JPS6235376A - Copying device - Google Patents

Abstract

PURPOSE:To simplify a constitution by constituting an erasing means with plural light emitting parts and forming a desired pattern on a recording medium through the use of said light emitting parts. CONSTITUTION:The surface of an original placing glass 251 is provided with a touch panel using a transparent electrode. A pressure pen 252 is pressed to detect coordinates at a designated position. Only when a switch 253 installed on the pen is pressed, coordinates can be inputted. A LED array 254 installed on the edge of the original placing glass 251 along directions X and Y can light up and go out arbitrarily according to the command of a main body CPU. A command part 320 is installed before a digital 304 formed with a transparent electrode, and by pressing a screen through the pen in the same manner as the coordinate input in the designated area, a command is selected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a copying apparatus capable of forming a desired pattern on a recording medium.

[Prior art]

Conventionally, in this type of apparatus, an apparatus has been proposed in which, for example, a semiconductor laser, a scanner, and its driving circuit are provided separately from a document copying mechanism, and a desired pattern is formed on a recording medium such as a photoreceptor.

However, the above-mentioned apparatus has the disadvantage that the structure is very complicated and the entire apparatus is expensive.

〔the purpose〕

The present invention has been made in view of the above points, and an object of the present invention is to provide a copying apparatus capable of forming a desired pattern on a recording medium with a simple configuration.

〔Example〕

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

Description of Main Body FIG. 1 is a sectional view showing an embodiment of a double-sided copying machine to which the present invention is applied, in which an RDF 9 (automatic document feeder) and a sorter 39 are attached. Also, instead of RDF9, pressure plate 9
In some configuration diagrams, the surface of the drum 1 is made of a seamless photoreceptor made of ASI, and is rotatably supported. When the power is turned on by the power switch 2, the fixing device 3 is heated, and when it reaches a predetermined temperature, the main motor 4 drives the drum 1, the conveying section A,
B, C and the fixing roller 5 start rotating in the direction of the arrow.

When the temperature reaches a predetermined fixing temperature, the main motor 4 stops after performing potential control processing (pretreatment) and determining whether or not there is toner in the developing device 6.7, which will be described later. This is an expected state in which it enters a standby state and waits for a copy start signal.

First, the copying mode that can be performed by the copying machine of the present invention will be briefly explained, and then the copying process will be sequentially explained. Copying modes include one-sided copying mode, in which an image is formed on one side of the transfer paper and then ejected, two-sided copying mode, in which images are formed on both sides of the transfer paper and then ejected, and multiplex, in which multiple images are combined on one side of the transfer paper and then ejected. It can operate in copy mode, and in double-sided copy mode and single-sided copy mode, the intermediate tray 8 is used for copying.

Furthermore, by having a plurality of developing devices 6 and 7, copies can be made on transfer paper in a plurality of colors. Furthermore, by detecting the document size, it has AMS (automatic magnification change) and APS (automatic cassette selection) functions, and is equipped with a zoom function, etc.

(Double-sided copy mode) First, the process of obtaining a double-sided copy from a double-sided original will be explained. After setting the original 10 on the RDF 9, enter the key to make double-sided copies from the double-sided original on the operation unit 11 (described later), set the number of copies, specify the black developer 6 among the developers, and then press the copy start key. Enter. RDF
The original 10 set on the paper 9 is conveyed onto the original glass 12 . In addition, in the main body, the illumination lamp 14, which is integrated with the first scanning mirror 13, is set at the reference position 92, and performs potential control (described later) and input light of the COD for document detection (details will be described later). .

Next, the original 10 is illuminated by an illumination lamp 14 that is integrated with the first scanning mirror 13 , and the reflected light is scanned by the first scanning mirror 13 and the second scanning mirror 15 . The first scanning mirror 13 and the second scanning mirror 15 are 1:
By moving at a speed ratio of 1/2, the original is scanned while the optical path length in front of the projection lens 16 and the original detection lens 17 is always kept constant.

In this way, the above-mentioned reflected light image is formed on the detection element CCD 1 8 through the document detection lens 17, and also passes through the projection lens 16, the third mirror 19, and the fourth mirror 20.
imaged onto the drum.

On the other hand, after the drum 1 is neutralized by the pre-exposure lamp 21, it is corona-charged (for example, charged by ten) by the primary charger 22. Thereafter, the image illuminated by the illumination lamp 14 is exposed to slit light to form an electrostatic latent image. During the document size detection scan, the latent image is erased by the eraser lamp 23, and the AC portion of the developer bias is set to 0F.
It applies a bias to prevent toner from adhering to the original size detection element C by the FI and DC components.
The reflected light on the front original glass 91 is input to the 0D18 as original information, but the structure is such that the reflected light in the area where there is no original is extremely low, and the CCD
The processing will be described later.Next, after the CCD processing is completed, scanning is performed for copying, and after obtaining the electrostatic latent image as described above, it is visualized by a designated developer 6 or 7. , manual cassette 24. Upper cassette 25,
Paper feed rollers 50, 51, or 5 from the designated paper feed slot of the transfer paper in the lower cassette 26 or the deck 27.
2, the paper is fed and conveyed to the front of the registration rollers 28. After the member 29 attached to the illumination lamp 14 (hereinafter referred to as moving optical system) unit integrated with the first scanning mirror 13 is detected by the original light and edge position (image tip) detection sensor 30, it is fixed. time T,
Afterwards, the registration roller 28 is driven, and the transfer paper is sent toward the photosensitive drum 1 with accurate timing so that the leading edge of the latent image and the leading edge of the transfer paper coincide. Thereafter, the transfer paper passes between the transfer charger 31 and the drum 1, so that the toner image on the drum 1 is transferred to the transfer paper, and after the transfer is completed, it is separated from the drum 1 by the separation charger 32. .

Thereafter, the surface of the photoreceptor drum 1 is cleaned by a cleaning device 33.
It is cleaned by the pre-exposure lamp 21, and the potential unevenness is evened out by the pre-exposure lamp 21, so that it can be used repeatedly.

Further, the transfer paper separated from the photoreceptor drum l is led to the fixing device 3 by the transport unit (A), and after being fixed, the paper path path is switched and controlled so that it is transported to the duplex unit 35 by the flapper 34. , the transfer paper is transferred to the transport section (B
), (C), switch back, and are stored in the intermediate tray 8. When the exposure operation for the set number of sheets is completed, the original platen 1
RDF pass (D) for the original to' on 2.

The switchback is performed by steps (E) and (F), and the document 10' is again set on the document table 12 so that the back side thereof is copied. after completing the set.

The transfer paper fed by the paper feed roller 37 from the intermediate tray 8 is conveyed through the conveyance path (G) to the front of the registration roller 28, and the member 29 to which the moving optical system unit is attached is moved to the document leading edge position ( After a predetermined time Tl after detection by the image sensor 30, the registration roller 28 is driven to move the direction of the photosensitive drum l with accurate timing so that the leading edge of the latent image and the leading edge of the transfer paper coincide. sent to. Thereafter, the transfer paper passes between the transfer charger 31 and the drum 1, so that the toner image on the drum L is transferred, and after the transfer is completed, it is separated from the drum 1 by the separation charger 32. The surface of the photosensitive drum 1 is cleaned by the cleaning device 33, and unevenness in potential is evened out by the pre-exposure lamp 21, so that it can be used repeatedly.

Further, the transfer paper separated from the photosensitive drum 1 is guided to the fixing device 3 by the conveying unit (A) and fixed thereon, and then is discharged by the flapper 34 through the paper discharge roller 8 to the sorter 39. The copying operation is completed by performing this operation for the set number of copies. Further, the original 10' on the original table glass 12 is transferred to the original tray 4 via the paper bus path (D).
0.

It is also possible to make double-sided copies from single-sided originals. In this case, the original 10 set on the RDF9 has a paper path of ¥8 (
The transfer paper is set on the document glass 12 through the document H), the exposure operation for the set number of sheets is performed, and the transfer paper is stored in the intermediate tray 8 as described above. When the exposure operation for the set number of sheets is completed, the original 10' is discharged onto the original tray 40 via the paper path path (D). Further, in parallel with this original ejection operation, the next original is fed and set on the original glass 12.

Then, an exposure operation is performed on this document, and the intermediate tray 8
A copy is made on the other side of the transfer paper that has been copied on one side and is then discharged to the sorter 39. Further, when the exposure operation for the set number of sheets is completed, the originals are discharged onto the original tray 40 via the paper path path (D). This operation is repeated until the original has been circulated once.

(Multiple Copying Mode) Next, the basic process of multiple copying and the movement of the transfer material will be explained. After setting the original on the RDF 9, specify the multiple copy mode using the keys in the operation section 11, which will be described later. Next, set the number of copies, then select the developer to be used from among the multiple developers, and specify the developer. After doing so, enter the copy start key. As a result, the original 10 set on the RDF 9 is conveyed to the exposure position on the original glass 12. Then, a toner image is formed on the photosensitive drum 1 as in the double-sided copying mode, and this toner image is transferred onto the transfer paper. Then, the paper path path is switched and controlled so that the transfer paper separated from the photoreceptor drum l is led to the fixing device 3 by the transport unit (A) and fixed thereon, and then transported to the multiplexing (double-sided) unit by the flapper 34. Ru. As a result, the transfer paper passes through the conveyance section (B) to the switching device 4.
1 and stored in the intermediate tray 8. Repeat this operation for the set number of copies and complete the copying operation.
After ejecting the original 10' to the original tray through the RDF path (H), take out the next original from the RDF 9, and set the original on the original table 12 as described above.
In order to copy on the same side of the transfer paper, the transfer paper fed from the intermediate tray 8 by the paper feed roller 37 is transferred to the conveyance path (G
) is conveyed to the front of the registration roller 28 by the transfer unit A, where the copying operation is performed in the same manner as in the case of backside copying in the double-sided copying mode. After being fixed, the paper is discharged to a sorter by a flapper 34 through a paper discharge roller 38. This operation is repeated for a set number of copies to complete the copying operation.

Further, the original on the original glass 12 is discharged to the original tray 40 via the paper path path (H).

Next, the page continuous shooting mode will be explained.

After setting the original on the RDF 9, press the key manually to perform continuous copying using the operation section 11, which will be described later, and then set the number of copies.In this embodiment, there is a mode for specifying the developing device to be used among the developing devices. and a mode in which the color of one side of the snapshot and the color of the second side are automatically determined in advance. In the following explanation, the original size is A3 and the magnification is 1x and A.
The operation in a mode in which PS (automatic cassette selection) is selected and the - side and second developer are predetermined (black for the first side, red for the second side) will be described. - The original copy size is A4 size and 1/2 of the original A3) The original fed to the exposure position by the RDF9 as described above is
After scanning with the scanning mirror and the illumination lamp 14 to obtain an electrostatic latent image as described above, it is visualized by a predetermined black developing device, and the paper size sensor is attached to the upper and lower cassettes or decks. 42.43.44
Depending on the group, select the paper feed slot where A4 size transfer paper is set. For example, the upper cassette 25 is A3 size, the lower cassette 26 is A4 size, and the deck 27 is B4 size.
If different sizes of transfer paper are set,
The paper feed roller feeds the A4 size paper from the paper feed slot of the lower cassette 26, which is pushed into the lower cassette 26, and moves it to the registration roller 28.
After the image tip sensor 30 detects the member attached to the moving optical system unit, the registration roller 28 is driven after a predetermined time Tl, and the photosensitive drum l is moved with accurate timing. The leading edge of the latent image is aligned with the leading edge of the transfer paper. Thereafter, as described above, the paper goes through a transfer process, a fixing process via a conveyance system, is discharged, and copying is completed, and then the second copying begins. The moving optical system is controlled to automatically return to the optical system reference position 15 (home position) when the second exposure scan is completed, and the second copy start starts from the reference position 15. , after the member 29 attached to the moving optical system unit 45 is detected by the image tip detection sensor 30.

The eraser lamp is turned on for a predetermined time T2 (width of A4 size) to erase the latent image of the - side and the potential of unnecessary areas, and obtain a second latent image. is visualized by a predetermined red developing device (color developing device), and the paper is fed by a paper feed roller from the paper feed port of the lower cassette 26 into which the A4 size is pushed and is transported to the front of the registration roller 28. Then, after a predetermined time T3, the registration roller 28 is driven, and the latent image is sent in the direction of the photosensitive drum 1 with accurate timing, so that the leading edge of the latent image and the leading edge of the transfer paper are aligned. Thereafter, as described above, the image is discharged through a transfer process, a fixing process via a conveyance system, and copying is completed. In addition, as mentioned above, combinations of duplex copying and multiple developing units, duplex copying and continuous copying mode, multiple copying and multiple developing units, multiple copying and quick copying mode, etc. can be specified on the operation panel described later. It is configured. Another function is to vary the process speed (peripheral speed of the photosensitive drum 1) when the irradiation light to the photosensitive drum 1 is insufficient. When the function is selected, the process speed is automatically reduced.

In addition, as another function, in order to erase any part of the latent image on the photosensitive drum 1, after one image exposure and before development, an eraser lamp in which a large number of printing elements are finely divided is arranged, and printing is performed. It is configured so that any latent image can be erased by controlling the light emitting elements in the area.
It functions to combine the multiple copies described above and the colors of multiple developing units to synthesize images.

In addition, in order to make the process speed variable as described above, this embodiment uses the DC motor MI4 as the drive source, which will be explained using FIG. 2, and the speed is controlled by PLL control. is input to the PLL 81 as a reference, and the speed signal from the encoder 82 connected to the DC motor MI4 is fed back, and the output of the PLL 81 is amplified via the amplifier 83 so that the reference signal and the feedback signal are synchronized. The DC motor 4 is driven by a driver 84, and when changing the speed, it is controlled by input signals A and H to change the output frequency of the oscillator 80, and the signals A and B are not shown. It is connected to the speed command circuit. .

Operation timing Figure 3 shows the timing chart of the entire machine.
Figures to Figure 8 are forward rotation and potential control.

A timing chart of CCD dimming, CCD measurement, scanning, and post-rotation is shown. In FIG. 3, after the power is turned on, the fixing heater is turned on, the scanner is returned to the home position, and the lens performs initialization movement.
Pre-rotation potential control is performed after the fixing temperature reaches 185°C.

After the CCD dimming and post-rotation are performed and the fixing temperature reaches 195° C., the standby state is entered and copy key reception becomes possible. After the copy key is turned on, after controlling the pre-rotation potential, in preparation for the COD measurement scan, the lens moves to a position where the second mirror does not collide during full scan. The document size and document density are detected. Thereafter, the lens is moved according to the magnification or specified magnification by AMS calculation.

After scanning the set number of sheets and reversing the last one, it will start the post-rotation.

Figure 4 is a timing chart for pre-rotation, in which pre-exposure, blank exposure, and post-exposure are ONL in synchronization with the main motor, and from pre-exposure to sequentially turn on primary, post, and transfer 9-separation charging. The drum rotates to the forward rotation end.

During a copy operation, the specified developer is driven in synchronization with the main motor, and when it passes the potential sensor position from pre-exposure, the developing bias is set to the sensor output potential +2.
Enters 00v control. At this time, the other developing device is in a floating state.

FIG. 5 is a timing chart of potential control. At the start of potential control, the blank is turned off to form a dark potential on the drum. The drum potential is measured by a potential sensor, and the primary charging current is varied so as to approach the dark potential target potential of 450V. This is called Vn control, and the amount of light from the illumination lamp is controlled using the 0-order current obtained by VD, which is performed four times. Turn on the lamp to create a bright potential on the drum. The drum potential is measured by a potential sensor, and the bright potential approaches the target potential of 50V.
Controls the light intensity of the lighting lamp. This is called VL1 control, and is carried out three times.The bright potential is measured again using the amount of light obtained at Vtt, and this potential is called VL2, which is used to determine the developing bias DC.

After the VL2 measurement is completed, the potential control ends φ.

FIG. 6 is a timing chart for CCD dimming and CCD measurement. In COD dimming, the illumination lamp is controlled to have a light amount suitable for CCDIM setting. The scanner is located at the home position, exposes a standard white plate, measures the amount of reflected light using COD, controls the amount of light so that the maximum value on the - line is at a predetermined level, and after this control is completed, the optical The system performs a full scan to detect the size and density position of the document. At this time, when the document heat is detected, the threshold level and lamp light intensity are changed and scanning is performed again.

FIG. 7 is a timing chart of copy scanning. The optical system starts moving forward, and from the position where the image tip is detected, the developing bias DC becomes VL2+70V, and the developing bias AC is also turned on. Roughly speaking, desired blank lighting control is performed from the tip of the image at a predetermined timing.

FIG. 8 is a timing chart of post-rotation. After the final reversal of scanning, rotation begins, and sequentially from primary charging to developing device and developing bias DC.

Developing/<I7S AC is OFF, -t=7S+200V
, 0FFI, furthermore, post charging and transfer charging 9 separation charging are turned off. After one rotation of the drum from the primary charging OFF, the developing bias DC becomes 0■.

The main motor after the last paper has been ejected.

Blank exposure, post-exposure, and pre-exposure are turned off and the system enters standby mode.

Operation system FIG. 9-1 is a perspective view of a copying apparatus according to the present invention,
Reference numeral 251 is a document mounting glass, and a touch panel using transparent electrodes is provided on the glass surface.
By pressing the pressing pen on the document placement glass 251, the coordinates of the specified position can be detected.

Note that the principle of the touch panel will be omitted here. Of course, even when exposing a document to form an image, since a transparent electrode is used, it does not affect the latent image formed on the photoreceptor. 253 is a switch provided on the pen,
Coordinate input can only be performed when the switch is pressed. Reference numeral 254 denotes an LED array installed at the edge of the document placement glass 251 along the X and Y directions, and can be turned on and off as desired based on instructions from the CPU of the main body. Reference numeral 255 denotes an operation unit which controls control input/output commands to the copying apparatus.

FIG. 10 is a main perspective view of the operating unit, and the functions of each key will be explained in order.

100a-c are function keys, respectively;
It can be set arbitrarily using each key on the operation unit. This is a copy mode storage and recall key, and can store up to 5 types of modes. In other words, it is possible to memorize the mode that the user uses on a daily basis, the unique magnification used by each user, or the area specification area described later, and instantly by pressing one key. In a zero-copying device that allows you to set the desired copying mode,
Memory is always maintained by backup power.

Numeral keys 101 to 110 have a normal number-of-sheets setting function and, in combination with an asterisk key, a function of inputting various data in various asterisk modes.

Reference numeral 111 is a clear key for clearing the set number of sheets or data, and reference numeral 112 is a reset key for returning the set mode to a predetermined standard mode, returning to the normal copy mode.

113 is a preheating key, and 114 is an asterisk key for shifting to various asterisk modes. 115 is a copy stop key, 116 is a color key for selecting a plurality of developing devices built into the main unit, and when a color developing device is selected, a built-in LED 150 lights up, including as a warning. .

151 is a copy start key, and the LED is green when copying is possible (excluding copying), and red otherwise.
(151) is lit and displayed. 119 is the AE key,
An AE mode is selected in which a copy with an appropriate density can be obtained by detecting the original density and correcting the developing bias. Note that when the AE mode is selected, the display 152 lights up. Reference numerals 118 and 120 are manual density adjustment keys, and the density level can be increased or decreased using the keys 118 and 120 to obtain a desired density. If the key 118 is pressed, the density becomes high<(moat<>), and if the key 120 is pressed, the density becomes low (light), and the density level on the display 153 changes accordingly.152 and 153 meet the above density conditions. 154 is a 7-segment display that displays the number of copies.

Reference numeral 121 is a cassette selection key, which is used to manually select a cassette stage.
S) It has a function.

Reference numeral 155 is a display group indicating that the cassette is in the stage selected by the cassette selection key 121 or in the APS mode.

122 is a fixed enlargement magnification selection key, 123 is a fixed reduction magnification selection key, and 124 is an automatic magnification selection key (Auto
Magnifica-ti on Se l
ect: AMS) key, which has a function of automatically selecting an appropriate magnification based on the detected original size and the selected cassette size, provided that the AMS mode is selected.

Indicator 158 lights up. 125 is a zoom key,
It is possible to adjust the magnification in 1% increments using the 10 key and the - key. Reference numeral 126 is an equal magnification key, which sets the copy magnification to equal magnification (100%). Note that the display 157 lights up in the same-size mode. 156 is a dot matrix type fluorescent display tube, which normally has a set copying magnification of 9 and a selected cassette size.

It displays the copy mode, etc., and also functions as a message display for complex operation procedures, etc. when the device is abnormal or when the user is not operating the screen.

127 is a single-sided → double-sided J copy selection key that automatically copies two single-sided originals onto both sides of one sheet of paper using the intermediate tray in the main unit, and 128 is an automatic circulation document feeder (RDF). ) to copy a double-sided original onto one side of two sheets of paper [This is the duplex → single-sided 1 copy selection key, and 129 copies a double-sided original onto both sides of one sheet of paper using the intermediate tray and RDF. 130 is a multiple copy selection key for overlapping two or more images on one sheet of paper to perform multiple copying using an intermediate tray.

Note that when any one of $-127 to $-130 presses one key, one of the indicators 159 to 162 lights up correspondingly.

Reference numeral 131 is a page continuous copy selection key, which enables exposure scanning of the original on the document table into two parts (left and right) with a single operation to obtain two copies (referred to as A copy and B copy). Select the mode to use.

Reference numeral 132 denotes a page continuous copy, multiple copy, and selection key, which has a function of multiple copying A copy and B copy in the page continuous copy mode described above onto the same sheet.

Reference numeral 133 is a page continuous copy/double-sided copy selection key, which has the function of copying the above-mentioned A copy and B copy onto the front and back sides of the same sheet using the intermediate tray.

Reference numeral 134 denotes a frame erase key which has the function of erasing a tree edge or a shadow appearing in the center of a double-page spread in the page snapshot mode.

Reference numeral 135 is an image shift key, which allows the image to be shifted in either the left or right direction. Also, by pressing the numeric keypad while holding down this key, the shift amount can be adjusted. Further, this shift amount can also be stored in memory using function keys 100a-e.

Reference numeral 136 denotes an area designation key, which also serves as a release key for the area designation area. Two modes can be selected for area designation: original priority (the size of the designated area is variable depending on the magnification ratio) and cassette priority (the size of the designated area is constant regardless of the magnification ratio). Reference numeral 137 indicates an X/Y key, which is a data input key when inputting area designation using the numeric keys.

138 is a 1n10ut key, which is a selection key for selecting whether to develop the inside of the designated area or only the outside.

Reference numeral 139 is a modification key, which is a data recall key for calling and modifying a set area value.

140 is an inner or outer cut out of an area in multiple copies (
(inlout) and development color automatic switching key, and when this mode is selected in multiple copying, the color is automatically switched 1n10ut between A copy and B copy.

141 is a one-color automatic switching key for page snapshot;
As mentioned above, it has a function to automatically change the developing color for A copy and B copy, and when the key 141 is pressed, the display 170
lights up.

Each of the LEDs 157 to 171 is a selection mode display group indicating that each mode is selected.

Reference numerals 172 to 174 indicate the number of areas that have been set, and in this copying apparatus, areas up to 3 m can be set. Reference numerals 175 and 176 are display portions indicating inner/outer removal, which are lit in the mode set by the key 138.

The value of the set area for the 177 LED group is Xm1n.

This is an indicator that indicates which one is Xmax, Ymin, or Ymax.

142 is a CCD area designation key, and by pressing this switch, the optical system starts scanning and executes only the function of recognizing the area drawn on the document.

143 and 144 are a sort key and a collate key, respectively.

Reference numerals 178 and 179 are indicators for indicating sort and collate modes, respectively.

FIG. 11 is a basic block diagram showing the configuration of the display section.

The CPU 201 is a microcomputer that controls each display, and controls the display elements, and the display contents are based on display (communication) data from the main body CPU.

206 is a fluorescent display tube with 40 characters of 5×7 dots.

Data of 7 bits x 5 bytes is required to compose one character, and is sent from the character generator 203 at the instruction of the CPU 201 (7).

35-bit data is read out sequentially and transferred to the shift register latch driver 204.

Shift register latch e dry/<-204, 5
Bytes, ie, 35 bits of data are latched.

After that, shift register latch driver 20
5 drives a digit signal that determines the timing for displaying one character, and one character is displayed. In this way,
Dynamic lighting for one character at a time, and the duty ratio is l.
/40 (due to blanking time).

Further, 208 is another LED MATRIX of the display section, which is driven by dynamic lighting.

Figure 12 shows the input of the CPU 301 that controls the main body.
m', TI M Go 11ri # M 1
Sing * x Seven -I L II
The xx pts 302 is a group of switches provided for each input key, and dynamically switches the main unit C using well-known technology.
Processed by the PU 301, it is determined which key has been pressed.

A digitizer 304 is configured so that the control circuit 305 detects the x and y coordinates of the location pressed with the light pen.

3.08 is a coordinate manual trigger signal switch provided on the pen, and the main body CP is activated in synchronization with the trigger edge of this signal.
U301 reads the coordinates of the pressed part.

FIG. 13 is a driving block diagram of an LED array that displays a designated area provided on the document table glass frame.

LED arrays 309 and 310 are respectively installed in the x and y directions along the glass frame, and are controlled by the CPU 301 to dynamically light up.

Fig. 14 shows this situation. If you specify the outside of the shaded area in the figure, the LEDs indicating the X and Y coordinates corresponding to the area where the image will be formed will light up (in the figure). L.E.
D (shaded area).

Moreover, if the inside cutout is specified, only the LEDs in the shaded area are turned off, and the other LEDs are turned on.

In addition, conversely, the LED of the part of the specified area where the image is not formed
may be displayed.

FIG. 15 shows a color detection circuit of the developing device.

Projections 3 provided on each developer unit) 311, 312
11-1. Color detection switch 313, 3 by 312-1
Close 14. cpu301 is color detection switch 0N1
The color of the set developing device is determined based on the 0FF state.

In other words, each developer has its own switch pattern for each color, and as shown in the figure, if three switches are used for color detection, it is possible to distinguish between 23-1=7 different colors. .

Next, consider setting an area.

When the area specification key 136 shown in FIG.
The flashing indicates which one is currently selected, and you can also change the mode by pressing "l" or "2" on the numeric keypad. This series of displays and operations is 136
Executes only while the key is held down.

Here, a case will also be described in which the document-based area specification mode is selected. In this mode, if you specify an area on the X-axis (sub-scanning direction) and Y-axis (main-scanning direction) from the coordinate origin determined for the original, the specified area will also be automatically copied even if you make a variable size copy. The magnification is changed.

Xm1n coordinates, X using the numeric keypad and X/Y keys
Specify the points in the order of m a X coordinate, Ymin coordinate, and YmaX coordinate to complete the designation of l area. Specifically, “X/Y”, Xmin, “X/Y”, X
m a X + “X/Y”, Ym i n,
Input “X/Y” and YmaXs “X/Y” in this order. Note that each coordinate is set in mm units.

When the "X/Y" keys are input after setting the numerical values, the 177 LED groups light up in sequence, allowing the user to confirm that the coordinates of each point have been input. Also, when entering each coordinate, use the message display to enter the area l:Xm1n.
. . 000 m m ”, so even a user using the device for the first time can easily set the settings.

In this way, when you finish setting one area with 4 points, 17
LED 2 lights up to indicate that one area has been set. Further, the external extraction mode is automatically selected and the display 175 lights up. In/out here
' key 138 allows the mode to be changed to the inner cutting mode.

Further, the area designation can also be set using a touch panel using a group of transparent electrode switches on the document table 251.

In this case, the original is set face up on the original table, which is different from the standard when actually making copies (back left side). In this state, use the pressing pen 252 to specify an area (
press two points on the diagonal of the rectangle). At this time,
Press the input switch 253 while pressing it with the pressure pen. Coordinate input by the input switch 253 is an edge meeting trigger the moment you press or release it, and if it is held down, the coordinates will not be input even if you press it with the pressure pen. .

Here, when specifying coordinates with a pen, pressing l simultaneously specifies two coordinates, X and Y, so the 172 LED groups light up two points at the same time. In addition, the input coordinates are numerically displayed on the message e display section at the same time as they are input, so they can be visually confirmed. As described above, depending on the transparent digitizer input method, an area can be set by specifying only two points on a diagonal line.

Next, area specification using COD will be explained.

First, the original for which the area is to be designated is set on the original table, and the original is copied using a color other than the square color. On the copied paper, a desired area is marked with a dark frame using a marker pen or the like. Here, the reason for color development is that in order to create a difference in color density with this magic pen, it is preferable to develop the color so thinly that the desired area can be seen. Place the marked original (including transparent sheets, thin paper, etc.) on the original table again, and press the area detection key 142 to detect the optical system. starts scanning and recognizes the marked area on the document by the COD provided on the optical path. Here, it is assumed that only one location can be recognized in one scan for area detection. Additionally, the coordinates of the recognized area are displayed on the message display so that the area can be confirmed.

The area can be specified using the three input methods described above, numeric keypad, touch panel, and COD, and up to three areas can be specified by freely combining these methods.

It is also possible to store an area in a specified state using function keys 1OOa-e.

Further, the input area is provided along the X-axis and the Y-axis of the original platen glass 1, in addition to being visible on the message display. Visual confirmation can also be made using the LED array 4.

In this confirmation, the area is selected using the correction key 139, that is, pressing the correction key 139 once selects the first area, pressing it once again selects the second area, pressing it once again selects the third area, If you press it one more time, it will no longer specify the area. Pressing it again selects the first area again. Further X/
By using the Y key 137 to select each XY coordinate, the corresponding coordinates can be sequentially called up on the message display, and in this state, it is also possible to modify the set area using the numeric keypad. Of course, numerical values input and set using a transparent digitizer (touch panel), COD, etc. can also be corrected using the numeric keypad.

Furthermore, by selecting an area using the modify key and pressing the clear key 111, it is also possible to erase only a specific area.

Once the area is set and the inner and outer edges are set in this way, the erase means erases the inside or outside of the area during the copying process, thereby making it possible to obtain a desired copy.

Alternatively, it is also possible to specify the oNloFF of the LED array using the operation unit, and to specify the area by lighting the LEDs in a desired range.

When the CPU recognizes the coordinates of the area, it moves in the sub-scanning direction (X direction)
For, Xmin-Xma of the image formed on the drum
The blank exposure lamp (LED array) is turned on (inner extraction) or turned off (outer extraction) in the range corresponding to x, and in the main scanning direction (Y direction), Ymi of the image formed on the drum is
Digitize the LED array in the range corresponding to n~Ymax) t71 poison 9＾dr Footki) + Sudeshi L! Obtain a copy of the area with the inside or outside removed.

FIG. 9-2 is a diagram showing a document storage table.

A command section 320 is provided on the front side of the digitizer 304 formed of transparent electrodes, and a command is selected by pressing it with a pen in the same way as inputting coordinates when specifying an area. In this case, the coordinates pressed with the pen are read, and if the read coordinates are in the document i layer area, it is determined to be an area specification or magnification specification, and if the read coordinates are in the command area,
Select the command corresponding to that coordinate.

Here, 321 is a command to copy the inside of the specified area in black, 322 is a command to copy the inside of the specified area in color (for example, red), 323 is a command to copy the outside of the specified area in black, and 324 is a command to copy the inside of the specified area in black. A command 325 is a command to copy the outside in color, and a command 325 is a command to clear coordinates input with a pen. In this way, the area and color can be specified using the digitizer.

Of course, the digitizer may not be provided on the document storage glass, but may be provided on the front side of the document cover, or may be separated from the main unit.

Digitizers can be based on various principles such as resistance value detection, capacitance detection, position detection using strain wheel detection, and position detection using light.

This copying apparatus has a document size detection means using a CCD 18, a cassette size input means, and a zoom lens 16 for stepless magnification, thereby realizing AMS and APS.

When the copy key 117 is pressed, the optical system performs prescanning, inputs the original image at this time into the COD, and detects the original size. For this reason.

The pressure plate 90 has a mirror surface and provides a density difference with the original so that the COD can correctly detect the original size. Here, the erasing means prevents toner from being deposited on the mirror surface portion and forming a visible image. Furthermore, some documents may be detected as missing due to their high density. For this reason, once it is detected that there is no document, the lighting voltage 1 judgment reference level etc. are changed and the briscan is performed again to detect the document size.

Furthermore, if the detected document setting position is more than a certain distance from the reference point, a message display warns that the document placement position is defective, and execution of the subsequent copy sequence is stopped. Similarly, when COD 1B detects that the document is placed diagonally, a warning is displayed and the device stops. Incidentally, the slanted placement of the original is detected from the coordinates of the corners of the original and the inclination of the edge of the original.

However, since the user may intentionally place the device in this way, the warning cancellation switch (not shown)
If the warning cancellation mode is selected, the copy sequence is executed even in the above-mentioned case. However, in this case, AMS and APS can be executed by determining the X and Y coordinates of the farthest point from the reference point as the document size. Of course, erasing means is required for the portion determined to be outside the document.

Furthermore, if there is only a shift in the Y axis (optical system scanning direction), an appropriate image can be obtained by automatically performing image shift and adjusting the scan timing and paper conveyance timing.

Furthermore, even if there is a warning, it may be possible to ignore the warning and copy by pressing the copy key again.

If either the selected cassette size or copy magnification is specified for the document size detected as above,
The other can be automatically calculated and determined (AMS
, APS).

Here, the paper size calculated from the original size and magnification is not necessarily a standard size, so in this calculation, the first condition is to use the minimum cassette size that includes this calculated paper size. In order to prevent the size from being interpreted as being too large due to a detection error, in the calculation process, the document size is made smaller (with some margin) in small increments. Specifically, , Y are all provided with a margin of several mm.

On the other hand, the appropriate magnification is determined by the original size and cassette size, but in general, changing the magnification from standard size to standard size (such as changing the size)
Therefore, if the detected document size matches or is approximately equal to the standard size, it is possible to select a unique magnification between these standard sizes in preference to the accurately calculated magnification. .

Furthermore, regarding the cassette size, in addition to the standard size provided by the manufacturer, there are many cases in which special sizes are frequently used by the user or by the person leaving the country. AMS, APS
In order to perform this, a vehicle is created in which the X and Y dimensions of these universal cassettes are also registered. As with the area specification, there are three possible setting methods.

First, enter the asterisk (*) mode to wait for input. At this time, an interactive message indicating one dimension is displayed on the message display.

“Universal l:X (vertical): mm.

Y (horizontal): mm” In the initial state where nothing is specified here, the maximum paper size such as A3 or LGR is set.

In this state, the dimensions in the X and Y directions are input in mm using the numeric keys.

In addition, the paper size is set on the document table 251 and the paper size is set using transparent electrodes, or the paper size is detected by CCD scanning.

It is also possible to register. CCD scanning is performed by the aforementioned area detection key (142). These detections and registrations are valid only in the universal cassette registration mode among the asterisk (*) modes.

In this way, it is possible to perform APS and AMS between non-standard document sizes, non-standard cassette sizes, and arbitrary magnifications.

'On the other hand, this copying machine has an area specification function.

AMS or APS can also be executed based on the size of the specified area and the cassette size or magnification instead of the document size.

Next, the magnification setting method will be described.

In this copying apparatus, fixed magnification selection keys 122.12
3. In addition to setting the magnification using the arbitrary magnification (zoom) selection key 125, automatic magnification selection key 124, etc., the magnification can also be set using a transparent digitizer on the document table. In this case as well, the magnification can be set by selecting the magnification setting mode using the asterisk (*) mode and specifying two points on the digitizer on the document table. That is, the magnification is set according to the ratio of the distance # from the point of the first press to the document reference point: the distance # from the point of the second press to the document reference point. 2
If you specify a point further away than the first press, you can enlarge the image, and if you specify a point closer to it, you can obtain a reduced image. This instruction will also be displayed on the message display.

“l push: 2 push = mm:
mm→-m-%" Also, using the numeric keypad, it is also possible to determine the magnification by substituting binary values in the same way. By these two methods of determining the magnification, the calculated magnification can be applied to the copying machine. With a 6-piece copying machine, it is possible to obtain the desired magnification by repeating up to two consecutive copies, so if it is not possible with just the first copy, the second copy can be made at the same time. The copy magnification can be specified as follows.

“000% 1st: Q○○%, 2nd: 00
0%" After making the first copy, set the scaled image on the document table, enter the displayed magnification, and make another copy to obtain a copy with the desired magnification.

Therefore, in this apparatus having a copying magnification of 50% to 150%, it is possible to specify a magnification of 25% to 225%.

Incidentally, after the first copy, the second magnification may be automatically set.

Further, the copy magnification can be determined by combining digitizer input and document detection by CCD. In other words, use the pen to specify the position corresponding to the size you want to enlarge or reduce with the digitizer, then set the original, detect the original size during prescanning, and determine the copy magnification from the ratio of the two sizes. good.

FIG. 16 is a flowchart for determining the copy magnification using a digitizer or numeric keypad. First, the first
For example, enter the coordinates corresponding to the size of the original using a light pen or numeric keypad (Step 1).
For example, the coordinates corresponding to the desired copy size are input (step 2).The coordinates are input by specifying a point diagonal to the origin on the platen glass. In addition, when inputting with the numeric keypad, only the X or Y coordinate is sufficient, and the copy magnification is calculated from the input coordinate 2 / coordinate 1 (
Step 3) Determine whether the calculated copying magnification is within the variable magnification range of the device Step 4) If within the range, display the magnification (Step 8); If outside the range, display 2. Find the square root of the calculated magnification to check whether it can be copied in batches (Step 5), check whether the value is within the range that allows for scaling (Step 6), and if it is within the range. The first and second copying magnifications are displayed using the obtained square root value as the copying magnification (step 9), and if they are outside the range, a warning to that effect is displayed (step 10).

If the first and second copy magnifications are the same, that is, the square root of the desired magnification, the second magnification setting becomes unnecessary.

In addition, the first and second copying magnifications do not need to be calculated using the square root, but the first copying magnification is the first copying magnification that is possible in one copying, and the first copying magnification is the first calculated copying magnification. The value divided by 2 may be used as the second copying magnification.Therefore, there are many combinations. Furthermore, it is clear that a wider range of magnifications can be obtained by copying 3 times or 4 times, unless image quality is taken into consideration.

Next, we will explain the control of copying operations, centering on the machine parts such as page quick copying, multiple copying, and area specification, in Figures 16-2 and 1.
This will be explained using the flowchart shown in Figure 6-3. In step 11, it is determined whether the copy start key is turned on, and if it is turned on, the copy routine is executed (step 12).

The 16th-:II copy routine will now be described. First, the copying magnification and copying density are determined, and the lens position, developing bias, etc. are adjusted (step 30.31).
And color selection viz.

Determine whether or not the color copy mode is set (step 32); if not, select the black developer (step 33); if the color mode is selected, select the color developer (step 34). ), then it is determined whether there is an area specification or not (step 35), and if there is an area specification, it is determined whether or not it is based on the cassette when changing the magnification (step 36); if it is not the cassette reference, it is the original reference, Since the area itself is scaled according to the magnification ratio, the area obtained by multiplying the set area by the copy magnification determined in step 30 is set as the set area (step 37). Therefore, the inside or outside of the area is removed. If so, all you have to do is turn on the blanking LED corresponding to this new area, and then check which mode the in/out key is in, i.e. whether it is inside or outside the area. If it is determined, step 38), if it is in mode, a flag is set to erase the outside of the area by controlling the blank exposure lamp (step 39), and if it is out mode, a flag is set to erase the inside (step 40). ).

In addition, if there is no area specified, the above control will not be performed, and it will be determined whether the mode is page snapshot (step 41). Step 42).

If it is an A copy, set the flag to perform an A scan (scanning the left half of the document placed on the document table); if it is not an A copy, perform a B scan (scanning the right half of the document). If the page is not a quick copy, scanning is performed according to the size of the document, and exposure, development, and transfer are performed according to the conditions determined by the above judgment.

A copying process such as fixing is executed (step 45).

The above is an explanation of the copy routine. Returning to FIG. 16-2 again, it is determined in step 12-1 whether or not it is a double-sided copy, and if it is a double-sided copy, the copy is stored in the intermediate tray with the copied side facing up (step 12-2). If not, it is determined in step 13 whether or not it is multiple copying, and if it is not multiple copying, the paper is ejected to the paper output tray.
4) If it is a multiple copy, store it in the intermediate tray with the copied side facing down (step 15), and check whether it is in the automatic color and area conversion mode, that is, the first and second copies. Automatic conversion of inner and outer edges of areas during copying It is determined whether the key 140 or 41 for automatic conversion of one color has been pressed (step 16), and if the automatic conversion mode is set, the inner and outer edges of the color and area are extracted. , convert the outside exclusion (step 17).

Then, it is determined whether the mode is continuous page copying (step 18), and if the mode is not continuous page copying, it waits for the manual copy start key input (step 20).
), if the page snapshot mode is selected, the copy routine is executed again (step 21).

FIG. 16-4 shows an example of a case where an area is specified and a variable size copy is made without outside.

(a) represents the original, and the dashed line 350 represents the specified area. When scaling is done based on the original, the area is also scaled as shown in (b), and the image fits within the scaled area without being missing. . However, when copying with variable size based on the cassette standard (C)
As shown in the figure, since only the image is scaled and not the area, part of the image may be missing.

Next, color conversion in double-sided copying in page quick copy mode will be explained. Place two originals (A4 size or smaller) on the original table and press the page quick copy/double-sided copy selection key 133.
When the automatic color changeover key 141 is pressed, a mode is set in which pages are quickly copied in different colors and double-sided copies are made. When the copy start key 151 is pressed in this mode, only the original placed on the left side is scanned, copied onto the front surface of the recording paper, and stored in the intermediate tray. At this time, the switch 41 is set on the upper side, and the recording paper is stored in the intermediate tray with the copied side facing up. Then, in order to change the color, the developing device is automatically replaced and the first document is scanned. At this time, the blank exposure lamp lights up while the first document is being scanned, and no latent image is formed on the first document.The recording paper stored in the intermediate tray is fed to the position of the registration roller, and two sheets are The recording paper is sent to the drum at the timing when the leading edge of the latent image on the original document coincides with the leading edge of the recording paper. Note that when a binding margin is formed, the timing may be accelerated or delayed accordingly. The right original image is then copied onto the back side of the recording paper and ejected to the outside of the machine. In this way, a double-sided copy with different colors on the front and back sides can be obtained.

Note that if the changer 41 is set on the lower side, the recording paper is stored in the intermediate tray with the copied side facing down, so multiple copies can be made with the originals on the left and the originals on the right in different colors. It will be done.

Furthermore, when performing double-sided copying or multiple copying, it is also possible to specify an area and copy.

Further, color conversion is possible even when not in the page snapshot mode, and in the multiplex mode or double-sided mode, the developing device is automatically replaced after the first scan, and the second scan is awaited.

(Operation of CCD) FIG. 17 is a circuit block diagram of this embodiment.
is a control microcomputer, 18 is a COD image Φ sensor, 401 is an A/D converter, and 402 is a CC
This is a D drive pulse generation circuit. 403 is a copy start signal from an external circuit, 404 is a document/area mode switching signal from an external circuit, 405 is a home position and signal from the optical home position sensor 15,
406 is the image tip signal from the image tip sensor 30, and 407
is the shift pulse signal of the CCD image sensor 18,
408 is a reference clock signal φ, 409 is a transfer lock signal φ1 of the CCD image sensor 18, 410 is a transfer lock signal φ2.411 is a reset pulse R3 of the CCD image φ sensor 18, and 412 is a transfer lock signal φ1 of the CCD image sensor 18. 18 output signal CCD 0tlT, 41
3 is the clock signal A/DCL of the A/D converter 401
K, 414 is the output A/ of the CCD image sensor 18;
This is the digital signal DATA after D conversion. 14 is a lamp for document illumination, 415 is a lamp dimming circuit, 416 is a lamp on/off signal, and 417 is dimming data.

The dimming circuit 415 is configured to apply a voltage proportionally corresponding to the value of the dimming data 417 to the lamp 14 .

To briefly explain the operation, first, microcomputer 4
When a copy start signal 403 is applied to 00 from the outside, a program for document detection and area recognition, which will be described later, is read from a ROM (not shown) and starts running.

First, the microcomputer 400 uses a built-in timer function to output the reference clock signal φ 408 and the A/D converter clock signal A/DCLK 413 to the pulse generator 402 and the A/D converter 401, respectively.

From the reference clock signal φ408, the COD drive pulse generation circuit 4.02 transfers locks φl409 and φ2-410, and reset pulse R3411.
is made. The output signal CC of the COD image sensor 18 driven by these clock pulses is
D0UT412 is converted to A by the A/D converter 401.
/D conversion, and its digital output DATA 414 is read from the input port of the microcomputer 400. The document/area mode switching signal 404, the home position signal 405, and the image tip signal 406 will be described in the explanation of the flowchart described later.

Further, when dimming for the COD image fist sensor 18 is required, the dimming circuit 415 turns on the lamp 14 in response to the lamp on/off signal 416. Microcomputer 400 is CO
A/D conversion value DA of the output signal of the D image sensor 18
While looking at TA414, read the dimming data CVRDATA4
17, the lamp 14 is dimmed to an appropriate brightness, and the value of the dimming data 417 at that time is stored.

Furthermore, when performing AE, the lighting voltage of the lamp 14 is controlled by changing the value of dimming data 417 using AE data, which will be described later, so as to obtain appropriate exposure.

FIG. 18 shows the shift pulse s h420. Transfer locks φ1・421, φ2@422, reset pulse R3, and CCD output signal CCD 0UT424
, A/D converter clock AD CLK425.
The 0 interrupt program, which is a timing diagram showing the phase relationship between the output DATA 426 of the A/D converter and the interrupt timing 4270, will be described later.

FIG. 19 is a diagram showing the relationship between CVRDATA and lamp lighting voltage.

FIG. 20 is a simple principle diagram of the document detection method. 40
3 is the shift pulse signal 5h of the COD image e-sensor
407.431 is the output value qc of the CCD image O sensor
cDOUT412.432 is the threshold level, 91
93 is a standard white board, 93 is a document storage reference position, 15 is an optical system home position sensor, 30 is an image tip sensor, 12 is a document table, 435 is a document, and 436 is an output of a COD image sensor by a microcomputer 400. This is the position for processing.

The reason why the output data of the COD image sensor is not all processed in each line as shown in the figure, but is processed at regular intervals is because the processing speed of the microcomputer 400 may be slow. Shifting the processing position line by line is a means of keeping the detection accuracy as low as possible.

FIG. 21 is a conceptual diagram of area designation by marking.

441 is an original manuscript, 422 is a dummy copy made from the original manuscript, 433t-1 is a dummy copy with markings, and 444 and 445 are obtained copies.

To explain the procedure, first set the original document 441 on the document table, perform the copy operation in dummy copy mode, and make a thin gummy copy 4 with colored toner such as red.
Get 22.

For this dummy copy 422, specify the area you want to specify by 4
Set the dummy copy marked with a black marker or the like as shown in 43 on the document table, scan the optical system in the area recognition mode, and detect the marked area. Original manuscript 4
By setting 41 on the document table and copying by specifying the inside and outside of the area, copies such as 444 and 445 can be obtained.

446 indicates the name of each part when a marked document is processed by a document detection and area recognition program to be described later, and 451 to 456 are stages 1 to 6, respectively.

FIG. 22 shows the main flow of the document detection and area recognition program. This program will be executed when the need for document detection or area recognition occurs during the copy sequence.

This flowchart will be explained according to FIG. 0, in which the entire control program is set. First, when the need for document detection or area recognition as described above occurs, the program according to this flowchart is executed from step 1. In step 2, first, the reference clock φ408 and the A /D converter clock pulse A/DCLK 413 is output. In this embodiment, both the two clock pulses are output to the microcomputer 40.
4. Next, in step 4, wait for the optical system home position signal 405, and if the signal is detected, proceed to step 5, and this time send the image tip signal 406. If the waiting 0-picture ahead signal 406 is detected, in step 6, the interrupt is enabled. Then, in step 7, the process waits until the document or area detection completion flag is set. If it is set, the program is exited from step 8 and continued with another program.

FIG. 23 shows a part of the interrupt routine of the document detection and area recognition program, and the flow is executed at the timing shown in FIG. 18. When a 0 interrupt occurs, the main flow starts from step 9. In step 10, a clock counter that counts the number of output data outputted in time series from the COD image sensor for each column is counted up.

Then, in step 10, it is determined whether it is the timing to output the shift pulse 407 based on the value of the clock counter. If the timing is right, the process jumps to the sh line as shown in step 22. If not, step 12
It is determined from the flag whether the program currently being executed has multiple interrupts. Step 2 if multiple interrupts
Jump to step 1 to extract it from the interrupt program. If not, proceed to step 13 and compare the sample point value and clock-counter value to see if it is the data read position (timing) (do they match? ). If the sample point value and the clock counter value are different, the process jumps to step 21 and is extracted from the interrupt program. If they match, it is determined that the reading position is reached, and the process proceeds to step 14, where the original/area signal 404 is used. , determines the mode. If it is area detection mode, step 23
As shown in , the routine jumps to the area detection mode. If it is the document detection mode, the process advances to step 15 and the A/D conversion value of the COD image sensor output and the set threshold e
By comparing the level values, it is determined whether the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. If there is no manuscript, jump to step 18; if there is a manuscript, go to step 1
In step 16, the clock counter value Xmaxl is stored in the buffer. This value is 1
It is updated every time there is a document in a line, and eventually the clock counter value at the time of the data that was finally determined to have a document among the data in that line will be updated for each line. It will be remembered.

Next, in step 17, all the lines processed so far, the maximum and minimum values of the clock counter when it is determined that there is a document, XmaX, Xm1n, and the maximum and minimum values of the line Φ counter Value, Ymax, Ymi
Compare n with the current clock counter and line counter values, and update if necessary.

Next, in step 18, the A/D converted value of the COD image Φ sensor output is stored in a buffer for one line. In step 19, it is determined based on the value of the clock counter whether 1947 minutes of data processing has been completed, and if it has not been completed, the sample point, which is the collection position of AE data, is updated in step 20, and then step 21 is performed. Exit the interrupt program. If it has been completed, in step 24, among the A/D conversion values of the COD image sensor output for one line, the data from the first data determined to be present to the last data determined to be present is calculated. AE data φ counters corresponding to the maximum and minimum values are counted up from within. However, if an area for AE data collection is set, the AE data counter will only be counted within that area.
Do an up.

The AE data counter is prepared for all possible values, including the maximum value and minimum value of each line, and serves as data for performing AE.Next, in step 25, the value of Xmaxl is calculated. It is stored in a RAM specific to this line so that it will not be updated in the next line processing. Then, remove the interrupt program from 21.

FIG. 24 is a part of the interrupt routine of the document detection and area recognition program. If it is the area detection mode in step 14 of FIG. 23, the process jumps to step 26 of this figure as shown in step 23.
It is determined by the flag whether it is the first stage in FIG. 1, and if it is the first stage, it jumps to the 5EQI routine as shown in step 35. Step 30. 21 in FIG. 21, respectively. 3rd゜4th. Determine whether it is the fifth stage based on the flag, and if YES in each case, step 36. Step 37゜Step 38. 5EQ2 as in step 39.

5EQ3.5EQ4.5Jump to EQ5 routine. If no, proceed to the next step.

In step 32, it is determined whether data processing for one line has been completed based on the value of the clock counter,
If it has been completed, the process jumps to step 34 and exits from the interrupt program; if it has not finished, the sample point is updated in step 33, and then the process proceeds to step 34, where the interrupt program is extracted.

FIG. 25 is a part of the interrupt routine of the document detection and area recognition program. Figure 24 Step 27. Step 28. From Step 29°, Step 3Q, and Step 31, Step 41 of this figure. Step 45. Step 49
．． Step 54. Jump to step 58.

Jumping to step 41, in step 42 C
The A/D conversion value of the OD image sensor output is compared with the set threshold level value to determine whether the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. to decide. If there is no manuscript, jump to step 44, and jump to step 40 in FIG.
If there is a document, a second flag is set in step 4'3, and the process jumps from step 44 to step 40 in FIG. 24.

Jumping to step 45, in step 46 C
The A/D conversion value of the CD image e-sensor output is compared with the set threshold level value to determine whether it is the level of dark spots. If it is not at the level of black spots, the process jumps from step 48 to step 40 in FIG. 24, and if it is at the level of black spots, the flag is set to the third stage in step 47, and the process jumps from step 48 to step 40 in FIG.

When the process jumps to step 49, it is similarly determined in step 50 whether there is a document, and if there is no document, step 5
3 and jump to step 40 in Figure 24. If there is a document, proceed to step 50, and set Xm1n, Xmax, Ym
tn.

Compare and update the value of Ymax, current line counter, and clock counter. 0 Next, in step 52, set the flag to the 4th stage, and jump from step 53 to step 40 in FIG. 24. Jump to step 54. Similarly, in step 55, it is determined whether the level is black, and if the level is not black, the process jumps from step 57 to step 40 in FIG. Then, the process passes through step 57 and jumps to step 40 in FIG.

If the process jumps to step 58, it is determined in step 59 whether or not there is a similar original, and if there is no original, step 62
Then jump to step 40 in Figure 24. If there is a manuscript, set Xmin, Xmax, Ymin in step 60.
, Ymax with the current line counter, clock-counter values and update. Then, in step 61, the flag is set to the sixth stage, and then the process jumps to step 40 in FIG. 24 through step 62.

FIG. 26 is a part of the interrupt routine of the document detection and area recognition program. If it is determined in step 11 of FIG. 23 that it is time to issue a shift pulse (40?), the process jumps to step 33 of the figure as shown in step 22. Then, in step 64, a shift pulse 407 is outputted at the timing shown in FIG. In step 65, a line counter is counted up, and in step 66, it is determined from the value of the line counter whether the last line to be processed has been completed, and if it has been completed, the process advances to step 67 and the shifter pulse 407 is output. is fixed to high, interrupts are disabled in step 68, AE data is created in step 69, the interrupt program is extracted in step 72, and if it is determined in step 66 that the program is not finished, the process proceeds to step 70. , sample point, and l line end values are set, counters, etc. are initialized in step 71, and the interrupt program exits from step 72.

FIG. 27 shows the main flow of a document detection and area recognition program when using page memory. The entire control program is set up so that one program is executed when the need for document detection or area recognition occurs during the flow of the copy sequence.This flowchart will be explained according to the diagram shown in FIG. When the need for detection or area recognition arises, a program according to this flowchart is executed from step l. In step 2, first, various counters (clock counter, line counter), etc. on the RAM are initialized. Next, in step 3, in order to generate various pulses to drive the CCD image sensor, the reference clock φ
-408, and the clock pulse of the A/D converter - 0 that outputs A/D CLK413 In this embodiment, both the two clock pulses are the microfist computer +0
6) Oscillated by the built-in timer function (with interrupt function) Next, wait for the optical system home position signal 405 in step 4, and if the signal is detected, proceed to step 5 and wait for the image tip signal 406. If the 0-picture ahead value number 405 is detected, in step 6, the interrupt is enabled. Then, in step 7, wait until the document or area detection completion flag is set. If it is set, in step 8, read out the COD output data on the page memory in order, and in step 9, check whether it is area A (FIG. 21). If so, in step IO, the AE data counter corresponding to that data in area A is set as
AE corresponding to that data in area B (Figure 21) in step 13 if area A is not area A.
Count up the data counter. Steps 8 to 11 are repeated until all data are processed in step 11, and once the processing is completed, the program is exited from step 12 and ends.

FIG. 28 is a part of the interrupt routine of the document detection and area recognition program, and is a flow executed at the timing shown in FIG. When an interrupt occurs, the main flow starts at step 14, and at step 15, a clock is started that counts the number of output data for each column outputted in time series from the COD image sensor.
Count up the counter.

Then, in step 16, it is judged from the value of the clock counter whether it is the timing to output the shift pulse 407, and if the timing is right, the process jumps to the sh line as shown in step 27. If not, the process jumps to the sh line as shown in step 27. Is the currently running program causing multiple interrupts?
Judge by flag. Step 2 if multiple interrupts
The program jumps to step 6 to extract the interrupt program, and if not, the program advances to step 18, where it is determined whether or not the data is at the read position by comparing the sample point value and the clock counter value. If the sample point value and the clock counter value are different, the process jumps to step 26 and is extracted from the interrupt program. If they match, the reading position is determined and the process proceeds to step 19, where the document/area signal 404 is extracted. The mode is determined based on this. If the area detection mode is selected, the process jumps to the area detection mode routine as shown in step 28. If the document detection mode is selected, the process proceeds to step 20 where the A/D conversion value of the CCD image sensor output and the certified threshold level value are determined. By comparing , it is detected whether or not the document is located on the document table 12 at the position indicated by the current line counter and clock counter values. If there is no document, the process jumps to step 23, and if there is a document, the process proceeds to step 21. In step 21, the value of the clock counter is stored as X m a x 1 in the buffer. This value is updated every time there is a document in one line, and finally, the clock-counter value at the time of the last data that was determined to have a document is the value for each line. Everything will be memorized.

Next, in step 22, all the lines processed so far and the clock at the time of the data judged to have a document are
Maximum value, minimum value of counter value Xmax, Xm
f n, and the maximum and minimum values of the line counter values,
Compare Ymax and Ymin with the current values of the clock counter and line counter, and update if necessary.

Next, in step 23, the A/D converted value of the COD image sensor output is stored in a buffer for one page. In step 24, it is determined based on the value of the clock counter whether 1247 minutes of data processing has been completed, and if it has not been completed, the sample point is updated in step 25, and then passed through step 26 to interrupt step 29. Line minute COD image sensor output A
Of the /D conversion values, the value of Xmaxl, which is the last data indicating that there is a document, is stored in a RAM specific to this line so that it will not be updated in the next line processing. Then, the interrupt program exits from step 26.

FIG. 29 is a part of the interrupt routine of the document detection and area recognition program. If it is the area detection mode in step 19 of FIG. 28, the process jumps to step 30 of this figure as shown in step 28.
It is determined by the flag whether it is the first stage in the diagram, and
If it is, jump to the 5EQI routine as shown in step 39, similarly step 32, step 33. Step 34. 21 in FIG. 21, respectively in step 35. 3rd゜4th. Determine whether it is the fifth stage based on the flag, and if YES in each case, step 40. Step 41゜Step 42. 5EQ2 like step 43.

Jump to the 5EQ3.5EQ4.5EQ5 routine, and if No, proceed to the next one.

In step 36, it is determined whether 1947 minutes of data processing has been completed based on the value of the clock counter,
If it has been completed, the process jumps to step 38 and exits from the interrupt program; if it has not finished, the sample point is updated in step 37, and then the process advances to step 38 to exit from the interrupt program.

FIG. 30 is a part of the interrupt routine of the document detection and area recognition program. Figure 29 Step 39. Step 40. Step 41゜Step 42. From step 43, step 45 of this figure. Step 49. Step 53
．． Step 58. Jump to step 62.

Jumping to step 45, in step 46 C
The A/D conversion value of the OD image sensor output is compared with the set threshold Φ level value, and it is determined whether the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. Please judge. If there is no original, the process jumps to step 48 and then to step 44 in FIG. 29. If there is a document, the flag is set to the second stage in step 47, and the process jumps from step 48 to step 44 in FIG.

Jumping to step 49, in step 50 C
The A/D conversion value of the OD image sensor output is compared with the set threshold level value to determine whether it is a dark spot level. If it is not at the black spot level, the process jumps from step 52 to step 44 in FIG. 29. If it is at the black spot level, the flag is set to the third stage in step 51, and the process jumps from step 52 to step 44 in FIG.

When the process jumps to step 53, it is similarly determined in step 54 whether there is a document, and if there is no document, step 5
7, and then jump to step 44 in Figure 29. If there is a manuscript, proceed to step 55, and set Xmin, Xmax, Y
min.

Ymax value, current line counter, clock
The value of the counter is compared and updated. Next, in step 56, the flag is set to the fourth stage, and the process jumps from step 57 to step 44 in FIG.

When the process jumps to step 58, it is similarly determined in step 59 whether the level is a black spot, and if the level is not a black spot, the process jumps from step 61 to step 44 in FIG. 29. If the level is a black spot, the flag is set to After setting the level to 5, the process passes through step 61 and jumps to step 44 in FIG.

When the process jumps to step 62, it is similarly determined whether or not there is a document, and if there is no document, the process jumps to step 66 and then to step 44 in FIG. 29. If there is a document, in step 64, Xm1n is executed.

Set Xmax, Ymin, Ymax to the current line.
Compare and update the value of the counter and clock counter. Then, in step 65, the flag is set to the 6th stage, and then the process passes through step 66 to step 4 in FIG.
Jump to 4.

FIG. 31 is a part of the original detection and area new style program interrupt routine. If it is determined in step 16 of FIG. 28 that it is time to issue the shift pulse 407.

As shown in step 27, the process jumps to step 67 in the figure. Then, in step 68, a shift pulse 407 is outputted at the timing shown in FIG. In step 69, the line e counter is counted.
Then, in step 70, it is determined from the value of the line counter whether the last line to be processed has been completed, and if it has been completed, the process proceeds to step 74, where the output of the shift pulse 407 is fixed at high. At step 72, interrupts are disabled, and at step 73, AE data is created, and at step 76, the interrupt program is extracted.

If it is determined in step 70 that the process has not been completed, the process proceeds to step 74, where values of the sample e point and l line end are set, and counters and the like are initialized in step 75, and the interrupt program exits from step 76.

FIG. 32 is a flowchart of the dimming program. When a sequence requires dimming for the CCD image sensor, a program according to the tree flowchart is executed. In step 2 following step 1, the lamp is first turned on by a lamp on/off signal. At this time, the dimming data takes a preset value at step 3.
Reference clock φ-408, A/D converter
Clock, A/D CLK413, shift pulse 5
h407 is output and the CCD image sensor is driven.In step 4, it is determined whether an overflow has occurred based on DATA414 of the A/l) conversion value of the output of the COD image number sensor. If an overflow has occurred, proceed to step 5, count down the dimming data 417 by 1, return to step 4, and continue this loop until there is no overflow.If no overflow is observed in step 4, proceed to step 4. The process proceeds to step 6, where the dimming data is counted up.Next, an overflow check is performed at step 7, and the process returns to step 6 until an overflow occurs. When an overflow occurs, the process proceeds to step 8, where the dimming data is stored, and the dimming program is stored in step 9. Next, a method for writing characters on copy paper will be explained with reference to the drawings. In FIG. 33, 1 is a photosensitive drum that rotates in the direction of arrow A in the figure.

Reference numeral 12 denotes a document table glass, and 45 denotes a moving optical system (scanner) that moves in the left and right directions in the figure. Reference numeral 14 denotes a lamp for document verification, which moves together with the moving optical system 45. Arrow B indicates the optical path.

23 is a blank exposure unit (erasing means).

FIG. 34 shows 23 blank exposure units, 701a is a fine LED, and high density e.g. 4d
A plurality of LED arrays 701 are arranged in an array along the axial direction of the photosensitive drum 1 at a size of
). Moreover, a SELFOC lens array (not shown) is disposed above it to form an image of the light from the LED 701 onto the photoreceptor. Reference numeral 702a indicates relatively large LEDs, and a plurality of LEDs are arranged along the axial direction of the photosensitive drum l at a pitch of, for example, 2.5 mm (hereinafter referred to as blank LEDs).
D 702).

In FIG. 35, 705 is a slit device provided in the moving optical system 45, 704 is a slit, and 703
708 is the slit device 705 and the shielding material 703
Also, the shielding material 703 is a rod 707
is connected to solenoid 706. When the solenoid 706 is energized, the shielding material 703 moves along the dashed line 7 in the figure.
Move to position 03', block a part of Surin) 704,
It is designed to cut out part of the light that is exposed to the original. On the other hand, when the solenoid 706 is de-energized, the force of the spring 708 causes the shielding member 703 to return to the position indicated by the solid line in the figure, so that it no longer blocks exposure of the original.

FIG. 36 shows the irradiation area on the drum 1 by document exposure, blank LED, and LED array.

730 Area illuminated by LED array, 7
31 is an area illuminated by a blank LED.

732 is an original exposure irradiation area when the solenoid 706 is not energized, and 733 is an original exposure irradiation area when the solenoid 706 is energized. 730 and 73
The areas 1, 730, and 733 overlap to some extent. Also, the side marked with a mark in the diagram is the transfer paper feed port (
The paper is conveyed with its edge aligned here, regardless of the paper size. Therefore, the LED is placed on the reference side of the transfer paper.
By arranging the array 701, it is possible to arbitrarily write characters, etc., regardless of the transfer paper size and transfer magnification.

Regardless of image exposure, a white latent image is formed in the area 730 if all the LED arrays 701 are lit, and in the area 731 if all the blank LEDs 702 are lit. Also, if the solenoid 706 is not energized and the LED array 701 and blank LED 702 are all turned off during document exposure, 7
A latent image of the document is formed over the entire area 32. On the other hand, when exposing the original, the solenoid 706 is energized and the blank LED 7 is turned on.
When the light 02 is turned off, a latent image of the document is formed in the area 733. or.

Since no light from exposure of the original is incident in the area 730, a latent image of a pattern such as a desired character can be formed by synchronizing the LED array 701 with the process speed and sequentially and selectively turning on the LED array 701. . Note that writing a pattern such as a character by selectively lighting the LED array 701 is called a writing mode.

FIG. 37 shows the state after transfer when patterns such as characters are formed on copy paper (transfer paper).

The arrow indicates the direction of movement of the transfer paper 734, desired characters (patterns) are copied in the area 735, and the original image is copied in the area 736. FIG. 38 shows an example of a lighting pattern of the LED array 701, and in FIG. 38, 8×8 dots are shown for ease of explanation. In the figure, 1 indicates the lighting state of the microLED, and 0 indicates the non-lighting state. 1 to 8 in the diagram are LEDs
For the individual LEDs of array 701, arrows indicate time series (time t
) is shown. FIG. 39 shows a timing chart for creating patterns such as characters.

In this example, the number °“2” will be written.

Furthermore, if a pattern obtained by rotating the pattern shown in FIG. 38 is provided, for example, II 2 II can be rotated at various angles and written.

FIG. 40 shows an operating unit for actually executing a write operation using the LED array 701.

Incidentally, this operating section may be provided in the operating section shown in FIG. 10. 7
50-755 LED display element, 756 is dot matrix LCD (liquid crystal display),
757 to 764 are key switches. Key 757 in the diagram
．． 758.

759 is a mode specification key for selecting what to write, and when key 757 is pressed, LED 750 lights up.
It is possible to write the date. Furthermore, when the key 758 is pressed, the LED 751 lights up, allowing the page to be written. When the key 759 is pressed, the LED 752 lights up and it becomes possible to write a serial number.

The key 760 is a key to set the numerical value to 1" when in the page and serial number writing mode. The key 761 is a key for specifying the position and direction in which characters are written. As shown in FIG. You can specify the position and direction of the document.Each press rotates the state from 41-1 to 41-6.This allows you to write characters on the desired edge by changing the orientation of the document. When the enable key 762 is pressed, the LED 753 lights up and the written character becomes negative.

For example, the light emission pattern “°1” and “0゛” in FIG.

If you reverse it, "2" will be written in white on a black background.Press the key 763 to change the color of the characters to be written and the color of the document.When the key 763 is pressed, the LED 7 will light up.
54 lights up. 764 is a key pressed when writing (designating write mode), and LED 755 lights up.

By pressing this key again, the LED 755 turns off and the write mode is canceled. Reference numeral 756 is an LCD that displays written contents, and for example, when in date mode, the date is displayed. Also, when the position and direction are changed using the key 761,
It will be displayed in the corresponding position and direction.

This situation is shown in FIG. In the figure, 42-1 to 4
2-6 corresponds to the writing positions of the transfer paper 41-1 to 41-6 shown in FIG. 41 described above. 756 is the aforementioned L
It's a CD.

FIG. 43 shows an example of a control circuit for writing characters and patterns in this embodiment, in which 770 is a CPU (central processing unit) consisting of a microprocessor, 771 is a CPU
LCD driver connected to U771, 756 is the aforementioned L
It's a CD.

780 is the aforementioned key switch 757-764.780b
is LED driver, 780a is LED 750-755
It is. 781 is a timer circuit and functions as a clock. 772 is a drive circuit for driving the LED array 701, and is capable of selectively lighting each of the minute LEDs. 774 is a drive circuit for driving the blank LED 702, and each LED of the blank LED 702 can be turned on arbitrarily under control from the CPU 770.

776 is a solenoid drive circuit, and 70B is the aforementioned solenoid. 778 is a lamp lighting circuit for lighting the lamp 14.

The solenoid 706 and lamp 14 can be turned on and off under the control of the CPU.

First, a mode in which writing of characters, etc. is not performed will be explained.

The time chart is shown in FIG. 44. The drum starts rotating by the copy start, and the blank LED 702,
LED array 701 lights up. Ramp 1 after the end of the previous rotation
4 lights up, and the optical system 45 starts moving forward. sensor 30
After a time Tl corresponding to the distance between the optical axis and the blank unit from the image tip signal output from the blank LED 702,
When the LED array 701 is turned off, image exposure is performed on the photosensitive drum and formation of a latent image is started. When the optical system reaches the inverted position, the lamp 14 is turned off and the blank LED 70 is turned off.
2. Turn on the LED array 701. This prevents unnecessary images from being formed when the optical system moves backward. When the optical system is reversed and returned to the home position, the l cycle is completed.

Next, the operation for writing characters on the leading edge of the transfer paper as shown in FIG. 41-1 will be explained.

FIG. 45 shows the time chart. The shaded area in the diagram is L.
This shows that the ED array 701 is selectively turned on. Blank LED 702, LE due to copy start
The D array 701 lights up and performs forward rotation, and at this time, the solenoid 706 is energized. The optical system starts moving forward.

After T1 time from the image tip signal, the blank LED 702 goes out, and the LED array 701 starts selectively turning on synchronously to form a character latent image. At time A when a predetermined character has been formed, the LED array 701 is fully lit.1. Turn off solenoid 706. After 12 hours from timing A (time that takes into account the response of the solenoid), the LED array 701 is completely turned off, and the original image is also copied onto the edge of the transfer paper. This sequence prevents unnecessary stains from occurring at the border between the text area and the original area at the edge of the copy paper. When the optical system comes to the inverted position, the lamp 14b 4A
T W n 7 1 Lights up all lights 701. One cycle ends when the optical system returns to its home position.

Next, the operation when writing characters on the trailing edge of the transfer paper will be explained. The time chart is shown in FIG. 46. When the copy starts, the blank LED 702 and the LED array 701 light up, and the pre-rotation is performed. After the pre-rotation ends, the lamp 1
4 lights up and the optical system moves forward. After T1 time from the image tip signal, the blank LED 702 and the LED array 701 are turned off. Furthermore, T3=((transfer paper size - character length)/
After the process speed - T2) time has elapsed, solenoid 7
．． 06 is turned on, and the LED array 701 is fully lit.

Further, after time T2 has elapsed, the LED array 701 is synchronously and selectively started to light up to form characters and the like. When the optical system reaches the inverted position, the lamp 14 is turned off, the blank LED 702 and the LED array 701 are all turned on, and the solenoid 706 is turned off. When the optical system 45 returns to its home position, one cycle ends.

As described above, desired characters can be imprinted on the front or rear of the transfer paper. Furthermore, by changing the writing timing of one character, it is also possible to write a character in the middle of the transfer paper.

A timing chart in this case is shown in FIG. When the copy starts, the blank LED 702 and the LED array 701 light up. After the previous rotation is completed, the lamp 14 is turned on and the optical system starts moving forward. After a time T1 has elapsed since the image edge signal, the blank LED 702 and the LED array 701 are turned off, and a latent image of the document begins to be formed over the entire surface. After 19 hours corresponding to the writing position have elapsed, the solenoid 706 is turned on and the LED array 701 is fully lit. Further, after the elapse of time T2, the LED arrays are sequentially selectively turned on to form a desired character latent image. After completing the formation of the specified character latent image,
The solenoid 706 is turned off and the LED array 701 is turned on. After time T2 has elapsed, the LED array 701
Turn off the light and start exposing the edges of the document again. When the inversion position is reached, the lamp 14 turns off, and the blank LED 702,
The LED array 701 is fully lit. One cycle ends when the optical system returns to the home position.

Next, each mode of writing contents will be explained.

When in date mode, always write the date of the day.

In the page mode, after copying a predetermined set number of sheets for one document, the number of pages is increased by one. Therefore, each time the original is replaced, the page number written is 1.
The pages will be uploaded one by one, and a predetermined number of pages will be automatically written on the transfer paper.

In the case of serial number mode, when a predetermined number of copies are made for one document, the serial number is incremented for each copy.

It is reset to "l" when copying the next original starts. Therefore, consecutive numbers are automatically assigned to copies of one original. Further, for the next copy of the original, the successive numbers can be automatically incremented sequentially starting from ■. FIG. 48 shows a flowchart after copy start.

In FIG. 48, the write register is a register for storing data related to various modes, and the contents set here are written on the transfer paper by the LED array 701 as described above. There is. The PAGE register is a register for recording the page number.

Further, this register is set to "IT" at the initial time and when the page mode is newly switched. First, the operation in date mode will be explained. step 800
It is determined whether the mode is date mode or not, and here it is YES.
Therefore, in step 801, the date is set in the write register. In step 805, it is determined whether one cycle has ended or not, and the loop of step 805 is repeated until the result is YES. When one cycle is completed, the process advances to step 806, and it is determined whether or not the serial number mode is set. In this case, the answer is No, so go to StellazeΩ.
It is determined whether or not the 4+b remainder has been completed, and if NO, the loop of steps 805-806-808 is repeated.

When the set number of sheets is completed, the process advances to step 809, where it is determined whether or not the page mode is set.In this case, since the answer is No, the series of processes is ended.

Therefore, in the date mode, the date is always set in the write register, and the date is written in a predetermined position above the transcription.

Next, the case of page mode will be explained.

It is determined NO in step 800 and YES in step 802.
Since it is judged as S, the process advances to step 803 and the contents of the PAGE register are set in the write register.0 For example, if it is immediately after switching to page mode, "l11" is set in the write register.Then, as described above, 1 is set in the write register. Repeat the loop of step 805 until the cycle ends; after the cycle ends, step 806 to step 80
8, it is determined whether or not the set number of sheets has been completed. The loop from step 805 to step 806 to step 808 is repeated until the set number of sheets is completed. After the set number of sheets is completed, the process proceeds to step 809, where it is determined whether or not the page mode is set.

In this case, the answer is YES, so edit the contents of the PAGE register.
The process ends after adding .degree. and incrementing the value of the PAGE register.

Therefore, in the page mode, the same number is always written for the set number of copies of the same original (in this case, it is "l"), and when the next copy command is input, steps 800 to 802 to The process proceeds to step 803, where the number added by "1" from the previous time (in this case, "2") is set in the write register, and "2" is written on the transfer paper.

Next, the case of serial number mode will be explained.

When copying is started, the process proceeds from step 800 to step 802 to step 804, and "l" is written to the write register.
II is set. Step 80 after completion of l cycle
At step 6, it is determined whether or not it is the serial number mode, and since the answer is YES here, the process proceeds to step 807, where "1" is added to the contents of the write register to become "°2".The process continues until the set number of sheets is completed. Step 808~Step 805~Step 8
The loop from step 06 to step 807 is repeated, and the number written on the transfer paper is incremented every cycle. When the set number of copies have been completed, steps 809 to E
The process moves to ND and ends the process. Therefore, in the serial number mode, numbers are written sequentially starting from 1 for the set number of identical originals. Similarly, for the next series of copies, numbers are written sequentially starting from 1.

Next, a two-color mode, that is, a case where the colors of the writing area for characters and the like and the original image area are changed will be explained.

In this case, the written portion is first exposed (at this time, the blank LED 702 is lit) and developed in red. Thereafter, the document is exposed to light using a multiplex copying mechanism (at this time, the portions that have already been written are rendered white by the LED array 701), and the document is developed using a black developer.

FIG. 49 shows a timing chart for two-color mode.

The drum rotation starts with the copy command.

The blank LED 702 and the LED array 701 are turned on. After the previous rotation is completed, the LED array 701 is sequentially and selectively turned on while the blank LEDs 702 remain fully lit to form a latent image of a pattern such as a character for a period of time T4. Further, at this time, while the red developing device performs development, if the registration roller is started at an appropriate timing, the characters appear in red at the desired position on the transfer paper. In this sequence, the optical system 45 does not perform scanning.

Lamp 14 also does not light up.

Next, the transfer paper on which characters have already been written is stored in the intermediate tray, and the second copying sequence begins. The optical system 45 starts and the lamp 14 lights up. Blank LE at this time
D702, the LED array 701 is turned on after a time T1 has elapsed since the output of the 0-pixel signal, the blank LED 702 is turned off, and furthermore, after the time T4 has elapsed since the last character was written,
The LED array 701 is turned off. Optical Co. 2, is h
De ^;
→ SO i-14 Sei (1^ stroke 1 blank LED7
02. LED array 701 lights up. When the optical system 45 returns to its home position, one cycle ends.

Moreover, the following configuration can be considered as another embodiment. In the above-mentioned embodiment, the LED array for writing patterns such as characters also served as a black eraser for unnecessary image areas. However, at present, LED arrays with high dot density are
The amount of light is small compared to ED, etc. Therefore, for example, when backing up the optical system, there is a difference in the amount of light irradiated to the drum when the LED array and blank LED are used to erase black, and there is no unnecessary light on the photoreceptor. There may be cases where charges remain. In other words, after continuing the writing mode for a long period of time, a proper image cannot be obtained.

To solve this problem, an LED array for pattern writing and a blank LED for erasing black may be provided independently.

FIG. 50 is a drawing of the vicinity of the drum, where ■ is the drum, 980 is a blank LED for blacking out, and 981 is an LED array for writing. Figure 51 shows blank LED 980 for black erasure.
In this example, LEDs 990 are arranged at a pitch of 2.5 mm.

FIG. 52 shows the irradiation area on the drum surface.

The blank LED 980 for blackening can illuminate a range 991, that is, the entire surface of the drum. On the other hand, the LED array 981 can only illuminate an area 992 in the figure. Here, the case where characters are displayed on the leading edge side of the transfer paper will be explained.

FIG. 53 shows the timing chart.

Blank LE0980 lights up when the copy starts,
Solenoid 706 is energized. After the pre-rotation is completed, the lamp 14 is turned on and the optical system 45 moves forward.

After time T1 has elapsed since the image tip signal, the blank LED 980
At the same time as turning off, the LED array 981 is completely lit.

Blank LED 980 and LED array 9 shown in FIG.
After time T5 corresponding to the distance 81 has elapsed, the LED array 981 is sequentially and selectively turned on to start forming a character latent image.

At the time B when writing a predetermined character is finished, the LED array 9
81 is fully lit and the solenoid 706 is turned off. Response time and optical axis of solenoid 706 - LED array 9
LED after the elapse of time T6, which is the sum of the travel time between 81 and 81.
All arrays 981 are turned off. When the optical system reaches the inverted position, the lamp 14 goes out and the blank LED 980 lights up. One cycle ends when the optical system returns to its home position. In this way, by providing a blanking means for blackening and a separate pattern writing means, when an unnecessary image disappears, such as when the optical system moves backward, the drum is irradiated with uniform light and a good image can be obtained.

Moreover, with this configuration, the following can also be done.

As mentioned above, this method uses the multiple copy mode to overlap text and original images. As mentioned above, the amount of light from the LED array tends to be insufficient, so if the process speed is determined based on the performance of the LED array, the specifications of the entire machine will deteriorate.

The above drawbacks can be overcome by changing the process speed during character writing and the process speed during document exposure.

An example of outputting characters on the leading edge of the transfer paper will be described below.

First, the character writing cycle is performed at a relatively low process speed, and then the document is exposed at a relatively high process speed and multiple copies are made. Figure 54 shows the timing chart. In Figure 0, the shaded area is a blank LED 980. shows a state in which only the irradiation area 992 shown in Fig. 52 is off, and the horizontal line indicates a state in which only the irradiation area 992 shown in Fig. 52 is lit. The drum starts rotating at the same speed, and the blank LED 980 and LED array 981 light up. At this time, the high voltage output is output at a value for low speed. The forward rotation ends. 〉 -p 'y h T
W n Q Q n F+ −'JIM
ilA h After one hour T5 has elapsed, the LED array 981 is sequentially selectively turned on and begins to form a character latent image.

At point 0 at which the output of a predetermined character is completed (after T7 has elapsed), the blank LED 980 and the LED array 981 are fully lit. After 16 hours have passed, the LED array 981 is completely turned off. The registration roller turns on at a predetermined timing,
Characters are formed on the leading edge of the transfer paper. Once the transfer paper reaches the intermediate tray, the next sequence begins and the drum begins rotating at a relatively high process speed. Also, at this time, the high voltage output is output at a value for high speed. When the forward rotation is completed, the lamp 14 is turned on and the optical system 45 is turned off except for a part of the blank LE0980 after a time T1 has elapsed from the 0-picture point ahead where the optical system 45 starts moving forward.

After T8±77+75 hours, all blank LEDs 980 are turned off. This sequence forms a white latent image in the area where characters were written in the first cycle, making it possible to clearly write characters regardless of the original. After that, when the optical system 45 comes to the inverted position, the lamp 14 is turned off and the blank LED 98 is turned off.
0 lights up. After that, the optical system returns to the home position, and the 1 cycle ends.

Further, in one or more of the embodiments, the pattern writing LED is provided only in a part of the image area, but it may of course be arranged over the entire image area.

In addition, a mechanical shutter was provided in the slit as a means for blocking image exposure, but this shutter may be located near the photoreceptor, or may be a shutter used in a liquid crystal, or an LED array may be used as a writing light source. Although we used a light source and a liquid crystal shutter, it is also possible to use a light source and a liquid crystal shutter.

Next, the image composition mode will be explained.

In this embodiment, an example will be described in which images are synthesized from an A4 size double-sided document onto one side of an A3 size transfer material.

After setting the original on the RDF 9, press a predetermined key on the operation unit 11 to separate (do not overlap) two images of the double-sided original on the same side of one transfer material from the double-sided original and form images. Set the mode to perform. After selecting the cassette containing the A3 size transfer material, turn on the copy start key.

The original 10 set on the RDF 9 is conveyed and set at an image reference position on the original glass 12. The situation is shown in FIG. 55(a).The original set as shown in FIG. 55(a) performs the same operation as in the multiple copy mode described above and completes the second copying operation. The top 12 originals 10 are conveyed onto the original table again via the switchbacks of paths D, E, and F of the RDF 9. The situation is shown in Figure 55 (
b) As shown in Figure 55(b), the original is A4
The paper is moved by the size and set, and the copying operation is performed in the same manner as the second copying operation described above. That is, after the member 29 attached to the moving optical system unit 45 is detected by the image tip detection sensor 30, the eraser lamp is turned on for a predetermined time T2 (width of A4 size), and the optical system scans. The potential of unnecessary parts caused by this is erased.

After time T2 has elapsed, the eraser lamp is turned off and a latent image on the second side of the document is formed on the photosensitive drum. Intermediate tray 8
The transfer material fed by the paper feed roller 37 is conveyed via the conveyance path G to the front of the registration roller 28. Further, the registration roller 28 is driven after a predetermined time T3 after the image edge detection sensor 30 is turned on, and the transfer material is sent out in the direction of the photosensitive drum 1 with accurate timing.

As a result, the leading edge of the latent image coincides with the center of the transfer paper, and a composite image is formed. Thereafter, as described above, after the transfer process, the fixing operation is performed to complete the copying.

Figure 55 explains the case where the characters "A/B" are written on the front and back of the manuscript, respectively.
Copy the letters A 11 on the first half of the transfer material, and then “
The characters "B" are copied on the latter half of the transfer material.

In this embodiment, a composite image is finally formed on the transfer material as shown in FIG. 55(C).

Fig. 56 is a timing chart for performing the maximal action of the image shown in Fig. 1-I7. When the copy start key is pressed, the RDF 9 transports the original 10 to a predetermined position on the original glass 12, turns on the main motor 4, and rotates the drum 1. After the original is set at the image reference position, the first side copying operation in the multiple copy mode is performed as described above, and then the original is ejected once by RDF (D) and transferred to the original glass 12 via switchback paths E and F. Reset the back side of the original on top. At this time, either the original is set at a predetermined time interval from the image reference position and the second side copying operation in the multiple copy mode is performed as described above, or the difference is that the original is set at a predetermined time interval from the image reference position, or the copying operation for the second side in the multiple copy mode is performed as described above.
The time is 1 hour by turning on the eraser lamp to erase unnecessary charges on the drum and prevent excess toner from adhering.
The resist 28 is activated at timing 3.

Also, at this time, the optical system performs an A3 size scan, and in the second half of the scan, the original is exposed to light to obtain a composite image.

As explained above, it is possible to add a device 17 for writing patterns such as characters with a simple structure in which a plurality of finely divided light sources are provided in one part of the erase means and a shutter mechanism is provided near the slit. did it. Further, by providing a pattern writing light source on the transport reference side of the transfer paper, characters can be written regardless of the size of the transfer paper and the copying magnification.

Also, during exposure of the original, the shutter mechanism is operated to write characters, and when the shutter mechanism is returned, a period is set in which the light source for pattern writing is fully turned on, and then the light source for pattern writing is turned off to write characters on the area where characters are written. The original image is copied to other locations. In other words, it is possible to make the area where the original is copied as wide as possible and to prevent unnecessary images from appearing at the boundary with the pattern writing area such as characters.

〔effect〕

As described above, according to the present invention, a desired pattern can be formed on a recording medium with a simple configuration when copying an original.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of a copying machine to which the present invention is applied, FIG. 2 is a block diagram of a circuit that determines process speed, FIG. 3 is a timing chart of the entire device, and FIG. Rotation timing chart, Figure 5 is potential control timing chart, Figure 6 is CCD dimming, CCD measurement timing chart, Figure 7 is scan timing chart, Figure 8 is post-rotation timing chart, Figure 9 is Fig. 1 is a perspective view showing an embodiment of a copying machine to which the present invention is applied, Fig. 9-2 is a top view of the original ItL table, Fig. 10 is a top view of the operation unit, and Fig. 11 is a top view of the copying machine to which the present invention is applied. Figure 12 is a block diagram showing the configuration of the display unit, and Figure 12 is a block diagram of the input unit.
Figure 3 is a block diagram of the drive circuit for the LED array, Figure 14 is a diagram showing how the LED array is lit, Figure 15 is a color detection circuit diagram of the developer, and Figures 16-1 to 16-3 are FIG. 16-4 is a flowchart showing an embodiment of the present invention, and FIG.
The figure is a circuit block diagram of an embodiment of the present invention, FIG. 18 is a timing chart of control pulses, and FIG. 19 is a CVRD
A diagram showing the relationship between ATA and lamp lighting voltage, Figure 20 is a diagram to explain the document detection method, Figure 21 is a diagram to explain area designation by marking, and Figures 22 to 3.
Figure 1 is a sequence flowchart for document detection and area recognition, Figure 32 is a sequence flowchart for dimming, Figure 33 is a diagram showing the relationship between the moving optical system and the photosensitive drum, and Figure 3 is a sequence flowchart for document detection and area recognition.
Figure 4 is a detailed view of the blank exposure unit, Figure 35 is a diagram to explain the slit device, Figure 36 is a diagram to explain the irradiation area on the photosensitive drum, and Figure 37 is a diagram to explain the irradiation area on the transfer paper. A diagram for explaining a state in which a pattern is formed, FIG. 38 is a diagram showing an example of a lighting pattern of an LED array, FIG. 39 is a drive timing chart of an LED array, and FIG. 40 is an example of an operation unit of a copying machine. FIG. 41 is a diagram for explaining the position and direction of pattern writing on the transfer paper, FIG. 42 is a diagram for explaining the display state of the LCD, and FIG. 43 is a diagram for explaining the pattern writing position in this embodiment. A control circuit diagram, FIG. 44 is a time chart showing a normal copying operation, FIGS. 45, 46, and 47 are time charts for explaining a pattern writing operation, and FIG.
FIG. 8 is a control flowchart for pattern writing, FIG. 49 is a time chart for pattern writing in two-color mode, FIG. 50 is a diagram showing an embodiment in which a pattern writing LED is separately provided, and FIG. 51 is blank L
ED, a layout diagram of the LED array, FIG. 52 is a diagram for explaining the irradiation area on the photosensitive drum, FIGS. 53 and 54 are timing charts for pattern writing,
FIGS. 55(a), 55(b), and 55(c) are diagrams for explaining an example of copying a double-sided original onto different portions on the same side of transfer paper, and FIG. 56 is a timing chart of the composition mode. 1 is a photosensitive drum, 3 is a fixing device, 6 and 7 are developing devices, 8 is an intermediate tray, 18 is a CCD for document detection, and 701 is an LED
Array 702 is a blank LED. jl/R2j;! j 'jZ43253o/ No. 76-7 Kasumi ((2) (b) (C) "'7: MIAlf, 427 ?3 %8 drop 7 Ku6 d/-141-?: 4/-3 躬46ba
Hy-29-p ,,=-shishiokuni figure 50 figure 5/ku %/ku yσ/ figure 520 figure 53 figure 54

Claims (1)

[Claims] In a copying apparatus having an erasing means to remove unnecessary charges on a recording medium, the erasing means is composed of a plurality of light emitting sections, and a desired pattern is formed on the recording medium using the plurality of light emitting sections. A copying device characterized in that it is configured to do so.