JPS60102659A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To improve durability of a photosensitive body by coating a paint which accelerates ozone decomposition to the inside of a cartridge. CONSTITUTION:A corona discharger 3, a developing device 5 and a cleaning device 7 are made integrally attachable and detachable to and from the main unit of a device together with a photosensitive drum 2 as a cartridge K. The cartridge K is made drawable to the outside by opening a door 19' prior to mounting. The casing of the cartridge K is made of a synthetic resin subjected to coloring for light shielding and is of, for example, ''Noryl'' resin, polycarbonate resin, ABS resin, etc. A resin layer dispersed therein with a material which decomposes ozone is provided on the inside of the casing of the cartridge K by, for example, brushing or dip coating method. The material which accelerates ozone decomposition is, for example, paint consisting of dispersing a reducing agent such as manganese oxide (N), lead oxide, platinum powder, ferrosilicon, sodium sulfide or the like into a binder resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic apparatus using a photoconductive photoreceptor, and in order to decompose ozone that comes into contact with the photoreceptor in R2, the inside of the apparatus, particularly the developer, cleaner, secondary charger, etc. , relates to an electrophotographic device characterized in that a resin layer that promotes ozone decomposition is coated on approximately 10 sides of the inside of a kisotato in which a photoconductor is integrated. Conventionally, a photoconductive photoconductor The Carlson method and the NP method are known as the latent image forming process of the electrophotographic X (device) using electrophotography.
Corona discharge is used to charge the photoreceptor and transfer the toner on the photoreceptor to paper. However, when corona discharge occurs in the air, ozone is generated, and when copies are made continuously, this ozone oxidizes the surface of the photoreceptor, causing a deterioration in the sensitivity of the photoreceptor. there were.

However, the method of providing an ozone decomposition layer inside the charger is less effective because the coating area is small. Furthermore, as the effectiveness diminishes as the number of copies increases, regular maintenance is required, such as replacing the charger, in order to maintain the effect on ozone decomposition.

The present invention provides an electrophotographic apparatus that improves the above-mentioned drawbacks, and is effective in preventing ozone deterioration of the photoreceptor.

Furthermore, since the cartridge is used for replacement after about 3,000 copies are made, the effect of the ozone decomposition layer can be maintained without maintenance.

The device of the invention can contain substances that promote ozone decomposition, e.g.
A paint in which reducing agents such as manganese (N) oxide, lead oxide, platinum powder, ferrosilicon, and sodium sulfide are dispersed in a binder resin is applied inside the device. The area to be applied covers the entire interior of the cartridge.

Any binder resin can be used as long as it has good adhesion to the main body of the device and has good powder dispersibility, but in particular hardening rubber, polyurethane resin, epoxy resin, and acrylic resin can be used. Thermosetting resins such as melamine resins are optimal.

By conventional methods such as dispersion halo mill, ball mill, vibrating ball mill, attritor, sand mill, colloid mill, etc. The application method is by spraying or brushing the inside of the IJ nozzle.

An electrophotographic copying machine loaded with a cartridge will be explained from the front page.

In FIG. 1, an image forming apparatus 1 such as an electrophotographic copying machine, etc.
It is based on an electrophotographic system, and a photosensitive drum 2 is supported at the center of the device so as to be rotatable in the direction of arrow a. A corona discharger 3, a short focus optical element array 4, a developing device 5, a transfer corona discharger 6, a cleaning device 7, and the like are arranged in the same bath of the photosensitive drum 2.

Here, in the illustrated example, the cartridge includes a photosensitive drum A.
2, a corona discharger 3, a developing device 5, and a cleaning device 7 are integrally removable from the main body of the apparatus Ft. 8 is the side plate of the frame that moves these items together. 9 is a reciprocating document table; 10 is a document table illumination unit 7;
11 are transfer material supply trays, 12 is a registration roller, 13 is a conveyance roller, and 14 and 14a are guide members for guiding the transfer material between the transfer corona discharger 6 and the photosensitive drum 2. Furthermore, 15 is a moving path for moving the transfer material after completion of transfer, 16 is a fixing device, 17 is a discharge roller, 18 is a copy tray, and 19 is a color correction filter.

FIG. 2 is a perspective view of the above-mentioned component device, and shows the photosensitive drum 2.
The cartridge K, which integrally includes a corona discharger 3 and the like, is shown in a state where the pre-installation door 19' is opened and the cartridge K is pulled out. However, the figure does not include the cartridge housing.

The image forming operation of the above-mentioned configuration apparatus is as follows.

The photosensitive drum 2 is charged to a predetermined polarity by a corona discharger 3, and then reflected light from an illumination lamp 10 that illuminates the document on the document table 9 is irradiated via the short focus optical element array 4, and the photosensitive drum 2 is charged with a predetermined polarity by a corona discharger 3. 2 Fi, an electrostatic latent image is formed on the surface 1
The formed electrostatic latent image is developed by a developing device 5, and the developed image is transferred onto a transfer material by a transfer corona discharger 6.

The transfer material after the transfer passes through the fixing device jl16 and is discharged to the copy tray 18. On the other hand, photosensitive drum 2 after transfer
The surface is cleaned by a cleaning device 7 and prepared for reuse.

FIG. 3 is a perspective view of the IJ connector itself, taken from the front side when pulled out from the main body of the device.

FIG. 4 is a perspective view of the cartridge inserted into the apparatus main body from the back side.

The housing 20 of the cartridge is made of light-shielding colored synthetic resin, such as Noryl resin, polycarbonate resin, AB.
S resin etc. Also, metal etc. may be used. 5 corona discharge units 1 in this housing 20? ! An opening 21 is provided nearby. The slit-shaped opening 21 is provided substantially parallel to the direction in which the discharge wire of the corona discharger 3 is stretched, and is used for cleaning the wire.

A resin layer in which the aforementioned ozone decomposing substance is dispersed is provided inside the housing 20 of the cartridge by, for example, a brush coating method, a dip coating method, or the like. Further, a substance that decomposes ozone can be dispersed in the aforementioned synthetic resin product that constitutes the housing 20 of the cartridge.

In the opening 21, a colored light-shielding flexible sheet part 2 is provided.
2 is provided so as to be openable and closable, and usually the combustible sheet member 2
The opening 21 is closed by the waist of 2 itself. In other words, if the photoreceptor drum is exposed to external light for a long time, it will deteriorate, and if only the opening position is exposed, the brightness will change compared to other parts of the photoreceptor drum, which will adversely affect image formation. , the above-mentioned configuration of automatically closing the opening 21 except when necessary is effective. In the illustrated example, a 250μ polyester sheet was used to obtain a good shielding effect against dust, light, etc. 1. Also, as will be described later, during cleaning, the I=Jm sheet member 22 is opened only at the insertion part of the cleaning part I. Since the other openings can be kept in a light-shielded state, this is extremely suitable for protecting the photoreceptor drum. Reference numeral 23 indicates a wall surface where the slit-shaped opening 21 is installed.

As shown in FIG. 4, on the back side of the cartridge are a positioning bin 24 for correcting the position of the cartridge loaded in the main unit, and a positioning bin 24 for supplying high voltage to the discharger 3. There is a connector 25, a drive 1L gear 26 for driving the photosensitive drum 2, and a connector 27 for applying a bias voltage to the developing device 5.
6 transmits the driving force of the main body to the drum 2 by fitting the uneven portion with the uneven portion of the drive gear on the main body side.

The final positioning of the cartridge with respect to the main body is achieved by fitting a positioning hole 28 provided on the wall surface opposite to the back wall 8 with a bottle (not shown) on the main body side. . 29 is a photosensitive drum shaft.

Further, the present invention may be applied to a type of electrophotographic copying machine that does not use the cartridge K described above.

At this time, a resin layer in which the above-mentioned substance that promotes ozone decomposition is dispersed can be provided inside the casing of the copying machine by a dip coating method or a dip coating method.

Example 1 As an ozone decomposition accelerating paint, 100 parts of trilead tetroxide (meaning parts by weight; the same applies hereinafter) were mixed with 80 parts of acrylic resin (trade name: Nearcridic A405, manufactured by Dainippon Ink ■) (solid content: 50%). , 20 parts of melamine resin (trade name: Super Beckamine L121, manufactured by Dainippon Ink ■) (solid content: 80%)
) and 100 parts of toluene and then dispersed in a ball mill for 6 hours. Next, a Canon PC
- As a case for the cartridge for 10, the above-mentioned dispersion was
A cartridge was produced by replacing the film with a film thickness of μ. When this cartridge was installed in a PC-IO, a good copy was obtained as the 3000th copy.

Example 2 100 parts of manganese dioxide was mixed with 80 parts of acrylic resin (trade name: Niacridic A405, manufactured by Dainippon Ink ■) (solid content 50%) and 20 parts of melamine resin (trade name: Varnish-Perbeckamin L121, manufactured by Dainippon Ink ■). (solid content 60%
) and 100 parts of toluene and then dispersed in a ball mill for 6 hours, Coating 1 prepared in Examples 1 and 2 was brush applied to the internal plastic part of the cartridge for Gyanon PCIO/20 to a thickness of 10μ. After printing 3,000 consecutive images on each Gyanon PC20 copier, the images were still as clear as the initial image.Also, after 3,000 printings, the deterioration of the sensitivity of the photoreceptor was VL (12lux see) compared to the initial image. ), the increase was 20V in the case of Example 1 and 30V in the case of Example 2, respectively. As a comparative example, we performed continuous transfer durability of 3,000 sheets using the above-mentioned cartridge that does not use paint, and the image after 3,000 sheets of durability was less clear than the initial image.
The sensitivity deterioration of the photoreceptor (c) had increased by 80μ in VL.

As mentioned above, by applying a paint that causes ozone decomposition (M-advanced) inside the cartridge, the durability of the photoreceptor can be improved.1 Also, due to the characteristics of the cartridge,
Since maintenance is not necessary and about 3000 sheets of lKr are replaced, the effectiveness of the osone decomposition layer does not decrease.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a Shigeko photocopying machine based on the present invention, and FIG.
3 is a front perspective view of the cartridge, and FIG. 4 is a rear perspective view of the cartridge. In the figure, 1 is an image forming device, 2 is a photosensitive drum, 3 is a corona discharger, 4 is a short focus optical element array, 5 is a developing device, 6 is a transfer corona discharger, 7 is a cleaning device, 8
1 is a side plate, 9 is a document table, 10 is a document table illumination lamp, 11 is a transfer supply tray, 12 is a registration roller, 13 is a conveyance roller, 14.14B is a guide member, 15 is a moving path, 1
6 is a fixing device iiY, 17 is an ejection roller, 18 is a coheat tray, 19 is a color correction filter, 19' is a door before mounting, 20 is a housing for the cartridge, 21 is a slit-shaped opening, 22 is a diffractive sheet member, Reference numeral 23 indicates a wall surface of the slit-shaped opening installation portion, 24 indicates a bottle, 25 indicates a connector, 26 indicates a drive transmission gear, 27 indicates a connector, 28 indicates a positioning hole, and 29 indicates a photosensitive drum shaft. Figure 1 4a

Claims (3)

[Claims] (1) An electrophotographic apparatus using a photoconductive photoreceptor, characterized in that the apparatus is provided with a resin layer coated with a substance that decomposes ozone dispersed therein. (2) The electronic device according to claim 1, wherein the device including the photoreceptor is a replaceable unit and is a unit device (cartridge) in which the resin layer is applied. Rikishin device. (3) The electrophotographic apparatus according to claim 1, wherein the substance that decomposes ozone is a reducing agent such as manganese oxide, lead oxide, platinum powder, sodium sulfide, or ferrosilicon.