , G03F7/00 , G03F7/30
摘要： PURPOSE:To attain an excellent uniform development capacity and realize good reproducibility and easy handling by quickly moving a developing tank with an air cylinder and quickly immersing a photoresist disk in a developer to start development and tacking out the disk from the developer and pouring water onto the disk like a shower simultaneously to quickly stop development. CONSTITUTION:A glass disk 2 to which a photoresist film 1 to which a signal pattern is exposed is stuck is fixed onto a turntable 23 by vacuum. A shaft 5 starts to slowly rotate, and a photoresist disk 15 is completely immersed in a developer 16 to start development, and formation of a rugged pattern is started, and the diffracted light of the first order of an He-Ne laser light diffracted by this rugged pattern is made incident on a sensor 9. When a ratio of the output of the diffracted light sensor 9 to that of a light-transmissive sensor 8 reaches a certain value, discharge of the developer 16 is started, and a pure water 21 is poured onto the photoresist film 1 like a shower, and the photoresist disk 15 is put in pure water when the quantity of the pure water reaches a certain value.

6. 发明专利

JPH08171743A OPTICAL MASTER DISK AND ITS CUTTING METHOD 失效
公开(公告)号：JPH08171743A
公开(公告)日：1996-07-02
申请号：JP31345594
申请日：1994-12-16
申请人： HITACHI MAXELL , HITACHI LTD
发明人： YASUI TOSHIAKI , KATO KEIZO , ITO SHO
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/26
摘要： PURPOSE: To obtain an optical master disk capable of stably forming rugged patterns in which slender and deep pits corresponding to prepits and shallow grooves corresponding to guide grooves coexist. CONSTITUTION: A photoresist layer is formed on a substrate and the deep pits which are the basis for the prepits and the shallow grooves which are the bases for the guide grooves are cut on this photoresist layer. A photoresist material which is formed by using a novolak resin having a ratio Mw/Mn of =40000 therefrom as a base and contains a diazide photosensitive agent having a parameter A of 0.7 to 0.8 and the absorbance of light of a wavelength 458nm of 1/5 to 1/20 the absorbance of light of a wavelength of about 365nm is used as the photoresist material for forming the photoresist layer described above.

7. 发明专利

JPH0384748A OPTICAL INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH0384748A
公开(公告)日：1991-04-10
申请号：JP21855889
申请日：1989-08-28
申请人： HITACHI MAXELL , HITACHI LTD
发明人： YASUI TOSHIAKI , NUNOMURA TOYOYUKI , WATANABE HITOSHI , YAGI MASAHIDE , ITO SHO
IPC分类号： G11B7/24
摘要： PURPOSE:To provide a higher recording density and smaller crosstalks by adequately adjusting the depth of guiding grooves according to the sectional shape and pitch of the guiding grooves. CONSTITUTION:The guiding grooves 4 are formed to have the depth d1 of (lambda/10n to lambda/16n)X(1.5 to 1.6) when the sectional shape of the guiding grooves 4 is formed to an approximately triangular shape, the pitch P of the refractive index to 1.0 to 1.5 mum and the wavelength of light for reproducing as lambda and the refractive index of a transparent substrate 2 as (n). Many tracks can be arranged in the recording of a specified area and the recording density in the direction where the guiding grooves are arranged is increased when the track pitch is diminished. The wavelength of the light for recording/reproducing is shortened and the pitch length of prepits and add-on pits is shortened as the track pitch is smaller and, therefore, the recording density can be increased in the direction along the guiding grooves as well. On the other hand, the crosstalks are decreased when the guiding grooves of the smaller pitch are formed in such a manner.

8. 发明专利

JPS63225945A MAGNETO-OPTICAL DISK 失效
公开(公告)号：JPS63225945A
公开(公告)日：1988-09-20
申请号：JP5882887
申请日：1987-03-16
申请人： HITACHI LTD , HITACHI MAXELL
发明人： NIIHARA TOSHIO , ITO SHO , SHIGEMATSU KAZUO , KAKU TOSHIMITSU , YASUI TOSHIAKI , OTA NORIO , YOSHIHIRO MASASHI
IPC分类号： G11B11/10 , G11B7/09 , G11B11/105
摘要： PURPOSE:To obtain an optimum tracking signal when a transparent film having the refractive index larger than the refractive index of the substrate is provided between the substrate and a recording film by determining the depth of V-grooves at the depth smaller than lambda/6 and larger than lambda/8 with respect to the wavelength lambda of laser light to be projected on a disk. CONSTITUTION:A UV curing resin layer 2 for making V-shaped guide grooves 6 having lambda/6-lambda/8 depth is provided on the glass substrate 1. After the inside of a sputtering device is evacuated to a vacuum at 100 deg.C, the substrate is loaded into said device and the transparent film having n=1.9-2.14 refractive index and 750-900Angstrom thickness, for example, a thin film 3 of Si3N4 having n=2.07 and 850Angstrom thickness is deposited on the substrate. The angle of Kerr rotation of the magnetic film is increased by utilizing the interference in the film. A quaternary amorphous magnetic film 4 consisting of TbFeCoNb is successively deposited on said film by changing the target, following which a protective film 5 consisting of Si3N4 is deposited thereon. The magneto-optical disk having the depth of the guide grooves with which the optimum tracking signal is obtainable without decreasing the degree of modulation of the tracking signal in the case of using the transparent film having a high refractive index is obtd. as the angle of Kerr rotation is increased by this constitution.

9. 发明专利

JPH03130948A OPTICAL INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH03130948A
公开(公告)日：1991-06-04
申请号：JP12296190
申请日：1990-05-15
申请人： HITACHI MAXELL , HITACHI LTD
发明人： YASUI TOSHIAKI , WATANABE HITOSHI , ITO SHO , SHIGEMATSU KAZUO
IPC分类号： G11B7/24 , G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain optimum push-pull signals and to stabilize tracking characteristics by forming the guide grooves of the medium provided with prepit arrays between the guide grooves of specific intervals to a V-shaped section and specifying the width and depth of the grooves. CONSTITUTION:The magneto-optical disk is formed by sticking two sheets of veneers 10, 10a to each other via an adhesive layer 11 and is formed with the guide grooves 2 at 1.0 to 2.0mum intervals on the veneers 10, 10a. The prepit arrays 3 are provided therebetween. The grooves 3 are formed to the V-shaped section and the width W and depth (d) thereof are specified to the values expressed by equation I, equation II when the wavelength of a laser beam is designated as lambda, the numerical aperture of an optical head as NA and the refractive index of a transparent substrate 4 as ns. The push-pull signals attain the max. value at the specific groove depth and the max. value increases when the groove width increases. The optimum push-pulls signals are obtd. by regulating the width and depth of the grooves to a prescribed range. The tracking characteristics are thereby stabilized.

10. 发明专利

JPS63171445A OPTICAL MASTER DISK MANUFACTURING EQUIPMENT 失效
公开(公告)号：JPS63171445A
公开(公告)日：1988-07-15
申请号：JP161687
申请日：1987-01-09
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ITO SHO , WATANABE HITOSHI , YASUI TOSHIAKI , TSUNODA YOSHITO
IPC分类号： G11B7/135 , G11B7/09 , G11B7/26
摘要： PURPOSE:To attain the position control of a light spot on a photosensitive layer by controlling one or two incident angles to a prescribed value. CONSTITUTION:The light from a laser light source 1 is separated by a splitter 2 and subjected to intensity modulation according to the signal by an optical modulation deflector 4 and an optical modulator 3. Two recording lights 100, 200 receiving modulation and deflection are synthesized by a beam splitter 5 and formed as two light spots on the photosensitive layer 13 on a disk 12. A beam sampler 17 is placed between a lens 9 and a mirror 11 and the extracted two recording lights are formed on photodetectors 19, 19'. An output corresponding to a deviation from the center of the detectors 19, 19' is obtained by arithmetic units 20, 20' and each recording light is deflected to control the position of the light spot on the photosensitive layer 13.

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