Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-12-02
1983-01-25
Perkey, William B.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358227, 250201, G03B 310, H04N 526, G01J 144
Patent
active
043700381
ABSTRACT:
In a system for driving automatically an objective lens into a desired focal position so as to form a focussed image on a film plane, in order to derive a driving signal for a driving motor moving the objective lens along its optical axis, an auxiliary lens is arranged movably along its optical axis, a moving coil and a position detecting coil are wound around a lens holder, magnets cooperating with the coils are arranged around the coils, and an array of photoelectric converting elements is arranged to receive a light flux transmitted through the auxiliary lens. The auxiliary lens is vibrated about a reference position by supplying a sinusoidal signal to the moving coil. An output signal from the array of photoelectric converting elements is supplied to a focus detection circuit to generate sampling pulses at such timings that the photoelectric converting elements receive the best focussed image. An output signal from the coil is supplied to a lens position detecting circuit to produce a lens position signal representing a deviation of the auxiliary lens with respect to the reference position. The lens position signal is sampled and held by the sampling signal to produce the driving signal for the motor.
REFERENCES:
patent: 3896304 (1975-07-01), Aoki et al.
patent: 3917394 (1975-11-01), Sturdevant
patent: 3941996 (1976-03-01), Stauffer
patent: 4045805 (1977-08-01), Saito
Olympus Optical Company Limited
Perkey William B.
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