Abstract: In a case of forming a color image by superimposing a plurality of colors of plane images, the plurality of colors of plane images are superimposed such that positions of these images are not displaced or aberrated irrespective of influence by a change in time, thereby resultingly forming a high-quality color image. Especially, in consideration of image data supplying from an external apparatus, the load on an image formation apparatus is reduced.

Abstract: Disclosed is a recording system in which an operation performed on the side of a printer unit in order to change over recording density is delayed while a recording operation is in progress. When a recording density changeover command is received during a recording operation, the density changeover is performed after the recording operation ends. A control unit which controls the printer unit is informed of the fact that the measures for changing over the recording density have been completed on the printer unit side.

Abstract: When a recording medium fed from a sheet feed drive mechanism is detected at a predetermined position, the counting of a loop feed time or the like variably set in accordance with a predetermined sheet feed condition such as the sheet type or particular supplying device is started, and the drive of the sheet feed drive mechanism is controlled by terminating the feeding operation in accordance with a count termination state. A count time of a timer for detecting a feed jam is variably set in accordance with a sheet feed condition such as material of sheet.

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: A semiconductor device includes a chip, a laser element formed on the chip and a heating element formed on the chip. The laser element is driven to emit a laser beam upon light-on of a laser. Upon light-off of a laser, switching is made so that the heating element is driven so as not to emit the laser beam in the normal laser beam emission direction by the laser element.

Abstract: An image recording apparatus for printing an image on a conveyed recording medium, includes a sensor, arranged on a convey path of the recording medium, for detecting presence/absence of the recording medium, a setting unit for setting a debouncing time of the recording medium, and a switching unit for switching the debouncing time.

Abstract: A heating apparatus comprising a heating member, energization element for energizing said heating member, a temperature detection member for detecting a temperature of said heating member, a first switching element for turning on/off energization by said energization means on the basis of the temperature detected by said temperature detection member, abnormal current detection element for detecting an abnormal current flowing through said heating member, a second switching element for turning off energization by said energization element, and energization stop member for operating said second switching element to turn off energization.

Abstract: An image recording apparatus operated in synchronism with a vertical synchronization signal from an external device comprises a unit for sending out to the external device a signal indicating a status to accept the vertical synchronization signal, and switching device for switching between a plurality of operation modes related to an elapsed time from the send-out of the signal by the signal sending unit.

Abstract: An image forming apparatus includes an image forming device for forming an image on a recording material, the image forming device including an image bearing member, a movable charging member for charging the image bearing member and a power source for supplying electric power to the charging member; a constant current controller for supplying the charging member with a predetermined constant level of electric current; and a second controller for controlling an image forming condition by the image forming device on the basis of plural voltage provided at different points of time during a constant current control operation with the same constant current level by the constant current controller.

Abstract: A light quantity control device suitable for use in a laser beam printer includes a beam generator, a monitor for monitoring the quantity of light of a beam generated by the beam generator, and a controller. The controller controls the light quantity of the beam generated by the beam generator in response to the output of the monitor. The controller includes a digital value output circuit and a light quantity control circuit. The digital value output circuit outputs a digital value representing the quantity of light of the beam, and the light quantity control circuit controls the quantity of light in response to the digital value. The digital value output circuit varies the timing of output of the digital value in accordance with the output of the monitor.