摘要:
The invention has an image forming apparatus with a deviation amount calculator for obtaining, by an arithmetic operation, by an arithmetic operation, the deviation amount between the laser beam irradiating positions for each color, under the condition that the deviation amount increases gradually according to a time lapse in at least one of the plurality of operating modes, according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color decreases gradually, and according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color is converged.
摘要:
The invention has an image forming apparatus with a deviation amount calculator for obtaining, by an arithmetic operation, by an arithmetic operation, the deviation amount between the laser beam irradiating positions for each color, under the condition that the deviation amount increases gradually according to a time lapse in at least one of the plurality of operating modes, according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color decreases gradually, and according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color is converged.
摘要:
In the case where a peripheral velocity of photosensitive drums differs from a peripheral velocity of an intermediate transfer belt, the peripheral velocity of the intermediate transfer belt or the peripheral velocity of the photosensitive drums is corrected. The velocity of the intermediate transfer belt is transiently varied in an image forming operation. Accordingly, a plurality of tonner patch patterns including toner patches are formed on the intermediate transfer belt, and the difference in peripheral velocity between the intermediate transfer belt and the photosensitive drums is estimated based on a difference between the displacements in the tonner patch patterns.
摘要:
A lateral edge of a color thermosensitive recording paper in the main scan direction is detected. An edge heating element closest to the lateral edge is specified. The distance W between the edge heating element and the lateral edge of the color thermosensitive recording paper is detected. The proportion of the distance W to the width Wt of the heating element is calculated. Recording density of the edge heating element is lowered according to the proportion. The boundary between the edge of the recording paper and the print image is blurred.
摘要:
Illumination adjustment of LEDs is carried out prior to printing to a color thermosensitive recording paper with each thermosensitive coloring layer of yellow, magenta, and cyan. A light control circuit lights on the LEDs by one line printing period upon printing to each thermosensitive coloring layer, and makes CCD line sensors use its reflected light to image lateral edge of the color thermosensitive recording paper. Consequently, the output signal from the CCD line sensors is set within the linearity.
摘要:
A thermal printing method for printing an image line by line on a recording material by driving an array of heating elements of a thermal head while transporting the recording material relative to the thermal head. Heating data for recording a subject line to print is corrected in accordance with heat accumulation amounts of the heating elements. Surface temperatures of the respective heating elements are estimated on the basis of corrected heating data. A frictional force that will be generated between the thermal head and the recording sheet on recording the subject line is calculated on the basis of the estimated surface temperatures. The heating elements start being driven to record the subject line at a time shifted by a time shifting amount from a standard time. The time shifting amount is determined depending upon the frictional force so as to eliminate influence of fluctuations in transport speed of the recording sheet on the printed image.
摘要:
A data processing apparatus for correcting heating data for a thermal head to eliminate influence of heat accumulation in the thermal head on recording density. The apparatus is comprised of a correction circuit having a subtracter for subtracting first correction data from original heating data of a subject line to print, in pixel-to-pixel correspondence; and first to Nth operation circuits provided in correspondence with first to Nth heat accumulating layers of the thermal head respectively. The first operation circuit has a register storing first heat accumulation data for one line, a multiplier for multiplying the stored first heat accumulation data by a coefficient to provide the first correction data; a multiplier for multiplying the original or the corrected heating data of the subject line by a coefficient to provide a first value for each pixel of the subject line; a multiplier for multiplying the stored first heat accumulation data by a coefficient to provide a second value for each pixel of one line; and an adder for adding the first and second values in pixel-to-pixel correspondence. A new series of first heat accumulation data is obtained from output data of the first adder, and is stored in the register in place of the previously stored first heat accumulation data. The Jth operation circuit, J being 2 to N, has the same construction as the first operation circuit, and prepares Jth heat accumulation data based on previously stored Jth and (J-1)th heat accumulation data, to provide Jth correction data based on the Jth heat accumulation data.
摘要:
In the case where a peripheral velocity of photosensitive drums differs from a peripheral velocity of an intermediate transfer belt, the peripheral velocity of the intermediate transfer belt or the peripheral velocity of the photosensitive drums is corrected. The velocity of the intermediate transfer belt is transiently varied in an image forming operation. Accordingly, a plurality of tonner patch patterns including toner patches are formed on the intermediate transfer belt, and the difference in peripheral velocity between the intermediate transfer belt and the photosensitive drums is estimated based on a difference between the displacements in the tonner patch patterns.
摘要:
Described is a conveyance apparatus that includes a first conveyance path along which a printing medium is conveyed, a first discharge port, and a second conveyance path which causes reversal of the conveyance direction of the printing medium partially exposed from the discharge port and feeds the printing medium to the first conveyance path again. The apparatus further includes an estimation unit which estimates amount of exposure of the printing medium at the discharge port, a decision unit which, when jamming of the printing medium occurs, decides a printing-medium removal method in accordance with the amount of exposure estimated, and an output unit which outputs the removal method decided.
摘要:
A color thermal printer has thermal heads for recording yellow, magenta and cyan mono-color image, respectively. An mono-color image data of each mono-color image is processed in image data processing section, and thereafter sent to the thermal head. A correction CPU for each mono-color image reads out mono-color image data at each line to calculate a transport friction fluctuation at the thermal head between recording line and a first previous line thereto. Further, the correction CPU calculates a correction of heat energy of the thermal head on the basis of all of the transport friction fluctuation of the thermal heads.