Abstract: A heater control is performed without problems when a normal detection of a power source frequency cannot be performed. A heater control apparatus is configured and arranged to be operable by an alternating current having one of a plurality of frequencies. The heater control apparatus detects a zero-cross point of a voltage waveform of the alternating current to be supplied to a heater so as to generate a zero-cross signal and controls an electric power supply to the heater by using the zero-cross signal as a reference. At a time of tuning a power on, the frequency of the alternating current is tentatively determined before the frequency is detected so as to control the electric power supply to the heater based on the tentatively determined frequency, and to control the electric power supply to the heater, after the frequency of the alternating current is detected, based on the detected frequency.

Abstract: A heater control is performed without problems when a normal detection of a power source frequency cannot be performed. A heater control apparatus is configured and arranged to be operable by an alternating current having one of a plurality of frequencies. The heater control apparatus detects a zero-cross point of a voltage waveform of the alternating current to be supplied to a heater so as to generate a zero-cross signal and controls an electric power supply to the heater by using the zero-cross signal as a reference. At a time of tuning a power on, the frequency of the alternating current is tentatively determined before the frequency is detected so as to control the electric power supply to the heater based on the tentatively determined frequency, and to control the electric power supply to the heater, after the frequency of the alternating current is detected, based on the detected frequency.

Abstract: An integrated circuit has a central processing unit for performing predetermined processing, and a communication circuit for performing data communication between the central processing unit and the outside of the integrated circuit. The communication circuit includes a data receiving unit for receiving items of data from a received signal at a time according to a given timing signal. The communication circuit also includes a time differing unit for providing a different time at which the data receiving unit receives the plural items of data from the received signal. The communication circuit also includes a selecting unit for selecting whether the time differing unit is used or not used and another selecting unit for selecting whether the given timing signal is supplied from the outside of the integrated circuit or is supplied by an internal pulse generating circuit provided in the integrated circuit.

Abstract: An electrostatic recording apparatus capable of setting any desired position on a recording medium for transferring a toner image, and a device for controlling the amount of toner supply in two-component development. A position for forming a reference latent image potential is shifted relatively based on shift data which is representative of a position for transferring the toner image of a potential corresponding to a document image to the recording medium, whereby rapid recording is promoted and, yet, adequate developer density control is achieved.