Color television camera with test pattern

• US 4,308,551 A
• Filed: 03/18/1980
• Issued: 12/29/1981
• Est. Priority Date: 03/19/1979
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Araki, Toshio, Ohnuma, Takashi, Kanie, Shiomi
• Primary Examiner(s): RICHARDSON, ROBERT
• Application Number:
  US06/131,491
• Time in Patent Office: 651 Days
• Field of Search: 358/10, 358/29, 358/55, 358/41
• US Class Current: 348/175
• CPC Class Codes: H04N 23/13 with multiple sensors

Abstract

This specification discloses a color television camera having a test pattern projecting device. This test pattern projecting device projects a test pattern image of a desired color temperature onto an image pickup device. The color temperature of the test pattern image is adjustable.

Claims

1. A television camera having a test pattern projector, comprising:

an objective lens;

a color resolving optical system disposed on the optic axis of said objective lens;

an image pickup device for photographing a monochromatic image formed by said objective lens and said color resolving optical system;

a test pattern chart projecting device including a test pattern chart for forming a monochromatic test pattern image on said image pickup device; and

a variable color temperature illuminating device for illuminating said test pattern chart, said illuminating device comprising at least two light sources having different wavelength widths, a plurality of circuits having different set values for setting the quantity of light of said light sources, and a switching circuit for selectively applying the signal from said setting circuit to said light sources.

2. The television camera according to claim 1, wherein a power amplifying circuit is provided between said setting circuit for setting the quantity of light of said light sources and said light sources.