Abstract: An original size detecting apparatus is capable of carrying out accurate original size detection without erroneous detection of the size of an original due to the influence of external scattered light. A CCD reads reflected light of light irradiated from a light source onto an original placed on an original platen glass. Optical sensors detect two open states of the original presser plate, and a scanner controller performs predetermined control corresponding to each of the open states of the original presser plate detected by the optical sensors, to determine the size of the original based on the result of the reading by the CCD.

Abstract: 50 An image forming apparatus having a pair of sheet transporting members having rotary shafts on the same axis in a direction perpendicular to the transport direction of a sheet, and rotatively driven independently of each other to thereby transport the sheet, a detector provided along a cross direction perpendicular to the transport direction of the sheet for detecting the transported state of the sheet transported by the sheet transporting members, and a controller for drive-controlling the pair of sheet transporting members on the basis of the detection information of the detector, and effecting the correction of a sheet position in the cross direction and the correction of the skew feed posture of the sheet relative to the transport direction.

Abstract: A data transfer system capable of effectively performing serial communication by dividing communication lines into one or plural systems and using the divided lines, according to the number of communication IC's connected on the communication line and a load condition connected to the communication IC is provided. In this system, plural communication lines 410 and 411 are prepared, and the lines 410 and 411 are time divisionally selected according to the contents of connection information set in a select register 462, whereby the serial communication between communication IC's 402 to 405 and a communication controller 401 can be effectively performed.

Abstract: A data transfer system capable of effectively performing serial communication by dividing communication lines into one or plural systems and using the divided lines, according to the number of communication IC's connected on the communication line and a load condition connected to the communication IC is provided. In this system, plural communication lines 410 and 411 are prepared, and the lines 410 and 411 are time divisionally selected according to the contents of connection information set in a select register 462, whereby the serial communication between communication IC's 402 to 405 and a communication controller 401 can be effectively performed.

Abstract: This specification discloses a heater comprising an electrically conductive substrate, a first electrically insulating layer formed on the electrically conductive substrate, a heat generating resistor formed on the first electrically insulating layer, and a second electrically insulating layer formed on the heat generating resistor, wherein when the glass transition temperature of the first electrically insulating layer is defined as T1 and the glass transition temperature of the heat generating resistor is defined as T2 and the glass transition temperature of the second electrically insulating layer is defined as T3, T1, T2 and T3 have the relation that T1>T3≧T2 or T1>T2≧T3. The specification also discloses an image heating apparatus using such heater.

Abstract: This specification discloses a heater comprising an electrically conductive substrate, a first electrically insulating layer formed on the electrically conductive substrate, a heat generating resistor formed on the first electrically insulating layer, and a second electrically insulating layer formed on the heat generating resistor, wherein when the glass transition temperature of the first electrically insulating layer is defined as T1 and the glass transition temperature of the heat generating resistor is defined as T2 and the glass transition temperature of the second electrically insulating layer is defined as T3, T1, T2 and T3 have the relation that T1>T3≧T2 or T1>T2≧T3. The specification also discloses an image heating apparatus using such heater.

Abstract: A communication control system includes a first communication control apparatus connected to one end portion of each of a clock signal line and a data signal line, and a second communication control apparatus connected to the other end portion of each of the clock signal line and the data signal line.

Abstract: A communicating apparatus for performing a serial communication with a plurality of communication control units which are cascade connected, including a communicating unit for performing a serial communication with each of the communication control units, a storing unit for storing position data indicative of the order of the communication control units which are cascade connected, and a diagnosing unit for diagnosing a communication abnormal portion on the basis of the position data stored in the storing unit. The diagnosing unit executes a predetermined communication with the communication control unit existing at a position that is closest to the communicating apparatus on the basis of the position data stored in the storing unit and performs a diagnosis on the basis of a result of the predetermined communication. The communicating unit transmits address data to designate the communication control unit to be communicated.

Abstract: A communication control system includes a first communication control apparatus connected to one end portion of each of a clock signal line and a data signal line, and a second communication control apparatus connected to the other end portion of each of the clock signal line and the data signal line.

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 data processing apparatus includes an image data generating section for generating image data, and an interpolation image data forming section for forming and outputting interpolation image data based on the image data generated by the image data generating section. The interpolation image data forming section includes a memory for storing the image data generated by the image data generating section.

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: A laser scanner control circuit which is used for an apparatus for scanning onto a photo sensitive material by a laser beam and forming and image thereon is constructed as a monolithic driver IC onto a single chip. A reset circuit is provided for a sample-hold circuit so as to minimize the laser power when the image forming apparatus is in a standby mode. A circuit to detect an abnormality of the laser power is further provided. Due to this, the safety of the laser power control of the sample-hold circuit is improved. The operation of the sample-hold circuit can be started at a time point when the laser emitting operation is stable.

Abstract: A fixing apparatus includes a heating member; a temperature detecting member for detecting the temperature of the heating member; a power supply controller for controlling the power supply to the heating member so that the temperature detected by the temperature detecting element during a fixing operation is maintained substantially constant at a predetermined fixing temperature; and a temperature selecting device for selecting a fixing temperature in response to both the temperature of the heating member before beginning of the fixing temperature control and a rate of the temperature change of the heating member upon supplying a predetermined amount of power to the heating member or upon turning it off.

Abstract: The present invention provides an image forming apparatus in which the first lead wire which transmits a detection signal indicating the remaining amount of toner in the developing unit into a circuit for comparison with the reference voltage, and the second lead wire are arranged parallel. One end of the second lead wire is connected to the reference voltage generating side and the other end is electrically open.

Abstract: A recorder has recording apparatus for recording data sent from a data source on a record medium at a selected one of a plurality of recording densities, and control apparatus for sending a signal indicating a record ready status of the recorder to the data source during the switching of the recording density in the recording apparatus. When the control apparatus receives the recording density switching command during the record operation, it holds the command, and after the end of the recording operation, it controls the recording apparatus in accordance with the held command to switch the recording density.

Abstract: There is disclosed a laser driving device capable of providing a stable laser emission regardless of the ambient temperature, by supplying a laser element with a first current and a second bias current with a controlled ratio therebetween.

Abstract: A light quantity control device suitable for use in a laser beam printer. A controller varies the quantity of light emitted by a semiconductor laser so as to maintain a constant light quantity, regulating the rate of variation of the light quantity according to the output of a monitor for detecting the quantity of light emitted from the semiconductor laser.

Abstract: An image forming apparatus includes an recording medium, a beam radiating unit for radiating a beam to form an image on the recording medium, and a drive unit for driving the recording medium, wherein the drive unit has a stepping motor for performing a step operation of the recording medium.