JP2000075624A - Developing device, developing cartridge and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a filter member hard to be clogged and to prevent it from being damaged by forming one or more holes at a cover member fitted with the wall surface or the filling port of a developing container and fitting the filter member whose ventilation value is specified to the hole. SOLUTION: This developing device is provided with a through-hole at the side surface 100a of a toner container 100 in the longitudinal direction as the filling port 101 for filling toner. The port 101 functions as through-hole for relieving air in the container 100 outside. Then, a cap 102 being as the cover member covering the port 101 is press-fitted with the port 101. Besides, one or more holes are made to pierce through the cap 102 as the pressure relieving part 102a. Then, the filter 103 being as a filter member whose ventilation degree obtained by the testing method of JISP 8117 is 4 sec is fitted to the relieving part 102a so as to prevent the toner in the container 100 from being leaked outside from the relieving part 102a. The filter 103 is constituted of a sheet-like porous material and fitted to the cap 102 so as to cover the relieving part 102a by being thermally welded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic image forming apparatus such as an electrophotographic copying machine or an electrophotographic printer, a developing device used in the electrophotographic image forming apparatus, and a developing cartridge.

[0002]

2. Description of the Related Art Conventionally, as a configuration of an image forming apparatus for forming a multicolor image by an electrophotographic method, a developer (hereinafter, referred to as "toner") having a different color is applied to a photosensitive drum as an electrophotographic photosensitive member, that is, an image carrier. Are disposed on a rotation selection mechanism, the electrostatic latent image formed on the photosensitive drum is visualized as a toner image by the developing device, and the toner image is transferred to a recording medium. A configuration has been proposed in which a multicolor image is obtained by performing these development and transfer operations on a plurality of colors. In addition, there is a cartridge configuration in which the developing device is detachable from the image forming apparatus so as to reduce maintenance work for a user.

In such a developing device, a toner application roller having a sponge roll attached to a metal core is used to supply toner in a toner container (developing container) to a developing roller serving as a toner carrier. In general, the roller is pressed against a roller and rotated.

In such a toner supply configuration, as the developing roller and the toner applying roller rotate, the air pressure in the toner container increases, and air escapes from a portion where the seal strength is weak.

At this time, in order to prevent the toner in the toner container from leaking out together with the air, a hole as a pressure release portion for releasing the air in the toner container to the outside is provided. A filter is attached so that only air can escape.

[0006]

However, in the conventional developing device, the filter is liable to be clogged with toner or the like during a long-term use, and the pressure is applied to the filter by movement in the toner container during the distribution process. The filter may be damaged when the filter is hit or an object collides from outside the toner container.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a developing device, a developing cartridge and an image forming apparatus which are less likely to cause clogging of a filtering member attached to a hole of a developing container and which can prevent damage to the filtering member. is there.

[0008]

The above object is achieved by a developing device, a developing cartridge and an image forming apparatus according to the present invention. In summary, the present invention relates to a developing device having a developing container for storing a developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port. The lid member that fits into the wall surface of the container or the filling port has one or more holes, and the holes have an air permeability of 5 seconds.
(c) a developing device comprising:

According to another aspect of the present invention, there is provided a developing container for storing a developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port. In a developing device mounted on a rotation selection mechanism of an electrophotographic image forming apparatus, the filling port is provided on a wall surface of the development container in a direction perpendicular to a rotation axis of the rotation selection mechanism, and the lid member is provided with one or more lid members. And a filter member having an air permeability of 5 seconds or less is attached to the hole.

According to another aspect of the present invention, in a developing cartridge having at least a developing device and detachably mounted on an image forming apparatus main body, the developing device includes a developing container for storing a developer. Having a filling port for filling the developing container with a developer, and a lid member fitted to the filling port, wherein at least one lid member fitted to the wall surface of the developing container or the filling port is provided. Having a gas permeability of 5
A developing cartridge provided with a filter member for no more than sec.

Further, according to another aspect of the present invention, in a developing cartridge having at least a developing device and detachably attached to an image forming apparatus main body, the developing device includes:
A developing container for storing the developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port, wherein the filling port has a rotating shaft of the rotation selecting mechanism. The developing cartridge is provided on a wall surface of the developing container in a direction perpendicular to the developing cartridge, wherein the lid member has one or more holes, and a filtering member having an air permeability of 5 sec or less is attached to the holes. Provided.

According to another aspect of the present invention, a developing container for storing a developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port are provided. In the image forming apparatus provided with the developing device, the lid member fitted to the wall surface or the filling port of the developing container has one or more holes, and a filtering member having an air permeability of 5 sec or less is attached to the holes. An image forming apparatus is provided.

Further, according to another aspect of the present invention, there is provided a developing container for storing a developer, a filling opening for filling the developing container with the developing agent, and a lid member fitted to the filling opening. In the image forming apparatus having a developing device mounted on a rotation selection mechanism, the filling port is provided on a wall surface of the development container in a direction perpendicular to a rotation axis of the rotation selection mechanism, and the lid member has one or more holes. An image forming apparatus is provided, wherein a filtration member having an air permeability of 5 sec or less is attached to the hole.

In the above invention, it is preferable that the filling port is arranged at a position where the lid member is not buried by a developer during development. The filter member is fixed by ultrasonic welding or heat welding from the inside of the lid member, and the outer surface of the filter member contacts the lid member except for a welded portion and the periphery of the filter member and the lid member. It is preferable to have a step so as not to cause a problem. It is preferable that the lid member has a through hole and a radial or lattice-shaped rib. It is preferable that a rib is provided on the cover member around the filter member in order to prevent the filter member from peeling off.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a developing device, a developing cartridge and an image forming apparatus according to the present invention will be described in more detail with reference to the drawings.

Embodiment 1 [Overall Description of Image Forming Apparatus] First, the overall configuration of a color image forming apparatus will be schematically described with reference to FIG. FIG. 1 shows a color laser printer which is an embodiment of a color image forming apparatus.

As shown in FIG. 1, the color laser printer includes an image carrier (photosensitive drum) 2 which rotates at a constant speed.
1, an image forming unit including a fixed black developing device 30B and a rotatable three-color developing device (yellow developing device 29Y, magenta developing device 29M, cyan developing device 29C), and image forming. The intermediate transfer body 33 holds the color image developed and multi-transferred by the transfer unit, and further transfers the color image to the transfer material 19 fed from the transfer material feeding unit. The transfer material 19 on which the color image has been transferred from the intermediate transfer body 33 is conveyed to the fixing unit 44 and is fixed on the transfer material 19, and the discharge unit 4 on the upper surface of the apparatus is driven by the discharge rollers 16, 17 and 18.
Discharge to 9.

The three color developing device and the fixed type black developing device are individually detachable from the printer main body as a developing cartridge.

Next, the configuration of each section of the image forming apparatus will be described in detail sequentially.

[Image Carrier Unit] Image Carrier Unit 2
Numeral 0 indicates that the image carrier 21 and the container 22 of the cleaning device also serving as a holder for the image carrier 21 are integrally formed. The image carrier unit 20 is detachably supported by the printer main body, and is configured so that the unit can be easily replaced according to the life of the image carrier 21.

The image carrier 21 according to this embodiment has a diameter 62
mm of an aluminum cylinder is coated with an organic photoconductor layer on the outside thereof.
It is supported rotatably.

On the periphery of the image carrier 21, a cleaner blade 23 and primary charging means 24 are arranged.
By transmitting the driving force of a driving motor (not shown) to one end of the image bearing member 1, the image carrier 21 is rotated counterclockwise in the figure according to the image forming operation.

[Charging Means] The primary charging means 24 is a conductive roller using a contact charging method. The conductive roller is brought into contact with the image carrier 21 and an image is formed by applying a voltage to the conductive roller 24. This is to uniformly charge the surface of the carrier 21.

[Exposure Means] Exposure to the image carrier 21 is performed from the scanner unit 25. That is, when an image signal is given to the laser diode, the laser diode irradiates the polygon mirror 26 with an image corresponding to the image signal.

The polygon mirror 26 is a scanner motor 26
a, the image light reflected by the polygon mirror 26 selectively exposes the surface of the image carrier 21 rotating at a constant speed via the imaging lens 27 and the reflection mirror 28, and as a result, the image carrier An electrostatic latent image is formed on 21.

[Developing Means] The developing means serves to make each of the yellow (Y), magenta (M), cyan (C), and black (B) colors as described above in order to visualize the electrostatic latent image. Three rotary developing devices 29Y, 29M, 2
9C and one black developing device 30B.

The black developing device 30B is a fixed developing device.
A developing roller 30BS, which is a toner carrier, is provided at a position facing the image carrier 21 at a minute interval (30
(Approximately 0 μm), and a developing bias is applied to the developing roller 30BS, whereby the surface of the image carrier 21 is visualized as a toner image.

The black developing device 30B feeds the toner in the container to the developing roller 30BS by a feeding mechanism, and the toner is applied to the outer periphery of the developing roller 30BS rotating clockwise in the figure by the coating blade 30BB pressed against the outer periphery of the developing roller 30BS. Is applied in a thin layer, and a charge is applied to the toner (frictional charging).

Three rotating developing devices 29Y, 29M, 29
C includes toner equivalent to 6000 pages (A4, 5% printing), and is detachably held as a developing cartridge on a developing rotary 32 which is a current rotation selecting mechanism that rotates about a shaft 31.

At the time of image formation, each developing device is rotated around a shaft 31 while being held by a developing rotary 32, a predetermined developing device is stopped at a position facing the image carrier 21, and a developing roller is further moved. After being positioned so as to face the image carrier 21 with a small interval (about 300 μm), a visible image is formed corresponding to the electrostatic latent image on the image carrier 21.

When forming a color image, one of the intermediate transfer members 33
The developing rotary 32 rotates with each rotation, and the yellow developing device 29Y, the magenta developing device 29M, and the cyan developing device 29
C, and then the developing process is performed in the order of the black developing device 30B.

FIG. 2 shows a state in which the yellow developing device 29Y is positioned and stationary at a position facing the image carrier unit 20. The yellow developing device 29Y sends the toner in the toner container 100 to the coating roller 29YR by a feeding mechanism 29YT, and serves as a regulating member pressed against the outer periphery of the coating roller 29YR rotating clockwise in the drawing and the developing roller 29YS as a toner carrier. The developing roller 29 is rotated in a clockwise direction in FIG.
A thin layer of developer is applied to the outer periphery of 9YS, and a charge is applied to the toner (frictional charging).

By applying a developing bias to the developing roller 29YS facing the image carrier 21 on which the latent image is formed, toner development is performed on the image carrier 21 in accordance with the latent image.

In the magenta developing device 29M and the cyan developing device 29C, developer development is performed by the same mechanism as described above.

Each of the rotary developing devices 20Y, 20M, 20
When each developing device is rotated to the developing position, each developing roller of C is connected to a high-voltage power supply for developing each color provided in the printer main body and a driving source, and a voltage is selectively selectively applied to each developing color. Is applied to transmit the drive.

[Intermediate Transfer Body] The intermediate transfer body 33 transfers the toner image on the image carrier 21 visualized by each developing device four times (each of four colors of Y, M, C, and B) during a color image forming operation. Image carrier 2)
1 in a clockwise direction in synchronization with the outer peripheral speed.
Further, the intermediate transfer body 33 that has received the multiple transfer transfers the transfer material 2 between the transfer rollers 34 to which a voltage is applied, and conveys the developer images of the respective colors on the intermediate transfer body 33 onto the transfer material 2 at the same time. I do.

The intermediate transfer member 33 according to the present embodiment has a diameter of 1
The outer circumference of an 86 mm aluminum cylinder 35 is covered with an elastic layer 36 of medium resistance sponge, medium resistance rubber or the like. The intermediate transfer member 33 is rotatably supported, and is rotated by being driven by a gear (not shown) fixed integrally.

[Cleaning Unit] The cleaning unit is configured to transfer the toner visualized on the image carrier 21 by the developing unit to the intermediate transfer member 33 and then transfer the toner to the image carrier 21.
This is for cleaning the toner remaining on the top. The removed toner that has been cleaned is stored in the cleaner container 22. The amount of the removed toner stored in the container 22 does not fill the container 22 earlier than the life of the image carrier 21.
Therefore, when the life of the image bearing member 21 is replaced, the container 22 is simultaneously replaced.

[Sheet Feeding Unit] The sheet feeding unit feeds the transfer material 19 to the image forming unit, and includes a cassette 37 containing a plurality of transfer materials 19, a feed roller 38, a feed roller 39,
It mainly includes a retard roller 40 for preventing double feed, a paper feed guide 41, a transport roller 43, and a registration roller 42.

At the time of image formation, the feed roller 38 is driven to rotate in accordance with the image forming operation, and the transfer material 1 in the cassette 37 is rotated.
9 are separated and fed one by one, guided by a guide plate 41, and reach a registration roller 42 via a transport roller 43.

During the image forming operation, the registration rollers 42
Non-rotational operation of making the transfer material 19 stand still and the transfer material 1
The rotation of the transfer material 9 toward the intermediate transfer body 33 is performed in a predetermined sequence, and the position of the image and the transfer material 19 at the time of the transfer process, which is the next process, is aligned.

[Transfer Section] The transfer section is composed of a swingable transfer roller 34. The transfer roller 34 has a metal shaft wound with a medium-resistance foam elastic material, and is movable up and down in the figure and has driving. .

While the four-color toner image is being formed on the intermediate transfer member 33, that is, while the intermediate transfer member 33 is rotated a plurality of times, the transfer roller 34 is indicated by a solid line in the drawing so as not to disturb the image. It is located below and separated from the intermediate transfer member 33.

After the formation of the four color toner images on the intermediate transfer body 33, the transfer roller 34 is shown by a thin line in the figure by a cam member (not shown) in accordance with the timing of transferring the color image onto the transfer material 2. At the upper position, it is pressed against the intermediate transfer body 33 via the transfer material 19 with a predetermined pressure. At this time, a bias is simultaneously applied to the transfer roller 34, and the toner image on the intermediate transfer body 33 is transferred to the transfer material 19.

Here, since the intermediate transfer member 33 and the transfer roller 34 are driven respectively, the transfer material 19 sandwiched between the two is subjected to a transfer process and at the same time, at a predetermined speed in the left direction in the figure. And is sent to the fixing unit 44 which performs the next process.

[Fixing Section] The fixing section 44 includes a developing device 29,
A fixing roller 45 for applying heat to the transfer material 19, as shown in FIG. 1, fixes the toner image formed on the transfer material 19 through the intermediate transfer body 33. And a pressure roller 46 for pressing the transfer material 19 against the fixing roller 45. Each roller 4
Reference numerals 5 and 46 denote hollow rollers, each of which has a heater 4 inside.
7 and 48, and is configured to be driven to rotate and to convey the transfer material 19 at the same time.

That is, the transfer material 19 holding the toner image is conveyed by the fixing roller 45 and the pressure roller 46, and the toner is fixed to the transfer material 19 by applying heat and pressure.

Next, the structure of the developing device, which is a feature of the present invention, will be described mainly with reference to FIG. 3 using the yellow developing device 29Y as a representative example.

In the developing device 29Y, a through hole is provided as a filling port 101 for filling the toner in the longitudinal side surface 100a of the toner container 100 shown in FIG. The toner filling port 101 also functions as a through hole for letting out the air inside the toner container 100 to the outside, and a cap 102 as a lid member that covers the toner filling port 101 is press-fitted.

When the inner pressure of the toner container 100 is increased by the rotation of the coating roller 29YR and the developing roller 29YS in FIG. 2, a cap is provided to release air to the outside and reduce the internal pressure to prevent leakage of toner. 102
Is provided with one or more holes as pressure relief portions 102a.

Further, the depressurizing portion 102a has a JISP
A filter 103 as a filter member having a gas permeability of 4 sec according to the test method of 8117 is attached to prevent the toner in the toner container 100 from leaking out of the pressure relief portion 102a.

The filter 103 is made of a sheet-like porous material, and is heat-sealed, adhered to the cap 102.
Alternatively, it is attached so as to close the pressure relief portion 102a with an adhesive tape or the like.

As described above, according to the present embodiment, the cap 102 is fitted into the toner filling port 101 of the toner container 100, the hole 102a is provided in the cap 102, and the filter 102 having the air permeability is provided in the hole 102a. By attaching 103, clogging of the filter 103 hardly occurs,
Further, it is possible to prevent the filter 103 from being damaged.

Embodiment 2 Next, a second embodiment of the present invention will be described mainly with reference to FIGS.

This embodiment is also described in the first embodiment, and as shown in FIG. 4, along the longitudinal side of the toner container 100, that is, in the direction of the axis 31 of the rotary unit 32 as a rotation selection mechanism. A toner filling port 101 is provided on a wall surface 100a perpendicular to the wall. This toner filling port 1
Reference numeral 01 also functions as a through-hole for letting out the air in the toner container 100 to the outside.
02 is press-fitted. When the internal pressure of the toner container 100 increases due to the rotation of the coating roller 29YR and the developing roller 29YS, the air is released to the outside to reduce the internal pressure, and the cap 102 shown in FIG. One or more holes are provided as pressure relief portions 102a.

Further, the depressurizing portion 102a has a JISP
Filter 1 with air permeability of 4 sec according to the test method of 8117
03 is attached to prevent the toner in the toner storage unit from leaking out of the pressure release unit.

The filter 103 is made of a sheet-like porous material, and is heat-sealed, adhered to the cap 102.
Alternatively, it is attached so as to cover the pressure relief portion 102a with an adhesive tape or the like.

As shown in FIG. 4, a developing device 29Y,
29C and 29M are mounted on the developing rotary 32 around the rotation center axis 31 respectively, and when the developing device rotates while being held by the developing rotary 32 during image formation, the developing rotary 32 The powder pressure of the toner is applied to the plane parallel to the rotation center axis 31 (the plane parallel to the longitudinal direction) by the centrifugal force, but the rotation center axis 31 of the rotary unit 32 as in this embodiment.
The toner powder pressure is less likely to be applied to the wall surface 100a perpendicular to the vertical direction.

Therefore, the toner filling port 10 is provided on the wall surface 100a.
1 and the cap 102 is fitted into the toner filling port 101 as shown in FIG.
The pressure relief part 102a provided in the above was configured to be at the above position. Therefore, the filter 103 attached to the pressure relief part 102a is not damaged by the toner powder pressure.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the developing device 29Y shown in FIG.
Are mounted on the developing rotary 32 around the rotation center axis 31, respectively, are rotated while the developing device 29 </ b> Y is held by the developing rotary 32 during image formation, and are set at a developing position facing the image carrier 21. FIG. 6 shows the developing device at the developing position.

Since the internal pressure of the toner container 51 is increased by the rotation of the developing roller 29YS and the toner applying roller 29YR during development, the JISP 811 is used to release the internal pressure.
The toner filling port 101, that is, the through hole is arranged at a position where the cap 102 provided with the filter 103 having the air permeability of 4 sec according to the test method 7 is not completely buried in the toner 60 stored in the toner container 100. .

As a result, the internal pressure of the toner container 51 becomes
Can be missed without being disturbed by toner.

Embodiment 4 Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, a filter 103 having a permeability of 4 sec according to the test method of JISP8117 is fixed to the cap 102 fitted to the toner filling port from the inside of the cap 102 by ultrasonic welding or heat welding. The filter 103 and the cap 1
02 is the filter 103 except for the welded portion and its surroundings.
Step 102 so that the cap 102 does not touch the
c to secure an effective area of the filter 103, and
The configuration is such that it can withstand the strength.

Embodiment 5 Next, a fifth embodiment of the present invention will be described with reference to FIGS.

In this embodiment, a filter 103 having a permeability of 4 sec according to the test method of JISP8117 is fixed to the cap 102 fitted to the toner filling port from the inside of the cap 102 by ultrasonic welding or heat welding. When the cap 102 is attached as a protective member of the filter 103, the cap 102 is provided with a through hole 105 as a depressurizing portion. In order to maintain the strength of the cap 102, a through hole 105 is provided in the through hole 105 as shown in FIG. A rib 102d is provided, or a radial rib 102e is provided as shown in FIG.

Embodiment 6 Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.

In this embodiment, a filter 103 having a permeability of 4 sec according to the test method of JISP8117 is fixed to the cap 102 fitted to the toner filling port from the inside of the cap by ultrasonic welding or heat welding. Is a protective member of the filter 103, a rib 102b is arranged around the filter 103,
The filter is configured to prevent the filter from peeling off due to the movement of the toner at the time of rotary rotation or the like.

Seventh Embodiment As a seventh embodiment, the developing cartridge including the developing devices of the first to sixth embodiments is detachably mounted on the image forming apparatus. In this case, the same effect as above can be obtained.

Embodiment 8 As an eighth embodiment, there is provided an image forming apparatus including the developing devices of the first to sixth embodiments. In this case, the same effect as above can be obtained.

[0072]

As is apparent from the above description, according to the developing device, the developing cartridge and the image forming apparatus of the present invention, the lid member fitted to the filling port of the developing container has one or more holes. Since a filter member having an air permeability of 5 sec or less is attached to the hole, the filter member is less likely to be clogged, and the filter member can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram illustrating an image forming apparatus using a developing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a developing device according to a first embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a toner container, a filter, and a cap according to the first embodiment of the present invention.

FIG. 4 is a side view showing a developing device mounted on the developing rotary of the first embodiment according to the present invention.

FIG. 5 is an exploded view showing a filter and a cap according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a developing device for explaining a third embodiment according to the present invention.

FIG. 7 is a sectional view showing a filter and a cap according to a fourth embodiment of the present invention.

FIG. 8 is a front view showing a cap according to a fifth embodiment of the present invention.

FIG. 9 is a front view showing a modification of the fifth embodiment.

[Explanation of symbols]

 21 Photosensitive Drum (Image Carrier) 29Y, 29M, 29C Developing Device 100 Toner Container (Developing Container) 100a Wall 101 Filling Port 102 Cap (Lid) 102a, 105 Hole 102b, d, e Rib 103 Filter (Filtering Member)

Claims (18)

[Claims] 1. A developing device comprising: a developing container for storing a developer; a filling port for filling the developing container with the developer; and a lid member fitted to the filling port. It has at least one hole and the air permeability is 5 s
ec. A developing device provided with a filter member of ec or less. 2. An electrophotographic image forming apparatus, comprising: a developing container for storing a developer; a filling port for filling the developing container with the developer; and a lid member fitted to the filling port. In the developing device mounted on the selection mechanism, the filling port is provided on a wall surface of the development container perpendicular to a rotation axis of the rotation selection mechanism, the lid member has one or more holes, A developing device, wherein a filtration member having an air permeability of 5 seconds or less is attached to the hole. 3. The developing device according to claim 1, wherein the filling port is arranged at a position where the lid member is not buried by a developer during development. 4. The filter member is fixed by ultrasonic welding or heat welding from the inside of the lid member, and the filter member and the lid member have an outer surface excluding a welded portion and its periphery. 4. The developing device according to claim 1, wherein the developing device has a step so as not to contact the lid member. 5. The developing device according to claim 1, wherein said lid member has a through hole and radial or lattice-shaped ribs. 6. The developing device according to claim 1, wherein said lid member is provided with a rib around said filter member to prevent said filter member from peeling off. 7. A developing cartridge having at least a developing device and detachably attached to an image forming apparatus main body, wherein the developing device includes a developing container for storing a developer, and the developing container is filled with the developer. And a cover member fitted to the filling port, wherein the cover member has one or more holes, and a filtration member having an air permeability of 5 sec or less is attached to the holes. A developing cartridge comprising: 8. A developing cartridge having at least a developing device and detachably mounted on an image forming apparatus main body, wherein the developing device includes a developing container for storing a developer, and the developing container is filled with the developer. And a lid member fitted into the filling port, the filling port is provided on a wall surface of the developing container in a direction perpendicular to a rotation axis of the rotation selection mechanism, and the lid member Is a developing cartridge having one or more holes, and a filtration member having an air permeability of 5 sec or less is attached to the holes. 9. The developing cartridge according to claim 7, wherein the filling port is arranged at a position where the lid member is not buried by a developer during development. 10. The filter member is fixed by ultrasonic welding or heat welding from the inside of the lid member, and the filter member and the lid member have an outer surface except for a welded portion and its periphery. The developing cartridge according to claim 7, wherein the developing cartridge has a step so as not to contact the lid member. 11. The developing cartridge according to claim 7, wherein said lid member has a through-hole and a radial or lattice-shaped rib. 12. The developing cartridge according to claim 7, wherein said lid member is provided with a rib around said filter member to prevent said filter member from peeling off. 13. An image forming apparatus having a developing device having a developing container for storing a developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port. The filling port is provided on a wall surface of the developing container in a direction perpendicular to a rotation axis of the rotation selecting mechanism, and the lid member has one or more holes, and the holes have an air permeability of 5 sec or less. An image forming apparatus to which a filtering member is attached. 14. A rotary selection mechanism is provided with a developing device having a developing container for storing a developer, a filling port for filling the developing container with the developer, and a lid member fitted to the filling port. In the image forming apparatus, the filling port is provided on a wall surface orthogonal to a longitudinal direction of the developing container, the lid member has one or more holes, and a filtering member having an air permeability of 5 sec or less is attached to the holes. An image forming apparatus comprising: 15. The image forming apparatus according to claim 13, wherein the filling port is arranged at a position where the lid member is not buried by a developer during development. 16. The filter member is fixed by ultrasonic welding or heat welding from the inside of the cover member, and the filter member and the cover member have outer surfaces of the filter member except for a welded portion and its periphery. 16. The image forming apparatus according to claim 13, wherein the image forming apparatus has a step so as not to contact the lid member. 17. The image forming apparatus according to claim 13, wherein said lid member has a through hole and radial or lattice-shaped ribs. 18. The image forming apparatus according to claim 13, wherein said cover member is provided with a rib around said filter member to prevent said filter member from peeling off.