JPS6453788A - Laser beam cutting method for digital disk - Google Patents

Laser beam cutting method for digital disk

Info

Publication number
JPS6453788A
JPS6453788A JP62207103A JP20710387A JPS6453788A JP S6453788 A JPS6453788 A JP S6453788A JP 62207103 A JP62207103 A JP 62207103A JP 20710387 A JP20710387 A JP 20710387A JP S6453788 A JPS6453788 A JP S6453788A
Authority
JP
Japan
Prior art keywords
pit lines
cut
pit
base plate
central point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62207103A
Other languages
Japanese (ja)
Other versions
JPH0454302B2 (en
Inventor
Yoshihiro Aramata
Yasunobu Edahiro
Toshinori Mikami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seidensha Electronics Co Ltd
Original Assignee
Seidensha Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seidensha Electronics Co Ltd filed Critical Seidensha Electronics Co Ltd
Priority to JP62207103A priority Critical patent/JPS6453788A/en
Publication of JPS6453788A publication Critical patent/JPS6453788A/en
Publication of JPH0454302B2 publication Critical patent/JPH0454302B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers

Abstract

PURPOSE:To cut the central hole and the outside periphery with high accuracy under noncontact state by detecting pit lines of a base plate wherein digital information is recorded and calculating the central point of an eddy of the pit lines to cut the central hole and the outside periphery situated at the prescribed distance from the central point by a laser beam. CONSTITUTION:The plural spiral pit lines 2 up to the outermost peripheral pit lines 4 from the innermost peripheral pit lines 3 are formed in the longitudinal direction of the base plate 1 on the polycarbonate slender tabular base plate 1. Next, a part covered by a reflection film 6 is cut off from the base plate 1 and set on a rotary base 7. Next, after the center of graduations of a microscope 10 is fitted to one pit of the innermost peripheral pit lines 3, the deviation of the innermost peripheral pits 3 at each position of 90 deg., 180 deg. and 270 deg. of the rotary base 7 is measured. Then, the base plate 1 is moved in the direction in opposition to the deviation and the central point of the pit lines 2 is coincident with a rotation axis of the rotary base 7. Next, the position separated by the distance from the central point of the pit lines 2 to the determined inside periphery is cut by the laser beam 12a. Next, the position separated by the distance from the central point of the pit lines 2 to the determined outside periphery is cut in the same way.
JP62207103A 1987-08-20 1987-08-20 Laser beam cutting method for digital disk Granted JPS6453788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62207103A JPS6453788A (en) 1987-08-20 1987-08-20 Laser beam cutting method for digital disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62207103A JPS6453788A (en) 1987-08-20 1987-08-20 Laser beam cutting method for digital disk

Publications (2)

Publication Number Publication Date
JPS6453788A true JPS6453788A (en) 1989-03-01
JPH0454302B2 JPH0454302B2 (en) 1992-08-31

Family

ID=16534250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62207103A Granted JPS6453788A (en) 1987-08-20 1987-08-20 Laser beam cutting method for digital disk

Country Status (1)

Country Link
JP (1) JPS6453788A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03203836A (en) * 1989-12-30 1991-09-05 Taiyo Yuden Co Ltd Production of optical information recording medium
JPH03275290A (en) * 1990-03-23 1991-12-05 Canon Inc Optical cutting machine
WO1995021444A1 (en) * 1994-02-02 1995-08-10 Warner Music Manufacturing Europe Gmbh Process for cutting central holes in cd's
WO1997049537A1 (en) * 1996-06-27 1997-12-31 Krauss-Maffei Ag Method of removing the sprue from an injection moulding
JP2005508760A (en) * 2001-11-15 2005-04-07 レニショウ　パブリック　リミテッド　カンパニー Substrate processing apparatus and method, and encoder scale machined by this method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103038827A (en) 2011-05-10 2013-04-10 松下电器产业株式会社 Information recording medium and holding device for holding information recording medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03203836A (en) * 1989-12-30 1991-09-05 Taiyo Yuden Co Ltd Production of optical information recording medium
JPH03275290A (en) * 1990-03-23 1991-12-05 Canon Inc Optical cutting machine
WO1995021444A1 (en) * 1994-02-02 1995-08-10 Warner Music Manufacturing Europe Gmbh Process for cutting central holes in cd's
WO1997049537A1 (en) * 1996-06-27 1997-12-31 Krauss-Maffei Ag Method of removing the sprue from an injection moulding
JP2005508760A (en) * 2001-11-15 2005-04-07 レニショウ　パブリック　リミテッド　カンパニー Substrate processing apparatus and method, and encoder scale machined by this method
JP4813018B2 (en) * 2001-11-15 2011-11-09 レニショウ パブリック リミテッド カンパニー Substrate processing apparatus and method, and encoder scale machined by this method

Also Published As

Publication number Publication date
JPH0454302B2 (en) 1992-08-31

Similar Documents

Publication Publication Date Title
EP0284387A2 (en) Master disk
EP0070514B2 (en) A method for manufacturing an information memory disk
EP0657884A1 (en) Magnetic recording medium, method of producing it, and magnetic recording apparatus using it
JPS6459651A (en) Recording element including one writing amorphous thin film optical recording layer
MY100768A (en) Magnetic disc apparatus.
JPS6453788A (en) Laser beam cutting method for digital disk
JP2001336926A (en) Method for detecting deviation of disc center
EP0613578B1 (en) System for thermal calibration of hard disk drive
EP0372953A3 (en) Method of, and apparatus for detecting access speed for a disc player
US9953806B1 (en) Substrate alignment detection using circumferentially extending timing pattern
JPS5332637A (en) Hologram memory, its manufacture, and reproducing method for information
JPH0843130A (en) Method and apparatus for detecting rotational information
SE523284C2 (en) Method and apparatus for quality testing
JPS57103136A (en) Optical disk and optical disk device
JPS5622227A (en) Information recording system of optical disk
US3481609A (en) High precision record player
WO1993009536A1 (en) Method for measuring quantity of displacement
US5642289A (en) Drum lead measuring method and apparatus capable of precisely evaluating lead shape
JPS57103134A (en) Optical disk
JPH06259816A (en) Method for measuring thickness of stamper
JP2816213B2 (en) Magnetic recording / reproducing method of information
JPS6224117A (en) Light beam waste measurement
JPS5774846A (en) Information storing medium
CN117798741A (en) Double-station turret positioning detection system of machine tool
JPS63249937A (en) Optical disk