METHOD FOR MANUFACTURING OPTICAL DISK MASTER DISK, OPTICAL DISK MASTER DISK, OPTICAL DISK AND OPTICAL DISK MASTER DISK EXPOSURE DEVICE

Title:

METHOD FOR MANUFACTURING OPTICAL DISK MASTER DISK, OPTICAL DISK MASTER DISK, OPTICAL DISK AND OPTICAL DISK MASTER DISK EXPOSURE DEVICE

Document Type and Number:

Japanese Patent JP2002150621

Kind Code:

A

Abstract:

To manufacture an optical disk master disk in which the pit width is reduced while keeping a proper asymmetry value by adding a concave pulse to a recording signal when forming a pit having a prescribed length.

A recording signal generating part 30 generates a recording signal in which the relation between the voltage Vp of the rising and falling of a pulse and at least a part of middle voltage Vm is made into Vm<Vp. A modulation part 9 modulates recording light by using the recording signal generated by the recording signal generating part 30. A glass master disk on which a photoresist is applied is irradiated with recording light. In addition, the relation of Vm<Vp is attained provided that the spot diameter w of the recording light used for the pattern exposure of a pit sequence is in the relation of w≥0.65 r with respect to the spot diameter r of reproducing light.

Inventors:

MASUHARA SHIN
ISHIMOTO TSUTOMU
KOBAYASHI SHOEI
KATSURAMOTO SHINJI
UEMURA KAMON

Application Number:

JP2000344492A

Publication Date:

May 24, 2002

Filing Date:

November 10, 2000

Export Citation:

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Assignee:

SONY CORP

International Classes:

G11B7/0045; G11B7/24035; G11B7/24079; G11B7/24085; G11B7/26; (IPC1-7): G11B7/26; G11B7/0045; G11B7/24

Domestic Patent References:

JPH05234146A	1993-09-10
JPS63153743A	1988-06-27

Attorney, Agent or Firm:

Akira Koike (2 outside)

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