Color temperature compensation device for color television cameras

Abstract

Abstract PURPOSE:To attain proper color temperature compensation by providing plural pairs of color detectors in or at the back side of a photographic lens of a color television camera. CONSTITUTION:The color detectors 31, 32 are arranged at the back side and on the lower circumference of the photographic lens 36. The reflected light and its surrounding light of an object detected by the color detectors 31, 32 are converted into an electric signal, which is applied to a color temperature detector 33 and a color temperature signal is outputted. This color temperature output signal is applied to color temperature compensators 34, 35 and a variable gain amplifier 12 for a red signal and a variable gain amplifier 13 for a blue signal, where the gain is adjusted and proper color temperature compensation is attained. The proper color temperature compensation is attained in this way. The similar effect is obtained even by inserting the color detectors 31, 32 in the photographic lens system. Further, the effect is further improved by providing plural pairs of the color detectors.

Inventors

• 👤 Takao Kinoshita
• 👤 貴雄 木下

Bibliographic Details