JPS63221378A - Electrostatic recording device - Google Patents

Abstract

PURPOSE:To regulate electric current flowing into a photosensitive body and to prevent light memory by forming a first destaicizing light source between a developing means and a transferring means, forming a second destaicizing light source between the transferring means and an electric charging means, and illuminating the photosensitive body with lights each different in wavelength. CONSTITUTION:An electrostatic latent image is formed on a uniformly charged photosensitive drum 4 with an LED array 6, surface potential at each position exposed to light is lowered to 25V, and at the same time a large amount of electrons are trapped in the inside of that position, the surface of the photosensitive drum 4 reversely developed is illuminated with light of <650nm wavelengths from a green fluorescent glow tube, then after a transfer step and a cleaning step, the drum 4 is illuminated with light of >=650nm wavelengths from a red LED 22, thus permitting the surface potential of the drum 4 to be made uniformly 0V at that time and an amount of trapped electrons in the inside of the photosensitive body to be uniformized, and consequently, light memory not to occur.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention (a) develops with the electrostatic latent toner formed on the photoreceptor, and the toner *? It is an electrostatic recording device that transfers data onto recording paper, and is equipped with two types of static eliminating light sources. (b) Conventional technology A well-known electronic copying machine or electrostatic printer can be used to print frames, W& Selenium, cadmium sulfide, etc. have been used as base materials, but
Recently, amorphous silicon (hereinafter abbreviated as a-S1) has been attracting attention as an alternative to these photoreceptors. ◇ This a-8i sensor body is harmless to the human body, ft,
Although it surpasses all conventional photoconductors in terms of sensitivity, dust resistance, etc., when a long wavelength light source such as a tank stainless lamp is used as a static elimination light source, the exposed area will be charged by the next charge! A large amount of band current is required to obtain a suitable surface potential (this phenomenon is called the pre-exposure effect).
.

Here, while rotating the a-81 sensing element (drum),
In order to observe the change in the surface potential in the circumferential direction, an experiment was carried out by placing a static elimination lamp, a strip Tmm croton, an exposure lamp (for image formation) and a surface potentiometer T around the A-8I photoreceptor. However, I obtained data as shown in the graph of the second meat.
-1 As is clear from this graph, once m yuan is
Even if the surface potential decreases by 200V at the casing and is charged again after being removed by the charge removal lamp at the friend part a, the original surface potential (40
DV) IC materz did not rise and was about 370V1 [cIrl0 This phenomenon is the pre-exposure effect mentioned above, and the potential (50V) r! , the thickness of the 0a-3i negative light that will remain on the photoreceptor as an optical memory is about 20 μm, and since there are inevitably many defects in the applause, 19dP Yaria ( Is it a photoreceptor in which a positive charge (L) is given to the zero-charging layer (a) where electrons and holes are trapped? , when selectively exposing to light to form a silent latent layer, among the pair of electron θ and hole ■ generated in the L a-8i negative light peak during the exposure process shown in Figure 5, the positive electron on the surface of electron er1 is charge? At this time, when the hole ζ aluminum group @ 12 moves in one direction (inward), the a-8i photoreceptor has as many defects as described above. exists, so a part of the electron e shown in the fourth factor is dragged.

The t-electrons e trapped in this way spring up in the next band and are canceled by the positive band 'IIL charge, so the a-8i bad light 111 has the same amount of charge as the first one?
Even if it is applied, the original surface potential 'jk cannot be obtained and the above-mentioned method remains as an optical memory, resulting in uneven charging.

The above-mentioned phenomenon becomes more pronounced as the wavelength of the light emitted from the exposure lamp becomes longer.

For this reason, compared to light with long wavelengths, light with seven wavelengths is a
The absorption coefficient for -8i ill-effect light is large, and the light with a wavelength of -8i is large! Most of the electrons are absorbed in a shallow part from the surface of the a-8i light il+, and the travel distance of electrons e becomes shorter, so fewer t are trapped, but on the contrary, the long wavelength light 1a-81 Since it reaches deep into the body +1+, the distance traveled by electron e becomes longer.
This is thought to be due to an increase in the amount of trapped electricity.In addition, in order to uniformly remove the charges on the photoreceptor il+, in the process before recharging, the inside of the photoreceptor is set up as a static elimination lamp to sweep away. However, at this time, if the wavelength of the light beam from the static elimination lamp is too small, the light beam will not reach the electrons θ trapped deep inside the photoreceptor, and the electrons θ will not be excited. Original memory is likely to occur.

- 10,000, long emission wavelength - Static neutralizing light? When irradiated into the photoreceptor,
The electrons lurking deep inside (→a are excited, making it difficult to generate partial original memo IJH, but next time the electrons e are trapped in the entire photoconductor mountain, and when it is recharged,
In order to obtain the desired surface potential 7, it is necessary to increase the current flowing into the photoreceptor DI.

Pl Problems to be solved by the invention As mentioned above, in order to suppress the generation of the original memory, the conventional technology uses long-wavelength neutralizing light. Is this long wavelength static electricity removal light that is constant when irradiating the photoreceptor? When irradiated, a large amount of current flows into the photoreceptor.

The current flowing into the photoconductor ζ depends on the current flowing into it, and this is often 0. Therefore, the current flowing into the photoconductor? The present invention in the middle section is designed to solve the problem (increasing the number to 0), a photoreceptor, a means for uniformly charging the photoreceptor, a means for selectively exposing the entire charged photoreceptor to light, In an electrostatic recording device, the electrostatic recording device is provided with a means for applying an electrostatic latent toner formed on the exposure means and a means for transferring the toner on the photoconductor to an ARFE recording paper. Between the current means and the transfer means, the wavelength is mainly 6500A.
A first static eliminating light source that irradiates the photoconductor with light of less than 11 OA is provided, and a second static eliminating light source that primarily irradiates the Hk photoconductor with light having a wavelength of 650 OA or more is provided between the transfer means and the charging means. What are you doing? (e) Function of the electrostatic recording device according to the present invention, the high surface potential of the unexposed area is erased by the eel wavelength light irradiated from the first static eliminating light 11jl, and the high surface potential of the unexposed area is erased. The long-wavelength light irradiated from the static-eliminating light beam in step 2 excites electrons trapped deep in the exposed area, and some electrons are also trapped in the unexposed area, so the photosensitivity depends on the presence or absence of exposure. Embodiment 441-α This is a schematic configuration diagram showing an electrostatic printer equipped with an embodiment of the non-invention. A photosensitive drum (4) whose circumferential side is coated with a-8i bad photo+11 is installed in the center so as to be rotatable in the direction of the arrow.

On the top of the photosensitive drum +4+, there is an eel focusing lens array 15.
+ is provided, and a light emitting diode array (hereinafter abbreviated as MgD array 61) is fixedly installed on the upper part of this semifocal lens row +51, and this LED array (6-) , the Ω focal lens array (51) is projected onto the peripheral side wall of the photosensitive drum 14+, and the @ focal lens array (51) is uniformly charged (approximately 400 V) on the upstream side of the photosensitive drum 14+'l. Corotron+7 for charging
The lower right side of the printer body +3+ is equipped with a photosensitive drum (developing device ll for developing with electrostatic toner formed on 41)+1 on the downstream side. A paper feed section 11 (inside of which a large number of recording papers +91 are stacked and stored) is attached to the downstream end of the paper feed cassef (III), which is installed so that it can be inserted and removed in the direction of the arrow. The tth paper feed roller 1 is pressed against the topmost recording paper (91) and feeds this recording paper 19+1-1 sheets at a time.
D is provided on the downstream side of this paper feed roller συ, and the recording paper +9+ that is fed from this roller 111 is
1-A pair of register rollers a3α2 are provided to re-feed the photosensitive drum 14+ at the appropriate timing after stopping the photosensitive drum 14+.
4+ Upper toner g1r recording paper + Corotron α3 for tight transfer to 91 and recording paper + 91 'lj W&
Minute s# to separate from optical drum +4+! The corotrons I are arranged adjacent to each other, and the frame and toner me are transferred to the upstream side of the corotron α for separation, and the recording paper +9+ is printed. Heat roller pair α for electrodeposition
Vacium conveyor σD for transporting to σ9JIC
It is equipped with the above-mentioned Pachium conveyor α7I.
The fan is a source of vacium. On the downstream side of the pair of heat rollers (151 + 161), there is a paper discharge tray (19) from which the recorded vertical track on which the toner is fixed is ejected, and a paper discharge tray (19) is detachably attached to the vacuum conveyor (1 sheet). Above the A1 recording paper 19+
A cleaning device l11■ is provided to clean toner remaining on the photosensitive drum 141 that has not been completely transferred. ! (8+ and corotron α for transcription
A green fluorescent glow tube (211), which serves as a first static-eliminating light, is provided on the second side facing the photosensitive drum (4).The peak wavelength H5 of this green fluorescent glow tube (QD)
In addition, the cleaning device (■) and the charging corotron 17
A red light emitting diode 1 is placed between the
The peak wavelength of the red LED (221) (hereinafter abbreviated as red LED) (221) is 6600χ, which is located opposite the photosensitive drum +4+. The red I and ED@frames both extend in a direction parallel to the rotation@line of the photosensitive drum +41.

Figures 6 to 12 are schematic diagrams showing the potential on the surface of the photoconductor and the potential inside the photoconductor (inside the deep part of the photoconductor; the sixth factor is the charging process; !, the electrostatic latent image forming process, the 8th development process, the 9th ri!J, the static elimination process using the green fluorescent glow tube (211), the 0th a transfer process, the 7th 11 Figure Po Red 1.E
The static elimination process shown in D@ and the charging process shown in the 12th column are shown below.
The charging corotron (7μ) has a surface potential of 500V on the surface of the charged photoreceptor. The image forming LED array 1 (1 on 61) is placed on the uniformly charged photoreceptor 11+. When the desired light beam is irradiated, an electrostatic image is formed on L as shown in Fig. 7. In other words, the light beam is irradiated and the surface potential of the nine parts decreases to 25V, and at the same time, the above-mentioned a is formed inside the relevant part. A large amount of electrons are trapped.

Next, the toner is subjected to reversal development, and as shown in FIG. When the fluorescent blow tube Qυ is irradiated with a short wavelength light beam, the surface potential of the area other than the area to which the toner is attached becomes OV, as shown in Figure 9. At this time, the photoreceptor 11
Since the light rays are blocked by the + toner at the part a1 where the + toner is attached, the α surface potential remains at the part a', and a small amount of electrons are trapped inside the photoreceptor IC, as described above. Second, in this process, the beam of gS wavelength illuminates the frame.
Since J is released, only α-attached electrons are generated inside the photoreceptor il+, and the amount of trapped electrons is also reduced. □At this point, ζ, some of the trapped electrons are also immediately released by V. , Immediately after the occurrence, L9 further decreases. Then, through the transfer process and cleaning process, the toner on the photosensitive drum 141 is removed, and finally, the red LED Ω is irradiated with a light beam with a longer wavelength. Then, the surface potential in the photoconductor becomes equal to @ticov □At this time, the amount of electrons trapped inside the photoconductor also becomes uniform as shown in Figure 111. Therefore, in the optical memory However, as a result of the experiment, *exposure effect a, wavelength 650OA? As a boundary, it is known that P1 is emitted when the light is higher than that, and a is emitted when the light is lower than that, which is poor.◇First light source:
and a second light 1WirX, a light source of the same type (e.g. continuous wavelength?
The first light source is equipped with a filter that cuts off light with a ζ wavelength of less than 6500A, and the second light source is equipped with a filter that cuts off light with a ζ wavelength of 650OA or more. It doesn't work even if it is configured to work.

In addition to the tungsten lamp, a fuse bulb, halogen lamp, or mercury lamp can be used as the second light source.
The JI+ light source has one yellow light emitting diode in addition to the green light emitting diode? Can be used with all fluorescent lights.

(G2 Effects of the Invention In the present invention, between the 5 phenomenon means and the transfer means, light having a wavelength of less than 650 OA is mainly irradiated onto the 11J?S source @
In addition to the first static-eliminating light source, a second static-eliminating light source is provided between the transfer means and the charging means, which irradiates the photoreceptor with a light beam mainly having a wavelength of 6500 A or more. When the light beam is irradiated, it is possible to suppress the current flowing into the photoreceptor and also prevent the occurrence of optical memory.

Therefore, Pe5ft can plan for a long-term mission of the body.

[Brief explanation of the drawing]

A schematic configuration diagram of an electrostatic printer in which an embodiment of the present invention is installed in the first column, a graph showing the charging potential of the conventional example in 1!211, and a graph showing the charging potential of the conventional example in the fifth factor and A schematic diagram showing a cross section and a carrier, FIG. 5A is a graph showing a band position of an embodiment of the present invention, and FIGS. 6 to 12 are schematic diagrams showing potentials on the surface and inside of a photoreceptor.

Claims (1)

[Scope of Claims] 1. A photoreceptor, a means for uniformly charging the photoreceptor, a means for selectively exposing the charged photoreceptor, and an electrostatic latent image formed by the exposure means to a toner. In an electrostatic recording device that is equipped with a means for developing a toner image on a photoconductor and a means for transferring a toner image on a photoreceptor onto recording paper, there is
A first static eliminating light source that irradiates the photoreceptor with a light beam with a wavelength of less than 00 Å is provided, and a second static eliminating light source that irradiates the photoreceptor with a light beam with a wavelength of 6500 Å or more is provided between the transfer means and the charging means. An electrostatic recording device characterized by: 2. The electrostatic recording device according to claim 1, wherein toner adheres to the exposed portion of the photoreceptor.