Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1980-02-07
1981-11-10
Orsino, Jr., Joseph A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358228, 352141, H04N 530
Patent
active
043001670
ABSTRACT:
An automatic iris control system adapted to be connected between a video camera and optical input device which produces an optical image from a light directed upon and reflected from a subject wherein the optical image is directed onto the surface of an electronic imaging tube in the video camera and the optical image has a wide variation of reflected light due to variations in distance of the subject from the light source and wherein the automatic iris control system has an adjustable iris and drive motor located between the surface of the electronic imaging tube and optical input device for dynamically varying the intensity of the optical image applied to the electronic imaging tube of the video camera, a light intensity programming circuit for establishing a desired light intensity level on the surface of the electronic imaging tube of the video camera, and an automatic iris control circuit having a low gain amplifier, a weighted peak response detector, a comparator, a circuit for controlling current to the iris drive motor and a circuit for providing a feedback signal representing the direction in which the iris must be adjusted by the motor to control the light intensity on the surface of the electronic imaging tube of the video camera is shown.
REFERENCES:
patent: 4050085 (1977-09-01), Prince et al.
patent: 4158859 (1979-06-01), Kerbel
patent: 4190864 (1980-02-01), Dischert
Miller Frederick A.
Wooff, Jr. Edward A.
Circon Corporation
Coles Edward L.
Meaney, Jr. Daniel J.
Orsino Jr. Joseph A.
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