JPS6235377A - Copying device - Google Patents

Abstract

PURPOSE:To form a desired pattern on a recording medium by installing plural light sources on the recording medium and providing a means interrupting an original exposing light beam corresponding to an irradiation area. CONSTITUTION:An original lighting lamp 14 moves together with a moving optical system 45, and an arrow B shows a light path. Plural fine LED arrays 701a of a blank exposing unit (erasure means) 23 are disposed in an array at high density, for instance, 4dot/mm, along the spindle of a photosensitive drum 1. Thereon a selfoc lens array is disposed which image-forms the rays of light of the LED array 701 on a photosensitive body. Plural comparatively large LED arrays 702a are disposed at 2.5mm pitch along the spindle of the photosensitive drum 1. A slit device 705 is installed on the moving optical system 45.

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, this type of 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 drawback 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.

When the predetermined temperature is reached, the main motor 4
The conveyance units A, B, and C and the fixing roller 5 start rotating in the direction of the arrow. When the temperature reaches a predetermined fixing temperature, a potential control process (pre-processing) and a developing device 6.
After determining whether or not there is toner in the printer 7, the main motor 4 stops and enters a standby state to wait for a copy start signal, which is an expected state.

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 6.7, it is possible to copy onto 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 to control the input light of the potential control W (described later) and the COD for document detection (details will be described later). conduct.

Next, the original lO 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 1:1
By moving at a speed ratio of /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 CGD 1B through the document detection lens 17, and also on the projection lens 16. The image is formed on the drum via the third mirror 19 and the fourth mirror 20.

On the other hand, after the drum 1 is neutralized by a pre-exposure lamp 21, it is corona-charged (for example, 10 times charged) by a primary charger 22, and then an image irradiated by an illumination lamp 14 is exposed to slit light, and an electrostatic latent image is formed on the drum 1. is formed. 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 detecting element C according to the FL and DC components.
The reflected light on the front original glass 91 is inputted 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.
The processing will be described later.Next, after the above-mentioned COD processing is completed, a scan is performed for copying, and after obtaining an electrostatic latent image as described above, it is visualized by a designated developer 6 or 7. , manual feed 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. A member 29 attached to an illumination lamp 14 (hereinafter referred to as a moving optical system) unit configured integrally with the first scanning mirror 13 is detected by a document leading edge position (image leading edge) detection sensor 30 and then predetermined. After a time T, 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 HI image and the leading edge of the transfer paper coincide. Thereafter, as the transfer paper passes between the transfer charger 31 and the drum l,
The toner image on the drum 1 is transferred to a transfer paper, and after the transfer is completed, the toner image is separated from the drum 1 by a separation charger 32. Thereafter, the surface of the photoreceptor drum 1 is cleaned by the cleaning device 33, 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 photosensitive drum 1 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 the setting is completed, the transfer paper fed from the intermediate tray 8 by the paper feed roller 37 is transferred to the conveyance path (G
), the document is conveyed to the front of the registration rollers 28, and after a predetermined time Tl after the member 29 to which the moving optical system unit is attached is detected by the document edge position (image edge) detection sensor 30, the registration rollers 28 The latent image is driven toward the photosensitive drum l with precise 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 to transfer the toner image on the drum 1, and after the transfer is completed, it is separated from the drum 1 by the separation charger 32. 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 photosensitive drum 1 is guided to the fixing device 3 by the transport unit (A) and fixed thereon, and then passed through the paper ejection roller 8 by the flapper 34 to the sorter 39.
is discharged. The copying operation is completed by performing this operation for the set number of copies. Further, the original 10' on the original platen glass 12 is discharged onto the original tray 40 via the paper path path (D).

It is also possible to make double-sided copies from single-sided originals. In this case, the original 10 set in the RDF 9 is placed on the paper path path (H
) and set on the original glass 12, the exposure operation for the set number of sheets is performed, and the transfer paper is transferred to the intermediate tray 8 as described above.
will be stored in. When the exposure operation for the set number of sheets is completed, the original lO' is discharged onto the original tray 40 via the paper path path CD). In addition, in parallel with this original ejection operation, the next original is fed, an exposure operation is performed for the original, and a copy is made on the other side of the transfer paper that has already been copied on one side stored in the intermediate tray 8. It is discharged to a 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 RDF9, specify the multiple copy mode using the keys in the operation panel ll described later, then set the number of copies, 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. After being separated from the photoreceptor drum 1 and fixed, the multi-ff1C is transferred by a flapper 34.
iq side) The paper bus route is switched and controlled so that the paper is transported to the unit. As a result, the transfer paper passes through the conveying section (B) and is stored in the intermediate tray 8 by the switching device 41.

Repeat this operation for the set number of sheets to complete the copying operation. Next, eject the original 10' on the original platen 12 to the original tray via the RDF path (H), and then take out the next original from the RDF 9. , After setting the original on the original platen 12 as described above, in order to transfer and copy on the same side of the paper,
A photosensitive drum that transports the transfer paper fed by the paper feed roller 37 from the intermediate tray 8 to the front of the registration roller 28 through the transport path (G), and performs a copying operation in the same manner as in the case of backside copying in the double-sided copying mode. The transfer paper separated from 1 is guided to the fixing device 3 by the conveyor unit A, where it is fixed, and then discharged by the flapper 34 through the paper discharge roller 38 to the sorter. 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 snapshot mode will be explained.

After setting the original on the RDF 9, manually press the keys to perform quick copying using the operation section 11, which will be described later.

Next, set the number of copies. In this embodiment, there is a mode in which you specify the developing device to be used, and a mode in which the color of one side and the color of the second side are automatically predetermined. have. In the following explanation, the document size is A3, the magnification is 1:1, APS (automatic cassette selection) is selected, and the - side and second developer are predetermined (
The operation of the 1st side black, 2nd side red) mode will be explained. - The original copy size is set to A4 size and is 1/2 of the original A3) The original fed to the exposure position by the RDF 9 as described above is scanned by the first scanning mirror and the illumination lamp 14, and the electrostatic After the image is obtained, it is visualized by a predetermined black developing device, and the paper size sensor 42, 43, 44g attached to the upper and lower cassettes or decks is used to detect the image in the feeder in which A4 size transfer paper is set. Select paper opening 0 For example, upper cassette 2
5 is A3 size, and lower cassette 26 is A4 size.

When B4 size transfer paper is set in each deck 27, the paper is fed by a paper feed roller from the paper feed port of the lower cassette 26 in which A4 size paper is inserted.
The member that is transported to the front of the registration roller 28 and attached to the moving optical system unit is moved to the front of the image tip sensor 3o.
After a predetermined time Tl, the sensor detected by the second registration roller 28. is driven in the direction of the photosensitive drum l with accurate timing, and 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 edge detection sensor 30, the eraser lamp is turned on for a predetermined time T2 (width of A4 size), and the latent image and The second latent image is obtained by erasing the potential of unnecessary areas, and the second latent image is visualized by a predetermined red developing device (color developing device), and the A4 size is pressed. The paper is fed by a paper feed roller from the paper feed opening of the lower cassette 26, which is currently being stored, and is conveyed to the front of the registration rollers 28. Then, after a predetermined time T3, the registration rollers 28 are driven to ensure accurate timing. The latent image is sent toward the photosensitive drum 1 so that the leading edge of the latent image and the leading edge of the transfer paper coincide. Thereafter, as described above, the image is discharged through a transfer process, a fixing process via a conveyance system, and copying is completed. Furthermore, as mentioned above, the configuration is such that the combination of double-sided copying and multiple developing units, combination of double-sided copying and quick copy mode, combination of multiple copying and multiple developing units, combination of multiple copying and quick copy mode, etc. can be specified using the operation panel described later. This is what is being done. Another function is to vary the process speed (peripheral speed of the photosensitive drum 1) when there is insufficient light irradiated to the photosensitive drum 1. When the function is selected, the process speed is automatically reduced.

In addition, as an additional function, in order to erase any part of the latent image on the photosensitive drum 1, after image exposure and before development, an eraser lamp with a large number of finely divided printing elements is arranged, and the printing part The system is configured so that any latent image can be erased by controlling the light-emitting elements of the system, and functions to combine the aforementioned multiple copies and the colors of multiple developers 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, a speed signal from an encoder 82 connected to the DC motor MI4 is fed back, and the output of the PLL 81 is driven through an amplifier 83 so that the reference signal and the feedback signal are synchronized. 8
4 drives the DC motor 4, and when changing the speed, it is controlled by input signals A and B to change the output frequency of the oscillator 80.
, B are connected to a speed command circuit (not shown).

Operation timing Figure 3 shows the timing chart for the entire machine, and
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 of pre-rotation, in which pre-exposure, blank exposure, and post-exposure are ONI in synchronization with the main motor.From pre-exposure, primary, post, and transfer 1-separation charging is turned on sequentially from pre-exposure. 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 and a dark electric current is formed on the drum. The drum potential is measured using a potential sensor, and the dark potential is adjusted to approach the target potential of 450V.
Variable the current for the next charging. This is called Vo open control, and in the 0th order that is performed four times, the primary current obtained at vO
□ to control the light intensity of the illumination lamp. Turn on the lamp to create a bright potential on the drum. The drum potential is measured by a potential sensor, and the light amount of the illumination lamp is controlled so that the bright potential approaches the target potential of 50V. VL this
The bright potential is measured again using the amount of light obtained at VL1, which is called 1 control, and is performed three times.This potential is called VL2, and is used to determine the developing bias DC.

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

FIG. 6 is a timing chart for CCD dimming and CCD measurement. In CCI) dimming, the illumination lamp is controlled to a light intensity suitable for COD measurement. The scanner is located at the home position, exposes a standard white plate, measures the amount of reflected light by COD, and controls the amount of light so that the maximum value on the line is at a predetermined level.
After this control is completed, the optical system performs a full scan and
Detects the size and density position of the original. At this time, when it is detected that there is no document, 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 VL 2+70v, and the developing bias AC is also turned on. Further, 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.

Development t< Ias A C is OFF, sensor +200V
, 0FFL, post charging, transfer charging 9 separation charging is O
FF. After one rotation of the drum from the primary charging OFF, the developing bias DC becomes Ov.

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 placement 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 an image is formed by exposing a document, since a transparent electrode is used, the latent image formed on the photoreceptor is not affected. 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 non-copying device.

FIG. 10 is a main perspective view of the operating unit.

The function of each key will be explained step by step.

100aNc are each a function key,
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 copying machine that allows a desired copying mode to be set, the memory is always maintained by a backup power source.

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 copies or data, and reference numeral 112 is a reset key for returning the set mode to a predetermined standard mode.1 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, and 116 is a color key for selecting a plurality of developing devices built into the main unit.When a color developing device is selected, a built-in LED 150 lights up, including as a warning. do.

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 the original density is detected and the developing bias is corrected to obtain a copy with an appropriate density. 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. Note that pressing the key 118 increases the density (darker), pressing the key 120 lowers the density (lighter), and the density level on the display 153 changes accordingly. 152 and 153 are display groups indicating 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 when manually selecting a cassette stage.
) has the function.

155 is a display group indicating the stage selected by the cassette selection key 121 or 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-Lion 5elect
:AMS) key.

AMS has a function that automatically selects the appropriate magnification based on the detected original size and selected cassette size.
If the mode is selected, indicator 158 lights up.

125 is a zoom key, which allows the magnification to be adjusted 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, and normally has a set copying magnification of 1 and a selected cassette size.

It displays the copying mode, etc., and also functions as a message display when there is an abnormality in the device, or to display the user's operation translation, complicated operating procedures, etc.

127 is a [single-sided → double-sided] 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). ) is used to copy a double-sided original onto one side of two sheets of paper [duplex → single-sided] copy selection key, and 129 is a copy selection key that 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 the keys 127 to 130 is pressed, one of the indicators 159 to 162 lights up correspondingly.

Reference numeral 131 is a page continuous copying 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 continuous shooting 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 is 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 -in/out 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 the inner or outer border of the area in multiple copies (
This is an automatic development color 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 set areas, and in this copying apparatus, up to three areas 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 (7).

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 unit.

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 5×7 dot fluorescent display tube with 40 characters.

Data of 7 bits x 5 b7te is required to constitute one character, and 35 bits of data are sequentially read out from the character generator 203 and transferred to the shift register/latch driver 204 according to instructions from the CPU 201 (7).

At the shift register/latch fist driver 204, 5b
yte, ie, 35 bits of data are latched. After that, the shift register latch driver 205
A digit signal that determines the timing for displaying one character is driven, and one character is displayed. In this way, 1
Dynamic lighting for each character, and the duty ratio is l.
/40 (due to blanking time).

In addition, ZO8 has other LEDDMA TRI in the display section.
X, and is driven by dynamic lighting.

FIG. 12 is a block diagram of the input functions of the CPU 301 that controls the main body. The key matrix 302 is a group of switches provided for each input key, and is dynamically processed by the main body CPU 301 using well-known technology to determine 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.

306 is a coordinate input trigger signal switch provided on the pen, and in synchronization with the trigger edge of this signal, the main body CPU
301 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.

Figure 14 shows this situation. Now, if you specify the circumference of the shaded area in the figure, the LEDs indicating the X coordinate and X coordinate 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.

Projection portion 3 provided on each developer unit 311, 312
Color detection switch 313, 3 by 11-1, 312-1
Close 14. CPU301 turns ON1 the color detection switch
The color of the set developing device is determined based on the 0FF state.

That is, each developing device has its own switch pattern for each color, and as shown in the figure, if three switches are used for color detection, the configuration is such that 23-1=7 types of colors can be discriminated.d)
Ru.

Next, consider setting an area.

When the area designation key 136 in FIG.
The flashing indicates which one is currently selected, and you can also change the mode by pressing 1°° 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
m a Specify the points in the order of X coordinate, Ymin coordinate, and Ymax coordinate to complete the designation of l area. Specifically, “X/Y”, Xm1n, “X/Y”, X m a
X + “X/Y”, Ymin, “X/Y”
”, Ymax.

Input in the order of “X/Y”. Note that each coordinate is set in mm units.

After setting the value, when the "X/Y" keys are manually pressed, the 177 LEDs will light up in sequence, and the user will be able to:
You can confirm that the coordinates of each point have been entered.

Also, when inputting each coordinate, the message display will display "'Area 1: Xm1n (to)
. . ○○ o m m ” is performed in an interactive manner, 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
With the key 138, it is possible to change to the inner extraction mode.

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

In this case, place the original on the document table facing up.
．． This is the left side of the maki-no-ru junior staff, Gengo Hara, and is different from the one on the left side when actually making a copy (back on the left). In this state, the suppression pen 252 presses two diagonal points of a specified area (limited to a rectangle) on the document. At this time, press the input switch 253 while pressing it with the suppression pen,
Coordinates are input using the input switch 253 using an edge trigger at the moment of pressing or releasing, and when the input switch 253 is kept pressed, no coordinates are input even if pressed with a 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 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, a document for which an area is to be specified is set on a document table and copied using a color developer (other than black). On the copied paper, a desired area is marked with a dark frame using a marker pen or the like. The reason why one color was developed here is that in order to create a difference in color density with this Magic Ben, it is preferable to develop the color so thinly that the desired area can be seen. You can also cover it with something like this and mark it from above. Next, place the marked original (including transparent sheets, thin paper, etc.) on the original table again and press the area detection key 142. The optical system starts scanning, and the COD installed on the optical path detects Recognize marked areas on the document. Here, the area detection assumes that only one location can be recognized in one scan. Additionally, the coordinates of the recognized area are displayed on the message display so that the area can be confirmed.

Areas can be specified using the three manual 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 100a-e.

Further, the input area can be visually confirmed not only by the message display but also by the LED array 4 provided along the X-axis and the Y-axis of the document platen glass 1.

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 selecting each XY coordinate using the Y key 137, the corresponding attendance tank 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.

When the area is thus set and the inner and outer edges are set, the erase means erases the inside or outside of the area during the copying process to create a depth for obtaining the desired copy.

Further, it is also possible to designate an area by making it possible to instruct ON10FF of the LED array using the operation unit and lighting up 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-X of the image formed on the drum
Blank exposure lamp (LE
D array) is turned on (inner cutout) or turned off (outer cutout), and in the main scanning direction (Y direction), the LED array in the range corresponding to Ymin to Ymax of the image formed on the drum is turned on (inner cutout). A copy of the area is obtained by cutting out the inside or outside of the area.

FIG. 9-2 is a diagram showing the document placement 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 the document placement area, it is determined to be an area specification or magnification specification, and if the read coordinates are 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.

It goes without saying that the digitizer need not be provided on the document placement glass, but may be provided on the front side of the document cover, or may be separated from the main device.

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 to provide a density difference with the original so that the COD can correctly detect the original size. Here, the erase 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. Therefore, once it is detected that there is no document, the lighting voltage 1 determination reference level etc. are changed and pre-scanning 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 the C0D18 detects that the original is placed diagonally, a warning is displayed and the process 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, an erase 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 set the minimum cassette size that includes this calculated paper size. Due to mistakes and detection errors.

- In order to prevent the document from being interpreted as having a large circumference, the document size is made smaller (with some leeway) in the calculation process. Specifically, X,
Y both are lamm's sand, 1st 1f/↓ and 1st lot.On the other hand, the appropriate magnification is determined by the manuscript size and cassette size, but in general, changing the magnification from standard to standard (equal debt)
Therefore, if the detected document size matches or is almost equal to the standard size, it is possible to select a unique magnification between these standard sizes in preference to the accurately calculated magnification. .

In addition to the cassette size, in addition to the standard size prepared by the manufacturer, there are many cases in which special sizes are used by the user or by the person leaving the country.This copying device does not support these special sizes. AMS, APS
In order to perform this, the X and Y dimensions of these universal cassettes can also be registered. As with the area specification, there are three possible setting methods.

First, enter the asterisk (*) mode to wait for input. At this time, dimensions are displayed interactively 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.

Also, the paper size is set on the document table 251 and set using transparent electrodes, or the paper size is detected by COD scanning.

It is also possible to register. COD scanning is performed by the area detection key (142) mentioned above. 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 apparatus having an area specification function can also execute AMS or APS based on the size of the specified area and the cassette size or magnification, rather than the original 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 1 magnification setting mode using the asterisk (*) mode and specifying 2 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→--1%° It is also possible to determine the magnification ratio by similarly substituting binary values using the numeric keypad. With these two magnification determination methods, the calculated magnification may exceed the possible magnification of the copying apparatus. With this copying device, 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 magnification can be specified at the same time as shown below. It is configured to obtain.

000% 1st: ○○○%, 2nd: ○○O%” After making the first copy, place the scaled image on the document table, input the displayed magnification, and copy again to obtain the desired image. A copy of the magnification of is obtained.

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.

It is also possible to determine the copying magnification by combining the digitizer j1 and the CCD detection. 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 document using a light pen or numeric keypad.
For example, the coordinates corresponding to the desired copy size are input (step 2).The input of the coordinates is specified by specifying a point diagonal to the origin on the platen glass. Also, when inputting with the numeric keypad, only the X or Y coordinates are required, 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 magnification that was calculated to check whether it can be copied in batches (step 5), check whether the value is within the range that allows scaling (step 6), and if it is within the range. The first and second copying magnifications are displayed using the calculated 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 account.

Next, we will explain the control of copying operations, focusing on functions such as continuous page copying, multiple copying, and area specification (see Figure 16-2).
This will be explained using the flowchart shown in FIG. 16-3. 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 copy routine shown in FIG. 16-3 will now be explained. First, the copying magnification and copying density are determined, and the lens position, developing bias, etc. are adjusted (step 30.31).
Then, it is determined whether the color selection mode is set, that is, color copying mode (step 32), and if it is not the color mode, the black developer is selected (step 33), and if the color mode is selected, the color developer is selected. Select (step 34), and determine whether there is an area specification (step 35). If there is an area specification, it is determined whether it is based on a cassette when changing the magnification (step 36), and it must be a cassette 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 3).
'7), Therefore, when cutting inside or outside an area, all you have to do is turn on the blanking LED corresponding to this new area, and check which mode the in/out key is in. In other words, it is necessary to judge whether the area is internally or externally removed (step 3B).
If in mode, set a flag to control the blank exposure lamp and erase the outside of the area (step 39);
If it is the 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 quick copying (step 41). If page continuous copying is being performed, A copy (original copy) will be used to determine the scan width. It is determined whether or not to copy the left half of the document placed on the stand (step 42).

Set a flag to scan the left half of the original (step 43), set a flag to perform B scan (scan the right half of the original) if it is not an A copy (step 44), and set a flag to scan the right half of the original (step 44). Otherwise, scan according to the size of the original, then expose, develop, and transfer according to the conditions determined above.

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 automatic color and area conversion/7-I-w't-de-coupling-h)
25 To Rolo, key 140 for automatic conversion of inner and outer areas in the first and second copies, automatic conversion of one color.
or step 16) to determine whether or not 41 is pressed.
If it is in automatic conversion mode, color and area outline,
Convert the outside cut (step 17).

Then, it is determined whether or not it is in the page quick copy mode (step 18), and if it is not the page quick copy mode, 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 continuous copying mode will be explained. Place two originals (A4 size or smaller) on the original table and press the page continuous 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. The developer is then automatically replaced to change the color, and the next 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. The sheet of paper is sent to the drum at the timing when the leading edge of the latent image on the first sheet of paper 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.

It is also possible to specify an area and copy when performing single-sided or multiple copying.

Further, color conversion is possible even when not in page continuous shooting mode, and in 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 CCD image sensor, 401 is an A/D converter, and 402 is a CC
D drive pulse generation 1: circuit 6 403 is a copy start signal from an external circuit, 404 is a document/area mode switching signal from an external circuit, and 405 is a home position signal from an optical system home position sensor 15. position·
A signal 406 is an image tip signal from the image tip sensor 30,
407 is a shift pulse signal of the CCD image sensor 18, 408 is a reference clock signal φ, 409 is a transfer lock signal φl of the COD image φ sensor 18, 410 is a transfer lock signal φ2, and 411 is a transfer lock signal φ2 of the CCD image sensor 18. reset pulse RS, 412 is CC
D image sensor 18 output signal CCD OU, T
, 413 is the clock signal A of the A/D converter 401
/DCLK, 414 is a digital signal DATA after A/D conversion of the output of the CCD image sensor 18. 1
4 is a lamp for document illumination; 415 is a lamp dimming circuit;
16 is a lamp on/off signal, and 417 is dimming data.

The dimming circuit 4i5 is configured to apply a voltage proportionally corresponding to the value of the dimming data 417 to the lamp 14.

To explain the operation inside the cylinder, first, the 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 a reference clock signal φ408 and an A/D converter clock signal A/DCLK413 to the pulse generator 402 and A/D converter 401, respectively.

From the reference clock signal φΦ408, the COD drive pulse generation circuit 402 generates transfer locks φ1·409 and φ2·410, and a reset pulse R5411. The output signal CCD of the COD image sensor 18 is driven by these clock pulses.
0UT412 is A/D converter 401.
The digital output DATA 414 is read from the input port of the micro-computer 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 CCD image sensor 18 is required, the dimming circuit 415 turns on the lamp 14 in response to a lamp on/off signal 416. Microcomputer 400 is CC
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 shift pulse s h420, transfer lock φ1.421. φ2・422, reset pulse RS, 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 427, 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 CCD image sensor
407.431 is the output signal C of the CCD image fuzzy sensor
CD0UT412.432 is threshold a level, 91
93 is a standard white board, 93 is an original storage reference position, 15 is an optical system home position sensor, 30 is an image tip sensor, 12 is an original table, 435 is an original document, and 436 is an output of a COD image Φ sensor by a microcomputer 400. This is the position for processing.

As shown in the figure, a computer 4 processes all the output data of the CCD image sensor in each line.
This is because the processing speed of 00 may be slow. Shifting the processing position every line is a means to prevent the detection accuracy from deteriorating as much 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, 433 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 copying operation in dummy copy mode, and make a thin dummy copy 4 with colored toner such as red.
Get 22.

For this gummy〇 copy 422, select the area you want to specify by 4
Place a 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, set the marked area 441 on the document table, By specifying the inside and outside of the file and copying it, copies like 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. The entire control program is set up so that this program is executed when the need for document detection or area recognition arises during the flow of the copying 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 1. In step 2, first, various counters (clock counter, line counter) on RAM are
In order to generate various pulses to drive the COD image sensor in the zero-order step 3 where initialization is performed, the reference clock φ408 and the clock pulse A/DCLK413 of the A/D converter are output. Microcomputer 400 built-in timer function (with interrupt function) for clock pulses
Next, in step 4, wait for the optical system home position signal 405, and if the signal is detected, proceed to step 5, and wait for the image tip signal 406. If the zero image destination signal 406 is detected, In step 6, interrupts are 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 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. 18. When an interrupt occurs, the process enters the main flow from step 9, and 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 incremented.

Then, in step 10, it is determined from the value of the clock counter whether it is the timing to output the shift e pulse 407, and 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 from the interrupt program. If not, proceed to step 13 and check whether it is the data read position (timing) or not by checking the sample point value and clock.
Judgment is made by comparing the counter values (whether they match or not). If the value of the sample point and the value of the clock counter are different, jump to step 21 and extract from the interrupt program; if they match, it is determined that it is the read position,
Proceeding to step 14, the mode is determined based on the document/area signal 404. If in area detection mode, step 2
3, jump to the area detection mode routine. If it is in the document detection mode, the process advances to step 15 and the A/D conversion value of the COD image sensor output is compared with the set threshold level value to detect the document indicated by the current line counter and clock counter values. stand 12
Determine whether there is a document at the position above. If there is no document, the process jumps to step 18, and if there is a document, the process goes to step 16. In step 16, the clock counter value Xmaxl is stored in the buffer. This value is updated every time there is a document in one line, and eventually, the clock-counter value at the time of the data for which it was finally determined that there was a document in the data of that line will be updated for each line. Everything will be memorized line by line.

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

Next, in step 18, the A/D converted value of the CCD image sensor output is stored in a buffer for one line. In step 19, it is determined based on the value of the clock conflict counter whether data processing for one line 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. If the interrupt program has been completed, in step 24, it is determined that there is a document from the first data that is determined to be a document among the A/D conversion values of the COD image sensor output for one life. AE data counters corresponding to the maximum and minimum values of the data up to the last data are counted up. However, when an area for AE data collection is set, the AE data counter is counted up only within that area.

The AE data counter is prepared for the maximum value, minimum value, and all values for each line, and serves as data for performing AE.0 Next, in step 25, Xmaxl is The value 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 step in FIG. 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 next.

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. Step 29゜Step 30. From step 31, step 41 of this figure. Step 45. Step 49
．． Step 54. Jump to step 58.

When the process jumps to step 41, the converted value in step 42 is compared with the set threshold level value, and it is determined that the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. judge whether If there is no original, jump to step 44 and proceed to step 4 in Figure 24.
Jump to 0. If there is a document, the flag is flagged in step 43 as the second step, and the flag is changed from step 44 to step 4 in FIG. 24.
Jump to 0.

Jumping to step 45, in step 46 C
The A/D conversion value of the OD image number sensor output is compared with the set threshold level value to determine whether it is the level of black grain. If the level is not black, the process jumps from step 48 to step 40 in FIG. 24. If the level is black, 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 then jump to step 40 in Figure 24. If there is a manuscript, proceed to step 50 and enter Xm1n, Xmax, Ym
in.

Ymax value, current line counter, clock
The value of the counter is compared and updated. Next, in step 52, the flag is set to the fourth stage, and the process jumps from step 53 to step 40 in FIG.

When the process jumps to step 54, it is similarly determined in step 55 whether it is the level of the black speck, and if it is not the level of the black speck, the process jumps from step 57 to step 40 in FIG. 24, and if it is the black speck level, the flag is set to After setting the level to 5, 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
Jump to Step 40 in Figure 24. If there is a manuscript, go to Step 60.
Compare Ymin and Ymax with the current line counter and clock counter values and update them. 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 (407).

As shown in step 22, the process jumps to step 33 in the figure. Then, in step 64, a shift pulse 407 is outputted at the timing shown in FIG. In step 65, the 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,
If completed, proceed to step 67 and shift pulse 4
07 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 has not been completed, step The process proceeds to step 70, where the values of the sample point and one line end are set, and the counters, etc. are initialized in step 7e, 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 when the need for document detection or area recognition arises during the flow of the copying sequence, this flowchart will be explained according to Figure 0. 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, the CCD image reference clock φ408, the A/D Converter clock pulse A/D CLK413 is output. In this embodiment, both clock pulses are oscillated by the built-in timer function (with interrupt function) of the micro φ computer 406. Next, in step 4, the optical system Wait for the home meeting position signal 405, and if the signal is detected, proceed to step 5 and wait for the image head signal 406 this time 0 image head signal 4
If 05 is detected, the interrupt is enabled in step 6. Then, in step 7, wait until the document or area detection completion flag is set. When it is set, in step 8, the COD output data on the page memory is sequentially read, and in step 9, the area A (
If so, the AE data counter corresponding to the data in area A is counted up in step 10, and if not in area A, in step 13, in area B (see FIG. ), count up the data L, 10th AE data, 11 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 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 is entered from step 14. In step 15, the clock φ counts the number of output data outputted in time series from the COD image sensor for each column.
Count up the counter.

Then, in step 16, it is determined whether it is the timing to output the shift pulse 407 based on the value of the clock counter, and if the timing is right, the process jumps to the sh line as shown in step 27. If not, step 17 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 obtained. By comparison, it is detected whether or not there is a document at the position on the document table 12 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 goes to step 21. In step 21, the clock counter value is stored in the buffer as Xmaxl. This value is updated every time there is a document in one line, and most importantly, the value of the clock counter at the time of the data for which it was determined that there was a document last among the data in that line is updated for each line. Everything will be memorized line by line.

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
i n, and the maximum and minimum values of the line counter values,
Ymax, Ymin and current clock φ counter,
Compare line counter values and update if necessary.

Next, in step 23, the A/D converted value of the CCD image sensor output is stored in a buffer for one page. In step 24, it is determined based on the value of the clock conflict counter whether the data processing for one life has been completed. If it has not been completed, the sample point is updated in step 25, and then the interrupt program is exited through step 26. If the output has been completed, in step 29, the last data of the A/D conversion values of the COD image sensor output for 1 line, which is determined as having a document, is
The value of xl is stored in a RAM specific to this line so that it will not be updated in the next line processing. Then, from step 26, the interrupt program is extracted.

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 figure, and if it is the first stage, the process jumps to the 5EQI routine as shown in step 39, and similarly steps 32 and 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 based on the value of the clock counter whether data processing for l life has been completed,
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 shows a part of the interrupt routine of the document detection and desired 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
Compares the A/D conversion value of the OD image sensor output with the set threshold level tyy4mft to determine whether the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. do. If there is no original, jump to step 48 and proceed to step 4 in Figure 29.
Jump to Step 4. If there is a manuscript, go to Step 47 and set the flag to the second stage from Step 48 to Step 44 in Figure 29.
Jump to

When it jumps to step 49, step 50 smells and C
The A/D conversion value of the CD image φ sensor output is compared with the set threshold level value, and it is determined whether it is the level of the ring defect. If it is not at the black level, the process jumps from step 52 to step 44 in FIG. 29, and if it is at the ring 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 Xm1n, Xmax, Ym
in.

Ymax value, current line counter, clock
The flag is set to the fourth stage in the zero-order stage 56 for comparing and updating the counter values, 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 it is the level of the ring-waku, and if it is not the level of the ring-waku, the process jumps from step 61 to step 44 in FIG. 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 there is a document or not, and if there is no document, the process jumps to step 66 and then to step 44 in FIG. 29. If there is a manuscript, Xm1n is sent in step 64.

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 in step 6Gly, 9QI V 1 ÷ Tsuza Ad is set - ζ; be. If it is determined in step 16 of FIG. 28 that it is time to issue the shift pulse 407, the process jumps to step 67 of the figure as shown in step 27. Then, in step 68, a shift pulse 407 is outputted at the timing shown in FIG. In step 69, the line number counter is counted up, and 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 advances to step 74 and the shifting pulse is hi the output of 407
gh, interrupts are disabled in step 72, AE data is created in step 73, and the interrupt program is extracted in step 76.

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

FIG. 32 is a flowchart of the dimming program. When the sequence requires dimming for the COD image fist sensor, a program according to a 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 COD image sensor is driven.In step 4, from DATA414 of the A/D conversion value of the output of the COD image O sensor,
<--Determine whether flow is occurring. 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, Proceeding to step 6, the dimming data is counted up.Next, in step 7, an overflow check is performed, 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 (erase 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 l at the order of ot/mm.
), and a SELFOC lens array (not shown) is arranged 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 1 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
70B is the slit device 705 and the continuous material 703
The connecting member 703 is a spring connected to the rod 707.
is connected to solenoid 706. When the solenoid 706 is energized, the connecting member 703 moves along the broken line 7 in the figure.
Move to position 03', connect part of slit 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, due to the force of the spring 708.

The continuous member 703 returns to the position indicated by the solid line in the figure, and no longer blocks exposure of the original.

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

730 is the area illuminated by the LED array, 731 is the area illuminated by the blank LED, 732 is the document exposure irradiation area when the solenoid 706 is not energized, and 733 is the document when the solenoid 706 is energized. This is the exposure irradiation area. The areas 730 and 731 and the areas 730 and 733 overlap to some extent. Also, the side marked with a mark in the diagram is the transfer paper feeding reference side.
Regardless of the paper size, the paper is conveyed with the paper edge aligned here. Therefore, by arranging the LED array 701 on the reference side of the transfer paper, it is possible to arbitrarily write characters, etc., regardless of the size of the transfer paper and the 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. In addition, if the current is not applied to the lensoid 706 and the LED array 701 and blank LED 702 are all turned off during exposure of the original, then 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. Furthermore, 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. I can do it. 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 the lighting pattern of the LED array 701. In FIG. 38, 8×8 dots are shown for ease of explanation. In the 0 figure, 1 indicates the lighting state of the fine LED, and O indicates the non-lighting state. 1 to 8 in the figure 0 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, 12'' can be rotated and written at various angles.

An operating unit for actually causing the LED array 701 to execute a write operation on the m 40 Z is illustrated.

Incidentally, this operation section may be provided in the operation section shown in Fig. 1O, 7.
50-755 LED display element, 756 is dot matrix LCD (liquid crystal display), 7
57 to 764 are key switches; key 757 in the figure;
758.

Reference numeral 759 is a mode designation key for selecting what to write. When key 757 is pressed, LED 7850 lights up and it becomes 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 for setting 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 characters on the transfer paper. Each time the button is pressed, the states 41-1 to 41-6 are rotated. With this, by changing the direction in which the document is placed, characters can be written on the desired edge.When the key 762 is pressed, the LED 753 lights up and the written characters become negative.

For example, if the light emitting pattern "l"0" in FIG. 38 is reversed, "2" will be written in white on a black background. Key 76
3 is pressed when changing the color of the characters to be written and the color of the document portion. When the key 763 is pressed, the LED 754 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 Figure 6 in Figure 42.
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, and 771 is a CPU.
LCD driver connected to 771, 756 is the aforementioned LC
It is D.

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 has a clock part. 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 706 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. When the copy starts, the drum starts rotating and the blank LED 702. L
ED array 701 lights up. Lamp 14 after the end of the previous rotation
lights up, and the optical system 45 starts moving forward. After a time Tl corresponding to the distance between the optical axis and the blank unit from the image tip signal output from the sensor 30, the blank LED 702, L
When the ED 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 702 is turned off.
, lights up 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, one cycle ends.

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

Figure 45 shows the time chart. The shaded area in Figure 0 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. 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 turns off and the LED array 701 turns off. Selective lighting begins synchronously, forming a character latent image. At time A when one predetermined character has been formed, the LED array 701 is fully lit and the solenoid 706 is turned off. 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 reaches the inverted position, the lamp 14 is turned off, and the blank LED 702 is turned off.
The LED array 701 is fully lit. 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 7
01 lights up and performs forward rotation, lamp 14 after completion of forward rotation
lights up and the optical system advances.T1 hours after the 0-picture ahead signal, the blank LED 702 and the LED array 701 go out. Then, after a time period of T3=((transfer paper size - character length)/process speed~T2), the solenoid 70
6 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 written on the front or rear of the transfer paper. Furthermore, by changing the writing timing of characters, it is also possible to write characters in the middle of the transfer paper.

A timing chart in this case is shown in FIG. 47. When copying starts, the blank LED 702 and the LED array 701 light up. After reading the previous rotation, the lamp 14 lights up and the optical system starts moving forward. After a time T1 has elapsed from the 0-pixel ahead signal, the blank LED 702. The LED array 701 turns off, and a latent image begins to be formed over the entire surface of the document. After 9 hours have elapsed corresponding to the write position, 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 forming a predetermined character latent image, the solenoid 706 is turned off and the LED array 701 is turned on. Then, after time T2 has elapsed, the LED array 701 is turned off, and when the document reaches the 0 reversal position where document exposure starts again at the edge, the lamp 14 is turned off and the blank LED 702, L
The ED array 701 is fully lit. One cycle ends when the optical system returns to its 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 addition, in the case of serial number mode, when copying a predetermined number of sheets for one original, the serial number is incremented for each copy, and "1" is added when copying the next original starts.
”. Therefore, for a copy of one original,
It will automatically number consecutive numbers. Also, the first manuscript...
Continuous numbers can be automatically written sequentially from 1 to copies as well. 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. The PAGE register is a register for storing page numbers.

Further, this register is set to "l" at the initial time and when the page mode is newly switched. First, the operation in date mode will be explained. In step 800, it is determined whether the mode is date mode or not, and since YES is determined here, the date is set in the write register in step 801. In step 805, it is determined whether one cycle has ended or not, and the loop of step 805 is repeated until YES. When one cycle is completed, the process proceeds to step 806, and it is determined whether or not the serial number mode is set. In this case, since the answer is No, the process proceeds to step 80B. In step 808, it is determined whether the set number of sheets has been completed, and if the answer is no, steps 805 to 806...
Repeat the loop of 808.

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.

No is determined in step 800, and Y is determined in step 802.
Since it is determined as S, the process proceeds to step 803, where the contents of the PAGE register are set in the write register.0For example, if the write register is immediately changed to page mode, "1" is set in the write register. Then, the loop of step 805 is repeated until one cycle is completed in the same way as described above.
After completing one cycle, the process moves to steps 806 to 808, and it is determined whether or not the set number of sheets has been completed. Step 805 - Step 806 - Step 8 until the set number of sheets is completed
Repeat the loop of 08, step 80 after the set number of sheets
Proceeding to 9, it is determined whether or not the page mode is set.

In this case, the answer is YES, so the contents of the PAGE register are set to “l”.
is added, the value of the PAGE register is incremented, and the post-processing ends.

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 "1"), and when the next copy command is input, steps 800 to 802 Proceed to step 803, and the number added by “1” from the previous time (“2” in this case)
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 "1" is written to the write register.
" is set. After completing one cycle, it is determined in step 806 whether or not it is the serial number mode. Since the answer is YES here, the process advances to step 807, and the contents of the write register are set to "1".
" is added to become "2". The loop of steps 808 - 805 - 806 - 807 is repeated until the set number of sheets is completed, and the number written on the transfer paper is incremented every cycle. When copying for the number of sheets is completed, the process moves to steps 809 to END and ends. Therefore, in the case of serial number mode, numbers are written sequentially starting from l for the set number of sheets of the same original. Similarly, numbers are written sequentially starting from 1 for the first copy.

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, and blank L
ED 702 and LED array 701 are turned on. After completing the previous rotation, leave the blank LED 702 fully lit, and turn on the LED
The array 701 is sequentially and selectively turned on to form a latent image of a pattern such as a character for a 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, and the lamp 14 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. Optical system 45
starts and the lamp 14 lights up. Blank L at this time
ED702, the LED array 701 becomes blank after T1 time elapses from the output of the 0-pixel signal that is turned on.
is turned off, and after the time T4 during which the next character was written has elapsed, the LED array 701 is turned off. When the optical system reaches the inverted position, the lamp 14 turns off and the blank LED 702
．． 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 write mode for a long time, it becomes impossible to obtain a proper image.

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

Figure 50 is a drawing of the vicinity of the drum, where 1 is the drum.

980 is a blank LED for erasing black, and 981 is an LED array for writing. Figure 51 shows the black eraser blank LE.
0980 and a writing LED array 981. In this example, LEDs 99 are arranged at a pitch of 2.5 mm.
0 is lined up.

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

Blank LED for blackening 980 is in the range of 991,
In other words, the entire surface of the drum can be irradiated. On the other hand, LED array 981
can only irradiate 992 areas 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.

When the copy starts, the blank LED 980 lights up and the 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 passed since the image tip signal, blank LE0980
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 LE0980 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. When the pre-rotation is completed, a part of the blank LED 980 goes out and the time T
5, 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, I, and ED array 981 are all lit. After 16 hours, LE
All D arrays 981 are turned off. The registration roller is turned on at a predetermined timing, and characters are formed on the leading edge of the transfer paper. When the transfer paper reaches the intermediate tray, the first 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 pre-rotation is completed, the lamp 14 lights up and the optical system 45
is blank L after time T1 has elapsed from 0 pixels ahead, where forward movement starts.
ED980 turns off except for a part.

TB = T7 + After T5 time, blank LED98
0 turns off all lights. 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 LE0 is turned off.
Turn on 980. After that, the optical system returns to the home position and one cycle is completed.

Furthermore, in the above embodiments, the pattern writing LED was provided only in a part of the image area.

Of course, they may be arranged across 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.

RD F9. After setting the original on the machine, press a predetermined key on the operation unit 11 to separate (do not overlap) two images of the double-sided original onto the same side of one transfer material from the double-sided original and form images. Set the mode. 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(L).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 upper 12 originals 10t-RDF9 are conveyed onto the original table again via the switchbacks of paths D, E, and F. The situation is shown in Fig. 55(b).As shown in Fig. 55(b), the original is
Move it 4 sizes and set it, then copy 2 of the page snapshot mentioned above.
After the copying operation is performed for the second time, that is, after the member 2.9 attached to the moving optical system unit 45 is detected by the image edge detection sensor 30, a predetermined time T2 (A4 size width ) The eraser lamp is turned on to erase the potential of unnecessary parts caused by the scanning of the optical system.

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 one 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 sides of the original. First, the characters "Ao" are copied on the first half of the transfer material, and then "B" is written on the front and back sides of the original. ” is 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 above-described image compositing operation. 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 set the original at a predetermined time interval from the image reference position and copy the second side in the multiple copy mode as described above, or, as a different matter, use the eraser lamp for 12 hours after the image tip signal is generated by the eraser lamp. The lamp is turned on to erase unnecessary charges on the drum and prevent excess toner from adhering, and at the same time, the resist 28 is activated at time T3.

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.

1 - As explained above, one character can be printed using a simple configuration in which a plurality of finely divided light sources are provided separately from the erase L stage for blackening, and a shutter is provided to cut the image exposure light to the irradiation area of the light source. You can add 8 parts of the pattern. Furthermore, by providing a light source for pattern writing separately from the erase f stage, it is possible to prevent problems such as unnecessary charge remaining due to long-term use of the J) writing mode.

Furthermore, by providing a light source for pattern writing on the transfer paper feeding reference side, it is possible to write characters, etc., regardless of the transfer paper size and copying magnification. In addition, by turning on and off one shutter means during exposure of the original, and turning on all the light sources for pattern writing at the timing of switching, unnecessary images are not generated at the cut edge of the text area and the original copy area. The original copy section can be made as large as possible.

〔effect〕

As described above, according to the present invention, the pattern 9 can be formed on a recording medium using the in-tube structure when copying an original.

[Brief explanation of drawings]

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, CCDJ.
7 is a timing chart for scanning, FIG. 8 is a timing chart for post-rotation, and FIG. 9-1 is a perspective view showing an embodiment of a copying machine to which the present invention is applied. Figure 2 is an upper diagram of the document table, Figure 10 is an upper diagram of the operating unit, Figure 11 is a block diagram showing the configuration of the display unit, Figure 12 is a block diagram of the input 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 for explaining the slit device, and Figure 36 is the photosensitive drum L.
FIG. 37 is a diagram for explaining the state in which patterns such as letters are formed on transfer paper. FIG. 38 is a diagram showing an example of the lighting pattern of the LED array. 40 is a diagram showing an example of the operating section of the copying machine. FIG. 41 is a diagram for explaining the position and direction of writing a pattern on transfer paper. FIG. 42 is a diagram for explaining the display state of the LCD.
3 is a control circuit diagram for pattern writing in this embodiment, FIG. 44 is a time chart showing normal copying operation, and FIGS. 45, 46, and 47 are time charts for explaining pattern writing operation. , FIG. 48 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 a blank LED, an LED
FIG. 52 is a diagram for explaining the irradiation area on the photosensitive drum; FIGS. 53 and 54 are timing charts for pattern writing; FIG.
), (b), and (c) are diagrams for explaining an example of copying a double-sided original onto different parts of the same side of transfer paper, No. 56.
The figure is a timing chart of the synthesis 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. AE3 11N song finale
Jōbashi-keO copy key〃 )ot ノ02ia6 ん0/Figure 76-7 ((2) (b) a 7 6 ku% d14 4/-?: 4/-3 4 shi matata 50 5th / % / ^ yσ / 53rd figure 540

Claims (1)

[Claims] In a copying apparatus that exposes an original to light to form a copy image on a recording medium, a plurality of light sources are provided to form a desired pattern on the recording medium, and the area of irradiation of the recording medium by the plurality of light sources is adjusted. What is claimed is: 1. A copying apparatus comprising means for blocking original exposure light.