Title:
WHITE BALANCE ADJUSTING DEVICE
Document Type and Number:
Japanese Patent JPS6367995
Kind Code:
A
Abstract:
PURPOSE:To continuously obtain normal color reproductivity by providing a switch circuit for interupting an output when the output of a light source spectral characteristic detecting part is quickly changed and holding the output of the light source spectral characteristic detecting part by a holding circuit immediately before the change during the interruption period of this switch circuit. CONSTITUTION:The switch circuit 55, when a control terminal 55a goes to the signal of high level, is interupted. Since the holding circuit 57 is constituted, as shown in the drawing, the output of a low pass filter 51 is continuously held and outputted. A low pass filter 59 may be provided as necessary, for removing a switching noise or the like generated from the switch circuit 55 or the like. The switch circuits 55, 56 are simultaneously interrupted for a constant period, thereby, an unnatural coloring generated at the time of opening and closing only one side switch circuit can be prevented. By providing the low pass filters 51, 52, the timing for opening and closing the switch circuits 55, 56 can be matched with the timing of a malfunction signal due to the shielding of light or the like.
Inventors:
SUGIURA HIROAKI
Application Number:
JP21174286A
Publication Date:
March 26, 1988
Filing Date:
September 10, 1986
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H04N9/04; H04N9/73; (IPC1-7): H04N9/04; H04N9/73
Attorney, Agent or Firm:
Hiroaki Tazawa