Patent ID: 11934134
Assignee: TOSHIBA TEC KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image forming apparatus, comprising:
an image forming unit to form an image on a sheet;
a sensor including a light emitting part with a light emission intensity that changes according to an input voltage level and a light receiving part that outputs an output value that changes according to the amount of incident light, the sensor configured to detect a toner density of the image formed by the image forming unit;
a power supply unit to supply power to the light emitting part and change the input voltage level of the power supplied to light emitting part in a predetermined sequence until an end condition is satisfied during an inspection operation; and
a controller configured to make an abnormality determination based on a state of the sensor when the end condition is satisfied during the inspection operation, wherein
the controller is configured to determine whether or not the state of the sensor is abnormal based on the input voltage level when the end condition is satisfied.