Image forming apparatus having a more smoothly controlled image

Details Image forming apparatus having a more smoothly controlled image Image forming apparatus having a more smoothly controlled image

1990-08-27

1992-05-05

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355211, 355271, 346160, 318685, 318696, G03G 1500

Patent

active

051112426

ABSTRACT:
An image forming apparatus for producing a visible image on an image forming medium includes a photosensitive drum for carrying a latent image thereon, a developer for developing the latent image to form a developed image on the photosensitive drum, and a transferring drum for supporting the image forming medium and transferring the developed image onto the image forming medium. The image forming apparatus further includes a stepping motor, which has a plurality of exciting windings, for rotating the photosenstive drum, a driver for driving the stepping motor, and a controller for controlling the driver such that the plurality of exciting windings are switched to be excited in a prescribed manner, the controller periodically varying the switching time intervals for exciting the windings in correspondence to variations in the rotational speed of the stepping motor.

REFERENCES:
patent: 4145644 (1979-03-01), Liu
patent: 4578689 (1986-03-01), Spencer et al.
patent: 4710691 (1987-12-01), Bergstrom et al.
patent: 4723145 (1988-02-01), Takada et al.

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