JPS63115763A - Ion flow charge density controller for ion flow generation electrostatic recorder - Google Patents

Abstract

PURPOSE:To enable recording of an image with predetermined density irrespective of variation of temperature, humidity, etc. or aging of electrostatic recording head, by constructing such that drive parameters of the electrostatic head are controlled according to discharge current flowing through a photosensitive member. CONSTITUTION:When a writing head 3 is driven, an electrostatic charge image corresponding to information being added is formed on a photosensitive belt 2 and current corresponding to an ion flow flows from a facing electrode 210 through a resistor R. A control section 40 controls a power source circuit 191 such that the detected voltage of a voltage detecting circuit 181 will be 1V(with 1muA current) so as to bring the electrode voltage of the writing head 5 to a proper level. Since driving voltage of the writing head 5 is set by measuring the charge density directly, an image having constant density can be formed irrespective of variation of temperature, humidity, degradation of head, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an ion flow generation type electrostatic recording device that prevents image density from changing due to changes in temperature, humidity, etc., deterioration of the electrostatic recording head over time, etc. This invention relates to an ion flow charge density control device.

[Conventional technology]

As an electrophotographic copying machine equipped with a conventional ion flow generation type electrostatic recording head, for example, US Pat. No. 4,155,093
There is something shown in the specification of the No. This electrophotographic copying machine includes an exposing means for exposing a photoreceptor to light reflected from an original, a charging means for charging the photoreceptor before exposure, a developing means for developing an electrostatic latent image formed by exposure with toner, and a toner image. It has a transfer means etc. around the photoreceptor drum for transferring the image to the recording medium, and in addition to these means, it generates an ion flow according to the image signal read from the image memory etc. to transfer the image to the photoreceptor drum. an ion flow generating means for forming an electrostatic latent image (hereinafter referred to as an electrostatic latent image to distinguish it from an electrostatic latent image based on exposure), and an ion flow generating means for forming an electrostatic latent image based on exposure as necessary. It has a static eliminating means for erasing the image.

In the above configuration, a document is placed on the document table, and
For example, company name, date, etc. to be added to copies of this manuscript content.
When you specify image information such as a department (hereinafter referred to as additional information) from the console panel and turn on the start button, an electrostatic latent image based on the exposure means and an electrostatic charge image based on the ion flow generation means are created on the photoreceptor drum. is formed, which is developed by a developing means and then transferred to a recording medium by a transfer means, and when the transferred image is fixed on the recording medium, a record having a copy corresponding to the original content and an additional information image is obtained on the recording medium. It will be done.

[Problem that the invention seeks to solve]

However, with conventional ion flow generation type electrostatic recording heads, the charge density of the ion flow changes due to changes in temperature, humidity, etc. or deterioration over time, so even if the head is driven under the same conditions, the electrostatic latent image There is an inconvenience that the potential of the image changes and the image density varies.

[Means for solving problems]

The present invention has been made in view of the above, and even if there are changes in temperature, humidity, etc. or deterioration of the electrostatic recording head over time, a discharge current flowing through the photoconductor is used to record an image at a predetermined density. An object of the present invention is to provide an ion flow charge density control device for an ion flow generation type electrostatic recording device, which controls driving parameters of an electrostatic recording head according to the ion flow generation type electrostatic recording device.

According to the ion flow charge density control device of the ion flow generation type electrostatic recording device of the present invention, the photoreceptor is grounded with a resistor having a predetermined resistance value, and the photoreceptor is irradiated with the illumination means while the photoreceptor is stopped. The photoreceptor is made electrically conductive, and the discharge current flowing through the photoreceptor due to the ion flow generated by the electrostatic recording head is detected based on the terminal voltage of the resistor. Driving parameters for obtaining a predetermined ion flow charge density are calculated based on the detected discharge current, and the electrostatic recording head is driven using these driving parameters in subsequent operations. For example, this measurement and calculation operation is performed during the cent-up cycle (initialization) when the power is turned on, and the result is 1? It may be stored in AM, etc. At this time, since the photoreceptor is stationary, there is no intervention of current varying elements, and therefore accurate results are obtained. Even with such control, if a predetermined ion flow charge density cannot be obtained, it may be determined that the electrostatic recording head has reached the end of its lifespan, and a fail message may be displayed on the display section.

Hereinafter, the ion flow charge density control device of the ion flow generation type electrostatic recording device of the present invention will be explained in detail.

〔Example〕

(11) Figure 1 of this system shows an electronic copying machine equipped with an ion flow generation type electrostatic recording gutter (hereinafter simply referred to as a writing head), which produces an electrostatic latent image and an electrostatic charge image in the main body 1. A charge corotron 3 is provided around the photoreceptor belt 2 to charge the photoreceptor belt 2 before forming an electrostatic latent image.
A partial static elimination lamp 4 that partially erases the electrostatic latent image on the photoreceptor belt 2; a writing head 5 that applies an ion flow to the photoreceptor belt 2 to form an electrostatic latent image; A developing device 6 that develops a latent image and an electrostatic charge image, a transfer corotron 7 that transfers the toner image on the photoreceptor belt 2 to recording paper, and a butt roller that facilitates the separation of the recording paper from the photoreceptor belt 2. A tron 8, a pre-clean corotron 9 for neutralizing the electric charge on the photoreceptor belt 2, and a cleaner 10 for cleaning the photoreceptor belt 2 are provided. Above the exposure area of the photoreceptor belt 2, the original is placed ii3! ! A platen glass 11 is provided below which a lamp 1 is mounted.
A lens 13 is provided that exposes the photoreceptor belt 2 to light reflected from the document irradiated by the photoreceptor belt 2 .

Inside one side of the main body 1 is a paper feed tray 1 that supplies recording paper.
4, above which is provided a duplex tray 15 for double-sided copying, further above which:
A discharge tray 16 is provided to receive recording paper.

A conveyance path 17 is provided between the paper feed tray 14 and the transfer area, and a conveyance path 18 is provided downstream of the transfer area, and the conveyance path 18 communicates with a fixing device 19 . A conveyance path 20 is provided downstream of the fixing device 19, including a path leading to an inverter 21 that reverses the recording paper and discharges it onto the duplex tray 15, and a path that leads to the output tray 16 or the duplex tray 15 without reversing the recording paper. The discharge passage is branched into two passages.

A sorter 23 that receives recording sheets from a conveyance path 22 located above the duplex tray 15 is provided outside the main body 1 .

FIGS. 2(al) and (b) show the above-mentioned writing head 5,
Basically, the drive electrode 31 is driven by a high frequency voltage of, for example, 11411z, 3KV (peak to peak), and the drive electrode 31 is turned on or off (for example, -1
200 V DC voltage), the control electrode 32 is turned off (for example, -800 V DC voltage), for example, -toooo
The photoreceptor belt 2 has a screen electrode 33 to which a DC voltage of v is applied to reduce the influence of electric charges on the photoreceptor belt 2. An insulator 3 is provided on the surface or gap of each child type 31, 32, 33.
4,35,36 are provided, the control electrode 32 has an ion guide hole 32a, and the screen electrode 33 has an ion discharge hole 33a'. In FIG. 2 (al), 37 is a high voltage power source that drives the drive electrode 31, 38 is a high voltage power source that drives the control electrode 33, 39 is a high voltage power source that drives the screen electrode 32, and 40 is a high voltage power source that drives the high voltage power source 38. A control unit 41 that controls according to a signal is a potential sensor that detects the surface potential of the photoreceptor belt 2 and inputs it to the control unit 40. Here, the ion guide hole 32a of the control electrode 32
The ion emitting holes 33a of the screen electrode 33 are formed at a density of, for example, 240 dots/inch in the main scanning direction.

FIG. 3 shows the above-mentioned partial static elimination lamp 4, which includes a signal electrode 51 whose at least tip portions (arranged in an array) 50 are transparent electrodes, and a tip portion 50 of the signal electrode 51.
and a common electrode (not shown) having light emitting diodes (arranged in an array) between them, and selectively applying a voltage to the signal electrode 51 causes the light emitting diode array to partially emit light. Can be done.

FIG. 4 shows a control section 40 that controls the control electrodes 32 of the write head 5 described above according to a write signal, and a control section 40 that controls the write head 5 under control of the system control section of the electronic copying machine.
It has PU61. This CPU 61 is connected to its input side with the aforementioned potential sensor 41 and a selection key circuit 62 that outputs a key signal (described later), and on its output side is a character generator (which stores a predetermined character pattern). ROM) 63, a memory (RAM) 64 that temporarily stores an image signal based on a pattern generated from the character generator (ROM) 63 as specified by the CPU 61, and an image of the memory (RAM) 64 or an image memory 67 to be described later. a pattern generator 65 that generates a predetermined pattern signal based on the signal;
A display 66 that displays the input contents of the selection key circuit 62 and an image memory 67 that stores predetermined images (including sentences, etc.) are connected. This pattern generator 65 includes a control electrode driver 6 that controls the control electrodes 32 of the recording head 5 based on the write signal to be outputted.
8, and outputs the above-mentioned voltage from the high voltage power supply 38 based on whether it is on or off.

FIG. 5 shows a selection key provided on the console panel 70, which causes the selection key circuit 62 to output a predetermined key signal. As is clear from the illustration, these selection keys are the company name key, date key, department key, floor key, network pattern key, [phase] key, memory key, number key, alpha vent key, space (SPACE) key, and execution key. (E
NTER) key, etc.

In the above configuration, the operation will be explained as follows.

First, place the original on the platen glass 11 using the i! 2, and then manually input additional information by operating a predetermined selection key from the console panel 70. As additional information, for example, “
Enter "Fuji Xerox system" from the "company name 1" key, enter the [phase] mark from the 0 key, enter rs from the date key, enter 61.9.8J, and turn on the enter key to enter the character generator (ROM). From 63, the figure pattern of [phase] and the character pattern of rs, 61.9.8J are generated and temporarily stored in the memory (RAM) 64, and the fixed phrase "Fuji Xerox" stored in the image memory 67 is generated. ■" address is specified. At the same time, the user inputs the copy area of the additional information on the recording paper using the numeric keys. This input may be performed using a tablet or the like.

Here, when the start button is pressed to issue a copy command, the photoreceptor belt 2 rotates and receives a predetermined charge in the charge corotron 3.

On the other hand, when the lamp 12 is turned on and illuminates the document on the platen glass 11, the photoreceptor belt 2 is exposed to light reflected through the lens 13, and an electrostatic latent image is formed on its surface. When the area on which the electrostatic latent image has been formed passes through the partial static elimination lamp 4, the signal electrode 51 is moved according to the area where the additional information is copied.
is driven to light up the light emitting diode, and the area of the photoreceptor belt 2 corresponding to that area is irradiated to eliminate static electricity. When this charge-eliminated area passes the write head 5, the memory (
RAM) 64 and image memory 67 at a predetermined address are read out as an image signal, and after being converted into a write signal by a pattern generator 65, a corresponding control electrode 3 of the write head 5 is output by a control electrode driver 68.
2 to 1200V (on) or -800V (
Apply a DC voltage (off).

At this time, the drive electrode 31 generates ions (2) and (e) by applying the high frequency high voltage described above, and a DC voltage of -1000V is applied to the screen electrode 33. Therefore, when the control electrode 32 is turned on, the ion flow of θ is transmitted from the ion guide hole 32a to the ion release hole 33a.
is generated toward the photoreceptor belt 2 through +j+]?
'[I+] When the 74 pole 32 is turned off, O ions are not ejected from the ion ejection hole 33a but are confined within the write head 5. As a result, an electrostatic charge image corresponding to the control electrode 320 being turned on is formed in the above-mentioned static elimination region.

In this way, the electrostatic latent image and the electrostatic charge image formed on the photoreceptor belt 2 are developed with toner by the developing device 6. As the toner image on the photoreceptor belt 2 advances to the transfer area of the transfer corotron 7, a recording paper of a predetermined size fed from one of the paper feed trays 14 advances along the conveyance path 17, while being registered. , enters the transfer area and receives the transfer of the toner image on the photoreceptor belt 2 by the transfer corotron 7. The recording paper on which the toner image has been transferred is peeled off from the photoreceptor belt 2 by a corotron 8, reaches a fixing device 19 via a conveyance path 18, undergoes a fixing process, and is discharged from a conveyance path 20 to an output tray 16. be done.

FIG. 6(a) shows a recording paper 71 that has received such a record, and additional information 71a such as the company name, [phase] mark, and date is shown at the top.
It has a copy area 71b below it that corresponds to the content of the document.

FIG. 6(bl) shows a recording paper 71c having a copy 71c of a letter corresponding to the content of the original and a checkered pattern 71d overwritten by the writing head 5; FIG.
C) shows a recording paper 71 having an English letter 71e recorded by the writing head 5 functioning as a printer.

Fig. 6 (Al is a diagram in which additional information is written in a predetermined area that has been neutralized by the partial static elimination lamp 4;
bl is one that has been aged without performing any static elimination operation.

As is clear from the above explanation, it is possible to transfer the copy image and the additional information image in a single transfer operation, which improves the recording speed and completely takes into account fluctuations in the relative position of the two images due to overwriting. There's no need to.

Figure 7 shows two developing machines 6A in the electronic copying machine shown in Figure 1.
and 6B.

Here, since the same parts are indicated by the same reference numerals, a duplicate explanation will be omitted, but the developing device 6A is one that develops an electrostatic charge image of -280V, for example, formed by the writing head 5. The bias voltage is, for example, -5OV, and the developing device 6B is for developing an electrostatic latent image of, for example, -700V formed by exposure based on document scanning, and the bias voltage is, for example, -300V. . Also,
In Figure 1, a flash type exposure device was used.
Here, the difference is that a moving optical system consisting of a lamp 12, a lens 13, a reflecting mirror, etc. is used, and the transport route of the recording paper is different, but the explanation will be omitted here. Note that 7A in the mouth is a pre-transfer corotron, and 4 is a static elimination lamp, so there is no need for partial static elimination.

In the above configuration, the operation will be explained as follows. First, after static electricity is removed from the photoreceptor belt 2 by the static elimination lamp 4, an electrostatic charge image of -280V additional information is formed by the writing head 5°.

This electrostatic charge image is developed with red toner by a developing device 6A with a bias voltage of 150V. Next, the photoreceptor belt 2
After being charged to -700V by the charge corotron 3, an electrostatic latent image corresponding to the document content is formed on the platen glass 1 by a moving optical system having a lamp 12, a lens 13, etc. Developed with black toner using a 300v developing machine 6B. The two-color toner image formed on the photoreceptor belt 2 in this way is pre-printed.
After being subjected to pre-transfer processing by the transfer corotron 7A, it is transferred to recording paper by the transfer corotron 7.

The recording paper carrying the transferred image is peeled off from the photoreceptor belt 2 by a corotron 8 and reaches a fixed stylus 19 via a conveyance path 18, where it undergoes a fixing process and is then ejected to an ejection tray 16. .

In the above description, development was performed using red toner in the developing device 6A, but development □ may be performed using black toner or other toner.

As is clear from the above explanation, before forming a copy image, an electrostatic charge image of additional information is formed and developed, and the additional information image and the copy image are transferred in one transfer operation. Therefore, it is possible to improve the recording speed.

Further, since the electrostatic charge image of the additional information and the copying sieve TLWt image are developed with a bias voltage corresponding to their potentials, they can be developed with the same density.

(2) Inspection of flatness accuracy of this belt Figure 8 shows an enlarged view of the part where an electrostatic charge image is formed on the photoreceptor belt 2 by the writing head 5. Photoconductor belt 2 that moves endlessly in a clockwise direction
is supported by a plate 80 extending across the width from the back surface of the write head 5 in the area where the write head 5 is located. In the figure, 4 is a partial static elimination lamp, and 6
is a developing machine.

As in the above configuration, since the photoreceptor belt 2 is pressed by the plate 80 from the back side, the photoreceptor belt 2 is pressed against the plate 80 due to the tension of the photoreceptor belt 2.
Thereby, the distance between the writing head 5 and the imaging surface of the photoreceptor belt 2 is maintained constant with high precision. At the same time, the generation of wrinkles on the photoreceptor belt 2 is prevented.

Therefore, it is possible to form an electrostatic charge image that does not cause image blur, blur, or density unevenness.

FIG. 9 shows a unit that holds the plate 80 shown in FIG. 8, in which the plate 80 is fixed to a side plate 81 and a feed roller 8 that moves the photoreceptor belt endlessly.
2.83.84.85 are rotationally supported.

In this way, by supporting the plate 80 and the feed rollers 82 to 85 on the side brake 81 and forming a unit, the configuration can be simplified and the workability of assembly can be improved.

Figure 10 (al) shows a plate 80 with a curved surface, which reduces the contact resistance with the photoreceptor belt 2 and improves the movement characteristics, and Figure 10 (b) shows a plate with a curved surface. 80 is supported by a holder 86 via a spring 87, and even if tension fluctuation occurs in the photoreceptor belt 2, it can be absorbed and prevent local sagging.

(3) Writing head and printing ・Temporarily shown in Figure 11 (al, (b), (C) is the writing head 5 (Figure 2 (a)
)) includes a power supply circuit, drive circuit, etc. printed circuit board 90
This shows the connection part that connects the .

In FIG. 11(a), a card edge connector 91 (described later) is electrically connected and fixed to a printed circuit board (motherboard) 90, and a support plate 94 fixed to a support member 93 is positioned opposite to this. are doing.

The support member 93 supports the screen electrode 33 of the writing head 5.
(FIG. 2(a)) is fixed on the ion emitting surface side,
Support plates 9 placed upright on both sides of the aluminum base material 95
It supports a flexible printed circuit board 96 which is adhered to 4. The flexible printed circuit board 96 is made by printing an electrode pattern 97 on a flexible film such as polyimide, and the support plate 94 that adheres and supports this is made of a glass cloth epoxy laminate with a thickness of about 1.6 + n. It is fixed to the support member 93 with adhesive or screws. The electrode patterns 97 include, for example, 16 patterns for the drive electrode 31 (FIG. 2(a)) of the write head 5, 128 patterns for the control electrode 32 (FIG. 2(a)), and 1 pattern for the screen electrode 33. It consists of a total of 145 patterns. 11th Togo (1) 1L printed circuit board 9
FIG. 11(a) shows a card edge connector 91 having, for example, the aforementioned 145 pins 98 each having a pin tip 98a electrically connected to the pin tip 98a and a contact portion 98b in pressure contact with the electrode pattern 97. ) is shown in an inverted position. As is clear from the illustration, the card edge connector 91 has an opening 99 into which a support plate 94 having a flexible printed circuit board 96 is inserted and fitted. Incidentally, FIG. 11 fc) shows a cross section of a flexible printed circuit 96 having a support member 93, a support plate 94, and an electrode pattern 97, but since it is clear from the illustration, the explanation will be omitted.

As is clear from the above explanation, the electrode connection part is placed 90' away from the ion emitting surface, which saves space, and since the motherboard is connected with a general-purpose card edge connector, it is inexpensive and has a long life. can be expected.

Figure 12 (al, (from bl) Figure 16 (al ~ (e)
1 shows another connection configuration between the write head 5 and the power supply circuit, drive circuit, etc. In FIGS. 12(al and bl), the head mounting case 100 has a head mounting opening 101a and an insertion sling l-101b at the bottom, a guide member 103 for moving the connector housing 102 up and down inside, and a head mounting case 100 on the side. Slit 105 for scraping the attachment/detachment lever 104
is formed.

The connector housing 102 has a connector portion 102a having a pin therein to be connected to a connecting pin, which will be described later, and moves with the attachment/detachment lever 104 by engagement, which will be described later. FIGS. 13(a) and 13(b) show connection pins 10 at the top.
6 and has a mounting plate 107 inserted into the insertion slit 101b of the case 100. FIG. 14(a), crest) shows the state in which the writing head 5 is attached to the head attachment case 100, and the writing head 5 is inserted into the insertion slits 101b at both ends of the mounting plate 107, and the writing head 5 is positioned in the opening 1θ1a. When the attachment/detachment lever 104 is turned counterclockwise, the connector housing 102
is lowered and the connector portion 102a connects with the connecting pin 106.

FIG. 15(a) to FIG. 16(a) to FIG. 16(e) show parts constituting the above-mentioned connection portion. Here, since the same parts are indicated by the same reference numerals, duplicate explanations will be omitted.
A wire harness 109 has a retaining portion 108 that engages with the attachment/detachment lever 104, has an engagement slit 110 that engages with and interlocks with the protrusion 111 of the attachment/detachment lever 104, and draws out the connection between the connector portion 102a and the connection pin 106 to the outside. A new configuration is shown.

As is clear from the above description, since the write head is provided with a substrate having connection pins and a portion of the connector is connected to the connection pins, the write head can be easily attached and detached. Further, the replacement can be performed from the front of the copying machine.

Naturally, it is possible to reduce costs and improve connection reliability.

FIG. 17(a), mountain) indicates the writing head 5 (FIG. 2(a))
A third configuration example of the connection portion of the control board 90 is shown.

A glass epoxy lower circuit board 120 on which an electrode pattern 97 is formed is fixed to a support member 93 (FIG. 11(a)) fixed to the screen electrode 33 (FIG. 2(a)) of the writing head 5. There is.

An aluminum substrate 95 is provided on the circuit board 120, and through holes 97 are formed in electrode patterns 97 located on both sides of the aluminum substrate 95.
a is formed. Above the lower circuit board 120, there is a pin 121 inserted into the through hole 97a,
Further, a glass epoxy upper opening i\i3 board 124 is located to which a card edge connector 123 having a pin 122 connected to this pin 121 is fixed. The card edge connector 123 has an opening 125 and an electrode pattern 126 above it.
A J board 90 is located there. Pin 121 is connected to pin 127 which is soldered to upper circuit board 124 and through hole 9.
It has a spring 129 that forces the tip contact portion 128 inserted into the tip 7a downward.

In the above configuration, the control board 90 is inserted into the opening 125 of the card edge connector 123, and the upper circuit board 1
By inserting the 24 pins 121 into the through holes 97a of the lower circuit board 120, a predetermined electrical connection is achieved.

As is clear from the above explanation, a through hole is provided in the power supply pattern of the write head board (lower circuit board), and a pin having a tip contact portion that is elastically biased downward is inserted into this through hole. Therefore, the electrode pattern on the write head substrate does not peel off or become depressed, and a proper electrical connection can be obtained.

(4) Short Head FIG. 18 shows an electrophotographic copying machine having a short writing head 6, for example, 100 m or less in length in the width direction of the photoreceptor belt 2. The rest of the configuration is the same as that in FIG. 1, so the explanation will be omitted.

With the above configuration, predetermined additional information such as a company name, date, etc. can be recorded in a predetermined area within 100 u from the edge of the recording paper. At this time, the electrostatic latent image in that area may be deleted by the partial static elimination lamp 4;
The electrostatic latent image may be overwritten with an electrostatic charge image by the writing head 5 without operating the electrostatic latent image. Shortening the write head makes it possible to downsize and simplify the drive circuit, thereby reducing costs.

FIG. 19 shows another electrophotographic copying machine having a short writing head, eg, less than 100 mm, the construction corresponding to that of FIG.

In comparison with the electrophotographic copying machine shown in FIG. 7, the difference is that a photoreceptor drum 2 is used instead of the photoreceptor belt, and that a static elimination lamp 4A is used before the charge corotron 3. Other configurations are the same (detailed explanation will be omitted).

20(al) and (b) show a case in which a short writing head 5 is moved in the width direction of the photoreceptor belt 2 (or drum), and the writing head 5 is suspended from a rail 130, and A partial static elimination lamp 4 having a length equal to the width of the photoreceptor belt 2 is fixed on one side of the photoreceptor belt 2. The writing head 5 is fixed to a belt 131, and the belt 131 is connected to the drive roll 1.
32 and idler roll 133.

FIG. 21 shows a control circuit for controlling the movement of the writing head 5, and includes, for example, a position input circuit 140 for inputting a right entry area (address) of additional information using the numerical keys of the console shown in FIG. A recording paper size detection circuit 141 outputs a recording paper size signal in response to a button or a signal from a size sensor that specifies the recording paper size, and a recording paper size detection circuit 141 that outputs a recording paper size signal based on a signal from a button or size sensor that specifies the recording paper size, and detects the movement amount and portion of the writing head 5 based on the writing area and recording paper size. A CPU 142 that calculates the lighting area and lighting timing of the static elimination lamp 4, a drive circuit 143 that outputs a drive signal based on the amount of movement of the writing head 5 to drive the pulse smoke 144, and a CPU 142 that calculates the lighting area and lighting timing of the partial static elimination lamp 4. It has a lamp drive circuit 145 that drives the partial static elimination lamp 4 based on lighting timing.

In the above configuration, the operation will be explained as follows. First, when the operator specifies the content of the additional information, the size of the recording paper, and the recording area of the additional information, the control circuit shown in FIG. Calculations based on the paper size and recording area are performed by the CPU 142. When the photoreceptor belt 2 carrying an electrostatic latent image based on the content of the original passes the partial static elimination lamp 4, the CPU 142 lights up the light emitting diode array to a predetermined width according to the additional information, and Continue it for a limited time. Before the photoreceptor belt 2 having the electrostatic latent image from which predetermined areas have been deleted passes the writing head 5, the CPU
142 drives a pulse motor 144 via a drive circuit 143, and the belt 131 is rotated by rotation of the drive roll 132.
The writing head 5 fixed to is moved to a predetermined position. At this time, when the additional information writing area of the photoreceptor belt 2 passes, an ion flow is generated according to the content of the additional information, and an electrostatic charge image of the additional information is formed in the charge-eliminating area of the photoreceptor belt 2. Thereafter, the writing head 5 returns to the home position, and predetermined recording is performed on the recording paper by developing, transferring, and fixing the electrostatic image.

As is clear from the above description, it is possible to write additional information tTh at any position on the recording paper, regardless of the size of the recording paper, while using a short writing head.

FIG. 22 shows a control circuit for using the short writing head 5 shown in FIGS.
5 is deleted, and on the other hand, an information width generation circuit 146 that generates a signal of the width of image information (length in the main scanning direction) and a position information generation circuit 147 that generates position information of the photoreceptor 1-2.
is added.

In the above configuration, the operation will be explained as follows.

The CPU 142 determines the area 150 corresponding to the recording paper on the photoreceptor heald 2 based on the size signal from the recording paper size detection circuit 1111. At the same time, the position of the write head 5 is determined based on the image information width signal from the information width generation circuit 146. As a result, the pulse motor 144 is driven via the drive circuit 143, and the rotation of the drive roll 132 moves the writing pad 5 fixed to the belt 131 to a position corresponding to the first writing area 151.

Thereafter, the control electrode 32 (not shown) of the write head 5 is turned on and off according to the image information to form an electrostatic charge image in the write area 151. This state is shown in FIG.
from there to the next writing area 152. Thereafter, when the position information generating circuit 147 detects one revolution of the photoreceptor belt 2, image information is recorded in the writing area 152.

This state is shown in FIG. 2(b).

As is clear from the above description, since a short writing head can be used as a printer, versatility can be increased while suppressing cost increases. In this case, a write head that generates an ion flow was used, but by charging the photoreceptor belt in advance and driving a short write head of a light emitting diode array or liquid crystal according to the image information, the electrostatic charge can be reduced. It is also possible to form a latent image.

The electrophotographic copying machine of FIG. 1 will be explained based on the flowchart of FIG. 24. First, the photoreceptor belt 2 is charged by the charge corotron 3, and the platen glass 1 is charged.
It is exposed by the light reflected from the original on 1. The electrostatic latent image formed on the photoreceptor belt 2 by exposure has a potential of -700V and is developed by a developing device 6 having a bias voltage controlled to -300V.

The toner image developed in this way is transferred to the transfer corotron 7.
The image is transferred onto the recording paper fed through the conveyance path 17, and then enters the fixing device 19 through the conveyance path 18 where it is fixed.

The fixed recording paper enters the inverter 21 from the conveyance path 20 and is stored in the duplex tray 15 from there.

Because of the force applied, the photoreceptor belt 2 cleaned by the cleaner 10 passes through the charge corotron 3 without being charged, and when the image forming area reaches the position of the writing head 5, the writing head 5 An electrostatic charge image is formed on the photoreceptor belt 2 by being driven in accordance with the additional information. Since this electrostatic charge image has a potential of -280V, the developing device 6 develops the electrostatic charge image based on a bias voltage controlled to -50V. Paper is fed at the timing when this toner image reaches the transfer corotron 7, passes through the conveyance path 7, is registered, and is then transferred by the transfer corotron 7. The recording paper onto which the toner image has been transferred enters a fixing device 19 via a conveyance path 18, and is discharged from a conveyance path 20 to a discharge tray 16.

As is clear from the above explanation, even if the potential of the electrostatic latent image due to ion absorption is lower than the potential of the electrostatic latent image of the copying machine because the amount of charge per unit time is smaller than that of the charge corotron 3. By controlling the bias voltage of the developing device 6 to a predetermined value, it is possible to develop at the same density. This tendency increases as the rotational speed of the photoreceptor belt 2 increases, but it can be counteracted by controlling the bias voltage. Therefore, it is possible to increase the recording speed.

(5, 2) - Control of D'Sk image erasure FIG. 25 shows a lighting control circuit for the partial neutralization lamp 4 (FIG. 3) of the electrophotographic copying machine shown in FIG. 1.

This lighting control circuit includes an area signal generation circuit 160 that generates an area signal in which additional information such as page and date is recorded, and a priority signal generation circuit 161 that outputs a priority signal when the additional information has priority over document information. a size signal generation circuit 162 that generates a recording paper size signal; a timing signal generation circuit 163 that generates a recording paper conveyance timing signal;
A gate circuit 164 that receives an area signal and a priority signal as input, a size signal, a transport timing signal, and a gate circuit 1
It has a gate circuit 165 which inputs the output signal of No. 64. The gate circuit 165 is a control unit 166 centered on the CPU.
The control unit 166 is connected to the decoder driver 167
It is connected to the. The decoder driver 167 applies a power supply voltage Vc to each divided group of the light emitting diode array 168.
It is connected to a transistor 169 that applies c and a transistor 170 that simultaneously grounds the corresponding transistors between each group.

The operation of the above tank bottom will be explained based on the flowchart of FIG. 26 as follows. When the operator selects the content of additional information, area designation, priority designation of additional information, recording paper size, etc. from the console panel, the information is input to the control unit 166 via gates 164 and 165. The control unit 166 processes this information using a predetermined program and temporarily stores the results in internal RAM. - After an electrostatic latent image is formed on the charged photoreceptor belt 2 based on document scanning, when that area passes the partial static elimination lamp 4, the control unit 166 selects [? A control signal is outputted to neutralize the area where the additional information image is formed based on the contents stored in the AM. When the decoder driver 167 inputs this constraint ' If an electrostatic latent image is formed as a black image in the corresponding area, it is erased.After that, when that area passes through the writing head 5, an electrostatic latent image corresponding to the additional information is formed. .

In the above explanation, the partial static elimination lamp 4 has been used to eliminate static electricity in the area where additional information is formed, but it is also possible to eliminate static electricity in the margin area other than the image information area, and between multiple images that are formed serially. Can be done. Naturally, instead of the partial static elimination lamp 4, an erasure lamp provided for static elimination may be used.

(5, 3) Sense Right belt power disable mode control No. 27
The figure is a flowchart of this control, and when the writing head 5 shown in FIG. It is a control to utilize. When the control unit 40 receives this control command, +2 is applied to the control electrode 32.
Applying a DC voltage of 00V to the screen electrode 33, Ov
Apply. As a result, the ions (2) and (e) generated by the drive electrode 31 reach the photoreceptor belt 2 through the ion discharge hole 33a, neutralize the charge on the photoreceptor belt 2, and erase the charge. In this case, the control electrode 32 has +200ν
Since a DC voltage of
C ions can be released, and the negatively charged photoreceptor belt 2 can be effectively neutralized.

As is clear from the above explanation, when writing the ion flow,
can be used as a charge erasing means, eliminating the need for an erase lamp and reducing costs. Furthermore, if the user is given the option of replacing the erase lamp with this write head 5 as necessary,
Furthermore, versatility can be improved.

(5, 4) Development - Akigo who removes unevenness from the mold (5, 4,
1) FIG. 28 (al is the variation in the characteristics of the write head 5,
Alternatively, a control circuit is shown that suppresses density unevenness due to variations in the mounting accuracy of the corotron (for example, inclination with respect to the photoreceptor belt 2), and the writing head is positioned with a predetermined gap between the photoreceptor belt 2 supported by the feed roll 83 5 is provided, and a light emitting diode array 180 is provided on the opposite side.
is provided.

The photoreceptor belt 2 has a grounding conductive region 182 on one side, and a grounding sleeve 183 is in contact with this conductive region 182. The earthing sleeve 183 is brought into contact with switches 184 and 185, and the switch 184 is opened and closed with the earth, and when the switch 185 is turned on, it is earthed through the resistance R (for example, IOMΩ).

Voltage detection circuit 181 for detecting the terminal voltage of resistor R
is connected, and the detected value of the voltage detection circuit 181 is input to the control unit 400 CPU after digital conversion. The control section 40 has this CPU, a program ROM, an RA gate for temporarily storing data, etc., and a non-volatile RAM for storing a set voltage, which will be described later. (al, (bl), control electrode 32
(Fig. 2 (al, (b)) and the screen electrode 33 (
Figure 2: Power supply 3 that applies the above-mentioned set voltage to [a), 伽))
7, 38, and 39, and the control electrode power supply 38 applies the aforementioned set voltage to each of the 12 divided control electrodes 32 (FIG. 2), for example, via the divided drive circuit 186. The writing head 5 has a length of 24 mm for A4 size, for example.
0SPI, 2796 dots are used,
233 dots are assigned to each division unit by 12 divisions.

In the following explanation, only the control electrode 32 is divided into 12 parts to perform divided drive control, but normally six drive electrodes 31 (FIG. 2(b)) and a single screen electrode 33 are arranged in a row. It may also be divided into 12 parts and driven separately.

In the above configuration, with the light emitting diode array 180 turned on and the photoreceptor belt 2 made conductive, a voltage of Vo"3KV (IMHz), Suff')- is applied to the drive electrode 31.
33" Vs = -1000V (QC) is applied to each divided unit 1.2 of the control electrode 32 from the control electrode power source 38 via the divided drive circuit 186.
...A negative DC voltage is sequentially applied to the 12 groups of 12. In each divided unit, the control electrode voltage is set to -1000 V so that the current flowing through the resistor R becomes 10 μA (terminal voltage IV of the resistor R) based on the output of the voltage detection circuit 181.
The voltage is controlled within a range of -1,500 V from 1 to 1,500 V, and that voltage is stored in a nonvolatile RAM as a set voltage for subsequent operations.

(in FIG. 28) indicates the set voltage stored in the nonvolatile RAM.

This operation is performed at the time of factory shipment or during service mode. In normal copying operations, switch 184 is turned on, switch 185 is turned off, and write head 5 is controlled based on the set voltage stored in the nonvolatile RAM. In the above description, only the control electrode voltage was controlled, but the drive electrode voltage or the screen electrode voltage may also be controlled.

As is clear from the above explanation, since the drive voltage is divided and controlled so that the ion flow is constant throughout the write head, even if the installation accuracy of the recessed head varies, unevenness in the developed density due to uneven charging can be avoided. This also eliminates the uneven development density due to variations in the characteristics of the rotating head in the longitudinal direction.

Figure 28 (Al's control system controls changes in temperature and humidity,
It may be used to suppress fluctuations in charge density due to aging of the write head 5.

In this case, there is no need to drive the write head 5 in parts. Here, the resistor R is set to IKΩ, and the voltage of the control voltage 32 is controlled so that the output of the voltage detection circuit 181 becomes 10 V (current value is 1 mA).

Voltage control ranges from -600V to -1500V.
It is sufficient if the detection voltage is a value of IOV±5% with 0V step control.

(5, 4, 2) Fig. 29 shows a method for suppressing fluctuations in the surface potential of an electrostatic image due to changes in temperature and humidity, deterioration of the sensitive material, deterioration of the writing head, etc. A surface potential measurement area 2B with a width of 20 mm is provided on one side of the photoreceptor belt 2.

This photoreceptor belt 2 is supported by a feed roll 83, and a potential sensor 190 is placed opposite the surface potential measurement area 2B.
is provided. The writing head 5 has a length of 340mm so that it can print A4 horizontal size, and the portion corresponding to the surface potential measurement area 2B generates an ion flow regardless of the information to be written. The potential sensor 190 is connected to the control unit 40, and the control unit 40 has a configuration for controlling the power supply circuit 191 of the write head 5 and the bias voltage of the developing device 6.

In the above configuration, when the writing head 5 starts forming an electrostatic charge image of additional information, or prior to that, the surface potential measurement area 2B is charged, and the potential sensor 190 measures the charged potential. The control unit 40 is a potential sensor 190
The output is compared with a reference value previously stored inside, and the power supply circuit 191 is controlled based on the deviation to control the electrodes (drive, control, and screen electrodes, or one or two of them) of the writing head 5. control the voltage applied to the In addition to or in place of this, the bias voltage of the developing device 6 is controlled.

(5, 4, 3) FIG. 30 shows the replacement of the write hood 5 due to deterioration and the stop of the recessing operation by the 6-inclusion head 5. The photoreceptor belt 2 supported by the feed roll 83 A potential sensor 190 is provided to measure the surface potential of an electrostatic image formed by the writing head 5.
The potential sensor 190 is connected to a comparator 200 that compares it with a first level El and a comparator 201 that compares it with a second level E2 (El>El). Comparators 200 and 201 are connected to the control unit 40 and control <'
The In section 40 is connected to a replacement indicating diode 204 or an operation stop indicating diode 205 via boats 202 and 203.

In the above configuration, when an electrostatic charge image of additional information is formed on the photoreceptor belt 2 by the writing head 5, the potential sensor 190 detects its surface potential. In the normal case, the output E of the potential sensor 190 is E > E r , E >
EZ, the control unit 40 uses the light emitting diode 204.
．． 205 is not lit and no stop signal is output. On the other hand, due to deterioration of the write head 5, the surface potential decreases and E
When <El, E>El, the boat 202 outputs a deterioration signal and turns on the transistor, thereby lighting up the light emitting diode 204 and prompting the operator to replace the write head 5. Despite the indication to replace the write head 5,
If the use is continued without replacement, the surface potential will further decrease to E<El, E<EX, and the control unit 40 will turn on both the light emitting diodes 204 and 205 and turn on the write head with a stop signal. Stop the operation.

As is clear from the above explanation, since the deterioration of the write head 5 is displayed, the write head 5 can be replaced before image quality deterioration occurs, and if it is not replaced, the operation is stopped, so the image quality is reduced. It can prevent bad records from being made.

(5, 4, 4) Fig. 31 (al is the one in which the writing head 5 is provided on the photoreceptor belt 2 with a gap of g = 230 μm, and the writing head 5 is connected through the resistor R of IMΩ. It has a grounded counter electrode (for example, a 0.3ml copper plate) 210.The terminal voltage of the resistor R is detected by a voltage detection circuit 181, and the subsequent stage configuration is shown in FIG. 31 (bl shows the configuration of the write head 5 in the part where the counter electrode 210 is located, in the configuration having the drive electrode 310, the control electrode 320, the screen electrode 330, and the insulators 340, 350, 360) corresponds to the configuration in FIG. 2+al.

FIG. 31(C) shows the write head 5, the part to the left of the boundary line A is the part that generates an ion flow toward the above-mentioned counter electrode 210, and the part to the right is the part that generates the ion flow toward the photoreceptor belt 2.
This is an image forming part that generates an ion flow towards the image. Here, the control electrode 320 has a size of 2.5×2.5 cm, and is configured to emit a large amount of ions toward the counter electrode 210 by providing a large number of ion emitting holes.

In the above configuration, when the write head is moved 5'',
An electrostatic charge image corresponding to the additional information is formed on the photoreceptor belt 2, and a current corresponding to the ion flow flows from the counter electrode 210 via the resistor R. The control unit 40 is the voltage detection circuit 18
The power supply circuit 191 is controlled so that the detected voltage value of 1 becomes IV (current value is 1 μA), and the electrode voltage of the write head 5 is set to an appropriate value. At the same time, the bias voltage of the developing device 6 may be controlled.

Here, the distance between the writing head 5 and the photoreceptor belt 2 is 23.
Although it can be attached at a high angle of 1191 degrees of 0 μm±50 μm, since the counter electrode 210 is provided on the outside of the photoreceptor belt 2, the attachment is easy.

As is clear from the above explanation, since the drive voltage of the write head is set by directly measuring the charge density, images with constant density can be formed regardless of changes in temperature, humidity, head deterioration, etc. It can be carried out.

FIG. 32(a) shows a writing pad 5 that forms an electrostatic charge image of additional information on the photoreceptor belt 2 supported by a feed roll 83.
is provided, and heaters 220 are provided on both sides of the write head 5.
is provided.

A temperature sensor (thermistor) 230 is attached to the heater 220, and a temperature sensor (thermistor) close to the heater 220 detects the temperature of the photoreceptor belt 2.
240 are provided. The temperature sensors 230 and 240 are connected to R/V converters 231 and 232 that perform resistance/voltage conversion, and the outputs of the R/V converters 231 and 232 are connected to the control unit 4.
It is set to be input as 0. The control unit 40 performs Jγ processing on the outputs of the R/V converters 231 and 232, and a switching transistor 223 is connected to the output side of the control unit 40 via a port 233. The emitter of the switching transistor 223 is grounded, and the collector is connected to a heater 220 (attached to the I-included radar 5), and the heater 220 is connected to the power supply Vc via a temperature fuse 221. .

FIG. 32(b) shows a contact type temperature sensor using a thermistor, which is installed on the upper part of the heater 220, and is elastically compressed by a chloroprene rubber 253 molded and fixed to a bracket 250, thereby forming a temperature sensor. 230 is connected to the heater 220 via the polyimide tape 252
It has come to be in close contact with Note that 251 is a signal lead wire of the temperature sensor 230.

In the above configuration, when a signal of "1" is output from the control unit 40 to the transistor 223 via the port 233, the transistor 223 is turned on and the heater 220 is activated. The writing head 5 is heated by the operation of the heater 220, and the atmosphere in which the ion flow is generated is dehumidified to suppress a decrease in charge density. Here, the control unit is the temperature sensor 230.2.
From 40 to R
/V converters 231 and 232. At this time, if the temperature of the photoreceptor belt 2 exceeds, for example, 40°C,
Transistor 223 is turned off to stop operation of heater 220. This prevents the photoreceptor belt 2 from losing its light guiding properties due to crystallization. Photoconductivity is at most 4
There is a risk of loss at temperatures between 0 and 60°C. On the other hand, if the temperature of the photoreceptor belt 2 is below a predetermined value, the heater 220 is turned on and off appropriately based on the temperature of the write head 5 to control the temperature within a predetermined range.

FIG. 33 shows a direct conversion of the control unit 40 using a hardware circuit configuration. When the temperature of the heater 220 is low, the resistance value of the temperature sensor 230 becomes large, and the output of the differential amplifier DA becomes large. . The differential amplifier DA inputs a reference voltage to its negative terminal from a parallel circuit of a Zener diode ZD and a capacitor C. When the output becomes large, diode group D
I turns on, turns on the transistor 223, and turns on the heater 22.
Activate 0. When the temperature of the photoreceptor belt 2 increases due to the operation of the heater 220, the resistance value of the temperature sensor 240 decreases, and the output of the differential amplifier DAt decreases. The reference voltage is equal to the reference voltage mentioned above. Differential amplifier OA
, + becomes small, the difference with the output of the differential amplifier DAI becomes large and diode D2 is turned on, so the group of diodes is turned off and the transistor 223 is turned off, causing the heater 220 to operate. stops.

(6,2) f! r ■ [Niji Ota Figure 34 (al is a humidity sensor 255 attached to the screen electrode 33 of the writing pad 5 shown in Figure 2 (a).The humidity sensor 255 is, for example, Figure (b
), (C), after screen-printing a pair of comb-shaped gold electrodes 257 on the alumina substrate 256, a solution of styrene sulfonate, which is a moisture-sensitive material, and a crosslinking agent added thereto is applied to the alumina substrate 256. The moisture sensitive film 258 is formed by coating the film on top and irradiating it with ultraviolet rays to perform crosslinking and polymerization. A protective film 259 is provided on the humidity sensitive film 258, and is of a type that, for example, reduces electrical resistance when humidity increases. Note that 257a is a terminal lead.

FIG. 35 shows a control circuit using this humidity sensor 255, which is composed of a humidity detection circuit . Now, when the humidity increases and the resistance value of the humidity sensor 255 decreases, the output of the differential amplifier DA, which inputs the reference voltage controlled by the Zener diode ZD to its positive terminal, increases. When this output becomes large, the output of the differential amplifier DA becomes large and the transistor Tll! , the emitter output of becomes large,
The primary side voltage of the transformer T increases, and the level of the high frequency voltage applied to the drive electrode 31 of the write node 5 is increased. Furthermore, the transistor Tl? 2. Capacitor C2
, C3, C4, inductance L, etc. constitute a high frequency oscillation circuit.

For example, the heating element pattern 261 is formed on the writing head 5 shown in FIG. 2(a). It is formed on an insulating layer 260 of alumina (AI!zO:+) provided on the electrode 33.As mentioned above, the gap between the writing head 5 and the photoreceptor belt 2 has a high precision of about 230 μm±5 μm. heat generating layer (abrasive layer)
The total thickness of 261 and the insulating layer 260 is preferably 200 μm or less. In addition to alumina and ceramic, the insulating layer 260 is suitably made of a glass glaze mainly composed of SiO□, P, and 0. The heat generating layer 261 is made of a glass glaze mainly composed of SiO□, P, and 0. Insulating/resistive materials used in normal thick film processes, such as , u-Pt, etc., can be used. Note that the heat generating layer 261 may be a sheet resistor formed over the entire surface without being patterned. In this case, ion release holes must be formed on that surface.

As is clear from the above description, since only the narrow gap between the writing head 5 and the photoreceptor belt 2 is heated, it is possible to reduce the power consumption and shorten the warm-up period.

(6, 4) Moisture absorbent FIGS. 37(a) and 37(b) are used to surround the atmosphere with a case 271 when an electrostatic charge image is formed by the writing head 5 on the photoreceptor belt 2 supported by the feed roller 83. death,
A desiccant 274 such as silica gel is enclosed in a case 271 to dehumidify the inside thereof. 273
is a metal plate that fixes the desiccant 274 and is provided with a hole for breathing, and is also a metal plate that fixes the desiccant 274.
A sponge 272 is placed between them to enhance the dehumidification effect inside the case 271. The perforated metal plate 273 may be replaced with a mesh or the like. Note that 4 is a partial static elimination lamp.

In FIG. 38, the photoreceptor belt 2 is replaced with a photoreceptor drum 2, and the same parts are indicated by the same reference numerals, so redundant explanation will be omitted.

As is clear from the above description, since the ion flow generation atmosphere can be dehumidified with a simple structure, ions with a predetermined charge density can be generated without increasing costs.

Further, it is also possible to prevent the writing head 5 from becoming dirty.

(6,5) Plane shavings” ball! (Company) ξ Wind Figure 39 (a) and (bl) are for forcing dry air into the ion flow generating atmosphere. A writing head 5 is provided, and an air duct 284 is positioned to surround the writing head 5.
Dehumidifying filter 2 supported by cover 281 at the tip of 4
82 and a blower fan 283 are provided. 40th
FIG.
A desiccant 274 such as silica gel held by 91 is housed therein. The desiccant 274 is divided into a plurality of parts, and a gap 292 is formed between them.

In the above configuration, when the write head 5 starts writing additional information, the blower fan 283 is driven and blows the air that has passed through the dehumidification filter 282 around the write head 5 . Therefore, the ion generation atmosphere of the write head 5 is dehumidified, and stable ion generation can be obtained.

(6,6) ion °L FIG. 41 shows a write head 5 with a drive electrode 31 and
It is composed of a control electrode 32 having an ion guide hole 32a and a screen electrode 33 having an ion discharge hole 33a. It has a shape.

As described above, since the ion emitting holes are made longer in the process direction, recording speed can be increased without increasing the drive voltage.

〔Effect of the invention〕

As explained above, according to the ion flow charge density control device of the ion flow generation type electrostatic recording device of the present invention, the driving parameters of the electrostatic recording head are controlled according to the discharge current flowing to the photoreceptor. Even if there are changes in temperature, humidity, etc. or deterioration of the electrostatic recording head over time, stable image recording at a predetermined density can be performed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an electrophotographic copying machine equipped with an ion current generating type electrostatic recording head, FIGS. 2(a) and (b) are explanatory diagrams showing an ion current generating type electrostatic recording head, and FIG. The figure is an explanatory diagram showing the partial static elimination lamp, Fig. 4 is a block diagram showing the control system, Fig. 5 is an explanatory diagram showing the console panel, and Fig. 6 Ta), (b),! 01 is an explanatory diagram showing recording on a recording medium, and FIG. 7 is an explanatory diagram showing another electrophotographic copying machine equipped with an ion flow generation type electrostatic recording head. From FIG. 8, FIGS. 10(a) and 10(b) are explanatory diagrams showing the plate and support means for supporting the flexible endless photoreceptor belt, and FIGS. 11(a), (b), and (C) show FIG. 17( a) and (b) are explanatory diagrams showing the connections between the ion current generation type electrostatic recording head, the power supply circuit, and the electrostatic recording head, and Figures 181ffl' and 19 are further ion flow generation type electrostatic recording An explanatory diagram showing an electrophotographic copying machine equipped with a head, from FIGS. 20(a) and (b), FIG. 22 is an explanatory diagram showing a means for moving a short ion flow generating type electrostatic recording head, and FIG. 23 +8), (bl is an explanatory diagram showing the positional relationship between the short ion flow generation type electrostatic recording head and the photoreceptor belt, FIG. 24 is a flowchart of control for recording additional information, and FIG. 25 is an explanatory diagram showing the positional relationship between the short ion flow generation type electrostatic recording head and the photoreceptor belt. Block diagram of a control circuit that erases an electrostatic latent image based on exposure according to the recording area, 2nd
Figure 6 is a flowchart diagram of the control circuit in Figure 25, and Figure 27.
The figure is a flowchart of the control for neutralizing the charge on the photoreceptor belt by the ion flow generation type electrostatic recording head, and Figures 28 (a) and 28 (b) show the control for dividing and driving the ion flow generation type electrostatic recording head. (a) is a block diagram, (b) is an explanatory diagram showing the storage contents of the nonvolatile RAM, and FIGS. Explanatory diagram of the means, Fig. 32 (a), (b)
) and FIG. 33 are explanatory diagrams showing heating and temperature detection means of the ion flow generation type electrostatic recording head, and FIG. 34(a)
, (bl, (C) and FIG. 35 are explanatory diagrams and circuit diagrams showing the humidity detecting means of the additional information recording area and its circuit, and FIGS. 36(a) and (11) are the ion flow generation type electrostatic recording head. An explanatory diagram showing a heater that heats the
, (From BL, Fig. 40 is an explanatory diagram showing means for dehumidifying the recording area of additional information, and Fig. 41 is an explanatory diagram showing an ion flow generation type electrostatic recording head. Explanation of symbols 1--...・・・・・・・・・−・Body 2−・−・・
・・−・・Photoreceptor 3 −−m−−・−・−
−−1−・Charge Corotron 4 ・・・・・・−・・−
・・・−Partial static elimination lamp 5 ・・−・−・−・・・・・
Ion flow generation type electrostatic recording head 6.6A, 6B...
−・・・・・−・−Developing machine 7 ・・・・−・・−・・
・・・・Transfer Corotron 8 ・−・−・・・−・・・
・・・−・Tetasoku Corotron 9 ・・・−・−・−・−
...Pre-cleaning Corotron 10--...
−・・−・')'）−su１１・・・−・・−・・
−・・−Platen glass 12−・・・・・・−・−・・
・-・Lamp 13・・・・・−・−・・・Lens 14−・−・・−・−・・・・・・Paper feed tray 15
・－・・・・・・・・・・・・Duplex tray 1
6-・-・・・・・・・Ejection tray 17.18.
20.22...--m--...--Transportation path 1
9−・−・−・−・−・−・Fuser 21・・・・−・
−・・−・・・・Inverter 23・・・−・・・・
--- Sorter 31 --------- Drive electrode 32
--1----------Control electrode 32a--
−・・−・・・−・・−・Ion guide hole 33−・・・・
−・−・・−Screen electrode 33a 〜・−・−
・-1111-・-・Ion release hole 34.35.36・
−・・−・−・−・Insulator 37・−・・〜・−・・−−
- High frequency power source 38 --- Control electrode power source 39 --- Screen electrode power source 40 --- = ---・−・−・・−Control unit 41・・−・−・・−Potential sensor 70・・−・
−・−・Console panel 71・・−・−・−・・
...-Recording paper 71a, 71d...
・−・−Additional information 71b,? I C--Copy image 71e --- Printer image 80
・－・－・・・・・・・・・・・・7”L/-1-81・
−・・−・・−−−−1−−−−Side plate 82.
83.84.85-・-・・-・・・・・Feed roller 86・・−・−・・・・・・・・Holder 87
・・・・・・・・・−・・Spring 90−−−−−
-1・−・Printed board 91.123 ・−・−・・
・・・−・−・−・Card edge connector 93−・−
−1−−・−・・Support member 94−・−・・−・・
・・・・−Support board 96・−・・−・・・・Flexible printed circuit board 97・・・〜・・−−1−−−−−
・Electrode patterns 98 a, 98 b -------
--- Bin 102 --- Connector housing 104 ---- Lever 1
06 -・----------11---- Pin 107
・・・・・−−−１−・−・−Mounting plate 109 −・−
−−−−−−−Wire bar 121 ・−・
−・・・・・・・・−・・Pin 130 ・・−・−・
・・・・・・・・・ Rail 131 ・・・・・・・・・
・・−・−・・Belt 132 ・・−・−・−・
・−・Drive roll 133 − ・−−−111−−～
Idler roll 150 −・・−・・−・・・・−・・
Recording paper size 151.152 . . . Writing head recording area 168 - . 190 -......--Potential sensor 210 -1-------Ion flow detection opposing sensor 220 -...-----
-Heater 230.240 ・−・−・−・・・−・・
・Temperature sensor 255 −−−〜・・・−・−・−・Humidity sensor 256 −・・・・・・・・・・−・−・− Board
257 ・−・−−1−−−・−・−・・Electrode
'na58 −・−・−・−・−・・−・Thermosensitive layer
259−・−・−・−・Protective layer 261 −−1−−・−
・−・−・−Resistance layer 272 〜−−−−−−・−・
・・−Sponge 274 −・−・−・・−・−1−−−
Desiccant 282 --- Dehumidifying filter 28
3−−・・−・−Blower fan 290 ・−・
−・−・−・・−Sponge 291 −−−−−−・−
・−・−Case 310 ・・−・−・−・Drive electrode 320 ・−・・−・・−・−Control electrode 330 −・・−・・・−・−・Screen electrode patent Applicant Fuji Xerox Co., Ltd. Agent Patent Attorney Taira 1) Tadao Figure 2 (a) (b) Figure 3 Figure 4 Figure 8 Figure 9 Figure 10 tσ (b) Factor 11 (b)
(c) Figure 14 (a)
(b) Fig. 15 (a) (b) Fig. 21 Fig. 23 (C) (b) 51A Fig. 26 Fig. 27 ≦ (b Fig. 31 (a) Fig. 31 (b) [- Bottom ( C) Figure 32 fσ; 1.33 Doctor Figure 34 (a) 7.31 (b)
(c) Figure 36 Figure 38 Figure 37 (o) 5 Figure 39 (Q) (b) Figure 41

Claims (6)

[Claims] (1) In an ion flow generation type electrostatic recording device that applies an ion flow to a photoconductor in accordance with an image signal to form an electrostatic latent image, and after developing, transfers and fixes this image to record an image on a recording medium. , an electrostatic recording head that generates an ion flow according to the image signal, an illumination means that makes the photoreceptor photoconductive, and a resistor having a predetermined resistance value that grounds the photoreceptor, An ion flow generation type electrostatic device comprising: a measuring means for measuring a discharge current flowing through the photoreceptor based on a terminal voltage; and a control means for controlling driving of the electrostatic recording head according to the discharge current. Ion flow charge density control device for recording device. (2) The control means drives the illumination means and the electrostatic recording head with the photoreceptor stopped, and drives subsequent operations of the electrostatic recording head based on the discharge current at that time. An ion flow charge density control device for an ion flow generation type electrostatic recording device according to claim 1, which controls the ion flow charge density of an ion flow generation type electrostatic recording device. (3) Ion flow charge density of the ion flow generation type electrostatic recording device according to claim 1, wherein the control means controls the drive voltage of the control electrode of the electrostatic recording head based on the discharge current. Control device. (4) Ion flow generation according to claim 1, wherein the control means controls the drive frequency of the drive electrode of the electrostatic recording head or the drive voltage of the drive electrode or screen electrode according to the discharge current. Ion flow charge density control device for type electrostatic recording device. (5) The ion flow charge density control device for an ion flow generation type electrostatic recording device according to claim 1, wherein the control means controls the developing bias voltage of the developing means based on the discharge current. (6) The ion flow generation type electrostatic recording device according to claim 1, wherein the illumination means is provided on the opposite side of the electrostatic recording head at a position where the electrostatic recording head is disposed. Ion flow charge density control device.