Automatic focusing system employing two variable frequency oscil

Details Automatic focusing system employing two variable frequency oscil Automatic focusing system employing two variable frequency oscil

1976-05-17

1977-11-29

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250204, 356 4, G03B 708, G01C 308

Patent

active

040603253

ABSTRACT:
In an automatic focusing system having an objective spaced an adjustable distance from an image plane, two variable frequency oscillators, each controlled by a separate photoconductor element, produce two variable-frequency signals that have substantially the same frequency when light passing through the objective is brought into focus at the image plane. The two variable-frequency signals are compared, and, upon detecting a difference in frequency between them, the spacing between the objective and the image plane is adjusted to a relative position at which the frequencies thereof are substantially the same.

REFERENCES:
patent: 3899251 (1975-08-01), Frenk et al.
patent: 3988747 (1976-10-01), Lermann et al.

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