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Title:
METHOD AND APPARATUS FOR PRODUCING OPTICAL DISC
Document Type and Number:
Japanese Patent JPH08124226
Kind Code:
A
Abstract:

PURPOSE: To simplify the cutting process by irradiating an optical disc with continuously oscillating laser light subjected to intensity modulation and forming a signal groove therein thereby eliminating the step for applying photoresist and the step for development.

CONSTITUTION: A single mode continuous oscillation laser light is fed from a UV laser light source 1 through a mirror 2 to an acoustooptical modulation element 3 where the laser light is subjected to intensity modulation with a signal fed from a formatter 4 and outputted as an optical modulation pulse. It is fed through a mirror 5 to a beam expander 6 where the beam diameter is enlarged and the beam passes through mirrors 7, 8 and impinges on the incident pupil face of an objective lens 9 before being condensed onto an original optical disc 13 with a spot size of diffraction limit by adjusting the focus. An optical system including a lens 9 is then shifted from the outer circumference to the center in order to expose the original disc 13 spirally thus recording signals through abrasion.


Inventors:
AKI YUICHI
TAKEDA MINORU
Application Number:
JP26380694A
Publication Date:
May 17, 1996
Filing Date:
October 27, 1994
Export Citation:
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Assignee:
SONY CORP
International Classes:
G11B7/00; G11B7/0045; G11B7/26; (IPC1-7): G11B7/26; G11B7/00
Attorney, Agent or Firm:
Akira Koike (2 outside)