Patent ID: 9632450
Date: 2017-04-25
CPC Classifications: G02B,G03G

Claim:
1. An image forming apparatus comprising: a photosensitive member; a light-emitting element for emitting a laser beam; a driving unit configured to drive the light-emitting element with a driving current, wherein the driving unit causes the light-emitting element to emit light at a first light emission intensity and at a second light emission intensity lower than the first light emission intensity; and a polygon mirror configured to scan the photosensitive member with the laser beam while rotating at a predetermined speed, wherein the driving unit causes the light-emitting element to emit light at the first light emission intensity with a driving current obtained by adding a second driving current to a first driving current, and causes the light-emitting element to emit light at the second light emission intensity with the second driving current, and wherein the driving unit executes a first adjustment for causing the light-emitting element to emit light at the first light emission intensity to adjust the first driving current, and a second adjustment for causing the light-emitting element to emit light at the second light emission intensity to adjust the second driving current, and wherein the driving unit, during a time period after the polygon mirror starts rotating until the predetermined speed is reached, performs the first adjustment and the second adjustment, and after the polygon mirror has started rotating and before the second adjustment is performed, causes the light-emitting element to emit light with an initial driving current to the first driving current to perform the first adjustment for adjusting the first driving current, the initial driving current is larger than the second driving current and is smaller than the driving current, and thereafter performs the second adjustment for causing the light-emitting element to emit light at the second light emission intensity with the second driving current.