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51. 发明专利

JPH09174617A MOLD FOR MOLDING SUBSTRATE OF OPTICAL RECORDING MEDIUM AND MOLDING MACHINE 失效
公开(公告)号：JPH09174617A
公开(公告)日：1997-07-08
申请号：JP35134795
申请日：1995-12-26
申请人： HITACHI MAXELL , HITACHI LTD
发明人： FUJIKAWA KAZUHIRO , ONUKI SATORU , OTA NORIO , YOSHII MASAKI , KURAMOTO HIROKI
IPC分类号： B29C45/26 , B29C45/56 , B29L31/00 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To manufacture an optical disc substrate which has no sink mark in inside peripheral thick part and less double refraction when a thin optical disk substrate where the plate thickness of the inside peripheral part is larger than that of an information recording area, by an injection molding method. SOLUTION: A mold 1 is composed of a fixed die la and a moving die 1b, a recess 31 is formed on the compressed surface of the moving die 1b so that the substrate of an optical recording medium where the plate thickness of the inside perimeter is larger than that of an information recording area and the plate thickness of the information recording area is constant may be molded from a resin material. Within the moving die 1b, there are a piston 8 and cylinder 9 which compress only a resin material part forming the inside perimeter from the information recording area of the substrate.

52. 发明专利

JPH07272324A OPTICAL DISK 失效
公开(公告)号：JPH07272324A
公开(公告)日：1995-10-20
申请号：JP6475694
申请日：1994-04-01
申请人： HITACHI LTD
发明人： KURAMOTO HIROKI , YOSHII MASAKI , EBINUMA NAOTAKE
IPC分类号： G11B7/24 , G11B7/007
摘要： PURPOSE:To obtain an optical disk which improves transferability with easy constitution and improves signal characteristics by molding a replica substrate by such a stamper that forms signal marks of a prescribed track pitch, etc., to a projecting shape. CONSTITUTION:This optical disk 1 is constituted of the single replica substrate 2 or by sticking these substrates. The signal marks 4 which are information pits are formed by means of the stamper on the information region 3 of the substrate 2. The marks 4 are formed to the projecting shape and the track pitch P is

53. 发明专利

JPH0647787A METHOD FOR FORMING OPTICAL DISC SUBSTRATE AND OPTICAL DISC SUBSTRATE 失效
公开(公告)号：JPH0647787A
公开(公告)日：1994-02-22
申请号：JP20214392
申请日：1992-07-29
申请人： HITACHI LTD
发明人： KURAMOTO HIROKI , YOSHII MASAKI , EBINUMA NAOTAKE
IPC分类号： B29C45/77 , B29C45/78 , B29L17/00 , G11B7/24 , G11B7/26 , G11B11/10 , G11B11/105
摘要： PURPOSE:To obtain an optical disc substrate which shows satisfactory group or pit transfer properties. CONSTITUTION:A molding resin is completely filled within 0.35sec., and at the same time, the non-dimensional temperature THETA-(Tg-Tmo)/(Tme-Tmo) which is determined by a molding resin glass transition temperature Tg, and a die temperature Tmo and a resin temperature Tme during injection molding, should be 0.02

54. 发明专利

JPH03176115A INJECTION MOLDING MACHINE 失效
公开(公告)号：JPH03176115A
公开(公告)日：1991-07-31
申请号：JP31530589
申请日：1989-12-06
申请人： HITACHI LTD , TOYO MACHINERY & METAL
发明人： KURAMOTO HIROKI , YOSHII MASAKI , SUGA NORIHIKO , TSUCHIYA SEIICHI
IPC分类号： B29C45/43 , B29C45/76
摘要： PURPOSE:To reduce a deformation to be generated at the time of release of a molded product in plastic injection molding, by a method wherein the title machine is provided with an air pressure controlling device controlling air pressure in multistages or continuously. CONSTITUTION:Air is ramified into two directions from an air source 4, estab lished at fixed pressure respectively with pressure control valves 5a, 5b, met through switching valves 6a, 6b and fed to an air blow-off hole 3 through a switching valve 7. A control device 9 is provided with a timer device, controls the switching valve 7 according to the sequence of a molding cycle to a molded product 8 and changeover control of air pressure is performed by controlling start and stop in feeding of the air and the switching valves 6a, 6b. The title machine is constituted so that mold release is started calmly by applying low air pressure to the title machine at the beginning to control a deformation of the plastic molded product 8 and then the air pressure is increased. Then a control device 9 is provided with a memory, contents of the memory are read out according to the sequence of the molding cycle, changeover timing is established to each of the switching valves 6a, 6b, 7 and pressure of each of the pressure control valves 5a, 5b is established.

55. 发明专利

JPH01306214A OPTICAL DISK BASE AND ITS MOLDING DIE 失效
公开(公告)号：JPH01306214A
公开(公告)日：1989-12-11
申请号：JP13548588
申请日：1988-06-03
申请人： HITACHI LTD
发明人： AMANO YASUO , YOSHII MASAKI , KURAMOTO HIROKI , TAKASU KEIJI
IPC分类号： B29C45/36 , B29C45/26 , B29C45/37 , B29L17/00 , G11B7/24 , G11B7/26
摘要： PURPOSE:To increase transferability of an information pit shape of a stamper and enhance reading capability by forming a mirror surface in the shape of recessed or projecting sections in an aread facing an area of the information surface except an information storage area. CONSTITUTION:An optical disk base 21 is provided with an information surface 20 forming an information pit 20a in an information storage area 22, while a mirror surface 19 forming an undercut shape recessed section 18 in the circumferential shape in an area facing an area 23 except the information storage area 22 of the information surface 20. The outer disk peripheral surface is formed into a conical surface shaped disk outer peripheral surface 17 with a diameter of the information surface side 20 smaller than that of the mirror surface 19 side. As the shape of an information bit 20a of the optical disk base 21 thus constituted extremely accurately, the same stores the information accurately and reading capability of the information pit 20a is superior. At that time, an undercut shaped recessed section 18 should never be in an optical path of laser rays.

56. 发明专利

JPH01241408A RESIN MOLDING APPARATUS 失效
公开(公告)号：JPH01241408A
公开(公告)日：1989-09-26
申请号：JP6808488
申请日：1988-03-24
申请人： HITACHI LTD
发明人： SASAKI SHIGERU , YOSHII MASAKI , KURAMOTO HIROKI
IPC分类号： B29C33/04 , B29C45/17 , B29C45/73 , B29C45/78 , B29L17/00
摘要： PURPOSE:To prevent the lowering of a die temperature during opening die and enable the stably continuous molding to be performed by equipping a heating medium spraying controlling apparatus which acts to spray the heat medium of a specific temperature to the die surface under the die opening state. CONSTITUTION:When the operation is initiated, a clamping device is operated to a die opening direction and come to a die opening state. The signal detecting the die opening state from a limit switch is inputted into a controlling apparatus 14, compressed air 7 is introduced into an air conduit 5 and the air is heated passing through the air conduit 5 and comes up to the set temperature, further, the compressed high temperature air 2 is spouted to a die surface 10 from a spouting port 8. The temperature of the die surface 10 detected by a temperature detector 9 is inputted into the controlling apparatus 14, and the temperature of the spouting compressed high temperature air 2 is controlled through the ON-OFF operation of a heat source, so that the temperature of the die surface 10 is kept at a predetermined temperature. The arm of a remover is inserted between the dies, resin molding article is removed and die-clamped. Since the temperature of the surface 10 is always held constant in spraying the compressed high temperature air 2, the temperature lowering or the inhomogenation in temperature distribution of the die opposite surface during opening die is prevented, thus a stably continuous molding can be done.

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