| 摘要 |
<P>PROBLEM TO BE SOLVED: To digitally control the cycle of blinking or the cycle of lighting and turning-off of an illumination lamp with the lapse of time by a simple and inexpensive circuit configuration to increase light quantity of the illumination lamp. <P>SOLUTION: Illumination lamp drive circuits 108a, 108b and slave unit control circuits 110a, 110b which constitute a light quantity control unit of slave units 1a, 1b perform PFM driving for the cycle of blinking of illumination lamps 102a, 102b which are turned on for securing brightness of a video imaged by cameras 101a, 101b to change the cycle of blinking with the lapse of time; or perform PWM driving for the cycle of lighting and turning-off of the illumination lamp to change the cycle of the lighting and turning-off with the lapse of time, to increase light quantity of the illumination lamp. <P>COPYRIGHT: (C)2012,JPO&INPIT |
