Patent ID: 11868061
Assignee: BROTHER KOGYO KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. The image forming apparatus according to claim 11,
wherein the deflector includes a polygon mirror, the deflector being further configured to scan the light beam in a scanning direction;
wherein the optical path is closed by a wall of the second developing unit;
wherein the controller is configured to start driving the deflector when receiving a command to perform image formation, and
wherein the controller is further configured to:
when the second developing unit is in the second position, cause the first light source to emit the first light beam over an area of a single surface of the polygon mirror including an exposure scanning range in the scanning direction within which the first photoconductive body is exposed to the first light beam to thereby obtain the detection signal of the first light beam from the optical sensor; and
after obtaining the detection signal, control the first light source to emit the first light beam only within a particular range outside the exposure scanning range in the scanning direction prior to controlling the cam to move the second developing unit to the first position.