The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1976
Filed:
Dec. 26, 1974
Takashi Shinozaki, Yokohama, JA;
Seigo Kokufukata, Tokyo, JA;
Victor Company of Japan, Limited, Yohohama, JA;
Abstract
A dark current correction circuit in a two-tube color camera having first and second camera tubes respectively for chrominance signals and luminance signals comprises a circuit for applying to the first camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, a circuit provided in the picked-up output signal system of the first camera tube and operating to compensate or cancel a dark current component within the picked-up output signal, a circuit for applying to the second camera tube a target voltage in accordance with temperature variation in the image pickup surface thereof, and a circuit for mixing with the picked-up output luminance signal of the second camera tube a horizontal blanking pulse at a level in accordance with the temperature variation in the image pickup surface of that camera tube. The level controlled horizontal blanking pulse, upon being applied to the picked-up output luminance signal, effects correction of a dark current variation component within the luminance signal due to temperature variation in the image pickup surface of the camera tube and for a dark current variation component due to variation of the target voltage.