JPS63168669A - Selective destaticizer for copying machine - Google Patents

Abstract

PURPOSE:To destaticize electrostatic charge with high resolution by using a transmission type electrochromic display element, where plural segments or dots are arranged, and back light as light emitting means which selectively removes the electrostatic charge on the surface of a photosensitive body and constituting segments or dots at a very fine pitch. CONSTITUTION:A transmission type electrochromic display element 70 where plural segments or dots are arranged and back lights 82a-82d constitute light emitting means, and the light of back lights 82a-82d is selectively transmitted to a photosensitive body by the transmission-type electrochromic display element 70 to destaticize the electrostatic charge. Plural segments or dots which selectively allows the light of back light beams 82a-82d to pass through or intercept this light can be arranged in the transmission type electrochromic display element 70 at a pitch finer than the arrangement pitch of a conventional light emitting diode, and the resolution of an area to be destaticized is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a selective static eliminator for a copying machine, which is capable of selectively erasing an image by previously discharging a predetermined area on a photoreceptor.

(b1 Summary of the Invention The selective static eliminator for a copying machine according to the present invention selectively eliminates static electricity from an electrostatic latent image formed on a photoreceptor in an electrostatic electrophotographic copying machine, or eliminates electrostatic latent images formed on a photoreceptor. This invention relates to a copying machine in which a light-emitting means for selectively removing static electricity from a position on a photoreceptor where an image is to be formed is provided between a charging device and a developing device, and a high-resolution display element and a backlight are used as the light-emitting means. This makes it possible to eliminate static electricity in the area to be neutralized with high accuracy.

(C) Prior Art As one of the additional functions of recent copying machines, copying functions such as editing, trimming, masking, centering, or two-color copying using these functions are provided.

When performing such editing operations, a desired area on the document surface is input using a numeric keypad, a tablet, a stylus pen, etc., and in order to selectively eliminate the electrostatic latent image formed on the photoreceptor, 2. Description of the Related Art A light-emitting device is used in which a large number of light-emitting diodes are arranged in a line in a direction perpendicular to the paper conveyance direction, and each light-emitting diode is divided by a partition plate.

(d) Problems to be Solved by the Invention However, in such conventional copying machines, the resolution of the light emitting means for selectively eliminating static latent images is determined by the pitch at which the light emitting diodes are arranged. 2.5 at most
It is approximately 2.7 mm.

Therefore, when masking or the like is performed on a single sheet of paper and a two-color composite copying machine is used, problems may occur due to resolution problems. FIG. 9 shows an example of this, and shows the relationship between a designated area on a document, a light emitting device, and an image copied onto a sheet of paper. As shown in the figure, by specifying two points, Pl and P2, on the original, a rectangular area with these two points as diagonals is specified, and composite copying is performed using different colors inside and outside this area. As shown in the figure, an image is formed on the paper in the color M within the designated area, and in the color N outside the area, but the direction is 90 degrees from the arrangement direction of the light emitting devices 7. There is a problem that an image is not formed as shown in L at the boundary of the area, or an image with two colors overlapping is formed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a selective static eliminator for a copying machine, which eliminates the above-mentioned conventional problems by selectively removing static latent images on a photoreceptor with high resolution.

(e) Means for Solving the Problems The selective static eliminator of the present invention selectively removes static electricity from an electrostatic latent image formed on a photoreceptor, or from a photoreceptor on which an electrostatic latent image is to be formed. In a copying machine, a light-emitting means for selectively removing static electricity at a position is provided between a charging device and a developing device, and a static-elimination control means for controlling this light-emitting means is provided, wherein the light-emitting means is a transmission device in which a plurality of segments or dots are arranged. (f) Function: In the selective static eliminator for a copying machine of the present invention, a transmission type electrochromic display element in which a plurality of segments or dots are arranged is used as a light emitting means. It is composed of a display element and a backlight, and this transmission type electrochromic display element eliminates static electricity by selectively transmitting the light of Buffkrite to the photoreceptor. At this time, in the transmission type electrochromic display element, each of a plurality of segments or dots that selectively transmit or block light from the backlight can be arranged at a pitch finer than that of a conventional light emitting diode. , it is possible to improve the resolution of the area to be neutralized.

(g) Embodiment FIG. 2 is a diagram showing the configuration of a copying machine to which a selective static eliminator according to an embodiment of the present invention is applied. The explanation will be given below.

A photoreceptor drum 20 is provided approximately at the center of the main body of the copying machine, and various units for executing the copying process are provided around the photoreceptor drum 20. The unit includes a charging device 219, a light emitting device 7. First developing device 2
2a, second developing device 22b, transfer and peeling charger 23. A cleaner unit 24 and the like are provided. The light emitting means 7 is a device for selectively neutralizing the surface of the photoreceptor drum charged by the charging device 21, and is composed of a backlight and an electrocomic display element, as will be described later. Reference numerals 36a, 36b, and 36c each represent a paper feed cassette, and the paper selectively sent out from one of the cassettes is conveyed toward the photosensitive drum 20 via the registration roller 35. The paper onto which the toner image has been transferred is fixed by a fixing roller 25 and is conveyed to the left in the figure. At this time, by the action of the claws 26 and 27, the paper is ejected as it is to the tray 31, or after being ejected to the tray 29 once, it is again conveyed in the opposite direction by the reversing roller 28, and then passed through the roller 30 to the tray. 31 and is discharged. Such selective conveyance is controlled depending on whether double-sided copying or composite copying is performed on one side of the paper. When copying is performed again on the paper stored in the tray 31, only the topmost sheet of the paper stored in the tray 31 is selectively conveyed by the rotation of the rollers 31a and 31b.
2, 33, and 34, and is again conveyed toward the registration rollers 35.

As described above, static electricity is removed from a predetermined area on the photoreceptor drum, and composite copying and the like are performed.

FIG. 3 is an external perspective view showing the structure of the light emitting means 7 shown in FIG. In the figure, 70 represents an electrochromic display element, which is fixed by an angle 79 to a circuit board 80 made of a metal base material.

FIGS. 4A and 4B show front and side cross sections of this light emitting means, respectively. Metal-based circuit board 80
As shown in the figure, a recess is formed in which the electrochromic display element 70 is connected to the connectors 83a and 8.
They are electrically connected via 3b, 83c, and 83d. Further, the angle 79 fixes the display element 70 to the circuit board 80. Four lamps (fuse bulbs) are installed in the space formed in the recess of the display element 70 and the circuit board 80.
A backlight consisting of a reflective case 81 and a reflective case 81 is housed therein.

Since the light emitting means is configured as described above, the light from the bank light can be selectively guided to the surface of the photoreceptor drum by turning each segment of the electrochromic display element into a colored state or a decolored state.

FIGS. 5 and 6 show an external perspective view and a partial sectional view of the electrochromic display element. As shown in both figures, the electrochromic display element has a glass substrate 7.
1.72. One glass substrate 71
As shown in FIG. 6, a plurality of segments 75 made of a transparent conductive film are provided, and the surface thereof is coated with an electrochromic material 74. A counter electrode 76 made of a transparent conductive film is formed on the entire surface of the other glass substrate 72, and an electrolytic layer 173 is formed between the two glass substrates.
is included. The periphery of the two glass substrates pasted together is sealed by a sealing member 78, and a transparent electrode 76 formed on the glass substrate 72 is electrically connected to the inside of this sealing member from the edge of the glass substrate 71. A conductive member 77 is provided at a predetermined location to be taken out.

If tungsten oxide is used as the electrochromic material, the segments can be colored blue by passing a negative charge through a counter electrode, and can be decolored by passing a current in the opposite direction. Further, by using iridium hydroxide as an electrochromic material, gray coloring and decoloring can be performed, and the material is selected depending on the sensitivity of the photoreceptor drum.

FIG. 7 shows the final stage of the drive circuit for the electrochromic display element. In the figure, if 1 is applied to the input IN, Q2 is turned on and the segment 75 is colored. Further, if +■ is applied to IN, the transistor Q1 is turned on and the segment 75 is decolored. FIG. 8 shows the relationship of transmittance to wavelength in the colored and decolored states of such an electrochromic display element. As shown in the figure, particularly in the visible region, which is the sensitive region of the photosensitive drum, a high contrast is exhibited between the colored state and the decolored state, and it is possible to sufficiently and selectively remove the charge from the electrostatic latent image.

FIG. 1 shows a block diagram of a control section of a copying machine using the light emitting means constructed as described above. The entire control is performed by CPU program processing, and the program is written in the ROM in advance. Also, RAM
3 is used as various working areas when executing this program. The display memory 4 is a memory that stores display contents of the electrochromic display element 70,
The contents written in this display memory are read by the display controller 5, and a display control signal is output to the driver 6. The driver 6 includes a drive circuit as shown in FIG. 7 in its output stage, and selectively colors/colors a plurality of segments of the electrochromic display element 70.
Make it colorless. Relay 9 controls the bank light 82 on/off, and the CPU controls I1 at the necessary timing.
This relay 9 is activated via the 0 port 8.

The operation panel 11 is an input means used for inputting an image area, that is, an area where an electrostatic latent image should be removed in various modes such as trimming and masking.
The UI reads this content and writes the display content to the display memory 4. The I10 port 8 is also connected to various sensors 12 such as a copy lamp, a heater lamp for the fixing roller, motors for driving various rollers, and a paper sensor for detecting the presence or absence of paper.

The control unit is configured as described above, and the CPU detects a predetermined timing from the start timing of document operation, writes the coloring/decoloring pattern of the electrochromic display element to the display memory 4, and writes the coloring/decoloring pattern of the electrochromic display element to the display controller 5. By outputting a display control signal to the electrochromic display element, the electrochromic display element displays a display. Further, at this time, the relay 9 is activated at a predetermined timing to control the lighting of the backlight 82.

Although an electrochromic display element having rod-shaped segments was used in the embodiment, it may be provided with dot-shaped display electrodes and used in the same manner.

fh1 Effects of the Invention As described above, according to the present invention, the light emitting means for selectively eliminating static electricity on the surface of the photoreceptor is composed of a transmissive electrochromic display element in which a plurality of segments or dots are arranged and a backlight. , segments or dots can be constructed with very fine pitch,
It becomes possible to perform static elimination with high resolution. This makes it possible to eliminate inconveniences such as missing or overlapping images at the boundary when performing composite copying of multiple colors. Furthermore, there is no need to assemble a large number of light emitting elements, and costs can be easily reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control section of a copying machine to which a selective static eliminator according to an embodiment of the present invention is applied, FIG. 2 is a diagram showing the configuration of the copying machine, and FIG. 3 is a light emitting device used in the copying machine. 4(A) and 4(B) are front and side sectional views thereof, FIG. 5 is an external perspective view of an electrochromic display element used in this light emitting means, and FIG. 6 is its appearance. A partial cross-sectional view, and FIG. 7 is a circuit diagram showing the final stage circuit of the driver that drives the electrochromic display element.
FIG. 8 is a diagram showing the characteristics of the electrochromic display element, and FIG. 9 is a diagram for explaining problems in the conventional copying machine. 7-Light emitting means, 21-Charging device 22a, 22b-Developing device, 70-Electrochromic display element, 822-82d
- lamp, (82,81) - backlight.

Claims (1)

[Claims] (1) A charging device and a developing device are light-emitting means that selectively eliminate static electricity from an electrostatic latent image formed on a photoconductor or selectively eliminate static electricity from a position on a photoconductor where an electrostatic latent image is to be formed. A copying machine equipped with a static elimination control means provided between the light emitting means and controlling the light emitting means, characterized in that the light emitting means is composed of a transmissive electrochromic display element in which a plurality of segments or dots are arranged and a backlight. Selective static eliminator for copying machines.