JPH0470870A - Electrostatic image continuous shooting method - Google Patents

Abstract

PURPOSE:To obtain a high-definition electrostatic image even if consecutive photographing is carried out by removing a residual charge on the surface of a photosensitive body, after a voltage application exposure is carried out, or carrying out the next voltage application exposure after uniform electrification is carried out to erase an after-image. CONSTITUTION:A film-like charge holding medium 22 is opposed to the photosensitive body 10, the voltage application exposure is carried out, and the charge of a polarity corresponding to image forming conditions is electrified on the surface of a photoconductive layer 13. Before the next voltage application exposure is carried out, a switch 31 is turned off in a state where the photosensitive body 10 is separated from a film 20 by a prescribed distance, and an overall uniform exposure is carried out from the side of the photosensitive body 10. The photoconductive layer 13 has conductivity, and a surface charge is combined with a carrier inside the photoconductive layer or leaked, and extinguished. On the other hand, a voltage is not applied between the photosensitive body and the film 20, so that discharging does not occur between them, and the side of the film 20 is not affected by an uniform exposure.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electrostatic image continuous shooting in which the influence of charges remaining on the surface of a photoreceptor due to the previous voltage application exposure is eliminated and the next voltage application exposure is performed. It is about the method.

[Conventional technology]

FIG. 10 is a diagram for explaining a conventional electrostatic image recording method.

A photoreceptor 10 having a transparent electrode 12 and a photoconductive layer 13 formed on a support 11 and a charge holding medium 20 having an electrode 22 and an insulating layer 23 formed on a support 21 are arranged to face each other.
When image exposure is performed by applying a voltage of a predetermined polarity between 22 and 22 from the power supply 30, the exposed photoconductive layer portion exhibits conductivity, and discharge occurs between the photoreceptor 10 and the charge holding medium 20 in that portion. For example, (+) charges are accumulated on the insulating layer 23 depending on the exposure amount. At this time, carriers are generated in the exposed portion of the photoconductive layer 13, and (-) charges are transferred to the transparent electrode 1.
2 side, the (+) charge moves to the photoconductive layer surface,
Corresponding to this charge, air ionization (
-) Charge is accumulated.

[Problem to be solved by the invention]

As described above, an electrostatic image is formed on the charge holding medium by voltage application exposure, but at the same time, charges of polarity depending on the image forming conditions are accumulated on the surface of the photoreceptor. For example, when selenium is used as the photoreceptor, the 11th
It exhibits a dark decay characteristic as shown in characteristic A in the figure, and gradually discharges and decays, and when an organic photoreceptor is used, as shown in Fig. 12 (a), by the time it decays, will take several tens of seconds. Therefore, when attempting to take continuous pictures using the electrostatic image recording method as shown in FIG. 1O, there is a problem in that the influence of the residual charge on the photoreceptor remains, making it impossible to record high-quality electrostatic images.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electrostatic image continuous shooting method that eliminates the influence of afterimages on a photoreceptor and can obtain high-quality electrostatic images even during continuous shooting. do.

[Means to solve the problem]

The present invention provides a photoreceptor in which a photoconductive layer is formed on a conductive layer;
In an electrostatic image recording method in which a charge holding medium having an insulating layer formed on a conductive layer is placed facing each other and image exposure is performed while a voltage is applied between both conductive layers, residuals on the surface of the photoconductor are removed after exposure by applying voltage. The method is characterized in that after the afterimage is erased by removing the electric charge or uniformly charging it, the next voltage application exposure is performed and continuous shooting is performed.

[Effect]

After forming an image by voltage application exposure and before performing the next voltage application exposure, the present invention is capable of leaking charges by irradiating the photoconductor with light, removing charges by contacting the photoconductor with a conductive member, or uniformly charging the photoconductor. , the afterimage on the photoconductor is rapidly attenuated by uniform charging by direct current or alternating current discharge, heating, leakage of charge by conductive liquid or vapor, etc., and this eliminates the effects of the photoconductor afterimage. This makes it possible to take continuous pictures and obtain high-quality electrostatic images.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention in which a photoreceptor afterimage is erased by light irradiation, and the same numbers as in FIG. 10 indicate the same contents. In addition, 31 is a switch, 41.4
2 is a supply roller.

The charge holding medium 20 is formed, for example, in the form of a film so as to be compatible with continuous shooting, and is sequentially supplied to the position of the photoreceptor by rollers 41 and 42. When this film-like charge holding medium 22 is exposed to voltage while facing the photoreceptor 10, as explained in FIG. Become electrically charged. If the next voltage application exposure is carried out immediately in this state, the charged charges will still remain unattenuated and will have an effect.

Therefore, before the next voltage application exposure, with the photoreceptor 10 separated from the film 20 by a predetermined distance, the switch 31 is turned to
L, when the entire surface is uniformly exposed from the photoreceptor side, the photoconductive layer 13
becomes conductive, and the surface charges combine with carriers inside the photoconductive layer or leak and disappear. On the other hand, since no voltage is applied between the photoreceptor and the film 20, no discharge occurs between the photoreceptor and the film 20, and uniform exposure does not have any effect on the film 20 side.

When light irradiation is performed in this way, for example, when a selenium photoreceptor is used, as shown by characteristic B in FIG.
, 0. When irradiating light of 6 μw/cat and with an initial voltage of 900 V, it was possible to attenuate it in about 1 second. In addition, if an organic photoreceptor is used, the first
As shown in Figure 2 et al., at a wavelength of 540 nm, 0.6 μw
When irradiated with light with a power of /cat, it was possible to attenuate it in about 1 second.

In this way, by irradiating the entire surface with light before performing the next voltage application exposure, the photoreceptor afterimage can be rapidly erased. In addition, as shown in FIG. 1, etc., the photoreceptor 10 is
Rotate the photoconductive layer side away from the charge retention medium,
Alternatively, the structure may be such that uniform exposure is performed over the entire surface from either side of the support.

FIG. 2 is a diagram showing an embodiment in which a conductive member is brought into contact with the surface of a photoreceptor to leak electric charge.

In this embodiment, for example, the metal foil 50 is moved along the surface of the photoreceptor while being in contact with the photoreceptor and grounded, thereby allowing the residual charge to leak and be attenuated.

Further, as shown in FIG. 3, when the metal foil 50 is superimposed with alternating current from the alternating current power source 51 and brought into contact with the photoreceptor, the surface charge is neutralized and can be rapidly attenuated.

Furthermore, as shown in FIG. 4, a charge eliminating brush may be used to leak charges.

In addition, as shown in FIG. 5, the charging roller 55 is moved along the surface of the photoreceptor to peel and charge it, or as shown in FIG. As shown in Figure 7, the charger 63
It is also possible to erase the afterimage by applying an AC voltage from an AC power supply 61 through the photoreceptor and uniformly charging the surface of the photoreceptor with an AC corona.

FIG. 8 is a diagram showing an embodiment in which charge is leaked by heating the photoreceptor.

In this embodiment, electricity is applied through the electrodes by an AC power source 65,
The resistance heating induces a thermally stimulated current in the photoconductive layer and erases residual charges.

FIG. 9 is a diagram showing an embodiment in which electrical charge is leaked by spraying conductive vapor, for example water vapor.

In this embodiment, as shown in the figure, for example, the photoreceptor is
It may also be rotated 0 degrees and sprayed with water vapor. In addition to water vapor, it is also possible to flow a conductive liquid such as an electrolytic liquid along the surface. In that case, if a volatile liquid or gas is used, it will dry immediately, making it suitable for continuous shooting. ing.

〔Effect of the invention〕

As described above, according to the present invention, afterimages can be erased by rapidly attenuating residual charges or uniformly charging before the next voltage application exposure, so image quality deterioration can be prevented even during continuous shooting. It becomes possible to obtain high-quality electrostatic images without causing any damage.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention in which a photoreceptor afterimage is erased by light irradiation, and Fig. 2 shows an embodiment in which a conductive member is brought into contact with the surface of the photoreceptor to leak charge. Figure 3 is a diagram showing an example in which a conductive member is superimposed with alternating current and brought into contact with a photoreceptor to neutralize the charge, and Figure 4 is a diagram showing an example in which charge is neutralized using a static elimination brush. FIG. 5 is a diagram showing an embodiment in which the charge is saturated by peel-off charging, FIG.
Figure 7 is a diagram showing an embodiment in which the charge is saturated by discharge, Figure 8 is a diagram showing an embodiment in which the charge is leaked by heating the photoreceptor, and Figure 9 is a diagram showing a conductive liquid. Figure 10 is a diagram for explaining the conventional image recording method; Figure 11 is the potential when a selenium photoreceptor is used. FIG. 12 is a diagram for explaining the attenuation of potential when an organic photoreceptor is used. 10... Photoreceptor, 20... Charge retention medium, 41.4
2... Supply roller, 50... Metal foil, 53... Static elimination brush, 55... Charging roller, 57... Discharge electrode, 63... Charger, 65... Heating power source. Applicant Dai Nippon Printing Co., Ltd. Agent Patent Attorney Masanobu Hirukawa (7 others) Figure 2゜Figure 2゜Figure 2! 5 drops sail and table σwa electric fL (V)

Claims (1)

[Scope of Claims] (1) A photoreceptor having a photoconductive layer formed on a conductive layer and a charge holding medium having an insulating layer formed on the conductive layer are arranged facing each other, and a voltage is applied between both conductive layers. In an electrostatic image recording method in which image exposure is performed while a voltage is applied, after exposure to voltage application, residual charges on the surface of the photoreceptor are removed or uniformly charged to erase afterimages, and then the next voltage application exposure is performed to perform continuous shooting. An electrostatic image continuous shooting method characterized by: (2) The electrostatic image continuous photographing method according to claim 1, wherein the afterimage is removed by uniformly exposing the entire surface of the photoreceptor from either side. (3) The electrostatic image continuous shooting method according to claim 1, wherein the afterimage is removed by bringing a conductive member into contact with the surface of the photoreceptor. (4) The electrostatic image continuous shooting method according to claim 1, wherein the afterimage is erased by bringing a conductive member into contact with the surface of the photoreceptor and charging it. (5) The electrostatic image continuous photographing method according to claim 1, wherein the afterimage is erased by uniformly charging the surface of the photoreceptor by direct current discharge or alternating current discharge. (6) The electrostatic image continuous shooting method according to claim 1, wherein the afterimage is erased by heating a photoreceptor. (7) The electrostatic image continuous shooting method according to claim 1, wherein the afterimage is erased by exposing the surface of the photoreceptor to a conductive liquid or gas.