Laser beam scanner

Details Laser beam scanner Laser beam scanner

1993-05-12

1994-04-12

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359221, 359845, 21912113, 21912133, 21912174, G02B 2608

Patent

active

053030818

ABSTRACT:
It is profitable to oscillate a beam on objects when a high power CO.sub.2 laser beam or a high power YAG laser beam welds or anneals the objects. In order to let a laser beam scan, a device for reciprocating a lens or a device for rotating two mirrors synchronously has been proposed. These devices suffer from the difficulty of cooling. Prior devices are not applicable to a high power laser. A parallel laser beam is first reflected by a parabolic mirror. Then a mirror which is reciprocally swaying by a galvanometer reflects the beam toward the objects. A water inlet and an outlet are mounted on a rear surface of the swaying mirror. Cooling water is carried out through coiled tubes. Excellent heat diffusion prevents the galvanometer from malfunction.

REFERENCES:
patent: 4253739 (1981-03-01), Carlson
patent: 4400609 (1983-08-01), Pastushenko et al.
patent: 4721376 (1988-01-01), Fushchetto
patent: 4772110 (1988-09-01), Roszhart
patent: 5094519 (1992-03-01), Ealey et al.
patent: 5148326 (1992-09-01), Hohberg
patent: 5172277 (1992-12-01), Wahl et al.
patent: 5208439 (1993-05-01), Arai
patent: 5237150 (1993-08-01), Karube
Hirosaki et al, "Application of Beam Scanner to Laser Welding", Japanese Society of High Temperature, vol. 15, No. 6, p. 286 (1989).

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