JPS5849978A - Image recording device - Google Patents

Abstract

PURPOSE:To record a negative-positive image, a positive-positive image, and a synthetic image, by recording a negative image by the writing due to a red laser light and recording a positive image by the projection of an original optical image through a red filter. CONSTITUTION:In the positive-positve image recording mode, when a photoreceptor 1 is charged with the negative polarity in the dark, an electric double layer is formed through a photoconductive layer 13 because there is the rectifiability for the positive electric charge between a conductive substrate 10 and a photoconductive layer 11. When the photoreceptor is charged secondarily in the dark to neutralize the negative electric charge partially, the state where layers 11 and 13 are charged in directions opposite to each other is realized. Next, when the optical image of an original O is projected onto the photoreceptor 1 through a red filter F1, a reflected light LW from a white ground W of the original O becomes a red light LR, and a part of the photoreceptor corresponding to a nonimaged part is irradiated with this light. The charging state of the layer 11 on the photoreceptor 1 is dissolved, and the surface potential is inverted to the negative polarity again, and the positive-polarity photoreceptor surface potential distribution corresponds to an image part N of the original O. Consequently, the image is developed with a negative-polarity toner to obtain a visible image. Thereafter, the image is transferred and fixed.

Description

[Detailed description of the invention] The present invention relates to a single image recording device.

Forms an electrostatic latent image corresponding to the image to be recorded on a photoconductive photoreceptor, and this electrostatic latent image! (2) An image recording system in which images are converted into images and used for recording is related to copying machines and the like, and an object of the present invention is to provide a novel image recording apparatus in such an image recording system.

According to the image recording apparatus according to the present invention, not only requested positive image recording but also negative-positive image recording and positive-positive and negative-positive composite image recording can be performed. Furthermore, development can be carried out using the same developer as that used for negative-positive and synthetic materials.

One aspect of the present invention will be explained below.

The image recording apparatus of the present invention uses a visible image transfer method, that is,
A method in which an electrostatic latent image formed on a photoconductor is developed to obtain a visible image on the photoconductor, and this visible image is transferred onto a recording medium such as paper, and is characterized by the following points: shall be.

The first characteristic of the present invention lies in the structure of the photoreceptor used.

That is, the photoreceptor used in the image recording apparatus of the present invention has a 1.1 photoconductive layer on a conductive substrate, and further includes:
It has a composite structure in which a second photoconductive layer is provided on the first photoconductive layer with a resin intermediate layer interposed therebetween. The photoconductive layer of 1 is composed of 5eTe K, and the photoconductive layer of N'2 is composed of a charge generation layer and a charge transport layer. The charge generation layer is formed using Se as a charge generation agent, and the charge transport layer is formed using a charge donating substance as a charge transport agent.

The materials of the photoconductive layer and the resin intermediate layer 3.2 are selected so as to transmit red light. When this photoreceptor is irradiated with red light, the photoconductive layer of the spear 1 mainly becomes a conductor.

The second feature lies in the various means for forming an electrostatic latent image on the photoreceptor. That is, the image recording device of the present invention has the following features:
It has a first charging means, a second charging means, a negative image exposure means, a positive image exposure means, and a uniform light irradiation means.

The first charging means is for negatively charging the photoreceptor. As the charging means, a corona charger such as a & corotron, scorotron, etc. is used. This primary charging with negative polarity is a step in the latent image forming process.

The j/2 charging means is for applying secondary charging of positive polarity to the photoreceptor after primary charging, and specifically, a corona charger such as a corotron or scorotron is used. Note that this 1F2F2 charged film is.

The photoconductor is configured to be irradiated with light at the same time as being charged. The positive secondary charging by the second charging means is the second step in the latent image forming process.

The negative image i light means is for exposing the photoreceptor to a negative image with red light. Here, negative image exposure is an exposure method that irradiates a portion that should be one image area with red light. Specifically, it involves projecting a negative image light image through a red filter or using a red laser beam. Methods such as writing are used.

The positive image exposure means is for exposing the photoreceptor to a positive image of red light. Positive image exposure is an exposure method that leaves the image area and irradiates the non-image area, that is, the background area of the recorded image, with red light. Specifically, a red filter is used. Techniques such as projection of a positive image light image through a laser beam or writing with a red laser beam are used.

The uniform light irradiation means is for uniformly irradiating the photoreceptor with red light between the positive image exposure section and the development section.

When positive-positive image recording is performed, primary charging and secondary charging are performed in the dark, and then positive image exposure is performed to form an electrostatic latent image.

In this recording mode, negative image exposure and uniform light irradiation with red light are not performed.

When negative-positive image recording is performed, primary charging is performed in the dark, then secondary band and negative image exposure are performed simultaneously, and finally uniform light irradiation with red light is performed. An electrostatic latent image is formed. In this recording mode,
When positive image exposure is performed and negative-positive and positive-positive image synthesis recording is performed at 11 to 5, primary charging is performed in the dark, and then secondary charging and negative image exposure are performed simultaneously. Then, when positive image exposure is performed, an electrostatic latent image is formed. In this recording mode, uniform light irradiation with red light is not performed.

Note that in one or more of the descriptions, rectification is assumed between the conductive substrate and the photoconductive layer of the photoreceptor. If such rectification is not present, primary charging may be performed under uniform irradiation with red light.

Before going into specific explanations, some of the specific materials of each part constituting the photoreceptor will be listed here.

First, the conductive substrates are /J, Cu, and Houtou.

Various metals such as Fe, or 5n02, In2
O5, CuI.

Metal compounds such as CrO2 can be used as the material. That is, these materials can be used by binding them into a plate shape, or by forming a thin layer of the above materials on paper, cloth, plastic film, etc. by sputtering or the like.

Next, 5eTe is used as the material for the light guide 1' layer of the fang 1. Appropriate Te content is about 4 to 12V11. The alloy may further contain up to 100 ppm OCA'. Such materials can be deposited onto the conductive substrate to form the photoconductive layer of spear 1. In addition, as a special case.

The 1t1 photoconductive layer may be a composite of a Se layer and a 5eTe sensitizing layer on the Ss layer.

When depositing a layer of 5eTe, the deposition rate is 2
~5 m/min is appropriate, and in that case, the above-mentioned rectification property can be obtained by setting the base temperature to 60 to 95 degrees. The thickness of the photoconductive layer of spear 1 is 30 to 70μ
m is preferred.

The resin intermediate layer has a function as a current blocking layer, and its materials include polyethylene, lyric acid ester polymer or copolymer, polycarbonate, xylene resin, and cellulose resin.

Various resins such as fluororesin can be used.

The thickness of the resin intermediate layer is 3 IIm or less.

Next is the photoconductive layer in Part 2, which is composed of a charge generation layer and a charge transport layer as described above. f[M
'A'JE, Ji@Tn l bl, l@0.1~3.
. , □ consists of an amorphous layer of Se. The charge transport layer is made of an electron-donating substance bound with a resin binder. The thickness of the photoconductive layer of spear 2 is 10 to 30 μm.

As the electron-donating substance, for example, a compound having a nitrogen-containing cyclic compound such as hexamethylene diamine, triphenylmethane, triphenylamine:durene, or poly-N-vinylcarbasol, polypyrene, polyvinylanthracene, etc. may be used. I can do it.

The binder resin may be polyethylene, for example.

Polystyrene, polybutadiene, polyester resin, epoxy resin, urethane resin, silicone resin, acetal resin, etc. can be used.

Further, it can be used in combination with the above-mentioned binding resin containing plasticizers such as dibutyl phthalate and dioctyl phthalate.

In this case, the plasticizer is used for the binder resin.

It is appropriate that the weight ratio is 30 or less.

A detailed description will be given below with reference to the drawings.

Figure 1 shows an embodiment of the present invention in an explanatory diagram with only the parts necessary for explanation simplified.

In this example arrangement, negative image exposure is performed by writing with red laser light, and positive image exposure is performed by projecting a light image of the original through a red filter.

In the figure, reference numeral 1 indicates a photoreceptor. A rectifying property for positive charges is provided between the photoconductive layer 1.1 of the photoreceptor 1 and the conductive substrate.

The photoreceptor 1 is formed into a drum shape and is rotatable in the direction of the arrow. A charger 2,
Charger 3, filter F1.

Lamp 4. Filter F2, developing device 5. A transfer charger 6, a static elimination lamp 7, and a cleaning device 8 are provided in a body surrounding the photoreceptor 1, as shown in FIG. The charger 2 is a first charging means, and the charger 3 is a first charging means.

The symbol indicates a red laser beam for negative image calculation. In this case, as the negative image 4-light means, a laser writing device or the like known in connection with printers or the like is used.
I can be there. On the other hand, as a positive image exposure means,
A known exposure optical system for copying machines can be used together with filter F1. Filter F'1, F
2 are both red filters, and lamp 4 is a uniform
It is a white light lamp for light irradiation. That is, the lamp 4 and the filter constitute uniform light irradiation means.

The developing device 5 is of a dry type developing type, and uses toner having a negative polarity band. of course.

In place of the developing device 5, a wet developing type device may be used.

t-1-' - A general explanation of image recording by this device will be given.

When the device is activated, the photoreceptor 1 rotates in the direction of the arrow, and at the same time, the static elimination lamp 7 emits light and the cleaning device 8 is activated.

When the photoreceptor portion, which has been neutralized by the static eliminating lamp 7 and cleaned by the cleaning device 8, enters the charging area by the charger 2, an electrostatic latent image forming process is started. An electrostatic latent image is formed on the photoreceptor 1 between the charger 2 and the lamp 4, and is developed by the developing device 5.

The visible image thus obtained on the photoreceptor 1 is then transferred to a recording medium S such as plain paper by a transfer charger 6.
transferred to the top. The recording medium S is.

Thereafter, a visible image is fixed in a first printing device (not shown) and discharged as a record out of the device. After that, the photoreceptor 1 is destaticized and cleaned.

The recording process ends.

The process of forming a silent latent image in each recording mode will be explained below.

2 is an explanatory diagram of the positive image recording mode.

In the case of the example shown in Figure 1.1, the positive image recording mode is a process of copying a positive recorded image from a document having a positive image.

In Figure 2 (1), symbol ]0 is the conductive substrate of the photoreceptor 1, symbol 11 is the photoconductive layer of the spear 1, symbol ]2 is the resin intermediate,
1. Reference numeral 13 indicates the photoconductive layer of the spear 2, respectively.

When this photoreceptor 1 is turned to negative polarity in the dark by a charger 2, the conductive substrate 10 and the spear 1
Since there is a rectifying property for positive charges between the photoconductive layer 11 and the photoconductive layer 11, an electric double layer is formed via the photoconductive layer 13, as shown in Fig. 2 (1). This state is called light guide if,H
It is said that A13 was charged.

It was also carried out in the dark, and one of the negative charges due to primary charging was
When the photoconductive layers 11 and 13 are neutralized, a state is realized in which the photoconductive layers 11 and 13 are charged in opposite directions, as shown in Figure 2 (1) Vr-. This secondary charging is performed so that the surface potential of the photoreceptor is reversed from negative polarity to positive polarity after the secondary charging.

Then, the optical image of the original O is projected onto the photoreceptor 1 via the red filter F1 (Figure 1 (I)).

The reflected white light LW from the white background portion W of the original O is passed through the filter F1 to become red light LR, which irradiates the photoreceptor portion corresponding to the non-image portion. However, when the photoconductor 1 is irradiated with the red light LR, mainly the photoconductive layer 11 of the photoconductor 1 becomes a conductor, so that the charged state of the photoconductive layer 11 is eliminated in the photoconductor portion corresponding to the non-image area. However, the photoreceptor surface potential is again reversed to negative polarity. Thus, if the electrostatic latent image, that is, the surface potential distribution of the positive photoreceptor surface is developed with the negatively charged toner T (Fig. 3.1).
IV) ), a visible image is obtained on the photoreceptor 1. later.

This visible image may be transferred and fixed onto the recording medium S.

In addition, in Figure 1 (fV), the symbol ■○ in photoreceptor 1
indicates the polarity of the surface potential of each photoreceptor site. Figure 1 (V) schematically shows changes in the surface potential of the photoreceptor in the above process. The song mz-x, 2-2 in the positive image fungus area.

Each shows a change in the photoconductor surface potential at a photoconductor site corresponding to an image area and a photoconductor site corresponding to a non-image area.

, 1-3 are diagrams for explaining the electrostatic latent image forming process in the negative-positive image recording mode.

In this case, first, primary charging is performed in the dark to charge the photoconductive layer 13 and make the photoreceptor surface potential negative (
Figure 3 (I)).

Next, by writing with a red laser beam (K), negative image exposure and secondary charging are performed simultaneously in row 1 (Figure 3 (1)).
) Then, the photoconductive layers 11 and 13 are charged at the photoconductive layers 11 and 13 in the photoconductor parts that are not irradiated by the laser beam LK, and the photoconductor surface potential is reversed to positive polarity at these parts. On the other hand, in the part of the photoreceptor irradiated with the laser beam L, the photoconductive layer 11 becomes a conductor, so the direction of primary charging of the photoconductive sleeve layer 13 is reversed, and this part is also photosensitive. The body surface potential is reversed to positive polarity.

Due to the nature of corona charging, the p-plane potential of the photoreceptor is uniform throughout after this secondary charging.

In addition, red light is uniformly irradiated onto the photoreceptor 1 by the lamp 4 and filter F2 (>1 figure), with the laser beam irradiated area being applied to the image area, and the unirradiated area being non-irradiated. )). Then, in the photoreceptor part corresponding to the non-image area, the photoconductor W
11], its charged state disappears as it becomes a conductor,
The photoreceptor surface potential is reversed to negative polarity. On the other hand, in the part of the photoreceptor corresponding to the first image area, the charged state of the photoconductive layer 11 has disappeared due to the negative image exposure at the same time as the secondary charging, so the photoconductive layer becomes electrically conductive in this part. No change occurs, and therefore the photoreceptor surface potential at this location remains positive.

Therefore, the surface potential distribution of this positive polarity photoreceptor.

The image can be visualized using negatively charged toner T (see Figure 3 (IV)), and the resulting visible image is transferred and fixed onto a recording medium S.

A positive recorded image can be obtained in contrast to negative image exposure.

bu=;”, nee mJtlcQ-=22223-1.
3-2 shows changes in the surface potential of the photoreceptor in areas that were not irradiated with light and areas that were irradiated with light during negative image fog light, and curve 3-3 in the uniform light irradiation area corresponds to the image area, curve 3-3. 4 is the non-image area.

Figure 4 is a diagram for explaining the positive-positive and negative-positive image composition recording modes.

In this case, first, photoconductivity I! is caused by primary charging. 1i13
1.4 (1) ), then the secondary band, ′
Also, negative image exposure using the laser beam L is performed at the same time (Fig. 4 (1)). The steps up to this point are the same as in the negative-positive image recording mode. Then, as shown in FIG. 4, the optical image of the original O' is projected onto the photoreceptor l via the filter F1.

Then, the portion of the photoreceptor corresponding to the non-image portion W' of the document σ is uniformly irradiated with red light LR. The effect of this uniform irradiation was explained earlier. The effect is the same as that of uniform light irradiation in the negative-positive image recording mode, and the surface potential of the photoreceptor is
The photoreceptor surface potential remains positive as after secondary charging, and the surface potential of the photoreceptor is reversed to negative polarity in other parts. On the other hand, the portion of the photoreceptor corresponding to the image portion of the original σ is not exposed to light.

The 11th position on the surface of the photoreceptor remains positive as after secondary charging.

Therefore, the surface potential distribution of the positive photoreceptor is changed to the negatively charged toner T.
When developed, a composite visible image of the image corresponding to the negative image exposure can be obtained. All that is left to do is to transfer this composite visible image onto the recording medium S and fix it.

FIG. 4(V) shows the above process. This diagram schematically shows changes in the surface potential of a photoreceptor. Curves 4-1 and 4-2 in the negative image exposure area are regions that were not irradiated with the laser beam L, respectively.

Shows changes in potential on the surface of the photoreceptor at the irradiated area.

Further, the curve 4-4 in the positive image exposure area shows the potential change in the non-image area, and the curve 4-3 shows the potential change in the image area.

[Brief explanation of drawings]

3.1 is an explanatory front view showing one embodiment of the present invention,
Fig. 112 is a diagram for explaining the positive-positive image recording mode, Fig. 3 is a diagram for explaining the negative-positive image recording mode, and Fig. 4 is a diagram for explaining the positive-positive, negative-positive image composition, and recording mode. This is a diagram for DESCRIPTION OF SYMBOLS 1... Photoreceptor, 10... Conductive substrate, 11... 3
411 photoconductive layer, 12... resin intermediate layer, 13...
・tsu・2 photoconductive layer, 2゜3...charger, Fl
, F2...filter, 4...lamp, 5...
- Developing device procedural amendment (October 22, 1980 1 Display of the case 1982 Patent Application No. 147553 2 Name of the invention Image recording device '3 Person making the amendment Relationship with the case Patent applicant's office 1-3-6 Nakamagome, Ota-ku, Tokyo Name (6)
74) Ricoh Co., Ltd.-4 Agent 156 Address 2-6-28-6 Sakuragaoka, Setagaya-ku, Tokyo
Contents of the amendment (1) The six characters ``an example of'' are added between ``process'' and ``wo'' on the second line from the bottom on page 11 of the specification. (2) Next to "Iru." on the bottom line of the specification No. 1700,
Add the following text. "In any recording mode, it is not necessary to reverse the potential of the non-image area to negative polarity, and it is sufficient to simply attenuate it to around 0." (6) Figure 4 of the drawing is separate. Correct as shown.

Claims (1)

[Claims] A first photoconductive layer made of 5eTe is provided on a conductive substrate, and a charge generation layer containing Se as a charge generation agent is placed on this first photoconductive layer via a resin intermediate layer. and a photoconductive layer comprising a charge transport layer containing a charge donating substance as a charge transport agent. A first charging means for performing primary charging of negative polarity on the photoreceptor, and a second charging φ stage and secondary charging for performing secondary charging of positive polarity on the photoreceptor; a negative image exposing means capable of exposing the photoreceptor to a negative image with red light; and a negative image exposing means capable of exposing the photoreceptor to a positive image with red light after secondary charging;
and a uniform light irradiation means developing device capable of uniformly irradiating the photoreceptor with red light between the positive image exposure section and the development section. image recording device.