| 摘要 |
PURPOSE:To facilitate color temperature correction and to simplify circuit constitution by controlling a color temperature conversion according to color temperature information so that the filter is put on and off an optical path automatically. CONSTITUTION:When the color temperature conversion filter 24 is off the photographic optical path, a filter detecting circuit 25 detects that to switch the control voltages VR and VB of a white balance adjusting circuit 20 to the voltage which varys as shown by characteristics P, and sets the detected temperature of a color temperature detecting circuit 21 to specific temperature. Therefore, when the color temperature of object light rises above the specific temperature, the detecting circuit 21 generates an output, and when an L-level vertical blanking signal is generated, a timing setting circuit 22 sends an output to a filter control circuit 23 to put the color temperature conversion filter on the optical path. When the filter 24 is put on the optical path, the control voltages VR and VB are switched to the voltage which varys as shown by a characteristic curve Q, switching the detected temperature. |
