JPS5986068A - Developing device - Google Patents

Abstract

PURPOSE:To attain contactless, excellent development which handles colors by allowing a single-component developing device to utilizes electric field force by a supply roller, developing roller, wires, etc., which are impressed with voltages. CONSTITUTION:The developing roller 2, supply roller 5 made of porous sponge material, and plural wires 7 provided between the roller 2 and a photosensitive drum 1 are impressed with specific AC voltages and DC voltages from power sources 9-11. Then, a thin layer of single-component toner electrostatically charged by friction is transferred from the roller 5 to the roller 2 by electric field force. This uniform thin layer is scattered similarly by electric field force to form a cloud of toner around the wires 4 and attracted by the electromagnetic latent image potential of the drum 1 to develop the latent image on the drum 1. Therefore, no magnetic force is used for the toner movement, and consequently excellent development which handles colors is performed without contacting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a developing device, and particularly to a developing device using a non-magnetic component developer.

[Obvious technical background and problems]

KamekoThe magnetic brush development method is known as a representative method for developing images in the photographic process, but recently,
One-component development methods using id-based toners have come into widespread use. Compared to the magnetic brush refinishing method, which is a two-component development method, this development method has the advantage of no deterioration of developer life and is maintenance-free. Since this is done with 11 energy, it is necessary to use magnetic 11 toner, and therefore it is impossible to color the toner. Therefore, now dl 1. 'Pc
, fax machines, laser printers, and more! lII
To deal with the colorization trend in! l1ltshii.

[Object of the Invention] An object of the present invention is to provide a non-contact developing device that overcomes the deficiencies of the conventional parent stock method described above, is capable of dealing with colorization, and is non-contact.

[Inventor, 'f]

The present invention can cope with colorization by using non-magnetic toner instead of the magnetic toner used in conventional development methods, and - component development method does not deteriorate the life of the developer due to residue. It has the advantage of being maintenance free.

Since there is no contact between the photosensitive drum and the toner layer during development, the phenomenon of peeling off during multiple development is eliminated, and stable color image quality can be obtained.

Figure j, Q, is Akira Kiuchi's 'i#<completion diagram. Opposing the If & optical drum (1), a ]JH symmetrical roller (2) is arranged.

Furthermore, a wire (4) is present between the photosensitive drum (1) and the developing roller (2). The above developing roller (2)
The supply roller (5) and cleaning roller (
3) are arranged, and each supplies a uniform thin layer of toner and cleans a layer of waste toner for the next time.

The supply roller (5) is a sponge roller having porous holes (n), and as this rotates within the toner dropper (121), an appropriate amount of toner charged by frictional electrification is conveyed by the porous roller.The toner is a non-magnetic toner. Therefore, this porosity plays a useful role in conveying force.Furthermore, a desired thin layer of toner is formed by the regulating roller (6).

At this time, the regulating roller (6) and the sponge roller y (51
(!: t7) Contact with a sponge roller (
Since 0) is A], 1. Partial assimilation of one more layer,
In other words, the blocking problem (d) does not occur, and an extremely good j=no auxiliary station is possible.

In this way, a uniform thin layer of toner with sufficient VC and electrical roughness comes into contact with the developing roller (2), and the electric field between the droplet roller (2) and the sponge roller ('5) As a result, only one layer of the desired thickness is transferred to the developing roller (2) and subjected to development.

10,000, residual toner layer t, collection roller (recovery is performed by force, sponge roller surface 1σ returns to initial state. Uniform thin layer t formed on developing roller (2), 1:, photosensitive drum wire (4)
) and the developing roller (2), the developing roller (2) starts flying toward the sensitive C drum (11), and development is performed.

An alternating current voltage (9) and +lO1 are applied to the developing roller (2) and the wire (4), respectively. As a result, a toner cloud state is formed near the wire +4) independently of the row image '1' position. Next, this toner cloud is 1 m long.
ia: The parent stock should be carried out. In this way, by arranging the wire (4) between the developing roller (2) and the photosensitive drum (1), non-contact development can be performed even if the gap between the developing roller 2 and the photosensitive drum 1 is relatively large (~ 1・n
m) become possible.

The configuration of the developing roller) 11j is shown in FIG. Cleaning of the insulating film 122 on the A/roller (21), which has been given a surface finish, is carried out by a cleaning roller (3) consisting of a single-purpose gono roller.

Since the cleaning roller (3) is grounded, the 1'lL load on the insulating film (malt) disappears to the ground.In this way, the surface of the insulating film (22) can always maintain its initial state. It is possible and can withstand repeated use.

As mentioned above, toner images developed in a non-contact state are
A conventional electrophotographic process is used to transfer the image to paper, while the photosensitive drum enters a cleaning station for repeated use.

[The moving bed of investigation]

In the developing device of the present invention, the photosensitive drum (11) and the toner are in a non-4D contact state, and the wire (4) corresponding to the grid is placed between the photosensitive drum (11) and the developing roller (2) so that the wire (4) is not in contact with the toner. As a result, the design and production of equipment has become much easier as Giang's ``RN use for foreign cars has become widespread.''

It's a development method that does not disturb the image of the development method, so in the color process "C1" is constantly stable.
i can hold negative.

By supplying toner to the current 1 dust roller (2) to the sponge roller 5), the friction couple 1'
An appropriate amount of toner applied once is conveyed through the porous material. Furthermore, due to the elastic force of the sponge roller (5), toner blocks did not occur, and the toner was extremely evenly distributed.

By applying an insulating coating to the wire, toner adhering to the wire can be removed from the wire! ('4. Charging due to charge injection) and changes in band dL polarity were prevented, and stable image quality without capri was obtained.

[Embodiment of the Invention] The developing roller (2) is an Al roller (32φ) made of 20IIm thick Mylar linked together, and facing this, a Se photosensitive drum (130φ
), the developing roller (2) and the Se photosensitive drum (1λ
Wide (4) (1 (10) + rnφ, several μm
1. Apply a thick Teflon coat). 20 tension in mm intervals. The distance nt between the wire (4) and the developing roller (2) is 4
00/7m.

The toner is supplied to the developing roller (2) by using a sponge roller (20φ) as the toner supplying member (5).
800sinwtl-750(V)Co)=27rf,
A pressure of f=IRJ(z) (old) at 11°C is applied. The toner in the toner hopper (13) is charged to a positive polarity by the band "ll" (means "Faplash (8)"), is conveyed by the holes of the sponge roller (5), and is conveyed to the rubber roller (10φ).
The layer thickness is regulated by (6).

The single layer of toner whose thickness is regulated is conveyed to a position where it contacts the developing roller (2), and the toner adheres to the developing roller (2) due to the electric field between the developing roller (2) and the sponge roller (5). The developing roller (2) has V, == l 3 Q
Qsir+r+Jj+550(V)i9) is applied. The toner that could not be attached to the developing roller (2) due to the above electric raising is removed from the rubber roller (7) which is the collection row 2 (7).
10φ) and returned to the toner hopper Oa.

On the other hand, when the toner adhering to the developing roller (2) enters the developing area, it starts flying due to the electric field between the wire (4) and the developing roller (2), and forms a toner cloud near the wire (4). Wire (4) has V2 = 8Q Q s
inωL+: 350 (Vχ10) is applied,
This toner cloud is attracted to the image area where the latent image potential is +150V, and development is performed. Latent image in non-image area '11
It was +600 V at position C. On the other hand, the developing roller (2
) The toner remaining on /c is scraped off by a grounded cleaning roller + 3) (10φ 'j'l'a rubber roller), and the potential on the surface of the developing roller (2) is set to zero, and the next process is carried out. Prepare for.

As described above, in the developing device of the present invention, the photosensitive drum and the toner are developed without contacting each other, and a uniform toner layer is created using the sponge roller, making it possible to constantly produce stable and clear images. Ta.

The embodiment of this invention has been described above, and the features of this embodiment are as follows.

(i) A charging means for charging the toner and a means for applying it to the developing roller are separately provided.

■A non-aFi H-)ner is used.

(2) The supply loan may be provided in contact with the developing roller or may be provided in a non-contact manner. However, in the latter case, it is necessary to apply an electric field between the supply roller and the developing roller.
Ruru.

(2) Feed roller 6.12: From the point of view of assembly, it is desirable that it be porous.

(2) Furthermore, if the supply roller has elasticity, it will be resistant to vibration, and the contact area with the developing roller will be large, resulting in stable toner application.

[Actual example of invention]

Next, an embodiment regarding toner flight will be described with reference to the drawings.

As shown in FIG. .

The roller (,31) is made of aluminum, for example, and has a diameter of 321,1111. The peripheral surface is coated with an insulating material, such as Teflon.

This developing roller ( ) 1) is supplied with a first power supply +371 to +17 and a river v1 11Gj. This Eki 1'
Yama: (kata (one phrase is the first y style market) (this output is V
ll. ) and the first 11-1 stream 'tun source (41) (
Let this output be Vl2. ) and force/ra.

V + P, i Vl = Vl l + Vl2 Next, a part of the wire (the wire is made of tungsten with a diameter of 1 (10/l m) and is electrically connected to four -C.
．． In other words, in FIG. 1, a 1,1" side view of a portion of the wire is shown, and tungsten wires are arranged at intervals of 1 rruπ, facing the circumferential surface of the developing roller (31). 2
0 tension [tired]

A voltage V2 is supplied from this wire part +1 (the second power supply +33 to ij). This 8I! 2 of 1 is the source (the rising is the second AC' power supply (this output is V21) (
3 and a second IM flow source (its output is V22. '
Fit/group image is maintained. That is, a charge distribution pattern is formed. In this example, the image was changed and the image quality and fog were measured.

Here, the image density is determined by irradiating light and measuring the reflected light. However, when evaluating, the incident light intensity is divided by the reflected light intensity, and the logarithm is calculated. The numerical value at this time is preferably 1.0 or more.

Fog, as is well known, is an area where toner has adhered even though it is a non-image area. This gap can also be evaluated by dividing the incident light intensity by the reflected light intensity and taking the logarithm. The value at this time is about 0.4, and if it is 1 fish, the image will be very rough and almost black.

When the development is evaluated using these two amounts, the measurement results are as shown in FIG.

As can be seen from FIG. 4, the image resolution pattern was measured with full image resolution. In other words, the electrostatic latent image is
．． Five lines were formed at a density of 2 lines/mu and 4 lines/mm, developed using the above-mentioned apparatus configuration, and the image on the recording paper was measured using Microdenzi Maker.

To summarize the results, of the five lines, the outer two
It is characterized by a low rate of fake books.

Therefore, in order to evaluate the fidelity of development, the average ff! of the central three lines among the five lines was determined. The ratio of LlfIh to the average ilJ degree D2 of the two end lines, ie, D2/DI, is defined as development fidelity 91D. The closer this D is to 1, the higher the fidelity.

FIG. 5 shows experimental results using such amounts. As can be seen from this figure, when the alternating current period T is 600 μm or more, the fidelity of development is a satisfactory value.

Here, it should be noted that the AC period T of the in-pressure is the period of the alternating electric field applied to the toner.

Next, in order to evaluate the experimental results, the inventors conducted a simulation regarding the flying speed of the toner. The equation of motion of the toner at this time is as follows. However, the particle size of the toner is 2r, the mass is m, the charge is q1, and the viscosity coefficient of nitrogen is η,
The electric field acting on the toner (the "IT field" in the direction from the developing roller C, 4++ to the photoreceptor C3) is assumed to be the total EX.

Here, since it is very difficult to analytically obtain % J'2X, the flying motion of the toner is determined by a mathematical analysis.

In order to find the position distribution of ``1'', we will use the image loan (31), the photoreceptor (35) and the wire part i, (:1
Add /iW4 to the boundary value at 1 to find the negative distribution of the point 'Nemmoe and the dipole.

Next, the potential based on the parallel [fi field] between the developing row 2 and the photoreceptor was combined to determine the potential of f to 1 year. The result is as follows. Here, U(x
, y) is the 1(L position distribution) at locus (x, y), and 1
．． )
child.

The results are shown in FIGS. 6 and 7. In Figure 6, the period of the voltage, that is, the period of the alternating current electric field, is plotted on the horizontal axis, and the photoreceptor (
3! The figure shows the toner arrival time Ta and the toner velocity Va at the time of arrival to the photoreceptor (15).

As can be seen from this result, when the AC cycle is approximately 700μ, the velocity of the toner reaches its minimum value.

From 2, the toner accelerates and decelerates in an alternating current electric field by %Y!
The toner reaches the photoconductor repeatedly, but it reaches the photoconductor at a speed of almost zero (this is concluded to be flat landing. In other words, the toner reliably senses the charge pattern on the photoconductor ((i)). If possible, the image will be faithfully captured and the image quality will be high.

4 Simplified explanation of the drawings Figure 1 (Better, shows one embodiment of the supply roller (11-member structure 1)
/1, Figure 2 is a configuration diagram of the developing roller, Figure MJ is a configuration diagram for explaining an example regarding toner flying, and Figures 4 and 5 are shown in Figure 3. Device 1 (
The experimental results are shown in Figure 3(e), Figure 3(e), Figure 1(a) showing the frequency of the electric field (indicated by a black circle) and fog (indicated by a black circle), and Figure 5(a). teeth,
Figures 6 and 7 show the self-made fidelity, and Figure 6 shows the results of the 7 Miles. b?, which shows the time for toner to reach the photoconductor (indicated by a white circle) and the speed at -6 o'clock (indicated by a black circle) with respect to the number of strips. l, M'
Diagram r7 is a diagram showing the position (indicated by a white circle) supporting the minimum value of the toner speed and the minimum value (indicated by a black circle).

(1)...Photosensitive drum, (2)...Developing roller, (
3)...Cleaning roller, (4)...Wire, (
5)... Supply roller, (6)... Regulation roller, (7
)...opening roller, 18)...5 charging means, (9),
(10), CI])...iji 11ha (1
2)...Toner hopper! 21) ... Gold roller, ', 23 ... Insulating coating material, (11 people from f) Figure 3 Figure 4 = To (, uAQ Figure 5 → - Figure 6

Claims (3)

[Claims] (1) A means for collecting toner from the toner supply material, and a means for collecting toner from the toner supply material, which includes a supply member disposing a toner carrier and supplying toner to the toner carrier, facing the electrostatic image holding member, and an amount of toner. and a means for charging the toner, and a plurality of wires are provided between the static aS image holding member and the toner carrier, and an alternating current and a direct current r( A developing device characterized in that an abrasive static latent image holding member is imaged by applying an L pressure. (2) The developing device according to claim 1, wherein the toner supply member is a sponge roller. (3) The developing device according to claim 1, wherein the wire is coated with insulation.