JPS6286373A - Image forming device - Google Patents

Abstract

PURPOSE:To comparatively simplify the constitution of an image forming device and to reduce the cost of the device by constituting the device based on a copying machine using normal toner. CONSTITUTION:For instance, a CCD unit 171 consisting of plural CCDs 174a, 174b and plural filters 175a, 175b arranged correspondingly to the CCDs 174a, 174b is arranged close to a photosensitive body and mirrors 92, 93 are rotatably arranged close to he photosensitive body. Light emitted from an optical system is guided to the CCD unit 171 through the mirrors 92, 93 and an original image is converted into electric signals by respective CCDs 174a, 174b. The colors of the original are discriminated by these electric signals. Then, the light from the optical system is guided to an image carrier by the mirrors 92, 93, developing units 121, 122 are selectively driven on the basis of the discriminating information and an erasing array is driven to form a color image corresponding to the original image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical disadvantages of the invention and its problems]

As is well known, conventional copying machines can only copy in one color even when copying an original document consisting of a plurality of colors. There is also a type of apparatus that performs copying that scans the original image and prints an image corresponding to the original image in one scan.However, this type of apparatus is expensive. Ta.

[Purpose of the invention]

The present invention has been developed in view of the above circumstances, and its object is to create an original image consisting of a plurality of colors by an image forming method using a common edge agent. J. It is an object of the present invention to provide an economically advantageous image forming apparatus that is capable of forming multicolor images in a short time and with high accuracy.

[Summary of the invention]

In the present invention, a CCD unit consisting of, for example, a plurality of CCr] and a plurality of filters provided corresponding to these CCDs is provided near a photoreceptor, and a mirror near the photoreceptor is rotatably installed. CC the light from the optical system
Each CCD of the above CCD unit
converts each original image into electrical signals, identifies the color of the original from these electrical signals, guides the light from the optical system to the image carrier using the mirror, and selects a developing device based on the primary identification information. In addition, the erasing array is operated to form a color image corresponding to the original image.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 7 and 8 schematically show an image forming apparatus of the present invention, such as a copying machine. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document.
Furthermore, a document cover 11 that can be opened and closed is provided near the document table 2.
and a work table 12 are provided. and,
The original placed on the document table 2 is placed on the document table 2 by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the bottom surface of the document table 2.
By reciprocating in the direction of arrow a, exposure scanning is performed during the reciprocation.

In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the RI tip clamp 4 is reflected by the mirror 5.6.7, passes through the variable magnification lens block 8, and is further reflected by the mirror 91. , 92, 93 and guided to the photosensitive drum 10, and an image of the document is formed on the surface of the photosensitive drum 100.

The photosensitive drum 10 rotates in the direction of the arrow C shown in the figure, and the surface is first charged by the charging device 11, and then the image is slit.] By being exposed to light, an electrostatic latent image is formed on the surface. It is formed. This electrostatic latent image is visualized by adhering the toner to it by developing devices 121 and 122, each containing, for example, red or black toner and selectively operated as required. ing.

On the other hand, the paper (transferring material) P is stored in the selected upper paper feed cassette 131, middle paper feed power [? 132 or upper paper feed cassette 133 to feed rollers 171t, 142
．． 14B and roller pair 151.152.153, the sheets are taken out one by one and passed through the paper guide path 161.162.16.
3 and is guided to a pair of resist rollers 17, and guided to a transfer section by this pair of resist rollers 17. Here, -F distribution paper cassette 131.13
2.133 is removably provided at the lower right end of the main body 1, and either one can be selected on the operation panel described later. Note that the sizes of the paper feed cassettes 131, 132, and 13g are detected by cassette size detection switches 601, 602, and 603, respectively. The cassette size detection switches 601, 602, and 603 are composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 18, and the toner images 1 to 1 on the photoreceptor drum 10 are transferred by the action of the charger 18. be done. This transferred paper P is transferred to the photosensitive drum 1 by the action of the peeling charger 19.
The transferred image is electrostatically peeled off from 0 and conveyed by conveyor bells 1 to 20, and sent to a fixing roller 21 as a fixing device installed at the end thereof, where the transferred image is fixed by passing therethrough. . Then, the paper P in the fixing device is transferred to the feed roller pair 22.
, the distribution gate 23 operated as shown by the solid line, the discharge Mo-
A tray 25 outside the main body 1 is formed by a pair of rubber plates 24. Further, after the transfer, the residual toner on the surface of the photosensitive drum 1o is removed by a cleaner 26, and the residual image is erased by a static elimination lamp 27, so that the photosensitive drum 1o returns to its initial state. Incidentally, reference numeral 29 is a cooling fan for preventing a rise in temperature within the main body 1.

On the other hand, below the copying machine main body 1, there is a multi-I that makes it possible to make double-sided copies on a single sheet of paper or to make multiple copies on the same side.
m photo units] to 28 are provided. This unit 2
8, the above-mentioned distribution is performed by a gate 23 and a pair of paper ejection rollers 24.
, a plurality of roller pairs 28b that guide the sheets taken in by the gate 23 to the stacking section 28a;
28C128d is provided. In addition, the accumulation section 2
8a is provided with a delivery roller 288 for delivering the paper temporarily stored in the stacking section 28a. This delivery roller 28e can move up and down as shown by the arrow in the figure, depending on the thickness (number of sheets) of the stored paper. Delivery roller 2
The paper sent out by 8e is passed through a pair of separation rollers 28f that separates the paper sheets one by one and sends them out to the control games 1 to 280.
will be guided to.

When performing multiple copying, this control game 1-280 is rotated in the direction of the arrow M shown in the figure to guide the paper to the resist 1-RA pair 17 via the conveying roller pair 28h and the paper guide path 28t. Ru. When double-sided copying is to be performed, as shown in the figure, the paper is guided to the reversing section 28 via a pair of transport rollers 28. When the paper is stored in the reversing section 28k, the control gate 2BQ is rotated in the downward direction of the arrow shown in the figure, and the paper sent by the transport roller pair 28j is transferred through the transport roller pair 28h1 and the paper guide path 28i. It is adapted to guide the roller pair 17.

In this embodiment, the control gate 280 is always rotated in the direction of the arrow M shown in the figure, and only multiple copying is possible.

FIG. 9 shows the operation panel 30 provided on the main body 1. 30I is a copy key for commanding the start of copying, 302
numeral keys for setting the number of copies, etc.; 309 a display section for displaying the operating status of each section and paper jams; 304 for selecting upper and lower paper feed cassettes 13 and 14; cassettes 1 to 14;
A selection key 305 displays the selected cassette from cassette 1 to a display section, 306 a magnification setting key for setting the enlargement and reduction magnification of copies in a predetermined relationship, and 307 a zoom key for steplessly setting the enlargement and reduction magnification. , 306 is a display section for displaying the set magnification, 30e is a density setting section for setting copy density, 30a, 30b.

30c and 30d are operation keys for moving a spot light source indicating the erasing position of the document, which will be described later, 30e is a position specification key for inputting the coordinate position indicated by the spot light source, and 30f
, 300 are erase range finger 9 fixed keys for specifying the erase range at designated positions, 30h is a monochrome copy setting key, 30i is a color copy setting key, and 30j is a developer 12 containing, for example, red toner! 30 is a red designation key for designating, for example, a black designation key for designating the developing device 122 containing black toner.

FIG. 10 shows an example of the drive source configuration of each drive unit of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor,
This is a motor for moving the position of the lens block 8 for zooming. Reference numeral 32 denotes a mirror motor, which connects the mirrors 5 and 6 for variable magnification.
．． 7. This is a motor for changing the distance M (optical path length) between 7 and 7. 33 is a scanning motor, and the exposure lamp 4
and a mirror 5, and a motor for moving the mirror 6.7 for document scanning.

A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming.

35s 1352 are developing motors for driving the developing rollers of the developing units 12+ and '+22. ζ 36 is a drum motor, which is a motor for driving the photosensitive drum 10 . A fixing motor 37 is a motor for driving the Mll feeding path 20, the pair of fixing rollers 21, and the pair of discharge rollers 24. 38 is a paper feed motor, and the feed roller 1
This is a motor for driving 41 to 143. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the registration roller pair 17.

40 is a fan motor, which is a motor for driving the cooling fan 29; 40+ is a roller pair 28b, 28;
Drives c, 28, d, etc. (Ruta Kinuta's motor.

FIG. 11 shows a drive mechanism for moving the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by the first carriage 411, and the mirror 6.7 is supported by the second carriage 422.
? The ridges 411 and 412 are guided by guide rails 421 and 422 and are movable in parallel in the direction of arrow a. That is, the four-phase pulse motor 33 drives the pulley 43. A timing belt (endless belt) 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. As described later, the timing belt 45 has round teeth. On the other hand, the second carriage 422 supporting the mirror 6.7
The zero guide part 46 has two guide holes spaced apart in the axial direction of the rail 422
Two pulleys 47.47 are rotatably provided, and a wire 48 is stretched between these pulleys 47.47. One end of this wire A748 is fixed to the fixed part /I9, and the other end is fixed to the fixed part 49 via the coil spring 50. Further, one end of the first carriage 7'111 is fixed to the middle part of the wire 48. Therefore, when the pulse motor 33 rotates, the first carriage 411 moves with one rotation of the belt 45, and the second carriage 422 also moves accordingly. At this time, pulley 47.47 performs the first movement of the movable pulley, so
-C second carriage 42 for first carriage 4'11
2 move in the same direction at a speed of 1/2. Furthermore, the first
The moving directions of the second carriages 411 and 412 are controlled by switching the rotational direction of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. In other words, cassette selection key 3
If the paper size specified by 04 is (px, Py) and the copy magnification specified by the magnification setting keys 306 and 307 is K, then the copyable range (x, y), [x=
Px/KJ.

It becomes "y-Py/K". This copyable range (xSy)
In the X direction, a pointer 51 provided on the back side of the document table 2
．． 52, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 41r.

The above pointers 51 and 52 are connected to the pulley 5 as shown in FIG.
4.55, and is provided on a wire 57 that is suspended via a spring 56. The pulley 55 is connected to the motor 5
This motor 5
8 is rotated according to the paper size and magnification, so that the distance between the hands 51 and 52 can be changed.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. Then, when the copy key 301 is pressed, the first
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and the carriage 411 is moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

FIG. 13 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. Main processor group 7 above
1 includes an operation panel 30 and various switches and switches, such as the cassette size detection switch 601.6 (12
a high-voltage transformer 76 that detects input from an input device 75 such as, and drives the various chargers; the static elimination lamp 27;
The blade solenoid 26a of the cleaner 26, the heater 21a1 of the fixing roller pair 21, the exposure lamp 4, and each of the motors 31 to 40.58 are controlled to perform the copying operation described above, and the spot light source 131,
Pulse motor 135, memory 140, erase array 150
, the array drive unit 160, etc., to erase unnecessary portions of the document. Furthermore, a rotary solenoid 181, a CCD unit 174, an amplifier 191, an A/D
The converter 192, DMA (direct memory access device) 193, memory . Note that a spot light source 131, a pulse motor 135, an erasing array 150,
Array drive section 160, memory 140, rotary solenoid 18LCCl') unit 174, amplifier 191, A
/D converter 192, r) MA193, memory 194 i
:L will be explained later.

” Among the nido motors 31 to 40.58.135, the motor 351.352.37.40.401 and the developing device 12
+, toner motor 77.7 that supplies toner to 122
71 is controlled by the main processor group 71 via a motor driver 78, and the motors 31 to 34.135 are controlled by the first subprocessor group 7 via a pulse motor driver 79.
The motors 36, 39, 38, 58 are controlled by the second sub-processor i1 via the pulse motor driver 80.
Controlled by 1!73. In addition, rotary solenoid 18
1 is controlled by the first sub-processor group 72. Furthermore, the exposure lamp 4 is controlled by the main processor group 71 via a lamp regulator 81, and the heater 21a is controlled by the main processor group 71 via a heater control section 82. Then, from the main processor group 71, the first. Second
Commands to drive and stop each motor are sent to the sub-processors 72 and 73, and the first. Second subprocessor! ¥72.73 to the main processor group 71 for driving each motor,
A status signal indicating a stopped state is sent.

The first sub-processor group 72 also includes motors 31 to 3.
Position information from the information sensor 83 that detects each initial position of 4.135 is input.

FIG. 14 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter abbreviated as microcomputer), which, via an input/output board 92, performs key human power detection J3 on an operation panel (not shown) and various display controls. Also, microcomputer 9
1 is expanded by input/output ports 93-96.

A high voltage i-lance 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93, and a size switch for detecting paper size and other inputs are connected to the input/output boat 94. A copy condition setting switch and other inputs are connected to the output port 95. Note that the input/output port 96 is an option.

FIG. 15 shows an example of the configuration of the first subprocess tf group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and by setting a setting value from the microcomputer 101, it counts based on the setting value,
When the count is out, a termination pulse is output to the interrupt line of the microcomputer 101. A reference clock pulse is input to the timer 102. Further, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output boats 103 and 104. The input/output boat 104 is connected to the motors 31 to 34,135 via the rotary solenoid 181 and the pulse motor driver 79. still,
The input/output capos 1 to 103 are used, for example, when outputting status signals of each pulse motor to the main processor group 71.

FIG. 16 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting the set value from 1 to 0, it counts based on it, and outputs a termination pulse when it reaches 1. This end pulse is latched by the latch circuit 113, and its output is supplied to the cutting line and input/output capo/input line of the microcomputer 111. Also, microcomputer 1
11 is connected to an input/output boat 114, and motors 36, 38, 39, and 58 are connected to this input/output boat 114 via the pulse motor driver 80.

FIG. 17 shows the control circuit of the pulse motor, and the input/output boat 121 (corresponding to the input/output boats 104 and 114 in FIGS. 15 and 16) has a pulse motor driver 122 (in FIG. 13). A pulse motor driver 123 (equivalent to the pulse motor driver 79.80) is connected to the pulse motor driver 122 (equivalent to the pulse motor driver 79.80).
6.38.39.58.135) windings A and B
, A, and B are connected.

Figure 18 shows a method of controlling the speed of a pulse motor, where (a) is the speed curve of the pulse motor, and (b) is the speed curve of the pulse motor.
The figure shows the phase switching interval. As is clear from this figure, the phase switching interval is initially long, gradually shortens, eventually becomes equal, becomes gradually longer again, and then stops. That is, this indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, tl,
12...tx indicates the time of the phase switching interval.

Next, the document image erasing means will be explained.

In FIGS. 19 and 20, a guide shaft 130 is provided in the first carriage 411 along the lamp 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 has a guide shaft 130 for marking the erasing range of the original. Spot light source 1 as a means of giving instructions
31 are movably installed. This spot light source 131 is, as shown in FIG.
The light generated by the lens 133 is irradiated onto the document table 2 as a spot light having a diameter d. What is the brightness of this light that can pass through a document G set on a document table 2 and having a thickness of, for example, about 100 yen. In addition, the spot light source 131 is connected to the guide shaft 13.
It is connected to timing bells 1 to (toothed belts) 134 arranged along the belt.

This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of a pulse motor 135 and a driven pulley 137. Therefore, the pulse motor 135
By rotating the spot light source 131, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 411. In addition, a spot light source 131 is mounted on the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side.
A position sensor 138 consisting of a microswitch is provided to detect the initial position of. For example, spot light source 13
1 is moved, the spot light source 131 first comes into contact with the position sensor 138 and the initial position is detected.

Next, with reference to FIGS. 21 to 23, a method of specifying the erasing range of the original using the sub-boxes 1 to 11!131 will be described. This spot light source 131 is moved with the light emitting element 132 turned on by operating the operation keys 30a to 30d described above. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spot light source 131 are moved in the scanning direction (arrow y direction shown in FIG. 21). Also,
When the operation keys 30a and 30c are pressed, the motor 135 is driven, and the spot light source 131 is moved in a direction perpendicular to the scanning direction (
21). The operator presses the operation key 30 while visually observing the spot light transmitted through the document G.
a to 30d to move the spotlight to, for example, 81 points on the document G shown in FIG. 22(a), and then press the position designation key 30e. Then, the coordinate position specified by this Sl is stored in the main processor group 71 shown in FIG. Similarly, when the position specifying key 30e is pressed with the spotlight moved to 82 points on the document G, the position of the 82 points is stored in the main folder +j-1\71. The position of this spoiler 1 light can be detected, for example, by counting the number of driving pulses of the pulse motor 33, 135.

After that, press the erase range designation key 3Of, as shown in Fig. 22 (
As shown in a), a rectangular area (indicated by diagonal lines) with 81.82 points as diagonal points is designated as the erasure range. Further, as shown in FIG. 22(b), if you specify points 83 and 84 on the original G and press the erase range specification key 300, S9.
The area other than the square with four diagonal points is designated as the erasing range. In this way, the erasure range specification key 30f,
When 3oo is pressed, the main processor group 71 performs the reproduction based on the specified two point positions and the copying magnification, and the memory 140 stores the high level signal 11 in the erased portion.
i I+, a [1-level signal "0"' is stored in the other portions. That is, in this memory 140, for example, the capacity in each column direction is calculated by dividing the moving distance of the spotlights 11!131 in the X direction÷ It is composed of a RAM whose position resolution is almost the same as that of the main processor group 71, and in the case of FIG. 22(a), as shown in FIG. 23(a), and In the case of FIG. 22(b), as shown in FIG. 23(b), a high level signal is stored in the address corresponding to the shaded area, and a low level signal is stored in the other addresses. There is.

In this case, the original is set with the copy side facing up, and after the erasure range is specified, it is fixed on the fixed scale 21 of the original table 2 and turned over. Therefore, as shown in FIG. 23, the information stored in the memory 140 is also actually stored inverted in the column direction.

On the other hand, as shown in FIG. 24, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section Ph. As shown in FIGS. 25 and 26, this erasing array 150 has a plurality of light shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and each light shielding cell 151 has a plurality of light shielding cells 151 arranged therein. A light emitting element 152 made of, for example, a light emitting diode is provided as shown in FIG. A lens 153 is provided to focus the light on the surface of the photosensitive drum 10.The number of light emitting elements arranged in the erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. in,
Assuming that the distance between the light emitting elements 152 is P and the number of light emitting elements 152 is N, the total length of the erasing array 150 is Q=NXP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 28, this array driving section 160 includes a shift register 161 having the same number of bits as the number of bits in the column direction of the memory 140, a store register 162 that holds the contents of this shift register 161, and a store register 162 that holds the contents of this shift register 161. The switch circuit 164 includes a plurality of switch elements 163 that are turned on and off by each output signal of the store register 162. The movable contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are It is connected to each cathode of the light emitting elements 152 constituting the array 150. The anode of each of these light emitting elements 152 is connected to the power supply Vcc through a current limiting resistor R, respectively.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 301 is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is moved in the row direction. (shown in FIG. 23), one column of data is sequentially read out. This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK.

After one column of data is transferred to the shift register 161, the charged portion of the photoreceptor drum 10 is transferred to the erase array 15.
When the value reaches 0, the main processor group 71 outputs a latch signal @l TH, and the data stored in the shift register 161 is supplied to the store register 162 in response to this signal. That is, since the erasing array 150 is disposed between the charger 11 and the exposure section [)h, the memory 14
For example, if the angle between the erasing aluminum 150 and the exposure section Ph is θ1, and the photosensitive drum 10 is rotating at each speed, the output data for one line is θ1/'
The output timing of the latch signal t-TH is controlled so that it is supplied to the store register 162 before ω.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 163 is on, and are turned off when the switch element 163 is off. Therefore, the portion behind the charged portion of the photoreceptor drum 10, where the light emitting element 152 is turned on, is neutralized, and no electrostatic latent image is formed on this neutralized portion even if it is subsequently exposed, and the original image is erased. It means that it was done. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the gist of the invention will be explained. In this invention, when the color setting key 301 of the operation panel 30 is operated to specify color copying, the mirror 93 rotates and light from the mirror 92 is guided to the C(J) unit 171. In this state, the first carriage 411 is reciprocated with respect to the document table 2, and the document image is exposed and scanned and read by the CCD unit 1-171. As shown in FIGS. 1, 2, and 3(a) and 3(b), the CCD unit 171 includes a CCD 174a on which an optical image from the mirror 92 is formed.
, 174b, and filters 175a and 175b provided on these CCDs 174a and 174b, respectively. The CCDs 174a and 174b are arranged on a substrate 173 made of a material such as ceramic, with the chips of the CCDs being arranged in parallel in close proximity (with a distance of δctlll).

The distance δC between the CCDs 174a and 174b becomes the distance δQ on the document table 2.

That is, the distance on the document table 2 +111115. is determined by the following J:. Based on the distance [a from the document table 2 to the center of the variable power lens block 8 and the distance 1b from the center of the variable power lens block 8 to the surface of the CCr) 174a and 174b, 1 / a + 1 / b − 1, /fa/b-δQ
/δ0.

The width IC of the upper &ICGD 174a, 174b corresponds to the maximum width of the document. For example, CC0174a, 17
The size of 4b is generally 1~2mm x 28mm (lo
), the distance δC is approximately 1 to 2 mm, and if the maximum document size is A3, the distance δQ is 7.5 to 15 mm (δQ−210X1 to 2/28).

As shown in FIG. 2, the mirror 93 is rotated about a fulcrum 172 by the rotary solenoid 181. As a result, the mirror 99 is set on the optical axis of the mirror 92, as shown in FIG. 1(a), or is retracted from the optical axis of the mirror 92, as shown in FIG. Therefore, the light from the mirror 92 is directly transmitted to the CCD.
The light is guided to the unit 171 or reflected by the mirror 93 and guided to the photosensitive drum 10 .

The filters 175a and 175b are made of filter glass made of a combination of gray and red, or gray and blue, for example. These filters 17
5a and 175b are CCDs 174a and 174b, respectively.
The filter may be provided on the chip, or the filter may be applied directly to the light receiving surface of the chip.

With respect to the distance δC between the CCDs 174a and 174b,
The distance δQ on the document table 2 is determined by the constant speed v of the carriage 411.
(If , then the time difference Δ may be read as 1 δci/Vo, and if the carriage 411 is driven by a pulse motor, it may be read as the number of steps corresponding to the distance δQ.

=30= Therefore, the difference in distance δC due to one skidding of the carriage 411 is calculated by the difference in time or distance m1ll.
The signal at the filter 1758, 1751) can be reduced and processed.

In the above configuration, the color copying operation will be explained. For example, when copying an original G consisting of red and black as shown in FIG. After operating 301, press the copy key 301.
When the main processor group 71 operates the main processor group 71, the control shown in FIG. 5 is performed. That is, first, step ST
1, the mirror 93 is retracted from the optical axis 1- of the mirror 92 ()
, the light from the mirror 92 is directly transmitted to the CCD] Knit 17
I am guided by 1.

In this state, the first carriage 411 is moved in a direction away from the fixed scale 21, as shown by arrow y1 in FIG. 6, and exposure scanning of the original 0 is performed. The light output from the mirror 92 during this scanning is filtered through the filter 17.
5a to the CC[1174a] and the filter 175b to the CCD 174b. The photoelectric conversion output signal of this CCD 174a is supplied to an A/D converter 192 via an amplifier 191 shown in FIG. 13, and is converted into a digital signal. This converted signal is stored in the memory 194 via the MA 193 (S
r2). Further, the photoelectric conversion output signal of the CCD 174b is also supplied to the Δ,/l) converter 192 via the amplifier 191 and converted into a digital signal. This converted signal is stored in a different storage area of the memory 194 via r) MA 193 (Sr1). and,
When the first carriage 411 reaches the position Yb shown in FIG. 6 and the scanning of the original G is completed, color identification processing of the image information stored in the memory 194 is performed in step ST4. That is, here, for example, adjustment is performed between two types of information stored in the memory 194, a black part and a red part in the original image are identified, and the memory 194
4, the positional information of the black and red parts of the original G is stored.

As this position information, for example, two storage areas are prepared in the memory 194 corresponding to the resolution of the original, and one of these storage areas contains a high level signal corresponding to the red part of the original, and other storage areas. Set a low level signal to the
In the other memory J, rear, a high level signal may be set corresponding to the black portion of the document, and a low level signal may be set for the other portions. After that, in step ST5, the mirror 93 is pulled out to the optical axis of the mirror 92, and the light from the mirror 92 passes through the mirror 93 to the photosensitive drum 1.
It leads to 0. Next, in step STs, the memory 19
Based on the position information of the red part stored in 4, erasure data of the red part is generated and stored in the memory 140.

In this state, the developing device 12 containing black toner
2 and the erasing array 150, a copying operation of the black portion of the document G is performed. That is, the first carriage 411 is moved from the position Ya shown in FIG. 6 in the direction of the arrow y1, and the exposure scan of the original is performed. Along with this, erasing data is supplied from the memory 140 to the erasing array 150, and the charges in the red portion are erased from the photoreceptor drum 10. However, as shown in FIG. 4(b), only the black portion of the original G is copied onto the original MP. Thereafter, in step S T 7, the MP on which only the black portion has been copied is again conveyed to the transfer section by the multiple copying unit 28 described above. Next, in step STa, erase data for the black portion is generated and stored in the memory 140 based on the position information of the black portion stored in the memory 194. In this state, using the developing device 121 containing red toner and the erasing array 150,
A copying operation for the red portion of the document G is performed. That is, the first carriage 411 is moved from the position Ya shown in FIG. 6 in the direction of the arrow y1 in the figure, and the original G is exposed and scanned. Along with this, erasing data is supplied from the memory 140 to the erasing array 150, and the charges in the black portion are erased from the photoreceptor drum 10. Therefore, photoreceptor drum 1
As shown in FIG. 4(C), only the red portion of the document G is formed on the surface of the document G. As shown in FIG. In synchronization with this operation, the paper P conveyed to the transfer section is fed by the multiple copying unit 28, and the image of the red portion is transferred onto the paper P. Therefore, on this paper P, a uniform pattern of red and black is formed similarly to the document G. In Part 1, this paper P goes to step ST! 1, the paper ejection roller 24
The paper is delivered to the discharge paper 25 via the paper.

In the above configuration, when the ψ color setting key 30h is operated, the normal copying operation is set, and in this state, the red designation key 30. By operating j or point designation key 30k, copying can be performed using red or black i~lunar.

According to the above embodiment, the light from the mirror 92 is arbitrarily CC-controlled using the mirror 93 set on the optical axis of the mirror 92.
r) guided to the unit 171 or the photoreceptor drum 10;
The color of the original image and its position are identified using the CCN Konichi T-171, and the developing device 121.1 is identified according to this identification information.
22, erasure array 150, and multiple copies 1/2
8 is controlled appropriately. Therefore, since an image can be formed by selectively extracting any color from a color original, it is possible to easily perform color copying. Therefore, by the CCD unit 171,
A document image can be read with high precision, and the position of a desired image can be accurately identified.

In addition, CCD units j-171, that is, CCD174a,
When scanning a document using the scanner 174b, the document image is read in one scan of the first carriage 411, so the time required for reading can be shortened, and the overall copying time can also be shortened. It is possible to shorten it.

Furthermore, since the distance between the two ccn chips is short, overrun (overstroke) of the carriage can be reduced when the second CCD chip (174b) is scanned to the edge of the document.

Furthermore, since this configuration is based on a copying machine using ordinary toner, the configuration is relatively simple and costs can be reduced.

Note that this invention is not limited to the above embodiments. For example, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 24, but as shown in FIG. It is also possible to configure the data to be erased by

Furthermore, the color and number of filters can be changed in various ways, and by increasing the number of CCDs, the number of developing devices, and the types of toner, it is possible to perform multicolor copying.

Also, as shown in FIG.
l), two CCDs 174a-, 1
The receiving line pitch (distance) 60' between 74b and 31st
As shown in the figure, it may be reduced (δC-<6
0). In this way, by reducing the pitch δC',
With automatic exposure, it is possible to eliminate differences in reading due to changes in document density.

〔Effect of the invention〕

As detailed above, according to the present invention, it is possible to form a multicolor image in a short time and with high precision from an original document containing a plurality of colorants by using an image forming method using a normal developer. , it is possible to provide an economically advantageous image forming apparatus.

[Brief explanation of drawings]

Figures 1 to 28 show an embodiment of the present invention. Figures 1(a) and 28(b) are diagrams for explaining the setting positions of the mirror, and Figure 2 shows the arrangement of the CCD unit and rotary solenoid. Diagrams for explaining the relationship, Figures 3 (a) and (b) are C
Figure 4 is a diagram to explain the configuration of the CD, Figure 4 is a diagram showing the original and copying state to explain its operation, Figure 5 is a flowchart to explain the main parts of the operation, and Figure 6 is a diagram of the carriage. 7 is an external perspective view of the image forming apparatus, FIG. 8 is a side sectional view of FIG. 7, FIG. 9 is a plan view showing the configuration of the operation panel, and FIG. 10 is a diagram for explaining the moving state. FIG. 11 is a perspective view schematically showing the drive mechanism of the optical system. FIG. 12 is a perspective view schematically showing the drive mechanism of the pointer. FIG. 13 is a perspective view showing the overall control. A configuration diagram showing the circuit,
Fig. 14 is a block diagram of the main processor group, Fig. 15 is a block diagram of the first sub-processor group, Fig. 16 is a block diagram of the second sub-processor group, and Fig. 17 is a schematic diagram showing the control circuit of the pulse motor. 18 is a diagram for explaining the speed control method of a pulse motor, FIG. 19 is a perspective view of the main part showing the spot light source, FIG. 20 is a side sectional view of the main part showing the spot light source, and FIG. 21 and 22 are plan views shown to explain the operation of specifying the erase range of a document using a spot light source, respectively. FIG. 23 is a diagram to explain the contents of the memory, and FIG. 24 is a diagram showing the arrangement of the erase array. 25 is a perspective view of only the main parts showing the relationship between the erasing array and the photosensitive drum, FIG. 26 is a front view of FIG. 25, and FIG.
Figure (a) is a side sectional view without showing the configuration of the erase array;
) is a partially cutaway front view of the erasing array, FIG. 28 is a circuit diagram showing the configuration of the array drive section, and FIG. 29 is a main part showing an example of the arrangement of the erasing array in another embodiment. The side sectional view, FIG. 30, and FIG. 31 are diagrams for explaining the structure of a CCD in another embodiment. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 92.93...Mirror, 10...Photosensitive drum, 12x, 122...Developer, 28...Multiple copying unit, 30... Operation panel, 30a to 30d...operation keys, 30e...position designation key, 30h...monochrome copy setting key, 301.
...Color copy setting key, 45...Timing belt, 71...Main processor group, 131...Spot light source, 132...Light emitting element, 133...Lens, 135...Pulse Motor, 140... Memory, 150... Erasing array, 152... Light emitting element, 1
53... Lens, 160... Array drive unit, P...
・Paper, Ph...Exposure section, 171...CCD unit, 173...Substrate, 174a, 174b-CCD,
175a. 175b... Filter, 181... Rotary solenoid. Applicant's agent Patent attorney Takehiko Suzue Figure 22 (,a
) Fig. 22 (b) Fig. 23 (a) Fig. 23 (b) Fig. 24 Fig. 29 Fig. 25 (a) (b) Fig. 27 Fig. 30 Fig. 174a Fig. 31

Claims (3)

[Claims] (1) A scanning device that optically scans a document placed on a document table; an optical system that forms an optical image obtained by the scanning device onto a charged image carrier; and the image carrier. In an image forming apparatus comprising a plurality of developing means for developing an image formed on a body and a transfer means for transferring the developed image onto a transfer material, the transfer material on which the image has been formed is transferred to the transfer means again. a conveying means for conveying; an erasing means for erasing from the image carrier an image within or outside a specified range at the time of image formation; a conversion means for converting into a signal; a setting means for setting the light from the optical system to be guided to the conversion means or to the image carrier;
The setting means guides the light of the optical system to the conversion means,
The scanning means is reciprocated to identify the color of the original image from the signal converted by the converting means, and the setting means guides the light of the optical system to the image carrier, and the setting means guides the light of the optical system to the image carrier, and the color of the original image is identified based on the identified color. An image forming apparatus comprising: a control means for selectively operating a developing means, a conveying means, and an erasing means to selectively form an original image on a transfer material. (2) The image forming apparatus according to claim 1, wherein the converting means comprises a CCD and a plurality of color filters. (3) The image forming apparatus according to claim 1, wherein the setting means includes a mirror that reflects light from a variable magnification lens block and a rotating means that rotates the mirror.