Multi-lens focussing arrangement for laser graphics imaging appa

Details Multi-lens focussing arrangement for laser graphics imaging appa Multi-lens focussing arrangement for laser graphics imaging appa

1988-11-18

1990-06-19

Henry, Jon W.

Electric heating

Microwave heating

Tunnel furnace

350527, 350521, 21912175, 21912183, G02B 2700, G02B 2112, G02B 2712, G02B 1514

Patent

active

049347993

ABSTRACT:
An arrangement for focussing a laser beam onto the imaging surface of a laser graphics imaging apparatus includes a viewing stage having a focussing lens and an associated eye lens that are mutually displaceable along a first optical axis through which the imaging surface is monitored in the course of the formation of a laser graphics pattern. Coupled with the viewing stage is a laser-beam imaging stage having a beam diameter adjustment lens and a beam splitter disposed along a second optical axis which intersects the first optical axis. The location of the beam splitter is such that a laser beam incident along the optical axis of the laser beam-imaging stage is directed through and focussed by the focussing lens onto the imaging surface. Displacement of the beam diameter adjustment lens causes the diameter of the pattern-forming laser beam to be varied. The beam splitter is disposed along the optical axis of the first stage at a location between the focussing lens and associated eye lens that is fixed relative to the imaging surface irrespective of displacement of the focussing lens and the eye lens with respect to the imaging surface. The laser beam is focussed onto the imaging surface by adjusting the displacement of the focussing lens relative to the imaging surface.

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patent: 4515445 (1985-05-01), Muller et al.
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patent: 4523799 (1985-06-01), Delhaye et al.
patent: 4573467 (1986-03-01), Rich et al.
patent: 4634240 (1987-01-01), Suzuki et al.

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