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41. 发明专利

JPH0464933A BOTH SIDES SIMULTANEOUS RECORDING AND REPRODUCING OPTICAL DISK, ITS PRODUCTION, AND OPTICAL DISK DEVICE USING THE DISK 失效
公开(公告)号：JPH0464933A
公开(公告)日：1992-02-28
申请号：JP17635190
申请日：1990-07-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMURA YOSHINORI , NIIHARA TOSHIO , TERAO MOTOYASU
IPC分类号： G11B23/36 , G11B7/007 , G11B7/14 , G11B7/24 , G11B7/26 , G11B19/02 , G11B19/12 , G11B20/12 , G11B23/42
摘要： PURPOSE:To simultaneously read and write data on both sides by symmetrically arranging address pits or the like to be preliminarily formed so that they have the same contents by forward reproducing and backward reproducing. CONSTITUTION:Digital code '=A.B.C' corresponding to an address signal is concentrically or spirally exposed on the photo resist on the surface of a rotating glass substrate in the order of left digital information 3. After separation information 2 '-' is exposed, information 3 '=A.B.C' is reproduced in the opposite order, and right digital information 4 is so exposed that '=A.B.C' is correctly arranged. The exposed photo resist surface is developed and a photosensitive part is dissolved to form the address pit array of a track number or a sector number. By the simple method to combine two disk substrates obtained in this manner, optical heads are arranged on both sides of a disk and data on both sides are simultaneously recorded or reproduced to increase the access speed.

42. 发明专利

JPH0417140A METHOD OF MAGNETO-OPTICAL RECORDING/REPRODUCING, MAGNETO-OPTICAL RECORDING/REPRODUCING DEVICE AND RECORDING MEDIUM TO BE USED THEREFOR 失效
公开(公告)号：JPH0417140A
公开(公告)日：1992-01-21
申请号：JP12103190
申请日：1990-05-10
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAMOTO JIICHI , NIIHARA TOSHIO , TERAO MOTOYASU , OTA NORIO , TODA TAKESHI , SUKETA YASUSHI
IPC分类号： G11B11/10 , G11B11/105
摘要： PURPOSE:To enable overwriting with high sensitivity without a danger of erasing the recorded information with reproducing light by applying a bias magnetic field on the magneto-optical recording medium in a different direction or with different intensity from the bias magnetic field used on recording when the recorded information is to be reproduced. CONSTITUTION:Magnetization of the first magnetic layer 3 of the medium is transferred to the second magnetic layer 4 with reproducing bias magnetic field on overwriting, and thereby, the first magnetic layer 3 and the second magnetic layer 4 have the same magnetization direction. In this state, a light beam for reproducing is made to irradiate the medium. The magnetization of the first magnetic layer 3 and second magnetic layer 4 is oriented to give exchange coupling to each other, and this state is stable and can not be changed even when the reproducing light has same intensity as the low level of light for recording. Thereby, breaking of the recorded information is avoided even when irradiated by reproducing light of large intensity, and high-sensitive overwriting can be performed.

43. 发明专利

JPH0414635A INFORMATION RECORDING MEMBER 失效
公开(公告)号：JPH0414635A
公开(公告)日：1992-01-20
申请号：JP11758190
申请日：1990-05-09
申请人： HITACHI LTD , HITACHI MAXELL
发明人： ANDO KEIKICHI , TERAO MOTOYASU , TAMURA NORIHITO , MIYAUCHI YASUSHI , NISHIDA TETSUYA , OTA NORIO
IPC分类号： G11B7/24
摘要： PURPOSE:To prevent dimensional changes of the substrate surface due to recording laser beam and to prevent decrease in recording sensitivity by providing protective layers essentially comprising oxides, sulfides, carbides, serenides, nitrides, etc., in a multilayer structure adjacent to a recording thin film. CONSTITUTION:The first protective layer 3 is a thin film essentially comprising oxide, nitride, or carbide and has the thermal conductivity between >= 8 W/m.K and = 10 W/m.K and

44. 发明专利

JPH0369716B2 失效
公开(公告)号：JPH0369716B2
公开(公告)日：1991-11-05
申请号：JP14291180
申请日：1980-10-15
申请人： HITACHI LTD
发明人： TERAO MOTOYASU , HORIGOME SHINKICHI , MITSUYA MUNEHISA , OOTA SAKAE , SHIGEMATSU KAZUO
IPC分类号： B41M5/26 , G11B7/243 , G11B7/26

45. 发明专利

JPH03158298A REGENERATED PAPER WITH MEMORY UNIT AND SYSTEM THEREOF 失效
公开(公告)号：JPH03158298A
公开(公告)日：1991-07-08
申请号：JP29731089
申请日：1989-11-17
申请人： HITACHI LTD
发明人： HATANO HIDEKAZU , FUJISAWA HIROMICHI , FUJINAWA MASAAKI , TERAO MOTOYASU
IPC分类号： B42D15/10 , G06F3/12 , G06K19/00 , G06K19/077
摘要： PURPOSE:To erase printed information, and to use a form any number of times by manufacturing paper, on which a retrieved document is printed, in a regenerated paper system with a regenerative memory unit. CONSTITUTION:Regenerated paper 30 with a memory unit is composed of paper 10 coated with a liquid, in which a dye and an organic high molecular compound are dissolved in a solvent, and the memory unit 20 and a memory 21, which are bonded with paper 10 and in which information is stored. When heat 40 is applied into the region 50 of the regenerated paper 30, the color development of a color different from a color before the application of heat is generated in the region 50 in the memory regenerated paper 30. The operation is repeated, thus printing information 60 on the regenerated paper 30. An electric signal 70 corresponding to information 60 is input to the memory 21 from a terminal 80 at the same time, and information 60 is stored in the memory 21 in the memory unit 20. When the whole regenerated paper 30 is irradiated with beams 41, the color-developed section of regenerated paper 30 is returned to an original color, thus erasing information 60. The electric signal 71 of erasing indication is input simultaneously from the terminal 80, and the information 60 of the memory 21 in the memory unit 20 is erased.

46. 发明专利

JPH0376027A METHOD AND DEVICE FOR INITIALIZING RECORDING MEDIUM 失效
公开(公告)号：JPH0376027A
公开(公告)日：1991-04-02
申请号：JP21130589
申请日：1989-08-18
申请人： HITACHI LTD
发明人： MIYAUCHI YASUSHI , TERAO MOTOYASU , ANDO KEIKICHI
IPC分类号： G11B7/26 , G11B7/00 , G11B7/0055 , G11B7/30
摘要： PURPOSE:To obtain good recording characteristics over the entire area of a recording film by using plural laser beam spots. CONSTITUTION:Irradiation is executed by using a semiconductor laser array or splitting a gaseous laser beam to a plurality in an initializing method. The irradiation is, therefore, executed several times at the same place by one rotation of a disk. The respective light spots 8, 9 may be arrayed on the same track or the irradiation of >=2 tracks 8' or between the track 8' and the track 9' with these spots is more preferable. The irradiation is so executed that the recording regions are initialized if there are no tracking guides. The recording characteristics good over the entire area of the recording film are obtd. in this way.

47. 发明专利

JPH0363178A DATA RECORDING MEMBRANE AND DATA RECORDING AND REPRODUCING METHOD 失效
公开(公告)号：JPH0363178A
公开(公告)日：1991-03-19
申请号：JP19944189
申请日：1989-08-02
申请人： HITACHI LTD , HITACHI MAXELL
发明人： TAMURA AYAHITO , TERAO MOTOYASU , MIYAUCHI YASUSHI , ANDO KEIKICHI , NISHIDA TETSUYA
IPC分类号： B41M5/26 , G11B7/24 , G11B7/243
摘要： PURPOSE:To improve recording and reproducing characteristics, to enhance sensitivity and to improve stability by forming a data recording membrane so as to have an average composition represented by general formula SbxTeyMAzMBpMCqMDr in the thickness direction thereof. CONSTITUTION:A data recording membrane has an average composition represented by general formula SbxTeyMAzMBpMCqMDr in the thickness direction thereof. In the general formula, x, y, z, p, q and r are atomic % and values within ranges in an attached table I, MA is Sn, Bi or Pb, MB is Tl, a halogen element such as I or alkali metal such as Na, MC is Ag, Cu or Pd, Md is Sb, Te or at least one element among elements other than elements represented by MA, MB and MC. By this method, an amorphous state is stably held and crystallization at the time of recording/erasure can be performed at a high speed.

48. 发明专利

JPH02158383A DATA RECORDING MEMBRANE 失效
公开(公告)号：JPH02158383A
公开(公告)日：1990-06-18
申请号：JP31201688
申请日：1988-12-12
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAUCHI YASUSHI , TERAO MOTOYASU , NISHIDA TETSUYA , ANDO KEIKICHI , TAMURA NORIKIMI
IPC分类号： B41M5/26 , G11B7/243
摘要： PURPOSE:To form the title membrane having good recording/reproduction characteristics and high sensitivity and enhanced in stability by allowing Ge, Te and other elements to coexist in a specific ratio not only to stably hold an amorphous state but also to increase a crystallization speed at the time of recording/erasure. CONSTITUTION:The average composition of a data recording membrane in the thickness direction thereof is represented by formula, wherein x, y, z, alpha, betaand gamma are respectively 0

49. 发明专利

JPH02151482A DATA RECORDING MEMBRANE 失效
公开(公告)号：JPH02151482A
公开(公告)日：1990-06-11
申请号：JP30605588
申请日：1988-12-05
申请人： HITACHI LTD , HITACHI MAXELL
发明人： MIYAUCHI YASUSHI , TERAO MOTOYASU , ANDO KEIKICHI , NISHIDA TETSUYA , TAMURA REIJI
IPC分类号： B41M5/26 , G11B7/243
摘要： PURPOSE:To obtain a data recording membrane having good recording/ reproduction characteristics and good stability by setting the average composition of the data recording membrane in the membrane thickness direction to a composition represented by a specific formula. CONSTITUTION:A data recording membrane whose average composition in the membrane direction thereof is represented by formula I nxAuyAzBalphaCbetaDgamma (wherein x, y, z, alpha, beta and gamma have values of 12

50. 发明专利

JPH02134728A METHOD AND APPARATUS FOR INFORMATION RECORDING AND READOUT 失效
公开(公告)号：JPH02134728A
公开(公告)日：1990-05-23
申请号：JP28767188
申请日：1988-11-16
申请人： HITACHI LTD
发明人： MURASE CHIKAO , TERAO MOTOYASU
IPC分类号： G11B7/0045 , B41M5/26 , G11B7/00 , G11B7/004
摘要： PURPOSE:To improve the write energy efficiency by radiating lights of two wavelengths of 1mum or below and 2.8mum or over simultaneously onto the same location of a recording medium. CONSTITUTION:Molecules in charge on the recording are transited to the electron stimulating state by the radiation of light whose wavelength is 1mum or below. The wavelength of 1mum or below is selected because the electrons of organic molecules require a minimum energy corresponding to the wavelength of 1mum or below for the stimulation of them. However, the probability of the reaction causing the hole burning is very less in such a state. When the light having the wavelength of 2.8mum or over is radiated to the recording medium as soon as the state above is transited, the electrons are transited to the state of the stimulating state with a high energy. In this state, the probability of the electrons on the way of the reaction passing through the potential barrier is increased. Thus, highly efficient write is attained.

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