Exposure adjustment device for electrostatic copying apparatus
AssigneeMita Industrial Co., Ltd.
InventorsTakaji Washio, Masami Kai
Life of this patent
Estimating the term…
Abstract
An exposure adjustment device for an electrostatic copying apparatus provides that electric power of an exposure lamp is controlled by pressing a key so as to cause copy density over a surface of a photoconductive member to be adjusted. The exposure lamp is energized electrically subsequent to change a of copy density from a set level to a standard level predetermined for obtaining an ordinary copy when a period predetermined by a timer elapses after copying operation finished and/or after the key is operated. This results in that the copy density of exposure is accomplished properly even if an operator forgets to adjust the copy density of exposure.
Claims3
An adjustment device, for use in an electrostatic copying apparatus to make copies of an original, for selectively setting the number of copies to be made during a particular copying operation of the apparatus, and for selectively adjusting the electrical energization of an exposure light source of the apparatus, thereby to adjust the copy density of exposure during the copying operation, said adjustment device comprising:
- keyboard means for, in one input mode, inputting a selected number of copies to be made during the particular copying operation of the electrostatic copying apparatus, and for, during another input mode, inputting a selected copy density of exposure value, said keyboard means adapted to be connected to the electrostatic copying apparatus such that the apparatus conducts the copying operation to make said selected number of copies at said selected copy density of exposure value;
- change-over switch means for switching said keyboard means between said one and another input modes;
- latch circuit means, operatively connected to said keyboard means when in said another input mode for storing an electrical first signal representative of said selected copy density of exposure value, and adapted to be connected to the exposure light source of the apparatus for transferring said first signal thereto for controlling the electrical energization thereof;
- copying operation responsive control circuit means, adapted to be responsive to the completion of the copying operation, for generating an electrical second signal representative thereof;
- and
- timer means for receiving said second signal from said control circuit means and for, after the lapse of a predetermined period of time, releasing said first signal representative of said selected copy density of exposure value from said latch circuit means and storing therein an electrical third signal representative of a standard copy density of exposure value.
Dependencies are inferred from the claim text.