KR920002924B1 - Electro graph 's record apparatus - Google Patents

Abstract

The apparatus comprises the cell-base (20) of nonconductor mounted on the lower part of photosentive frame (2), air hale for filling conductor, each of electrodes (31,32,33) positioned to correspond to a charger (1), exposer (3) and film processor (4). The apparatus controls exposure amount in accordance with the contact area of electrode (32) and the cell-base of the exposer (3).

Description

Electrophotographic recorder

1 is a schematic view of a conventional photosensitive device.

2 is a schematic view of the photosensitive device of the present invention.

3 is an enlarged view of the photoconductor of the present invention.

* Explanation of symbols for main parts of the drawings

1: charger 2: photosensitive member

3: exposure machine 4: developing machine

20: cell base 31, 32, 33: electrode

The present invention relates to a photosensitive member used in a copier, a laser printer, etc. using an indirect electrostatic method, so that higher efficiency can be raised.

When describing the general functions of an electrophotographic copying machine such as a copying machine and a laser printer, the parts of the charging unit 1 that are uniformly charged to the photoconductor 2 by the corona discharge and the charged part by the movement of the photoconductor are the light source of the exposure lamp 3. The light reflected from the original is exposed. This exposure produces an electrostatic latent image, such as an image of the original, on the photoreceptor, which is then developed into a toner image by developing toner while passing through the developer 4, and then operating the transfer machine on the paper fed by the paper feed roller. The toner image is transferred, and the remaining toner and latent image are present in the photosensitive member 2, where the remaining toner is removed by a braid and the latent image is removed by a pre-erase lamp array.

As described above, the photosensitive member plays a very important role in electrophotographic recording, and the photosensitive member having such a function has been used by applying a photosensitive material to a conductive metal as shown in FIG. At this time, the conductive metal 11 is used as an electrode to determine the flow direction of ions due to the corona discharge when charging by corona discharge by the charger 1, and during exposure, the exposure current by the pattern generation of the light irradiation site It acts as a sink of light and has the effect of an electrode for forming an electric field during development.It is used as an electrode to determine the flow direction of ions by corona discharge during transfer. It acts as a sink of exposure current.

When the conductive metal base is shared in the electrophotographic charging, exposure, and developing steps, the surface potential of the photosensitive member by charging is reduced by about 100V during the time required for the photosensitive member to be charged from the charger to the developing device. As a result, the surface potential efficiency is substantially reduced. Therefore, the difference between the surface potential and the residual potential is reduced, there is a problem that the radiation efficiency is reduced.

The present invention has been made to solve the above problems, to prevent the occurrence of natural discharge due to natural exposure by the internal light source to prevent the reduction of the surface potential to increase the radiation efficiency and to realize a stable reproduction in halftone reproduction It is the object of the present invention.

Another object of the present invention is to prevent the occurrence of natural discharge by natural exposure by the internal light source.

When described in detail with reference to the accompanying drawings a preferred embodiment for achieving the above object as follows.

The cell base 20 serving as a sink or an electrode on the lower surface of the photoconductor 2 is formed of a non-conductor, and forms a small hole 2 in the cell base 20 and fills the conductor 23 in the hole. The electrodes 31, 32, 33 are formed at the lower end of the processor such as a charger, an exposure machine, a developing machine, a transfer machine, and the like.

Referring to the effects of the present invention configured as described above in detail.

가 되며 노광량은 노광기의 파워 X 노광시간이 되어 Iux·sec로 표현된다. 이때 감광체의 이동속도는 일정하므로 노광량은 노광기(3)의 광량 또는 노광폭 d2을 조절하므로서 조절가능하도록 한다. 상기 설명한 장치에서는 셀베이스를 평면으로 구성하였으나 셀베이스를 원형의 드럼형상으로 실현할 수도 있으며 또한 도전성 브러쉬(22)를 드럼상으로 향하도록 배열시키는 외에 도전성 필름을 겹치게 하여 셀베이스를 실현할 수도 있다.First, when a high voltage direct current is applied to the corona wire 1a of the charger 1, it causes a corona discharge to charge the surface of the photoconductor 2 to have a positive charge. This other electrode portion 31 is formed. At this time, the conductor 23 serves as an electrode that determines the flow of ions. Thereafter, the photoconductor 2 is moved to form an electrostatic latent image on the surface of the photoconductor 2 by the light irradiated from the exposure unit 3. At this time, the electrode 32 acts as an exposure sink by photon generation at the light irradiation site. At this time, the conductor 23 is used as a flow path for the ions. That is, during the movement of the photoreceptor 2 from the charger to the developer, the electrode 31 of the charger and the electrode 32 of the developer are spaced apart from each other. It is possible to prevent the discharge by to maintain the difference between the surface potential and the residual potential. On the other hand, the conduction area of the cell base 20 coincides with the area of the electrode portion, and the exposure amount in the exposure portion 3 can be adjusted by the width of the exposure electrode. In other words, when the moving speed of the photoconductor is V and the electrode width is d2, the exposure time T =

The exposure dose is expressed as Iux sec by the power X exposure time of the exposure machine. At this time, since the moving speed of the photosensitive member is constant, the exposure amount can be adjusted by adjusting the light amount or exposure width d2 of the exposure machine 3. In the above-described apparatus, the cell base is formed in a flat shape, but the cell base may be realized in a circular drum shape, and the cell base may be realized by overlapping conductive films in addition to arranging the conductive brushes 22 to face the drum.

In the above description, the exposure machine 3 of the charger 1 has been described, but in the developing device 4 and the transfer machine, the electrodes and the conductors operate in the same manner and the surface potential of the photoconductor can be maintained.

As described above, according to the present invention, when the photosensitive member moves, the surface discharge and the residual potential difference are reduced by preventing natural discharge due to natural exposure, so that the radiation efficiency is increased, so that the stable reproduction in the halftone reproduction can be achieved. have. In addition, since non-uniform natural discharge is not generated by unnecessary light sources, there is an advantage of improving the exposure efficiency of an internal light source, that is, an exposure lamp or a latent image removal lamp.

Claims (2)

The cell base 20 provided on the lower surface of the photosensitive member 2 is formed of a non-conductor, and forms a small through hole 21 to fill the conductor 23, and to the charger 1, the exposure machine 3, the developer 4, and the like. Electrophotographic recording apparatus, characterized in that the electrode (31, 32, 33) separated in the corresponding position is installed. An electrophotographic recording apparatus according to claim 1, wherein the exposure amount of the exposure machine (3) can be controlled according to the contact area between the cell base and the electrode (32).

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