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

Claim 9:
10. An image forming apparatus, comprising:
a transfer belt;
an image forming unit configured to form a toner image on the transfer belt;
a transfer roller at which the toner image on the transfer belt is transferred to a sheet;
an optical sensor configured to detect a density of the toner image on the transfer belt at position between the image forming unit and the transfer roller; and
a controller connected to the optical sensor and configured to:
control an input voltage supplied to a light emitting element of the optical sensor during an inspection operation,
detect an output voltage supplied from a light receiving element of the optical sensor during the inspection operation, and
make an abnormality determination based on values of the input voltage and the output voltage when an end condition of the inspection operation is satisfied, wherein

the controller is configured to determine whether or not the state of the optical sensor is abnormal based on the input voltage when the end condition is satisfied.