JPS61243468A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain a device which specifies and erases an optional part of an original image and facilitates specifying operation by moving spot light with which the original image is irradiated and specifying an erasure range. CONSTITUTION:An original placed on an original platen 2 is irradiated with the spot light from a spot light source composed of a light emitting element and a lens provided opposite the original platen 2, and this spot light is move to specify an erasure range. For example, when a dotted erasure range is specified, a speed specifying key 30h is operated firstly to set a high speed mode and operation keys 30b and 30c are operated to move the spot light source from a point Si to a point Sj nearby a point S1. Then, a low speed mode is set by operating a speed specifying key 30i and by operating the operation keys 30b and 30c to move the spot light source to the point S1 at a low speed. Similarly, the spot light source is moved from the point S1 to a point Sk nearby a diagonal point S2 and then moved to the point S2 at a low speed. A photosensitive drum is irradiated with the light corresponding to the specified erasure range to erase an electrostatic latent image or a charge, thereby forming an 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]

Generally, an electronic copying machine has a 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.

Furthermore, it would be convenient in practice if the erasure range of the original image could be specified easily and efficiently.

(Object of the invention) This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that can specify and erase any part of a document image and that allows easy specification operations.

[Summary of the invention]

This invention, for example, irradiates a spot light onto an original image, moves this spotlight to specify an erasing range, and irradiates a photoreceptor drum with light corresponding to the designated erasing range to form an electrostatic latent image. Alternatively, an image is formed by erasing the charge, and in particular, the moving speed of the spot light is selectively changed.

[Embodiments of the invention]

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

3 and 4 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. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document, and furthermore, a document cover 11 and a work table 12, which can be opened and closed, are provided near the document table 2. The original placed on the original platen 2 is moved by an optical system consisting of an exposure lamp 45 and mirrors 5, 6, 7 along 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 half the speed of the mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the above optical system,
That is, the light reflected from the original by the light irradiation of the exposure lamp 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 guided to the photoreceptor drum 10. An image of the original is formed on the surface of the photosensitive drum 10.

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charging device 11, and then the image is exposed to slit light, thereby forming an electrostatic latent image on the surface. This electrostatic 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, passes through the paper guide path 17 or 18, and then passes through the registration roller. versus 19
and guided to the transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the upper end of the right side of the main body 1, and are mounted on an operation panel to be described later.

You can choose one or the other. The cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 6 (h, 602). It is composed of a plurality of microswitches that are turned on and off accordingly.

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 photoreceptor drum 10 is transferred by the action of the capacitor 20. This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. And after establishment
The paper P is delivered to an 'I'-1 tray 25 outside the main body 1 by a pair of paper ejection rollers 24. Also, roll
.

The photographic photosensitive drum 10 is connected to a charger 26 for static elimination.
'Yo. Work removal Yo 8 end 1, -t2□゛1 table. Residual bacteria - □ The toner is removed and the residual image is erased by the static eliminating lamp 28, thereby returning to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising. “, 5th
The figure shows an operation panel 30 provided on the main body 1. 301 is a copy key for commanding the start of copying, 302. is a numeric keypad for setting the number of copies, etc.; a display section that displays the operating status of each part of the 303, paper jams, etc.;
304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14;

305 is a cassette display section for displaying the selected cassette; 30B is a magnification setting key for setting the enlargement/reduction ratio for copying in a predetermined relationship; 307 is a zoom key for steplessly setting the enlargement/reduction ratio; 30g is for setting a display section for displaying the magnification, 309 a density setting section for setting the copy density;
3 a, 30b, 30c, and 30d are operation keys for moving a spot light source indicating the erasing position of the original, which will be described later;
0e is a position specification key for inputting the coordinate position indicated by the spot light source, 30f and 30Q are erase range specification keys for specifying the erase range at the specified position, 30h, 30
Reference numeral 1 designates a speed designation key for selectively designating the moving speed of the spot light source as high or low, and 30j and 30 designate light emitting elements that display that the speed designation keys 30h and 30i have been operated, respectively.

FIG. 6 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 performing magnification change.

A mirror motor 32 is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification. , 33 is a scanning motor;
This is a motor for moving the exposure lamp 4, mirror 5, and mirror 6.7 for document scanning. 34
A shutter motor is a motor for moving a shutter (not shown) for adjusting the charging width of the photoreceptor 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. 3
A fixing motor 7 is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. 38 is a paper feed motor, which is connected to the feed row 515,
This is a motor for driving 16. A paper feeding motor 39 is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 7 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are connected to the first carriage 41! The mirrors 6, 7 are each supported by a second carriage 422, and these carriages 411, 412 are guided by guide rails 421, 422 and are movable in parallel in the direction of arrow a. That is, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the fiddle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, the guide portion 46 of the second carriage 422 supporting the mirror 6.7 has an I.
Two pulleys 47.47 are rotatably provided between the two pulleys 47.47, and a wire 48 is stretched between these pulleys 47.47. One end of this wire 48 is connected to four fixed parts,
The other ends are fixed to the fixing portions 49 via coil springs 50, respectively. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48.

Therefore, by rotating the pulse motor 33,
The belt 45 rotates and the first carriage 411 moves,
Accordingly, the second carriage 422 also moves. At this time, since the pulleys 47 and 47 act as movable pulleys,
The second carriage 422 moves in the same direction as the first carriage 411 at 1/2 the speed.

Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotational direction of the pulse motor 33. Furthermore, the copyable range corresponding to the specified paper is displayed on the document table 2. That is, the paper selection key 304
Let the paper size specified by (PxSPy) be,
If the copy magnification specified by the magnification setting keys 30g and 307 is K, then the copyable range (x, y),
x/KJ.

It becomes "y-Py/K". This copyable range (X, y)
In the X direction, a pointer 51 provided on the back side of the document table 2
．． 52, and the X direction is indicated by a scale 53 provided on the upper surface of the first carriage 411.

As shown in FIG. 8, the above-mentioned pointers 51 and 52
．． 55 via a spring 56. The pulley 55 is connected to a motor 58
It is designed to be rotated by walking, and this motor 58
The distance between the hands 51 and 52 can be changed by rotating the hands according to the paper size and magnification.

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

FIG. 9 shows the overall control circuit, in which the main processor group 71 and the first . It is mainly composed of a second sub-processor group 72 and 73. The main processor group 71 is
An operation panel 308 and various switches and sensors, such as a high-voltage transformer 76 that detects input from input devices 75 such as the cassette size detection switches 601 and 602 and drives the various chargers, the neutralization lamp 28, and the blade of the cleaner 27. The solenoid 27a, the heater 23a1 of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40.58 are controlled to perform the above-described copying operation, and the spot light [131, pulse motor 135, memory 140] , the erasing array 150, the array driving section 160, etc., to perform an operation of erasing unnecessary portions of the document. Note that the spot light source 131, pulse motor 135, erasing array 150, array driving section 160, and memory 140 will be briefly described.

Among the above motors 31 to 40.58, motor 35.37
．． 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-processor group 72 via a pulse motor driver 79, and the motors 36, 39, 38, 58
is controlled by the second sub-processor group 73 via the pulse motor driver 80. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. The main processor group 71 to the first and second sub-processor groups 72.7
Drive and stop commands for each motor are sent to the first motor. Second
From sub-processor group 72 and 73 to main processor group 7
1, a status signal indicating the driving or stopping state of each motor is sent. The first sub-processor group 72 also includes a position sensor 83 that detects each initial position of the motors 31 to 34.
Location information has been entered from.

FIG. 10 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 detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Also, microcomputer 91
is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93, and the input/output boat 94. for
A size switch for detecting one paper size and other inputs are connected, and a copying condition setting switch and other inputs are connected to the input/output port 95. Note that the input/output port 96 is for an option.

FIG. 11 shows an example of the configuration of the first sub-processor group 72.
1. In other words, 101 is a microcomputer
.

□ and is connected to the main processor group 71.
.

Ru. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor; I D>
10111”smTlflitfit! 9 F,
8tl-6Z ■, the count is based on that, and when the count is out, the end pulse is sent to the microcomputer 1.
Output to the 01 interrupt line. A reference clock pulse is input to the timer 02. Furthermore, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output ports 103 and 104. The input/output port 104 is connected to the motors 31 to 34 through the pulse motor driver 79.
135 is connected. In addition, the above input/output port 10
3 is used when outputting the status signal of each pulse motor to the main processor group 71, etc.

FIG. 12 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

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

Figure 13 shows the control circuit of the pulse motor, and shows the input/output port 121 (input/output port 1 in Figures 11 and 12).
04.114) has a pulse motor driver 122
(corresponding to the pulse motor drivers 79 and 80 in FIG. 9) are connected, and the pulse motor 1 is connected to this pulse motor driver 122.
23 (the pulse motors 31 to 34, 36, 38, 39
) each winding ASBST.

■ is connected.

Figure 14 shows a method for controlling the speed 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 becomes longer again, and then stops. That is, this indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, tl, t2・
...tx indicates the time of the phase switching interval.

Next, the document image erasing means will be explained.

In FIGS. 15 and 16, a guide shaft 130 is provided in the first carriage 411 along the lamp 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 has a guide shaft 130 with which the erasing range of the document is set. Spot light source 1 as a means of giving instructions
31 is movably provided. This spot light fi
As shown in FIG. 16, reference numeral 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 transmitted through the 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 the guide shaft 13.
The hook is passed between a timing belt (toothed belt) pulley 136 and a driven pulley 137, which are disposed along the line 0. Therefore, by rotating the pulse motor 135, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 411. Further, a position sensor 138 consisting of a micro switch for detecting the initial position of the spot light source 131 is provided on the first gear 411 located at the end of the guide shaft 130 on the pulse motor 135 side. For example, spot light source 13
1 is moved, the spot light source 131 first comes into contact with the position sensor 138 and the initial position is detected.

Next, using FIGS. 17 to 19, the spot light w
A method of specifying the erasing range of a document using 131 will be explained. This spot light source 131 is moved with the light emitting element 132 turned on by operating the operation keys 308 to 30d described above while the main processor group 71, which will be described later, is in the document erasure range designation mode. That is, when the operation keys 30b and 30d are pressed, the motor 33
is driven, and the first carriage 411 and spot light source 131 are moved in the scanning direction (arrow y direction shown in FIG. 17). Further, when the operation keys 30a and 30c are pressed, the motor 135 is driven, and the spot light source 131 is moved in a direction perpendicular to the scanning direction (in the direction of arrow X shown in FIG. 17). The operator operates the operation keys 308 to 30d while visually observing the spot light transmitted through the document G, and presses the position designation key 30e after moving the spotlight to 81 points on the document G shown in FIG. 18 (a>), for example. is pressed. Then, the coordinate position specified by this Sl is stored in the main processor group 71 shown in FIG. and 8
The positions of the two points are stored in the main processor group 71. The position of this spot light is determined by a pulse motor 33.13, for example.
This can be detected by counting the number of drive pulses. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) with 81.32 points as diagonal points is designated as the erasure range, as shown in FIG. 18(a). In addition, as shown in FIG. 18(b), 83 points of manuscript G,
Specify 84 points and press the erase range specification key 30Q.
:I, the area other than the square with 84 points as diagonal points is designated as the erasing range. In this way, when the erasure range designation keys 30f and 30o are pressed, the main processor group 71 performs calculations based on the positions of the two designated points and the copy magnification, and the memory 140 stores a high level signal in the erasure range. "1", and a low level signal "O" is stored in the other parts.

That is, this memory 140 is constituted by a RAM whose capacity in each column direction is approximately equal to the movement distance of the spot light source 131 in the X direction divided by the position resolution in the y force direction, and is , in the case of FIG. 18(a), as shown in FIG. 19(a), and in the case of FIG. 18(b), as shown in FIG.
As shown in Figure (b), high level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses.

In this case, the original is set with the copy side facing up,
After the erasure range has been specified, the document is turned over along the fixed scale 21 of the document table 2. Therefore, as shown in FIG. 19, the information stored in the memory 140 is also actually inverted in the column direction.

On the other hand, as shown in FIG. 20, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section Ph. As shown in FIGS. 21 and 22, this erasing array 150 has a plurality of light-shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and each of the light-shielding cells 151 has a A light emitting element 152 made of a light emitting diode, for example, as shown in FIGS. 23(a) and 23(b) is provided. Further, the light from the light emitting element 152 is transmitted to the opening of each cell 151 facing the photoreceptor drum 10.
A lens 153 is provided to condense light on the surface. 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, the distance between the light emitting elements 152 is P, and the number is N.
The total length of each left droplet removal array 150 is Q-NXP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 24, this array driving section 160 includes a shift register 161 having the same number of pits as the number of pits in the column direction of the memory 140, and a store register 1 in which the contents of this shift register 161 are held.
62, 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 contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are grounded. Each of the light emitting elements 152 constituting the erasing array 150 is connected to each cathode. The anode of each of these light emitting elements 152 is connected to the voltage 2IvCC via a current limiting resistor R, respectively.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 301 is pressed, the first carriage 41x and the photosensitive drum 10 are operated, and the memory 140 is also One column of data is sequentially read out (shown in FIG. 19). This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK.

After one column of data is transferred to the shift register 161, the charged portion of the photoreceptor drum 10 is transferred to the erase array 15.
When it reaches 0, the main processor group 71 outputs a latch signal LT)-1, which is supplied to the shift register 162 in response to this signal.

That is, the erase array 150 includes the charger 11 and the exposure section Ph.
For example, one row of data output from the memory 140 is arranged between the erase array 15 and
The angle between 0 and the exposed part Ph is θ! and the photoreceptor drum 10
is rotating at each speed, the latch signal @LT is supplied to the store register 162 before θ1/ω.
The output timing of H is controlled.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output L/H/L 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 162 is on, and are turned off when the switch element 162 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, in the same manner, the memory 140
The data is read out one column at a time, and the image is erased.

Next, the gist of the invention will be explained. If one of the speed designation keys 30h, 301 is operated and the operation keys 308 to 30d are operated, the spot light source can be moved at the selected speed. For example, when specifying an erasing range as shown by the dotted line in FIG. 1, if the spot light source 131 is at point 3i, first operate the speed specification key 30h to enter the high speed mode. Then, by operating the operation keys 30b and 30c, the spot light source 131 can be moved at high speed from point Si to point Sj near point S1. Thereafter, by operating the speed designation key 301 to set the mode to low speed and operating the operation keys 30b and 30c, the spot light source 131 can be moved from the vicinity Sj to Sl at a low speed. Similarly, speed specification key 3
Operate 0h to set high speed mode, and use operation keys 30G, 30
By operating d, the spot light source 131 changes from 81 points to 82 points.
It is possible to move to the vicinity of the point Sk at high speed. After this,
By operating the speed designation key 30i to set the low speed mode and operating the operation keys 30c and 30d, the spot light source 131 can be moved from the vicinity Sk to the 82 points at a low speed.

FIG. 2 shows the moving speed of the spot light source 131 corresponding to the operation of the speed designation keys 30h and 30i. Here, when the speed designation keys 30h, 30i are operated, the main processor group 71 is set to a high speed drive mode or a low speed drive mode, and the first and second sub processor groups 72, 73 are set according to each of these modes. A speed control signal is supplied to the The pulse motors 33, 135 are controlled in the first and second sub-processor groups 72, 73 to move the spot light source 131 at a predetermined speed.

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. Moreover, by changing the operating force of the operating keys 308 to 30d, the moving speed of the spotlight can be changed.

Therefore, for example, when specifying an erasure range, the spotlight can be moved at high speed until it reaches the vicinity of the specified diagonal point, and then at a low speed after moving near the diagonal point. It is possible to move the spotlight efficiently and quickly move the spotlight to a specified desired position.

Next, other embodiments of the invention will be described.

In the above embodiment, the moving speed of the spot light is in two stages, but it is also possible to set it in multiple stages. FIG. 25 shows an example. That is, the operation panel 30 is provided with a speed designation key 301 and a speed display section 30m consisting of a plurality of light emitting elements.
The speed can be changed each time you operate . In other words, the main processor group 71 is normally in the high speed mode, and is switched to the low speed mode each time the speed designation key 301 is operated. When 301 is operated, the high speed mode is set again. Further, the speed display section 30m is connected to a speed designation key 301.
Each time the key 301 is operated, the lights are sequentially switched from left to right in the figure, and when the rightmost one is lit, the leftmost one is lit again in response to the next operation of the speed designation key 301.

In such a configuration, if the main processor group 71 outputs a speed control signal according to the speed designation key 301, it becomes possible to move the spotlight at a desired speed. Even with such a configuration, it is possible to obtain the same effects as in the above embodiment.

FIG. 26 shows yet another embodiment of the invention. The operation panel 30 has the speed designation keys 30h, 30.
In addition to 11 light emitting elements 30j and 30, check key 30n
By operating this check key 30n, the specified erasing range can be displayed using a spot light source. That is, the operation key 30
8~30d, place 1 designation-1-30eeli'l'l':
1m, fx.

When the selection key 30n is operated, the specified erasure range is displayed. In other words, when you operate check key 30n,
The main processor group 71 operates the first carriage 411 and the spot light source 1 according to the stored coordinate position of the spot light.
31 is driven.

For example, the specified erasing range is 3 as shown in FIG.
1 (Xi, Yl), S2 (X2, V2
), first the spot light source 131 is moved to the stored coordinate position S1 (×1, yl), and in the state where the spot light source 131 is moved to this coordinate position S1, the light emitting element 132 is sent from the main processor group 71. A lighting signal is supplied and this is turned on. In this state, the first carriage 411° spot light source 131 is driven,
The spotlight is moved according to the arrow shown in FIG.

That is, first, only the spot light source 131 is driven to emit spot light from the coordinate position 81 (XI, Vl) to (X2,
'Six), and then the first carriage 41
1 is driven and the spot light reaches the coordinate position (x2, yl
) to coordinate position 82 (X2, V2). Roughly, only the spot light source 131 is driven again and the spot light is moved to the coordinate position (x1, y2),
Finally, only the first carriage 411 is driven to move the spot light from the coordinate position (Xl, V2) to the previous coordinate position S.
t (Xt, yl). In this way, the erase range is displayed, and the spot light source 131 is located at the coordinate position S.
When the value reaches 1, the light emitting element 1.32 is turned off.

In the above-described checking operation, when the speed designation key 30h or 30i is operated, the moving speed of the spotlight is switched between high speed and low speed. By being able to switch the movement speed as desired,
This allows the erasure range to be confirmed reliably.

In addition, if multiple erasure ranges are specified, when the display of one erasure range is finished, the spot light source 131 is moved to another specified coordinate position, and the erasure range is displayed by the same operation as above. It looks like this.

Note that this invention is not limited to the above embodiments.

For example, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 20, but as shown in FIG. Exposure section Ph and developing device 1
2, and the formed electrostatic latent image can be erased according to a designation.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to designate and erase any part of a document image, and to provide an image forming apparatus in which the designation operation is easy.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention, and is a plan view of the main part showing an example of an erasing range designation operation, and FIG. 2 shows the operation of the speed designation key and the moving speed of the spot light. 3 and 4 are diagrams showing the structure of the image forming apparatus. FIG. 3 is an external perspective view, FIG. 4 is a side sectional view, and FIG. 5 is an operation diagram. FIG. 6 is a plan view showing the structure of the panel, FIG. 6 is a perspective view 1 showing the structure of the drive section, FIG. 7 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. 8 is a schematic view of the drive mechanism of the pointer. 9 is a perspective view showing the overall control circuit, FIG. 10 is a configuration diagram of the main processor group, FIG. 11 is a configuration diagram of the first sub-processor group, and FIG. 12 is a configuration diagram of the second sub-processor group. Configuration diagram of processor group, 13th
The figure is a schematic configuration diagram showing the control circuit of the pulse motor, No. 14.
The figure is a diagram to explain the speed control method of a pulse motor.
Fig. 15 is a perspective view of the main part showing the spot light source, Fig. 16 is a side sectional view of the main part showing the spot light source, and Figs. 17 and 18 respectively show the operation of specifying the erasing range of the document using the spot light source. FIG. 19 is a plan view for explaining the contents of the memory, FIG. 20 is a side sectional view of the main part showing the arrangement of the erase array, and FIGS. 21 and 22 are the erase arrays. Fig. 21 is a perspective view showing only the main parts, Fig. 22 is a front view showing only the main parts, and Fig. 23 shows the configuration of the erasing array. Figure (a) is a side sectional view, Figure (b) is a partially cutaway front view, Figure 24 is a circuit diagram showing the configuration of the array drive section, and Figures 25 to 27 are each according to the present invention. 25 and 26 are plan views showing the configuration of the operation panel, respectively, and FIG. 27 is a plan view of the main parts shown for explaining the erase range checking operation. FIG. 28 is a side sectional view of the main parts showing another example of the arrangement of the erasing array. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 30...Operation panel, 30a-30d...Operation keys, 30e...Position specification key, 10...Photosensitive drum, 30h, 30i
, 301... Speed specification key, 71-... Main processor group, 131... Spot light source, 132... Light emitting element, 133... Lens, 135... Pulse motor, 140... Memory, 150... Erasing array, 15
2... Light emitting element j, 153... Lens, 160...
Array drive unit, P...paper, Ph...exposure unit. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 6 Figure 8 F''-1 %wl Figure 16 d Figure 17 Figure 18 (a) Figure 18 Figure 19 (a) (b) Figure 20 Figure 28 Figure 21 Figure 22 (a) (b)

Claims (2)

[Claims] (1) In an image forming apparatus that optically scans a document placed on a document table and transfers an image corresponding to the image of the document onto a transfer material, a predetermined area of the document is provided in the operating means and uses transmitted light to scan a predetermined area of the document. an instruction means for instructing, an erasing means for erasing an image corresponding to the specified range, an operation means for specifying a moving position of the instruction means, a speed specifying means for specifying a moving speed of the instruction means, An image forming apparatus comprising: a control means for controlling the moving speed of the instruction means in accordance with the designation of the speed designation means. (2) The image forming apparatus according to claim 1, wherein the instruction means is comprised of a light emitting element that is movable in a direction perpendicular to the moving direction of the operating means and irradiates the document with a spot light.