Color television camera

Abstract

Abstract PURPOSE:To ensure the automatic control of white balance, by providing a camera pickup element and a detector independently that detects plural optical components having different spectral characteristics. CONSTITUTION:An optical component detector 30 charges capacitors 37, 38 and 39 up to the level of a power supply voltage VB by the reset signals of resetting transistrs (TR) 31, 32 and 33. The internal resistance varies according to the incident light volume for photoconductive elements 34, 35 and 36 corresponding to each color of red, blue and luminance respectively. In the case of a TV camera of double frequency separation system, a color filter having the approximate spectral distribution characteristics to that of red, blue and luminance of the TV camera is put between an object and diodes 34, 35 and 36, along with use of output RT, BT and YT of the diode. Thus the white balance is controlled automatically using each output of RT, BT and YT.

Inventors

• 👤 Yoshinori Kitamura
• 👤 Masaaki Nakayama

Bibliographic Details