Focussing system with automatic control of emitted radiant power

Details Focussing system with automatic control of emitted radiant power Focussing system with automatic control of emitted radiant power

1979-04-09

1982-02-02

Hartary, Joseph W.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354195, 250355, 250205, G03B 300, G03B 310

Patent

active

043136559

ABSTRACT:
A focussing system of the type which emits radiation from the camera towards the subject, with the radiation reflected from the subject being incident upon a receiving transducer generating an electrical signal from which focus-control information is derived. The emitted radiant-power level is automatically controlled in dependence upon camera-to-subject distance, preferably in dependence upon the power level of the reflected-back radiation incident upon the receiving transducer, even when the focus-control information required for primary system operation is independent of such power level. This makes possible various important improvements, including: automatic lowering of the emitted-power level in close-up contexts, especially where a danger of eye damage might exist; more generally, automatic matching of emitted-power level to the needs of the signal-processing circuitry, permitting signal-processing stages of narrower operative range to be employed on account of the narrower variations in power level of the signal produced by the receiving transducer; and lowered power consumption. Preferably, when a focussing operation is initiated, the emitted power level is initially low or zero and is progressively increased to an automatically selected value without overshoot.

REFERENCES:
patent: 3815994 (1974-06-01), Peckham
patent: 4150888 (1979-04-01), Filipovich
patent: 4178087 (1979-12-01), Shenk

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