JPS61122671A - Picture forming device - Google Patents

Abstract

PURPOSE:To erase the optional part of an original picture with a simple constitution to from a picture by irradiating light to a photosensitive drum is accordance with an erasing range specified by spot light and erasing an electrostatic latent image or electrostatic charge. CONSTITUTION:A guide shaft 130 is arranged on the part of a carriage 411 which is shielded from the light of a lamp 4 along the lamp 4 and a spot light source 131 to be a means for indicating the erasing range of an original is movably fitted to the guide shaft 130. The electrostatic charge of the erasing range of the original specified by the spot light source 131 is erased at the formation of an image. At the specification of the erasing range, the copying surface of the original is turned upwards and set up on the 2nd fixing scale side of an original board 2. At the copying of the original, the original is turned upside-down and set up on the 1st fixing scale side.

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 background of the invention and its problems]

In general, an electronic copying machine has the function of copying an original image directly onto paper, or of enlarging or reducing the original image and making a copy.

By the way, there may be unnecessary parts in the original image. However, conventional copying machines cannot selectively erase and copy original images.

[Purpose of the invention]

This invention was made based on the above circumstances, and its purpose is to form an image by erasing any part of a document image with a simple configuration, and to provide an image with excellent operability. The present invention aims to provide an image forming apparatus.

[Summary of the invention]

For example, this invention shines a spotlight on an original image.
This method moves this spot light to specify an erasing range, and irradiates the photoreceptor drum with light corresponding to the specified erasing range to erase the electrostatic latent image or charge and form an image. Especially when specifying the area to be erased, place the original on the second fixed scale side of the document table with the copy side facing up.
After this, when copying is to be performed, the original is turned over and set on the first fixed scale side.

[Embodiments of the invention]

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

FIGS. 14 and 15 schematically show an image forming apparatus, such as a copying machine, according to the present invention. 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. This manuscript table 2
At both longitudinal ends of @1. A second fixed scale '1*'l is provided. Further, near the document table 2, there is a document cover 11 that can be opened and closed, and a work table 1. is provided. The original set on the original platen 2 is moved by an optical system consisting of an exposure lamp 4 and mirrors 5, 6.7 against the lower surface of the original platen 2 in the direction of arrow a. Exposure scanning is performed during reciprocation. In this case, mirror 6.7
moves at the speed of the mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the exposure lamp 4, is reflected by the mirrors 5, 6, and 7, passes through the variable magnification lens block 8, and then passes through the mirror 9. The light is reflected by the photoreceptor drum 10 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 100.

The photosensitive drum 10 rotates in the direction of arrow C, and its surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. is made visible by applying toner by the developing device 12. On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the feed roller 15 or 16, and the paper guide path 17
Alternatively, the recording medium is guided through the recording medium 18 to a pair of registration rollers 19, and sent to a transfer section by the pair of rollers 19. Here, each of the paper feed cassettes 13 and 14 is
It is detachably 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 each of the paper feed cassettes 13 and 14 has a cassette size detection switch 60K, 60.
The cassette size is detected by This detection switch 601.60. is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

- 10,000, the paper P sent to the transfer section is transferred to the transfer charger 200.
By coming into close contact with the surface of the photoreceptor drum 100,
The toner image on the photoreceptor drum 10 is transferred by the action of the charger 200 described above. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the terminal end of the conveyor belt 22. By passing through this, the transferred image is fixed. Then, the paper P after fixing is
The paper is discharged onto a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. In addition, 1. After the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, the residual toner on the surface is removed by the cleaner 27, and the afterimage is erased by the charge removal lamp 28, so that it returns to its initial state. It has become. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 16 shows the operation knob 30 provided on the main body. 301 is a copy key for instructing the start of copying;
0. 303 is a numeric keypad for setting the number of copies, etc.; 303 is a display unit that displays the operating status of each part and paper jams;
0. is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 30. 306 is a magnification setting key for setting the enlargement/reduction magnification of copying in a predetermined relationship; 30a is a zoom key for steplessly setting the enlargement/reduction magnification; and 30s is a set key. The display section for displaying the magnification, 3σ, is the density setting section for setting the copy density, J (7, 30b, 30o, 30 .
1 is an operation key that moves the spot light source that indicates the erasure position of the draft, which will be described later. 30@ is a position specification key that manually inputs the coordinate position indicated by the spot light source. 301.30g is each a key that specifies the erasure range at the specified position. This is the erase range specification key.

FIG. 17 shows an example of the configuration of a drive source for each drive section of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for changing the magnification. Reference numeral 32 denotes a mirror tanabata, which is a motor for changing the distance (optical path length) between the mirror 5 and the mirrors 6 and 7 for zooming. 3
3 is a scanning motor which connects the above-mentioned happy light lamp 4 and mirror 5. This is a motor for moving the mirror 6.7 for scanning the original. 34 is the shutter motor,
This 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. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. A drum motor 36 is a motor for driving the photosensitive drum 10. A fixing motor 37 is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. A paper feeding motor 38 is a motor for driving the delivery rollers 15 and 16. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 18 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by the first carriage 41□, and the mirror 6.7 is supported by the second carriage 4'2, respectively, and these carriages 411 and 418 are supported by the guide rails 42□, 42. It is guided by and can freely move in parallel in the direction of arrow a. That is, the four-phase Luss motor 33 drives the pulley 43'.

An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of the first belt 4, which supports the mirror 5, is fixed to the middle of the belt 45.

On the other hand, the rail 42. of the second carriage 41□ supports the mirror 6.7. The guide portion 46 of the rail 42. tcry ear 48 between two pulleys 47 degrees 47 spaced apart in the axial direction of
is being handed over. One end of this wire 48 is a fixed part 49
The other end is connected to the fixing part 4 via a coil spring 50.
9, respectively. Further, since one end of the first carriage 411 is fixed to the middle part of the wire 48, when the pulse motor 33 rotates, the belt 45 rotates and the first carriage 411 moves. second carriage 41. also move. At this time, since the pulleys 47, 47 act as movable pulleys,
The second carriage 4 moves in the same direction at a speed of A relative to the 1st carriage 4. In addition, 1. Second carriage 4゛1□, 41. The movement of the motor 330 is controlled by switching the direction of rotation of the arm motor 330.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, if the paper size specified by the paper selection key 304 is (Px, py) and the copy magnification specified by the magnification setting key 306.30° is K, then the copyable range (x, y) is x= Px/K y == p, /K. Of this copyable range (x, y), the X direction is indicated by the pointers 51° 52 provided on the back of the document table 2, and the y direction is indicated by the pointers 51° 52 provided on the top surface of the first cabinet 4. The scale 53 shown in FIG.

As shown in FIG. 19, the above-mentioned pointers 51 and 52
．． 55 via a spring 56.

The pulley 55 is rotated by a motor 58, and by driving the motor 58 according to the paper size and magnification, the distance between the guides 61 and 52 can be changed. There is.

In addition, the first carriage 41. is moved to a predetermined position (home position according to the magnification) by driving a motor 33 according to the paper size and magnification. And copy key 30. When is pressed, the first
The carriage 411 is first moved in the direction of the second carriage 41. Then, the landing gear 4 is turned on and the carriage 411 is moved toward the second carriage 41. is moved in the direction away from.

When scanning of the original is completed, the lamp 4 is turned off and the first lamp is turned off.
The carriage 41□ is returned to the home position.

FIG. 20 shows the overall control circuit, in which the main processor group 11 and the first . 2nd subderosezosa group 72.73
It is mainly composed of. The main processor group 71 detects inputs from input devices 75 such as the operation panel 30 and various switches and sensors, such as the cassette size detection switches 60 and 602, and a high voltage transformer 26 that drives each of the chargers. The static elimination run f28, the blade solenoid 27a of the cleaner 27, and the heater 23a of the fixing roller pair 23.

The exposure land 4 and each of the motors 30 to 40.5
8 etc. to perform the above-mentioned copying operation,
The spot light source 131, pulse motor 135, erasing array 150, array drive section 160, memory 140, etc. are controlled to erase unnecessary portions of the document. In addition, a spot light source 13, a pulse motor 135. Erase array 1
50, array driver 160, and memory 140 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． 40 and a toner 7 for supplying toner to the developing device 12
7 is controlled by the main processor group 71 via a motor driver 78, motors 31-34 and 135 are controlled by the first sub-processor group 72 via a pulse motor driver 79, and motors 36, 39, 38, 58 is controlled by the second sub-processor group 73 via the motor driver 801ff. Further, the exposure land 4 is connected to the main processor group 71 via the lamp regulator 81.
The heater 23a is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71, the first. Second sub-processor group 72
Commands to drive and stop each motor are sent to the first motor.
A status indicating the drive/stop state of each motor is sent from the second processor group 72, 73 to the main processor group 7. In addition, the first sub-processor group 72 includes each initial position i11 of the motors 31 to 34! The position information of the position sensor 83 force i that detects the position is inputted.

FIG. 21 shows an example of the configuration of the main processor group 71. That is, numeral 91 is a one-chip microco/peater (hereinafter simply referred to as microcomputer) which detects human input from keys on an operation panel (not shown) and controls various displays through an input/output port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96.

The high voltage transformer 76, motor driver 78, rung regulator 81, and other outputs are connected to the human output port 93, and the human output port 94 is connected to a size switch for detecting the size of workpiece and other human power. A copy condition setting switch and other human power are connected to the port 95. Note that the human output port 96 is an option.

FIG. 22 shows an example of the configuration of the first sub-processor group 72. In other words, 101 is a microcomputer and is connected to the main processor group 7. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor; when a set value is set from the microcomputer 101, it counts based on it; and when it has counted out, the end pulse is sent to the microcomputer 10.
Output to interrupt line 1. The timer 102 is manually supplied with a reference clock pulse. Also, microcontroller 10
The position information from the position sensor 83 is manually input to the human output port 103.1. i04 is back connected.

The input/output port 104 is connected to the motors 31 to 34, 135 through the motor driver 79. Note that the human outputs 1 to J o z are each ! It is used, for example, when outputting a status signal of the motor to the main processor group 71.

FIG. 23 shows an example of the configuration of the sub-processor group 13 shown in FIG. That is, 111 is a microcomputer and is connected to the main processor group 7. Reference numeral 112 is a programmable inter/9 timer for controlling the phase switching interval time of the arm motor, and when the set value is received from the microcomputer 11.1, it counts based on it, and when it counts out, it starts the end time. Outputs 9 russ. This termination signal is latched by the latch circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line.

Further, a human output port 114 is connected to the microcomputer 111, and a motor 36, 38, 39, 5 is connected to this human output port 114 via the Noculus motor driver 80.
8 are connected.

Fig. 24 shows the control circuit of the Norsors motor dryer 1.
22 (Figure 20 +7) Pulse motor driver 79.8
0) is connected, and this pulse motor driver 12
2, pulse motors 123 (said pulse motor 3) to 34
゜36.38.39) each winding A , A ,
B.

Hundreds are connected.

Figure 25 shows the speed control method of a pulse motor.
(,) The figure is the speed curve of the armature motor, and (b)
The figure shows the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually shorten, eventually become equal intervals, gradually become longer again, and then stop. That is, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, t□.

t, . . . tx indicate the time of the phase switching interval.

Next, the main parts of this invention will be explained. Figures 1 and 2
In the figure, a guide shaft 130 is provided on the first carriage 41□ along the lamp 4 in a portion where the light of the lamp 4 is blocked, and this guide shaft 130' has a means for indicating the erasing range of the document. A spot light source 131 is movably provided. As shown in FIG. 2, this spot light source 131 consists of light emitting elements 132 and 133, such as light emitting diodes and lamps, which are provided opposite to the document table 2. The light generated by the light emitting element 132 is transmitted through a lens 133. , the document table 2 is irradiated with a spot light having a diameter d. This spot light has a brightness that allows it to pass through the document G set on the document table 2, which is, for example, as thick as a postcard. In addition, the spot light source 131
is connected to a timing belt (toothed belt) 134 disposed over the guide shaft 130. This timing 134 is applied to a pulley 136 provided on the rotating shaft of the pulse motor 350 and a driven pulley 137. Therefore, by rotating the pulse motor 35, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 41□. In addition, the guide shaft 13
A position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131 is provided on the first cylinder 41 □ located at the end of the main pulse motor 135. In this case, first, the spot light source 131 comes into contact with the position sensor 38 and the initial position is detected.

Next, using FIGS. 3 to 6, the spot light source 13
A method of specifying the erasing range of a document using 1 will be explained. When specifying this erasing range, the document G is placed on the second fixed scale 2! with the copy side facing upward, as shown in FIG.
is set in G-v. At this time, the first carriage 4
1° is stopped at a position indicating a copyable range corresponding to a predetermined copying magnification. Also, 1st. Second fixed scale 21. The dimension W between 21 is generally somewhat larger depending on the maximum original size.

For example, if the maximum original size is 'gA3, the long side of this original is 420m, so the first. 2nd fixed scale 2□
, 22 is W=420+α. If the manuscript is A4, it is half of A3, so
When the long side of the four originals is t, =210, the dimension W is set as W=2t0+α.

In this state, the operation keys 30. ~30,I
When Y is operated, spot light source 13 is moved. That is, the operation keys 30b, 30,1t (when pressed, the motor 33 is driven and the first barrel 411 and the spot light source 131 are moved in the scanning direction (arrow y direction shown in FIG. 3). 30a130c, the motor 135 is driven and the spot light source 131 is moved in the direction perpendicular to the scanning direction (in the direction of arrow X shown in FIG. 3). By operating the operation keys 30. to 30,1, for example, press the position designation key 30e'l while moving the spotlight to 88 points on the document G shown in FIG. 4(a).

Then, the coordinate position specified by this Si is stored in the main processor group 71 shown in FIG.

Similarly, with the spotlight moved to 81 points on the document G, press the position designation key 30sl'If: S.

The position of the point is stored in the main processor group 21. The position of this spot light can be detected, for example, by counting the number of driving i4 pulses of the pulse motor 33.135. After this, if you press the erase range specification key 30f,
As shown in FIG. 4(,), a rectangular area (indicated by diagonal lines) having the St point as a diagonal point is designated as the erasing range.

Further, as shown in FIG. 4(b), specify the S8 point +84 point of the original G, and press the erase range specifying key 30. Press SS+8
The area other than the square with four diagonal points is designated as the erasing range. In this way, the original G with the erase range specified
is turned over in the y direction as shown in Figure 5 during copying, and the first
It is set along the fixed scale 21.

When the erase range designation keys 301 and 30g are pressed, the main processor group 71 performs calculations based on the positions of the two specified points, and a high level signal "" is stored in the memory 140 in the erase range area. 1'', and a low level signal ``'0'' is stored in the other portions. That is, in this memory 140, for example, the capacity in each column direction is approximately equal to the moving distance in the X direction of the spot light source 131 divided by the position resolution in the In the case of FIG. 4(a), as shown in FIG. 6(,), and , in the case of FIG. 4(b), as shown in FIG. 6(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. . In this case, as mentioned above, when copying, the original is turned over and set on the first fixed scale 21, so the designated erasing range is
The position in the y direction is rotated around the center in the y direction. Therefore, the y-direction storage addresses of high level signals and low level signals are also converted accordingly, and predetermined signals are stored in accordance with the converted addresses.

On the other hand, as shown in FIG. 7, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 1 and the exposure section ph. This erase array 1
50, as shown in FIGS. 8, 9, and 9, a plurality of light shielding cells 151 are arranged in a direction perpendicular to the rotation direction of the photoreceptor drum 100, and inside each of the cells 151, as shown in FIG. ), (b), a light emitting element 152 made of, for example, a light emitting diode is provided.

Furthermore, a light emitting element 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 . The number of light emitting elements arranged in this erase play 150 is matched with the capacity of the memory 1400 in the column direction, for example. Here, if the distance between the light emitting elements 152 is P and the number 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. 11, this array driving section 160 includes a shift register 161 which has the same number of bits YV as the number of bits in the column direction of the memory 1400, and a store register 16 in which the contents of this shift register 161 are held.
2. It is constituted by a switch circuit 164 consisting of a plurality of switch elements 163 that are controlled on and off by each output signal of the store register 162. The movable contacts 163& of these switch elements 163 are grounded, and the fixed contacts 163b are connected to each cathode of a light emitting element (light emitting diode) 152 constituting the erase play 150, respectively. The anodes of each of these light emitting elements 152 are connected to the power supply vCC through current limiting resistors Rt.

After specifying the erasing range of the original as described above, turning the original over and setting it on the first fixed scale 2□, close the original cover 1□ and press the copy key 301ft, the first carriage 411 First, as shown in Figure 12,
The erase range specification end position D1 is moved in the direction of the first fixed scale 21. After this, the first carriage 41. is the first
It is moved in a direction away from the fixed scale 2□, and the photosensitive drum 10 is operated accordingly.

Further, when these are operated, data for one column is read out from the memory 140 in the row direction (shown in FIG. 6). This read data D1 is as shown in FIG.
The signal is transferred to the shift register 16 of the play drive unit 160 in response to the clock signal CLK. shift register 161
When the charged portion of the photosensitive drum 10 reaches the erase array 150 after one column of data has been transferred, the main processor group 71 outputs a latch signal LTH.
The contents of shift register 161 are supplied to store register 162 in response to this signal. That is, erase array 150
is arranged between the charger 11 and the exposure section ph, so one column of data output from the memory 140 is
For example, if the angle between the erasing array 150 and the exposure section ph is θ□, and the photosensitive drum 10 is rotating at an angular velocity ω, a latch signal is supplied to the store register 162 before θ, /ω. The output timing of LTH is controlled. Further, each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. That is, when the output signal of the store register 162 is at a high level, it is turned on, and when it is at a low level, it is turned off. As a result, each switch element 1
The light emitting element 152 connected to 63VC is the switch element 16
3 is on, it is lit, and when it is off, it is off. Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, the data in the memory 40 is read out one column at a time in the same manner, and the image is erased.

When such copying operation is completed, the first carriage 4 is moved to the position indicating the image forming range, as shown in FIG.
will be stopped.

According to the above embodiment, it is possible to specify and erase unnecessary portions of a document, which is convenient for editing a copy image.

Also, the second scale 2. Since the handling of the original is natural, specifying the erasing range on the side and setting the original upside down on the 1st scale '2□ side, copying is possible. This prevents mistakes in setting documents and has excellent operability.

Furthermore, when specifying the erasure range, set the copy side of the original as the front in fg, complement 2, and specify while visually viewing the original using a spot light that passes through the original. It is simple and allows easy confirmation of the erased range.

Furthermore, since the spot light source 131 is provided in the first carriage 41□, space can be used effectively and it is possible to suppress the increase in size of the apparatus.

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 between the charger 11 and the exposure section ph shown in FIG. It is also possible to configure the electrostatic latent image to be erased according to a designation.

Furthermore, the capacity of the memory 140 can also be changed as required.

It is a matter of the literature that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can form an image by erasing any part of a document image with a simple configuration and has excellent operability.

[Brief explanation of drawings]

1 to 12 show an embodiment of the main part of an image forming apparatus according to the present invention, FIG. 1 is a perspective view of the main part showing a spot light source, and FIG. 2 is a perspective view of the main part showing a spot light source. FIGS. 3 and 4 are side sectional views of the main parts, and FIG. 6 is a diagram shown to explain the contents of the memory, FIG. 7 is a side sectional view of the main portion showing the arrangement of the erase array, and FIGS. 8 and 9 are the erase arrays. Fig. 8 is a perspective view showing only the main parts, Fig. 9 is a front view showing only the main parts, and Fig. 10 shows the configuration of the erasing array. Fig. 11 is a circuit configuration diagram showing the configuration of the play drive unit, Fig. 12 is a side sectional view, Fig. 11 is a partially cutaway front view, Fig. FIG. 13 is a side sectional view of main parts showing another arrangement example of the erasing array, and FIGS. 14 and 15 show the configuration of the image forming apparatus. , Fig. 14 is an overview perspective view, Fig. 15 is a side sectional view, Fig. 16 is a plan view showing the configuration of the operation panel, and Fig. 17 is a plan view showing the configuration of the operation panel.
The figure is a perspective view showing the configuration of the drive unit, Figure 18 is a perspective view schematically showing the drive mechanism of the optical system, Figure 19 is a perspective view schematically showing the drive mechanism of the pointer, and Figure 20 is the overall view. Fig. 21 is a block diagram showing the main processor group, Fig. 22 is a block diagram of the first sub-processor group, Fig. 23 is a block diagram of the second sub-processor group, and Fig. 24 is a block diagram of the main processor group. FIG. 25, which is a schematic configuration diagram showing a motor control circuit, is a diagram for explaining a speed control method of a four-wheel motor. 1...Copy machine body, 2...Original table, 21.2□...
・First. second fixed scale, 10...photosensitive drum;
308-30d...operation key, 30°...position specification key, 30(,30,...erasure range specification key, 33.
・・Scanning upper cylinder, 411 ・・1st cylinder, 71
... Main processor group, 131 ... Spot light source, 132 ... Light emitting element, J33 ... Lens, 135
... Nors motor, 150 ... Erasing array, 152
...Light emitting element, 153...Lens, 160...Array drive section, 140...Memory, P...Paper, ph
...Exposure section. Applicant's representative Patent attorney Takehiko Suzue Figure 3 Figure 4 (a) Figure 4 (1) Figure 5 Figure 6 Figure 13 FAQ Figure 10 (a) (b) Figure 11 1 !30 1 white 0 Fig. 12 2 Dt Fig. 22 Fig. 23 Fig. 25

Claims (4)

[Claims] (1) A charged image carrier that optically scans a document placed on the document table by a scanning means that moves from one end of the document table toward the other end, and uses a reflected light image from the document. In an image forming apparatus that forms an image by forming an image on a target material to form a charge pattern, and then developing this charge pattern, it is transferred and fixed to a transfer material to form an image. an instructing means for instructing a range; an erasing means for erasing charges in a portion corresponding to the designated range during image formation; and a state in which the surface to be scanned by the other end of the document platen when the range is designated is facing up. and a control means for moving the scanning means to the side of the original set at one end of the document table with the side to be scanned during image formation facing back. Features of the image forming device. (2) The image according to claim 1, wherein the indicating means is movable in a direction perpendicular to the moving direction of the scanning means and comprises a light emitting element and a lens that irradiates a spot light onto the document surface. Forming device. (3) The erasing means includes a calculation means for making the range designated by the instruction means correspond to the position of the scanned document, and a calculation means disposed near the image carrier along the longitudinal direction of the image carrier, and the erasing means 2. The image forming apparatus according to claim 1, comprising a plurality of light emitting elements whose lighting is controlled by an output signal from the means. (4) The image forming apparatus according to claim 1, wherein a scale is provided at one end and the other end of the document table to serve as a reference for setting the document.