JPS6235381A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain a practically convenient image forming device by making the shape of transmitted light designating the necessary part of an original modifiable. CONSTITUTION:The shape of a spot light beam is modifiable in accordance with the function of each type. Namely, a spot light source 131 is provided with a pulse motor 170, and on its rotary shaft a disk-like display member 171 whose periphery is inserted between a light emitting element 132 and a lens 133 is installed. Thereon a circular through hole 172 small in diameter, a circular through hole 173 large in diameter, a line-shaped through hole 174 and an cross-shaped through hole 175 are provided with a specified interval on the periphery. If an original is erased under such a constitution, the cross shaped through hole 175 or the through hole 172 small in diameter on the display member 171, for instance, are positioned between the light emitting element 132 and the lens 133.

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 are cases where the original image includes unnecessary parts.

Recently, a copying machine that can selectively designate and erase this unnecessary portion is being developed. This copying machine specifies a desired portion of the document by, for example, irradiating a spot light onto the document, and erases the specified portion from the photosensitive drum during copying. By using this copying machine, it is possible to erase unnecessary parts of a document and copy it. Further, this copying machine can obtain functions such as forming an underline and filling in desired portions of the original image by using the original specifying means and the erasing means. However, since the spot light has only one type of shape, when using these various functions, there is a problem in that it is difficult to specify the position of the document using the spot light.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose is to provide a practically convenient image forming apparatus by making it possible to change the shape of transmitted light that specifies a desired portion of a document.

[Summary of the invention]

According to the present invention, the shape of a spot light source that irradiates a spotlight onto a document to specify a desired portion of the document can be changed in accordance with various functions.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 4 and 5 schematically show an image forming apparatus of the present invention, such as a copying machine. A document table (transparent glass) 2 for supporting a document is fixed to the top surface of the copying machine main body 1. 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 processed by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7.
Exposure scanning is performed by reciprocating in the direction of arrow a along the lower surface of document table 2. in this case,
Mirror 6.7 is 1/1/2 of mirror 5 to maintain the light exposure length.
It is moved at a speed of 2.

The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, and then passes through the variable magnification lens block 8. The light is reflected by the mirror 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 is rotated in the direction of arrow C in the figure, and first, the surface thereof is charged by the charging device 11. Thereafter, the image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by the developing device 12.

On the other hand, the paper (material to be transferred) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery row 515 or 16, and the taken out paper is taken out from the paper guide path 17 or 18 and is guided to a pair of registration rollers 19, and guided to a transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later.

The cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. The cassette size detection switches 601 and 602 are composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section is brought into close contact with the surface of the photosensitive drum 1o at the transfer charger 20, and
0, the toner image on the photosensitive drum 1o is transferred. The transferred paper P is electrostatically peeled off from the photosensitive drum 10 by the action of a peeling charger 21, and is sent by a conveyor belt 22 to a fixing roller 23 as a fixing device provided at the end thereof. The transferred image is fixed by passing through this, and the fixed paper P is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24 . Further, the photosensitive drum 1o after the transfer is transferred to a charger 2 for static electricity removal.
6, residual toner on the surface is removed by a cleaner 27, and afterimages are erased by a static elimination lamp 28, so that the initial state is restored. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 6 shows an operation panel 3o provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
Numeric keys are used to set the number of copies, etc.; 303 is a display unit that displays the operating status of each unit, paper jam, etc.; and 304 is an upper row.

30s is a cassette display section for displaying the selected cassette; 306 is a magnification setting key for setting the copy magnification and reduction magnification in a predetermined relationship; 307 is an enlargement; A zoom key for steplessly setting the reduction magnification, 308 a display section for displaying the set magnification, 30s a density setting section for setting the copy density,
30a, 30b, 30c, and 30d are operation keys for moving a spot light source indicating the erasing position of the document, which will be described later. 30e is a position designation key for inputting the coordinate position indicated by the spot light source. 30f and 30G are operation keys for each specified position. Erase range specification key to specify the erase range, 30h is an underline key to specify underline formation,
30i is a fill key that specifies filling of the document.

FIG. 7 shows an example of the drive source configuration of each drive unit for copying 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. 32 is a mirror motor;
This is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification.

A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. 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 is a drum motor, which is a motor for driving the photosensitive drum 10. Reference numeral 37 denotes a fixing motor, which is a motor for driving the paper conveyance path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24.

38 is a paper feed motor, and the feed roller 15, 16
This is a motor for driving. 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. 8 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, respectively, and these carriages 411 and 412 are guided by guide rails 421 and 422 in the direction of arrow a. It is said to be able to move in parallel. Further, the four-phase pulse motor 33 drives a pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, the second mirror supporting mirror 6.7
Two pulleys 47.47 are rotatably provided on the guide portion 46 of the carriage 422, spaced apart in the axial direction of the rail 422, and a wire 48 is connected between these pulleys 47.47.
is being handed over. One end of this wire 48 is a fixed part 49
The other ends are respectively fixed to the fixing portions 49 via coil springs 50. In addition, the wire 48
One end of the first carriage 411 is fixed in the middle. Therefore, by rotating the pulse motor 33, the belt 45 rotates and the first carriage 411 is moved, and the second carriage 422 is also moved accordingly. At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage 422 is moved 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.

The paper size specified by the key 304 (PxlP
y) and the copying magnification specified by the magnification setting keys 30s and 307 is K. (1) Copyable range (X, 'j>, [x-Px/Kl.

r'i'-PV/KJ. This copyable range (X,
y), the X direction is indicated by the pointers 51 and 52 provided on the back surface of the document table 2, and the y direction is indicated by the scale 53 provided on the top surface of the first carriage 411. ing.

As shown in FIG. 9, the above-mentioned pointers 51.
55 via a spring 56. The pulley 55 is rotated by a motor 58, and by driving the rotation of the motor 58 according to the paper size and magnification, the distance between the pointers 51 and 52 can be changed. There is.

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. When the copy key 301 is pressed, the first carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 41
1 is returned to the home position.

FIG. 10 shows the overall control circuit.

The main processor group 71 detects inputs from the operation panel 30 and input devices 75 such as various switches and sensors, for example, the cassette size detection switches 601 and 602, and includes a high-voltage transformer 76 that drives the various chargers, and the static elimination lamp. 28, the blade solenoid 27a of the cleaner 27, the heater 23a1 of the fixing roller pair 23, the exposure lamp 4, and each of the motors 31 to 40.58
In addition to controlling the spot light source 131, pulse motor 135, 170, memory 1401 erasing array 150, array drive unit 160, etc., it performs the operation of erasing the original image of the original, and performs the copying operation described above. It performs the operation of forming an underline at an arbitrary position and the operation of filling in the original. In addition, spot light 11i1
31, pulse motor 135.170, erase array 150
, the array driver 160, and the memory 140 will be described later.

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.
．． 170 is controlled by the first sub-processor group 72 via the pulse motor driver 79, and the motor 36.39.3
8.58 is controlled by the second sub-processor group 73 via the pulse motor driver 8o. In addition, 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. Then, from the main processor group 71, the first. Commands to drive and stop each motor are sent to the second sub-processor group 72, 73, and the first. A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72, 73 to the main processor group 71. In addition, the first sub-processor group 72
Inputs position information from a position sensor 83 that detects each initial position of the motors 31 to 34.

FIG. 11 shows an example of the configuration of the main processor group 71. One-chip microcomputer 91 (hereinafter referred to as
The microcomputer (simply referred to as a microcomputer) detects human power on keys on an operation panel (not shown) and performs various display controls via an input/output board 92.

Furthermore, the 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.
A size switch for detecting paper size and other inputs are connected to 4, and a copying condition setting switch and other inputs are connected to input/output port 95. Note that the input/output port 96 is an option.

FIG. 12 shows an example of the configuration of the first sub-processor group 72. The microcomputer 101 is the main processor group 7
1 is connected. Programmable interval
The timer 102 controls the phase switching interval time of the pulse motor. When a setting value is set from the microcomputer 101, the timer 102 starts counting O-clock pulses based on the reference value. When the timer 102 is counted out, the end pulse is sent to the microcomputer 101. It is designed to output to the interrupt line. The microcomputer 101 also includes the position sensor 8.
Position information from 3 is input, and input/output boats 103 and 104 are connected. The input/output boat 104 is connected to the motors 31 to 34, 135, and 170 via the pulse motor driver 79. The input/output board 103 is used, for example, to output status signals of each pulse motor to the main processor group 71.

FIG. 13 shows the configuration of the second sub-processor group 73. The microcomputer 111 is connected to the main processor group 71
is connected to. The programmable interval timer 112 controls the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 111, it starts counting reference clock pulses based on it, and when the count is out, it starts counting the end pulse. It is designed to be output. 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 boat 114 is connected to the microcomputer 111, and this input/output boat 114 is connected to the pulse motor driver 8.
A motor 36.38.39.58 is connected via o.

Figure 14 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in FIGS. 12 and 13) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 10) is connected to the pulse motor driver 122.
6.38.39) are connected.

FIG. 15 shows a method of controlling the speed of a pulse motor, in which (a) shows the speed curve of the pulse motor, and (b) shows the phase switching interval.

As is clear from this figure, the phase switching interval is good at first;
They gradually shorten, then become evenly spaced, then gradually lengthen again, and then stop. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. Furthermore, 1. , t2...tx indicate the time of the phase switching interval.

Next, the document image erasing means will be explained.

In FIG. 16, the first carriage 411 includes a lamp 4.
A guide shaft 130 is inserted along the lamp 4 in the part where the light is blocked.
A spot light II! is provided on the guide shaft 130 as a means for indicating the erasing range of the document. 131 is movably provided.

As shown in FIG. 1, which will be described in detail later, this spot light source 131 consists of 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 is irradiated onto the document table 2 as a spot light by a lens 133. 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. Also, spot light! 131 is a timing belt (
(toothed belt) 134. This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of a pulse motor 135 and a driven pulley 137. Therefore, by rotating the pulse motor 135, the spot light +1Pt131 is moved in a direction perpendicular to the scanning direction of the first carriage 411. Also,
The first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side is equipped with a position sensor 13 consisting of a microswitch that detects the initial position of the spot light source 131.
8 is provided. For example, the 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, a method for specifying the erasing range of a document using the spot light source 131 will be described with reference to FIGS. 17 to 19. This spot light source 131 is the operation key 30a.
When ~30d is operated, the light emitting element 132 is moved in a lit state. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spotlight rA131 are moved in the scanning direction (arrow y direction shown in FIG. 17). In addition, the operation keys 30a, 30
When c is pressed, the motor 135 is driven and the spot light source 1
31 is perpendicular to the scanning direction (arrow X shown in FIG.
direction). The operator operates the operation keys 308 to 30d while visually observing the spot light transmitted through the document G. For example, after moving the spotlight to point S1 on the document G shown in FIG. is pressed.Then, the coordinate position specified by this Sr is stored in the main processor group 71 shown in FIG. The positions of the 82 points are stored in the main processor group 71.The position of this spotlight is determined by the pulse motor 33, for example.
．． This can be detected by counting the number of 135 drive pulses. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) having the 82nd point Sr as the diagonal point is designated as the erasure range, as shown in FIG. 18(a). Also, as shown in FIG. 18(b), if you specify points 83 and 84 on the original G and press the erase range designation key 30q, the area other than the square with 83 and 84 points as diagonal points will be erased as the erase range. It is specified. In this way, when the erasing range designation keys 30f and 30G are pressed, the main processor group 71 performs calculations based on the positions of the two specified points and the copying magnification, and the memory 140 stores a high level signal in the erasing range. ``1'', low level signal ``0'' in other parts
°′ is memorized. That is, this memory 140 is constituted by, for example, a RAM whose capacity in each column direction is approximately equal to the moving distance of the spotlight rA 131 in the X direction divided by the position resolution in the y direction. , in the case of Fig. 18(a), the first
As shown in FIG. 9(a), and in the case of FIG. 18(b), as shown in FIG. 19(b), a high level signal is sent to the address corresponding to the shaded area, and a low level signal is sent to the other addresses. The signal is now memorized.

In this case, the original is set with the copy side facing up, and after the erasure range is specified, it is turned over along the fixed scale 21 of the original 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 light shielding cell 151 has a plurality of light shielding cells 151 arranged therein in a direction perpendicular to the rotational direction of the photoreceptor drum 10. A light emitting element 152 made of, for example, a light emitting diode as shown in FIG. 23 (a>(b)) 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 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. 24, this array driving section 160 includes a shift register 161 having the same number of bits as the number of bits in the column direction of the memory 140, and a store register 16 in which the contents of this shift register 161 are held.
2. A switch circuit 16 consisting of a plurality of switch elements 163 that are turned on and off by each output signal of the store register 162.
4, and these switch elements 163
The movable contact pieces 163a are grounded, and the fixed contacts 163b are connected to the light emitting elements 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 limiting resistors 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 41t and the photosensitive drum 10 are operated, and the memory 140 is moved in the row direction. 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 the value reaches 0, the main processor group 71 outputs a latch signal LTH, and the data stored in the shift register 161 is supplied to the store 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 150 and
If the angle of the exposure part Ph is θ1 and the photosensitive drum 10 is rotating at each speed, the latch signal LTH is set so that it is supplied to the store register 162 before θ1/ω.
output timing 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 level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are lit when the switch element 163 is on.

When off, the light is turned off. Therefore, the photosensitive drum 10
Of the charged portions, the portion where the light emitting element 152 is turned on is neutralized, and static Nm@ is not formed in this neutralized portion even if it is subsequently exposed, which means that the document image has been erased. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Further, by using the spot light source 131, the erasing array 150, and the array driving section 160, it is possible to form an underline in a desired portion of the document or fill in a desired portion of the document with toner. To form these underlines and fill in the document, first operate the underline key 30h1 or the fill key 30i on the operation panel 30, and in this state, use the spot light source 131 as shown in FIGS. 25(a) and 25(b). As shown in the figure, the underline formation position and filling position are specified. Thereafter, in response to the operation of the copy key 301, for example, a normal copying operation is performed, and the original image is copied onto paper. The copied paper is set in the feeding cassette again, for example, by the operator. Next, when the copy key 301 is operated again, the set paper is fed and the light emitting elements 15 in the erasing array 150
2, only the light emitting elements 152 other than the portion corresponding to the designated position are lit in response to n-light scanning of the document. Therefore, the document image in the portion where the light emitting element 152 is lit is erased, and the light emitting element 1
As shown in FIG. 26(a), an underline is formed corresponding to the portion where 52 was turned off, and an underline is formed as shown in FIG.
As shown in b), the original image is filled in.

Note that the filling width of the original image can be changed. Also,
Details of these underline forming operations and document image filling operations are disclosed in Japanese Patent Application No. 60-56533 and Japanese Patent Application No. 1983.
-65240.

Next, the gist of the invention will be explained.

In this invention, the shape of the spot light can be changed according to various functions. That is, as shown in FIG.
A disc-shaped display member 171 whose peripheral edge is inserted between the light emitting element 132 and the lens 133 is provided on the rotating shaft of the motor 170.

As shown in FIG. 2, this display member 171 has a circular through hole 172 with a small diameter, a circular through hole 173 with a large diameter, a minus-shaped through hole 174, and a plus-shaped through hole at its periphery. 175 are provided at predetermined intervals. In such a configuration, for example, when erasing the original as described above, the operation keys 308 to 30d of the operation panel 30 are pressed.
When is operated, the motor 170 is rotated, and for example, the plus-shaped through hole 175 of the display member 171 or the small diameter through hole 172 are connected to the light emitting element 132 and the lens 133.
located between each other. At this time, the light emitting element 132
is in a lit state, the document is illuminated with a plus-shaped spot light Sp1 as shown in FIG.
), a spot light Sp having a small diameter is irradiated, and in this state, the above-mentioned erasing range is specified.

Further, when the underline key 30h is operated,
The motor 170 is driven, and the minus-shaped through hole 174 of the display member 171 is inserted between the light emitting element 132 and the lens 133. For this reason, the original IG is irradiated with a minus-shaped spot light Sp, as shown in FIG. 4C, and in this state, the underline formation position is specified.

Furthermore, when the fill-in key 30i is operated, the motor 170 is driven, and the large-diameter through hole 173 of the display member 171 is inserted between the light emitting element 132 and the lens 133. Therefore, as shown in FIG. 2D, the document G is irradiated with a spot light Sp having a large diameter, and in this state, the filled position of the document is specified.

According to the above embodiment, the shape of the spot light can be changed according to various functions. Therefore, it is possible to use a spot light with an optimal shape corresponding to each function, so it is possible to reliably perform a position specification operation corresponding to the function, and it also has the advantage of making it easier to recognize the specified position. have.

Further, the shape of the spotlight is automatically changed when keys for setting various functions are operated, so that operability is good.

Furthermore, since the shape of the spot light can be changed with a simple configuration in which the display member 171 is rotated by the pulse motor 17, it is possible to suppress an increase in the size of the device.

Note that this invention is not limited to the above embodiments,
For example, the shape of the spot light can be changed in various ways other than those described above.

Furthermore, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 20, but as shown in FIG. It is also possible to configure the data to be erased by

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 provide a practically convenient image forming apparatus by making it possible to change the shape of transmitted light that specifies a desired portion of a document.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention, in which a side sectional view of the main part showing a spot light source, FIG. 2 a plan view showing the configuration of a display member, and FIG. 3 a spot light source. Figures 4 and 5 shown to explain the shape of light show the configuration of the image forming apparatus. Figure 4 is an external perspective view, Figure 5 is a side sectional view, and Figure 6 is a FIG. 7 is a plan view showing the structure of the operation panel, FIG. 7 is a perspective view showing the structure of the drive unit, FIG. 8 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. 9 is a schematic view of the drive mechanism of the pointer. 10 is a configuration diagram showing the overall control circuit, FIG. 11 is a configuration diagram of the main processor group, FIG. 12 is a configuration diagram of the first sub-processor group, and FIG. 13 is a configuration diagram of the second sub-processor group. A configuration diagram of the processor group, Figure 14 is a schematic configuration diagram showing the control circuit of the pulse motor, Figure 15 is a diagram for explaining the speed control method of the pulse motor, and Figure 16 is a diagram of the main parts showing the spot light source. A perspective view, FIGS. 17 and 18 are plan views for explaining the erasing range designation operation of a document using a spot light source, respectively. FIG. 19 is a diagram for explaining the contents of the memory, and FIG. 20. 21 and 2 are side sectional views of main parts showing the arrangement of the erase array.
Figure 2 shows the relationship between the erasing array and the photosensitive drum, Figure 21 is a perspective view showing only the main parts, and Figure 22 is a perspective view showing only the main parts.
The figure is a front view showing only the main parts, and FIG. 23 shows the configuration of the erasing array.
) is a partially cutaway front view, FIG. 24 is a circuit diagram showing the configuration of the array drive section, factor 25 and FIG. 26 are diagrams shown to explain the operations of various functions, respectively, and FIG. 27 FIG. 3 is a side sectional view of a main part showing another example of the arrangement of the erasing array. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 10...Photosensitive drum, 30...Operation panel, 308-30d...Operation key, 30e...Position specification key, 30f130Gl.
...Erase range specification key, 30i1...Underline key, 30i...Fill key, 71...Main processor group, 131...Spot light source, 132...
...Light emitting element, 133...Lens, 135...
Pulse motor, 140... Memory, 150... Erasing array, 152... Light emitting element, 153... Lens,
160... Array drive unit, 170... Pulse motor, 171... Display member, 172-175... Through hole,
P... Paper, Ph... Exposure section. Figure 1 Figure 2 Figure 13 Figure 14 Figure 17 Figure 18 (b) Figure 18 (a) (b) Figure 20 Figure 27 Figure 21 (a) (b) a)

Claims (3)

[Claims] (1) A scanning device that optically scans a document placed on a document table; an optical system that forms an optical image obtained by the scanning device onto a charged image carrier; and the image carrier. In an image forming apparatus comprising a developing means for developing an image formed on a body, and a transfer means for transferring the developed image onto a transfer material, an image forming apparatus is provided in the scanning means to indicate a predetermined area of the document using transmitted light. and an erasing means for erasing an image corresponding to the specified range during image formation, the image forming apparatus being characterized in that the shape of the transmitted light can be changed as required. (2) The image forming apparatus according to claim 1, wherein the instruction means comprises a light emitting element that is movable in a direction perpendicular to the direction of movement of the scanning means and irradiates the document with a spot light. (3) The image forming apparatus according to claim 1, wherein the erasing means comprises a plurality of light emitting elements arranged along the longitudinal direction of the image carrier.