Image forming apparatus with rotary polygon mirror speed control

摘要

An image forming apparatus including: a reading device; an operating portion; a light source; a rotary polygon mirror; a motor configured to rotate the rotary polygon mirror; and a motor control portion configured to start the motor to control the motor at a first rotation speed in response to a fact that a predetermined action is performed on one of the operating portion and the reading device in a stopped state of the rotary polygon mirror, and then to control the motor at a second rotation speed higher than the first rotation speed in response to an instruction to start image formation from the operating portion, the motor control portion being configured to control the motor at the second rotation speed, without controlling the motor at the first rotation speed, in response to a fact that the receiving portion receives image data before the motor reaches the first rotation speed.

主权项

1. An image forming apparatus, comprising:
a receiving portion configured to receive image data from an external information device; a reading device configured to read an original to generate image data; an operating portion through which an image forming condition and an instruction to start image formation are input; a light source configured to emit a light beam for forming an electrostatic latent image on a photosensitive member; a rotary polygon mirror configured to deflect the light beam so that the light beam scans the photosensitive member; a motor configured to rotate the rotary polygon mirror; a motor control portion configured to start the motor to control the motor at a first rotation speed in response to a fact that a predetermined action is performed on one of the operating portion and the reading device in a stopped state of the rotary polygon mirror, and then to control the motor at a second rotation speed higher than the first rotation speed in response to the instruction from the operating portion, the motor control portion being configured to control the motor at the second rotation speed, without controlling the motor at the first rotation speed, in response to a fact that the receiving portion receives the image data before a rotation speed of the motor reaches the first rotation speed; and a light source control portion configured to control the light source to emit the light beam based on the image data in a state in which the rotary polygon mirror is rotated by the motor at the second rotation speed.