Multi-focusing laser beam recorder and multi-focusing method the

Details Multi-focusing laser beam recorder and multi-focusing method the Multi-focusing laser beam recorder and multi-focusing method the

1997-12-24

2000-05-23

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347241, 369 4411, 369 4414, 369 4426, G11B 700

Patent

active

06067105&

ABSTRACT:
A multi-focusing laser beam recorder and a multi-focusing method includes first and second light sources for generating a Kr laser beam for recording light and an He--Ne laser beam for focusing. A fixed optical system modulates the Kr laser beam for recording light and divides the beam into a main beam and a sub beam on each of different paths. An optical divider divides the main beam or the sub beam incident through a shutter of the fixed optical system and the He--Ne laser beam incident from the second light source. A focus servo focuses either the main beam or the sub beam from the optical divider and the He--Ne laser beam on a predetermined area of the glass substrate. First, second and third position sensor controllers control the focus servo to focus the He--Ne laser beam on the glass substrate in response to the pit width of the glass substrate by sensing the laser beam for focusing reflected upon the glass substrate. In such a multi-focusing laser beam recorder, it is possible to reduce required time and price related to process steps and to enable using the position sensors to cut any pit.

REFERENCES:
patent: 5195081 (1993-03-01), Usui
patent: 5295125 (1994-03-01), Oonishi et al.
patent: 5623464 (1997-04-01), Tani
patent: 5828636 (1998-10-01), Matsumoto et al.

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