Abstract: A fixing heater includes a ceramic substrate; a heat generating resistor provided on the ceramic substrate to extend in a longitudinal axis of the ceramic substrate; a temperature detecting element for detecting a temperature of the ceramic substrate; and an electrically conductive member provided on the ceramic substrate to extend in the longitudinal axis of the ceramic substrate.

Abstract: In an apparatus which cannot detect a size of recording sheet before the recording sheet is fed, the first recording sheet is regarded as having the maximum size and paper feeding is controlled on this basis and the size of the sheet is measured during the conveyance of the recording sheet. For the second or third and subsequent recording sheets, paper feeding control is executed at a paper feeding interval at which a maximum throughput is obtained in accordance with the measured size.

Abstract: A fixing heater includes a dielectric substrate, a resistor formed on the substrate and Laser-trimmed in a current flow direction, a slidable film, and backup member forming a nip with the film. The trimmed portion lies outside the nip.

Abstract: A heat fixing apparatus includes a heater; a temperature sensor for sensing a temperature of the heater; a bias wave number determining limit for determining the number of bias waves corresponding to a predetermined image fixing temperature in accordance with utility voltage source voltage; a bias wave number changing unit for changing a bias wave number in accordance with temperature changing rate of the heater; and a supply wave number control unit for controlling the number of waves supplied to the heater in accordance with an output of the temperature sensor and bias wave number. The unit includes a PID controller.

Abstract: The present invention provides a laser beam scanning apparatus comprising a laser unit for emitting a laser beam, and a print circuit board having control means for controlling ON/OFF of the laser unit. The laser unit is provided directly on the print circuit board.

Abstract: An image heating apparatus includes a heater; a heat transmitting member for transmitting the heat from the heater to an unfixed toner image while moving in contact with a recording material bearing the unfixed image; a pressure roller for forming a nip between the heat transmitting member and itself; wherein the heat transmitting member has a conductive surface; the pressure roller has a conductive core member; and wherein the image heating apparatus further contains a rotating conductive member on the conductive core material in contact with the conductive surface.

Abstract: An image forming apparatus includes a fixing heater driven by a voltage supplied from a commercial power supply, a transformer for transforming the voltage supplied from the commercial power supply into a predetermined voltage, and supplying the predetermined voltage to a load in the apparatus, and a controller for detecting the voltage transformed by the transformer, and controlling energization to the fixing heater.