Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: It is an object to provide an adding technique for enabling additional information to be certainly decoded from an image to which two or more kinds of additional information was added to an input image so that it is difficult to discriminate by the human eyes. To accomplish this object, for example, a plurality of kinds of additional information is periodically added to the input image at different periods so that it is difficult to discriminate by the human eyes. The image to which those additional information was added is outputted to an image forming unit.

Abstract: An image forming apparatus includes a scan unit for scanning a light beam modulated based on an image signal in the main scan direction, and a drive unit for rotating an image carrier in the subscan direction of an image. The rotation period of the image carrier is set to be an integer multiple of the scan period in the main scan direction of the light beam by the scan unit.

Abstract: A method of controlling the intensity of scanning light in a color image forming apparatus in which a photosensitive member is scanned with light modulated according to an image signal, comprises: a first step of turning on a light source of scanning light in order to illuminate at least the whole of one main scanning line before image formation based on the first color component, and controlling the light source according to the intensity of scanning light; a second step of controlling the light source according to the intensity of scanning light during scanning of a non-image scanning area before the image formation based on the first color component and after the intensity control of the first step; and a third step of controlling the light source according to the intensity of scanning light during scanning of a non-image scanning area between two cycles of image formation based on a color component.

Abstract: An electrographic recording apparatus having a memory for storing first and second images having different sizes and using an intermediate transfer member compares sizes of the input images of first page and second page with a size of a transfer area of the intermediate transfer member, and when a sum of the sizes of the images of the first page and the second page is less than the size of the transfer area, controls image forming means to transfer developed images of the first page and the second page to the intermediate transfer member in one process to reduce a time required for recording in a multiple sheet image recording mode.

Abstract: An image forming apparatus has a fixing device for fixing an image formed on a recording medium, a device for detecting an operating environment of the image forming apparatus, a selecting device for selecting a fixing device temperature in accordance with a detection result, and a control device for controlling the temperature of the fixing device to a selected fixing device temperature. The image forming apparatus is capable of efficiently bringing out the functions of a print engine thereof at a minimum cost without the need for adding a new high-speed device, achieving a higher printing speed and ensuring a good fixing property regardless of the thickness of paper used, while preventing wasteful energy consumption and adverse influences by heat.

Abstract: An image processing apparatus includes a first delay generation circuit, requiring no high-frequency clocks, for obtaining a pixel formation start timing signal from a digital input signal, a second delay generation circuit, requiring no high-frequency clocks, for obtaining a pixel formation end timing signal from the digital input signal, and a unit for obtaining a pixel formation interval signal from the pixel formation start and end timing signals.

Abstract: In an image forming apparatus in which scanning of a laser beam modulated by an image signal is performed, and a laser is forced to be turned on in a non-image period in line scanning of the laser beam, an interrupt request is issued to a microcomputer in response to a forced turn-on signal. In a routine that is called in response to the interrupt request, the level of the forced turn-on signal is checked. If no forced turn-on signal is generated, then acquisition of a detected laser beam intensity signal is inhibited. This ensures that the acquisition of the laser beam intensity signal is performed only when the laser is in a normal turn-on state. If a forced turn-on signal is generated, the laser beam intensity signal is acquired, and the laser beam intensity is adjusted according to the acquired value of the laser beam intensity signal.

Abstract: An image forming apparatus includes a scan unit for scanning a light beam modulated based on an image signal in the main scan direction, and a drive unit for rotating an image carrier in the subscan direction of an image. The rotation period of the image carrier is set to be an integer multiple of the scan period in the main scan direction of the light beam by the scan unit.

Abstract: This disclosure relates to an image forming and processing apparatus having a plurality of storage device capable of forming an image at a high speed by reading image data in parallel. Since a predetermined quantity of image data is stored in a plurality of hard discs, and the image data is read from the hard discs to a double buffer in parallel, an image can be formed continuously at a high speed. Another structure is arranged in a manner such that images are stored in hard discs of an optional number and the images are transmitted to a printer engine by using a FIFO (First In First Out) buffer which corresponds to the hard discs. Therefore, an image can be transmitted continuously at a high speed asynchronously with the printer output.

Abstract: This disclosure relates to an image forming and processing apparatus having a plurality of storage devices capable of forming an image at a high speed by reading image data in parallel. Since a predetermined quantity of image data is stored in a plurality of hard discs, and the image data is read from the hard discs to a double buffer in parallel, an image can be formed continuously at a high speed. Another structure is arranged in a manner such that images are stored in hard discs of an optional number and the images are transmitted to a printer engine by using a FIFO (First In First Out) buffer which corresponds to the hard discs. Therefore, an image can be transmitted continuously at a high speed asynchronously with the printer output.

Abstract: An image forming apparatus for forming an image on a recording medium has an image forming device for forming an image on the recording medium, a conveyance path for conveying the recording medium so that an image is formed by the image forming device, a first casing having a portion of the conveyance path, a second casing having a portion of the conveyance path and being openable relative to the first casing, and a third casing having a portion of the conveyance path and being openable relative to the second casing. The relatively openable casings, each having a portion of the conveyance path, provide an image forming apparatus in which a jam can be dealt with easily.

Abstract: While the electric power source is turned on, capacitor 1 is charged to a voltage EO by a direct current constant voltage supplier through transistor 4. When the electric power is disconnected, transistor 4 is switched off to discharge capacitor 1 through resistor R1. When the power source is turned on, the voltage of capacitor 1 is read by A/D converter to be produced and stored in CPU 12 memory. Then transistor 4 is switched on to charge capacitor 1 to the voltage EO. Then transistor 4 is switched off and transistor 5 is switched on to discharge capacitor 1 through resistor R2 and a counter stars. When the voltage of capacitor 1 reduces to the same voltage stored in the memory, transistor 5 is switched off to stop the counter and to obtain the counted value t2. Then transistor 4 is switched on to prepare for the next operation. The time lapse t1 after the power source being turned off is obtained by a formula (R1/R2).times.t2.

Abstract: A color image forming apparatus forms a color image by superposing images of plural colors in plane-sequential manner. In the color image forming apparatus, the amount of aberration between the detection signal for the recording medium for the first color and the horizontal synchronization signal is measured by a counter, and the start timing of image formation of the second and subsequent colors is controlled by a delay device, according to the measured amount of aberration.

Abstract: An image heating device which includes a heater; a temperature detecting element to detect a temperature of the heater; and a controller for controlling power supply to the heater, so that the temperature detected by the temperature detecting member is maintained at a predetermined temperature, and the controller controls the power supply to the heater, based on a rising speed of the temperature detected during a period from the time when the power supply to the heater is started till the time when the temperature reaches the predetermined temperature.