JPS61174577A - Electronic copying machine with additional information recording device - Google Patents

Abstract

PURPOSE:To form an excellent image having no fog by switching a developing bias boltage in two stages corresponding to an additional information display part and an original part and setting the set voltage of the additional information part larger than that of the original part. CONSTITUTION:The developing bias voltage is switched in two stages corresponding to the additional information display part and original part. Namely, the combination of code data and the bias voltage is predetermined and the voltage is varied by operating a keyboard 12 to find a bias voltage corresponding to an optimum image of additional information, thereby storing, for example, 650V in a control circuit 15. Similarly, the optimum bias for the original part, e.g. 480V is stored. Then, when a copy is taken, a high voltage generating circuit 16 switches those two voltages to copy auto data information and an original by a developing part 17, so an excellent image having no fog of additional information is formed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an electronic copying machine that is capable of recording additional information such as dates and pages, and more specifically, it is capable of obtaining high-quality copy images without fogging. The present invention relates to an electronic copying machine with an additional information recording device.

(Prior Art) An electronic copying machine exposes a charged drum to light in accordance with document information, and then forms a toner visible image on a static N latent image formed on the drum surface. This is a device that transfers the image onto recording paper. In recent years, this type of electronic copying machine has been widely used for copying information in all fields of industry. Recent electronic copying machines are commercially available that not only automatically copy a preset number of copies, but also have a zoom function for enlarging and reducing images.

FIG. 6 is a diagram showing an example of the configuration of a conventional electronic copying machine of this type. When the operator presses a copy start button (not shown), the illustrated device begins a copy operation. After the remaining toner on the drum 1 is scraped off by a blade in the cleaning section 2 and the drum 1 is rotating in the direction of the arrow, it is corona discharged by the charging electrode 3 and the entire surface of the drum 1 is charged with charges of seeds. It will be done.

The charges charged by the charging electrode 3 are transferred to a charge erasing section 4.
The charges in unnecessary parts are erased. Thereafter, the charged area of the drum 1 is exposed to an optical image signal, and an electrostatic latent image of the original image is formed on the drum surface. That is, the original I6 is irradiated with light from the exposure device 15, which is slidable in the direction of the arrow shown in the figure, and the reflected light containing the original information is transmitted to the drum 1 via the optical system shown in the figure, and the drum surface is exposed. Expose. As a result, the electrostatic latent image formed on the drum surface is converted into a visible image by adsorption of toner in the subsequent phenomenon section 7. The toner image on the drum surface is transferred to recording paper (copy paper) in the transfer section 8.
The recording paper that is in close contact with the drum 1 is separated. The separated recording paper is sent to the fixing roller 1o via the conveyance groove 9, and the recording paper is heated and pressurized by the fixing roller 10, so that the toner on the recording paper is fused to the recording paper, and the copying operation is completed. do.

By the way, in the developing unit 7 that visualizes the electrostatic latent image on the sensor (drum 1 in this case) using a developer, a DC high voltage generator that generates a DC of about 300 V to 500 V for the developing bias is used. The bias voltage is changed according to the density of the original, so that a copy image with the optimum density is always obtained.

Recently, electronic copying machines with a so-called auto-date function have appeared that can record the date of copying in addition to the copied image. In this device, for example, a liquid crystal display is pasted on the back of the scale plate of the document table to display the date, and the date is imprinted in addition to the document image at the time of copying the document.

(Problems to be Solved by the Invention) Due to the fact that the liquid crystal part and the original part have different reflectance and other characteristics, if they are copied at the same density, either the date image part or the original image part will have a so-called fog. This causes the quality of the copied image to deteriorate.

The present invention has been made in view of these points, and
The purpose is to realize an electronic copying machine with an additional information recording device that can obtain high-quality copy images without fogging.

(Means for Solving the Problems) The present invention solves the above-mentioned problems in an electronic copying machine with an additional information recording device configured to copy date information in addition to original images. The present invention is characterized in that the control amount for image formation in the information display section is set to be larger than that in the document image section.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. The embodiment shown in the figure was created based on the following facts. The applicant discovered the following facts through experiments. As described above, the bias voltage applied to the developing section 7 (see FIG. 6) is 300 V to 500 V. Fog was reduced by making the bias voltage different between the additional information display section such as the date display section and the document area section. However, even if the voltage is varied within the range of 300V to 500V, fogging cannot be completely eliminated. Therefore, when a high voltage of about 700 V was applied to only the additional information display section, the fogging completely disappeared.

In the figure, reference numeral 11 denotes an operation panel section composed of a keyboard 12 and a display section 13. The keyboard 12 includes a numeric keypad and function keys for various operations, and the display section 13 includes a copy magnification (variable magnification) display section,
It consists of a set number display section and other display sections. As a display means of the display unit 13, for example, a liquid crystal or an LED is used.
etc. are used.

14 is a keyboard interface connected to the keyboard 12; 15 is connected to the display unit 13 and the keyboard interface 14; it receives input signals from the keyboard 12 sent via the keyboard interface 14, performs various arithmetic controls, and displays the This is a control circuit that displays various information on the section 13 and outputs a bias voltage setting signal according to an input signal. The keyboard interface 14 receives the contact signal from the keyboard 12, converts it into a code signal corresponding to the contact signal, for example, an ASCff code, and provides it to the control circuit 15. As the control circuit 15, a microcomputer is used, for example, since it is necessary to perform various calculation controls.

16 is a high voltage generation circuit that receives a bias voltage setting signal from the control circuit 15 and generates a high voltage corresponding to the setting signal; 17 is a developing section that receives the output of the high voltage generation circuit 16 as a bias voltage; 5). The high voltage generating circuit 16 is one that generates a direct current high voltage of 100V to 700V, and whose output can be varied by an external setting signal.

FIG. 2 is a diagram showing a specific example of the configuration of the high voltage generation circuit 16. Upon receiving the setting signal, the pulse width modulation circuit 21 outputs a pulse having a duty ratio according to the input setting signal, and charges the capacitor C1. As a result, capacitor C! is charged with a charge according to the pulse width. That is, capacitor C
1, a direct current voltage is generated according to the input setting signal. This DC voltage is converted into an AC voltage by a subsequent switching circuit 22, and the AC voltage induced on the secondary side of the pulse transformer T is converted into a high voltage DC voltage by a high voltage rectifier circuit 23. The converted DC high voltage is applied to the developing section 17 as a bias voltage.

The operation of the device configured as described above will be explained as follows.

To set the bias voltage, operate the function keys on the keyboard 12 to put the electronic copying machine into a bias voltage setting mode. That is, after the contact signal from the keyboard 12 is decoded by the keyboard interface 14, *
It is transmitted to the JI11 circuit 15. The control circuit 15 receives a signal from the keyboard 12 and puts the entire @box into a bias voltage setting mode. As a result, in normal copying operations, the display section that displays the magnification is the input code display section, and the display section that displays the set number of sheets is the memory content display section that displays the contents of the nonvolatile memory built in the control circuit 15. become. The non-volatile memory described above is used to store various setting condition data whose contents should not be destroyed even when the power of the electronic copying machine is turned off. Data regarding voltage output values is stored.

FIG. 3 is a diagram showing the state of the display section 13, and (a) shows the state when the bias voltage setting mode is entered. That is, the magnification display section is 01, and the number display section is 1.
The 0 digit display "7" indicates the code data stored at address 01. The 1 digit is blank in the initial state.

The control circuit 15 stores in advance the relationship between code data and output voltage as shown in FIG. It has become.

For example, if you want to set the bias voltage of the date image section to 650V, perform the following operation.

The code data corresponding to 650V is 35 from FIG. Therefore, 35 ° “3” is set to address 21, and “5” is set to 2.
It is assumed that it must be stored at address 2. The operator operates the keyboard 12 to set the display on the magnification display section to "21" as shown in FIG. 3 (B). At this time, it is assumed that the data stored at address 21 of the nonvolatile memory is 09'' as shown in the figure.

The operator operates the keyboard 12 to input 3''.

As a result, the first line of the sheet count display shows “
3" is displayed. In this state, if you operate the keyboard 12, the contents of address 21 in the non-volatile memory will be replaced from "9" to 3", and the display will become as shown in (d). .

Next, a similar operation is performed to store "5" at address 22.

As a result, 21.2 of the nonvolatile memory in the control circuit 15
This means that the code "35" indicating the set voltage 650■ is stored at address 2. Incidentally, through a similar operation, the bias voltage setting value for developing the original image area is also input. The set voltage value at this time is smaller than that when developing the date image area.

In this manner, when the first bias voltage setting mode is completed, the operator operates the function keys on the keyboard 12 to change the mode of the electronic copying machine to the copy mode. , the control circuit 15 is a non-volatile memory 21.2.
It knows from the code data "35" stored at address 2 that the set voltage is 650V, and gives a setting signal to the high voltage generation circuit 16. The high voltage generating circuit 16 generates a voltage of 650 V according to the input setting signal and applies it to the developing section 17 as a bias voltage. After that, copy the original and check the original with auto date attached. If there is fog in the image, it means that the bias setting is not optimal, so the operator puts the electronic copying machine into the bias voltage setting mode again and repeats the above-described operation to change the setting value. Then, return to the copy mode again, copy, and check the image. Repeat the above operations until an optimal copy image with no fog is obtained.

Through the above operations, the same operation as in the bias setting mode of the additional information display section is also performed for the document area section.

For example, 480■ is set for the document area. Finally, the bias data for the additional information display section and the bias data for the document area section are stored in a nonvolatile newt in the control circuit 15. The code data stored in the nonvolatile memory in this state is optimal data.

After the above operations, when copying is performed, the developing bias becomes 650V when irradiating the additional information display area.
When the original image area is irradiated, the developing bias is set to 480 cm, and a fog-free copy image with auto-date is obtained. After shipment from the factory, the user does not need to perform the bias voltage setting mode described above, and can always obtain an optimal copy image with auto-date.

The applicant also discovered that good copy uniformity without fogging can be obtained even if the exposure amount of the exposure device 5 that irradiates the additional information display area and the original area is different between the additional information display area and the original area. did. That is, it has been found that fogging can be eliminated by setting the amount of light irradiated on the additional information display section to be larger than that on the original document section.

FIG. 5 is a configuration diagram showing another embodiment of the present invention. Components that are the same as those in FIG. 1 are designated with the same numbers. In the figure, 31 is a power supply circuit whose output voltage value is controlled by the control circuit 15, and 32 is an exposure apparatus driven by the power supply circuit 31. As the power supply circuit 31, for example, one configured to switch the taps of the transformer secondary winding using a relay to switch the output voltage in a plurality of stages is used. As the exposure device 32, a lamp such as a fluorescent lamp is used that illuminates all sides of the document with an equal amount of light. The exposure device 32 is the same as 5 in FIG. The operation of the device configured as described above will be explained as follows.

By the same operation as described with reference to FIG. 1, the set voltage values for the additional information display section and the original document section are stored in the nonvolatile memory in the control circuit 15. Thereafter, the copy mode is set and a voltage setting signal is sent from the control circuit 15 to the power supply circuit 31.

The power supply circuit 31 generates an AC voltage corresponding to the input setting signal and applies it to the exposure amount @32. As a result, the exposure device 3
2, the additional information display section and the original document section are irradiated with different amounts of light.

The operator checks the copy image, and if the copy quality is insufficient, inputs the set voltage values for the additional information display section and the original section again from the operation panel section 11, and stores them in the nonvolatile memory in the control circuit 15. do. Then, try copying under those conditions and check the copy quality. The above trial operations are repeated as many times as necessary to determine the optimal output voltage value of the power supply circuit 31 in each case. As a result, in the exposure 1i 1132, the additional information display section is irradiated with a larger amount of light than the original document section. As a result, a good quality copy image with no fog in the additional information display area can be obtained.

In the above explanation, the case where the voltage applied to the exposure amount W132 is set from the operation panel section 11 was explained as an example.
It is not necessarily necessary to follow this procedure. In a series of copy sequences, the output of the power supply circuit 31 is switched in two stages for the additional information display section and the original section in advance, and the output value is adjusted to the optimum value beforehand at the time of shipment from the factory. Just leave it there.

With this configuration, there is no need to perform an operation to determine the output of the power supply circuit 31 by setting from the operation panel section.
Non-volatile memory is also not required.

Note that the power supply circuit 31 does not necessarily have to be an AC power supply, and the light source for the exposure amount @32 does not necessarily have to be a fluorescent lamp. A DC power source or an incandescent light bulb can be used if necessary.

(Effects of the Invention) As described above in detail, according to the present invention, control I! for image formation! it (developing section bias voltage.

By switching the irradiation exposure amount in two stages for the additional information display section and the document section, and making the control amount for the additional information display section larger than that for the document section, it is possible to achieve high-quality images without fogging in the additional information display section. A copy image can be obtained, which has a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing a specific configuration example of a high voltage generation circuit, Fig. 3 is a diagram showing the sequence of the display section, and Fig. 4 is a diagram showing the code data and FIG. 5 is a diagram showing the relationship with the output voltage, FIG. 5 is a block diagram showing another embodiment of the present invention, and FIG. 6 is a diagram showing a configuration example of an electronic copying machine. 1...Drum 2...Cleaning section 3.
・・Charged electrode 4 ・Band N eraser 5.32 ・・
・Exposure @@ 6...Original 7...Development section 8
. . . Transfer section 9 . . . Conveyance structure 10 . . Fixing row 511 . . . Operation panel section 12 . ...High pressure generation circuit 17...Development section
21... Pulse width modulation circuit 22... Switching circuit 23... High voltage rectifier circuit 31... Power supply circuit C1, C
z... Capacitor patent applicant Roku Konishi Photo Industry Co., Ltd. Representative Patent attorney Fuji Ijima Jigai 1 person #i) 1 Figure 3 Figure (c) 1 Figure 4

Claims (1)

[Claims] In an electronic copying machine with an additional information recording device configured to be able to copy additional information in addition to the original image,
An electronic copying machine with an additional information recording device, characterized in that the control amount for image formation in the additional information display section is set larger than that in the original image section.