JPH02275476A - Copying machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus having an automatic density adjustment function.

[Conventional technology]

Conventionally, the density of a copied image has been adjusted manually by an operator, who looks at the original, predicts the copied image, and enters whether to make it darker or lighter using a key, or by a copying machine that uses the density information on the original surface. There is an automatic density adjustment method that reads the information and determines the optimum exposure light amount or optimum development bias based on the reading. Since automatic density adjustment does not rely on the operator's hesitation, it is convenient because it eliminates the need to repeatedly change the density and make copies until a good copy is obtained.

[Problem to be solved by the invention]

In the above conventional technology, if the reference area for the original density during automatic density adjustment is always a fixed area, all the information in the original image is determined by the information in that area, so it is not possible to make a copy with the desired density. The problem is that it cannot be obtained. For example, there may be a case where the reference area is solid black and the rest is a normal text document, or the reference area is a normal text document and the rest has a dirty background. In particular, the above problem often occurs when the original is a document that has been copied many times.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying apparatus that can obtain an image with an appropriate original density even if the original density differs partially.

[Means to solve the problem]

The above objects include an original density reading means for reading the density of any part of the original surface, an area input means for specifying an arbitrary area of the original, an automatic density adjustment means for setting an appropriate copy density according to the original density, and an automatic density adjustment means for setting an appropriate copy density according to the original density. When the density adjustment mode is selected, a control means is provided for controlling the area input by the area input means to be used as density setting data for the copy image, or for reading the density at an arbitrary location on the surface of the document. An original density reading means, an area input means for specifying an arbitrary area of the original, a setting means for setting an outside erase mode for erasing images outside the specified area, and an automatic setting means for setting an appropriate copy density depending on the original density. A density adjustment means, and a control means for controlling so that when an automatic density adjustment mode is selected and outside erasure is specified, only the area inputted by the area inputting means is used as density setting data of the copied image. This is achieved by structuring.

[Effect]

When the automatic density adjustment mode by the automatic density adjustment means is selected, the image density setting data of an arbitrary area specified by the area input means can be detected by the document density reading means, and based on this image density setting data. A copying operation is performed.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of a copying apparatus according to the present invention, in which symbol 2 represents a fourth mirror and 2 represents a lens.

Dust-proof glass to prevent toner stains on mirrors, etc., 3 is an ADF (automatic document feeder), 4 is a contact glass, 5 is an eraser (erase lamp), 6 is a charger, and 7 is a selenium photoconductor. 8 is a drum thermistor for detecting the surface temperature of the photosensitive drum 7; 9 is a static elimination lamp; 10 is a lens; 11 is a quenching charger (charger after cleaning);
is a cleaning unit, 13 is a bias roller, 14
15 is a first scanning mirror which forms a first carriage integrally with the lighting unit 14 etc. 16 is a second mirror 17 is a third mirror 1
8 is a fixing unit that fixes the toner image transferred to the transfer paper;
19 is a reversing unit that controls the discharge direction and discharge surface of the transfer paper after fixing in the fixing unit 18; 20 is a sorter that sorts the transfer paper after it has been discharged; 21 is a separating claw; 22 is a conveyor belt;
23, 24, 25, and 26 are trays for stocking and supplying transfer paper, 23 is a double-sided paper feed tray, and 24 is a first
2 is a feeding tray, 25 is a second feeding tray, 26 is a third paper feeding tray, 27 is a paper feeding roller unit, 28 is a vertical stile transport section, 2
Reference numeral 9 denotes a horizontal paper conveyance unit, 30 a paper dust removal roller for removing paper dust from transfer paper, 31 a separation charger, 32 a transfer charger, 33 a registration roller, and 34 a roller for removing old developer when replacing the developer. A developer collection container 36 is a PTC (
37 is a developing unit; 38 is a drum heater for increasing the temperature of the photosensitive drum 7;
9 is a toner cartridge for replenishing consumed toner;
40 is a drum shaft that rotatably supports the photosensitive drum 7;
4I is an FCC (pre-cleaning charger).

In the figure, a photosensitive drum 7 is rotatably supported by a drum shaft 40 and rotated counterclockwise in response to a copy command or the like. Simultaneously with the rotation of the photoreceptor drum 7, to prevent the toner adhering to the photoreceptor drum 7 and uneven potential from reaching the charger 6 and the developing unit 37.
Static elimination lamp 9゜PTC36, separation charger 31. Transfer charger 32. Eraser 5. Cleaning unit 1
2° bias roller 13. The FCC 41, quench blow charger 11, etc. are driven. cleaning unit 1
2, and after passing through the static elimination lamp 9, the photoreceptor drum 7
The surface potential of is zero.

The photosensitive drum 7 is driven by a main motor (not shown). At this time, the leading edge of the image is set to be at a position beyond the position where the image passes through the cleaning unit 12 according to a control section, which will be described later.

When the photosensitive drum 7 has rotated to the fixed position, the ADF 3
The original placed on the contact glass 4 by
Scanning mirror 15. Scanning is performed by a first carriage integrated with the illumination unit 14 and the like. The reflected light image is captured by the first scanning mirror 15. Second mirror 16. Third mirror 17. Lens 10. An image is formed on the photosensitive drum 7 via the fourth mirror 1 and the dustproof glass 2.

After the photosensitive drum 7 is charged by the charger 6, an eraser, that is, an erase lamp 5, illuminates unnecessary areas to create an image frame suitable for the transfer paper or the projected image. A latent image is formed on the drum 7. At this time, the photosensitive drum 7 and the first carriage 15 are driven at the same speed in order to obtain a same-sized image.

The latent image on the photosensitive drum 7 is visualized as a toner image by the developing unit 37. In this case, the developing unit 37
A dark or light image can be obtained by applying a potential to.

Also, the double-sided paper feed tray 23. 1st feeding tray 24° 2nd feeding tray 25. Alternatively, the transfer paper stocked in the third paper tray 26 is detected by the paper feed roller unit 27 (
(not shown) is operated.

Next, at the paper feeding timing, the paper feeding roller unit 27 is operated again, and the transfer paper is transferred to the vertical paper transport section 28 or the horizontal paper transport section 2.
9 to the registration rollers 33 which have been stopped in advance, and the registration rollers 33 are driven at the timing when the leading edge of the toner image on the photosensitive drum 7 and the leading edge of the transfer paper match.

The toner image on the photosensitive drum 7 is transferred to a transfer paper by a transfer charger 32. At this time, the surface of the photoreceptor drum 7 is very smooth, and therefore the adhesion between the photoreceptor drum 7 and the transfer paper is large, so the separation charger 3
1, the potential of the transfer paper is lowered to reduce the adhesion between the photosensitive drum 7 and the transfer paper. Next, separation claw 2
1, the transfer paper is separated from the photoreceptor drum 7, and
The transfer paper separated in this way is sent to the fixing section 18 by the conveyor belt 22. Heat and pressure are applied to the toner of the transfer paper sent to the fixing section 18, whereby the toner image on the transfer paper is fixed to the transfer paper, and then,
The transfer paper is discharged to the sorter 20 via the reversing section 19.

When performing double-sided copying or the like, the paper is discharged to the double-sided paper feed tray 23.

Since a small amount of toner image remains on the surface of the photoreceptor drum 7 after transfer, the FCC 41 is activated and the surface is cleaned with the cleaning brush and cleaning blade in the cleaning unit 12, and the next quenching charger 1 is cleaned.
1 and a static elimination lamp 9 to keep the surface potential constant.

These control timings are obtained mainly from pulses generated in synchronization with the rotation of the photoreceptor drum 7 or reference pulses for driving the photoreceptor drum 7.

FIG. 2 is an enlarged configuration diagram showing the optical system, in which 7 is a photosensitive drum, 50 is a document, 5 is a document scale, 52 is a contact glass, 53 is a light amount sensor which is a document density reading means, 54 is an exposure lamp such as a halogen lamp, 5
5 is a lens, 56 is a dustproof glass, 57 is a first mirror, 5
8 is the second mirror 59 is the third mirror 60 is the fourth mirror
61 is a fifth mirror, 62 is a sixth mirror, and 63 is an optical path of an exposure lamp.

In the same figure, light 63 emitted from the exposure lamp 54 hits the original 50 on the contact glass 52, and the first mirror 57 → second mirror 58 → third mirror 59 → lens 5
5 → fourth mirror 60 → fifth mirror 61 → sixth mirror 62
→It reaches the photosensitive drum 7 through the dustproof glass 56. The exposure lamp 54 and the first mirror 57 move in the scanning direction (arrow A direction) at a speed corresponding to the copying magnification. FIG. 2 shows a state in which each part is in its home position. 2nd mirror 5
8 and the third mirror 59 are connected to the exposure lamp 54 and the first mirror 5
It moves in the scanning direction A at a speed of 1/2 of 7. Overall position control is performed by signals from an encoder synchronized with the rotation of a scanner drive motor (not shown). As the photoreceptor drum 7 rotates, each part moves as described above, thereby forming an electrostatic latent image on the photoreceptor drum 7. On the other hand, the light amount sensor 53 reads the reflected light of the light 63 emitted from the exposure lamp 54 onto the original 50 through an optical fiber (not shown) with a photosensor section, and converts it into a voltage value. The light amount sensor 53 is located on the same unit as the exposure lamp 54 and the first mirror 57, and is movable in the sub-scanning direction.

FIG. 3 is a block diagram of the control system, in which 70 is a CPU (central processing unit) which is a control means, 71 is a memory,
72 is various loads of the copying machine, 73 is an editor to be described later, 7
Reference numeral 4 represents an operation panel of the operation section, and 75 represents a scanner comprising the above-mentioned optical system.

In the figure, the CPU 70 includes an editor 73, an operation panel 74, and an editor 73. Input from light sensor 53 etc. and memory 7
By exchanging signals with the editor 73.1, a drive output signal is output to the load 72 of the copying machine, and the editor 73. Operation panel 7
Display signals etc. are output to 4.

FIG. 4 is a perspective view of the editor 73, which is an embodiment of the area input means, in which 80 is a stylus pen, 81 is a document holder, 82 is a document reference position mark, 83 is a mode selection area, and 84 is an editor board. be.

In the figure, there is an X inside the editor board 84.

There is a resistor (not shown) in the Y direction, and the stylus pen 80
When one point on the coordinate board is pressed, the voltage of the resistor is detected,
The detection signal is sent to the cp() 70 as a coordinate position.

FIG. 5 is an explanatory diagram for explaining area setting on the editor board, in which 50 is a document, 84 is an editor board, 82 is a document reference position mark, 85 is a coordinate reference position,
S is a designated area.

In the same figure, the original 50 is set with the original 50 side facing up, aligned with the original reference position mark 82 of the editor board 84, and the points P+ (X+, Y+) and pg(Xz, Y2
) with the stylus pen 80 to set the area S. The document reference position mark 8 is attached to the contact glass 52 in FIG.
The original 50 is placed upside down so that the second side is on the original scale 51 side. This editor 73 is for a center-based copying machine.

FIG. 6 is a plan view of the operation unit, where 90 is a print start key, 91 is an enter key, and 92 is a numeric keypad 93
94 is a display section; 94 is an area designation key 95 is an automatic density adjustment key included in the automatic density adjustment means; 96 is a key for setting a low density; 97 is a key for setting a high density; 98 is a density setting display section.

In the figure, the area specification by the editor 73 described above is as follows:
This is performed after the area designation key 94 is turned on and the designation mode is entered. Other keys 90,91゜92.95.96.9
The key functions of 7 and the operation of the displays 93, 98 are known.

Next, the operation of this embodiment will be explained. FIG. 7 is a flowchart showing the operation of this embodiment, and FIGS. 8 and 9 are its subroutines. First, the case where the automatic density adjustment (ADS) mode is selected (step 7-1) is the mode that will be explained from now on.

If the area designation mode is selected in step 7-2, the area is input (step 7-3).

Area input is performed by specifying two arbitrary points within the input area with the stylus pen 80 as shown in FIG.

Now, moving to the subroutine of FIG. 8, if points P and P2 are input (step 8-1.2), the shaded area in FIG. 5 is treated as the area S. The position of the light amount sensor 53 in the sub-scanning direction is moved to the center of the designated area (step 8-3.4).

Returning to FIG. 7, when the print start key 90 is pressed after completing the area input (step 7-4), the optical system enters pre-scan (step 7-5), moves to the subroutine of FIG. will start scanning in step 9.
-1) Turn on the exposure lamp 54 (step 9-2). The density of the original image is read when the scanner returns (step 9-3.9-4). The scanner position changes from Y2 (step 9-5) to Yl (step 9
-8), the original image density vDE is read (step 9-6). The read data VDE is peak held (step 9-7). Specific examples thereof are shown in FIGS. 1O to 12.

Figure 10 is an explanatory diagram showing the relationship between ADS input voltage (Vo) and time, and Figure 11 is a diagram showing the relationship between ADS input voltage (Vo) and time.
An explanatory diagram showing the relationship between the input voltage (VD) and FIG. 12 is an explanatory diagram showing the relationship between the lamp voltage correction value and the ADS input voltage (VOE).

In FIG. 10, vD! The peak value of is the value based on the scene that is reflected the most (the background part of the original), and this value is used to correct the development bias and exposure light amount (
Step 7-6). Generally, as the amount of exposure light increases or as the developing bias increases, the copied image becomes thinner. Conversely, if the amount of exposure light or the developing bias decreases, the copied image will become darker. Therefore, the development bias and exposure light amount are corrected as shown in FIGS. 11 and 12 so that the background portion appears white.

When the above correction force is applied to multiple copies, the process moves to copying operation (step ?-7) and is repeated until the copying is completed (step 7-8).
).

On the other hand, if it is not the area specification mode in step (7-2), turn on the print start key 90 (step 7
-9), the position of the light amount sensor 53 in the sub-scanning direction is set to a fixed position (for example, the center), and the document density is vl and E are read (step 7-11), the developing bias is corrected based on the value of VD[ (step 7-12), and the copying operation is continued. In this case, scanning has already started, so
Correction based on the detected data VDEO value is only for the developing bias. This method is advantageous in speeding up copying since pre-scanning is not required.

The determination of whether or not to specify an area (step 7-2) is made by, for example,
A region designation mode key 94 is provided on the operation panel 74,
If there is a selection based on this, or if there is any input to the editor 73, the area specification mode is automatically set, and the editor 73
If the print start key 90 is pressed without any input, the mode may be set to a fixed area.

In the explanation of the above operation example, the editor 7 is used as the area input means.
3 has been described as an example, but other operations can also be performed using the numeric keypad 92 of the operation panel 74. In this case, the distances of the four boundaries of the specified area from the reference point are X+, Xz, Yl
, Yz using the numeric keypad.

As described above, according to this embodiment, when copying a document 50 with a locally soiled background in the automatic density adjustment mode, the copied image is optimized based on the image information within the specified area S. Therefore, it is possible to make the image of the designated area S distinctly clearer without having to repeat copying many times until the optimum copy image is obtained by manual density adjustment.

In addition, if it is possible to select and use the automatic density adjustment mode between a fixed area mode that is fixed in advance as the original density reference area and a mode that specifies an area as described above, the entire image of the original 50 can be used. Those that are uniform in area are in fixed area mode and require fewer operations to set copy conditions.
Further, when the copying time is short and the image density of the original 50 is uneven, it is possible to use the copying method selectively, such as giving priority to producing an appropriate copy image.

Furthermore, by using an editor as the area input means 73, input can be easily performed.

Further, if the numeric keypad 92 is used as the area input means 73, there is no need to add a new editor, and the functions and effects of this embodiment can be achieved at low cost.

In addition, when using the automatic density adjustment mode to determine the copy image based on the density of a specified area of the document, if there is an input error in the specified area, the operator can be alerted to the input error, and the input error can be corrected. Since the operator is prevented from entering the copying operation, it is also possible to prevent the operator from continuing the copying operation without knowing about the input error, thereby preventing copies that do not have the desired density from being made.

The second embodiment will be described below based on FIGS. 13 to 20.

FIG. 13 is a plan view of the optical system, where 54 is an illumination lamp such as a halogen lamp, 100 is a first scanner (carriage), 0 is a detection sensor (ADS sensor) for reading the original density, and 102 is a first scanner (carriage). Document length detection sensor (A
103 is an original width detection sensor (AP
SW sensor), SC is scan direction, A3 to A5, 84
~B6 indicates the size of the document 50.

In the same figure, an ADS sensor 101, an APSL sensor 1
02, the APSW sensor 103 reads the reflected light emitted from the exposure lamp 54 onto the original 50 through an optical fiber with a photosensor section (not shown), and converts it into a voltage value. Above three light amount sensors 20L 102.103
is located on the unit of the first scanner 100, and the ADS sensor 101 is movable in the sub-scanning direction.

FIG. 14 is a plan view of the operating section of the second embodiment, and shows the sixth embodiment.
It has almost the same configuration as the operation unit of the first embodiment shown in the figure, and the same members are given the same reference numerals and explanations will be omitted. The point is that an error display section 105 is provided.

15 to 19 are flowcharts for explaining the operation of the second embodiment, in which FIG. 15 is a subroutine that is called when the ADS mode is selected, and FIG. 16 is a subroutine that shows the operation of the embodiment. FIG. 15 shows the subroutine called. Figure 17 shows an interrupt routine that is entered at each timing of a signal from the encoder when the subroutine in Figure 16 is called, Figure 18 shows a subroutine for calculating document dimensions, and Figure 19 shows a subroutine for determining input area. It is a subroutine.

In FIG. 15, when in the area specification mode (step 15-1), input the fil area (step 15-1).
2). Area input is performed by specifying two arbitrary points within the entry area with the stylus pen 80, as in the first embodiment. When points P1 and P2 are input in FIG. 8, the shaded area (FIG. 5) is treated as area S. The position of the ADS sensor 101 in the sub-scanning direction is moved to the center of the designated area (step 8-3.4 in FIG. 8). After the area input is completed, returning to FIG. 15, when the print start key 90 is pressed (step 15-3), the optical system enters a pre-scan (step 15-4).

The document size is detected during pre-scanning, and the document density is detected during return. When the document length counter is cleared (step 16-1) and the exposure lamp 54 is turned on (step 16-2) to increase the light amount,
The scanner 100 starts moving in the scanning direction S (step 16-3). When the scanner 100 reaches the return point (position of maximum scan length), the scanner 100
After returning to the home (step 16-6), the scanner 100 is stopped (step 16-7) and the lamp 54 is turned off (step 16-8).

During this time, the interrupt process shown in FIG. 17 is performed every time there is a signal from the encoder. During scanner forwarding (step 17-1), APS processing is performed (step 1
7-2). For document width detection, the scanner 100 position is the 13th
Special treatment is received when Pw in the figure is reached (step 17-3), AP
Read the output of the SW sensor 103 (step 17-4
), if the read data is data with a document, set the width data to 1, otherwise set it to O (Step 1
7-5). Document length detection starts at the same time as the scanner starts. The output of the APSL sensor 102 is read (step 17-6), and if the read data indicates that a document exists (step 17-7), the length counter is incremented (step 17-8). The length counter is cleared before starting the prescan (step 16-
1). Since the length counter is incremented at intervals of interrupt signals from the encoder synchronized with the scanner drive motor, the length of the document can be determined from this counter. When the APSL sensor 102 no longer detects the document (step 17-9), the document dimensions described later are calculated (step 17-10>), and it is determined whether the area input in FIG. 8 is valid (step 17-9). 17-11),
APS processing ends (step 17-12).

When the length counter is O upon scanner return (step 17-13), that is, when the document cannot be detected, an APS error occurs (step 17-14). This AP
When an S error occurs or when an area specification error occurs in the input area determination (step 17-11) (step 17-15), the document density is not detected.

The density of the original image is read when the scanner returns. Reading the original image density VDE (step 17)
-17) is performed when the scanner position is between Y2 and Yl (step 17-16).

Loaded data vD! is held at its peak (steps 17-18).

If there is an area specification error (step 15-5) or an APS error (step 15-6), a warning (“Paper size direction confirmation 104” or “area specification error 105”) is displayed on the operation panel 74.Step 15-7 ), clear the input area specification data (step 15-8) L,
Return to step 15-1.

On the other hand, if it is not the area specification mode in step 15-1, turn on the print start key 90 (step 15-1).
-12), set the position of the ADS sensor 101 in the width scanning direction to a fixed position (for example, the center), and start the scanner (
From step 15-13) until before the leading edge of the image on the photosensitive drum 7 is developed, the document density V is read (steps 15-14), and the developing bias is corrected based on the value of VDE (step 15). -15), continue the copying operation. In this case, since scanning has already started, only the development bias is corrected based on the detected data VDEO value. This method does not require pre-scanning, so it is advantageous in speeding up copying.

FIG. 18 is a flowchart for calculating document dimensions,
Convert the length counter L to length data in mm (step 18-1), and add the width data W to A3 to B6.
The size of the original is determined (step 1B-2).

FIG. 19 is a flowchart of input area determination, in which the document size is loaded (step 19-1), and the coordinate data indicating the range of the determined document size is displayed in the range (XO, , XO, .

YOI, YOz) (step 19-2) and the specified range (X+, Xz) by the editor 73 in FIG.

Y, ,Y,) in step 19-3), and if the specified area is outside the range of the document 50, it is determined as an area specification error (
Step 19-4).

In FIG. 20 mentioned above, 50 is a document, 51 is a document scale, S is a specified area, and K is a coordinate reference.

Further, when performing an outside erasing operation to obtain a copy in which areas outside the specified area of the document are erased, it is preferable to determine the image density based on the image density of the portion that is not erased.

A third embodiment will be described based on FIGS. 21 to 23, in which image density determination corresponding to the above-mentioned outer erasing operation is performed.

FIG. 21 is a plan view of the operating section of the third embodiment, and shows the first
It has almost the same configuration as the operation unit of the second embodiment shown in FIG.
The point is that

In the same figure, a setting means for setting a mode in which a specified area within a document is erased and copied is an inside erase key 106, and a setting means for setting a mode in which an area outside a specified area is erased and copied is outside. This is the erase key 107.

FIG. 22 is an explanatory diagram for explaining the designated area,
50 is the original, 52 is the contact glass, K is the coordinate reference,
XFLIL indicates full range in the X direction.

In the figure, an area S (coordinates x1Xz,
Y+, Yz) is specified.

In the third embodiment, the image density is read in the area S.
In specifying the ADS mode, the timing of reading the density, etc. is determined based on the image density of the portion that will not be copied and erased. This is the same as the second embodiment.

However, during the copying operation, as shown in FIG. 23, the photosensitive drum 7 that is uniformly charged by the charger 6 is
The scanner position is up to Y and after Y2 (step 23-1)
) to fully light up the eraser 5 (Step 232), from Y+ to Yt, eraser Xo ~ X+, Xz
~ Light up the part corresponding to XFLIL (step 23
-3) Remove charges outside the specified area so that an image is formed only within the specified area. When changing magnification, X, , Xt, Y
,,yz is converted to a value corresponding to the magnification ratio and the same thing is done.

〔Effect of the invention〕

As explained above, according to the invention recited in claim 1.2.3, even if the original density differs partially, copying can be performed with the image density of the designated area within the original, and the original density can be adjusted to the appropriate original density. A copying device that can obtain images can be provided.

[Brief explanation of drawings]

1 to 12 are drawings relating to a first embodiment of a copying apparatus according to the present invention, and FIG. 1 is a block diagram of the entire copying apparatus;
Fig. 2 is a block diagram of the optical system, Fig. 3 is a block diagram of the control system, Fig. 4 is a perspective view of the editor, Fig. 5 is an explanatory diagram of area specification, Fig. 6 is a plan view of the operation section, 7, 8, and 9 are flowcharts related to the operation of the first embodiment, FIG. 10 is an explanatory diagram showing the ADS input voltage waveform, and FIG. 11 is an explanatory diagram showing the relationship between the bias voltage and the ADS input voltage. 12 is an explanatory diagram showing the relationship between the lamp voltage correction value and the ADS input input voltage, and FIGS. 13 to 20 are drawings related to the second embodiment of the present invention, and FIG. 13 is a plan view of the optical system. Figures 14 and 14 are plan views of the operating section, Figures 15, 16, 17, and 1.
8 and 19 are flowcharts related to the operation of the second embodiment, FIG. 20 is an explanatory diagram explaining the range of document sizes, and FIGS. 21 to 23 are drawings related to the third embodiment of the present invention. , FIG. 21 is a plan view of the operating section, FIG. 22 is an explanatory diagram illustrating the designated area, and FIG. 23 is a flowchart relating to the operation of the third embodiment. 53.101... Original density reading means, 70...
Control means, 73... Area input means, 95... Automatic density adjustment means, 107... Setting means. Figure 2 Cause 3 Figure 4 Figure 5 District 7 Figure 10 Figure 11 Figure 405X ICE (VoE) → Figure 9 Figure 12 Figure 13 W Figure 16E District 19

Claims (3)

[Claims] (1) a document density reading means for reading the density at an arbitrary location on the document surface; an area input means for specifying an arbitrary region on the document; and an automatic density adjustment means for setting an appropriate copy density according to the document density; and control means for controlling the area input by the area input means to be used as density setting data for the copied image when the automatic density adjustment mode is selected by the automatic density adjustment means. Copying equipment. (2) Document density reading means for reading the density at any location on the document surface, area input means for specifying any area on the document, and setting means for setting the outside erase mode for erasing images outside the specified area. and an automatic density adjustment means for setting an appropriate copy density according to the density of the original; and when the automatic density adjustment mode is selected in the automatic density adjustment means and outside erasure is specified, A copying apparatus comprising a control means for controlling only the area within the area to be used as density setting data for a copied image. (3) an area specification mode in which the area input by the area input means is controlled to be used as density setting data for a copy image in the automatic density adjustment mode, and a predetermined area is used as the document density reference area; 3. The copying apparatus according to claim 1, wherein the area fixing mode is set to be selectable.