EP2592483B1 - Dispositif d'écriture, appareil de formation d'images et procédé d'écriture - Google Patents

Dispositif d'écriture, appareil de formation d'images et procédé d'écriture Download PDF

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Publication number
EP2592483B1
EP2592483B1 EP12184257.9A EP12184257A EP2592483B1 EP 2592483 B1 EP2592483 B1 EP 2592483B1 EP 12184257 A EP12184257 A EP 12184257A EP 2592483 B1 EP2592483 B1 EP 2592483B1
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EP
European Patent Office
Prior art keywords
writing
unit
image
value
image data
Prior art date
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Not-in-force
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EP12184257.9A
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German (de)
English (en)
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EP2592483A2 (fr
EP2592483A3 (fr
Inventor
Naoichi Ishikawa
Takeshi Iwasaki
Yuya Ogawa
Taro Komura
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication of EP2592483A3 publication Critical patent/EP2592483A3/fr
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Publication of EP2592483B1 publication Critical patent/EP2592483B1/fr
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
    • G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
    • G03G15/04054—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by LED arrays
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure

Definitions

  • the present invention relates to a writing device, an image forming apparatus, and a writing method.
  • a writing device that writes a latent image by irradiating a photosensitive element with light employs an LD scanning structure using a laser beam or a light-emitting-element array structure in which an LED light-emitting element is arranged in an array manner.
  • the writing device with the light-emitting-element array structure has high reliability because the writing device includes no movable portion such as a polygon mirror in the LD scanning structure. Further, the writing device with the light-emitting-element array structure requires no optical space which is scanned with a light beam in a main-scanning direction even in an image forming apparatus that prints a wide-size format such as an A0-size format.
  • the writing device with the light-emitting-element array structure may arrange an LED head in which an LED light-emitting-element array and an optical element such as a SELFOC (trademark) lens array are integrated. As a result, the entire apparatus can be downsized.
  • an LED head in which an LED light-emitting-element array and an optical element such as a SELFOC (trademark) lens array are integrated.
  • SELFOC trademark
  • a writing device with the light-emitting-element array structure requires a light-emitting-element array having a longer width than an image writing width. If the length of the light-emitting-element array is lengthened, an LED element driver IC for use is increased, so that a production yield is lowered. Further, in order to maintain writing beam array precision, it is necessary to improve parts precision. Furthermore, such a lengthened light-emitting-element array unit as a whole needs to be replaced in a case where even a single dot is damaged in the light-emitting-element array unit. To solve this problem, has been proposed a plurality of light-emitting-element array units arranged side by side in the main-scanning direction.
  • a multiple-value light-emitting-element array unit used in each of the multiple-value light-emitting-element array a unit.
  • light emission of one dot corresponds to multiple values of five bits (32 values), for example; and a light beam can be varied in 32 levels.
  • the multiple-value light-emitting-element array unit can be controlled and adjusted so as to suppress occurrence of an uneven amount of light of a white streak and a black streak at an overlapped position of the plurality of light-emitting-element array unit (uneven pitch of the light-emitting element occurring due to assembly precision of the overlapped position).
  • JP H07-212573 A relates to a resolution conversion device for a binary picture.
  • the superior resolution conversion device of a binary picture is provided by removing a problem that high resolution performance at the time of converting the resolution of the binary picture is not reflected on the converted picture and a problem that a peculiar texture is amplified in the conversion of a pseudo half tone picture in a linear interpolation method.
  • a binary multivalue conversion part converts the inputted binary picture into a multivalue picture.
  • a multivalue picture resolution conversion part conversion-processes resolution as against the converted multivalue picture by the linear interpolation method.
  • a binary processing part converts the multivalue picture after resolution conversion into the binary picture again.
  • US 2003/107754 A1 relates to an image data conversion method and apparatus which correct a difference of dot gain between output devices.
  • converting binary data for a first output device to binary data for a second output device includes the steps of: converting the binary data for the first output device to multi-value data; correcting the multi-value data so that an output density by the second output device becomes equal to an output density by the first output device; and converting the corrected multi-value data to the binary data for the second output device.
  • the user can obtain the same output result without giving consideration to a difference between output devices.
  • the invention is defined by the subject-matter of the independent claims.
  • the dependent claims are directed to advantageous embodiments.
  • a writing device receives a binary signal in accordance with image data, and writes an image based on the signal.
  • the writing device includes a multiple-value unit and a writing unit.
  • the multiple-value unit outputs a multiple-value signal based on the received binary signal.
  • the number of multiple values is an integral multiple of the binary.
  • the writing unit writes a binary image having a lager resolution than the image data based on the multiple-value signal.
  • an image forming apparatus includes the writing device mentioned above.
  • a writing method for a writing device includes: outputting a multiple-value signal based on a binary signal in accordance with image data, the multiple value being an integral multiple of the binary; and writing a binary image having a larger resolution than the image data based on the multiple-value signal.
  • FIG. 1 is a block diagram illustrating a function and a peripheral configuration provided by an image forming apparatus according to an embodiment.
  • the image forming apparatus equipped with functions illustrated in FIG. 1 is, for example, a facsimile machine, a printing apparatus (printer), a copying machine, or an MFP.
  • the image forming apparatus includes a scanning unit 100, an image processing unit 300, an engine control unit 350, an operating unit 400, a writing unit 500, and a controller unit 610; and an external terminal 650 is configured to be connected to the image forming apparatus.
  • the scanning unit 100 is a scanning unit that scans a document.
  • the image processing unit 300 includes a plurality of image processing modules 301, each of which having a different function, and generates image data for writing used by the writing unit 500 based on the document scanned by the scanning unit 100 and image data received via the controller unit 610.
  • the engine control unit 350 includes: a system control unit 302 that controls execution of a series of processes performed by each unit that constitutes the image forming apparatus; and a driving control circuit 504 that controls each driving unit in the image forming apparatus.
  • the operating unit 400 includes an operation panel 402 as an operating unit with which a key operation is performed, and an operating control circuit 404 that controls a connection between the operation panel 402 and the controller unit 610.
  • the controller unit 610 includes a memory 612 that temporarily accumulates an image, and a control modules 614, each of which having a different function.
  • the control module 614 performs, for example, an interface (I/F) control, a memory control, and the like.
  • the external terminal 650 is, for example, a PC (personal computer) or the like, and, for example, outputs image data with the resolution (pixel density) of 600 dpi to the image forming apparatus, so that the image forming apparatus forms an image with the resolution of 1200 dpi described below, for example.
  • a PC personal computer
  • FIG. 2 is a diagram illustrating a configuration of the image forming apparatus according to the present embodiment.
  • the document is conveyed between a contact sensor 2 and a white roller 3 in response to rotation of a roller 1.
  • the document while being conveyed is irradiated with an LED attached to the contact sensor 2; the reflected light thereof is imaged at the contact sensor 2; and document image information is scanned.
  • the document image imaged at a sensor 101 is converted into an electric signal; and this analog signal is amplified by an image amplifier circuit 102.
  • An AD conversion circuit 103 converts the analog image signal amplified by the image amplifier circuit 102 into a multiple-value digital image signal for each pixel.
  • the converted digital image signal is output in synchronization with a clock output from a synchronization control circuit 106; and a shading correction circuit 104 corrects distortion caused by an uneven amount of light, a stain on an exposure glass, uneven sensitivity of the sensor 101, or the like.
  • the corrected digital image information is converted into digital recording image information (image data) by an image processing circuit 105, and is then output to the image processing unit 300.
  • the system control unit 302 includes, as described above, a function for executing and controlling a series of processes.
  • the system control unit 302 transfers image data in a scan control circuit 107, the synchronization control circuit 106, the image processing unit 300, and an LED write control circuit 502, and drives a motor (not illustrated) and the like via a scanner driving unit 108 and a printer driving unit 505 operated by control of the driving control circuit 504, thereby smoothly controlling the conveyance of the scanned document and the recording sheet
  • the writing unit 500 converts the image data transferred from the image processing unit 300 in synchronization with a transfer reference clock signal in a unit of one pixel by the LED write control circuit 502, and converts the converted data into infrared light by LED heads 503_1 to 503_3, and outputs.
  • a charging device 4 is referred to as a scorotron charger with a grid that uniformly charges a photosensitive drum 5 with -1200 V.
  • a light-emitting-element array unit (LED head) 6 is formed by LEDs that are arranged in an array manner, and irradiates the photosensitive drum 5 through an SLA (SELFOC (trademark) lens array).
  • the light-emitting-element array unit (LED head) 6 corresponds to the LED heads 503_1 to 503_3 of FIG. 1 .
  • the toner adheres only on the LED light irradiation portion.
  • the recording sheet is selected from three feeding tables and a bypass, and passes under the photosensitive drum 5 at a predetermined timing with a registration roller 8 while a toner image is transferred on the recording sheet by a transfer charger 9.
  • the recording sheet is then separated from the photosensitive drum 5 by a separating charger 10; is conveyed by a conveying tank 11; and is transferred to a fixing unit 12 where the toner is fixed on the recording sheet.
  • the recording sheet having the fixed toner is carried to the front or back of the machine, and is discharged to a discharge tray 13 or 14.
  • the image data is transferred from the scanning unit 100 to the image processing unit 300, and then to the controller unit 610.
  • the image data is again transferred from the image processing unit 300 to the writing unit 500.
  • the image data is output from the external terminal 650; passes through the controller 610; and is transferred to the writing unit 500 via the image processing unit 300.
  • a flow of the image data from the image processing unit 300 to the writing unit 500 will be described next, the flow being a common image data path when copying is executed and when a printer is output.
  • the image data is transferred from the image processing unit 300 to the LED write control circuit 502 in the writing unit 500.
  • binary image data having the resolution of 600 dpi stored in the image processing unit 300 is transferred into two pixels in parallel to the LED write control circuit 502 in synchronization with a transfer reference clock signal.
  • the two pixels transferred in parallel are an odd-numbered pixel (odd) and an even-numbered pixel (even) in the main-scanning direction of the binary image data.
  • the image data transferred in two pixels in parallel is synthesized into one line image data in the LED write control circuit 502.
  • the one line image data is image data composed of all pixels in the main-scanning direction and one pixel in the sub-scanning direction in the binary image data.
  • the one line image data is then divided into three data in the LED write control circuit 502, and are transferred into the LED heads 503_1 to 503_3.
  • FIG. 3 is a diagram illustrating a configuration and a periphery of the LED write control circuit 502.
  • an image data input unit (LVDS receiver) 512 will be described.
  • the binary image data (even pixel (even), odd pixel (odd)) and a timing signal are converted from parallel signals into a serial signal by a low-voltage differential signal element LVDS driver (not illustrated), and are transferred from the image processing unit 300 to the LED write control circuit 502 with a transfer reference clock frequency.
  • the serial signal is converted into parallel signals by the LVDS receiver 512, and each of the parallel signals including PKDE, PKDO, CLKA, LSYNC_N, LGATE_N, and FGATEIPU_N is input to a function block 510_1 in an IC 510.
  • the function block 510_1 in the IC 510 stores DEOI [1:0] data in a unit of two pixels in the SRAMs 550_1 to 550_6 line by line in synchronization with a reference clock signal CLKA.
  • the function block 510_1 After storing the image data of the three lines in the SRAMs 550_1 to 550_3, the function block 510_1 reads out, while transferring the image data of the fourth line into the SRAM 550_4, other image data of the SRAMs 550_5, 550_6, and 550_1 to 550_3 in order of address; and transfers the read data to the function block 510_2 in the IC 510.
  • the function block 510_2 targets a pixel data of the first line of the SRAM 550_1 from among the transferred image data; compares the target pixel data with a pixel data in the main-scanning direction and in the sub-scanning direction that surrounds the target pixel data (around the target pixel data); converts the target pixel data from the binary into 16 values (coding); and transfers the converted data to a second image data RAM unit in the next step.
  • the function block 510_2 reads out, while transferring the image data of the fifth line to the SRAM 550_5, the image data of the SRAMs 550_6, and 550_1 to 550_4 one by one; compares a target pixel data of the second line with a pixel data in the main-scanning direction and in the sub-scanning direction that surrounds the target pixel data; codes the target pixel data from the binary into 16 values; and transfers the coded data into the second image data RAM unit in the next step.
  • the coding will be described below with reference to FIGS. 5A to 5C .
  • the binary data of the pixel in binary is 1b, and becomes 1111b when converted into 16 values.
  • the IC 510 operates the SRAMs 550_1 to 550_6 one by one, and reads out, while transferring the image data of one line, other five image data of the SRAMs that have not been transferred yet in order of address; and codes the image data as a matrix pattern that extends in the main-scanning direction and in the sub-scanning direction with respect to the target line.
  • the multiple value of sixteen when coding (multiplying) is presented only as an example, and any multiple value that is multiplied by two can be used.
  • the function block 510_2 processes the coded (multiplied) pixel data in a unit of four pixels by increasing the clock frequency; and transfers and stores the processed data in the three SRAMs (514A_1 to 514A_3) in A-group and in the three SRAMs (514B_1 to 514B_3) in B-group by SRAM address signals of ADRA [10:0] and ADRB [10:0] as SRAMDI [15:0].
  • the function block 510_2 stores, among the pixel data of the first line, the pixel data of the LED head 503_1 in the A-group SRAM 514A_1, the pixel data of the LED head 503_2 in the A-group SRAM 514A_2, and the pixel data of the LED head 503_3 in the A-group SRAM 514A_3.
  • the function block 510_2 simultaneously reads out the pixel data that have been stored one by one in the A-group three SRAMs (514A_1 to 514A_3), while transferring the next line pixel data to the B-group.
  • the function block 510_2 causes the clock frequency at reading to be twice the clock frequency at writing in order to double a writing speed by the LED head in the main-scanning direction.
  • the function block 510_2 reads out the image data so as to convert the clock frequency in order for the LED head, capable of printing out on 1200 dpi, to print out the image of which resolution (pixel density). Further, the function block 510_2 reads out the pixel data so as to make the writing frequency in the sub-scanning direction match the LED head capable of 1200 dpi.
  • a frequency of LSYNC signal that controls a start timing of writing by the LED head in a unit of one line is changed to be half.
  • the function block 510_2 converts the density (resolution) from 600 dpi to 1200 dpi in such a way that 16-value (four pixels: 4 bits) pixel data can be written by 1200 dpi on a region of the recording sheet where the binary (one pixel: 1 bit) pixel data is written by 600 dpi.
  • the function block 510_2 reads out lower two bits of each pixel from among the coded (multiplied) pixel data in the first line, and transfers the read data into field memories (FMs) 515_1 to 515_3 in the image data delaying unit.
  • FMs field memories
  • the function block 510_2 reads out the lower two bits of each 16-value data in the first reading; and retrieves upper two bits of the pixel data in the second reading. Then, the function block 510_2 transfers the image data having a double data amount in the main-scanning direction and two lines in the sub-scanning direction to the field memories 515_1 to 515_3. Note that, in the present embodiment, the IC 510 transfers the image data having two lines in the sub-scanning direction to the field memories 515_1 to 515_3 by reading out the image data twice. However, the number of transfer may be changed in accordance with transfer order of image data depending on the image transfer method of the LED heads 503_1 to 503_3.
  • the function block 510_2 writes the image data according to the number of lines set in a register 510_4 as a storing unit in the field memories 515_1 to 515_3.
  • the LED head 503_1 does not require a delaying operation because the LED head 503_1 is used as a reference of writing timing in the sub-scanning direction.
  • the function block 510_2 transfers the image data of the LED head 503_2 to the field memory 515_2 that is cascade-connected to the field memory 515_1, and the image data of the LED head 503_3 to the field memory 515_3.
  • the function block 510_2 stores the image data of the next line in the B-group SRAMs 514B_1 to 514B_3 in a similar manner to A-group while reading out the image data of the first line from the A-group SRAMs 514A_1 to 514A_3. Further, the function block 510_2 carries out overlapping between the lines by alternately carrying out reading and writing of the A-group SRAMs 514A_1 to 514A_3 and the B-group SRAMs 514B_1 to 514B_3.
  • the LED heads 503_1 to 503_3 are arranged in a "so-called" staggered manner, that is, the LED heads are arranged to extend in the main-scanning direction and mutual end portions are shifted and overlapped in the sub-scanning direction.
  • the LED head 503_2 is shifted by 17.5 mm in the sub-scanning direction and attached using the LED head 503_1 as a reference.
  • the LED head 503_2 is shifted by 17.5 mm in the sub-scanning direction with respect to the LED head 503_1 and printed.
  • the function block 510_2 reads the image data of the LED head 503_2 from the A-group SRAM 514A_2 and the B-group SRAM 514B_2, converts the clock frequency, and writes the converted data in the field memory 515_1. Then, the function block 510_2 writes the image data according to the number of lines set in the image data register 510_4 in the field memory 515_2 cascade-connected to the field memory 515_1 while reading the image data from the field memory 515_1 in order of writing. Next, the function block 510_3 reads out the image data as L2DFMO [7:0] from the field memory 515_2 in order of writing.
  • the function block 510_3 starts to read the image date after writing the image data according to the number of lines set in the register 510_4. That is, the function block 510_3 causes a delay to the image data by delaying reading time of the image data in a unit of one line. In doing so, the image data of the LED head 503_2 is caused a delay of the writing timing by 17.5 mm in the sub-scanning direction in a unit of one line.
  • the number of delay lines in the sub-scanning direction is selectable from the number of lines set in the register 510_4. That is, the number of lines to be delayed individually differs depending on parts precision and fluctuation of assembly of the LED head 503_2. However, the delay in a unit of one line can be controlled.
  • the LED head 503_3 is shifted by 0.5 mm in the sub-scanning direction and is attached using the LED head 503_1 as a reference. Therefore, when the image data output from the A-group three SRAMs (514A_1 to 514A_3) and the B-group three SRAM (514B_1 to 514B_3) are simultaneously processed and transferred to the LED head 503_3, the LED head 503_3 is shifted by 0.5 mm in sub-scanning direction with respect to the LED head 503_1 and printed.
  • the function block 510_2 reads out the image data of the LED head 503_3 from the A-group SRAM 514A_3 and the B-group SRAM 514B_3, converts the clock frequency, and write the converted data in the field memory 515_3.
  • the function block 510_3 reads out the image data as L3DFMO [7:0] from the field memory 515_3 in order of writing. In dosing so, the image data of the LED head 503_3 is caused a delay of writing timing up to 0.5 mm in the sub-scanning direction in a unit of one line.
  • the number of delay lines in the sub-scanning direction is selectable from the number of lines set in the register 510_4. That is, the number of lines to be delayed individually differs depending on the parts precision and the fluctuation of assembly of the LED head 503_3. However, the delay in a unit of one line can be controlled.
  • the function block 510_3 outputs the image data for the LED head 503_1 and the image data for the LED heads 503_2 and the LED head 503_3 via the image data delaying units 515_1 to 3 to the LED heads 503_1 to 3 via the image data output unit 519 with a control signal.
  • the function block 510_3 selects the data at both edges, and outputs. Note that the output of the image data to the LED head data may be performed by other method depending on a specification of the LED head.
  • the LED heads 503_1 to 503_3 are binary writing units having a larger resolution than the scanning unit (sensor 101 of the scanning unit 100). For example, when the resolution of the sensor 101 of the scanning unit 100 is 600 dpi, the resolution of the LED heads 503_1 to 503_3 is 1200 dpi or more, for example.
  • the function block 510_2 reads out the pixel data from SRAMs in A-group and B-group on a clock frequency that is twice that of writing; makes the read-out pixel data to be 1200 dpi and makes the LSYC signal to be a frequency that matches 1200 dpi (which is a half of 600 dpi). Therefore, the data that is input as 600 dpi is converted into data 1200 dpi so as to be written into.
  • the LED heads 503_1 to 503_3 is equipped with an amount of light correction ROM in which correction data of each LED element and correction data of each LED array chip are stored in order to correct fluctuation of the amount of light of each LED element.
  • the IC 510 reads out the amount of light correction data of the LED head 503_1 when a power source is turned on, performs serial/parallel conversion, and stores the converted data as correction data of HOSEID [7:0] in a unit of 8 bits in the amount of light correction RAM unit 516.
  • the IC 510 After storing the all correction data in the amount of light correction RAM unit 516, the IC 510 reads out the correction data from the amount of light correction RAM 516, and again transfers the read data to the LED head 503_1.
  • the IC 510 performs this operation with respect to the LED heads 503_2 and 503_3 in a similar manner one by one.
  • the LED heads 503_1 to 503_3 are configured to hold the correction data transferred from the IC 510 in its inside unless the power source is turned off.
  • the system control unit 302 sets a writing condition to the LED writing control circuit 502 by inputting a control signal LDATA [7:0], an address LADR [5:0], a latch signal VDBCS, and a P sensor pattern signal SGATE_N into the IC 510.
  • the register 510_4 is connected to the function blocks 510_1 to 3, and stores setting such as the number of delay lines input via the operating unit 400 and the system control unit 302, the lighting time (duty) and the lighting position (lighting pattern) described below.
  • a plurality of register 510_4 may be provided in accordance with a type of storing data.
  • FIG. 4 is a diagram illustrating an example of coding (multiplying) of the pixel data.
  • the function block 510_2 codes the pixel data at an overlapped portion of the LED heads 503_1 to 503_3 in a manner as illustrated in FIG. 4 .
  • the function block 510_2 causes the black image data to be "1111b” and the white image data to be "0000b" in 16 values of 1200 dpi.
  • the function block 510_2 is, other than the above two patterns, capable of coding the pixel data to be "0001b" in a case where only one dot is lightened among four dots, "0011b” in a case where two dots are lightened among the four dots, and "0111b” in a case where three dots are lightened among four dots in the pixel at the overlapping portion between the LED heads.
  • the bit array of coding is, as illustrated in FIG. 4 , from the lower bit, one data value, two data values, three data values, and four data values.
  • the function block 510_2 codes and controls the pixels of both end portions of the image output by the LED head 503 _2 in accordance with the setting of the register 510 _4 input via the operating unit 400.
  • FIG. 5A is a diagram illustrating an outline of an arrangement of the LED heads 503_1 to 503_3.
  • FIG. 5B is an enlarged view of an overlapped portion between the LED head 503_1 and the LED head 503_2 of FIG. 5A.
  • FIG. 5C is a diagram of resolution that is converted from 600 dpi to 1200 dpi.
  • FIG. 5A focusing on the overlapped portion between the LED head 503_1 and the LED head 503_2, when a grayscale image is output, a black streak occurs in the sub-scanning direction because the LED head 503_1 and the LED head 503_2 are overlapped.
  • This black streak is illustrated in FIG. 5B by density.
  • the density of a portion where a waveform is fallen becomes high because the density of adjacent images is close, and therefore the black streak occurs in appearance.
  • the transfer resolution to the LED head is caused to be an integral multiple (double, here) such as 1200 dpi, with respect to an input resolution of 600 dpi
  • the pixel at the overlapped portion between the LED heads becomes four pixels at 1200 dpi that is four times compared with the one pixel at 600 dpi, whereby the resolution is improved.
  • the image data is converted into multiple values from binary to 16 values, one data in binary becomes four data in binary, so that it becomes possible to control four pixel data value (lightening pattern) instead of controlling an overlapped correction in the slighting time (duty), or amount of light correction data of one pixel.
  • FIG. 5C illustrates a case of printing two pixels as one in four pixels at the overlapped portion. Depression of the density in the overlapped portion is reduced, and the black streak becomes less remarkable in appearance.
  • the LED head employs a specification of printing density (resolution) of 1200 dpi.
  • resolution printing density
  • the image data is moved in the main-scanning direction by writing control, and adjustment is carried out in such a way that the image data is output until the level where a black streak occurs instead of a white streak.
  • the overlapped part becomes less than one pixel, this time unevenness is made difficult to see by reducing printing of the pixel at the overlapped portion and by decreasing the density of the black streak.
  • FIGS. 6A to 6D are diagrams illustrating an example of the pixel data and lighting time (duty), and patterns.
  • the one pixel with 600 dpi is lightened during a lighting time (duty) 10% of the main scanning time.
  • the resolution (pixel density) conversion from 600 dpi to 1200 dpi the one pixel can be divided into four pixels of "two pixels in the main-scanning direction ⁇ two pixels in the sub-scanning direction".
  • the lighting time (duty) becomes 2.5% per pixel, where the lighting time (duty) of the four pixels as a total is 10%, and all pixels are equally lightened.
  • the pattern 2 illustrated in FIG. 6C is selected.
  • first pixel a first pattern for lightening an upper left pixel
  • second pixel a second pattern for lightening an upper right pixel
  • third pixel for lightening a lower left pixel
  • fourth pixel a fourth pattern for lightening a lower right pixel
  • the image forming apparatus has been exemplarily described by being applied to an MFP that has at least two of a copy function, a printer function, and a scanner function.
  • the image forming apparatus of the embodiment can be applied to any image forming apparatus such as a copying machine and a printer.
  • writing with a higher resolution than an original image can be performed.
  • a good-quality output image can easily be obtained.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimile Heads (AREA)
  • Image Processing (AREA)

Claims (7)

  1. Dispositif d'écriture qui reçoit un signal binaire conformément à des données d'image, et écrit une image sur la base du signal, comprenant :
    une unité à valeurs multiples (300) qui produit un signal à valeurs multiples basé sur le signal binaire reçu, la valeur multiple étant un multiple entier du binaire ; et
    une unité d'écriture (500) qui écrit une image binaire ayant une résolution plus grande qu'une résolution des données d'image basée sur le signal à valeurs multiples ;
    caractérisé en ce que :
    l'unité d'écriture (500) comprend une pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) dont chacune écrit une image avec une pluralité de sources de lumière, et commande un temps d'éclairage de chacune des sources de lumière, et
    agencées de telle manière que leurs parties d'extrémité mutuelles se chevauchent dans une direction de sous-balayage ; et
    l'unité à valeurs multiples (300) amène le signal à valeurs multiples correspondant à la source de lumière positionnée à une partie où la pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) se chevauchent pour être un signal basé sur une valeur stockée à l'avance dans une unité de stockage (610).
  2. Dispositif d'écriture selon la revendication 1, comprenant en outre :
    une unité de conversion de résolution (300, 610) qui convertit la résolution de telle sorte qu'une région sur une image avec un pixel indiqué par le signal binaire conformément aux données d'image correspond à une région sur une image avec une pluralité de pixels indiqués par le signal à valeurs multiples,
    dans lequel l'unité d'écriture (500) écrit une image binaire conformément à un résultat de conversion converti par l'unité de conversion de résolution (300, 610).
  3. Dispositif d'écriture selon la revendication 1 ou 2,
    dans lequel la source de lumière est en LED, et
    l'unité de stockage (610) stocke une valeur qui indique laquelle de la pluralité de sources de lumière correspondant au signal à valeurs multiples est éclairé par l'unité d'écriture (500) pour écrire une image.
  4. Dispositif d'écriture selon la revendication 1 ou 2,
    dans lequel la source de lumière est en LED, et
    l'unité de stockage (610) mémorise une valeur indiquant un temps d'éclairement de la source de lumière.
  5. Dispositif d'écriture selon la revendication 1, dans lequel
    la pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) sont configurées pour être agencées de telle sorte que leurs parties d'extrémité mutuelles se chevauchent dans une direction de sous-balayage, et
    l'unité d'écriture (500) est configurée pour
    écrire, sur la base du signal à valeurs multiples établi par l'unité à valeurs multiples (300), l'image binaire de sorte qu'une pluralité de sources de lumière correspondent à un pixel dans une région où la pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) se chevauchent et commander le temps d'éclairage de chacune des sources de lumière en modifiant respectivement un pourcentage du temps d'éclairage de chacune des sources de lumière par rapport au total des temps d'éclairage de toutes les sources de lumière qui correspondent à un pixel.
  6. Appareil de formation d'images comprenant le dispositif d'écriture selon l'une quelconque des revendications 1 à 5.
  7. Procédé d'écriture pour un dispositif d'écriture qui reçoit un signal binaire conformément à des données d'image, le procédé comprenant :
    la sortie, par une unité à valeurs multiples (300), d'un signal à valeurs multiples basé sur le signal binaire reçu, la valeur multiple étant un multiple entier du binaire ; et
    l'écriture, par une unité d'écriture (500), d'une image binaire ayant une résolution plus grande qu'une résolution des données d'image basée sur le signal à valeurs multiples ;
    caractérisé en ce que :
    chacune d'une pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) qui sont incluses dans l'unité d'écriture (500) écrit une image avec une pluralité de sources de lumière, et commande un temps d'éclairage de chacune des sources de lumière, et étant agencées de telle manière que leurs parties d'extrémité mutuelles se chevauchent dans une direction de sous-balayage ; et
    le déclenchement, par l'unité à valeurs multiples (300), du signal à valeurs multiples correspondant à la source de lumière positionnée au niveau d'une partie où la pluralité d'unités de matrice d'écriture (503_1, 503_2, 503_3) se chevauche pour être un signal basé sur une valeur stocké à l'avance dans une unité de stockage (610).
EP12184257.9A 2011-09-15 2012-09-13 Dispositif d'écriture, appareil de formation d'images et procédé d'écriture Not-in-force EP2592483B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011202400 2011-09-15
JP2012191982A JP6127414B2 (ja) 2011-09-15 2012-08-31 書込装置、画像形成装置及び書込方法

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EP2592483A2 EP2592483A2 (fr) 2013-05-15
EP2592483A3 EP2592483A3 (fr) 2016-09-28
EP2592483B1 true EP2592483B1 (fr) 2021-11-17

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JPH04371860A (ja) * 1991-06-21 1992-12-24 Ricoh Co Ltd 画像形成装置
JPH0691944A (ja) * 1992-09-17 1994-04-05 Matsushita Electric Ind Co Ltd 画像形成装置
JPH07212573A (ja) * 1994-01-13 1995-08-11 Oki Electric Ind Co Ltd ２値画像の解像度変換装置
JPH099038A (ja) * 1995-06-19 1997-01-10 Canon Inc 画像処理装置及びその方法
JPH10285359A (ja) * 1997-04-07 1998-10-23 Ricoh Co Ltd 画像形成装置
JP2001232852A (ja) * 2000-02-25 2001-08-28 Konica Corp 画像形成装置および光量調整方法ならびに光量補正方法
JP2002330282A (ja) * 2001-05-02 2002-11-15 Murata Mach Ltd 画像形成装置
JP2003179749A (ja) * 2001-12-11 2003-06-27 Fujitsu Ltd データ変換方法
JP2004017503A (ja) * 2002-06-17 2004-01-22 Ricoh Co Ltd デジタル発光素子書き込み装置
JP2004050679A (ja) * 2002-07-22 2004-02-19 Ricoh Co Ltd 光書込み装置及び画像形成装置
JP4166545B2 (ja) * 2002-10-07 2008-10-15 株式会社リコー 光書込み装置
JP3737471B2 (ja) * 2002-11-18 2006-01-18 株式会社リコー 画像処理方法および画像処理システム
JP2004216709A (ja) * 2003-01-14 2004-08-05 Ricoh Co Ltd 画像書込装置
JP4452297B2 (ja) * 2007-08-30 2010-04-21 株式会社沖データ 画像形成装置

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JP6127414B2 (ja) 2017-05-17
EP2592483A2 (fr) 2013-05-15
JP2013075514A (ja) 2013-04-25
EP2592483A3 (fr) 2016-09-28

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