Control system for varifocal objective

Details Control system for varifocal objective Control system for varifocal objective

1977-05-26

1979-07-17

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

350 44, 350187, 352140, 358227, G02B 711, G02B 1514

Patent

active

041617568

ABSTRACT:
The correlated positions of two axially shiftable components of a varifocal objective, i.e., a variator and a compensator, throughout a zoom range are stored in a memory from which they can be read out to control respective drives during a zooming operation. The readout rate is determined by a speed selector which sets a frequency for the pulsing of a control unit that scans successive memory addresses. The memory may also contain data for focusing control, either through axial adjustment of a front component of the objective or through modification of the positional correlation of the two shiftable components, as well as for an adjustment of a diaphragm with changes in the overall focal length.

REFERENCES:
patent: 3283231 (1966-11-01), Askew
patent: 3400212 (1968-09-01), Plummer
patent: 3548731 (1970-12-01), Barr

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