JPS61103174A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain an image forming device which can erase an optional part of an original image to form an image and can recognize easily the erasing range, by making the diameter of a spot light equal to that of each light emitting element and allowing the erasure designated range and the erasing range to correspond to each other in 1:1. CONSTITUTION:A guide shaft 130 is provided along a lamp 4 in the part, which is shielded from the light of the lamp 4, of the first carriage 411, and a spot light source 131 as a means which indicates the erasing range of an original is provided freely movably on the guide shaft 130. This spot light source 131 consists of a light emitting element 132 such as a diode, a lamp, or the like and a lens 133 provided to face an original platen 2, and this spot light is irradiated on the original platen 2 as a spot light having a diameter (d) by the lens 133 and has such luminance that the spot light can be transmitted through an original G having a thickness like a postal card. The spot light source 131 is moved in the direction orthogonal to the scanning direction of the first carriage 411 by rotation of a pulse motor 135.

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]

Generally, an electronic copying machine has the function of copying an original image onto paper as is, or 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]

The present invention has been made based on the above circumstances, and its purpose is to form an image by erasing any part of a document image, and to easily recognize the erased range. The present invention aims to provide an image forming apparatus.

[Summary of the invention]

This invention irradiates a document image with a spotlight, moves this spotlight to specify an erasure range of the document image, and emits light from a plurality of light emitting elements on a photoreceptor drum in accordance with the designated erasure range. In particular, the diameter of the spot light is made equal to the diameter of each light emitting element, and the designated erasing range and the erasing range are set one-to-one. This corresponds to the above.

[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
Nearby is a document cover 1 that can be opened and closed! And work table 1! is provided. The original set on the original platen 2 is exposed to an exposure land 4 and mirrors 5 and 6.
．． The optical system 3 consisting of
By reciprocating in the direction, exposure and scanning are performed during the reciprocation. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the above optical system,
The light reflected from the original by the light irradiation of the exposure lens 4 is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, is further reflected by the mirror 9, and is reflected by the photoreceptor drum 10. The image of the document is formed on the surface of the photosensitive drum 10.

The photosensitive drum 10 rotates in the direction of arrow C, and its surface is first charged by the charging device 11. Then, the image of the document is exposed to slit light to form a static latent image. The 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 delivery roller 15 or 16, and the paper guide path 1
7 or 18, and is guided to a pair of registration rollers 19, and sent to a transfer section by this pair of rollers 19FC. Here, each of the paper feed cassettes 13, 14
is removably provided at the lower right end of the main body 1,
In the operation/control described later, it is possible to select one of the h deviations. Note that each of the paper feed cassettes 13.
14 are cassette size detection switches 60% and 6, respectively.
0! The cassette size is detected by

These detection switches 601, 60. is composed of a plurality of microswitches that are turned on and off depending on the insertion of cassettes of different sizes.

On the other hand, the paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that
The toner image on the photosensitive drum 510 is transferred by the action of the charger 20. 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. Further, after the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, residual toner on the surface is removed by the cleaner 22, and the afterimage is erased by the charge removal run fzs, so that the drum returns to its initial state. ing. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 16 shows the operating channel 30 provided on the main body 1. 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, paper size, etc.;
04 is upper and lower paper feed (cassette) 1,? , 74
30s is a cassette display section that displays the selected cassette; 306 is a copy enlargement key;
Magnification setting key 307 for setting the reduction magnification in a predetermined relationship
is a zoom key that allows you to steplessly set the magnification and reduction ratio, 30
s is a display section for displaying the set magnification, 309 is a density setting section for setting copy density 1.90 m, 30 b
, 30 c, ,? Od is an operation key for moving a spot light source indicating the erase position of the original, which will be described later;
30m is a position designation key for inputting the seat cap position indicated by the spot light source, and 301.30g is an erasure range designation key for designating the erasure range at each designated position.

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 motor for changing the distance (optical path length) between the mirror 5 and the mirror 6°7 for zooming. 3
3 is a scanning motor, which connects the exposure land 4 and mirror 5;
, 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. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. , 36
A drum motor is a motor for driving the photosensitive drum 10. 37 is a fixing motor, which connects the paper transport path 22, the pair of fixing rollers 23, and the pair of paper ejection rollers 24.
This is a motor for driving.

A paper feeding motor 38 is a motor for driving the delivery rollers 15 and 16. 39 is a paper feed motor;
This 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 moving the optical system 3 back and forth. That is, the mirror 5 and the exposure lamp 4 are placed in the first carriage 411, and the mirror 6.7 is placed in the second carriage 411.
These carriages 411 and 412 are supported by carriages 412, respectively, and are guided by guide rails 42@, 42g to be able to move in parallel in the direction of arrow a. That is, the four-phase 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 a first carriage 41 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, the second carriage 41 supporting the mirror 6.7 has a rail 42 and a mushroom guide section 46.
2! Two days apart in the axial direction of IJ 47 , 47
These pulleys 47 and 4 are rotatably provided.
A wire 48 is strung between the parts 7 and 7. One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Also,
A first carriage 41. One end is fixed. Therefore, the gurus motor 33
As the belt 45 rotates, the first carriage 411 moves, and the second carriage 411 moves accordingly.
Move one goose. At this time, since the wheels 47 and 47 serve as movable pulleys, the second carriage 41 moves in the same direction at the same speed as the first carriage 4. In addition, 1. The moving direction of the second carriage '11+41B is controlled by switching the rotational direction of the 9th motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper size specified by the paper selection key 3θ4 is set as (px, Py), and the magnification setting key 306 is pressed.

Assuming that the copy magnification K is specified by 307tlC,
The copyable range (x, y) is as follows: x=Px/K y=Py/. Of this copyable range (x, y), the X direction is indicated by a pointer 51° 52 provided on the back surface of the document table 2, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411. It is divided as shown by

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 the rotation of the motor 58 is driven according to the paper size and magnification, so that the pointer 51.5x
The distance between them can be changed.

Further, the first carriage 41 is moved to a predetermined position (home position according to the magnification rate) by driving a motor 33 according to the paper size and magnification. Then, when the copy key 301 is pressed, wc
The first carriage 41X first carries the second carriage 41. direction, and then run f4 is turned on and the second carriage 41. is moved in the direction away from.

When scanning of the original is completed, Lande 4 is turned off and the first
The carriage 411 is returned to the home position.

FIG. 20 shows the overall control circuit, including the main processor group 7 and the main processor group 1. 2nd subgrossetsa group 72.7
It is mainly composed of 3. The above main processor group 71
Fi, operation/4 channel 30 and various switches and sensors, such as the cassette size detection switches eol, eoH
a high-voltage transformer 76 that detects input from input devices 25 such as, and drives the various chargers, the static elimination run f21J;
, the blade solenoid 1" 27g of the cleaner 22, the heater 23a of the fixing roller pair 23, and the exposure lamp 4.
, and each of the motors 30 to 40.58 to perform the above-described copying operation, and also control the spot light source 13.
1,/4' pulse motor 135, erasing array 150, array drive unit 160, memory 140, etc., to erase unnecessary portions of the document. In addition, spot light source 1
31, /'9 pulse motor 135, erase array 150. The array driver 160 and memory 140 will be described later.

The motors 31 to 40, . 5 Among B, motor?
A toner motor 77 that supplies toner to 5, 37, 40 and the developing device 12 is controlled by a main processor group 71 via a motor driver 78, and is controlled by a main processor group 71 via a motor driver 78.
4 and 135 are controlled by the first sub-processor group 72 via a pulse motor driver 79, and the motors 16,
39°3 B r 5 II u , 4 is controlled by the second sub-processor group 73 via the Luss motor driver 80 .

Further, the exposure lamp 4 is controlled by the main processor group 7 via a lamp regulator 81, and the heater 23! L is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71, the first.
The second sub-processor group 72, 73 is connected to drive each motor;
A stop command is sent, and the first. Second sub-processor group 72.
73 to the main processor group 71 for driving each motor,
A status indicating a stopped state is sent. Further, the first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.

FIG. 21 shows a configuration example of the main processor group 71. That is, numeral 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer) which detects human input from keys on an operation panel (not shown) and performs various display controls through an input/output port 92. Also, microcomputer 91
is expanded by input/output ports 93-96. The input/output port 93 is connected to a high voltage transformer 76, motor driver 78, lamp regulator 8, and other outputs, and the input/output port 94 is connected to a size switch for detecting paper size and its individual inputs.
A copy condition setting switch and its respective inputs are connected to the input/output port 95. Note that the input/output port 96 is for an option.

FIG. 22 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group-71. Reference numeral 102 is a programmable interval timer for controlling the phase switching interval time of the arm pulse motor, and when a set value is set from the microcomputer 101, the timer is counted based on the set value, and when the count is out, the end time is set by the microcomputer. Output to interrupt line 10. A reference clock/clock signal is input to the timer 102. Also, microcontroller 10
1 receives position information from the position sensor 83 and is connected to input/output ports 103 and 104.

The motors 31 to 34.135 are connected to the input/output port 104 via the 9th motor driver 19. The human output port 103 is used for outputting status signals of each motor to the main processor group 71.

FIG. 23 shows an example of the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, and is connected to the main processor group 71. Reference numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 111, it counts based on it, and outputs a termination pulse when the count is out. . This end IQ pulse is latched by a latch circuit 113, and its output is supplied to the interrupt line of the i-icon 111 and the input/output port input line.

An input/output port 114 is connected to the microcomputer 111, and a motor 36.311.3 is connected to the input/output port 114 via the pulse motor driver 80.
9.58 is connected.

FIG. 24 shows the control circuit for the 9-pulse motor, and the input/output port 121 (corresponding to the input/output ports 104, 114 in FIGS. 22 and 23) is connected to the 9-pulse motor driver 1.
22 (in Figure 20) J? Luss motor driver 79.80
) is connected to this/mother motor driver 12
2, the pulse motor 123 (the pulse motors 31 to 3)
4° 36.38.39) each winding A, A, B.

B is connected.

Figure 25 shows the speed control method of the ・9 Lus motor, (a) is the speed curve of the ・4 Lus motor, and (b)
The figure shows the phase switching interval. As is clear from this figure, the phase switching interval is long at first, gradually shortens, then becomes equal intervals, gradually becomes longer again, and then stops. That is, this indicates the slew-up and slew-down of the arm motor, which is initially used in the self-starting region, start-up, high-speed region, and then falls. In addition, 1. .

t2...tx indicates the time of the phase switching interval.

Next, the main parts of this invention will be explained. Figures 1 and 2
In the figure, the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in the part where the light of the land 4 is blocked, and this guide shaft 130 is provided as a means for indicating the erasing range of the document. A spot light source 131 is provided movably. This spot light source 131 includes, as shown in FIG.
The light generated by the light emitting element 132 is directed through the lens 133 to the document table 2 as a spot light d. This spot light is applied to a document G set on the document table 2, for example, the thickness of a postcard.
It has a brightness that allows it to pass through.

Further, the spot light source 131 is connected to a timing belt (toothed belt) 134 disposed along the guide shaft 130. This timing belt 134 is passed between a pulley 136 and a driven pulley 137 provided on the rotating shaft of the Nolls motor 135. Therefore, by rotating the lance motor 135, the syspot light source 131 is moved in a direction perpendicular to the running direction of the first barrel 411. In addition, a position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131 is provided on the first shaft 411 located at the end of the guide shaft 130 on the side of the main motor 135. When the light source 131 is moved, the spot light source 131 first comes into contact with the position sensor 138, and the initial position is detected.

Next, using FIGS. 3 to 5, the spot light source 13
A method of specifying the erasing range of a document using the following will be explained. This spot light source 131 is connected to the operation key 30 described above.
By operating a to 30d, the diameter d of the spot light
The above-mentioned lens motor 33°1 is moved at an integral multiple of
35 are controlled. That is, operation key 3
When 0b and 30d are pressed, the motor 33 is driven and the first
Calitsuno 41. 1 and spot light sources 1 and 3 are moved in the scanning direction (direction of arrow X shown in FIG. 3) K. Also,
Operation key 30a.

When 30e is pressed, the motor 135 is driven and the spot light source 131 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 3). The operator operates operation keys 30h to 30d while visually observing the spot light transmitted through the original G, and presses the position designation key 30e after moving the spotlight to point Si on the original G shown in FIG. 4, for example. 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 30 is pressed with the spotlight moved to 81 points on the document G, the position of the 81 points is stored in the main processor group 71. The position of this spot light is, for example, a pulse mode (33.135 driving/
It can be detected by counting the number of mother russes.

After this, when the erasure range designation key 301 is pressed, the
), a rectangular area (indicated by diagonal lines) having the diagonal point <81+Si is designated as the erasing range.

Also, as shown in FIG. 4(b), there are 83 points on the original G.

Specify 84 points and press the erase range designation key 30g.
3. The area other than the square with the 84 points as diagonal points is designated as the erasing range. In this way, the erase range specification key so
When t and sog are pressed, the main processor group 71 performs calculations based on the positions of the two designated points, and the memory 140 receives a high level signal @1'' in the erase range area and a low level signal in the other areas. Signal "O" is stored.

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 X direction, and the capacity in each row direction is approximately equal to the moving distance in the X direction of the spot light source 131.
In the case of FIG. 4(a), , as shown in FIG. 5(a), and in the case of FIG. 4(b), as shown in FIG. A low level signal is stored in the memory.

On the other hand, as shown in FIG. 6, 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 phO. This erase array 1
50, as shown in FIGS. 7 and 8, a plurality of light-shielding cells 151 are arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and inside each of these cells 151, as shown in FIG.
As shown in a) and (b), a light emitting element 152 made of, for example, a light emitting diode is provided. Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 . The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. Here, if the distance between the light emitting elements 152 (erasing pitch) 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. 10, this array driving section 160 includes a shift register 161 having the same number of pits as the number of bits in the column direction of the memory 140, 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 this store register 162. The movable contact pieces 163a 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) J5J constituting the erase array 150, respectively. The anode of each of these light emitting elements 152 is connected to the power supply VCC via a current limiting resistor R, respectively.

After specifying the erasing 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 also copied. Data for one column is read out sequentially in the direction (shown in FIG. 5). The 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 has been transferred to the shift register 161, when the charged portion of the photoreceptor drum 10 reaches the erase array 150, the main processor group 71 sends the erase signal LT.
H is output, and in response to this signal, the shift register 161
The contents of are provided to store register 162.

That is, since the erasing array 150 is disposed between the charger 11 and the exposure section ph, one column of data output from the memory 140 is stored when the angle between the erasing array 150 and the exposure section ph is θl. So, if the photosensitive drum 10 is rotating at an angular velocity ω, then θ! The output timing of the latch signal LTH is controlled so that it is supplied to the store register 1 register 162 before /ω.

Each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. When the output signal of the store register 162 is at a low level, it is turned on, and when it is at a low level, it is turned off. As a result, the light emitting elements 152 . The light is turned on when the Fi switch element 163 is on, and the light is turned off when the Fi switch element 163 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 this charge-free part is subsequently exposed to light, no electrostatic layer or image is formed, and the original image cannot be erased. It has been done. Thereafter, in the same manner, the memory 140
The data is read out one column at a time, and the image is erased.

For example, the erasing array 150 may be disposed not only between the charger 11 and the exposure section pb as shown in FIG. 6, but also between the exposure section pb and the developer 120 as shown in FIG. It is also possible to configure the electrostatic latent image formed so as to be erased according to a designation.

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

Now, the diameter d of the spot light irradiated onto the document table 2 by the spot light source 13 and the mutual distance (erasing pitch) P between the light emitting elements 152 in the erasing array 150 are set in the relationship d=P. There is. However, the diameter d of the spot light
This diameter d is ideal because there is blurring due to scattering of light transmitted through the original.

Furthermore, as mentioned above, the spot light is moved by an integer multiple of its diameter d, so if the area indicated by the broken line in FIG. y) is expressed as x = d X n (n, mt! integer) y = d X m. In addition, the erasing range shown by the broken line in FIG. 2B is expressed as x = d X 2 y = d X m.

In this way, by making the diameter d of the spot light and the erasing pitch P equal, the specified erasing range matches the erasing range that is actually erased, so the operator can easily recognize the erasing range. It is something that can be done.

In FIG. 13, the shape of the spot light Sc is a cross, and the erasing range is indicated by two adjacent sides of it. Even with such a configuration, similar effects can be obtained.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to form an image by erasing any part of the original image.
It is possible to provide an image forming apparatus that is convenient for editing the reproduced image, and furthermore, since the specified erasure range and the actual erasure range match, the erasure range can be easily recognized.

[Brief explanation of the drawing]

1 to 10 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. 3 to 5 are plan views for explaining the operation of specifying the erasing range of an original using a spot light source, and FIG. 6 is a side sectional view of the main part showing the arrangement of the erasing array. (A side sectional view, FIG. 7, and FIG. 8 each show the relationship between the erasing array and the photosensitive drum.) FIG. 7 is a perspective view showing only the main part, and FIG. 8 is a front view showing only the main part. Figures 9 and 9 show the configuration of the erasing array, in which figure (a) is a side sectional view, figure (b) is a partially cutaway front view, and figure 10 is a play drive unit. 11 is a side sectional view of the main parts showing another example of the arrangement of the erasing array; FIG. 12 is a diagram shown to explain the relationship between the diameter of the spot light and the designated erasing range; FIG. 13 is a diagram for explaining another shape of the spot light, FIGS. 14 and 15 are diagrams showing the configuration of the image forming apparatus, FIG. 14 is an overview perspective view, and FIG.
The figure is a side sectional view, FIG. 16 is a plan view showing the configuration of the operation/gunnel, FIG. 17 is a perspective view showing the configuration of the drive section, and FIG. 18 is a perspective view schematically showing the drive mechanism of the optical system. , Fig. 19 is a perspective view schematically showing the pointer drive mechanism, Fig. 20 is a block diagram showing the overall control circuit, Fig. 21 is a block diagram of the main processor group, and Fig. 22 is the first subprocessor group. Fig. 23 is a block diagram of the second processor group, Fig. 24 is a block diagram of the second processor group.
What is the diagram? Schematic configuration diagram showing the control circuit of the Luss motor, Part 2
FIG. 5 is a diagram for explaining the speed control method of the /4′ motor. 1...Main body, 2...Original table, P...Paper, 1θ・
...Photosensitive drum, 30a-30d...Operation keys 1.
? (741...Position specification key, J Of * 30g
...Erase range specification key, 33...Scanning motor, 4
1K...first carriage, 131...spot light source, 132...light emitting element, 133...lens, 135
... Pulse motor, 150 ... Erasing array, 152
...Light emitting element, 153...Lens, 160...Array, drive section, 140...Memory, d...Diameter of spot light, P...Erasing pitch. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 4 (a) Figure 4 (b) Figure 5 (b) Figure 6 Figure 11 '11 lU Figure 8 Figure 9 Figure 22 Female Figure 23

Claims (5)

[Claims] (1) A photoreceptor that holds an electric charge, a charging means that applies an electric charge to the photoreceptor, a scanning means that optically scans an original image, and an exposed portion of the photoreceptor that is charged by the charging means. An image comprising an exposure means for exposing the light guided by the scanning means to form a charge pattern corresponding to the original image, and a developing means for developing the charge pattern formed on the photoreceptor by the exposure means. In the forming device,
a specifying means for specifying a specific position or range on the document surface using a spot light source; and a specifying unit disposed along the longitudinal direction of the photoreceptor at a pitch approximately equal to the diameter of the spot light source, the specified specific position or range; 1. An image forming apparatus comprising: erasing means for erasing charges on a photoreceptor in accordance with the image forming apparatus. (2) The specifying means includes a light emitting element and a lens that irradiate a spot light onto the document surface, and these are provided in the scanning means and are moved by the scanning means in integer multiples of the diameter of the spot light. An image forming apparatus according to claim 1. (3) The image forming apparatus according to claim 1, wherein the erasing means comprises a plurality of light emitting elements. (4) The third aspect of the present invention is characterized in that the plurality of light emitting elements are arranged between the charging means of the photoreceptor and the exposure section.
The image forming apparatus described in . (5) The third aspect of the present invention is characterized in that the plurality of light emitting elements are disposed between the exposure section of the photoreceptor and the developing means.
The image forming apparatus described in .