Title:
OPTICAL RECORDING MEDIUM MASTER EXPOSURE DEVICE AND OPTICAL RECORDING MEDIUM MASTER EXPOSURE METHOD
Document Type and Number:
WIPO Patent Application WO/2004/036565
Kind Code:
A1
Abstract:
An optical recording medium master exposure device includes: modulation means (3) for light-intensity-modulating light from an exposure light source (1) according to the recording information; and a collection optical system (9) for collecting the light modulated by the modulation means (3) onto a photo-resist (12) on an optical recording medium master (11). The photo-resist (12) is subjected to pattern exposure according to the recording information. The exposure light source (1) emits an ultra-short pulse laser of repetitive frequency which is a recording information clock frequency multiplied by an integer of 1 to 20. This ultra-short pulse laser oscillator length can be modified. The repetitive frequency of the ultra-short pulse laser is mode-locked in synchronization with the clock frequency. An external synchronization mechanism is provided for pulse oscillation. Thus, it is possible to form a very small pit with a high accuracy.
Inventors:
TAMADA SAKUYA (JP)
Application Number:
PCT/JP2003/013130
Publication Date:
April 29, 2004
Filing Date:
October 14, 2003
Export Citation:
Assignee:
SONY CORP (JP)
TAMADA SAKUYA (JP)
TAMADA SAKUYA (JP)
International Classes:
G11B7/125; G11B7/126; G11B7/1378; G11B7/1398; G11B7/26; (IPC1-7): G11B7/125; G11B7/135; G11B7/26
Foreign References:
| JP2000033487A | 2000-02-02 | |||
| JPH0798891A | 1995-04-11 | |||
| JP2000033487A | 2000-02-02 | |||
| US6285002B1 | 2001-09-04 |
Other References:
TOKYO, JP, SOCIETY OF APPLIED PHYSICS, vol. 38, no. 3B, 1 March 1999 (1999-03-01), pages 1837
See also references of EP 1553573A4
See also references of EP 1553573A4
Attorney, Agent or Firm:
Tsunoda, Yoshisue (8-1 Nishishinjuku 1-chom, Shinjuku-ku Tokyo, JP)
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