JPS631326Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention consists of a single photoconductor on a photoconductive substrate, and if necessary, a recording layer coated with an insulating layer on which needle-shaped electrodes are arranged opposite to each other to generate electrostatic charge. An electrostatic recording device that is used for recording, and is equipped with a device for removing the heavy charge generated by a cleaning device on the surface of the recording drum, that is, the recording layer, and at the same time applying a bias voltage to the surface of the recording drum. It is related to.

Generally, in a transfer type electrostatic recording device, a recording layer is formed by laminating a photoconductive layer on a conductive substrate, or a dielectric layer is laminated as necessary, or a recording layer is formed by laminating a dielectric layer on a conductive substrate. An electrostatic latent image is formed on the surface of the layer using a needle-shaped electrode, and after this latent image is developed with toner powder, it is transferred to a supporting material such as paper.
It is necessary to remove residual toner on the surface of the recording layer after transfer using a cleaning means. Mechanical wiping methods such as brushes and webs have been used as cleaning means, but conventionally, due to friction when these come into sliding contact with the surface of the recording layer, electric charges are generated with a certain polarity on the recording layer. This often caused problems in subsequent processing. For example, as a subsequent process, in order to reduce the voltage applied to the drive circuit of the acicular electrode as much as possible, as a step before forming a latent image, a potential of a certain level with the opposite polarity to the voltage applied to the acicular electrode is applied to the recording layer. However, the generation of electric charge by the above-mentioned cleaning means causes variations in this constant level of electric potential application, causing problems such as black streaks and other stains on the final recorded image. .

The present invention solves the above-mentioned problems, and uses a simple device to provide a static image that is free of stains and reduces costs by lowering the output voltage of the drive circuit applied to the recording electrode. The purpose is to provide an electronic recording device.

In order to achieve the above object, the present invention disposes an AC corotron for charge removal and bias application between a mechanical wiping type cleaning device arranged along the recording layer on the circumferential surface of the recording drum and the recording electrode. However, an alternating current voltage on which a direct current component having a polarity opposite to that of the image forming signal voltage applied to the recording electrode is superimposed is applied to the alternating current corotron.

With this configuration, according to the present invention, due to the friction between the mechanical wiping type cleaning device and the surface of the recording layer,
It becomes possible to remove charges generated on the surface of the recording layer and to apply a uniform and constant potential to the surface of the recording layer, the polarity of which is opposite to the polarity of the image forming signal voltage applied to the recording electrode. As a result, it is possible to reduce the output voltage of the drive circuit applied to the recording electrodes, thereby realizing cost reduction, and to obtain a clean recorded image.

FIG. 1 is a schematic diagram showing one embodiment of the present invention.
is a recording drum with a recording layer 4A provided on its surface, and a mechanical wiping type cleaning device 3, a corotron 2 for neutralizing static electricity and applying a bias, a needle electrode 1, a developing device 7, and a corotron for transfer. 6. The static eliminating corotrons 8 are arranged in this order. As is well known, an electrostatic latent image is formed on the recording layer 4A by applying a high voltage to the needle electrode 1 from its drive circuit 9, and this is developed with toner in the developing device 7.
After the toner image is transferred onto the transfer paper 5 by the transfer corotron 6, it is fixed and a copy is obtained. The residual toner on the recording layer 4A is neutralized by a static eliminating corotron and then removed by a cleaning device 3. The feature of the present invention is that an AC corotron 2 for neutralizing static electricity and applying bias, which is energized by a voltage in which a DC component 12 is superimposed on an AC component 11, is provided between the cleaning device 3 and the needle electrode 1. It is in. This configuration allows the brush,
Electric charges generated on the surface of the recording layer 4A due to friction between the cleaning device 3 such as a web and the surface of the recording layer 4A can be removed, and at the same time, a uniform and constant potential can be applied to the surface of the recording layer 4A. It goes without saying that the polarity of the superimposed DC component must be opposite to that of the signal voltage applied to the needle electrode 1.

Therefore, according to the present invention, it is possible to reduce the output voltage of the drive circuit applied to the needle electrode 1 by simply adding a simple device, and it is easy to obtain a clean recorded image.

Experimental Example 1 The surface of an aluminum substrate was oxidized as a recording member material, and selenium was vapor-deposited thereon to a thickness of 80 μm. On top of this, apply polyurethane (rethane) to a thickness of 10 μm.
4026), and in the configuration shown in Fig. 1, 5.2 KV AC with a negative DC component superimposed on the corotron 2 for applying static elimination bias was applied so that the surface potential of the recording layer 4A became -300 V. about −200v
12 of the DC components were superimposed. Next, add + to the needle electrode 1.
When a signal voltage of 600V was applied and development and transfer were performed, a good image with an image density of 1.2 was obtained. There were no black streaks that would normally occur at this time, which were thought to be caused by mating between the cleaning device and the recording drum. Furthermore, when using AC 5.2kV without superimposing negative DC components under the same conditions, the surface potential on the recording medium is -50V.
The recording voltage to obtain the same image density is +
The voltage increased to 850v, exceeding the switching ability of the drive circuit.

Experimental Example 2 In Experimental Example-1, 5.2 kV AC with a negative DC component superimposed was applied to the corotron 2, and a negative DC component 12 of about -300V was applied so that the surface electric potential on the recording drum was -400V. Superimposed. Next, add + to the needle electrode 1.
When a signal voltage of 500 V was applied and development and transfer were performed, a good image with an image density of 1.2 and no triboelectric pattern was obtained. At this time, no black streaks, which were thought to be caused by frictional charging that normally occur between the cleaning device and the recording drum, were observed, and the cleaning effect was complete.

The cleaning device 3 used in Experimental Examples 1 and 2 presses coarse paper against the drum 4 while rotating in the opposite direction. Further, the amount of ozone generated in this process was significantly smaller than in the usual case where a negative corotron is provided separately for biasing.

Experimental Example 3 Instead of the selenium drum in Experimental Example-1, a low-resistance resin oligo Z (volume resistivity 10 ⁸ Ωcm:
Tomoekawa Paper Co., Ltd.) was coated with a thickness of 20 μm, and a polyester (Mylar) film was coated with a thickness of 6 μm on top of this, and this was used as a recording medium.The recorder was assembled into an apparatus with the configuration shown in Figure 1, and a straight stream was sent to the Corotron 2. I applied 4kv AC with superimposed components, and added a direct current of +100v so that the potential on the drum was +200v. Next, when a signal of -600V was applied to the needle electrode 1, a good image with an image density of 1.1 was obtained. In this case, the amount of ozone generated was significantly smaller than when a plus corotron was used separately and the bias was mounted on the drum. In addition, almost no electrification caused by the cleaning device was observed.

As described above, according to the present invention, an AC corotron for neutralization and bias application with a DC component superimposed after the cleaning cycle is provided to effectively remove the frictional charge caused by the mechanical wiping type cleaning device on the recording medium.
In addition, since the bias potential on the recording medium is controlled, a clean recorded image can be obtained with a simple configuration, and the voltage applied to the needle electrode can be lowered. As a result, the output voltage of the drive circuit applied to the recording electrodes can be lowered, and cost reduction can also be realized.
Furthermore, compared to the case where a bias corotron is provided separately, there is an advantage that the amount of ozone generated is reduced, and it is excellent in terms of low pollution, low power consumption, miniaturization, and low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Acicular electrode, 2... Corotron for charge removal/bias application, 3... Cleaning device, 4... Recording drum, 4A... Recording layer, 5... Transfer paper, 6... Corotron for transfer, 7... ...Developing machine.

Claims (1)

[Scope of utility model registration request] A recording drum provided with a recording layer on its surface, an electrode for forming an electrostatic latent image on the recording layer of the recording drum, a drive circuit for applying a signal voltage for forming the electrostatic latent image to this electrode, and the electrode. A developing device that develops the electrostatic latent image formed on the recording drum by the developing device, and a mechanical device that removes the residual toner on the recording drum after the toner image on the recording drum developed by this developing device is transferred to the transfer device. A wiping type cleaning device, a corotron for neutralizing static electricity and applying a bias disposed between the cleaning device and the electrode, and a power source for applying a voltage in which an alternating current component and a direct current component are superimposed to the corotron for neutralizing static electricity and applying a bias. 1. An electrostatic recording device comprising: an electrostatic recording device, characterized in that the polarity of the DC component applied to the static elimination/bias application corotron is opposite to that of the signal voltage applied to the electrode.