JPS61223861A - Image forming device - Google Patents

Abstract

PURPOSE:To quickly designate an original image erasing extent, by starting the designation of the erasing extent by moving a spot light near the center of an extent capable of copying. CONSTITUTION:When operation keys 30b and 30d are depressed, a carriage 411 and spot light source 131 move in the scanning direction and when operation keys 30a and 30c are depressed, the spot light source 131 moves in the direction normal to the scanning direction. When either one of the operation keys 30a-30d is operated, the spot light source 131 first moves to a position near the center of an extent (x, y) capable of copying. By operating the operation keys 30a-30d while visually watching the spot light passed through an original G, the spot light is moved to points S1 and S2 on the original G and, by depressing a position designating key 30e, positions of the points S1 and S2 are stored, and then, by depressing an erasing extent designating key 30f, a rectangular area with the points S1 and S2 at its diagonal points is designated as an erasing extent.

Description

DETAILED DESCRIPTION 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.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that can designate and erase any part of a document image, and can quickly designate the erasing range.

[Summary of the invention]

In the invention, for example, a spot light is irradiated onto an original image, the spot light is moved to specify an erasing range, and a photosensitive drum is irradiated with light corresponding to the specified erasing range to erase the electrostatic potential. It erases the image or charge and makes a copy.
In particular, when specifying the erasure range, the first operation is to move the spotlight to approximately the center of the copyable range, and start specifying the erasure range from this position.

[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 set on the original platen 2 is exposed by an optical system consisting of an exposure lamp 4 and mirrors 5, 6.7 reciprocating along the lower surface of the original platen 2 in the direction of arrow a.
Exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at the same speed as mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the optical system and the light reflected from the original by the exposure lamp 4 are reflected by the mirrors 5, 6, and 71C, and then passed 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 100.

The photosensitive drum 10 rotates in the direction of arrow C, and its surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. 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 transferred from the selected upper paper feed cassette 13 or lower paper feed cassette 14 to the delivery row 2.
15 or 16, one sheet is taken out one by one, and the paper guide path 17
Alternatively, it is guided through 18 to a pair of registration rollers 19, and sent to a transfer section by this pair of rollers 19. Here, each of the paper feed cassettes 13 and 14 is
It is detachably provided at the lower right end of the main body 1, and either one can be selected in the operation panel A to be described later. Note that the paper feed cassettes 13 and 14 have their cassette and paper sizes detected by cassette size detection switches 601 and 601, respectively. These detection switches 601, 60. It is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes and trays of different sizes.

On the other hand, the paper P sent to the transfer section is brought into close contact with the surface of the photoreceptor drum 1o at the transfer charger 20.
The toner image on the photosensitive drum 10 is transferred by the action of the charger 2o. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the terminal end of the conveyor belt 22. By passing through this, the transferred image is fixed. Then, the paper P after fixing is
The paper is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24 . Further, after the photosensitive drum 1° has been transferred, the charge is removed by the charger 26, the residual toner on the surface is removed by the cleaner 27, and the residual image is erased by the charge removal lamp 28, so that the drum returns to its initial state. It has become. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 5 shows an operation panel 30 provided on the main body 1. sol is a copy key that commands the start of copying, 302
303 is a numeric keypad used to set the number of copies, etc.; 303 is a display unit that displays the operating status of each part and paper jams; and 304
is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 301+ is a cassette display section for displaying the selected cassette; 306 is a magnification setting key for setting copy enlargement and reduction magnification in a predetermined relationship; 307 30 is a display section that displays the set magnification, 309 is a density setting section that sets the copy density, and 30m, 30b + 30a, and 30d are the original document buttons that will be described later. 30e is an operation key for moving the spot light source indicating the erase position, and SOt is a position designation key for inputting the coordinate position indicated by the spot light source.

sog is an erasure range specification key that specifies the erasure range at each designated position.

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, numeral 3 is a lens motor, which is a motor for moving the position of the lens holder 8 for changing the magnification. Reference numeral 32 denotes a mirror motor for changing the distance (optical path length) between the Mi 2-5 and the Mini 7-e, v for zooming. 3
3 is a scanning motor that connects the exposure rung 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 transport path 22, the pair of fixing rollers 23, and the two pairs of paper discharge rows 24.

Reference numeral 38 denotes a paper feed motor, which is a motor for driving the delivery row 215.16. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the registration row Y pair 19ft. 40 is a 7-amp motor, which is connected to the cooling fan 2.
This is a motor for driving 9.

FIG. 7 shows a drive mechanism for reciprocating the optical system. That is, mirror 5 and exposure run 7
64 is supported by the first carriage 411, and the mirror 6.7 is supported by the second carriage, the carriage 41111C.
It is guided by and can freely move 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 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 carriage 41 supporting the mirror 6.7! Rail 42! The guide portion 46 of the rail 4
2! Two pulleys 47, 47 are rotatably provided apart from each other in the axial direction, and a wire 48 is stretched between these pulleys 4f, 4f. One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49Vc via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, the Nors motor 33 rotates -
The belt 45 rotates and the first carriage 41 violet moves due to F foot k, and the second carriage, ji 41! also move.

At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage, the second carriage 41!
move in the same direction at the speed of the rod. In addition, 1. Second
Kyari, Ji411.

The four directions of movement are controlled by switching the direction of rotation of the Noculus motor 330.

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 304 is set to (Px, Py), and the magnification setting key 306 is pressed.

If the copy magnification designated by 307 is K, the copyable range (x, y) is x = Px /K y = Py /. Of this copyable range (x, y), the X direction is indicated by a pointer 51° 52 provided on the back surface of the document table 2, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411. It is now displayed by.

The above guidelines 51 and 52 are as shown in Figure 8.
．． 55 via a spring 56. The pulley 55 is a motor ss
This motor 5 is designed to be rotated by K.
8 is driven in accordance with the paper size and magnification, the distance between the hands 51 and 52 can be changed.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) in order to display the copyable range by driving the motor 33 according to the paper size and magnification. There is. Then, when the copy key 301 is pressed, the first carrier 411 first
The second gear was moved in the direction of the 41st gear, and then the 4th gear.
is illuminated and moved in the direction away from the second carriage 412. When scanning of the original is completed, the land 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-process group 72 and 73. The main processor group 71 is
Operation/4' channel 30 and various switches and sensors, such as the cassette size detection switch 601.60. A high-voltage transformer 76 that detects inputs from input devices 75 such as, and drives the various chargers, the static elimination lamp 28, the platen lenoid 27a of the cleaner 27, the heater 23a of the fixing roller pair 23, the exposure run f4, and controls each of the motors 31 to 4o, 58, etc. to perform the above-described copying operation, and also controls the spot light source 131, 4o, 58, etc.
erase motor 135, erase array 150, array drive unit 1
60, the memory 140 and the like are controlled to erase unnecessary portions of the document. In addition, the spot light source 13 J, /
The armpit motor 135, erasing array 150, array driving section 160, and memory 140 will be described later.

Among the above motors 31 to 4o, 5B, 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 the Noculus motor driver 79, and the motors 36, 39.3g.

58 is controlled by the second subgroup 3 via the armature motor driver 80. In addition, exposure lamp 4
is controlled by the main processor group 71 via the rande regulator 81, and the heater 23h is controlled by the main processor group 71 via the heater control section 82. From the main processor group 21, the first. Commands to drive and stop each motor are sent to the second sub-processor group 72, 73, and the first. The second sub-grocer group 72, 73 sends the status indicating the drive/stop state of each motor to the main processor group 71. Furthermore, position information from the motor 31 is input to the first sub-processor group 72 .

FIG. 10 shows an example of the configuration of the main processor group 71. That is, numeral 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer) which detects human input from keys on an operation panel (not shown) and performs various display controls through an input/output port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96. A high voltage transformer 76, a motor dryer 76, a motor dryer 8, and other outputs are connected to the input/output 93, and the input/output d? A size switch for detecting paper size and its respective inputs are connected to the port s4, and a copying condition setting switch and its respective inputs are connected to the input/output port 95. In addition,
Input/output port 96 is optional.

FIG. 11 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 a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 101, it starts counting, and when it counts out, the end pulse is assigned to the microcomputer 101. output to the included line. A reference clock pulse is input to the timer 02. Further, the microcomputer 10 receives position information from the position sensor f83, 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 sends the status signal of each pulse motor to the main processor group 71.
Used when outputting to.

FIG. 12 shows an example of the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71. Reference numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor.When a set value is set from the microcomputer 111, the count value is set based on the set value.
When the count is out, the end signal is output. This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line.

Further, an input/output port 114 is connected to the microcomputer 111, and a motor 36, 38139.58 is connected to the input/output port 114 via the pulse motor driver 80.
is connected.

Figure 13 shows the control circuit of the pulse motor.
04,114) is Nogurusu Mortado 7 Iha 1
22 (Fig. 9 o/# Luss motor driver 79.11
0) is connected, and this i! Luss motor driver 1
2211C pulse motor 123 (the pulse motor 31
~34,36゜s s, s 9 to phase a) O each t & 4
1A, A, B, 100 are connected.

Figure 14 shows the speed control method of the P4 pulse motor, (a) is the speed curve of the pulse motor, and (b) is the speed curve of the pulse motor.
The figure shows the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually become shorter, then become equal intervals, gradually become longer again, and then stop. That is, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, starting up, being used in the high-speed region, and then eventually falling down. Furthermore, 'l * t
2...Lx indicates the time of the phase switching interval.

Next, a function for specifying and erasing an erasing range of a document will be explained. 15 and 16, the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in a portion where the light of the lamp 4 is blocked.
30 is movably provided with a spot light source 131 as means for indicating the erasing range of the original. As shown in FIG. 16, this spot light source 131 includes a light emitting element 132 and a lens 133, such as a light emitting diode and a rung, which are provided opposite to the document table 2.
The light generated by the lens 2 is irradiated onto the document table 2 as a spot light having a diameter d through a lens 33. This slit light has such a brightness that it can pass through the document G set on the document table 2 and having a thickness of, for example, a postcard. Further, the spot light source 131 is a timing belt (toothed belt) 13 disposed along the guide shaft 130.
It is connected to 4. This timing belt 134 is connected to a pulley 136 provided on the rotating shaft of the starter motor 135.
A hook is passed between the driven pulley 137 and the driven pulley 137. Therefore, by rotating the nozzle motor 135, the spot light source 131 is moved to the first carriage 41! is moved in a direction perpendicular to the scanning direction. Further, the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side is provided with a position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131. For example, the spot light source 131 is moved. In this case, the spot light source 131 first comes into contact with the position sensor 138 to detect the initial position.

Next, a method for specifying the erasing range of the document using the spot light source 131 will be described with reference to FIGS. 17 to 19. The light source 131 is moved by operating the operation keys 301 to 30d described above. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spot light source 1 are driven.
31 is moved in the scanning direction (arrow y direction shown in FIG. 17). Further, when the operation key 301.degree. 30c is 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 30a to 30d while visually observing the spot light transmitted through the document G. For example, after moving the spotlight to 81 points on the document G shown in FIG. 18, the operator presses the position designation key 30e. push.

Then, the coordinate position specified by this S violet is stored in the main processor group 21 shown in FIG.

Similarly, when the position designation key 30 is pressed with the spotlight moved to point S on the document G, the positions of the 82 points are stored in the main processor group 71. The position of this light can be detected, for example, by counting the number of driving pulses of the pulse motor 33.135. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) with diagonal points of <St+s2 points as shown in FIG. 18(a) is designated as the erasure range. Also, the 18th
As shown in figure (b), specify points 83 and 84 of document G,
When the erasure range designation key sog is pressed, the area other than the square with 55 m 54 points as diagonal points is designated as the erasure range. When the 1 erasure range designation keys 30f and 30g are pressed in this way, the main processor group 71 performs calculations based on the positions of the two designated points, and the memory 140 stores a high level signal "1" in the erasure range. , a low level signal "0" is stored in the other parts. That is, this memory 1
40, for example, the capacitance in each column direction is X of the light source 131.
The movement distance in the direction divided by the position resolution in the X direction is approximately equal to
It is constituted by a RAM whose capacity in each row direction is approximately equal to the moving distance in the y direction of the spot light source 131 divided by the position resolution in the y direction. ), the high-level signal is sent to the address corresponding to the shaded area, as shown in Figure 19 (, ), and in the case of Figure 18 (b), as shown in Figure 19 (b). , low level signals are stored at other addresses.

Further, when the copy magnification is set using the zoom key 307 during magnification setting -306 on the operation panel 30, the set coordinate position is multiplied by the copy magnification, and the coordinate position is enlarged or reduced. Thereafter, based on this displaced coordinate position, a high level signal is stored in the erase range part and a low level signal is stored in the other part in the same manner as described above in the memory 140.

Note that when specifying the erasing range, the original G is set on the original table 2 with the copy side facing up, and when copying is to be performed, it is turned over along the double fixed scale. Therefore, the positions of the signals actually stored in the memory 140 are reversed in the column direction.

On the other hand, as shown in FIG. 20, an erasing array 150 as an erasing means is provided close to the photosensitive drum 1°, for example, between the charger 11 and the exposure section ph. As shown in FIGS. 21 and 22, this erasing play 150 includes a plurality of light-shielding cells 1 in a direction perpendicular to the rotational direction of the photosensitive drum 100.
51 are arranged, and inside each of these cells 151, as shown in FIGS. 23(a) and 23(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 15 facing the photoreceptor drum 1o to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 100. This erase array 1
The number of light emitting elements arranged in the memory 14 is, for example,
It matches the capacity in the 00 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 pits as the number of bits in the column direction of the memory 140, and a store register 16 in which the contents of this shift register 161 are held.
2. It is constituted by a switch circuit 164 consisting of a plurality of switch elements 163 that are controlled on and off by each output signal of the store register 162, and the movable contact pieces 163a of these switch elements 163 are grounded and fixed contacts.

163b is connected to each cathode of a light emitting element (light emitting diode) 152 constituting the erase play 150, respectively. The anode of each of these light emitting elements 152 is connected to the power supply Vcc via a current limiting resistor R, respectively.

After specifying the 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 411 and the photosensitive drum 10 are operated, and the memory 140 is read in the row direction. One column of data is sequentially read out (as shown in FIG. 19). This read data D 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 1θ reaches the erase play 150, the main processor group 71 outputs the silatch signal L.
TH is output, and in response to this signal, the shift register 16
The contents of is supplied to the store register 162. That is,
Since the erase array 150 is disposed between the charger 1 and the exposure section ph, the erase array 150 is
For example, the data for the column is the erase play 150 and the exposure part ph.
Assuming that the angle is 01 and the photosensitive drum 10 is rotating at an angular velocity ω, the output timing of the latch signal LTH is controlled so that it is supplied to the store register 162 before θ1/ω.

Each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. When the output signal of the store register 162 is at a 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 the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the main parts of this invention will be further explained. When specifying the erase range by operating the operation keys 30a to 30tl, the initial position of the spot light source 131 is approximately at the center of the copyable range, as shown in FIG. 8
#H, y, preferably in the #H position. However, in order to display the copyable range (x, y), the first carriage 411 supporting the spot light source 131 is positioned at the end of the copyable range (x, y), as shown in FIG. Therefore, the spot light source 131
is located outside the copyable range (x, y). Therefore, when any of the operation keys 30h to 30d is operated, the copyable node yB (x *
The spot light source 131 is arranged to move approximately to the center of y).

That is, when any of the operation keys 30a to 30rl is operated, the main processor group 71 first drives the pulse motor 43.135, and the spot light source 131 is driven.
is moved to approximately the center of the copyable range (x, y). Thereafter, the erase range is designated by the operation described above.

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.

In addition, when specifying the erasing range, the spot light source 131 moves to the approximate center of the copyable range (x, y) in the first operation, and the erasing range specification starts from this position. It can be done quickly.

Furthermore, since the first carriage 411 is provided with the spot light source 131, space can be used effectively and it is possible to suppress the increase in size of the apparatus.

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

For example, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section ph shown in FIG. 20, but also between the exposure section ph and the developing device 12 as shown in FIG. It is also possible to configure the electrostatic latent image to be erased according to a designation.

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

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

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can specify and erase any part of a document image and can quickly specify the erasing range.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the image forming apparatus according to the present invention, FIG. 1 is a plan view showing a copyable range, and FIG. 2 is a plan view showing the operation. , 3rd
4 shows the configuration of the image forming apparatus, FIG. 3 is an overview perspective view, FIG. 4 is a side sectional view, FIG. 5 is a plan view showing the configuration of the operation panel, and FIG. 6 7 is a perspective view schematically showing the drive mechanism of the optical system, FIG. 8 is a perspective view schematically showing the drive mechanism of the pointer, and FIG. 9 is a perspective view schematically showing the drive mechanism of the optical system. A configuration diagram showing the 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, FIG. 12 is a configuration diagram of the second sub-processor group, and FIG. 13 is a configuration diagram of the main processor group. FIG. 14 is a diagram for explaining the speed control method of the pulse motor, FIG. 15 is a perspective view of the main parts showing the spot light source, and FIG. 16 is the main part showing the spot light source. 17 to 19 are plan views shown to explain the operation of specifying the erasing range of an original using a spot light source, and FIG. 20 is a side sectional view of the main part showing the arrangement of the erasing array. Figure, 2nd
1 and 22 respectively show the relationship between the erasing array and the photosensitive drum, 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 is a front view showing only the main parts. 24 shows the configuration of the erasing array; FIG. 24(a) is a side sectional view, FIG. , FIG. 25 is a side sectional view of the main part showing another example of the arrangement of the erase play. 1...Main body, 2...Original table, P...Paper, 10.
...Photosensitive drum, 30h to 30d...Operation key, 3
0m...Position specification key, 30f, 30g...Erase range specification key, 33...Scanning motor, 411...
First carriage, 71... Main processor group, 13
1... Spot light source, 132... Light emitting element, 135
... / Nrus motor, 150 ... Erase array, 15
2... Light emitting element, 160... Array drive unit, 14o
...Memory, Ph...Exposure section. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Prisoner No. 6V! J Prisoner 12 Figure 15 Figure 16 d Figure 17 30a-0e-3od' Figure 18 (a) Figure 18 Figure 19 (a) (b) Figure 20 Figure 25 Figure 21 Figure 22 (a) (b)

Claims (1)

[Claims] (1) A document placed on a document table is optically scanned, a reflected light image from the document is focused on a charged image carrier to form a charge pattern, and this charge pattern is developed. In an image forming apparatus that forms an image by transferring and fixing it to a material to be transferred, an indicating means provided in the scanning means and irradiating a spot light to indicate a predetermined range of a document when specifying a range;
an erasing means for erasing charges in a portion corresponding to the designated range during image formation; an operating means for operating the indicating means; and when the operating means is operated, a spotlight is emitted prior to the range specification. An image forming apparatus comprising: a control means for controlling the movement of the instruction means so that the instruction means is positioned approximately at the center of an image forming possible range.