JPS5879261A - Electrophotographic method - Google Patents

Abstract

PURPOSE:To permit easy formation of different sets of light information by electrostatically charging the surface of a photoreceptor uniformly to potential of a prescribed potential, irradiating the 1st light information thereto to form the 1st latent images and developing said image then charging the photoreceptor uniformly to the potential of the same polarity as that mentioned above, irradiating the 2nd light information to form the 2nd latent image and developing said image. CONSTITUTION:The surface A of a photoreceptor is electrostatically charged uniformly with a corona discharger C which is applied with voltage of a prescribed polarity from an electric power source E1. Thereafter, light is irradiated to the surface of the photoreceptor with an original O1, and a developer T1 charged to a positive polarity is supplied on the surface of the photoreceptor A by a developing device D1 whereby the image is subjected to reversal development. The surface of the photoreceptor is electrostatically charged uniformly in the same manner as mentioned above. Thereafter, different light information is irradiated thereto with an original O2. The intensity of the irradiating light in this time is the voltage at which the potential in the bright part of the photoreceptor surface can be developed thoroughly by reversal development. A developer T2 charged to a positive polarity is supplied to the surface A of the photoreceptor by a developing device D2. Two colors of the developed images are obtained by differing th colors of the developers.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic method, and more particularly to an electrophotographic method that makes it possible to easily form a record based on optical information.

Conventionally, attempts have been made to form records based on different optical information using 1!10 electrophotographic methods, but good results have not always been obtained.

For example, an electrophotographic method has been proposed that uses a photoreceptor laminated with photoconductive materials with different sensitivity wavelength ranges to form a *segment for different optical information, but this requires a special photoreceptor and is complicated to manufacture. Also, the desired 4! It was very difficult to obtain a photoreceptor for this purpose.

The present invention was made in view of the above-mentioned points, and relates to an electrophotographic method that makes it possible to easily form records based on different optical information.

In the present invention, the photoreceptor is uniformly charged to a predetermined polarity potential.
a step of irradiating the first light information to form a first latent image; a step of visualizing the first latent image; and a second charging step of uniformly charging the photoreceptor to the same polar potential as described above. The gist of the present invention is an electrophotographic method characterized by comprising a step, a step of irradiating second optical information to form a 28th layer, and a step of developing a second layer.

Hereinafter, details of the present invention will be explained using specific examples and with reference to the drawings.

Figure 1 is a schematic diagram explaining the basic steps of the method of the present invention.
) to (b) Hiro each process step is shown, and column (a) is the photoreceptor l! ! The true charge change is schematically shown, and the potential change on the O photoreceptor surface is shown in its corresponding step.

The photoreceptor is provided with a photoconductive layer on a conductive base layer a, and a photoreceptor of the Dakarso apparatus is used.

As the constituent material of the photoconductive layer, any O photoconductive material such as S., ZN, OPC, etc. can be used. In the illustrated example, S@
This will be explained using case O.

In the (1)th knee, a predetermined polarity voltage is applied to the voltage ii1. ) is applied to the corona discharger CK to uniformly charge the surface of the photoreceptor. The charging is constituted by a bell that allows one charge of S. The photoreceptor surface potential Vp due to uniform charging is approximately 1000 V in the illustrated example.
It is. (To Rattan 1 (Summer))) In the 1st) process, Hara 1 [
The uniformly charged surface of the photoreceptor is irradiated with light at 0%. ζ
O-field light irradiation-intensity, dark potential VPK on photoreceptor surface
On the other hand, the bright area potential is set to a potential sufficient for reversal development. If you keep it, the residual potential level of 8a bad photosensitivity (approximately 1o
Eliminate static electricity until ov).

For optical information irradiation, the illustrated example shows the case of light transmitted through the original, but reflected light from the original may also be used.Furthermore, laser beam scanning, CRT spot scanning, or a light emitting element such as a LID array modulated by an information signal can be used. Of course, you can also use the following.

In the second step, a positively charged developer T is used in the developer.
1 is applied to the surface of photoreceptor A and reverse development is performed. In order to perform reversal development while preventing the KJJl developer from forming on the non-irradiated area (dark area) of the photoreceptor, a bias of 700 to 000V is applied to the developer using a power supply.

In the ωth step, the surface of the photoreceptor is uniformly charged in the same manner as in the (1) step. Therefore, the illustrated S photoreceptor is recharged to a charging allowable potential of about 1000 VK.

In the first (to) step, different optical information is irradiated onto the document. At this time, the light intensity of the optical information irradiation, the photoreceptor **0Ij
Approximately 100V that can sufficiently develop the potential of one part by reversal development.
It is also O to make it a neighborhood.

In order to supply a positively charged developer T to both sides of the photoreceptor surface in a developing device. Approximately 7 at power supply & to prevent capri
00~soo VO while applying O bias. The color of the coiI agent is the same as the developer color! By setting the number to 41, a three-color 01ll combination can be obtained.

During this development as well, it is preferable to apply a predetermined bias (the potential Vs (approximately 5 oov)) to the fog stopper.

As described above, different optical information can be displayed on the photoreceptor depending on the
A composite image II of Tamekigumo is obtained.

It is imperative that the ζOIi image be transferred onto a transfer material or the like for use, while the surface of the photoreceptor can be cleaned if necessary and prepared for use again.

Fig. 2, a concrete example of an electrophotographic apparatus implementing the method of the present invention! This is a beak diagram.

1 is a photoreceptor drum, which is round and has 8@ deposited on an AI substrate to a thickness of about 50 mm.

2 is a corona discharger that applies positive polarity discharge to the photoreceptor!
Apply to straw.

3 is the 10th optical information irradiation Af.

4 is the 131st imager, and as mentioned above, positive polarity y! Apply 1L of the drug and invert *11.

Using the s-line, tW discharger, positive polarity plasma discharge is applied in the same way as in the corona discharger 2.

6#i is the 20th party information illumination light.

A 21st Afll device 7 supplies positive polarity developer similarly to the first developer device 4.

8. Prepare the surface of the photoreceptor for transfer using the pre-charging coach discharger.

9, the four dischargers for transfer form a corona discharge of opposite polarity to the Rona discharger for precharging, and flow onto the transfer material 9!
Transcribe us.

1 (1) Remove residual developer on the photoreceptor using cleaning means and prepare both surfaces of the photoreceptor for subsequent image so formation.

Executing the first illustrated step in the above-mentioned configuration device
A better two-color image can be obtained.

Fig. 3 is a side view showing a further modification of the device based on the present invention. New lines in common with the device shown in the third figure are indicated by the same numbers.

The illustrated device configuration eliminates the following problems that may occur in the second illustrated device described above, and the circle is also marked O'c.

As in the illustrated example device described above, after the 11111th toner is uniformly charged with positive polarity to form a second latent layer, the toner polarity of the 13th Jg11 and the ! #Both potentials become positive >), and the adhesion between the toner and the photoreceptor is reduced. ζ0:700～
Develop the 2nd f# with a positively charged lK soda using a developing device to which an 800 V K bias is applied. The middle layer is extremely scraped off by the developing device, and the first
There is a risk that the current agents may adhere to the second latent layer and cause color mixing.

In the device shown in FIG. 8, the above problem is solved by converting only the polarity of the first O current to the opposite polarity (for example, negative polarity).

^ Physically, the second: IO discharge sIs and the second light condition -
Ru. Equipped with a corona discharger control grid for control.

FIG. 4 explains each process step of the apparatus shown in the third figure, and common members and steps in the explanation of the process shown in the first figure are indicated by the same numbers. Therefore, in FIG. 4, the #I■ process is added to the 1st (turn) process and the Klfr9 between the two painters. Therefore, the first button step is carried out as shown in the first figure, and then, in the sixth) step, the control corona discharger σ(12) is applied to the photoreceptor A. A predetermined negative voltage is applied to the discharge line of the third discharge device C' at the power supply B, and a voltage (+800 to 900'V) slightly lower than the surface potential of the photoreceptor is applied to the main discharger G at the power supply Eg. applied.

When the photoreceptor is negatively charged, the potential on the photoreceptor drops to a control grid voltage of 800 to 900 VK. At this time, the toner Tla property on the first layer is converted into a negative value. A KU electric adsorption force is generated between the photoreceptor and the toner T. .

The 20th optical information is irradiated onto the surface of the photoreceptor in the 3rd step, and the 'C development is carried out using the same positively charged developer 11 as in the 2nd step in the next ff) step. As a result, a two-color fox colony was obtained on the photoreceptor. ζ0 As will be described in detail with specific examples, the present invention enables a person to easily form records based on different optical information.

[Brief explanation of the drawing]

Figure 1 (Hiro) is a schematic diagram explaining the method of the present invention, in which a) to (capital) indicate the potting process, column (&) shows the charge change l on the surface of the catfish photoreceptor, and column (b) shows the 70 *Schematic diagram showing Vm potential change, Figure 2 is a diagram showing the present invention Ka〈specific example device explanatory diagram, Figure 3 line,
Based on the present invention (explanatory diagram of different device examples) FIG. 4 is a schematic diagram illustrating an embodiment 11 of the third illustrated device. ...10th party information irradiation light, 6...Kai 2 optical information irradiation light, 4.γ...Developer. (θ) (b) Fig. 4

Claims (1)

[Claims] (1) A first charging step of uniformly charging the photoreceptor to a predetermined polarity potential, a step of irradiating the first optical information to form the 111th column, and 3JgI! a second W charging step of uniformly charging the photoreceptor to the same polar potential as described above; a step of irradiating the 20th party information to form a second latent image;
An electrophotographic device characterized by a step of developing a latent image. (2. In the development set forth in claim 1, the second charging step has a reverse polarity; a step of using Rona discharge to make the potential lower than the surface potential of the O photoreceptor in the first charging step. An electrophotographic method characterized by having the following.