JPS643265B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a copying machine, a facsimile machine, etc.
The present invention relates to a recording device that reproduces original images on a recording medium at that location or at a remote location.

Many of these types of recording devices are generally easy to operate so that anyone can use them, and are often placed in various locations. Therefore, its use has been increasing recently. As a result, the number of copies and the number of facsimile transmissions increases, and confidential documents to a greater or lesser extent are easily leaked by people who do not particularly need the materials or by people outside the control area. There is an increasing risk of information leakage, such as information being leaked to In order to reduce such risks, it has been proposed to use special paper for manuscript paper and recording paper (for example,
39854), but according to this, there is another disadvantage that even those who have the authority to manage and dispose of the documents cannot make copies.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording device that can make a highly confidential copy and further copy the copy in the form of an original document image.

In order to achieve the above object, in the present invention,
In a recording device that forms an image on a recording medium: a first image reading unit that reads an image on a document pixel by pixel; and a first image reading unit that reads an image on a document pixel by pixel and determines the image information distribution on the document. a first image pattern changing means for changing to a predetermined pattern or code different from the first image pattern changing means; and a first image forming an image on a first recording medium based on the information changed by the first image pattern changing means. a first recording means for recording an image different from the image on the document onto the first recording medium; a second image reading means for reading the image on the first recording medium pixel by pixel; means, and a second image reading means for changing the information read by the second image reading means to the image information distribution on the document.
a second image forming method for forming an image on a second recording medium based on the information changed by the second image pattern changing means; a second recording means for changing the image of the document into the original image and recording it on a second recording medium; and a selection means for selecting between the first recording means and the second recording means.

For example, changing the pixel-by-pixel image information read by the first image reading means to a predetermined pattern or code that is different from the image information distribution on the document can be done by:
This can be done by predetermined rearrangement of the image information using a combination of buffer memory, counters and logic gate elements, or by a microcomputer, or by encoding using a coding compressor used in facsimile communications. The reverse change, that is, the change of the information read by the second image reading means to the image information distribution on the original document, can be similarly performed by rearranging the pixel information (rearranging it to the original position). Alternatively, it may be performed using an expander for reproducing pixel information used in facsimile communication.

FIG. 1 shows the configuration of one copying apparatus implementing the present invention. In the copying apparatus shown in FIG. 1, in the copy mode, the light reflected from the original IP by the illumination lamp HLA radiation is directed onto the drum 1 by the first mirror FMI, the second mirror SMI, the in-mirror lens IMI, and the third mirror TMI. is guided to the surface of the photoreceptor. On the other hand, the photoreceptor is uniformly charged by the main charger 2 and is exposed to the guided light to form an electrostatic latent image. This electrostatic latent image is made visible by depositing charged toner supplied by the developing device 4. On the other hand, the copy paper is taken out from the cassette CAS1 or CAS2 by the paper feed roller PSR1 or PSR2. The removed copy paper is located at the latent image position (edge of the original)
By rotating the registration rollers 6 in synchronization with the image data, the image is sent to the transfer section. In the transfer section, the toner attached to the latent image area is transferred onto the copy paper by the transfer charger 7, the copy paper is separated from the drum 1 by the separation roller 8, and the toner is brought into close contact (fixed) onto the copy paper by the fixing heater HEP. )
The copy paper is sent to the output tray COT.
On the other hand, the toner remaining on the drum 1 is neutralized by a static eliminating charger 5 and collected by a cleaning roller 10. 11 is a cleaning blade.

The document reading scanning system includes illumination light HLA, mirror FMI,
It consists of an SMI and a carriage that moves them in the direction of the solid arrow without changing the optical path length.

The copying apparatus shown in FIG. 1 further includes an OFT (optical fiber tube) 3, a half mirror 14, a lens 15, and a CCD element 16, and an image reading system consisting of the half mirror 14, lens 15, and CCD element 16. Read the image of the original IP with the device (facsimile transmission mode),
The OFT 3 projects a light source on the drum 3 according to the video signal (facsimile reception mode), or the original reading scanning system projects an optical image of the original IP onto the drum 1, and the image signal read by the image reading device is processed and given to OFT 3 for redundant projection onto drum 1 (corrected copy mode). The operation of each part in the copy mode, facsimile transmission mode, facsimile reception mode, and corrected copy mode is controlled by the electrical equipment section 1.
It will be held at 7. Note that 13 is a board, 12 is an OFT holder that moves forward and backward with respect to the drum 1 on the board 13, KB is a keyboard, and PR is a printer.

Figure 2 shows an enlarged plan view of the keyboard KB.
This keyboard KB is equipped with a power switch 18, mode designation switches ₁₉₁ to ₁₉₃ , a write designation switch ₁₉₄ , a numeric keypad 20, a secret copy designation switch ₁₉₅ , and a print switch 21. Indicator lights 22 ₁ , 22 ₂ to indicate the position of the selection lever, an indicator light 23 to indicate an error, and a display panel 2 to display the set number of continuous copies.
4 ₁ , a display panel 24 ₂ for displaying the actual number of copies, an indicator light 25 ₁ for prompting code input, an indicator light 25 ₂ for prompting input for the number of copies, an indicator light 26 ₁ that is lit when the mode designation switch 19 ₁ is closed. , an indicator light 26 ₂ that lights up when the mode designation switch 19 ₂ is closed, an indicator light 26 ₃ that lights up when the mode designation switch 19 ₃ is closed, an indicator light 26 ₄ that lights up when recording a facsimile reception, and a printout. Indicator light 28a that is lit when the switch 21 is closed, indicator light 2 that is lit when the write switch ₁₉₄ is closed
_6.5 An indicator light 28b and a buzzer 27 indicating secret manuscript copying are installed.

Each upper element of the keyboard KB is connected to an electronic control unit 30 of the electrical equipment section 17, as shown in FIG. The electronic control unit 30 includes a first central processing unit (or microprocessor, e.g. Intel's 8040; hereinafter abbreviated as CPD1) 32,
2nd with ROM, RAM and input/output ports
central processing unit (or microprocessor,
For example, Texas Instruments
TMS1000; hereinafter abbreviated as CPU2. ) 33, a read-only memory (for example, Intel's 8755; hereinafter referred to as ROM) 34, which has an input/output port; an integrated semiconductor chip with a non-volatile control circuit (hereinafter referred to as non-volatile control IC) 35;
It is comprised of a nonvolatile read/write memory (for example, Toshiba's 142C; hereinafter referred to as nonvolatile RAM) 36 which is read/write controlled as nonvolatile information by the nonvolatile control IC 35, and a clock pulse oscillator 37.

The ROM 34 contains power-on sequence program data for turning on the power to each part of the copying machine in response to the closing operation of the power switch 18, and a power supply for turning on the power to each part of the copying machine in response to a call detection signal from the facsimile reception processing circuit. Input sequence program data, copy operation program data, modified copy program data, facsimile transmission (image reading) program data, facsimile reception (image recording) program data, timing data referenced in performing each of the above operations, and constant setting for each part In addition to the data stored in the fixed memory in advance, write program data is written to the nonvolatile RAM 36 when the write switch ₁₉₄ is closed, and data is written to the input/output port 31 when the write switch ₁₉₄ is open. The code reading program data reads the memory data at the read address of the non-volatile RAM represented by the code given to the code, and when the secret manuscript copy designation switch ₁₉₅ is closed and the next input code is a specific type (99), it is unexpected. Another type of image copy and specific (97)
Modified copying program data that makes a meaningful image copy when , a code on the document is read and the code, a human code, a code representing the month, date and time, and a code representing the number of copies, program data to be written to the RAM 36, and the printer. In response to pressing the PR printer key PRK, the data written in the RAM 36 is read out and the printer is printed.
The read printer out program data given to the printer is stored in fixed memory.

The first CPU 1 32 reads each program data from the ROM 34 and temporarily stores it in the RAM, and according to the program, input/output port 3
1, 2nd CPU2 33, ROM34, RAM3
5, nonvolatile RAM 36, etc., and command data such as port selection, write designation, read designation, etc. are given.

The second CPU 2 33 is used as an electronic clock in this example, and based on the clock pulses of the clock pulse oscillator connected to it, the
Counts the day and time, CPU1 or ROM34
month in response to a read command from the input/output port of
This is an operation setting (internal ROM program) in which codes representing the day and time are given to the RAM 36 and written.

The upper part of the key of the write switch ₁₉₄ is normally covered with a cover 29 so that it is not operated, as shown in FIG.
This cover 29 can be locked if necessary. When this cover 29 is removed and the write switch ₁₉₄ is closed, the write program data is read from the ROM 34 and stored in the internal RAM of the first CPU 132, and the electronic control unit 30 is converted into a non-volatile memory based on the write program data. Write control to the physical RAM 36 is performed. This write operation flow is explained in the fifth section.
The steps shown in FIG. 5A are shown in _detail with reference to FIG. ON of switch 19 ₄ is detected, and the write program data is read from ROM 34 and CPU 1
32 internal RAM (step),
In accordance with this write program data, the indicator light 25 ₁ is first turned on. Then, when the operator presses, for example, the "0" display key and the "1" display key on the numeric keypad 20, the binary code "00000001" representing "01" is stored in the internal RAM of the CPU 132 by scanning (steps) of the numeric keypad 20. Then, "01" is displayed on the display panel ₂₄₁ (step), and then "1" is stored in the address "00000001" of the nonvolatile RAM 36. When the write switch ₁₉₄ is turned on (step), the indicator light ₂₅₁ is turned on again. Then, when the operator presses, for example, the "0" display key and the "2" display key on the numeric keypad 20, the binary code "00000010" representing "02" is displayed in the internal RAM of the CPU 32 or
Stored in RAM35 and “02” is displayed on display panel 2
4 Displayed in ₁ (step), then non-volatile
“1” is stored in address “00000010” of RAM 36. Hereinafter, each time a desired 2-digit decimal code is input using the numeric keypad _{20 with the write switch 194} turned ON, "1" is stored in the address of the non-volatile RAM 36 corresponding to that code. . After entering the desired code, turn off the write switch ₁₉₄ , put on the cover 29,
Lock it down if necessary. In this state, codes such as "01", "02", etc. that enable copying and facsimile transmission are set in the copying apparatus. This code is assigned to the operator or to a section such as the department or division to which the operator belongs, and is hereinafter referred to as a personnel code. on the other hand,
``1'' is written to the address represented by the manuscript management code in the RAM 36 by the same write operation as described above.
This manuscript management code is a code that is attached to a manuscript when, for example, confidentiality is required and it is not desirable for anyone other than a specific person to copy or send a facsimile.

In this embodiment, when copying or sending a facsimile, the operator inputs a human code using the numeric keypad 20, and the input code is represented by this input code.
If "1" is stored in the address of RAM36, copying or facsimile transmission will be performed, and "1" will be sent.
When the information is not stored in the memory, the power to the device is turned off. The operation flow is the fifth
The steps shown in FIG. To explain this, when the power switch 18 is ON (step) and the write switch ₁₉₄ is OFF (step), the indicator light ₂₅₁ is energized to light (step). Therefore, the operator enters a code assigned to him or the section to which he belongs, that is, a personal code, for example "01", on the numeric keypad 20.
Input by pressing the “0” display key and the “1” display key. The electronic control unit 30 uses this as the numeric keypad 20.
is detected by scanning (step), and the binary code ``00000001'' representing it is sent to the first CPU13.
2 (step), the memory data is read out by specifying the address from the nonvolatile RAM 36, and it is checked whether the read data is "1" (step). In this case, since "1" is stored in the address "00000001" of the nonvolatile RAM 36, copying, facsimile transmission, etc. are performed. Operator, non-volatile
Code "χβ" other than the address specified in RAM36 and "1" memorized, however, α and β
When inputting any number from 0 to 9 using the numeric keypad 20, the RAM 36 is
Since the read data is "0", the power switch 18 is turned off (step). In this case, instead of turning off the power switch 18, the buzzer 27 may be energized, the alarm lamp may be turned on, the operator input code may be stored in the RAM 36, and the operator input code may be input to the magnetic recording device. The code may also be recorded. If the operator does not input a code, the copying machine remains in a standby state with the power turned on, and does not operate even if the print switch 21 is turned on.

Continuing the explanation with reference to Figure 3 again, the ROM
Connected to the input/output port 34 are a CCD element 16 for reading the image information and management information of the document, and a code reading circuit 50 for reading the management information. A reading control circuit is integrated into the CCD element 16. FIG. 4a shows the configuration of the code reading circuit 50. In this example, the code reading circuit 5
0 is the shift register SH, the first and second counters COU1 and COU2, and the AND gate AN1~
It consists of AN16 and flip-flops F1 to F15. A binarized image signal is given to the shift register SH by the comparator 40, which sets an image signal of a predetermined level Vref or higher to "1": black, and an image signal of less than a predetermined level to "0": white. 1728 pieces (8/mm
A main scanning synchronizing pulse is emitted at a rate of (scanning density) and used for reading out the CCD element 16. The shift register SH has 16-bit serial shift stages, and the outputs of each stage are all applied to the AND gate AN1. Therefore, when all 16 serial dots of the image signal are black: "1", the AND gate is activated. The output of AN1 becomes "1" and is applied to AND gates AN9 to AN15. The counter COU1 is set to 1 for each scan of one line on the short side of the original.
It is cleared by the sub-scanning synchronization pulses that are emitted at the rate of pulses, and counts the main-scanning synchronization pulses. Therefore, the count code of counter COU1 is
This indicates where the current reading scanning position (short side direction: main scanning X direction) of the original image is located. counter
COU2 is cleared by the print start signal,
Count sub-scanning synchronization pulses. Therefore, the count code of the counter COU2 indicates where the current reading scanning position (long side direction: sub-scanning Y direction) of the original image is located. And Gate AN2~
AN8 produces an output of "1" at the code position in the main scanning direction X on the document, and AND gate AN1
6 is a counter so as to produce an output of "1" at the code position in the sub-scanning direction Y on the document.
Connected to COU1 and COU2.

In this example, when one corner of the document IP is aligned with the reference point (reading scan start point) 00 of the reference frame SS of the document placement table as shown in FIG. 4b, seven marks M ₀ to M ₆ (7 binary digits 2 ⁰ each)
The AND gates ^AN2 to AN8 are connected to the counter COU1, and the AND gate AN16 is connected to the counter COU2 so as to read the counter COU2 (corresponding to 26). To explain this a little more concretely, Section 4c.
As shown in the figure, the shaded area is marked with black for the code, the length of y ₁ from the reference point 00 is 4 mm, the length of y ₂ is 8 mm, and x ₁ to x ₁₆ are Xi = 8×1imm,
When i=1~16, AND gate AN2~
AN8 outputs "1" when there is main scanning on x ₁ , x ₃ , x ₅ , ... x ₁₃ , respectively, and the AND gate
AN16 produces an output of "1" when the sub-scan is at _y1 , and flip-flops F1-F7 and F15 are set by the outputs of AND gates AN2-AN8 and AN16, respectively.
Flip-flops F1 to F7 have main scanning speeds of x ₂ ,
The flip-flop F15 is connected to _a counter _COU1 so as _to be reset when the sub-scan is at _y2 .
The Q output of flip-flop F15 is an AND gate.
The Q outputs of flip-flops F1 to F7 are applied to AND gates AN9 to AN15, respectively.
Therefore, the AND gate AN9 is turned on when the image reading scan is in the first digit code area 2 ⁰ (x ₁ , x ₂ , y ₁ , y ₂ ), and 2 mm (16 bits) in the main scanning direction.
If it is black throughout, that is, if a code index is present, an output of "1" is produced and flip-flop F8 is set. Similarly, when the image reading scan is performed in each of the code areas 2 ¹ to ^{2 6} , if 2 mm is black in the main scanning direction, each of the AND gates AN10 to AN15 is set to "1".
outputs from the flip-flops F9 to F9, respectively.
Set F14. In this way, whether the code index is in the defined areas ²⁰ to ²⁶ ("1") or not ("0") is set in the flip-flops F8 to F14. Note that the Q output of F15 is used as a signal to synchronize with the rotation of the drum 1 and cause the OFT 3 to emit light at corresponding positions y ₁ to y ₂ on the drum to prevent copying of the indices in the index areas 2 ⁰ to ^{2 6} . In the facsimile transmission mode, the signal is applied to the input/output port 31 as a signal to prevent the image from being read.
When the sub-scan reading reaches _y2 , a code reading command is given to the input/output port 31.

The copying operation and facsimile transmission operation based on the detected code of the code reading circuit 50 are performed in step 5a.
The steps in the flowchart shown below, and the subsequent steps in FIG. 5b, are shown below and will be described below. As mentioned above, the address is given by the human code entered by the operator using the numeric keypad 20.
When the memory in the RAM 36 is "1" (step), the switch ₁₉₁ for specifying the copy mode is first set.
Check whether it is ON or OFF (step), and if it is ON, turn on the indicator light ₂₅₂ to prompt input of the number of copies (step), scan the numeric keypad 20 (step), and input data using the numeric keypad 20. The designated number of images is stored in the internal RAM of the CPU 132 and displayed on the display unit ₂₄₁ (step). Then, wait until the print switch 21 is pressed (step), and then press the print switch 2.
When 1 is turned on, the program moves to the copy control program and controls the copy operation. During the copying operation, it is monitored whether or not a reading command has arrived from the code reading circuit 50 (step), and when the reading command arrives, the flip-flops F8 to F of the code reading circuit 50 are activated by an interrupt.
14 Q outputs are taken into the internal RAM of the CPU 1 32, and the code represented by the combination of the Q outputs is read out from the RAM 36 memory as an address to see if it is "1" (step).
If it is "0", the interrupt is stopped, and if it is "1", the indicator light 28b is turned on (step 〓〓), and the CPU 2
33 to read month, date, and time data, these data, the copy number data and the personal code stored in the content RAM of the CPU 1 are written into the RAM 36, and the process returns to the copy control program. The reading of the code reading circuit 50 is set so that this interruption is located between copy control input/output, and a mark for the management code is placed on the document at the corresponding position. If such an interruption is difficult in copy timing control,
The program setting may be made when the actual number of copies (displayed on the display unit ₂₄₂ ) becomes the set number of copies and copy timing control is no longer required.

In the above step, copy key switch 1
If ₉₁ is OFF, then it is checked whether the correction copy key switch ₁₉₂ is ON or not (step). When it is on, a modified copy is performed in the same flow (steps ~) as in the copy mode described above (steps ~). If the switch ₁₉₂ is OFF in step, it is checked whether the facsimile transmission key switch ₁₉₃ is ON or not (step), and if it is ON, it waits for the print switch 21 to be turned ON. Indicator light 25
The reason why ₂ is not activated is because the transmission is performed one by one, so there is no need to input the number of sheets. When the print switch 21 is turned on, the process moves to a facsimile transmission program. The following facsimile transmission is performed using the same steps as in the copy mode described above, but in this facsimile transmission, the number of copies is not stored in the RAM 36, but instead a code representing the facsimile transmission is stored. Facsimile transmission key ₁₉₃ is OFF in step
, this means that none of the copy key 19 ₁ , correction copy key 19 ₂ and facsimile transmission key are operated, so the buzzer 27
energize (step) to prompt the operation of one of them.

As mentioned above, in this example,
By writing "1" in the RAM 36 to the address specified by the human code and manuscript management code, the image processing operation will not start until the human code is input, preventing use by outsiders. thwarted. Then, when the operation starts, if the manuscript is assigned the manuscript management code, the month, date,
Time, input human code and manuscript management code
It is stored in RAM36. By pressing printer key PRK of printer PR, RAM36
A code representing the month, day, time, input human code, and manuscript management code is read from the address stored and given to the printer;
Printer PR outputs the data converted to decimal.
Using this print data, the administrator can check the status of copying and facsimile transmission of documents with management codes, and
It is easy to understand the correspondence of the person who did it. Note that if the memory data of the RAM 36 is printed out immediately when the power switch 18 is turned on and the printer key PRK is pressed, the operating information of the device is likely to be leaked.
Or one or two of the other keys 19 ₁ to 19 ₄
More than one button is pressed in a specific order (e.g.
It is preferable to set the printout start program data so that the printout is performed under the condition of 98).

Next, a portion that contributes to changing and copying a significant image into an meaningless image, and a portion that contributes to changing (restoring) an meaningless image to a meaningful image and copying will be described. Referring to Figure 3 again, ROM34
The input/output port 34 includes a first image information processing circuit 60 that changes the arrangement of pixel information of a significant image to create a pixel information array constituting an unintentional image, and a first image information processing circuit 60 that changes the arrangement of pixel information of an unintentional image. Second image information processing circuit 70 that creates a pixel information array constituting a significant image
is connected.

As shown in FIG. 6a, the first processing circuit 60 includes shift registers SR1 to SR5 ₂ and counters.
COU3, COU4, frequency divider (1/4 frequency division) PD1, R
-S flip-flop F16 to F19, T flip-flop F20, AND gate AN18 to AN
49 and OR gates OR3 to OR5. This first image information processing circuit 60 is connected to the short side (main scanning direction) of an A4 sheet as shown in FIG.
In pixel information sampling, where 8 pixels/mm is divided into 1728 pixels, and 8 lines/mm when the long side (sub-scanning direction) is 2400 lines, the distribution of pixel information is as shown in Figure 6d. This is a pixel information arrangement of an unexpected image that is different from the pixel information distribution shown in Fig. 2 and is difficult to visually recognize. In this first processing circuit 60 (FIG. 6a), the pixel information of the first to fourth lines of the scanning scan of the original is outputted from the OR gate OR3 with the pixel distribution unchanged, and the pixel information of the fifth to eighth lines is output as is. The pixel information is rearranged from the first 0 to 431 pixels after the 432 to 1727 pixels and output from the OR gate OR3.
The pixels of 863 to 863 are rearranged after pixels 864 to 1727 and output from OR gate OR3, and the pixel information of lines 13 to 16 is output from OR gate OR3 with the same pixel distribution. The pixel information distribution shown in FIG. 6d is created by shifting the pixel positions in stages as one group. The principle is that from the 1st line to the 4th line, from the 13th line to the 16th line... (hereinafter referred to as the 1st group of lines), there are three shift stages with a total of 1728 shift stages. While serially inputting 1728 pixel information for each line to registers SR1 to SR3,
Outputs the information in serial as it is, and while the registers SR1 to SR3 are outputting the information on the lines of this first group, only the AND gate AN27 is turned on and applied to the OR gate; from the 5th line to the 8th line, and the 17th line
line to the 20th line... (hereinafter referred to as the 2nd group line), while inputting the information for one line of the 1st line in the 2nd group to the shift registers SR1 to SR3, 0
~431 pixel data is input to shift register _SR41 , and data for one line of the second line is input to SR1.
~While inputting data to SR3, input the data of the first 0 to 431 pixels to shift register _SR42 , and first input the data of pixels 432 to 431 of the first line of SR2 and SR3.
1727 pixel data is output from AND gate AN28 (only the code 28 is shown in the figure) and then
AND gate AN of the data of 0 to 431 pixels of SR4 ₁
29, and while the data for one line of the third line is input to SR1 to SR3, the leading 0
While inputting ~431 pixel data to shift register _SR41 , first input the data of the second line of SR2 and SR3.
AND gate AN28 for data of 432 to 1728 pixels
Then, the data of pixels 0 to 431 of _SR42 is outputted from AND gate AN30.
Outputs 1727 pixel data, then 0 to 431
Pixel data is output; from the 9th line to the 12th line, from the 21st line to the 24th line, etc. (hereinafter referred to as the lines of the third group), the data of the pixels in the third group are output to shift registers SR1 to SR3. 1
While inputting the data for one line, input the data of the first 0 to 863 pixels to _SR51 ,
Data for one line of the second line from SR1 to SR3
While inputting the data to the first 0 to 863 pixels to _SR52 , first input the data from 864 to 1727 pixels of the first line of SR1 to the AND gate.
Output from AN31, then output the data of 0 to 863 pixels of _SR51 from AND gate AN32,
SR1 to SR3 data for one line of the third line
While inputting the data to the first 0 to 863 pixels to _SR51 , first input the data from 864 to 1727 pixels of the second line of SR1 to the AND gate.
By outputting from AN31 and then outputting the data of 0 to 863 pixels of _SR52 from AND gate AN33, first
Outputs data of 864 to 1727 pixels, then 0
It outputs ~863 pixel data.

Frequency divider PD1 divides the frequency of the sub-scanning synchronizing pulse, which is emitted for each main-scanning line, to 1/4.
Therefore, frequency divider PD1 generates one pulse every four lines of main scanning. This instructs to change the first, second, and third groups described above. Counter COU4 counts this frequency-divided pulse, outputs binary "00" while receiving pixel data of the first group line, outputs "01" during the second group, and outputs "01" for the third group line. Outputs "10" between. When the count value reaches "11", the AND gate AN49 produces a high level "1" output, and the counter COU4 is output through the OR gate OR5.
is cleared, so the counter COU4 becomes "00". AND gates AN46 to AN49 constitute a decoder, and when the output of counter COU4 is "00", AND gate AN46 produces an output of "1", which represents signal processing of the first group of lines. When the output of COU4 is "01", AND gate AN47 produces an output of "1", which represents the signal processing of the second group of lines.
If the output of COU4 is "10", AND gate AN
48 produces an output of "1", which represents the signal processing of the third group of lines.

The counter COU3 counts main scanning synchronizing pulses given at a rate of one pulse per pixel in the main scanning direction. The maximum count value is 1728 or more, and AND gates AN42 to AN are used to detect count values of 432, 864, 1296, and 1728, respectively.
45 is connected to counter COU3, and R-
The S flip-flops F16 to F19 are set at the rising edge of the output "1" of the AND gates AN42 to AN44, respectively, and reset at the rising edge of the output "1" of the AND gate AN45. Therefore, the Q output of F16 is "1" while the data of 431 to 1727 pixels is given to the circuit 60, and the Q output of F17 is 864 to 1727.
It is "1" while data of 1727 pixels is given, and the Q output of F18 is "1" while data of 1295 to 1727 pixels is given.

The T-flip-flop F20 performs an inversion operation as the sub-scan synchronizing pulse arrives, and its Q output changes from "0" to "1" to "0" to "1", and so on.
As mentioned above, this T-flip-flop F20 is used for shift registers _SR41 and _SR51 .
is used for writing on odd numbered lines and reading on even numbered lines, while SR4 ₂ and 5 ₂ are used for reading on odd numbered lines and writing on even numbered lines, so the timing control signal is It's to get it. Therefore, the output of F20 (“1” when it is an odd numbered line) is connected to AND gate AN19 and AN
23, and the Q output ("1" for even numbered lines) is given to AND gates AN21 and AN25. This will cause shift register SR4 ₁ and SR
Only the pixel data of the odd numbered line is applied to the input terminal of SR4 2 and SR5 2, and only the pixel data of the even numbered line is applied to the input terminal of SR4 _{2 and} SR5 ₂ .

Each output of the flip-flops F16 to F20 is given to AND gates AN34 to AN41, and the AND gate AN41 outputs a signal while the 0 to 431 pixel data of the odd numbered line arrives (the output of F16 is "1" and the output of F20 is "1"). 1”) produces an output of “1”, which is given to the AND gate AN20 through the OR gate OR6, so the shift register
_SR41 stores data of 0 to 431 pixels of odd numbered lines (write shift). AN40 generates an output of "1" while the data of 1295 to 1727 pixels of the even numbered line arrives (the Q output of F18 is "1" and the Q output of F20 is "1"), and this is the OR gate.
Since it is applied to the AND gate AN20 through OR6, _SR41 reads out the data of pixels 0 to 431 of the odd numbered line (read shift). and gate
Other shift registers SR5 ₂ ,
SR5 ₁ and SR4 ₁ are also written and read shifted in the same way.

As mentioned above, the AND gate AN27 connected to each of the shift registers SR3 to _SR52 receives a signal representing the signal processing group.
AND gates AN28 to AN33 provided to AN46 to AN48 and connected to shift registers SR1, SR2, and SR4 ₁ to SR5 _2, respectively.
A gate-on control signal is applied to match the extraction of read data from SR1 and SR2 with the extraction of read data from shift registers SR4 ₁ to SR5 ₂ . These gate-on control signals are the outputs of flip-flops F16-F20. With such timing control, pixel information obtained by changing the pixel distribution shown in FIG. 6c to the pixel distribution shown in FIG. 6d is obtained from the OR gate OR3. Therefore, as will be described later, main and sub-scanning synchronizing pulses are applied to the processing circuit 60 from the I/O port of the ROM 34, binary pixel data is applied from the comparator 40, and the OR gate is applied.
Give the output of OR3 to the video signal circuit of CFT3, make OFT3 emit light with pixel data "0", and OFT
By performing copying by optical image projection according to No. 3, although the original is visually legible, a copy that is not visually legible can be obtained. Therefore, by mail,
By using this copy for carrying around, organizing files, etc., secret management can be ensured.

Next, such a first pixel information processing circuit 6
The second image information processing circuit 70 that restores an image that is created and recorded using 0 and is not visually legible to the original legible image will be described. This second processing circuit 70 is, roughly speaking, a demodulator or restorer, and changes the pixel information distribution shown in FIG. 6d to the pixel information distribution shown in FIG. 6c. Its composition is the 6th
As shown in Figure b and explained below, this processing circuit 70
has the same configuration as the circuit 60. The difference is that shift registers SR6 to SR8 are serially connected by reversing the serial connection order of shift registers SR1 to SR3; in the second group of lines, the 0 of the read pixel (Figure 6d) ~
Since it is necessary to send the data of 1295 pixels after the data of 1296 to 1727 pixels, instead of SR4 ₁ and SR4 ₂
Shift registers SR9 ₁ and SR9 ₂ of 1296 shift stages are arranged, and 1296 to 1727 of shift register SR6 are arranged.
Because the data of the pixel (Figure 6d) is being read out.
The shift register _SR91 is set so as to read out the data of 0 to 1295 pixels (Fig. 6d) of _SR91 or _SR92 .
and the timing of writing and reading _SR92 (the count value of the number of main scanning synchronizing pulses) is different; the other parts are completely the same as the circuit 60,
Corresponding portions of circuits 60 and 70 overlap (and are shown as such) when viewed in superimposition of FIGS. 6a and 6b. Therefore, circuit 7
A detailed explanation of 0 will be omitted.

In this embodiment, when the switch ₁₉₅ is closed in the copy mode (switch ₁₉₁ on) and decimal "99" is specified with the numeric keypad 20, the first image information processing circuit 60 selects the CCD element 16. The pixel information of the original pixels (Fig. 6c) read by OFT3 is changed to an unreadable pixel information distribution, and
Copying is performed to obtain a copy by exposing the photoreceptor to light; when decimal "97" is specified, the second image information processing circuit 70 processes the original image read by the CCD element 16 (FIG. 6d). The pixel information is transferred to the original document image (6th page) of the copy currently on the document table.
Change the pixel distribution to the one shown in Figure c) and select drum 1 of OFT3.
Copying is performed by exposing a photoreceptor to light to obtain a copy. If the print switch 21 is closed without the switch ₁₉₅ being closed, the original image is transferred to the optical system (FMI) for the general copying described above.
-SMI-IMI-TMI-1), a copying operation is performed in which the image is projected onto the drum 1 and exposed. This kind of operation of switch ₁₉₅ and key switch 2
The branching of copy control in the copy mode according to the combination of 0 operations is shown in the steps 〓〓〓 to 〓〓 of Figs. 5a and 5b.

In addition, in the above-mentioned embodiment, the fourth
When the original code described with reference to FIG. b and FIG. will no longer appear. Therefore, a code generation circuit 80 is installed. The code generation circuit 80 is composed of OR gates OR1, OR2 and an AND gate AN17, as shown in FIG. 4A, and is connected to the code reading circuit 50. As already explained, in the code reading circuit 50, the CCD element 1
While the main scanning of No. 6 is in the code area, the Q outputs of flip-flops F1 to F7 are "1", and while the sub-scanning is in the code area, the Q output of F15 is "1".
It is. Therefore, in order to set the code of the original from which the image copy shown in FIG.
The Q output of is extracted by OR gate OR1, and F
15 Q output and further logical product, "01101011"
Set the output of AN17 to be "1" in the display area of "1" of the code, and use this as an OR gate.
The video signal is supplied to the I/O port of the ROM 34 through OR2. As a result, in modified copying using either circuit 60 or 70, a code mark representing "01101011" is recorded on the copy.

In the embodiment described above, a significant image is changed into an unintentional image and an unintentional image is changed into a significant image by exchanging pixel positions. By using the second circuit 70 as a decoding/decompressing device, the significant image becomes an unintentional image in which the distribution of the encoding code is copied, and the unintentional image consisting of the encoding code can be visually recognized and read. It is possible to return to a meaningful image. 1 per bit of encoded code
If a reading error occurs when a copy is read with the CCD element 16, m pixels in the main scanning direction and n lines in the sub-scanning direction should be assigned to one bit of the encoded code. For example, recording is performed with 2≦m and 2≦n. This can be done relatively easily by allocating m main scanning synchronizing pulses to one bit of the encoded code and writing them n times in the sub-scanning direction. In the case of reading encoded codes, pixel data is sampled using a pulse divided by 1/m of the main scanning synchronizing pulse and a pulse divided by 1/n of the sub-scanning synchronizing pulse, and then sent to the decoding/expanding device. Just give it. If more accuracy is desired, the original code may be used as a reference for reading the encoded code.

As described above, according to the present invention, a manuscript that requires confidentiality can be copied as a modified copy that makes no sense.
The manuscript can be incinerated or kept in strict storage, and copies can be filed, mailed, carried, etc., so there is little risk of confidential information being leaked, and it is easy to handle. Further, since the copy can be used as an original and can be modified and copied again to obtain a visually legible copy, deciphering is extremely easy.

As described above, according to the recording apparatus of the present invention, when the first recording means is selected by the selection means and a highly confidential original document is recorded on the first recording medium by the first recording means, this The meaning of the image on the first recording medium is unknown, and by storing the first recording medium in a file or the like, management becomes highly confidential.

When the custodian requires an image of the original manuscript, the selection means selects the second recording means, and the second recording means records the image on the second recording medium using the first recording medium as the manuscript. The image on the second recording medium becomes the image of the original document and can be visually read.

Therefore, the first recording medium, which cannot be visually read, can be stored in a highly confidential manner as an archival document, and the custodian can reproduce the original secret image on the second recording medium. Visual judgment can be continued.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration (mechanical section) of a copying machine that is an embodiment of the present invention, FIG. 2 is an enlarged plan view of the keyboard KB, and FIG. 3 is an electronic control unit 30 that controls its operation. FIG. 4A is a block diagram showing the structure of the code reading circuit 50 connected to the electronic control device 30.
Figure b is a plan view showing the position of the code mark on the manuscript;
FIG. 4c is a plan view showing the code mark reading area by the code reading circuit 50. FIGS. 5a and 5b are flowcharts showing the operation of the electronic control device 30, respectively. FIG. 6a is a block diagram showing the configuration of the first image information processing circuit 60, and FIG. 6b is a block diagram showing the configuration of the second image information processing circuit 70. FIGS. 6c and 6d are plan views showing the pixel information distribution on the original or copy, respectively. 1: Photosensitive drum, 2: Main charger,
3: OFT, 4: Developing device, 5: Static elimination charger,
6: Registration roller, 7: Transfer charger, 8:
Separation roller, 9: Transfer paper transport line, 10; Cleaning roller, 11: Cleaning blade,
12: OFT holder, 13: Substrate, 14: Half mirror, 15: Lens, 16: CCD element, 1
7: Electrical section, KB: Keyboard, 18: Power switch, 19 ₁ to 19 ₃ : Mode specification switch, 19
₄ : Write switch, 20: Numeric keypad, 21: Print switch, 22 ₁ , 22 ₂ , 23, 25 ₁ , 2
5 ₂ , 26 ₁ to 26 ₅ , 28a, 28b: indicator light,
24 ₁ , 24 ₂ : Display unit, 27 : Buzzer, 2
9: Cover, 30: Electronic control device, SS: Reference frame,
2 ⁰ to 2 ⁶ : Code index area.

Claims (1)

[Claims] 1. In a recording device that forms an image on a recording medium: a first image reading unit that reads an image on a document pixel by pixel; and image information read by the first image reading unit in pixel units. a first image pattern changing means for changing the image information distribution into a predetermined pattern or code different from the image information distribution on the document; and a first image forming means for recording an image on the first recording medium, which is different from the image on the document; a second image reading means for reading the information, a second image pattern changing means for changing the information read by the second image reading means to the image information distribution on the document;
and a second image forming means for forming an image on a second recording medium based on the information changed by the image pattern changing means, and changing the image on the first recording medium to the original image. A recording device comprising: second recording means for recording on a second recording medium; and selection means for selecting between the first recording means and the second recording means.