Laser scanner incorporating variable focus mechanism for rapidly

Details Laser scanner incorporating variable focus mechanism for rapidly Laser scanner incorporating variable focus mechanism for rapidly

1994-11-14

1997-04-15

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359201, 359202, 359208, 359212, 359213, 359214, 359215, 359219, G02B 2608

Patent

active

056215614

ABSTRACT:
An apparatus for rapidly varying the spot size of a scanned imaging laser beam comprises a focusing device (e.g. focussing and collimating lens arrangement) and a beam displacement control device (e.g. a rotary actuator scanner mirror or linear actuator). The beam displacement control device is operative to cause relative displacement between the laser beam and a selected one of a plurality of reflector element positions. Respective ones of the plurality of reflector positions are located at respectively different separation distances from the focusing device. As a result, in the course of traveling along an laser beam path, the laser beam is incident upon the focusing device and the reflector element, so as to be directed to a given spatial location along the path, whereby the laser beam has a resultant beam width that is dependent upon the separation distance between the selected reflector element position and the focusing device.

REFERENCES:
patent: 4060322 (1977-11-01), Hirayama et al.
patent: 4167024 (1979-09-01), Hamisch
patent: 4797551 (1989-01-01), Ferrante

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