Multiple frequency ranging apparatus for focus control

Details Multiple frequency ranging apparatus for focus control Multiple frequency ranging apparatus for focus control

1981-08-12

1984-03-06

Adams, Russell E.

Recorders

Record receiver deforming

3541951, 346108, 367 96, G03B 1320

Patent

active

044350554

ABSTRACT:
A photoplotter includes an autofocus control for maintaining a precise focal distance between a photohead in the plotter and the film surface which is exposed by the head. The autofocus control employs a dual frequency ultrasonic ranging apparatus which permits coarse focus control at one frequency and fine focus control at a second, higher frequency.

REFERENCES:
patent: 3650615 (1972-03-01), Aoki et al.
patent: 4199246 (1980-04-01), Muggli

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