JPS61105571A - Image forming device - Google Patents

Abstract

PURPOSE:To erase an optional part of an original image to form an image with simple constitution by moving spot light to designate the erasure range of the original image and irradiating light on a photosensitive drum from plural light emitting element in accordance with the designated erasure range to erase an electrostatic latent image or electrostatic charge. CONSTITUTION:When points S3 and S4 on an original G are designated and erasure range designating keys 30f and 30g are depressed, an operation is performed in a main processor group 71, and a high-level signal and a low-level signal are stored in the erasure range part and the other part respectively in a memory 140. Each switch element 163 of a switch circuit 164 is controlled by each output signal of a store register 162 so that the element 163 is turned on when the output signal is in the high level and the element is turned off when the output signal is in the low level, and each light emitting element 152 is lit when the corresponding switch element 163 is turned on, and the element 152 is extinguished when the corresponding switch element 163 is turned off, and the part, where light emitting elements 152 are lit, the electrified part of a photosensitive drum 10 is destaticized to erase the original image there. Similarly, data in the memory 140 are read out row by row to erase the 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 background of the invention and its problems]

In general, an electronic copying machine has the function of copying an original image onto paper as is, and also enlarging or reducing the original image for copying.

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]

Jin's invention was made based on the above circumstances, and its purpose is to provide an image forming apparatus that can form an image by erasing any part of a document image with a simple configuration. It is something to do.

[Summary of the invention]

This invention provides a scanning means for optically scanning an original image (a spot light source is provided, and a spot light source generates a spot light source).
．． The spot light is irradiated onto the nuff original image, the spot light is moved to specify the erasing range of the original image, and a plurality of light emitting elements are used to irradiate the photoreceptor drum with light corresponding to the specified erasing range to staticize the image. An image is formed by erasing the electrostatic latent image or charge.

[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
A document cover 1□ and a work table 1, which can be opened and closed, are provided near the document cover 1□. The original set on the original platen 2 is exposed to an exposure lamp 4 and mirrors 5, 6,
The optical system 3 consisting of 7/ is crushed against the bottom surface of the document table 2 and
By reciprocating in the direction, exposure scanning is performed during the reciprocation.In this case, the mirror 6.7
moves at half the speed of the mirror 5 so as to keep the optical path length at one foot. The light reflected from the document by the scanning of the optical system, that is, the light reflected from the document by the light irradiation of the exposure lamp 4 is reflected by the mirrors 5, 6.7, and then passes through the variable magnification lens 8; The light is further reflected by the mirror 9 and guided to the photoreceptor drum ioK, 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 original image is exposed to light to form an electrostatic latent image. The latent image is made visible by applying toner by a 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 11
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 are as follows.

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 above-mentioned paper feed cassettes 13 and 14 has a cassette size detection switch, 0□, 60.
The skein size is detected by this method. This detection switch, Chiro 0□, 60 Yo, has different size cassettes 7.
It consists of multiple microswitches that are turned on and off depending on the insertion of the plug.

On the other hand, the paper P sent to the transfer section is charged by the transfer charger 200.
By partially coming into close contact with the surface of the photoreceptor drum 10,
The toner image on the photosensitive drum lo 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. passing through here
The transferred image is fixed. Then, the paper P after fixing is
The paper is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. 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 27, and the residual image is erased by the charge removal land 28, so that the drum 10 returns to its initial state. ing. Note that 29 is a cooling unit 77 for preventing the temperature inside the main body 1 from rising.

FIG. 16 shows the operation panel 30 provided on the main body 1. 30□ is a copy key that commands the start of copying, 30
．． 30 is a numeric keypad for setting the number of copies, etc. 30 is a display section that displays the operating status of each section and paper jams, etc.;
．． 30 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 30. is a cassette display section that displays the selected cassette; 307 is a magnification setting key for setting the enlargement and reduction magnification of copies in a predetermined relationship; 307 is a zoom key for setting the enlargement and reduction magnification steplessly; 30. 30. is a display section that displays the set magnification; 30a, 30b, 30e, 304 are operation keys for moving a spot light source indicating the erasing position of the original, which will be described later. 30e is a position specifying key for inputting the coordinate position indicated by the spot light source. Sat.

sog is an erasure range specification key that specifies 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, numeral 31 is a lens motor, which is a motor for moving the position of the lens pro 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 lamp 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. 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. 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 supported by a first carriage 411K, and the mirror 6.2 is supported by a second carriage 41°, and these carriages 411.41. is guide rail 42□, 4
2. It is guided by and can move freely in parallel in the direction of the bottom of the arrow. That is, the four-phase pulse 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 rail 42. of the second carriage 418 supporting the mirror 6.7. The guide section 46 includes two pulleys 47.4'i spaced apart in the axial direction of the rail 428.
are rotatably provided, and these pulleys 4F, 4
A wire 48 is strung between the parts 7 and 7. One end of this wire 48 is fixed to a fixing portion 49, and the other end is fixed to the fixing member N549 via a coil spring 50. Further, one end of a first carrier 411 is fixed to a midway portion of the wire 48. Therefore, the pulse motor 33
As the belt 45 rotates, the first carriage 41 moves, and the second carriage 41 moves accordingly.
18 will also move.

At this time, since the pulleys 47, 47 serve as movable pulleys, the first gear, the first gear 41. against the second carriage 4,
move in the same direction at the speed of the arrow. In addition, 1. Second
Kyari, Ji4noK.

The direction of movement of 41 is controlled by switching the direction of rotation of the 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 3Q4 is (Px * Py),
Magnification setting key 30. ．． If the copy magnification specified by 30 degrees is K, the copyable range (x + y) is x = Px / K y = Py / K. Of this copyable range (X # y),
The direction is indicated by the pointers 51 and 52 provided on the back side of the original platen 2, and the y direction is indicated by the pointer 51. It is displayed by a scale 53 provided on the top surface of the screen.

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 51.5
The distance between the two can be changed.

Further, the first carriage 41□ 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 30□ is pressed, the first
The carriage 411 is first moved in the direction of the second carriage 418, and then the lamp 4 is turned on and the carriage 411 is moved toward the second carriage.
Ji41. is moved in the direction away from.

When scanning of the original is completed, the lamp 4 is turned off and the first carrier 411 is returned to the home position.

Figure 20 shows the overall control circuit.

The main processor group 71 and the first . The second sub-processor is mainly composed of groups 72 and 73. Above:) The main processor group 71 detects inputs from input devices 75 such as the operation/mains panel 30'' and various switches and sensors, such as the cassette and size detection switches 60□, 60. the high voltage transformer 76 that drives the static eliminating land 28, the platen lenoid 27a of the cleaner 27, and the heater 2 of the fixing roller pair 23.
3a, the exposure lamp 4, and each of the motors 30 to 4
. The erase array 150, array drive unit 160, memory 140, etc. are controlled to erase unnecessary portions of the document.

Incidentally, a spot light source 131, a wrist motor 135, an erasing array 150. Array behavior 8160. Memory 140 will be described later.

Among the above motors 31-40.5g, motor 35.31
．． A toner motor 77 that supplies toner to the developing unit 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
are controlled by the first sub-process group 72 via a motor driver 79, and the motors 36, 39.3B.

51j is controlled by a second sub-route control group 73 via an A-system motor driver 80. Further, the exposure lamp 4 is controlled by the main group 71 via the lamp regulator 81, and the heater 23m is controlled by the main group 71 via the heater control section 82. Then, from the main processor group 71, the first. Commands to drive and stop each motor are sent to the second subprocessor group 72, '13. A status indicating the drive or stop state of each motor is sent from the second sub-processor group 72, 73 to the main sub-processor group 71.

The first subprocessor group 72 also includes motors 31 to 3.
Position information from a position sensor 83 that detects each initial position of 4 is input.

FIG. 21 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which performs key human power detection on an operation panel (not shown) and various display controls through an input/output port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96. The input/output port 93 is connected to a high voltage transformer 76, motor driver 78, lamp regulator 81, 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 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. 102 is I? This is a programmable interval timer for controlling the pulse motor phase switching interval time, and by setting a setting value from the microcomputer 101, it counts based on it.
When the count is out, a termination pulse is output to the interrupt line of the microcomputer 101. The timer 102 includes a reference clock,
Kutsutsurusu has been input. Further, the microcomputer 101 receives Kanakura 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 pulse motor driver 79. The input/output port 103 is the main terminal for the status signal of each of the four motors.
Used for output to 1, etc.

FIG. 23 shows an example of the configuration of the second sub-processor group 73. In other words, 111 is my=r y terror'
) The main process is connected to the main process group 71. 11
Reference numeral 2 denotes a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set by the microcomputer 111, it counts based on the set value, and outputs a termination pulse when the count is out. This termination pulse is applied to 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, an input/output port 114 is connected to the microcomputer 11, and the input/output ports 114 are connected to the motors 3g, 3g, 39, 51 via the pulse motor driver 80.
3 is connected.

FIG. 24 shows the control circuit of the Noculus motor.
2 (Fig. 20 77) /'/'Smotor driver 79.
80) is connected, and this pulse motor driver 1
22, a 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 a pulse motor.
The figure (a) shows the speed curve of the pulse motor, and the figure (b) shows the phase switching interval. As is clear from this figure,
At first, the phase switching interval is long, gradually shortens, eventually becomes equal, then gradually increases again, and then stops. That is, this shows the through-down and through-down of the arm motor, which starts from the self-starting region, uses in the high-speed region, and then falls 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, the first carriage 41 □ is provided with a guide shaft 130 that is collected by the rung 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 is provided with a guide shaft 130 as a means for indicating the erasing range of the document. A spot light source 131 is provided movably. As shown in FIG. 2, this spot light source 131 includes a light emitting element 132, such as a light emitting diode or a lamp, and a lens 133, which are provided opposite to the document table 2.
The light generated by the light emitting element 132 is irradiated onto the document table 2 by a lens 133 as a spot light having a diameter d. Is this spot light on the manuscript table? For example, a document G with the thickness of a postcard is set in
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 /4 Luz motor 1350. Therefore, by rotating the pulse motor 135, the spot light source 1
31 is moved in a direction perpendicular to the scanning direction of the first carriage 41m. In addition, the pulse motor 1 of the guide shaft 130
A position sensor 138 consisting of a microswitch that detects the initial position of the spot light source 131 is provided on the first carriage 41□ located at the end of the spot light source 131. For example, when the spot light source 131 is moved, first, The spot light source 131 comes into contact with the position sensor 138 to detect the initial position.

Next, as shown in FIGS. 3 to 5, the above-mentioned spot is used.

A method of specifying the erasing range of a document using the light source 131 will be described. By operating the aforementioned operation keys 30a to 30 (1), the /IP pulse motor (33° 135) is controlled so that this spot light source 13 is moved by an integral multiple of the diameter d of the spot light. That is, when the operation keys 30b and 30d are pressed, the motor 33
is driven, and the first carriage, gear 41, and spot light source 13 are moved in the scanning direction (direction of arrow y shown in FIG. 3). Also, the operation key is 30 m.

When 30e is pressed, the motor 135 is driven, and the spot light source 13 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 3). The operator operates the operation keys 30a to 30d while visually observing the spot light transmitted through the document G, and presses the position designation key 30@ with the spotlight moved to point S1 on the document G shown in FIG. 4, for example. . Then, the coordinate position specified by this Sl is stored in the main process group 71 shown in FIG.

In the same way, move the spotlight to point S3 on document q and press position designation key 30m, S! The position of the point is stored in the main memory group 71. The position of this spot light can be detected, for example, by counting the number of driving pulses of the pulse mode.

After that, when the erasure range specification key 30f is pressed,
) As shown by K<Si rS A rectangular area (indicated by diagonal lines) having the diagonal point as the point is designated as the erasing range.

In addition, as shown in FIG. 4(b), if you specify the S1 point and the 84th point of the original G and press the erase range specification key sog, S...
, the area other than the square whose diagonal points are the points is designated as the erasing range. Like this K, erase range specification key sot, s
When oy is pressed, calculations are performed in the main process group 71 based on the positions of the two specified points, and the memory 140 is
, a high level signal 1'll# is stored in the erase range portion, and a low level signal 1'll# 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 13 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 13.
The main processor group 71 uses the data supplied by the main processor group 71 to create a RAM whose movement distance in the y-direction divided by the position resolution in the y-direction is approximately the same as that of the main processor 71.
In case a), as shown in Figure 5(a),
In the case of Fig. 4(b), as shown in Fig. 5(b),
High level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses.

On the other hand, as shown in FIG. 6, an erasing array 150 as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section ph. This erase array 1
50 is a photosensitive drum 100 as shown in FIGS. 7 and 8.
A plurality of light-shielding cells 151 are arranged in a direction perpendicular to the rotational direction, and inside each of these cells 151 there are shown the lines 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 IQ. The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 1400 in the column direction. Here, the distance between the light emitting elements 152 (erasing pitch) is P.

If the number is N, the total length of the erase array 150 is Q=NX
It becomes P.

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 1400, and a store register 16 in which the contents of this shift register 16 are held.
2. A plurality of switches controlled on and off by each output signal of the store register 162.

The movable contact piece 16 of these switch elements 163
3a is grounded, and fixed contacts 163b are connected to light emitting elements (light emitting diodes) 152 constituting the erasing array 150, respectively.
connected to each cathode. Each of these light emitting elements 15
The two anodes are connected to the power supply vcc through current control resistors R, respectively.

After specifying the erase range of the original as described above, when the original cover 1□ is closed and the copy key 301 is pressed, the first carry, the first carry 41□ and the photosensitive drum 10 are operated, and the Data for one column is sequentially read from the memory 140 in the row direction (shown in FIG. 5). This read data D8 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 outputs a chi signal L.
TH is output, and in response to this signal, the shift register 16
The contents of 1 are provided to store register 162.

That is, since the erase play 150 is disposed between the charger 11 and the exposure section Ph, one column of data output from the memory 140 may be stored at an angle of θ between the erase array 150 and the exposure section Ph. , and assuming that the photosensitive drum 10 is rotating at an angular velocity ω, the output timing of the chi signal LTH is controlled so that it is supplied to the store register 162 before noon by 0□/ω.

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, 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, among the charged parts of the photoreceptor drum 10, the part where one light emitting element 152 is turned on is charge-free, and even if this charge-free part is subsequently exposed to light, no electrostatic latent image is formed, and the original image is not erased. I'm sorry for what happened. Thereafter, the data in the memory 140 is read out one column at a time in the same way, and the image is erased. It is also possible to arrange it between the developing devices 120 and to erase the formed electrostatic latent image according to a designation.

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

Now, previous description 4. The diameter d of the spot light irradiated onto the document table 2 by the light source 131 and the erasing area 15
The mutual distance (erasing pitch) P between the light emitting elements 152 at zero is set to the relationship d=P. 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. is expressed as y=dXm. In addition, in the case of the erasing range shown by the broken line in FIG. 6(b), it is expressed as x = d

By making the numbers equal to P, the specified erasing range matches the erasing range that is actually erased, so that the operator can easily recognize the erasing range.

In FIG. 13, the shape of the spotlight 3e is a cross, and two adjacent sides of width t indicate the erasing range. 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 convenient for editing copied images, etc. Furthermore, since the spot light source serving as the indicating means is provided in the first carriage serving as the scanning means, there is no need to provide a separate moving means, and the configuration is simple. It is possible to provide an image forming apparatus that can be

[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. FIGS. 3 to 5 are a side sectional view of the main part, and FIGS. 3 to 5 are plan views shown to explain the operation of specifying the erasure range of a document using a spot light source, respectively. FIG. 6 is a side view of the main part showing the arrangement of the erase play. A sectional view, FIG. 7, and FIG. 8 each show the relationship between the erasing play 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. Fig. 9 shows the configuration of the erasing array. Fig. 9 (,) is a side sectional view, Fig. 9 (b) is a partially cutaway front view, and Fig. 10 shows the structure of the array drive section. FIG. 11 is a side sectional view of the main parts showing another arrangement example of the erase play, FIG. 12 is a diagram shown to explain the relationship between the diameter of the spot light and the specified erase range, and FIG. 13 is sports 2. Ka,. ,. Figures 14 and 15 show the configuration of the image forming apparatus. Figure 14 is a perspective view, Figure 15 is a side sectional view, and Figure 16 is a side sectional view. FIG. 17 is a plan view showing the structure of the operation panel, FIG. 17 is a perspective view showing the structure of the drive unit, FIG. 18 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. 19 is a schematic view of the drive mechanism of the pointer. 20 is a configuration diagram showing the overall control circuit, FIG. 21 is a configuration diagram of the main group, and FIG. 22 is a configuration diagram of the main group. Diagram of the composition of the Tuprosetusa group,
FIG. 23 is a block diagram of the second processor group, FIG. 24 is a schematic block diagram showing the control circuit of the pulse motor, and FIG. 25 is a diagram for explaining the speed control method of the Noculus motor. 1...Main body, 2...Original table, P...Paper, 10.
...Photosensitive drum, 30a-30d...Operation key, 3
0e...Position specification key, 30f, 30g...Erase range specification key, 33...Scanning motor, 411...First carry, 131...Spot light source, 132...
- Light emitting element, Jss... Rays, 135... Pulse motor, 140... Memory, 150... Erasing array, 152... Light emitting element, 153... Lens, 1
60...Array drive unit, d...Diameter of spot light,
P′...Elimination pitch. Fig. 5 Fig. 11 Fig. 8 Fig. 9 Fig. 1 ON 1 White O Fig. 13 Fig. 14 Fig. 23 @ 1825 @

Claims (6)

[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. The image forming apparatus includes an exposure means for exposing the light guided by the scanning means to form a charge pattern corresponding to a document image, and a developing means for developing the charge pattern formed on the photoreceptor by the exposure means. In the image forming device,
The scanning means is provided with an instruction means for instructing a specific position or range on the document surface using a spotlight, and an erasing means for erasing the charge on the photoreceptor in accordance with the specific position or range indicated by the instruction means. An image forming apparatus characterized by: (2) The image forming apparatus according to claim 1, wherein the instruction means includes a light emitting element and a lens that irradiate a spot light onto the surface of the document. (3) The image forming apparatus according to claim 1, wherein the erasing means comprises a plurality of light emitting elements arranged near the photoreceptor in a direction orthogonal to the longitudinal direction of the photoreceptor. (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 . (6) The image forming apparatus according to claim 1, wherein the scanning means is driven by a pulse motor.