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41. 发明专利

JP2002216389A OPTICAL RECORDING DISK 失效
公开(公告)号：JP2002216389A
公开(公告)日：2002-08-02
申请号：JP2001012289
申请日：2001-01-19
申请人： TDK CORP
发明人： TAKAHATA HIROAKI , KOYAKE HISASHI
IPC分类号： G11B7/24 , G11B7/007
摘要： PROBLEM TO BE SOLVED: To sufficiently heighten pre-pit reproducing signal strength and tracking signal strength in a group area in an optical recording disk having a pre-pit area and the group area. SOLUTION: This optical recording disk has the group area AG and the pit area AP. In this case, the pit area AP includes a signal pit area ASP which holds recording information and a pit area ATP for tracking which does not hold the recording information, the pit area ATP for tracking is between the group area AG and the signal pit area ASP, the group, the pit for tracking and the signal pit are serially and spirally arranged, the group and the pit for tracking each have a V-shaped section, and the correlation among the depth DG of the group, the depth DTP of the pit for tracking and the depth DSP of the signal pit satisfies an inequality DG

42. 发明专利

JP2002050086A EXPOSURE DEVICE 失效
公开(公告)号：JP2002050086A
公开(公告)日：2002-02-15
申请号：JP2000235933
申请日：2000-08-03
申请人： TDK CORP
发明人： KOYAKE HISASHI , TAKAHATA HIROAKI
IPC分类号： G03F7/20 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To enhance the write-in accuracy of exposure with a simple configuration. SOLUTION: The exposure device 10 has a turntable 14 to suck and support a glass substrate 12, a laser beam irradiating mechanism to irradiate the exposure region S of the glass substrate 12 with a laser beam for write, and a focal point controller to control the focal point of the laser beam irradiating mechanism by irradiating the glass substrate 12 with a laser beam for control and detecting the quantity of reflected light. The quantity of light reflected on the upper surface of the turntable of the laser beam for control is prevented from being fluctuated by a negative pressure introducing hole 50, by forming the negative pressure introducing hole 50 in a position corresponding to the non-exposing region H of the glass substrate 12 in the upper surface 14A of the turntable 14 so as to apply a negative pressure on the undersurface 12A side of the glass substrate 12.

43. 发明专利

JP2001319379A OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JP2001319379A
公开(公告)日：2001-11-16
申请号：JP2000138683
申请日：2000-05-11
申请人： TDK CORP
发明人： TAKAHATA HIROAKI , KOYAKE HISASHI
IPC分类号： G11B7/24 , G11B7/007 , G11B7/013 , G11B7/26
摘要： PROBLEM TO BE SOLVED: To provide an optical recording medium in which a groove is used as a recording track, a pre-pit is arranged between the adjacent grooves and the increase of errors accompanied by high-density recording is restrained while the raise of the manufacturing cost is kept to a minimum. SOLUTION: This optical recording medium has a recording layer on the surface of a substrate, grooves exist almost parallel to each other on the recording layer-formed side while sandwich a land and a pre-pit on the land. When the height, which is measured from the bottom face of the groove, of the land between the pre-pit and the groove is defined as HP and that, which is measured from the bottom face of the groove, of the land in the region where the pre-pit is absent is defined as HL, 0.25

44. 发明专利

JPH04311835A PRODUCTION OF OPTICAL MASTER DISK 失效
公开(公告)号：JPH04311835A
公开(公告)日：1992-11-04
申请号：JP10472591
申请日：1991-04-10
申请人： TDK CORP
发明人： TAKAHATA HIROAKI , NAKAYAMA YOICHI , KOYAKE HISASHI
IPC分类号： G11B7/125 , G11B7/26
摘要： PURPOSE:To improve groove shapes at the time of preformatting the optical master disk by forming grooves wider than pits together with the pits on the photoresist film of the optical master disk. CONSTITUTION:A recording beam is passed through 1st and 2nd acoustooptical elements 1, 2. The arrays of the pits are formed when the beam is modulated by the 1st acoustooptical element 1 and is passed through the 2nd acoustooptical element 2. The beam past the 1st acoustooptical element is made incident on the 2nd acoustooptical element and the photoresist film is irradiated with the transmitted light, zero order light and 1st order light of the recording beam generated by subjecting the 2nd acoustooptical element 2 to on/off driving at the frequency period larger than 5MHz by parting the beams while overlapping the beams in the circumferential and diametral directions of the beam, by which the grooves broader than the beam spot are formed.

45. 发明专利

JPH04311834A PRODUCTION OF GROOVE OF OPTICAL MASTER DISK 失效
公开(公告)号：JPH04311834A
公开(公告)日：1992-11-04
申请号：JP10472491
申请日：1991-04-10
申请人： TDK CORP
发明人： TAKAHATA HIROAKI , NAKAYAMA YOICHI , KOYAKE HISASHI
IPC分类号： G11B7/00 , G11B7/0045 , G11B7/26
摘要： PURPOSE:To form grooves for tracking of the width uniform over the entire circumference of a disk at the time of forming the grooves on the photoresist film of an optical master disk by irradiating the film with a laser beam. CONSTITUTION:The photoresist film on the optical master disk is irradiated with the laser beam under the conditions of Pi/Vi=k(Po/Vo) k=1-cx(V0/Vi), 0.01

46. 发明专利

JPH0214110A MANUFACTURE OF CASSETTE 失效
公开(公告)号：JPH0214110A
公开(公告)日：1990-01-18
申请号：JP16264888
申请日：1988-07-01
申请人： TDK CORP
发明人： SHIBA HARUO , ISHIDA TOSHIHIKO , TANAKA KIMIO , NAKAYAMA YOICHI , ARIOKA HIROYUKI , TAKAHATA HIROAKI
IPC分类号： B29C33/38 , B29C33/42 , B29C45/37 , B29L31/34 , G11B23/38
摘要： PURPOSE:To make it possible to display quality guarantee and other indications and enhance the degree of freedom and aesthetic feeling by transferring and duplicating diffraction gratings on the surface of a synthetic material filled in a cavity by means of a stamper forming a diffraction gratings and indicating the same in the position to correspond with a visual section of a cassette. CONSTITUTION:Images constituted of patterns, shapes and other diagrams are data-processed by means of digital signals on a X and Y coordinate system in a case inner structure corresponding with a case visual section 3 and input and stored in a ROM writer. Data in said ROM writer is output by means of rotary synchronous pulses of a turntable on which a glass base with a photoresist film, and the photoresist film is laser cut corresponding with ON- OFF of the laser to form diffraction gratings. After that, phenomenon and surface conductive processing is carried out to manufacture a stamper transfer forming diffraction gratings and a synthetic resin material is filled in the cavity in which said stamper is placed, and a case inner structure corresponding with the case visual section is formed in the duplicating process to form diffraction gratings on the surface.

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