Canon Kabushiki Kaisha

Takashi Odate

Keizo Kojima

Hidetoshi Hanamoto

Nozomu Nakajima

Keisuke Samejima

Junji Suzuki

Atsushi Ohno

An image forming apparatus includes a sheet feeding portion, a detecting portion, and a controller. The controller sets a state of the detecting portion at a first monitoring state in which a detection result of the detecting portion is acquired to detect presence or absence of the recording material by supplying the electric power to the detecting portion in a first cyclic period. In case that the detection result of the detecting portion changes in the first monitoring state, the controller switches the state of the detecting portion to a second monitoring state in which a detection result of the detecting portion is acquired by supplying the electric power to the detecting portion in a second cyclic period shorter than the first cyclic period.

Image forming apparatus

A motor control apparatus includes: a switching power supply; a first motor configured to operate with a voltage from the switching power supply; and a control unit configured to control the first motor, wherein the control unit is further configured to cause the switching power supply to supply power of the switching power supply to a load other than the first motor before detecting an initial position of a rotor of the first motor using a current flowing through the first motor.

Motor control apparatus and image forming apparatus that detect rotor position

The image forming apparatus including a fixing unit having a heat generation member; a switch unit configured to connect or disconnect a power supply path from an AC power supply to the heat generation member; a temperature detection unit configured to detect a temperature of the heat generation member; a control unit configured to perform operations to supply power to the heat generation member by controlling the switch unit according to a detection result of the temperature detection unit; a setting unit configured to set the switch unit to a state in which the switch unit cuts off the power supply path upon detecting an overheating state of the heat generation member based on a detection result of the temperature detection unit; and a first switch configured to supply or cut off a first driving voltage that drives the setting unit.

Image forming apparatus that disconnects a power supply upon detecting overheating

The power supply apparatus having two switching elements connected to a primary winding of a transformer includes an adjustment unit for adjusting a voltage and supplying the voltage to a control unit. This voltage results from application of a voltage induced in an auxiliary winding while current is flowing in a predetermined direction with respect to the auxiliary winding as a result of the first switching element turned on and the second switching element turned off, and a voltage induced in the auxiliary winding while current is flowing in the direction opposite to the predetermined direction with respect to the auxiliary winding as a result of the first switching element turned off and the second switching element turned on.

Power supply apparatus and image forming apparatus

The noise filter includes a first capacitor that is mounted on a substrate, and includes one end connected to a live side of an AC line of an AC voltage supplied from an AC power supply, a second capacitor including one end connected to a neutral side of the AC line, a first ground pattern to which another end of the first capacitor is connected, and a second ground pattern to which another end of the second capacitor is connected. The first ground pattern and the second ground pattern are not connected electrically on the substrate.

Power supply apparatus, image forming apparatus, and noise filter

An image forming apparatus includes a fixing portion for fixing an image formed on a recording material, the fixing portion including an endless belt, a heater contacted to an inner surface of the endless belt, a pressing member for forming a fixing nip with the heater with the endless belt in the nip, and a switching mechanism for switching a state of the fixing nip between a first state in which pressure at the time of a fixing operation is applied in the fixing nip and a second state in which the pressure at the time of the fixing operation is not applied in the fixing nip. When electric power is supplied to the heater in the second state, the switching mechanism operates to switch the state of the fixing nip from the second state to the first state.

A switching power supply includes a transformer, a switching unit configured to switch a voltage input to the primary side of the transformer, a control unit configured to control the operation of the switching unit, and a detection unit configured to detect as a voltage a current flowing through the primary side of the transformer and supply the voltage to the control unit, wherein the detection unit controls the voltage to be supplied to the control unit based on the operating state of the switching unit.

Growing community of inventors

Mishima, Japan

Takashi Odate