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21. 发明专利

JPH01224940A REWRITABLE TYPE PHASE CHANGE RECORDING MEDIUM 失效
公开(公告)号：JPH01224940A
公开(公告)日：1989-09-07
申请号：JP5125888
申请日：1988-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： CHIBA REIICHI , FUNAKOSHI NORIHIRO , FUJIMORI SUSUMU , SUGIYAMA YASUYUKI
IPC分类号： B41M5/26 , G11B7/24 , G11B7/243
摘要： PURPOSE:To provide the higher stability by room temp. to enable the faster crystallization at the time of erasing without impairing the initial characteristics in spite of repetitive writing and erasing by using Sb and Zn as essential components and specifying the compsn. ratios to the compsn. ratios between SbZn and Sb2Zn3. CONSTITUTION:This recording medium has a transparent substrate 1, a record ing layer 2, a transparent protective layer 3, and a transparent underlayer 4. The optical recording layer 2 consists essentially of the Sb and Zn and is so formed that the compsn. ratios thereof are approximate to the compsn. ratios of the SbZn-Sb2Zn3. Since the chemical stability is thereby maintained in spite of the execution of the repetitive writing and erasing, the initial medium characteristics are maintained without generating a large compsn. deviation and the similar characteristics are obtd. even if the compsn. ratios are in the relatively wide range of about + or -5at.% from the compsn. ratios of the SbZn-Sb2 Zn3 (i.e., Sb:Zn=50:50-40:60). The amorphous stability at room temp. is thus improved and the erasing speed is increased.

22. 发明专利

JPH01220147A INFORMATION RECORDING MEDIUM 失效
公开(公告)号：JPH01220147A
公开(公告)日：1989-09-01
申请号：JP4236888
申请日：1988-02-26
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJI PHOTO FILM CO LTD
发明人： FUJIMORI SUSUMU , YAMAZAKI HIRONORI , FUNAKOSHI NORIHIRO , SAWANO MITSURU , IGATA TOSHIAKI , TAKAHASHI YONOSUKE
IPC分类号： B41M5/26 , C03C17/06 , G11B7/24 , G11B7/243
摘要： PURPOSE:To obtain the medium which allows easy writing and has high reading accuracy and erasing efficiency by incorporating Sn of a specific range into an Sb-Te alloy forming a recording layer. CONSTITUTION:The Sn of the 0.1-20atom.% range is incorporated into the Sb-Te alloy forming the recording layer. The writing with the small laser power is thereby enabled. Further, the speed and contrast of the transition of the amorphous state and the crystal state are large and, therefore, the medium having the high reading speed and erasing efficiency is obtd. The preservable property of information is further improved if the content of the Sn is in a 0.5-6.0atom.% range and the ratio of the Sb and Te is in a 8:32-12:88 or 61:39-52:48 range by number of atoms.

23. 发明专利

JPH01213842A REWRITING TYPE OPTICAL DISK MEDIUM 失效
公开(公告)号：JPH01213842A
公开(公告)日：1989-08-28
申请号：JP3859488
申请日：1988-02-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： CHIBA REIICHI , MIYAGI MASAMI , FUJIMORI SUSUMU , SUGIYAMA YASUYUKI
IPC分类号： G11B7/24 , G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain a rewriting type optical disk medium, which can prevent thermal interference between respective tracks, by specifying the depth of a group, which is formed on a transparent substrate, and the shape of a group side surface. CONSTITUTION:A plastic substrate 4, to which a group 1 and a bob-ring mark 3 are attached, is manufactured by mastering to user a laser light. In the plastic substrate 4 to be obtained in such a way, the depth of the group 1 can be made deep in comparison with the total film thickness of a formed medium. Simultaneously, since the side surface of the group 1 stands up, when a protecting layer 5 and a recording layer 6 are accumulated on this side surface by the vacuum evaporation method of satisfactory directivity, etc., the medium film thickness goes to be extremely thin in the side surface of the group 1 in comparison with the upper part of a land 2. Thus, an interval between the respective lands 2 is thermally insulated. Accordingly, the thermal interference between the respective tracks is prevented.

24. 发明专利

JPH01130343A OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH01130343A
公开(公告)日：1989-05-23
申请号：JP28741087
申请日：1987-11-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： CHIBA REIICHI , FUNAKOSHI NORIHIRO , FUJIMORI SUSUMU , SUGIYAMA YASUYUKI
IPC分类号： B41M5/26 , G11B7/24
摘要： PURPOSE:To shorten the time for erasing by laser light by providing a heat inertia layer which attains a crystal state and has the m.p. near the m.p. of an optical recording layer in proximity to the optical recording layer. CONSTITUTION:The heat inertia layer 4 which attains the crystal state and has the m.p. near the m.p. of the optical recording layer 2 is provided in proximity to the optical recording layer 2. Namely, the non-irradiated part of the heat inertia layer 4 melts when said layer is irradiated with the erasing laser beam. Latent heat is absorbed and released in the heat inertia layer 4 according to such melting. The temp. rise and fall of the waste heat layer 4 do not take place during this time and, therefore, the temp. rise and fall of the optical recording layer 2 change more gently. The temp. gradient of the optical recording layer 2 is gentle near the m.p. temp. of the heat inertia layer 4 when the heat inertia layer 4 is provided. The area of the temp. convenient for crystallization is thereby increased even if the beam of the same profile is used. The crystallization of amorphous recording marks is thus facilitated.

25. 发明专利

JPH0192937A ERASING TYPE OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH0192937A
公开(公告)日：1989-04-12
申请号：JP24779187
申请日：1987-10-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： CHIBA REIICHI , FUNAKOSHI NORIHIRO , FUJIMORI SUSUMU , SUGIYAMA YASUYUKI
IPC分类号： B41M5/26 , G11B7/24 , G11B7/243
摘要： PURPOSE:To improve the apparent nucleus forming speed frequencies of a recording layer near the m.p. of an optical recording medium so that the top in the increase of the crystallization rate is suppressed by providing a nucleus forming layer adjacently to the recording layer. CONSTITUTION:The recording layer consisting of a thin alloy film having 80nm thickness and Te57In18Au25 compsn. is provided on a transparent substrate 1 consisting of a glass plate having 1.2mm thickness. The nucleus forming layer 3 having 10nm thickness and Te67Au33 compsn. is provided on this recording layer 2. A transparent protective layer 4 consisting of a vapor deposited layer of SiO having 300nm thickness is provided on the nucleus forming layer 3. The frequencies of forming the nuclei near the m.p. of the optical recording medium are thereby improved in the crystallization by laser over heating and the top in the increase of the crystallization rate just below the m.p. is suppressed. The short-period erasing with laser light is thus enabled.

26. 发明专利

JPS6417229A OPTICAL RECORDING MEDIUM AND ITS PRODUCTION 失效
公开(公告)号：JPS6417229A
公开(公告)日：1989-01-20
申请号：JP17128487
申请日：1987-07-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIMORI SUSUMU , FUNAKOSHI NORIHIRO , CHIBA REIICHI , SUGIYAMA YASUYUKI
IPC分类号： G11B7/243 , B41M5/26 , G11B7/24
摘要： PURPOSE:To stabilize a recording state so that a recording medium can be stably operated in spite of repeated recording and erasing by forming the recording medium, the state of which changes with absorption of light or a temp. rise by the absorption of light, in such a manner that at least one of the changing states thereof has an approximately uniform crystal orientation. CONSTITUTION:A recording layer 2 which is subjected to a C-axis orientation by using respective elements of multielement alloys as a composite target is formed in, for example, a sputtering method or electron beam heating method. An amorphous spot 4 is formed when a laser beam is projected to this layer. Crystallization progresses as shown in the lower figure if the laser light is further projected to this part. The process in which the crystallization begins from the crystal part in the periphery and is completed by progressing toward the inner side like arrows A is most liable to arise at this time. The same crystal orientation as in the periphery takes place in the recording layer 2 in this case and, therefore, the orientation is again unified in the C-axis direction. The recording medium which excels in the long-term stability of the recording state and the high-speed erasability as well as the stability of the signal levels in the recording state and erasing state in spite of the repeated recording and erasing is thereby obtd.

27. 发明专利

JPS63270463A METHOD AND DEVICE FOR SPUTTERING 失效
公开(公告)号：JPS63270463A
公开(公告)日：1988-11-08
申请号：JP10376787
申请日：1987-04-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIMORI SUSUMU , FUNAKOSHI NORIHIRO , CHIBA REIICHI
IPC分类号： C23C14/38 , C23C14/40 , G11B7/26 , G11B11/10 , G11B11/105 , H01B3/00 , H01B13/00
摘要： PURPOSE:To improve the quality of a film deposited on the surface of a substrate and to increase the deposition rate by radiating plasma from a target electrode to a substrate electrode at the time of forming the deposited film of the target material on the substrate by the title sputtering device. CONSTITUTION:The N pole of a magnet 3 is arranged on the electrode 1 side on the target side of the sputtering device, and the S pole of the magnet 3 is arranged on the substrate electrode 2 side. consequently, the S pole of the magnet 3 is arranged on the target 5 side, and the N pole of the magnet 3 is arranged on the substrate 6 side. A line of magnetic force 4 is generated from the target 5 toward the substrate 6, a plasma current is generated along the line, the particles sputtered from the target 5 are entrained by the plasma current, and a deposited film is formed on the substrate 6. When the N poles of the magnets are arranged at the central part and outer periphery of the electrode 1 on the target 5 side or conversely the S poles are arranged, the lines 4 of magnetic force repel each other, hence the lines 4 of the magnetic force are generated from the target 5 toward the substrate 6, the particles sputtered from the target 5 are deposited on the substrate 6, and the good- quality film of the target material is rapidly formed.

28. 发明专利

JPS63225933A PHASE CHANGE TYPE OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS63225933A
公开(公告)日：1988-09-20
申请号：JP5878987
申请日：1987-03-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： CHIBA REIICHI , FUNAKOSHI NORIHIRO , FUJIMORI SUSUMU
IPC分类号： G11B7/243 , G11B7/24
摘要： PURPOSE:To stabilize the recording state at room temp. and to perform vanishing operation in a short time of about 1mus by using a multicomponent alloy contg. Sb and Au as principal components and further contg. Se, Te, As, Bi or Zn. CONSTITUTION:When a recording layer 2 is formed on a transparent substrate 1 with a transparent underlayer 4 in-between and a transparent protective layer 3 is formed on the layer 2 to obtain a recording medium, the layer 2 is made of an alloy contg. Sb and Au as principal components and further contg. 2-50atom.% at least one among Se, Bi, As, Te and Zn. In the alloy, the ratio between the number of Sb atoms and that of Au atoms is regulated to 4:1-1:1. Thus, a low noise recording medium is obtd. and vanishing operation can be performed in a short time of about 1mus because mass transfer attendant on phase transition is easily caused by grain refining.

29. 发明专利

JPS62222443A REWRITING TYPE OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS62222443A
公开(公告)日：1987-09-30
申请号：JP6449786
申请日：1986-03-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIMORI SUSUMU , FUNAKOSHI NORIHIRO , CHIBA REIICHI , YAGI IKUTAKE
IPC分类号： G06K19/06 , B41M5/26 , G06K19/00 , G11B7/24 , G11B7/243
摘要： PURPOSE:To obtain an optical recording medium which permits easy writing, reproducing, erasing and particularly high-speed erasing, has high stability of the recording state and permits repetition of writing, reproducing and erasing by forming a recording layer consisting of a specifically composed alloy film and depositing a dielectric protective layer on the top surface and/or bottom surface thereof. CONSTITUTION:The recording layer consisting of the compsn. expressed by the general formula (N1-xSex) is formed on a substrate. In the formula, N is at least one kind of elements among the groups V, IV, and III of periodic table, and 55at.% =2 layers of the thin alloy films sandwiching these layers with the dielectric layers is equally satisfactory.

30. 发明专利

JPS62222442A REWRITING TYPE OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPS62222442A
公开(公告)日：1987-09-30
申请号：JP6449686
申请日：1986-03-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIMORI SUSUMU , FUNAKOSHI NORIHIRO , CHIBA REIICHI , YAGI IKUTAKE
IPC分类号： G06K19/06 , B41M5/26 , G06K19/00 , G11B7/24 , G11B7/243
摘要： PURPOSE:To obtain an optical recording medium which permits easy writing, reproducing, erasing and particularly high-speed erasing, has high stability of the recording state and permits repetition of writing, reproducing and erasing by forming a recording layer consisting of a specifically composed alloy film and depositing a dielectric layer as a protective layer on the top surface and/or bottom surface thereof. CONSTITUTION:The recording layer consisting of the compsn. expressed by the general formula (N1-xTex) is formed on a substrate. In the formula, N is at least one kind of elements among the groups V, IV, and III elements of periodic table, and (x) is 55at.% =2 layers of the alloy layer films and sandwiching these layers with the dielectric layers is equally satisfactory.

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