Abstract: A method generates a set of color patches that can be used to characterize a color printer. An accurate reference printer model is selected. A base set of calibration patches is printed and measured. The measurements are used to generate a model that can be used to predict the color produced by the reference printer for any combination of its colorants. The base set of patches is supplemented by a set of patches chosen to reduce the maximum color error produced by using the model compared to the predictions of a reference printer model. The supplemented set of patches is used to generate a more accurate model of the printer. The supplemented set of patches is used to recalibrate other instances of the printer.

Abstract: A disclosed control device includes a first unit configured to generate image data of multiple images to be superposed one on the other to form a single image and transmit the image data. The second control unit transmits to the first control unit a horizontal sync reference signal for achieving synchronization of the images in a horizontal direction. Based on the horizontal sync reference signal, the first control unit transmits to the second control unit a transfer clock signal that indicates transmission timing of the image data and an effective area signal that indicates an effective area of the image data. The first control unit asserts the effective area signal for an effective-area-signal assertion period that occurs between two consecutive reference-signal assertion periods during which the horizontal sync reference signal is asserted.

Abstract: A test pattern containing plurality of patches recorded using small dot patterns and large dot patterns is printed. The dot sizes arranged in the patches are different between patches. Then the test patterns are read. The detection rate and average density of additional information embedded in each large dot pattern are obtained. A large dot pattern whose detection rate and average density fall within a reference range and are closest to ideal values is determined. The average density of each small dot pattern is obtained. A small dot pattern whose average density falls within a reference range and is closest to the average density of the determined large dot pattern is determined. A copy-forgery-inhibited pattern image is generated using these dot patterns and combined with a print target image.

Abstract: A delay-type phase adjusting circuit including a first variable delay circuit for receiving a reference clock signal and adding a delay to the reference clock signal, for output a phase comparator for receiving an output of the first variable delay circuit and the reference clock signal and detecting a phase difference therebetween a control circuit for generating a control signal for variably controlling a delay value of the first variable delay circuit based on a result of phase comparison by said phase comparator a second variable delay circuit for receiving an input signal and adding a delay to the input signal, for output a computation circuit for receiving a predetermined value and the control signal and variably controlling a delay value of the second variable delay circuit.

Abstract: A facsimile apparatus is disclosed that includes a register unit that registers transmission destination information in an internal address book. The register unit receives a number input at least a first time and a second time, and upon determining that a number input the first time and a number input the second time correspond to a same input number, registers the same input number as a valid facsimile number.

Abstract: An image forming method is provided for use with an ink-jet printing device which forms a dot on a recording medium by ejecting a drop of recording liquid. In the image forming method, an image in which a ground tint is embedded in one of a foreground part and a background part of an original image is formed, the ground tint indicating that copying of the original image is inhibited. A recording liquid adhesion area of the dot per unit area in the foreground part is made different from a recording liquid adhesion area of the dot per unit area in the background part.

Abstract: A facsimile device connected to a public line in parallel with an external telephone is provided. The facsimile device includes a facsimile circuit configured to send and receive image data through the public line, a voltage detector that detects a voltage of the public line, a telephone status monitoring unit configured to judge whether the external telephone closes the public line based on the voltage of the public line detected by the voltage detector and a reference voltage, a monitoring operation control unit configured to keep the telephone status monitoring unit in an inactive state until a predetermined time elapses from a time when the facsimile circuit releases the public line, and to activate the telephone status monitoring unit if the predetermined time elapses from the time when the facsimile circuit releases the public line.

Abstract: When correction data is set, a CPU 3 reads out the correction data from an EEPROM 8 through strobe signal lines STB1-N to STB4-N and supplies it as print data signals DATA3 to DATA0 to an LED driver IC 6. When the driving of an LED array 7 according to print data is instructed, the CPU 3 supplies a group selection signal to the LED array 7 through the strobe signal lines STB1-N to STB4-N. An electrophotographic printer which can realize a high speed of the operation and contribute to the improvement of the reliability is provided.

Abstract: An image forming apparatus which forms an image on a recording material, which has: a writing section to write according to the image data; an oscillator to generate a synchronized synchronizing clock signal; a spreading clock generator to spread the band of a synchronized reference clock and generate spreading clock signals; and a plurality of control circuits to control the image forming apparatus and each section of the image forming apparatus including a writing control circuit to control the writing section. More than one control circuits in the control circuits other than the writing control circuit are driven by the spreading clock signals, and the writing control circuit is driven by the synchronizing clock signal.

Abstract: A printer comprises, from upstream to downstream, a loader for articles to be printed, a printing device and transfer elements to direct sequentially the articles from the outlet of the loader to the printing device and from the printing device toward collection elements for the printed articles. The outlet drive element for the articles from the loader, has a cylinder in contact with the articles to be printed by an opening provided in a wall of the loader, and is moved by a motor common to the transfer elements. The contact between the cylinder and the articles is sequentially interrupted by an isolating device moved by a mechanical connection with the motor of the printing device.

Abstract: A fax data transmitting and receiving method using a fax data transmitting apparatus and a fax data receiving apparatus that are connected via at least two fax lines. Upon fax data transmission, first, a script to be transmitted is scanned, and fax data corresponding to the script are stored. Next, at least two available lines to transmit the fax data are secured. Thereafter, the fax data is divided, and then the fax data segments are simultaneously transmitted via the secured available lines. Upon fax data reception, first, the dialing of the fax data transmitting apparatus is replied. Then, the phone number of at least one extra available line is provided to the fax data transmitting apparatus. Thereafter, an extra available line corresponding to the phone number is provided to the fax data transmitting apparatus.

Abstract: When detecting a signal from a communication network, signal detection is performed corresponding to the characteristics of a communication apparatus of a communication partner and the characteristics of the communication network, and to prevent erroneous detection of a signal due to a voice or the like. More specifically, using a tone detection function of a modem of a communication unit, a control unit determines if a signal of at least one period has been detected in accordance with detection parameters, i.e., a frequency, a level, and an on-time and an off-time, which correspond to a tone signal to be detected and which can deal with variations in the characteristics of the signal. When a signal of at least one period has been detected, changed detection parameters are calculated and set by adding margins to the frequency, the level, and the on-time and the off-time of the detected signal, and a signal of at least one period is again detected using the newly set detection parameters.

Abstract: The invention concerns an image-forming apparatus employing a clock-generating circuit, which generates dot clock pulses utilized for an image-writing section of the image-forming apparatus. The clock-generating circuit includes a digital-delay dot clock adjusting section to generate first dot clock pulses having a predetermined number of pulses within a predetermined time interval at a constant exposing range of the image-writing section, wherein each period of the first dot clock pulses is slightly increased or reduced by changing a selection for a plurality of delayed clock pulses, which are generated by delaying clock-pulses, outputted from a reference oscillator, in slightly different delay times; and a jitter suppressing section to suppress a jitter component included in the first dot clock pulses, wherein the jitter suppressing section divides the first dot clock pulses to generate second dot clock pulses, and then, multiplies the second dot clock pulses to generate the dot clock pulses.

Abstract: An image pick-up module transmission arrangement includes a top cover holding a transparent glass above a scanning path defined therein and two racks along two opposite sides of the scanning path, two guide rails bilaterally fixedly fastened to the top cover at a bottom side of the scanning path, an image pick-up module reciprocated in the scanning path along the guide rails, the image pick-up module having pulleys revolvably supported on the guide rails and spring leaves disposed in contact with the guide rails, and a transmission shaft mounted in the image pick-up module, the transmission shaft having two gear wheels at two opposite ends meshed with the racks, the gear wheels being rotated clockwise/counter-clockwise by a power drive in the image pick-up module, causing the image pick-up module to be reciprocated in the scanning path along the guide rails.

Abstract: An interface is provided for connecting a standard telephone line and/or a standard facsimile machine with a distributive communication network interface such as a personal computer, whereby facsimile signal present on the telephone line or at the facsimile machine may be transmitted via the Internet to a remote station without the use of long distance or international telephone signal carriers. The facsimile signal may be sent or received via the network using the network, without interfering with the capability to receive and send facsimile signals in the normal manner via a standard telephone line.

Abstract: A method for adjusting scanning speed of a scanner according to the data transmission rate between the scanner and a host computer to avoid accumulation of image data in the scanner's memory buffer is disclosed. The method comprises the following steps:(1) initiating a time counter and transmitting a test data packet from the scanner to the host computer;(2) acknowledging the scanner after the test data packet is completely received by the host computer;(3) stopping the time counter and calculating the time used for transmitting the test data packet;(4) calculating a data transmission rate according to the size of the test data packet and the time used to transmit the test data packet; and(5) adjusting the scanning speed of the scanner according to the data transmission rate.

Abstract: A facsimile transmission system is applied a facsimile machine which has a store-and-forward mode in which image data related to one or a plurality of document pages are read by a reading part and temporarily stored in a memory part and thereafter transmitted to a destination by a transmitting part at an arbitrary time.

Abstract: An image forming apparatus includes an original document table for supporting an original document, an optical scanning device for scanning the original document supported by the original document table to capture an image of the original document and converting the captured image to an image data, an image forming unit for forming images on an image bearing medium according to the image data obtained by the optical scanning device, and a transmitter for transmitting a timing signal from the optical scanning device to the image forming unit. The timing signal represents a period of time required from the commencement of operation of the optical scanning device to the commencement of outputting the image data from the optical scanning device. The apparatus further includes a controller for controlling the formation of the images by synchronizing the operation of the image forming unit with the operation of the optical scanning device in response to the timing signal transmitted by the transmitter.