| 摘要 |
An arrangement for controlling the exposure times of duplicators. In addition to the light source used for carrying out the exposure, a constant light source is used for applying the light to the photoelectric device in the duplicator, when the duplicator is not in use, for the purpose of maintaining the photoelectric fatigue effect constant. The constant light source is also used for calibrating the controlling circuitry for the exposure time. A timer connected to the switching circuitry which establishes the exposure interval gives an indication of the measured time interval. Adjustable resistors permit settings and compensations for the varying characteristics of the duplicating paper, as well as the characteristics of the individual duplicating machines.
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