JPH08305136A - Image forming device - Google Patents

Abstract

PURPOSE: To reduce the cost by shortening the length, in the main scanning direction, of a line type exposure unit for writing a one-point image for a seal such as that of approval or handling with secrecy and to accurately align a two-color image. CONSTITUTION: The writing range of the line type exposure unit 12 which is used together with a deflection-scan type exposure means for writing an image in the first color to write the image in the second color is made shorter than the deflection-scan exposure width of the deflection-scan type exposure means. Then, the line type exposure unit 12 is moved in the deflecting/scanning direction of the deflection-scan type exposure means by a moving means 45, to form the image in the second color at an arbitrary position or the position in the main scanning direction of image information outputted from the line type exposure unit 12 can be finely adjusted with the position of the exposure unit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a digital copying machine, a facsimile, a printer or the like, which forms an image of two colors according to an electrophotographic process.

[0002]

2. Description of the Related Art Generally, an image forming apparatus for forming an image by an electrophotographic process is equipped with a deflection scanning type exposure means for deflecting and scanning with a polygon mirror using a laser light source or the like. Recently, there is a demand for a model that is inexpensive and capable of two-color printing. In the case of two-color printing, unlike full-color printing, the necessary information depends on black printing, and in order to perform a one-point display such as a seal such as a seal or confidential display, a color other than black (for example, red) is used. It is printed. Since the printing of the second color does not expect a fine image, the electrostatic latent image of the first color is written on the photoconductor by the deflection scanning type exposure means, and the line type exposure unit is relatively small and inexpensive. There is an image forming apparatus which forms an electrostatic latent image of the second color on a photoconductor by means of. An example of such an image forming apparatus is disclosed in Japanese Patent Application Laid-Open No. 5-309877.

[0003]

In the conventional image forming apparatus capable of two-color printing, which uses both the deflection scanning type exposure means and the line type exposure unit, the deflection scanning exposure means on the photoconductor of the deflection scanning type exposure means. A long line type exposure unit having a writing range equivalent to the width is used. Since such a line type exposure unit is mainly intended to perform a one-point display such as a stamp or a confidential display, it rarely uses the entire area and only a small part is used frequently. is there. Even in the case of a line type exposure unit, the cost becomes extremely high as the total length becomes long, and the user is burdened.

[0004]

According to the first aspect of the present invention,
1 is applied to the outer circumference of the photoconductor by the light beam emitted from the light source.
Deflection scanning type exposure means for writing an electrostatic latent image of a color, first developing means for developing the electrostatic latent image formed on the outer peripheral surface of the photoconductor by the deflection scanning type exposure means, and the deflection scanning type The writing range is set to be shorter than the deflection scanning exposure width of the exposure means on the photoconductor, and 2 is provided on the outer circumference of the photoconductor.
A line type exposure unit for writing an electrostatic latent image of a color, a second developing unit for developing the electrostatic latent image formed on the outer peripheral surface of the photoconductor by the line type exposure unit, and a movement amount control unit Moving means for moving the line type exposure unit in the deflection scanning direction of the deflection scanning type exposure means in accordance with the image area of the second color, and image information of the second color written by the line type exposure unit in the main scanning direction. The image forming apparatus is configured by moving image information moving means.

According to a second aspect of the present invention, in the first aspect of the invention, the movement amount of the line type exposure unit is adjusted according to the position of the image of the second color, and the movement amount of the line type exposure unit is adjusted. The image forming apparatus is provided with a movement amount distribution control means for finely adjusting the movement amount of image information formed by the line type exposure unit.

According to a third aspect of the invention, in the first aspect of the invention, a function information storage section for storing the function information peculiar to the line type exposure unit is provided, and the function information of the function information storage section is identified. The image forming apparatus is provided with an information identifying unit.

According to a fourth aspect of the invention, the image information moving means according to the first aspect or the movement amount distribution control means according to the second aspect is based on the function information identified by the function information identifying means according to the third aspect. The image forming apparatus controls the amount of movement of each.

[0008]

According to the first aspect of the present invention, the line type exposure unit is moved to a desired position by the moving means controlled by the movement amount control means, so that the line type exposure unit is a short and inexpensive line type exposure unit. You can write a realistic image. In addition, by moving the image output from the line type exposure unit by the image information moving unit in the main scanning direction, the image information formed by the line type exposure unit can be compared with the image information formed by the deflection scanning type exposure unit. The position can be adjusted.

According to the second aspect of the present invention, it is possible to adjust the position of the line type exposure unit and finely adjust the position of the image information to be output from the line type exposure unit in accordance with this.

According to the third aspect of the invention, it is possible to identify the function information such as the exposure density and the maximum exposure width of each line type exposure unit by the function information identifying means.

According to a fourth aspect of the present invention, the functional information such as the exposure density and the maximum exposure width of each line type exposure unit is identified by the function information identifying means, and the line type exposure unit is moved according to the identification result. The position and the position of the image information formed by the line type exposure unit can be determined.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows two colors (black / red) used as an example of the present invention.
1 shows an outline of a digital copying machine for printing. A document reading device 2 equipped with an automatic document feeder (hereinafter referred to as ADF) 1 is arranged on the upper part of the copying machine main body.
Below the document reading device 2, an electrophotographic printer unit 4 centering on a drum-shaped photosensitive member 3 is provided.

The document reading device 2 exposes and scans a document directly set on the contact glass 5 or a document conveyed and set on the contact glass 5 by the ADF 1 with an exposure lamp 6, and the reflected light thereof is mirrored. A solid-state image sensor 8 such as a CCD line sensor using the lens optical system 7.
It is read as an electric signal by forming an image on.

That is, if the copy button is pressed after inputting copy data such as the number of copies by operating the ten-key pad of the operation section (not shown), the original set on the contact glass 5 is exposed and scanned. The reading operation is started. In this case, the originals are set directly on the contact glass 5, or the originals stacked on the ADF 1 are conveyed one by one and set on the contact glass 5. At the time of this reading, the solid-state image pickup device 8 separates the original image into black / red and converts it into an electric signal which becomes image information of each color. The image information of each color read by the document reading device 2 is output to the printer unit 4 after undergoing necessary image processing in the image processing unit.

In the printer unit 4, around the photosensitive member 3, a charging charger 9, a first exposure device 10 which serves as a deflection scanning type exposure means, and a development which serves as a first developing means using black toner. Device 11, second exposure device 12 which is a line type exposure unit, developing device 13 which is a second developing means using red toner, and transfer charger 14.
And the cleaning device 15 are arranged in order.
That is, the first exposure device 10 and the second exposure device 12 are arranged so as to form latent images at different positions on the outer peripheral surface of the photoconductor 3, and the black read by the document reading device 2 side. / Among the red image information, the red image information is temporarily stored in the memory and then output to the second exposure device 12 at a timing slightly delayed from the black image information.

The image formation is performed as follows. After the outer peripheral surface of the photoconductor 3 is uniformly charged by the charging charger 9, the electrostatic latent image formed on the photoconductor 3 by the first exposure device 10 is visualized with black toner by the first developing device 11. To be imaged. In addition, the electrostatic latent image formed on the photoconductor 3 by the second exposure device 12 is transferred to the second developing device 13.
To visualize with red toner. Then, the transfer paper 18 fed from the paper feed tray 16 or the like by the paper feed roller 17 is temporarily stopped by the registration roller 19 and then the photoconductor 3
The registration roller 19 conveys the toner image to the transfer portion by the transfer charger 14 at a timing so as to coincide with the front end of the upper toner image. The transfer paper 18 is transferred by the transfer belt 20 in the transfer section. The transfer paper 18 on which the toner image on the photoconductor 3 has been transferred is conveyed to the fixing device 21 side by the conveyor belt 20, and after being subjected to a fixing process, appropriately ejected or re-conveyed and fed. In this way, a black / red two-color image is formed.

Here, the structure of the first exposure apparatus 10
The operation will be described in detail with reference to FIG. The first exposure apparatus 10 uses a semiconductor laser 22 as a light emitting source, and a laser unit 24 in which the semiconductor laser 22 and a collimator lens 23 are integrally assembled, and a cylindrical lens 25 having a curvature in the sub-scanning direction. And polygon motor 2
The polygon mirror 27 rotated at a high speed by 6, the fθ lens 28, and the reflection mirror 29 are mounted on the optical case 30 to be assembled. A dust-proof glass 31 is attached to the optical case 30 to close an opening (not shown) for emitting a beam of light toward the photoconductor 3 side. The optical case 30 is sealed by an upper cover (not shown) attached to the upper surface of the optical case 30 in order to prevent invasion of floating substances such as toner. The laser unit 24 is structured to be attached from the outside of the optical case 30.

As a result, the beam light emitted from the semiconductor laser 22 and modulated by the image information for black color is converted into a parallel beam by the collimator lens 23,
The light is sequentially incident on the respective reflecting surfaces of the polygon mirror 27 which is rotating at a high speed via the cylindrical lens 25, and is reflected by these reflecting surfaces, so that the photoconductor 3 is deflected and scanned in the main scanning direction. At this time, by passing through the fθ lens 28, the fθ characteristic is corrected so that the image forming point on the photoconductor 3 moves at a constant speed on a straight line parallel to the photoconductor axis, and the reflection mirror 2
It is deflected toward the photoconductor 3 side by 9. Since the photoconductor 3 itself rotates in the sub-scanning direction in parallel with the main scanning by the first exposure device 10, a two-dimensional latent image is formed.

Both ends of the deflection range of the polygon mirror 27 are not used for the above-mentioned optical writing, and a part of the light beam of this portion is passed through the mirror 32 and the synchronous detection sensor 3 is used.
The signal which is incident on the beam No. 3 and is output by the synchronization detection sensor 33 when receiving light is used to obtain a synchronization signal for aligning the exposure start positions of the main scanning.

Next, the structure and operation of the second exposure device 12 will be described with reference to FIGS. In FIG. 1, the second exposure apparatus 12 includes a substrate 36 holding an LED array chip 34 and an IC drive circuit 35, and a rod lens array 37 facing the LED array chip 34.
It is assembled by mounting in the housing 38.

As shown in FIG. 2, the IC driving circuit 35 includes a plurality of shift registers 39, a plurality of flip-flops 40, a gate circuit 42 provided for each of a large number of LEDs 41 included in the LED array chip 34, and It is formed by the drive transistor 43. In this case, L
When the number of EDs 41 is 1664 (corresponding to 1664 dots), one LED array chip 34 is formed by 64 LEDs 41. That is, the LED array chip 3
26 are arranged in a straight line, and each of the 26 LED array chips 34 is connected to the shift register 39 via the flip-flop 40. LED4
When the number of 1's is 1664 and the writing density is 400 dpi, the maximum exposure width of the second exposure device 12 is about 100 mm.

In the second exposure device 12, image information SDATA for forming an electrostatic latent image on the photoconductor 3 by the LED array chip 34 is input to the shift register 39,
Between the first shift register 39 and the Nth (26th) shift register 39, the shift clock SCL
The desired exposure position (dot position) of the photoconductor 3 is shifted according to K, and when the shift is completed, the latch trigger LAT
Is applied to each flip-flop 40 to temporarily hold the image information, and only the H-level image information is output from the gate circuit 42 to the drive transistor 43 for the active period of the strobe STB to supply power to the desired LED 41. To do.

The second exposure apparatus 12 as described above has a function information storage section 44 for storing function information. The function information mentioned here is a fixed value such as the exposure density or the maximum exposure width of each second exposure device 12, and if it is 8 bits, it is 256.
It is possible to store a fixed value differentiated in. Second
The image of the second color formed by the exposure device 12 is a one-point image such as a seal such as a stamp or a confidential display. Since the length of these images in the main scanning direction is short,
Writing range of the exposure device 12 of, ie, the LED 41
Is approximately 3 with respect to the deflection scanning exposure width on the photoconductor 3.
It is set to one-third or less. Accordingly, the entire length of the second exposure device 12 including the rod lens array 37 and the housing 38 is determined by the main scanning direction (axial direction) of the photoconductor 3.
The length is about one-third or less of the length.

The LED 41 is the IC drive circuit 35.
Are connected by wire bonding. Also,
Since the LED array chip 34 and the IC drive circuit 35 are housed in the housing 38 having a hermetically sealed structure, dirt due to toner or the like is prevented.

Next, the structure and operation of the moving means 45 for moving the second exposure device 12 in the deflection scanning direction of the first exposure device 10 will be described with reference to FIG.
The moving means 45 is provided with guides 46 that slidably hold the housing 38 of the second exposure device 12 in parallel with the photoconductor 3, and a forward and reverse rotatable motor 47 is driven near both ends of the guide 46. A drive pulley 48 and a driven pulley (not shown) that are driven are arranged, and a part of the wire 49 wound around the drive pulley 48 and the driven pulley is partially attached to the housing 3
It is formed by fixing to 8. Therefore,
By rotating the motor 47 in any direction by any amount, the second exposure device 12 moves in the axial direction of the photoconductor 3.

Further, the moving means 45 of the present embodiment moves the second exposure device 12 to any one of the divided regions obtained by dividing the deflection scanning exposure region on the photoconductor 3 of the first exposure device 10 into three. Three sensors 50 for distinguishing the boundaries of the divided areas are fixed to the guide 46 in order to stop them.
As these sensors 50, a transmissive photo interrupter for detecting the light shielding piece 51 included in the housing 38 of the second exposure device 12 is used. Therefore, each sensor 50
Of the second exposure device 12 by capturing the detection signal of
By determining which of the divided areas is located in the divided area and designating the rotation direction and the rotation angle of the motor 47 according to the position of the image data to be written, the second exposure device 12 moves to an arbitrary divided position.

Next, FIG. 5 shows the two colors (black / black) used in this embodiment.
The electrical system structure of the digital copying machine for red) is shown and its operation is described in detail. The document reading unit 52, the image processing unit 53, and the printer unit 4 of the document reading device 2 are sequentially connected and also connected to the system controller 54 via a bus line. The system controller 54 includes a document reading section 52 and a printer section 4.
A start signal, a sync signal, and a magnification designation signal are sent to the
The entire system is controlled by operating status signals such as t, ready, busy, stop, etc.

The operation unit 55 connected to the system controller 54 is, as shown in FIG. 6, a liquid crystal display 56 as a means for indicating an operation mode and the like, and a plurality of inputs by a ten-key pad or a touch panel for inputting operation information. And inputting operation information such as the number of prints, magnification, print start and the like input from the input unit 57 to the system controller 54. Further, the display content of the liquid crystal display 56 is the same as the system controller 5
It is switched by the information from 4.

R (red) passes through the document reading section 52, the light corresponding to the image information obtained by scanning the document at the scanning speed corresponding to the magnification specified by the print start signal sent from the system controller 54. , G (green),
B (blue) filters 58R, 58G, and 58B, and three solid-state image pickup devices (CCD image sensor) 8 that convert light incident through these filters 58R, 58G, and 58B into electric signals are provided. . 3 provided on the output side of the solid-state image sensor 8 for each color of R, G, B
A number of A / D converters 59 are connected, and a shading correction circuit 60 and a buffer memory 61 are sequentially connected to the output side of these A / D converters 59. In this configuration, the image information read by the solid-state image sensor 8 is converted into digital image data by the A / D converter 59, and is temporarily stored in the buffer memory 61 after shading correction. The buffer memory 61 outputs the synchronized image data of each color to the image processing unit 53 at the next stage.

The image processing section 53 includes a document reading section 52.
A .gamma.-correction circuit 62 is provided for changing the gradation of the image data sent from the photoconductor 3 according to the characteristics of the photoconductor 3 and the first and second developing devices 11 and 13. This γ correction circuit 6
2 is based on the information from the system controller 54
3 of "black mode", "red mode" and "black / red mode"
The correction process switches in each of the two modes. The output data of the γ correction circuit 62 is sent to the black separation / color generation circuit 63. The black separation / color generation circuit 63 follows the information from the system controller 54 (the three mode information described above) and the black image data written by the first exposure apparatus 10 and the red image data written by the second exposure apparatus 12. And are generated and output to the gradation processing circuit 64. Gradation processing circuit 64
Performs gradation correction processing according to the characteristics of the first and second developing devices 11 and 13 based on information from the system controller 54.

The information of the system controller 54 here includes, for example, "character mode", "photograph mode", "text / photograph mode", "magnification" as image processing modes. The video data output from the gradation processing circuit 64 is temporarily stored in the frame memory 65.
The memory control circuit 60 is connected to the frame memory 65 and the ROM 66, and is connected to the frame memory 65 and the ROM.
The image data is read from 66 and the black image data is output to the printer unit 4, and the red image data is output to the printer unit 4 via the memory control circuit 67 and the buffer memory 68. In this case, the buffer memory 68 temporarily stores the red image data in order to delay the output of the red image data by the distance between the writing positions of the first and second exposure devices 10 and 12, and then outputs the image data to the printer unit 4 at a timing. To do.

Further, the ROM 66 stores the information of the "secret mark pattern" and the "hatched pattern" by being coded. The memory control circuit 67 can add the information in the ROM 66 to the image data read from the frame memory 65 based on the information from the system controller 54. In addition, the memory control circuit 67
According to the information from the system controller 54, the image data in the frame memory 65 can be processed and the timing of reading can be changed. This enables processing such as mirror processing, italicization, shadowing, double copying, and rotation.

In the printer section 4, the laser driver 6
Reference numeral 9 drives the first exposure device 10 based on the black image data sent from the image processing unit 53, writes an electrostatic latent image developed with black toner on the outer periphery of the photoconductor 3, and LED
The array driver 70 drives the second exposure device 12 based on the red image data sent from the image processing unit 53 to write an electrostatic latent image developed with red toner on the outer periphery of the photoconductor 3. . At this time, the laser driver 69 and the LE
The D array driver 70 is the system controller 54.
Based on the information from the first and second exposure apparatuses 10 and 12
Change the driving method of. That is, the first exposure apparatus 1
In the case of 0, one-dot multi-value writing is performed because one dot is formed by a plurality of beam spots, and the second exposure apparatus 1
In the case of 2, one dot is formed by one spot, and therefore one dot binary writing is performed.

Further, in order to control the movement amount of the motor 47 that moves the second exposure device 12 in the main scanning direction, a motor driver 71 that drives this motor 47 is connected to the system controller 54.

By the way, the LED array driver 70 is
As shown in FIG. 7, each system controller 54
FIFO controller 72 and LED array controller 73 which receive information from the FIFO, and the FIFO connected to the FIFO controller 72.
And an O memory 74. FIFO control unit 72 and L
The ED array control unit 73 finely adjusts the exposure position of the image information and determines the exposure time based on the information from the system controller 54.

Then, the adjustment of the exposure position of the image information (hereinafter referred to as main scanning resist) will be postponed. First,
The system controller 54 shown in FIG. 5 uses the motor 47 based on the image output information input from the operation unit 55 or the image output position information obtained by checking the two-color original image by prescanning.
Is calculated, and the motor driver 71 drives the motor 47 based on the calculation result to move the second exposure apparatus 12 to a desired position. Here, since the main scanning registration accuracy of the image information output from the second exposure device 12 is determined by the minimum number of steps of the motor 47, an error of several mm is usually generated. For example, if the image of the second color is a one-point image such as a seal stamp such as a seal stamp or confidential display, relatively precise main scanning registration accuracy is not required, and thus the control of the movement amount of the motor 47 is performed. Only need be.

On the other hand, a two-color original image is read,
When an image is output, the error in the main scanning resist is large, and it is not possible to faithfully copy the original. Therefore, as a result of the system controller 54 reading the fixed value stored in the function information storage unit 44 (see FIG. 2), if the writing density of the second exposure apparatus 12 is 400 dpi, the size of one dot is It is 0.063 mm. Then, since the image exposure position can be finely adjusted in the second exposure device 12, the system controller 54 subtracts the movement amount of the motor 47 from a desired value, and the difference (error) is set as a dot. It is converted into a number and set in the FIFO control unit 72. Suppose that value is M dots.

The operation of the FIFO controller 72 will be described below with reference to the timing chart of FIG. In the figure,
PCLK is a pixel clock, PLSYNC is a main scanning synchronization signal, PLGATE is a main scanning effective area signal, and WDATA is input image data. Further, assuming that the second exposure device 12 outputs 1664 dots from the Nth dot of WDATA, the high period data of the WRES signal is written to the FIFO memory 74, and the RRES signal is output at the Mth dot from the rise of PLGATE. Is set, and RRE is performed at the (N + 1664) th dot from the next Nth dot.
The S signal may be reset and the data may be read. This data is shown in SDATA. Further, the LED array control unit 73 sets the shift clock SCLK to PLGAT.
Generate 1664 dot pulses from the rising edge of E,
After that, the latch trigger signal LAT and the strobe signal ST
B is output, and image exposure for one line is performed. This SD
The position of the image information formed by the second exposure device 12 in the main scanning direction is finely adjusted by the phase difference of M dots between ATA and SCLK.

As described above, by moving the second exposure device (line-type exposure unit) 12 to a desired position, the short and inexpensive line-type second exposure device 12 can be used as a one-point for the second color. You can write a nice image. Further, by moving the image output from the second exposure device 12 in the main scanning direction, the second exposure device 12 is applied to the image information formed by the first exposure device (deflection scanning type exposure means) 10. Since it is possible to align the positions of the image information formed by, the two-color images can be accurately overlapped. The above is the effect corresponding to the invention of claim 1. In this case, the movement amount control means for controlling the movement amount of the movement means 45, that is, the rotation angle of the motor 47 is realized by the system controller 54. The image information moving means for moving the image information in the main scanning direction in the second exposure device 12 is realized by the system controller 54 which controls the operation of the LED array driver 70.

Furthermore, instead of a one-point image,
In the case of a two-color image, the position of the second exposure device 12 (line type exposure unit) is adjusted, and the position of the image information output from the second exposure device 12 is finely adjusted in accordance with this. Therefore, the two-color image output area can be more accurately determined. This is an effect corresponding to the invention of claim 2. The movement amount of the second exposure device (line-type exposure unit) 12 is adjusted according to the position of the image of the second color, and the second exposure is performed in accordance with the movement amount of the second exposure device 12. The movement amount distribution control means for finely adjusting the movement amount of the image information formed by the device 12 is realized by the system controller 54.

Further, a function information storage section 44 (see FIG. 5) for storing the function information such as the exposure density and the maximum exposure width of the second exposure device 12 as an individual line type exposure unit is provided, and this function information is stored. Since the function information stored in the storage unit 44 is identified by the system controller 54 as the function information identifying means, the second function having different functions is used.
It is possible to perform control suitable for the exposure apparatus 12 of FIG. This is an effect corresponding to the invention of claim 3.

Further, the system controller 54 identifies the functional information such as the exposure density and the maximum exposure width of each second exposure device 12, and the moving position of the second exposure device 12 and the second exposure device 12 are determined according to the identification result. Since the position of the image information formed by the second exposure device 12 can be determined, the two-color image can be faithfully copied to the original image even if the function of the second exposure device 12 is different. . This is an effect corresponding to the invention of claim 4.

[0043]

According to the first aspect of the invention, the moving means is controlled by the moving amount control means and moves the line type exposure unit in the deflection scanning direction of the deflection scanning type exposure means in accordance with the image area of the second color. Since the image information moving means for moving the image information of the second color to be written by the line type exposure unit in the main scanning direction is provided, the line type exposure unit is moved to a desired position by the moving means controlled by the movement amount control means. This makes it possible to write a one-point image of the second color with a short and inexpensive line type exposure unit. In addition, by moving the image output from the line type exposure unit by the image information moving unit in the main scanning direction, the image information formed by the line type exposure unit can be compared with the image information formed by the deflection scanning type exposure unit. The position can be adjusted. This makes it possible to prevent color shift even in the case of a two-color image.

According to a second aspect of the present invention, in the first aspect of the invention, the movement amount of the line type exposure unit is adjusted according to the position of the image of the second color, and the movement amount of the line type exposure unit is adjusted. Since the movement amount distribution control means for finely adjusting the movement amount of the image information formed by the line type exposure unit is provided in accordance with the above, the position of the line type exposure unit is adjusted, and the line type exposure unit is adjusted accordingly. Since the position of the image information to be output can be finely adjusted, the two-color image output area can be more accurately determined.

According to a third aspect of the invention, in the first aspect of the invention, a function information storage section for storing the function information peculiar to the line type exposure unit is provided, and the function information of the function information storage section is identified. Since the information discriminating means is provided, the functional information such as the exposure density and the maximum exposure width of each line type exposure unit can be discriminated by the functional information discriminating means, which makes it suitable for the line type exposure units having different functions. Can be controlled.

According to a fourth aspect of the invention, the image information moving means according to the first aspect or the movement amount distribution control means according to the second aspect is based on the function information identified by the function information identifying means according to the third aspect. Therefore, even if the function of the second exposure device 12 is different,
The color image can be faithfully copied to the original image.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a line type exposure unit and a moving means in an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit configuration on a substrate built in a line type exposure unit.

FIG. 3 is a perspective view showing a deflection scanning type exposure means.

FIG. 4 is a vertical sectional front view showing a digital copying machine for two-color printing.

FIG. 5 is a block diagram showing an electrical system of the digital copying machine.

FIG. 6 is a plan view of an operation unit.

FIG. 7 is a circuit diagram showing an LED array drive.

FIG. 8 is a timing chart showing an output operation of image information.

[Explanation of symbols]

3 Photoreceptor 10 Deflection Scanning Exposure Means 11 First Developing Means 12 Line Type Exposure Unit 13 Second Developing Means 45 Moving Means 44 Function Information Storage Unit 54 Moving Amount Control Means, Image Information Moving Means, Moving Amount Distribution Control Means

Front page continued (72) Inventor Takashi Goto 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Hiroshi Fujiwara 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Shigeru Watanabe 1-3-6 Nakamagome, Ota-ku, Tokyo Within Ricoh Co., Ltd.

Claims (4)

[Claims] 1. A deflection scanning type exposure means for writing an electrostatic latent image of a first color on the outer periphery of a photoconductor by a beam of light emitted from a light emitting source, and an outer peripheral surface of the photoconductor formed by the deflection scanning type exposure means. A first developing unit for developing the electrostatic latent image formed on the photosensitive member and a writing range shorter than the deflection scanning exposure width of the deflection scanning type exposing unit on the photosensitive member, and a second color static image is formed on the outer periphery of the photosensitive member. A line type exposure unit for writing an electrostatic latent image, a second developing unit for developing the electrostatic latent image formed on the outer peripheral surface of the photoconductor by the line type exposure unit, and a moving amount control unit for controlling the above-mentioned 2 Moving means for moving the line type exposure unit in the deflection scanning direction of the deflection scanning type exposure means according to the image area of the color;
An image forming apparatus comprising image information moving means for moving the image information of the second color to be written by the line type exposure unit in the main scanning direction. 2. The image information formed by the line-type exposure unit while adjusting the amount of movement of the line-type exposure unit according to the position of the second-color image. The image forming apparatus according to claim 1, further comprising a movement amount distribution control unit that finely adjusts the movement amount of the image forming apparatus. 3. A function information storage unit for storing the function information unique to the line type exposure unit, and a function information identification unit for identifying the function information of the function information storage unit. The image forming apparatus described. 4. The image information moving means according to claim 1 or the movement amount distribution control means according to claim 2 determines each movement amount based on the function information identified by the function information identifying means according to claim 3. An image forming apparatus characterized by controlling.