JPH03170565A - Flare-shielding coating material, electronic image-processing apparatus and process cartridge - Google Patents

Abstract

PURPOSE:To obtain a coating material which can absorb a flare and can treat ozone and is useful for an area for shielding a flare by dispersing a black substance for treating ozone in an organic binder. CONSTITUTION:The title coating material is obtained by dispersing 3-100 pts.wt. ozone treating substance which is a black substance which decomposes or adsorbs ozone (e.g. palladium-carbon catalyst comprising a fine carbon powder and at least 0.1wt.% palladium) in 100 pts.wt. organic binder of a solid content of 2-100wt.% (e.g. polyacrylate polymer emulsion) and optionally adding a blowing agent to the dispersion. A coating film of this coating material is formed on a flare-shielding part of an electronic image processing apparatus provided with an image for forming part having an electrostatic application device and the flare-shielding part for shielding a flare to the image forming part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paint for preventing flare light and a process cartridge, and particularly to a paint for preventing flare light and a process cartridge for use in an electronic image processing device.

[Conventional technology]

In an electronic image processing device using an electrostatic application method, ozone is generated from an electrostatic application device such as a charging device, and the ozone concentration inside increases. This ozone forms an oxide film on the surface of the photoreceptor, reducing the sensitivity of the photoreceptor. Such a decrease in the sensitivity of the photoreceptor causes image defects such as image blurring and blurring. In addition, in conventional electronic image processing devices, when the photoreceptor is irradiated with flare light from the exposure section or ultraviolet rays from outside the device, latent image formation may be affected or the characteristics of the photoreceptor may partially change. However, there is a problem in that uneven images are produced.

To prevent this, conventional electronic image processing devices
Installing materials to block flare light and ultraviolet rays,
The members are painted black to prevent light reflection. For example, Japanese Unexamined Patent Publication No. 59-57258 describes a process cartridge in which ventilation portions are formed in a staggered armor plate shape.

[Problem to be solved by the invention]

In the conventional technology, although flare light is blocked by the ventilation section configured in the shape of a mortarboard, ozone is exhausted from the ventilation section. If the ozone concentration in the air increases due to the emitted ozone, it may not have any negative effects on the human body.

Therefore, it is necessary to treat the ozone in the air discharged from the ventilation section, and in the conventional structure described above, a special space is provided within the electronic image processing device, and an ozone filter is placed there.

The first object of the invention is to provide a paint that can absorb flare light and treat ozone. A second object of the invention is to provide an electronic image processing device equipped with a flare light preventing section that can absorb flare light from an exposure section to an image forming section and can also process ozone generated in the image forming section. There is a particular thing.

A third object of the invention is to provide a process cartridge equipped with a ventilation section having the coating film according to the first invention. [Means for Solving the Problems] The paint for preventing flare light 1sJj of the first invention contains a black ozone-treated substance and an organic binder in which the ozone-treated substance is dispersed.

The electronic image processing device of the second invention uses an electrostatic application method.

This electronic image processing device includes an image forming section having an electrostatic application device, and a flare light prevention section for preventing flare light from reaching the image forming section. The flare light prevention portion has a coating film made of the paint according to the first invention.

The process cartridge of the third invention is used in an electronic image processing device using an electrostatic application device. This process cartridge has an image forming section having an electrostatic charge applying device, a ventilation section for discharging airflow from the image forming section into the main body of the electronic image processing device, and houses the image forming section. It is equipped with a case. The ventilation portion is formed in a staggered mortarboard shape and has a coating film made of the flare light prevention paint according to the first invention.

[Effect]

In the first invention, a black ozonated substance is dispersed in an organic binder. This paint forms a black matte coating when applied to a designated area. Therefore, the coating according to the invention can be treated not only by absorbing light but also by decomposing or adsorbing ozone. In the second invention, the flare light prevention portion has the black coating film according to the first invention. As a result, flare light directed toward the image forming section is absorbed. Furthermore, ozone generated in the image forming section is treated by an ozone treatment substance contained in the coating film. This reduces the ozone concentration within the electronic image processing device.

In the third invention, the ventilation portion has a coating film made of the flare light prevention paint according to the first invention.

Therefore, the flare light is sufficiently absorbed in the ventilation section, making it difficult for reflected light to enter the process cartridge. This makes it possible to improve changes in the characteristics of the image forming unit that cause non-uniform images. Furthermore, since the coating film according to the first invention contains an ozone treatment substance, ozone generated in the image forming section is treated when passing through the ventilation section.

〔Example〕

FIG. 1 shows an example in which the present invention is applied to a copying machine.

In FIG. 1, a horizontally movable document table 12 is arranged on the top surface of the copying machine main body 11, and a document table l2
A document holder 13 is attached to the upper part of the document holder 13 so as to be openable and closable. A paper feed cassette 14 is removably attached to the right side of the main body l1 of the copying machine in the figure. A paper discharge tray 18 is installed on the left side of the copying machine main body 11 in the figure, from which copied sheets are discharged.

The interior of the copying machine main body 11 is divided into an upper side and a lower side by a partition plate 3l. The partition plate 3l has a cutout portion 32 at a position facing a ventilation portion 36 of a process cartridge 35, which will be described later. An exposure device 19 for reading the original is provided above the partition plate 3l. This exposure device 19 includes a light source. He has been criticized by Miller and others. An exhaust fan 33 for discharging air from the copying machine main body 11 is provided on the left side of the exposure device 19 in the figure.

An image forming section 10 is arranged in the center of the copying machine main body 11 below the partition plate 31 . A photoreceptor drum 20 on which an electrostatic latent image is formed is arranged at the center of the image forming section 10 . Around the photoreceptor drum 20, there are a charging device 2l that charges the photoreceptor drum 20 to a predetermined charge, a developing device 22 that develops an electrostatic latent image, a transfer device 23 that transfers the toner image onto paper, and a photoreceptor. A paper separation device W24 for separating paper from the drum 20, and a photosensitive drum 2
A cleaning device 25 for removing residual toner on the 0 is arranged.

Between the feeding cassette l-14 and the image forming section l5 and on the downstream side of the image forming section 10, there are provided a paper feed conveyance path 27 and a paper discharge conveyance path 28 for conveying sheets, respectively. A fixing device 30 that fixes the transferred image on the transported paper is arranged between the ejection transport path 28 and the paper ejection tray l8.

In the image forming section 10, the photoreceptor drum 20, the charging device 2l, the developing device 22, and the cleaning device 25 are as follows:
It is housed in a process cartridge 35. Support portions 16 are provided below both side walls of the process cartridge 35.
a, 16b are provided. The support portions 16a, 16b are engageable with guide pieces 17a, 17b provided on the partition plate 3l. Thereby, the process cartridge 35 is held by the partition plate 31 and can be removed from and removed from the partition plate 31.

The process cartridge 35 is provided with a slit 37 above the photosensitive drum 20 through which light from the exposure device 19 passes.

Further, the process cartridge 35 has a ventilation portion 36 facing the cutout portion 32 of the partition plate 31 on the left side of the cleaning device 25 in the drawing. As shown in FIG. 2, the ventilation section 36 is formed by a part of the wall of the process cartridge 35 and a plate 38 arranged parallel to the wall at a slight distance. A large number of holes 39 are formed in a staggered manner in some of these walls and in the plate material 38. Thereby, a ventilation passage bent like an arrow is formed in the ventilation section 36.

A paint film for preventing flare light is formed on a part of the wall of the process cartridge 35 constituting the ventilation section 36 and on the entire surface of the plate material 38. The paint for preventing flare light is one in which an ozonated substance is dispersed in an organic binder, and this is according to the first invention. The ozone treatment substance used in the paint is a black ozone decomposition substance or an ozone adsorption substance. Such ozone decomposition substances include palladium-carbon catalysts or platinum-carbon catalysts prepared by mixing fine carbon powder or activated carbon powder with 0.1% by weight or more of palladium or platinum, platinum-activated carbon catalysts, manganese dioxide, and peroxide. Examples include lead oxide and a mixture of manganese dioxide and a powder of a binary composite oxide consisting of titanium and silicon. In addition, the binary composite oxide powder consisting of titanium and silicon is
When used in combination with manganese dioxide, the ozone decomposition effect increases. Furthermore, examples of the ozone adsorbing substance include activated carbon and fine carbon powder.

The purpose of using the black ozonated substance is to make the coating film matte black. As the organic binder used in the paint, for example, a polymer emulsion such as polyacrylic acid ester, polyvinyl acetate, or polyethylene may be used. These organic binders are usually used so that the binder solid content is 2 to 100% by weight, preferably 5 to 50% by weight.

The mixing ratio of the organic binder and the ozonated substance is desirably 3 to 100 parts by weight, more preferably 5 to 50 parts by weight, per 100 parts by weight of the organic binder. If the amount of the ozone treatment substance is less than 3 parts by weight, a sufficient ozone treatment effect cannot be obtained.

On the other hand, if it exceeds 100 parts by weight, no significant effect will be observed depending on the amount mixed, and the cost will increase. Also,
The paint film may peel off easily.

The paint for preventing flare light may be a foaming paint. A foaming paint is a paint made of the above-described ozone-decomposing substance, an organic binder, and a solvent to which a foaming agent is further added. As the blowing agent, for example, sodium bicarbonate, ammonium carbonate, dinitrosopentamethylenetetra, azobisformamide, azobisisobutyronitrile, barium azodicarboxylate, trihydrazinotri, azine, etc. can be used. Specific examples of foamable paints include the following:

(2) 80 parts by weight of manganese dioxide, 10 parts by weight of butyral resin, and 0.05 parts by weight of ammonium carbonate were dissolved in 10 parts by weight of ethanol.

(2) 95 parts by weight of palladium-carbon powder, 10 parts by weight of butyral resin, and 0.03 parts by weight of dinitrosopentamethylenetetramine were dissolved in 100 parts by weight of ethanol.

■100 parts by weight of mixed powder of binary composite oxide consisting of titanium and silicon and manganese dioxide, and 1 part of acrylic resin.
0 parts by weight and 0.08 parts by weight of asobisformamide dissolved in 80 parts by weight of toluene.

The anti-flare paint is usually applied by spraying, brushing, or using a device such as a coater or a gravure roll. The coating amount is set so that the thickness of the flare prevention coating material is approximately 20 μm. The binder in the applied paint is usually heat treated at 100° C. for about 1 minute. As a result, the ozonated substance is baked and a black matte coating is formed.

In addition, when a foaming paint is used, a porous coating film is formed due to the action of the foaming agent.

Next, the effects of the above embodiment will be explained. The image information from the document table 12 read by the exposure device I9 passes through the slit 37 through the ia! 1 and enters the process cartridge 35. This incident light forms an electrostatic latent image corresponding to the image of the original on the photosensitive drum 20 charged by the charging device 2l. At this time, even if the flare light from the exposure device 19 is irradiated onto the ventilation section 36 of the process cartridge 35, it is absorbed by the black matte coating of the ventilation section 36, so that the flare light does not enter the process cartridge 35. is prevented.

Also, in the image form precept process in the image form precept section IO,
Ozone is generated from the rotating device 21, the transfer device 23, and the paper separating device 24. This ozone-containing air is sucked by the exhaust fan 33 and is then sucked into the process cartridge 35.
It flows inside in the direction of the arrow in FIG. 1 and passes through the ventilation section 36. At this time, ozone in the air comes into contact with the coating film that dominates the ventilation section 36 and is decomposed or adsorbed. For this reason, the ventilation section 36
Ozone in the air discharged into the copying machine main body 11 is efficiently removed, and the ozone concentration in the exhaust gas from the copying machine is reduced.

Note that when a foamable paint is used, the paint film is porous, so the contact area with ozone is increased, and ozone can be removed more efficiently.

[Other Examples]

(a) The flare light prevention paint according to the first invention is:
The black paint may be applied to parts of the copying machine that have been conventionally coated with black paint, such as the surfaces of the cleaning device and the developing device.

(b) The flare light prevention paint according to the first invention is:
The coating may be applied to the entire surface of the copying machine body 11.

In this case, flare light can be absorbed more efficiently and ozone can be removed.

(C) In the above embodiment, the ozone treatment substance was placed on the process cartridge 35 etc. by coating, but the present invention can also be applied when a double-sided tape with the ozone treatment substance adhered in powder form on one side is attached to the process cartridge 35 etc. can be implemented similarly.

(d) The first, second, and third inventions may be applied to an image processing apparatus using an electrostatic application method other than a copying machine, such as a laser printer.

〔Effect of the invention〕

In the first invention, a black matte coating film is formed by the black ozonated substance. Therefore, this coating film can absorb flare light and treat ozone.

In the second invention, the flare light prevention part has 110 made of the paint of the first invention. Therefore, the flare light prevention part can absorb flare light to the image forming part, and Ozone generated in the image forming section can be processed.

The third invention has a coating film made of the flare light prevention paint according to the first invention, and is provided with one ventilation section shaped like a staggered plate. Therefore, flare light is absorbed in the ventilation section, and ozone in the exhaust from the process cartridge is efficiently processed.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a partial sectional view of a ventilation section. 10... Image forming section, l1... Copying machine main body, 21.
...Charging device, 23...Transfer device, 24...Paper separation device, 35...Process cartridge, 36...
Ventilation part, 38... plate material.

Claims (3)

[Claims] (1) A black ozonated substance, an organic binder in which the ozonated substance is dispersed; Paint for preventing flare light. (2) An electronic image processing device using an electrostatic application method, comprising: an image forming section having an electrostatic application device; and a flare light prevention section for preventing flare light from reaching the image forming section; An electronic image processing device, wherein the light prevention portion has a coating film made of the flare light prevention paint according to claim (1). (3) A process cartridge used in an electronic image processing device using an electrostatic application method, comprising an image forming section having an electrostatic application device, and an air flow from the image forming section into the main body of the electronic image processing device. and a case for housing the image forming section, the ventilation section being formed in a staggered armor plate shape and coated with the flare light prevention paint according to claim (1). A process cartridge with a coating film.