JPS6321670A - Electrostatic transfer type recorder - Google Patents

Abstract

PURPOSE:To improve the quality of a recording image without lowering processing speed by providing two sets of image forming means equipped with charge carriers, electrifying means, electrostatic latent image forming means, and developing means respectively. CONSTITUTION:A 1st operation system consisting of a 1st photosensitive drum 10 as a charge carrier, an electrifying charger 14 arranged at its periphery, etc., forms an electrostatic latent image corresponding to an original image on the drum 10 and also develops and visualize the image. A 2nd operation system consisting of a 2nd photosensitive drum 20, etc., similarly to the 1st operation system performs similar processing. Then, the operation systems control their operating means to form a visible image wherein the reproducibility of density of a visible image corresponding to the low-density part of the original image is given priority by one operation system while a visible image corresponding to the high density part by the other operation system. Consequently, the visible images formed by both operation systems are transferred one over the other to improve the quality of the recording image without lowering the processing speed.

Description

[Detailed description of the invention] ■Field of invention The present invention relates to an electrostatic transfer recording device, and particularly to an electrostatic transfer recording device.

The present invention relates to an electrostatic transfer type recording device that improves the density reproducibility of recorded images by recording images corresponding to the same original image multiple times.

■Conventional technology In electrostatic transfer recording devices, such as electrostatic copying devices,
A series of recording processes such as charging, exposure, development, and fixing are performed to record a copy of the H original image on a predetermined recording paper.

In this case, if the density of the original image and the density of the recorded image are in a proportional relationship, an image faithful to the original image can be reproduced.

Figure 2a shows the relationship between the original density and copy density when the developing bias voltage is adjusted, Figure 2b shows the relationship between the original density and copy density when the exposure light amount is adjusted, and Figure 2c shows the relationship between the photoreceptor band and the copy density. 3 is a graph showing the relationship between original density and copy density when the W1 voltage is adjusted. As can be seen from these graphs, the relationship between original density (OD) and copy density (ID) (hereinafter referred to as OD-ID characteristics) is determined by various parameters related to the recording process (developing bias voltage, exposure light amount, charging voltage). etc.), it is not possible to obtain a linear 0O-FD characteristic over a wide range.

For this reason, conventional copying machines, especially color copying machines, are currently equipped with a large number of parameter adjustment means to adjust various parameters to obtain the most preferable image depending on the type of original image. be. Therefore, in order to obtain a desirable copy, it is necessary to make a large number of test copies, and even if precise adjustments are made, sufficient image quality cannot be obtained for originals with a wide range of density changes, such as photographs. do not have.

In order to improve this inconvenience, multiple different 0D-
With ID characteristics, multiple times for one manuscript! A copying apparatus has been proposed which performs two recording processes and superimposes all the images created in each process to create a single copy.

See Figure 2d. By WRm various parameters as mentioned above, partially linear 0D-ID
The 0 curve a from which the characteristics can be obtained shows the 0D-ID characteristic that is linear in the high-density part of the original, and the curve @b shows the ○D-ID characteristic that is linear in the low-density part of the original. By superimposing an image created by adjusting various parameters to obtain the characteristics of the latter and an image created by adjusting various parameters to obtain the latter characteristics, a single copy is created. The relationship between the density of the superimposed copy and the density of the original is linear over a wide range as shown by curve C.

In other words, 1 equivalently, linear 0D-ID over a wide range
A copying device having the following characteristics is obtained.

Electrostatic transfer type color image recording device 1 For example, in an electrostatic transfer type color copying device, the circle of the song 111a (or curve b) is
Adjust various parameters to obtain D-ID characteristics,
One curve b is created in the image created by executing the recording process for each Y (yellow), C (cyan) and M (magenta) component.
An image created by adjusting various parameters to obtain the ○D-ID characteristics of (or song m a ) and executing the recording process for each Y (yellow), C (cyan), and M (magenta) component. Superimpose. As a result, the 0D-ID characteristics of the color original and the color copy become equal to curve C, and a color image faithful to the original image is reproduced.

However, in order to create a superimposed recorded image with two different OD-ID characteristics in this way, the recording process described above is required twice for each color. Therefore, in this type of copying machine, it takes about twice as much time to make one copy as in a normal copying machine that does not perform overlapping recording of the same color. In particular, color copying machines use three colors: yellow, magenta, and cyan (and black may also be used) to make a single copy. 4) Double the copying time is required, and in this case, by superimposing recorded images based on the two different 0D-ID characteristics, the reduction in copying speed becomes even more serious.

■Object of the Invention The present invention aims to improve the quality of recorded images without reducing the processing speed.

■Constitution of the invention Charge carrier; Charging means for charging the charge carrier; Electrostatic latent image forming means for forming an electrostatic latent image corresponding to the original image on the charged charge carrier; and Charge carrier A developing means for visualizing the electrostatic latent image formed on the electrostatic latent image; and a developing means for visualizing the electrostatic latent image; A visible image with a high reproducibility of the density of the visible image corresponding to the high density part of the original image is formed by the other image forming means. are formed and superposed and transferred onto a predetermined transfer medium.

According to this, since two sets of image forming means are provided, a visible image with high reproducibility of the density of the visible image corresponding to the low density part of the original image and a visible image with the density of the original image corresponding to the low density part of the original image are created almost simultaneously. It is possible to form a visible image with high reproducibility of the density of the visible image corresponding to the high-density area.1 The quality of the recorded image can be improved in the recording processing time that is almost the same as that of a conventional recording device that does not perform overlay. It can be made higher.

In this case, by changing the control parameters of the charging means, electrostatic latent image forming means, and/or developing means for each image forming means, it is possible to impart different 0D-ID characteristics to each image forming means.

Further, in the present invention, since each image forming means has a charge carrier, a charging means, an electrostatic latent image forming means, and a developing means, the physical conditions of each image forming means are , e.g., the physical properties of the charge carrier, the distance between the charge carrier and the electrical means.

By changing conditions such as the distance or angle between the charge carrier and the developing means, different ○D-Is can be applied to each image forming means.
D characteristics can be imparted.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a description will be given of the main mechanical parts of one type of color copying apparatus embodying the present invention.

This color copying device is of the original platen drive type.

It has a slider ICM (original platen) on which a document is placed and moves back and forth. The slider 1 is supported by a reciprocating drive mechanism (not shown) and is reciprocated in the left and right directions (L, R). In the state shown in FIG. 1, the slider 1 is at the home position (standby position).

The slider 1 includes a contact glass 2 on which an original is placed, and a pressure plate 3 for bringing the original onto the contact glass 2 into close contact.

Below the contact glass 2 there are a first slit 4 and a second slit 5, a first optical system and a first imaging system correspond to the first slit 4, and a second optical system corresponds to the second slit 5. system and a second imaging system, respectively.

The first optical system includes an exposure lamp 11. Mirror 12a.

12b, an in-mirror lens LNI, and a color separation filter 13 as main components.

The exposure lamp 11 is made up of a plurality of halogen lamps arranged in the direction in which the first slit 4 extends (perpendicular to the plane of the paper), and exposes the contact glass 2 from inside the first slit 4.
Illuminate the original above.

Mirror 12a, in-mirror lens LNI and mirror 1
2b guides the reflected light from the original to the photosensitive surface (surface) of the first photosensitive drum 10, which will be described next. In-mirror lens LNI
1 is a lens assembly having a reflection mirror therein, supported by a variable power drive mechanism (not shown), and positioned in the 9R and L directions according to the set variable power ratio.

The color separation filter 13 includes three filters, B (blue), G (green), and R (red), which are arranged at an angle of 120 degrees to each other.
It has two filter plates, and any one filter plate is selectively inserted into the optical path of the first optical system.

The first image forming system includes a first photosensitive drum 10 and a '#E electric charger 14. Eraser 15.
Yellow developing unit 16y, magenta developing unit 16
m, cyan developing unit 16C.

It is mainly composed of a cleaner 18 and a static elimination charger 19.

The first photoreceptor drum 10 has a structure in which a film-like photoreceptor is wound around the circumferential surface of a cylinder.

In particular, we use one that has excellent reproducibility at relatively low concentrations.

The charger 14 uniformly charges the photosensitive surface of the first photosensitive drum 10, and the eraser 15 removes static electricity from unnecessary areas of the photosensitive surface according to the size of the document.

One of the yellow developing units 16Y1 and the magenta developing unit 16m and the cyan developing unit 16c is selectively energized for development, and the photosensitive surface is developed with yellow toner, magenta toner, or cyan toner, respectively. Develop the electrostatic latent image.

A cleaner 18 cleans the photosensitive surface, and a charge eliminating charger 19 eliminates static electricity from the photosensitive surface.

The second optical system includes an exposure lamp 21. Mirror 22a.

22b, an in-mirror lens LN2, and a color separation filter 23 as main components.

The exposure lamp 21 is composed of a plurality of halogen lamps arranged in the direction in which the second slit 5 extends (perpendicular to the plane of the paper), and exposes the contact glass 2 from inside the second slit 5.
Illuminate the original above.

Mirror 22a, in-mirror lens LN2 and mirror 2
2b guides the reflected light from the original to the photosensitive surface (surface) of the second photosensitive drum 20, which will be described next. In-mirror lens LN2
1 is a lens assembly having a reflection mirror therein, which is supported by the magnification variable drive mechanism a (not shown) and positioned at a position in the R and L directions according to the set magnification rate.

The color separation filter 23 includes three filters, B (blue), G (green), and R (red), which are arranged at an angle of 120 degrees to each other.
It has two filter plates, and any one filter plate is selectively inserted into the optical path of the second optical system.

The second image forming system includes a second photoreceptor drum 20 and a charger 24 .disposed around the second photoreceptor drum 20 . Eraser 25. Yellow developing unit 26y, magenta developing unit 26m,
Cyan developing unit 26c.

It is mainly composed of a cleaner 28 and a static elimination charger 29.

The second photoreceptor drum 20 has a structure in which a film-like photoreceptor is wound around a cylindrical surface, and has the same size as the first photoreceptor drum 10. We use materials with excellent reproducibility. Note that the distance between the first photoreceptor drum 10 and the second photoreceptor drum 20 is shorter than the maximum copy size (A3 size) of the apparatus of this embodiment.

The charger 24 uniformly charges the photosensitive surface of the second photosensitive drum 20, and the eraser 25 removes static electricity from unnecessary areas of the photosensitive surface according to the document size.

Yellow developing unit 26y, magenta developing unit 26
M and cyan developing units 26c, one of which is selectively energized for development, develop the electrostatic latent image on the photosensitive surface with yellow toner, magenta toner, or cyan toner, respectively.

The cleaner 28 cleans the photosensitive surface, and the static elimination charger 29 eliminates static electricity from the photosensitive surface.

A common recording system is provided below the first image forming system and the second image forming system.6 The recording system includes a transfer belt 30. first transfer charger 17;
Second transfer charger 27. Static elimination charger 33a,
33 b, paper feed tray 40. Registration roller 42. Third
It includes a transfer charger 43, a fixing unit 50, and the like.

The transfer belt 30 is a dielectric film (a polyester film is used in this embodiment), and is stretched between conductive rollers 31 and 32 to cover the photosensitive surface of the first photosensitive drum 10 and the second photosensitive drum 10. It is slightly in contact with the photosensitive surface of the body drum 20.

The circumferential length of the transfer belt 30 is twice the circumferential length of the first photosensitive drum 10 and the second photosensitive drum 20.

The first transfer charger 17 is supported inside the loop of the transfer belt 30 and directly below the contact portion with the first photoreceptor drum 10, and transfers the toner image on the photosensitive surface onto the transfer belt 30.

The second transfer charger 27 is supported inside the loop of the transfer belt 30 and directly below the contact portion with the second photosensitive drum 20, and transfers the toner image on the photosensitive surface onto the transfer belt 30.

A pair of static eliminating chargers 33a and 33b supported oppositely with the transfer belt 30 in between performs static neutralization before transfer when transferring the toner image on the transfer belt 30 to recording paper.

The paper feed tray 40 holds a large number of recording papers, and these recording papers are fed out one by one by a paper feed roller 41.

The registration roller 42 feeds out the recording paper in synchronization with the transfer belt.

The third transfer charger 43 is supported in the paper feed path and transfers the toner image on the transfer belt 30 onto recording paper.

The fixing unit 50 includes a pair of fixing rollers 51 and a paper ejection roller 52. The fixing roller 51 includes a heater inside.

FIG. 5 is a timing chart schematically showing one copy process (process of making one copy) when making a full-color copy of B5 size (maximum A3 size).

The copying apparatus of the embodiment has a full-color copy mode for making a full-color copy of an original, and a yellow copy mode.

Although the printer has a single-color copy mode in which one of magenta and cyan is specified and a single-color copy is performed, one copy process in the full-color copy mode will be described first with reference to FIG. 5.

One copy process in full color copy mode consists of a start cycle, yellow image forming cycle, magenta image forming cycle, cyan image forming cycle, and end cycle.

When a copy start instruction is given, a start cycle is started, the main motor (153 in Figure 4) is energized, and the first
Photosensitive drum 10. The second photosensitive drum 20 and the transfer belt 30 are started to be driven in the directions of the arrows at the same surface speed. In the start cycle, the transfer belt 30 is rotated once to eliminate static electricity, and the first photoreceptor drum 10 and the second photoreceptor drum 20 are rotated twice to clean and eliminate static electricity from their respective photosensitive surfaces.

Furthermore, in the start cycle, slider 1 is driven to the left and set to the start position.

A recording paper is fed out from a paper feed tray 40 by a paper feed roller 41 and is kept on standby in a state in which it is in contact with a registration roller 42.

When the start cycle is completed, in the yellow image forming cycle, slider 1 is moved at a speed according to the set magnification ratio (10.20 & 30 surface speed for the same magnification; 1/n times the surface speed for 21x). A scanning drive is performed, in which the scanner is driven rightward from the start position at a speed of , to form an image corresponding to the yellow component of the original.

When the original placed on the slider 1 passes over the first slit 4, it is illuminated by an exposure lamp 11.

The reflected light is transferred to the mirror 12a and the in-mirror lens LNI.
In the yellow image forming cycle in which the image is guided to the photosensitive surface of the first photosensitive drum 10 via the mirror 12b, the blue filter plate of the color separation filter 13 is inserted into the optical path of the first optical system. The irradiation light forms an optical image corresponding to the yellow component of the original.

As the photosensitive drum 10 rotates, its photosensitive surface is charged when it passes directly under the charging charger 14, and when it passes directly under the eraser 15, unnecessary areas outside the document are neutralized to form an image forming area. When this area is irradiated with a light image corresponding to the yellow component of the original, an electrostatic latent image corresponding to the yellow component of the original is formed.

When this electrostatic latent image passes through the yellow developing unit 16y, it is visualized (developed) with yellow toner, and further,
When it passes directly over the first transfer charger 17, it transfers the toner image to the transfer belt 30.

When the trailing edge of the document passes through the first slit 4 by the movement of the slider 1, the exposure lamp 11 of the first optical system is turned off. Thereafter, the color separation filter 13 is updated and a green filter plate is inserted into the optical path of the first optical system.

Immediately before the leading edge of the document placed on the slider 1 approaches the second slit 5, the exposure lamp 21 of the second optical system is turned on, and the document passing over the second slit 5 is irradiated with reflected light. The light is guided to the photosensitive surface of the second photosensitive drum 20 via the mirror 22a, the in-mirror lens LN2, and the mirror 22b. In the yellow image forming cycle, the blue filter plate of the one-color separation filter 23 is inserted into the optical path of the second optical system, so that the irradiated light at this time forms an optical image corresponding to the yellow component of the original.

When the photosensitive surface of the photosensitive drum 20 passes directly under the charger 24 due to rotation of the photosensitive drum 20? iF Denshi, Eraser 25
When passing directly under the document, unnecessary areas outside the document are neutralized to form an image forming area. When this area is irradiated with a light image corresponding to the yellow component of the original, an electrostatic latent image corresponding to the yellow component of the original is formed.

When this electrostatic latent image passes through the yellow developing unit 26y, it is visualized (developed) with yellow toner, and further,
When it passes directly above the second transfer charger 27, the toner image is transferred onto the transfer belt 30, superimposed on the toner image corresponding to the yellow component of the document produced by the first image forming system.

When the trailing edge of the m document passes through the second slit 5 by the movement of the slider 1, the exposure lamp 21 of the first optical system is turned off, the scanning drive of the slider 1 is stopped, and the slider 1 is returned to the starting position. set. This embodiment is a quick return type, and during return driving, a return motor (not shown) is connected to the reciprocating drive mechanism of the slider 1. Thereafter, the color separation filter 23 is updated and a green filter plate is inserted into the optical path of the second optical system.

In the magenta image forming cycle, the slider 1 is driven for a second scan to form an image corresponding to the magenta component of the document in the same manner as described above. At this time, first, the magenta toner image of the first image forming system.

The toner image corresponding to the yellow component on the transfer belt 30 is transferred to be superimposed on the toner image, and the magenta toner image of the second image forming system is further transferred on top of the toner image.

In the cyan image forming cycle, the slider 1 is scan-driven for the third time, and the same as above.

An image corresponding to the cyan component of the original is created. At this time, first,
The cyan toner image of the first image forming system is superimposed on the toner image corresponding to the yellow component and the toner image corresponding to the magenta component on the transfer belt 30, and then the cyan toner image of the second image forming system is superimposed on the toner image corresponding to the yellow component and the toner image corresponding to the magenta component. Transfer the toner image.

When a full-color toner image is formed on the transfer belt 30 as described above, an end cycle is executed, and the transfer belt 30 is further rotated approximately one rotation, and the first photoreceptor drum 10 and the second photoreceptor drum 20 are rotated approximately two times. Rotate.

In the end cycle, when the toner image on the transfer belt 30 passes between the static elimination chargers 33a and 33b,
The toner of the toner image is easily peeled off from the transfer belt 30 by performing static elimination before transfer.

The registration roller 42 is biased to register at a predetermined timing, the recording paper is sent out at a speed equal to the surface speed of the transfer belt 30, the leading edge of the recording paper and the leading edge of the toner image are joined, and the third transfer charger 43 is activated. By.

The toner image is transferred to recording paper.

The recording paper onto which the toner image has been transferred is sent to a fixing unit 50 by a conveyance belt 44, where the toner image is thermally fixed and then ejected to a paper ejection tray 60 via a paper ejection roller 52.

In the end cycle, the photosensitive surfaces of the first photosensitive drum 10 and the second photosensitive drum 20 are further cleaned and neutralized.

When the end cycle is completed, the slider 1 is driven in the R direction, set from the start position to the home position, and enters a standby state. Note that if a copy start instruction is given while the end cycle is being executed, most of the start cycle is omitted and the above copy process is executed. Further, when repeating (copying multiple sheets), three image forming cycles are repeatedly executed, and an end cycle is executed after completing the cyan image forming cycle of the last copy.

In a 1-copy process in the monochrome copy mode, an image forming cycle of a specified color is executed next to a start cycle, and after that, an end cycle is executed.

Although not shown in the drawings, when making a copy of a larger size (for example, A3 size), the operation of each element of the first optical system and the first imaging system, and the operation of the second optical system and the second image forming system. The operations of each element of the image system overlap.

The operation of the embodiment apparatus described above is brought about by the control of the electrical control system shown in FIG. The electrical control system will be explained with reference to FIG.

Referring to FIG. 3, the electrical control system of this device is structured around a main control 100. Main control board 100
Inside, there is a microprocessor (MPU) 101. R
OM (read-only memory) 102, RAM (read/write memory) 103. NRAM (Normal Read/Write Memory) 104. A battery Btt for backing up the NRAM 104 is also provided.

The NRAM 104 is provided to store data that needs to be retained even when the power of the apparatus is cut off, such as values of various parameters set from a color balance setting board 300, which will be described later.

The main control board 100 includes programmable input/output interfaces 105, 106 . ．． 107 and 108 are connected.

Main components of the first optical system and the first imaging system are connected to the input/output interface 105. The high-voltage power supply unit 110 receives instructions from the main control board 100 and operates the charger 14 and the first transfer charger 1.
7. Static elimination charger 19 and each developing unit 16y
, 16m.

Predetermined electric power is supplied to each developing bias line 16c (not shown). The lamp regulator 111 receives instructions from the main control board 100 and controls the exposure lamp 11.
Adjust the exposure level.

Mainly components of the second optical system and the second imaging system are connected to the input/output interface 106. The high-voltage power supply unit 120 receives instructions from the main control board 100 and operates the charging charger 24 and the second transfer charger 2.
7. Static neutralization charger 29 and each developing unit "3)
'+26m.

Predetermined electric power is supplied to each developing bias line 26c (not shown). The lamp regulator 121 receives instructions from the main control board 100 and controls the exposure lamp 21.
Adjust the exposure level.

Mainly recording system components and other common elements are connected to the input/output interface 107. The registration detection sensor 131 detects the registration of the recording paper to the registration roller 42, the vapor end sensor 132 detects the presence or absence of recording paper in the paper feed tray 40, and the paper size sensor 133 detects the identification mark (Fig. (not shown)
The paper size is detected and the main control board 10 is activated.
Notify 0. In response to instructions from the main control board 100, the high voltage power supply unit 140 includes a static elimination charger 33a,
33b and the third transfer charger 43 are supplied with a predetermined power. A heater built into the fixing roller 51 of the fixing unit 50, various fan motors 151 and 152, and a main motor 153 are connected to the AC power supply unit 150. The main motor 153 is coupled to a rotary encoder PG, and the PG output is given to the main control board 100 via a signal processing circuit 160. Other driver & detection circuits 170 include one such as an in-mirror lens LN.
A stepping motor, a home position sensor, etc. for positioning I and 2 are connected.

An operation and display board 200 and a color balance setting board 300 are connected to the input/output interface 108 .

The operation and display board 200 is shown in Figure 4a. Referring to FIG. 4a, this operation board includes a print key 2012.
Interrupt key 202. Numeric keypad 203° Clear/stop key 204. Mode selection key 205, magnification key 206. Program keys 210゜220, 230, 240 and selection display lamps 211, 221 directly above each program key,
231, 241, and a display 250.

The mode selection key 205 is a key switch for selecting one of the aforementioned full color copy mode, yellow single color copy mode, magenta single color copy mode, and cyan single color copy mode.

The set mode is displayed on the display 250.

Note that the full color copy mode is set when the power is first turned on.

In this embodiment, the device is 1 normal (that is, when the power is turned on).

Based on actual measurements, the OD-ID characteristic closest to the curve C (Figure 2d) is obtained. Various adjustment parameters for the first optical system and first imaging system, and various adjustment parameters for the second optical system and second imaging system are set (hereinafter referred to as normal mode). 23
These various parameters can be changed by operating 0 or 240. That is, when the key 210 is operated, the operator calls and sets the various parameters previously registered in association with this key 210 (hereinafter referred to as A mode), and when the key 220 is operated, the operator When the key 230 is operated, the various parameters registered in association with the key 230 are called up and set (hereinafter referred to as B mode). (hereinafter referred to as C mode)
.

When the key 240 is operated, the normal mode shift parameters registered in advance by the operator in association with this key 240 and the various parameters of the normal mode are called up, and the various parameters of the normal mode are corrected with the shift parameters. (hereinafter referred to as D mode).

When key 210 is operated during A mode setting.

When key 220 is operated during B mode setting.

When key 230 is operated during C mode setting or D
When the key 240 is operated during mode setting, the mode being set is canceled and the normal mode is set. Also, while setting each mode.

Display lamps 211, 221゜231 directly above the corresponding keys
Or 241 lights up, and neither lights up in normal mode.

The color balance setting board 300 is shown in FIG. 4b. This setting board 300 is located near the operation and display board 200, but is usually covered with a cover (not shown). The large number of key switches provided in this device include a key switch for updating and setting each of the parameters in A mode, B mode, C mode, or D mode, and a key switch for registering them. This will be explained with reference to FIG. 4b.

The key 310 is a key switch that specifies updating of various adjustment parameters of the first optical system and the first imaging system, and the key 320 is a key switch that specifies updating of various adjustment parameters of the second optical system and the second imaging system. This is a key switch.

The six keys 330 are for adjusting (up, down) the developing bias voltage of the designated imaging system for each of Y, M, and C, and the six keys 340 are for adjusting the developing bias voltage of the designated imaging system. It is used to adjust the voltage (charge level) applied to the charger for each of Y, M, and C, and the six keys 350 are used to adjust the exposure level of the exposure lamp of the specified optical system for Y, M, and C. This is for adjusting each. The development bias, charging level, and exposure level can each be adjusted in 16 steps.

The key 360 is a memory key for storing each updated parameter in the memory in the setting mode.

Immediately above the keys 310 and 320 on the display 370 is a display that displays the system being selected. In addition, nine 7-segment numeric displays are provided directly above the keys 330, 340° and 350, with Y, M, C
development bias, Y.

M, C charge level, Y, M, C exposure level.

A display digit is assigned to each. Note that the development bias, charging level, and exposure level.

Each of the 16 stages is 0, 1, 2, 3, 4°5.6
,7,8,9. Sixteen numbers and symbols A, B, C, D, E and F are displayed in each display digit.

FIG. 6 is a flowchart showing an overview of the operation of the copying machine shown in FIG. This will be explained with reference to FIG.

When the power is turned on, initial settings are performed first. Specifically, the output port is set to the initial state, internal memory, registers, flags, etc. are cleared, and slider 1. In-mirror lens LNI, LN2. The positions of the movable parts such as color separation filters 13 and 23 are set to the initial state (home position), and accordingly, the registers that store the values corresponding to the positions of the movable parts are set to the reference values, and each Set the control unit to operational status. The operation mode is set to full color copy mode and normal mode.

After the initial settings, we repeatedly check the status of each part (fixing temperature, etc.), and if there is an abnormality, we wait for the abnormality to be corrected.
If there is no abnormality, check the status of each part by displaying "copy not possible" on the display 250 of the operation and display board 200 until it becomes operational.

Repeatedly execute key manual processing, etc. When the operation is completed (Ready), "Copy possible" is displayed on the display 250 of the operation & display board 200, and the print key 201 is displayed.
Repeat the above process until is pressed.

The "key manual processing" subroutine is shown in FIG. 7a.

This is shown in Figures 7b, 7c and 7d. This subroutine reads the key force, and if there is a key force,
Process accordingly.

The key-on flag is a flag for reading only the first rise in human power to operate the key in continuous operation of the same key or simultaneous operation of multiple keys, and therefore, this flag is reset when there is no human power on the key.

However, as for the print key 201, continuous operation is allowed, so regardless of this key-on flag,
When the print key 201 is operated, a start flag is set, and when the print key 201 is no longer operated, the start flag is reset.

When the key 205 is operated, the RA register is incremented by one. The values of the RA register correspond to 0, full color copy mode, yellow single color copy mode, 2, magenta single color copy mode, and 3, cyan single color copy mode, respectively.

When the value of RA is 4, that is, when the cyan monochrome copy mode is selected, if this key 205 is further operated, the value of RA is set to O and the full color copy mode is selected.

When the magnification key 206 is operated, the in-mirror lens LN
1 and LN2 position control and magnification control to update and set the scan speed of slider 1.
Alternatively, when the clear/stop key 204 is operated, the number of copies is set in accordance with the key operation. After controlling these, a predetermined display is performed in the display process (FIG. 7d), and the process returns to the main routine shown in FIG. 6.

Here, the configuration of the memory that stores each of the parameters will be explained with reference to FIG. 15. Referring to the memory map shown in FIG. 15, part of the RAM 103 and NRAM
The memory block consisting of part of 104 includes Y, M, C
For each color, the memories M I 11 , M I 2
1, M I 31. M I 12.

M I 22 1 M I 32 g M N
11 HM N 21 HM N31, MHI
□ , MN2□ + MN 32 + MA 1
1 + MA21 , MA31 , MA12 ,
MA2゜, MA3□, MBII, MB21,
MB31, MB12 *MB22 + MB
32p MCI! r MC21* M
C31, MCI2, MC22, MC32+ MDI
t + M D 21 + M D 3 l, M
Memory areas corresponding to D1□, M, D22 and MD321C are provided.

Memory MI1. ~MI 31 and MI 12~M
The data being set is stored in I32, and MN11 to MN
31 and MN12 to MN32 have normal mode data, MA11 to MA31 and MA12 to MA
32 contains A mode data, MB11 to MB31 and MB12 to MB32 contain B mode data, and MCI
I~MC31 and MC1□~MC32 have C mode data, MD11~MD3s and MD12
~MD32 stores D mode data, respectively. Memory M111. MN11. MAII、MBI、、
The data stored in MC11 and MDll is used as a parameter for adjusting the developing bias voltage of the first image forming system.
12, MN12, MA12 HMB 12, MC
:1□ and the data stored in MDI2 are used as parameters for adjusting the developing bias voltage of the second image forming system.
．． , MN21, MA2. , MB21, MC21 and Mn21 are used as parameters for adjusting the charging level of the first imaging system, MI2□, MN22. M.A.
2□, MB22. The data stored in MC22 and Mn22 is a parameter for adjusting the charging level of the second imaging system, MI31°MN31+ MA3t, MB3t p
MC3t and Mn2. The data stored in MI32. is used as a parameter for adjusting the exposure level of the first optical system.
MN3□, MA32, MB3□, MC32 and MD
The data stored in 3□ correspond to parameters for adjusting the exposure level of the second optical system.

Referring to FIG. 7b, program keys 210° 220
．． When 230 or 240 is operated, the following processing is performed in response.

In response to the operation of the key 210, if the value of the RG register is not 1, the register is set to 1, and the memory MA 11
, MA21 and MA3t to memories MIII, MI2., respectively. and MI 31, and the contents of memories MA12, MA22 and MA32 are stored in 5 mol MI t2. Store in MI 22 and MI 32 to set A mode, and if the value of the RG register is 1, set O to the register, and store in the memory MNI 1 ,
The contents of MN21 and MN31 are stored in memory M11 respectively.
1. Stored in MI21 and MI31, memory M N
12, the contents of MN22 and MN32 are stored in the memories M112, MI22 and MI32, respectively, and the normal mode is set.

In response to the operation of the key 220, if the value of the RG register is not 2, the register is set to 2, and the memory MB1 is
The contents of MB2t and MB31 are respectively stored in memories MI11.s, MB2t and MB31. MI2t and MI31, and memory MB12. The contents of MB2□ and MB3□ are respectively stored in memory MI12. B mode is set by storing in MI22 and MI3□, and if the value of the RG register is 2, normal mode is set in the same manner as above.

In response to the operation of the key 230, if the value of the RG register is not 3, the register is set to 3, and the memory MC11,
The contents of MC2t and MC31 are stored in memory MII.
I, MI21 and MI31, memory MC1
2. Save the contents of MC22 and MC32 to memory M
Store in I 12 , MI 22 and MI 32 and C
The mode is set, and if the value of the RG register is 3, the normal mode is set in the same manner as above.

In response to the operation of the key 240, if the value of the RG register is not 4, the register is set to 4, and the memory MDII
, MD21 and MD31 are stored in memory MI.
II, MI21 and MI31, memory MD
I2. The contents of MD22 and MD32 are stored in the memories MI12, MI22 and MI3□, respectively, to set the C mode, and if the value of the RG register is 4, the normal mode is set in the same manner as above.

In other words, the value of the RG register is 0 for normal mode and 1 for normal mode.
is A mode, 2 is B mode, and 3 is C mode.

4 respectively correspond to C mode, and if the mode corresponding to the operation program key is different from the mode being set, the mode corresponding to the operation program key is updated and set, and if it is equal to the mode being set. cancels the current mode and sets normal mode.

After the above-described mode setting according to the program key operation is performed, display processing (FIG. 7d) is executed, and the process returns to the main routine shown in FIG. 6.

Also, when the key 310 of the color balance setting board 300 is operated, the RB register is set to 0, and the key 32
When 0 is manipulated, the RB register is set to 1. R
As for the value of the B register, 0 indicates a change in the parameters related to the first imaging system and the first optical system, and 1 indicates a change in the parameters related to the second imaging system and the second optical system.

Referring to FIG. 7c, outside normal mode, i.e.
When the value of the RG register is other than 0, the following process is executed in response to the operation of the keys 330, 340, or 350 of the color balance setting board 300.

When the key 330 (any one of the six keys) is operated, it is determined whether the operation is an up key (Δ mark) or a down key (mark). If it is a down key operation, then check the value of the RB register, and if the value is 0, decrement the contents of memory MIII (only the one corresponding to the key turned on among Y, M, and C) by 1 ( -1) to do;
However, as mentioned above, the contents of memory MIII are
This corresponds to a parameter for adjusting the developing bias of the image forming system in 16 steps, so if the content is 0, this operation is canceled. If the value of the RB register is 1, the memory M
Decrement (-1) the contents of I 12 (only the one corresponding to the key turned on among Y, M, and C). However, as mentioned above, the contents of memory MII2 are the developing bias of the second image forming system. This corresponds to a parameter that adjusts the value in 16 steps, so if the content is O, this operation is canceled.

Also, when the up key is operated, the
Check the value of the RB register, and if the value is O, the memory M
I 11 Increment (+1) the contents of (only the one corresponding to the key turned on among Y, M, and C). However, if the content of the memory M I 11 is 15, this operation is canceled. If the value of the RB register is 1,
The contents of the memory MI12 (only the one corresponding to the key turned on among Y, M, and C) is incremented by 1 (-1).

However, if the content of the memory MII□ is 15, this operation is canceled.

When the key 340 (any one of the six keys) is operated, it is determined whether the operation is an up key (△ mark) or a down key (mark). , the value of the RB register is checked, and if the value is O, the contents of the memory MI21 (only the one corresponding to the key turned on among Y, M, and C) is decremented by 1 (-1).

However, as described above, the contents of the memory M I 21 correspond to the parameters for adjusting the charging level of the first image forming system in 16 steps, so if the contents are 0, this operation is canceled. If the value of the RB register is 1, the contents of the memory MI22 (only those corresponding to the key turned on among Y, M, and C) are decremented by 1 (-1). The content of 22 is the second
This corresponds to a parameter for adjusting the charging level of the image forming system to 16 levels, so if the content is 0, this operation is canceled.

Also, when the up key is operated, the
Check the value of the RB register, and if the value is 0, the memory M
Increment the contents of I 21 (only those corresponding to the key turned on among Y, M, and C) by 1 (+1)
do. However, memory MI 2. If the content is 15, cancel this operation. If the value of the RB register is 1, the contents of memory MI22 (only the one corresponding to the key turned on among Y, M, and C) is incremented by 1 (-1
)do.

However, if the content of the memory M I 22 is 15, this operation is canceled.

When the key 350 (any one of the six keys) is operated, it is determined whether the operation is an up key (Δ mark) or a down key (mark). If it is a down key operation, next check the value of the RB register, and if the value is 0, the contents of the memory MI 3 t (only the one corresponding to the key turned on among Y, M, and C) is set to 1. Decrement (-1). However, as described above, the contents of the memory M I 31 correspond to parameters for adjusting the exposure level of the first optical system in 16 steps, so if the contents are O, this operation is canceled. If the value of the RB register is 1, the contents of the memory Ml 32 (only the one corresponding to the key turned on among Y, M, and C) is decremented by 1 (-1). However, as described above, the contents of the memory MI22 correspond to parameters for adjusting the exposure level of the second optical system in 16 steps, so if the contents are O, this operation is canceled.

Also, when the up key is operated, the
Check the value of the RB register, and if the value is 0, the memory M
Increment the contents of I 3 l (Y+ only the one corresponding to the turned-on key among M and C) by 1 (+1). However, memory MI3. If the content is 15, cancel this operation. If the value of the RB register is 1, the contents of the memory MI32 (only the one corresponding to the turned-on key among Y, M, and C) is incremented by 1 (-1).

However, if the content of the memory MI32 is 15, this operation is canceled.

As described above, memory MIII, M112. M121, M
I22. MI3. Alternatively, after updating the contents of M I 32, display processing is executed. At this time, when the parameters related to the first imaging system and the first optical system are updated (the value of the RB register is 0) - the memory MI11. M.I.
When the contents of MI 21 and MI 31 (Y, M, and C, respectively) are displayed on the display 370, and the parameters regarding the second imaging system and the second optical system are updated (the value of the RB register is 1), Memory MI 12. The contents of MI 22 and MI 32 (Y, M, and C, respectively) are displayed on the display 370.

Referring to FIG. 8d, outside the normal mode, i.e.
When the value of the RG register is other than O, in response to the operation of the memory key 360 of the color balance setting board 300, the various parameters updated as described above are set to NR.
A.M.I. Register on 04.

That is, when RG=1, for each of Y, M, and C, the memory M I 11. M I 21, M I
31rMI 12 v The contents of MI 22 and MI32 are transferred to memories MAI H, MA21 p MA31
, MAL□.

Store in MA22 and MA3□; Y when RG=2
, M, and C, the memory M11 r y
M I 2 t r M I 31r M Eng 12t
The contents of MI22 and MI32 are transferred to memory MB1.
1 + MB21, MB31, MB12, MB
22 and MB32, Y when 1RG=3,
For each of M and C, the memory M I 11 ,
MI21, MI31. The contents of M11□IMI22 and M I32 are stored in memory M C11 + M C
21+ MC31HMC12, MC2□ and CB
When RG=4, the memory M I 11 p M I 21 p is stored for each of Y, M, and C.
M I 31 p M I , 12 The contents of HMT22 and M I 32 are transferred to memories MD11 and MD2.
1, MD31, MDI. , MD22 and MC
3 Store in □. Therefore, next, program key 2
10, 220, 230, 240 or 250 is operated, A mode, B mode.

When setting C mode or D mode, the parameters registered at this time are read out and the mode corresponding to the key operation is set.

If a key operation other than the above is performed, the corresponding process is performed and the process returns to the main routine shown in FIG.

Referring again to FIG. If the print key 201 is operated after rReadyJ is set and the start flag is set in the "key manual processing", the start flag and key-on flag are reset and the "register set" subroutine is executed.

FIG. 8 shows the "register set" subroutine.

In this case, when the full color copy mode is set, that is, when the value of the RA register is 0, the counter CN 11. used in the following copy process is set. 'CN
21. CN31, CN4), CN12 r CN
22 r CN 32 + CN 42 and CN5 values are all set to l, color separation filters 13 and 2
Set the filter plate 3 to blue.

When setting monochrome copy mode, i.e. RA
When the register value is 1, 2 or 3, the counter CN
11 + CN 2 t v CN 3 t r C
N 41 + CN 12 y CN 221 CN 3
21 The values of CN 42 and CN5 are all set to 3, and the filter plates of the one-color separation filters 13 and 23 are set to the color corresponding to the selected color. Set it to green when in monochrome copy mode (RA=2), and set to red when in cyan monochrome copy mode (RA=3).

Also, when setting D mode (RG=4),
Memory M111+M for each of Y, M, and C
I 2 t + M I 3 s * M I 12
+7 The contents of M r 22 and M I 32 correspond to each parameter of normal mode, that is, memory MN 11 ,
MN 21 , MN3 H+ MN l 2 , M
Shift the contents of N22 and MN32. In this case, the former 8 is used as the standard.

When it is smaller, the difference is subtracted from the latter, and when it is larger, it is added to the latter. In other words,
When you want to slightly change each parameter in normal mode, you can change it with a minimum of key operations by selecting D mode. After shifting each parameter in normal mode, you can store them in memory again. M
I 11 + MI 21 , MI 31 , MI 12
, Ml 22 and MI32. After this, as mentioned above.

Since there are 16 adjustment stages of development bias, charging level, and exposure level, the memories Mzt, Mr2+, MI
31. MI 12 r Correction is performed so that the contents of MI 22 and MI 32 are within the range of 0 to 15.

When the "register set" subroutine is executed and the main routine is returned, the start cycle described above is performed, cleaning the first photoreceptor drum IO and the second photoreceptor drum 20, removing static electricity from the transfer belt 30, and starting the slider 1. Perform position setting, etc.

After this, based on the setting mode, select "IF electric sub control.

"Slider control J, r exposure control", "developing bias control", "transfer control", "recording side 5jlIJ" subroutines, and other controls are repeatedly executed in short cycles until copying is completed (hereinafter, This is called a copy processing loop).

The "charging control" subroutine will be explained with reference to FIG.

In this case, counter CN2. If the value of is 3 or less, in the above copy processing loop, when the charging start timing of the 14th image system (#1 charging start timing) comes, in the full color copy mode (RA=O), the memory MI
21, a parameter indicating the charging level stored in the memory area corresponding to the counter CN21, that is, the counter C
When the value of N21 is 1, it is yellow (Y), and when it is 2, it is magenta (M).

3, the charging voltage is set with the parameter corresponding to cyan (C); in monochrome copy mode (RA≠0), it indicates the charging level stored in the memory area corresponding to the RA register in the memory MI 21. parameters, i.e.
When the RA register value is 1, it is yellow (Y), and when it is 2, it is magenta (M).

3, set the charging voltage with the parameter corresponding to cyan (C);
instructs the energization of the

Further, when the charging end timing of the first image forming system (#l charging end timing) has elapsed, the high voltage power supply 110
Instructs to release the voltage applied to the charger 14, and increments the counter CN21 by 1 (+1).

In addition, in the "IF electric control" subroutine, if the value of counter CN2□ is 3 or less, in the copy processing loop,
When the charging start timing of the second image forming system (#2*ffi start timing) comes, full color copy mode (RA=
O), the parameter indicating the charging level stored in the memory area corresponding to the counter CN22 of the memory MI22, that is, when the value of the counter CN22 is 1, it is yellow (
Y), 2 is magenta (M), 3 is cyan (
C).

In the monochrome copy mode (RA%O), the parameter indicating the charging level stored in the memory area corresponding to the RA register of the memory MI22, that is, the value of the RA register is set to 1. When it is , it is yellow (Y), when it is 2, it is magenta (M), and when it is 3, it is cyan (C).

The charging voltage is set using a parameter corresponding to: The high-voltage power supply 120 is instructed to energize the charger 24.

After further time passes, when the charging end timing of the second imaging system (#2 charging end timing) is reached, the high voltage power supply 120
Instructs to release the voltage applied to the charger 24, and increments the counter CN2□ by 1 (+1).

The "slider control" subroutine will be explained with reference to FIG.

In this case, if the value of counter CN5 is 3 or less, the copy processing loop starts, and at the start timing,
The driver & detection circuit 170 is instructed to start scanning, and when the end timing has elapsed, it is instructed to stop scanning and start return. When slider 1 reaches the start position, it is instructed to stop return, and counter CN5 is Increment by 1 (+1).

The "exposure control" subroutine will be explained with reference to FIG.

In this case, counter CN3. If the value of is 3 or less, in the copy processing loop, when the exposure start timing of the first optical system (#1 exposure start timing) comes, in the full color copy mode (RA=O), the
The parameter indicating the exposure level stored in the memory area corresponding to counter CN31, that is, when the value of counter CN31 is 1, it is yellow (Y), and when it is 2, it is magenta (M
).

3, the exposure level is set with the parameter corresponding to cyan (C); in monochrome copy mode (RA≠0), the parameter indicating the exposure level is stored in the memory area corresponding to the RA register of memory MI31. , that is, R
When the A register value is 1, it is yellow (Y), and when it is 2, it is magenta (M).

3, the exposure level is set using a parameter corresponding to cyan (C); the lamp regulator 111 is instructed to activate the exposure lamp 11.

Further, when the exposure end timing of the first optical system (81@light end timing) is reached after further time has elapsed, the lamp regulator 111 is instructed to turn off the exposure lamp 11, and the counter CN31 is incremented by one (+1). At this time,
If the full color copy mode is set, an update of the filter 13 is instructed.

Also, in the "exposure control" subroutine, the counter C
If the value of N32 is 3 or less, in the copy processing loop, when the exposure start timing of the second optical system (#2 exposure start timing) comes, in the full color copy mode (RA=O), the memory MI32.

The parameter indicating the exposure level stored in the memory area corresponding to the counter CN32, that is, the counter CN32
When the value is 1, it is yellow (Y), and when it is 2, it is magenta (
M), 3 is cyan (C).

Set the exposure level with the parameter corresponding to: In monochrome copy mode (RA%O), the RA of memory MI3°
A parameter indicating the exposure level stored in the memory area corresponding to the register, that is, when the value of the RA register is 1, it is yellow (Y), when it is 2, it is magenta (M), and when it is 3, it is cyan (C).

The exposure level is set using a parameter corresponding to the exposure level; the lamp regulator 121 is instructed to activate the exposure lamp 21.

After further time passes, when the exposure end timing of the second optical system (#2 exposure end timing) is reached, the lamp regulator 121 is instructed to turn off the exposure lamp 21, and the counter CN32 is incremented by 1 (+1). ,
If the full color copy mode is set, an update of the filter 23 is instructed.

The "developing bias control" subroutine will be explained with reference to FIG.

In this case, if the value of the counter CN11 is 3 or less, in the copy processing loop, when the developing bias application timing (#1 application timing) of the first image forming system comes, in the full color copy mode (RA=O), the memory The parameter indicating the developing bias application level stored in the memory area corresponding to counter CN11 of MIII, that is, counter CNI! When the value is 1, the developing bias voltage is set to yellow (Y), when it is 2, it is magenta (M), and when it is 3, it is cyan (C). Set the developing bias voltage with the corresponding parameter; Monochrome copy mode (RA≠0) Now, RA of memory M111
The parameter indicating the development bias application level stored in the memory area corresponding to the register, that is, when the value of the RA register is 1, it is yellow (Y), and when it is 2, it is magenta (M
), 3, cyan (C), and the developing bias voltage is set with the parameter corresponding to cyan (C): the high voltage power supply 110 is instructed to apply the developing bias voltage (#1 developing bias) of the corresponding developing unit.

After further time has elapsed, when the development bias application end timing of the first image forming system (#1 application end timing) is reached,
The high-voltage power supply 110 is instructed to cancel the application of the developing bias voltage (#1 developing bias) of the corresponding developing unit, and the counter CN11 is incremented by 1 (+1).

In addition, in the "development bias control" subroutine, if the value of the counter CNI□ is 3 or less, the development bias application timing (#2
application timing).

In full color copy mode (RA=O), memory MI
A parameter indicating the developing bias application level stored in the memory area corresponding to the counter CNI2 of I2, that is, when the value of the counter CN12 is 1, it is yellow (Y), and when it is 2, it is magenta (M).

3, set the developing bias voltage with the parameter corresponding to cyan (C): Monochrome copy mode (RA≠0
), the parameter indicating the development bias application level stored in the memory area corresponding to the RA register in the memory MI 12, that is, when the value of the RA register is 1, it is yellow (Y), and when it is 2, it is magenta (M). , 3, the developing bias applied voltage is set with the parameter corresponding to cyan (C); the high voltage power supply 120 is instructed to apply the developing bias voltage (#1 developing bias) of the corresponding developing unit.

After further time has elapsed, when the second image forming system develops bias application end timing (#2 application end timing),
The high voltage power supply 120 is instructed to cancel the application of the developing bias voltage (#1 developing bias) of the corresponding developing unit, and the counter CN12 is incremented by 1 (+1).

The r transcription control J subroutine will be explained with reference to FIG.

In the copying apparatus of this embodiment, in the full-power color copy mode, each image forming system performs three transfers, so the transfer belt is charged and the transfer efficiency is reduced. Therefore,
When performing full color copy mode, the transfer level is updated to a higher value in sequence for each transfer.

That is, counter CN4. When the value of is 3 or less, when the transfer start timing (#1 transfer timing) of the first image forming system comes during execution of the copy processing loop, in full color copy mode (RA=0).

The transcription level corresponding to the value of counter CN41, that is, counter CN4. When the value is 1, the reference transfer level of the first image forming system is set, when it is 2, a higher predetermined transfer level is set, and when it is 3, an even higher predetermined transfer level is set; ≠0), the reference transfer level of the first image forming system is set; the high voltage electric current [110] is instructed to energize the first transfer charger 17.

After further time passes, when the transfer end timing of the first image forming system (#1 transfer end timing) is reached, the high voltage power supply 110
instructs to de-energize the first transfer charger 17,
Increment N41 by 1 (+1).

Also, in the "transcription control" subroutine, the counter C
When the value of N42 is 3 or less, the full color copy mode (RA=
In O), the transfer level corresponding to the value of the counter CN42, that is, when the value of the counter CN42 is 1, the reference transfer level of the second image forming system is set, and when the value of the counter CN42 is 2, the predetermined transfer level higher than that is set to 3. , set a higher predetermined transfer level; in monochrome copy mode (RA; l!O),
Set the reference transfer level of the second image forming system; high voltage power supply 11
0 to instruct the second transfer charger 17 to be energized.

After further time passes, when the transfer end timing of the second image forming system (#2 transfer end timing) is reached, the high voltage power supply 110
Then, the second transfer charger 17 is instructed to be deenergized, and the counter CN42 is incremented by one (+1).

The "recording control" subroutine will be explained with reference to FIG.

In this case, in the copy processing loop, when the paper feed timing comes, the drive of the paper feed roller 41 is instructed and the recording paper is fed to the registration rollers 42; when the registration timing comes, the drive bias of the registration roller 42 is instructed. ; When the recording timing comes, the third transfer charger 43 is instructed to be energized to transfer the toner image on the transfer belt to the recording paper.

At this time.

Although not shown, the energization of the static elimination chargers 33a and 33b is changed at a predetermined timing to perform static elimination before transfer.

Thereafter, when the recording end timing is reached, an instruction is given to drive the registration roller 42 and to de-energize the third transfer charger 43.

When setting the number of copies for multiple copies (repeat), repeat the above steps until the number of copies to be made matches the set number of copies.

In the apparatus of this embodiment, each element of the first imaging system and the first optical system, and each element of the second imaging system and the second optical system,
Since the processes of latent latent image formation, development, and transfer are executed respectively, one drive of the slider 1 can substantially generate two images.
The process is executed once. Therefore, the processing speed when creating a copy with improved image quality by superimposing images with two different OD-ID characteristics (curves a and b) becomes faster. In particular, if the distance between the first photoreceptor drum 10 and the second photoreceptor drum 20 is set appropriately, each image can be formed with a slight time delay, thereby further increasing the processing speed.

It should be noted that although the copying apparatus driven by the document table has been described as one embodiment, the present invention is not intended to be limited thereto. For example, a laser recording device that reads an original image, digitizes the read signal, modulates laser light, and records the image is equipped with a buffer memory that delays the digitized read signal, and the second image forming system is equipped with a buffer memory that delays the digitized read signal. The image formation by the first image formation system may be delayed, and the respective images may be superimposed on the transfer medium.

Furthermore, in the case where it can be applied to a copying machine with a fixed manuscript table, two sets of optical scanners each having nine movable mirrors and corresponding image forming systems similar to those described above may be installed.
For example, after finishing scanning with one optical scanner, move the leading edge of the document to the scanning start position of the other,
Scanning is performed using the optical scanner.

Alternatively, it can be applied to a copying device that combines a moving original platen type and a fixed original platen type, with one having a fixed optical system and imaging system, and the other having an optical scanner and imaging system with a movable mirror. For example, the document table is driven to create an image using one optical system and imaging system, and when the leading edge of the document reaches the scanning start position of the other system, the document table is stopped and optical scanning is performed to create an image. Create.

According to these two application examples, at least in each system, the time from the end of exposure until the exposure start portion of the photoreceptor drum is set at the exposure position can be shortened.

This results in a considerable reduction in time when a total of six images are superimposed as in the full color copy mode of the above embodiment.

Further, in the above embodiment, the first photoreceptor drum 10 and the second photoreceptor drum 20 having different characteristics are used, and the exposure level of the first optical system, the charging level of the first image forming system, and the first
The developing bias of the image forming system, the exposure level of the second optical system, the second
By changing the charging level of the imaging system and the developing bias of the second imaging system, the ○D-I of the recorded image on the first imaging system side is changed.
There is a difference between the D characteristic and the ○D-ID characteristic of the recorded image on the second image forming system side. (distance to the doctor), number of rotations of the developing roller, etc.
Differences in the 0D-ID characteristics may be created by changing known factors that change the ID characteristics, or by adding these factors to those described above. Furthermore, the exposure level may be adjusted by providing an aperture in the optical system.

(2) As described in detail of the invention, according to the electrostatic transfer recording device of the present invention, a charge carrier and a charging means are provided.

Since it is equipped with two sets of image forming means, including an electrostatic latent image forming means and a developing means, it is possible to focus on the reproducibility of the density of the visible image corresponding to the low density part of the original image at almost the same time. It can form a visible image and a visible image that emphasizes the reproducibility of the density of the visible image corresponding to the high-density portion of the original image, and is almost completely different from conventional recording devices that do not perform superimposition. The quality of recorded images can be improved with minimal recording processing time.

In addition, by changing the parameters for controlling the $electrode means, the electrostatic latent image forming means, and/or the developing means for each image forming means, it is possible to not only impart different 0D-ID characteristics to each image forming means, but also to By changing the physical characteristics such as the distance between the charge carrier and the charging means, the distance between the charge carrier and the developing means, or the angle, different OD-IDs can be applied to each image forming means. Characteristics can be given.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an outline of the mechanism of a color copying apparatus according to an embodiment. Figures 2a, 2b, and 2c are graphs showing the relationship between original density and copy density when the developing bias voltage, exposure amount, and i-voltage are changed, respectively, and Figure 2d is the original in overlapping copying. 3 is a graph showing the relationship between density and copy density. FIG. 3 is a block diagram showing the electrical circuit configuration of the device shown in FIG. 1. 4a and 4b show the operation and display board 200 and color balance setting board 300 of the device shown in FIG.
FIG. FIG. 5 is a timing chart showing an example of the operation of the apparatus shown in FIG. Figure 6, Figure 7a, Figure 7b, Figure 7c, Figure 7d, Figure 8, Figure 9, Figure 10, Figure 11, Figure 12, Figure 13.
14 are flowcharts showing, by way of example, a schematic operation of the apparatus shown in FIG. 1. Figure 15 shows the RAM 103 and NRA shown in Figure 3.
This is a memory map showing a part of the allocation of each memory of M104. 1: Slider 2: Contact glass 3: Pressure plate 4: First slit 5: Second slit 10: First @
Light drum (first charge carrier) 11: Exposure lamp
12a, 12b: Mirror 13: Color separation filter (color separation means) LNI: In-mirror lens 1.4, 11, 12a, 12b, LNI, 13:
(First electrostatic latent image forming means) 14: Charger (first ?jF electric means) 15: Eraser 16y, 16m, 16c: Developing unit (first developing means) 17: First transfer charger 18: Cleaner 19: Static elimination charger 1.4
, 11, 12a, 12b, LNI, 13, 14, 16y
, 16m, 16c: (first image forming means) 20: second photosensitive drum (second charge carrier) 21: exposure lamp 22a, 22b: mirror 23: color separation filter (color separation means) LN2: in-mirror Lenses 1.5, 21, 22a, 22b, LN2, 23:
(Second electrostatic latent image forming means) 24: Charging charger (second charging means) 25: Eraser 26y, 26m, 26c: Developing unit (second developing means) 27: Second transfer charger 28: Cleaner 29: Discharge charger 1.5
, 21, 22a, 22b, LN2, 23, 24, 26y
, 26m, 26c: (Second image forming means) 30: Transfer belt (transfer belt) 31.32: Conductor roller 20: Transfer drum 33a, 33b: Static elimination charger 40: Paper feed tray 41: Paper feed roller 42 resist Roller 43: Third transfer charger 17, 27, 30, 43: (transfer means) 44: Conveyor belt 50: Fixing unit 51: Fixing roller 52: Paper discharge roller 60: Paper discharge tray 100: Main control board (control means, Storage means) 101:
Microprocessor 102: ROM 103: R
AM104: Nonvolatile memory Btt: Battery 10
5.106, 107, 108: Input/output interface circuit 110: High voltage power supply 111: Lamp regulator 120: High voltage power supply 121: Lamp regulator 131 resist detection sensor 132: Paper end sensor 133: Paper size sensor 140: High voltage power supply 150: AC power supply 151.1
52: Fan motor 153: Main motor PG: Rotary encoder 160: Signal processing circuit 170: Other driver & detection circuits Patent applicant Ricoh Co., Ltd. Asho 15 figures

Claims (10)

[Claims] (1) First charge carrier; First charging means that charges the first charge carrier; First charge carrier that forms a first electrostatic latent image corresponding to the original image on the charged first charge carrier a first image forming means comprising an electrostatic latent image forming means; and a first developing means for visualizing the first electrostatic latent image formed on the first charge carrier; a second charge carrier; a second charging means for charging the second charge carrier; a second electrostatic latent image forming means for forming a second electrostatic latent image corresponding to the original image on the charged second charge carrier; 2. A second developing means for visualizing the second electrostatic latent image formed on the charge carrier; a transfer means for transferring the visible image in an overlapping manner; and a first image forming means to form a first visible image having high reproducibility of the density of the visible image corresponding to a low density part of the original image. , the second image forming means forms a second visible image with high reproducibility of the density of the visible image corresponding to the high density part of the original image, and the transfer control means forms the first visible image and the first visible image. An electrostatic transfer type recording apparatus comprising: a control means for superimposing two visible images on a predetermined transfer medium; (2) The control means is a parameter for controlling at least one of the first charging means, the first electrostatic latent image forming means, and the first developing means, and corresponds to a low-density portion of the original image. a first parameter for increasing the reproducibility of the density of the visible image; and a parameter for controlling at least one of the second charging means, the second electrostatic latent image forming means, and the second developing means. a second parameter for increasing the reproducibility of the density of the visible image corresponding to a high-density portion of the original image; means, controlling the first electrostatic latent image forming means and the first developing means, and controlling the second charging means, the second electrostatic latent image forming means and the second developing means based on the second parameter. Claims No. (
1) The electrostatic transfer recording device described in item 1). (3) The first electrostatic latent image forming means is a first exposure static eliminating means that irradiates the charged first charge carrier with an optical signal corresponding to the original image to expose and neutralize the charge carrier. and the second electrostatic latent image forming means is a second exposure charge eliminating means for irradiating an optical signal corresponding to the original image onto the charged second charge carrier to expose and eliminate charge on the charge carrier. An electrostatic transfer type recording device according to claim (1). (4) The first electrostatic latent image forming means has a first color separation means for separating the original image into a plurality of color components; the second electrostatic latent image forming means has a first color separation means for separating the original image into a plurality of color components; a second color separating means for separating; a first developing means having a developer of a color corresponding to each color component; a second developing means having a developer of a color corresponding to each color component; Said claim No. 3
) The electrostatic transfer recording device described in item 1. (5) the control means forms a first electrostatic latent image corresponding to one of the color components of the original image on the charged first charge carrier;
The electrostatic latent image is visualized with a developer corresponding to one of the color components; one of the color components of the original image is deposited on a charged second charge carrier.
A second electrostatic latent image corresponding to one of the color components is formed, and the electrostatic latent image is visualized with a developer corresponding to one of the color components. Transfer type recording device. (6) The imaging surfaces of the first charge carrier and the second charge carrier move at equal speeds, and the transfer means comprises a dielectric transfer belt whose transfer surfaces move at equal speeds. The electrostatic transfer recording device according to scope (5). (7) The electrostatic transfer recording device according to claim (6), wherein the first charge carrier is provided upstream of the second charge carrier. (8) the control means causes a first electrostatic latent image corresponding to one of the color components of the original image to be formed on the charged first charge carrier;
making the electrostatic latent image visible with a developer corresponding to one of the color components; and after a predetermined delay, depositing the electrostatic latent image on a charged second charge carrier corresponding to a color component equal to said color component of the original image; The electrostatic transfer type recording according to claim (7), wherein a second electrostatic latent image is formed, and the electrostatic latent image is made visible with a developer corresponding to one of the color components. Device. (9) The plurality of color components are a yellow color component, a magenta color component, and a cyan color component.
8) The electrostatic transfer recording device described in item 8). (10) The electrostatic transfer recording device according to claim 1, wherein the first charge carrier and the second charge carrier have different characteristics. .