| 摘要 |
An illumination apparatus for use with a machine vision camera comprises at least one light source, preferably one or more LEDs, and control circuitry. The control circuitry is operative to receive an illumination command signal and selectively cause application of power to the light source in response thereto. The circuitry includes an electronic switch connected in circuit with the light source. Override circuitry is connected to control operation of the electronic switch so as to cause flow of current through the light source upon receipt of the illumination command signal in a variable manner so as to limit power dissipation.
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