Automatic iris adjustment system

Details Automatic iris adjustment system Automatic iris adjustment system

1985-09-24

1987-01-20

Perkey, William B.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 5238

Patent

active

046383662

ABSTRACT:
An automatic iris adjustment system comprises a camera lens including an iris driving means for controlling the iris value; an image pickup element for converting the amount of light incident to the camera lens into an electrical signal; means for comparing the iris adjustment signal voltage V.sub.I from the image pickup element with the reference voltage V.sub.O to evaluate an error voltage V.sub.E (i.e., V.sub.E =V.sub.I -V.sub.O); means for calculating a varying component .DELTA.IRIS of iris control value as a predetermined function of the error voltage V.sub.E ; means for calculating an iris control value IRIS.sub.n basing on the calculated varying component .DELTA.IRIS of iris control value; and means for controlling the iris driving means in response to the calculated iris control value IRIS.sub.n.

REFERENCES:
patent: 3120161 (1964-02-01), Pickens et al.
patent: 3430053 (1969-02-01), Westhaver
patent: 4471383 (1984-09-01), Shiono et al.
patent: 4473843 (1984-09-01), Bishop et al.
patent: 4562476 (1985-12-01), Shikano et al.

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