Abstract: An inspection apparatus that handles a printed material in which an image is formed on a sheet by a pulse width modulation (PWM) signal having a pulse width according to a pixel value of each pixel of original image data, the inspection apparatus includes: a reference image generator that samples the PWM signal and generates the reference image data that serve as a criterion as a comparison target in inspection; and an inspector that inspects the printed material by comparing read image data obtained by reading the printed material and the reference image data.

Abstract: A signal processing device that generates an output signal from image data by using a clock corresponding to the pixels of the image data, the signal processing device includes: a delayed signal group generating unit that generates a group of delayed signals with a delay element group formed with stages of delay elements; a clock adjusting unit that generates a modulation/synchronization clock from the group of delayed signals by referring to phase data matching the clock with a predetermined phase and frequency modulation coefficient data converting the clock to a predetermined frequency; and a PWM processing unit that generates a PWM signal from the group of delayed signals by referring to the phase data, the frequency modulation coefficient data, the modulation/synchronization clock, and the image data, the PWM signal having a pulse width corresponding to the value of the image data.

Abstract: A signal processing device that generates an output signal from image data by using a clock corresponding to the pixels of the image data, the signal processing device includes: a delayed signal group generating unit that generates a group of delayed signals with a delay element group formed with stages of delay elements; a clock adjusting unit that generates a modulation/synchronization clock from the group of delayed signals by referring to phase data matching the clock with a predetermined phase and frequency modulation coefficient data converting the clock to a predetermined frequency; and a PWM processing unit that generates a PWM signal from the group of delayed signals by referring to the phase data, the frequency modulation coefficient data, the modulation/synchronization clock, and the image data, the PWM signal having a pulse width corresponding to the value of the image data.

Abstract: A signal processing apparatus includes a pulse signal producing section configured to produce image creating signals for image formation in response to image data by using an image processing clock corresponding to each pixel of the image data; a measuring section configured to measure a difference between an actual value and an ideal value of a signal width of the image creating signal at the time of measurement; and a processing section configured to correct the image data so as to cancel the difference at the time of an actual action.

Abstract: Provided is an image processor obtaining image data divided in packing units, comprising: a parallel processing unit performing an image conversion processing in parallel on the pixel data arranged in a sub scan direction in the packing unit, based on the obtained pixel data and the intermediate value for the pixel data, to calculate an output value after the conversion of the pixel data and an index value; an intermediate value calculating unit calculating an intermediate value based on the respective index values calculated by the parallel processing units regarding pixels within a predetermined relative position range; and a first retention unit for delaying the start of the image conversion processing to one pixel data for a delay period set to be equal to or longer than a period required for obtaining the one pixel data and calculating the intermediate value for the one pixel data.

Abstract: A signal processing apparatus includes a pulse signal producing section configured to produce image creating signals for image formation in response to image data by using an image processing clock corresponding to each pixel of the image data; a measuring section configured to measure a difference between an actual value and an ideal value of a signal width of the image creating signal at the time of measurement; and a processing section configured to correct the image data so as to cancel the difference at the time of an actual action.

Abstract: Provided is an image processor obtaining image data divided in packing units, comprising: a parallel processing unit performing an image conversion processing in parallel on the pixel data arranged in a sub scan direction in the packing unit, based on the obtained pixel data and the intermediate value for the pixel data, to calculate an output value after the conversion of the pixel data and an index value; an intermediate value calculating unit calculating an intermediate value based on the respective index values calculated by the parallel processing units regarding pixels within a predetermined relative position range; and a first retention unit for delaying the start of the image conversion processing to one pixel data for a delay period set to be equal to or longer than a period required for obtaining the one pixel data and calculating the intermediate value for the one pixel data.

Abstract: An management system of an image forming device, which is structured by the image forming device and a management device for managing the image forming device through a communication network; the management device comprising a communication unit for sending a data of a computing parameter for conducting an image processing and a data of a set value indicating a computing procedure of the image processing, to the image forming device; the image forming device comprising: an image processing circuit for conducting the predetermined image processing for an image data; and an operating frequency measurement unit for measuring an operating frequency of the image processing circuit; wherein the image forming device conducts an operating test of the image processing circuit by the operating frequency measurement unit on the basis of the sent data, and sends a test result of the operating test to the management device.

Abstract: An management system of an image forming device, which is structured by the image forming device and a management device for managing the image forming device through a communication network; the management device comprising a communication unit for sending a data of a computing parameter for conducting an image processing and a data of a set value indicating a computing procedure of the image processing, to the image forming device; the image forming device comprising: an image processing circuit for conducting the predetermined image processing for an image data; and an operating frequency measurement unit for measuring an operating frequency of the image processing circuit; wherein the image forming device conducts an operating test of the image processing circuit by the operating frequency measurement unit on the basis of the sent data, and sends a test result of the operating test to the management device.

Abstract: An image forming apparatus includes: a pattern generator for generating pattern data for recording a set of test patterns at respective specified positions thereof on the recording sheet; a positional deviation detector for detecting a positional deviation at each characteristic point included in the set of test patterns generated by the pattern generator, in the image data read from the recording sheet on which the image containing the set of test patterns has been formed, by comparing with a position of the proper output at each characteristic point; and a deviation correcting device for calculating operational values for a correction of each pixel with reference to the respective positional deviations of the characteristic points detected by the positional deviation detector and for carrying out a processing to eliminate the positional deviation of each pixel at the time of image formation by using the operational values.

Abstract: An image forming apparatus includes: a pattern generator for generating pattern data for recording a set of test patterns at respective specified positions thereof on the recording sheet; a positional deviation detector for detecting a positional deviation at each characteristic point included in the set of test patterns generated by the pattern generator, in the image data read from the recording sheet on which the image containing the set of test patterns has been formed, by comparing with a position of the proper output at each characteristic point; and a deviation correcting device for calculating operational values for a correction of each pixel with reference to the respective positional deviations of the characteristic points detected by the positional deviation detector and for carrying out a processing to eliminate the positional deviation of each pixel at the time of image formation by using the operational values.

Abstract: An image forming device scans in a main scanning direction in synchronization with dot clock pulses for each scanning line to form an image; a basic clock pulse generator generates basic clock pulses with a predetermined interval; a delayed clock pulse generator generates a group of plural delayed clock pulses having different phases respectively; a synchronism detector detects at least two delayed clock pulses synchronizing with an index signal from the plural delayed clock pulses; a calculating section calculates a number of delay stages existing within a given time period based on the two synchronizing delayed clock pulses; and a clock pulse controller selects delayed clock pulses sequentially delayed from the synchronizing delayed clock pulse within a predetermined time period based on the calculated number of delay stages to control a number of clock pulses outputted as the dot clock pulses during the predetermined time period.

Abstract: In an apparatus for forming multi-color image provided with a rotatable image carrying member and a plurality of image forming means each having a charging device, a scanning exposure device and a developing device; each scanning exposure device includes a beam generator and a polygonal mirror. The apparatus is further provided with a first sensor for detecting the beam passing at a start reference position on a peripheral surface of the rotatable image carrying member and for outputting a start reference signal; a second sensor for detecting the beam passing at an end reference position on the peripheral surface and for outputting a stop reference signal; and a controller to measure a time between the start reference signal and the stop reference signal and to control a frequency of clock pulses to transmit image signals for each scanning exposure device on the basis of the measured time of each scanning exposure device.

Abstract: A delay signal generating apparatus incorporated in an integral circuit, includes a plurality of serially-connected delay elements for delaying an input signal successively and for outputting plural delay signals, a heat generating circuit for heating the plurality of delay elements, and a heat controller for controlling a heat amount generated by the heat generating circuit so as to change the delay time of each of the plural delay signals.

Abstract: In a circuit provided in a single integrated circuit unit for use in a signal delay device, there is provided with a device in which an input signal is delayed and a plurality of delay signals, each having a different delay period from the input signal, are outputted, and a detector in which a delay signal having a specific relation with the input signal among the plurality of delay signals is detected.

Abstract: In a circuit provided in a single integrated circuit unit for use in a signal delay device, there is provided with a device in which an input signal is delayed and a plurality of delay signals, each having a different delay period from the input signal, are outputted, and a detector in which a delay signal having a specific relation with the input signal among the plurality of delay signals is detected.

Abstract: A motor speed control device for use in an image forming apparatus with a differential phase detection circuit for outputting differential phase data between the clock pulse and a frequency proportional signal representative of the motor speed and a differential speed detecting circuit for outputting differential speed data between the length of the clock signal and the length of the speed signal. A pulse width modulated signal obtained from the two signals controls the speed of the motor.