JPS5931977A - Dry type developing device - Google Patents

Abstract

PURPOSE:To charge electrostatically high-resistance toner to a high level and to obtain a visible image of stable high quality, by providing a magnetic field producing means of establishing at least an AC magnetic field between the AC and DC magnetic fields at an opening. CONSTITUTION:A photoreceptor 1 positioned facing the opening 9 of a container 4 is driven to rotate, for example, counterclockwise and a latent image forming device forms an electrostatic latent image of the surface of the photoreceptor. As the photoreceptor 1 rotates, toner charged to specific polarity, e.g. opposite to the polarity of charges of the latent image separates from magnetic material powder and moves to the latent image where the latent image faces the opening 9, making the latent image visible. This visible image itself is transferred to transferring paper. Then, toner as much as the toner moving to the photoreceptor 1 is supplied from the container 4 to surfaces of particles 18 successively and charged by the vibration of the particles 18. In this case, the toner is stuck to each magnetic substance particle 18 preferably in a very thin layer to improve the picture quality of the visible image formed of the toner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry developing device (f) that produces an R+P visualization using all toner of an electrostatic latent image formed on a latent image carrier.

Double-format 1-viewing device v1 that can be used in electronic copying machines, electrostatic recording devices, photo/photo recording devices, etc.
．． is well known from the past. This type of developing device uses a toner consisting of toner particles and a component other than a carrier that is mixed as necessary in the coil 1, that is, a one-component developer. It has the advantage of simplifying the configuration compared to the developing device (compared to the conventional one).By the way, the component system I and the developing device V using the developer (volume solidity) have a resistivity of HIIOΩ. When using a high resistance toner of 11-1 or more, especially 10I3 to 14 Ω-cm or more, it is necessary to force the toner to have a predetermined polarity in the π band before using it for the toner outlet. It is desirable to maximize the amount of charge on the toner and improve the quality of the visible image.For this reason, conventionally, when charging the toner, T1 is made thinner, with a total layer thickness of 1 cm1. i- is uniform (f(, when charged, r14-
;i:Electricity-14・Raising Yotsukoshi 1:Developing device-
7) ・Various proposals'8-'Sai1 and 2) have been modified from conventional construction techniques (1) whose structure has become more complex] or large (-
However, it did have some drawbacks.

\Invention 1] The purpose of the invention is to eliminate the conventional drawbacks described in 1-1 and to create a new 1.1.1.4. Ci', i'zp expression expression 11' device is provided below.
11 applied to the developing device 6 in the child copying machine, the body side will be explained.

Figure 2B1 shows the structure of the photoconductor 1 in the shape of a 1. A developing device 2 is located at a position 11'I along the line 3', facing the support member.

The developing device 2 includes a toner container 4 ff1i' L- containing toner (-/component developer) 3, and this container 4 is a second container.
The figure (fj clearly shows - J-ru-like) is arranged in the shape of an inverted character, and there are also two side wall plates 5.6 and two non-magnetic plates (I) made of magnetic material on both sides. A slit-shaped outlet opening 9 is formed in the toner container portion facing the photoreceptor 1 at 47.

Each side wall plate 5, 6r has a coil + (+, I 1 1 turn ζ, +9, each coil + (+ , , +
1-+1 AC power supply 12゜1.3ff (:' and stone 1'
-6 continuations are old. The side wall plates 5, 6 are made of a magnetic material, particularly a ferromagnetic material with a value of 30 to 50 oersted, such as high tensile JJ steel. By electromagnet 14.1
5 is outdated by 1 configuration. The toner 3 may be made of a magnetic material or may be made of a non-magnetic material.

On the other hand, at the upper end of each side wall plate 5, 6 is a t1 permanent magnet 16°1.
7 is 7i1. ] Fixed ζ No. 17, each permanent IP 1. The magnetic poles facing the upper ends of the side wall plates 5 and 6 in the stone 16 and 17 are of opposite polarity. Both permanent magnets 1
It is also possible to omit one of 6°17.

In the opening 9, charging means 1 for performing h-3--f frictional charging in a manner described later is arranged 9. In this example, a plurality of magnetic particles 18 are used as this means 9. ing. Particles 18 consist of 44-1 particles capable of triboelectrically charging the toner to a predetermined polarity. Now, switch of power supply 17.13 (not shown) is connected to "Fujiia", therefore coil 10. I] U (The current is in a flow layer! Mouth,..., then there is an open D 9 (1 recursive particle -180 and (t1 permanent 6R stone 1 fi, 17 grinding force /
Don:/+<acts, - magnetic binding force (rC causes magnetic body r18 to open 1") 9 V (remains stationary, held in open position, open 1-4 f, closed) to prevent the toner in the container 4 from flowing outside the container.In this case, each I11+1 wall plate 5°6 -[2*11
．． ; each magnet has 16 and 1.7 magnetic poles.
Because of the extremely opposite polarity, a repulsive magnetic field is generated in the aperture 9 (1).

1+) Photographing operation starts 1, AC power supply + 2. , 13
When the switch is turned on, the magnetic particles existing in the area of the aperture 9! 8&ko (・AC 1H1i field due to J1 electromagnet 14.15V, combined 41 cup field with DC magnetic field due to permanent magnet 17.18) acts 1. Therefore, the magnetic particles that were at rest at the age of 21 18 is the action of AC 6H field V(
The particles 18 begin to vibrate more, and due to the contact U between the particles 18 and the toner, the toner is electrostatically attached to the triboelectrically charged lie 11 with a predetermined polarity, and the toner is electrostatically attached to the particles 18vc.

On the other hand, the L body 1 faces the opening 9 of the container 4, and the L body 1 moves, for example, in the counter-chronological direction π rotation 1 tt'i 1
．． , at this time, by a latent image forming device (not shown),
One electrostatic layer is not formed on the surface of the photoreceptor. Photosensitivity (A-1
As the latent image rotates, the latent image reaches the position U'' facing the aperture 9, and as described above, the predetermined polarity, for example, the polarity r opposite to the charge of the latent image.
The charged toner 7 is separated from the magnetic particles 18 by electrostatic force and transferred to a latent image 1, and the latent image becomes a visible image. This visible image (illustrated as well known at the base 2)
Transfer the awn onto unused transfer paper. - The amount of toner transferred to the RF two-sensor body iF is sequentially supplied from the container 4 to the entrance surface of the particles 18σ) and is charged by the vibration of the particles 18.

The developing operation is carried out in two series, but in order to reduce the quality of the visible image formed by the toner, the toner is applied to each magnetic particle 18 in an extremely thin layer. It is desirable to If the layer thickness of the toner is thick, it is difficult to charge the toner uniformly over the entire layer, and it may be difficult to suppress the charge amount of the toner. In this case, when a large amount of toner (σ) in the container 4 is supplied to the opening 9 (ζ), the magnetic particles 18
If a large amount of toner is fed during the circumference of the particle 18, the layer thickness of the toner becomes thicker, the friction between the particles 18 and the toner becomes insufficient and the amount of charge is small (the toner When this occurs, the inconvenient hill/pupil of f-1 (which may cause a total deterioration of the image quality of the visible image) is caused by f-1 on the latent image. , the 41 immature binding force acting on the magnetic particles IFIζ is made stronger than the same binding force acting on the toner existing in V
It is possible to rub (11). Like this - 7i 7.
is open 111. +9 &ζI1'4The difference in the ratio Φ of Il/c-r, -1 between the toner to be placed and the particle 18 is large (the nuclear particle 8 is included), I-18. Toner other than toner can be kept in the container by the electrostatic distribution thread, and the toner in the container 4 is supplied to the particles 18 in an amount that is eliminated. This 31 is conventionally adopted in the magnetic beneficiation method, etc.
The idea is similar to that of lc.

Various methods can be used as appropriate to cause the difference in the magnetic binding force acting on the toner and particles 18 in the opening 9 as described above. For example, when the toner has magnetism,
The particles 18 may be made of a more expensive magnetic material than the toner, or the diameter of the magnetic particles 18 may be made larger than that of the toner particles. 8), the amount of magnetic material in the toner may be greater than the amount of -C in the toner, or both may be used in combination.When the toner is made of a non-magnetic material, Since no magnetic force originally acts on the toner, the above-mentioned large magnetic east binding force υ can be caused to exist without special considerations.

Also, the lower end of one of the side wall plates 5 and 6 of the toner container 4 (l'1lli portion where the opening 9 is located)
[If the generated magnetic field and the magnetic field generated at the lower end of the other side wall plate 6 have the same polarity, a repulsive magnetic field is generated at the opening 9, and the magnetic field is generated from the container 4 through the opening 9. 1. There is a risk that a large amount of toner may fall at once. Since there is
For example, assuming that the magnetic field at the lower end of one side wall plate r) is set as shown in Figure 3 (al), the magnetic field at the lower end of the other side wall plate 6 is set as shown in Figure 3 (I). The polarity at both F ends is the same at the same time.
It is advantageous to configure. O f two coils + (1,
The alternating current magnetic field K generated by 11 (1 and 1.':
) If the particles 18 are made to have the same phase, the vibration amplitude of the particles 18 will become very large, causing the toner in the container to open [0].
Since there is a possibility that the page may be lost through the thread, please refer to Figure 2B3 f;
As shown in (b), it is desirable that the two alternating magnetic fields have a phase difference t, so that a constant matrix of constant Vζr9 acts on the particles 18 in a continuous manner. The value of the current flowing through the coils 10 and 11V ('i, the shape of the side wall plates 5 and 6, the permanent grinding stone 16
, 17 of 4゛ (can be set appropriately depending on the quality, shape, etc. Vζ, but the current must not be so high that it will permanently demagnetize the coil 1 (1,
The current 6i to be passed through the coil V
, & This corresponds to the magnetic field produced, but the effect is similar to that described above! ;, '71 result is obtained. In this case, the current source is a well-known white noise generator or
An amplified signal such as a -1 pseudorandom pulse 7-engenerator can be generated.

Incidentally, if the magnetic particles 18 used are a conductor (jk or a conductor coated with an insulator), then these particles 18 will have the same function as a gear in a two-component developer.
Advantageously, it serves as a counter electrode for the latent f-image. Get 1 coil 1. (Both fils with 1, 11, i winding
It is desirable that the wall plates 5+6'T be made of a conductor, and that the side wall plates 5 and 6' serve as counter electrodes for the latent image. It is also advantageous to improve the quality of the visible image by applying a . Such a configuration consists of a conventionally well-known developing sleeve made of a conductor, and the former 91. This is based on the same idea as applying the bias voltage IIE'Q4 as necessary.

In an experiment conducted using the apparatus shown in Figure 1, particles 1
8, particle size of 1() μm to 1.00 m? The frequency f of AC from AC power supply 1:/, +3 using conductor particles with 1. (1 (TI-1z or higher, special (F 4 (
When set to 101 (z or higher), a visible image with less unevenness can be obtained.

4. Illustrated in Figure 1 (↑).

f, H/1. + bone body trl child 180 instead of 1 each side wall plate 5
,6 lower ζ+ii5 Vr tlfj f=31 ta fiber 1fHJj)? i+l-j ”y shiI 8 ;+
, 18h and the support part! A single charging stage consisting of an RII+ shaped magnetic brush 18 (with one end supported by the RII+-shaped magnetic brush 18) inserted into the opening 9 with one end supported is used.

This embodiment is substantially the same as the embodiment described above. Brush 18a.

18h and 18c are arranged continuously in the longitudinal direction Li of the body l and are oriented from T. In this embodiment, the alternating magnetic field acting on the opening 9 causes the brush 18a to
.

I 8 l'), l 8 c vibrates (-1) and charges the toner to a predetermined frame rate by contact between the plan and the toner;
Apply the toner to a brush in a thin layer and electrostatically adhere to it.
Therefore, using this toner, it is possible to form a high-quality developable product.
(Switches 1 and 11 are switched 1) as shown in Figure 1.
As in the case of this embodiment, permanent magnet] 6, 17J''
Since an IK current magnetic field is generated in the opening 9, the brush 18
a, 18h, +8clf, magnetic flux Pj due to coil 1
1 slope, the brush closes the aperture 9, and thus the aperture 9
It is possible to prevent Teto 3-1 from falling by 11 degrees. Also, the support team was kidnapped? 0 and this support ζi]
By omitting the additional brush 18c51, it is possible to obtain almost the same effect as the 1741'' effect.

In the embodiment shown in FIG. 5, the support layer 11 phase 20 supporting the magnetic brush 18c located in the container 4 is made of a ferromagnetic material, and the third coil 21 is wound around the coil 1. The coil 21 is connected to a third AC power source 22, and a third electromagnet is connected by the support part 420 and the coil 21. 3
is composed of 1. ing. Further, a third permanent grinding stone 24 is provided at one end of the support part 20. In this case, in this example, there are three permanent (1 koishi + 6°24.1.7),
The magnetic poles facing the side wall plates 5, 6 and the supporting part phase 20 alternately have 14 polarities. Therefore, as in the previously described embodiment, a repulsive magnetic field is formed in the aperture 9, and it is completely prevented from occurring in areas where there are no lines of magnetic force.
Even when 3゜22 is off, brushes I 8 a, T 8
A magnetic binding force due to a DC magnetic field always acts on b, l 8c, and the brush completely closes the opening 9, so the three electromagnets 14 prevent the toner from falling through the opening 9. , 23.15 coil i (1, 2+,
, 11f The phase difference between the flowing currents (example: λ is 120°)
Mo f: Se, Koia et al. Brush I 83.181),
1.8 c and (/r constitute a kind of motor, plan I 8 a + 181), I
Let Rc be the hair movement; the contact efficiency between the brush and toner;
Therefore, the charging effect of toner ~t,', is higher, that band? i?
, brush 18a toner with an electric charge.

181), I 8 t: It is advantageous to impregnate the latent image with 1q and visualize the latent image with 1q. Figures 4 and 5
In the figure, small brushes 18a, 1.81)', 18c are also used as one particle 18 (Fig. 1), a conductor, or
Insulators coated with f: can be advantageously used.

As mentioned above 1. In each of the embodiments, the entire electromagnet is constructed using the side wall plate of the toner container itself, and as shown in FIG. It goes without saying that an electromagnet may be constructed by winding a coil 10° and 11 around the coil 1 to form an electromagnet of 4 or 1.5 i. In this case, vr is considered to be the gap between the two ferromagnetic materials 5a and 6a, and the opening 9 of the toner container, and it is sufficient to place the charged portion such as magnetic particles or a magnetic brush therein. Each ferromagnetic material 5;T.

Permanent magnet 16 at the tip of 6a. Adding '+7'i will work.

In the embodiment, particles 18 or brushes 18a.

181), charging means consisting of 18c -> liJ opening 9V in dynamic state? However, when magnetic toner, at least a part of which is made of a magnetic material, is used, the toner itself is charged by an alternating current magnetic field without installing a special charging means. It is also possible to charge the toner to a predetermined polarity by vibrating the opening 9w and hitting the toner container with the coil 1. It is also possible to charge the toner by using only a direct current magnetic field A (or alternatively an alternating current magnetic field) as the magnetic field generated in the aperture. However, if it is designed like this, when the coil switch is turned off, the opening [11! Since there is a risk that the toner in the container (including the particles 18 in the example of FIG. 1) may fall through the opening 9 (2, in the example of FIG. 1), it is necessary to prevent this. (,
An opening/closing cover is provided to open and close the opening location, and when no alternating magnetic field is generated, open 1-1';<- υζ to cover with this cover.
There is a need to.

Brush I 8 a, 181 on world (1, ");moon" 9
), 18 c f may be provided, and 14, it is also possible to configure the toner to be mechanically flocculated by a brush to prevent the toner from opening and falling off. In this way, it becomes possible to omit both the permanent magnet and the cover. Particles 18 (J Furan I 8 :+, ] 81).

18C is composed of at least a portion of the llH isomer.
If it is assembled, it is necessary - Eshi also σ・whole ke (1z + gender body r
) There is no mind to compose.

This invention is! - It can be widely applied to developing devices such as belt- or notebook-shaped developing devices, electronic copying machines t'J, and developing device filters 6 in other recording devices.

As described above, according to the present invention, by providing a high charge ftjL' to a high-resistance toner with a simple configuration, a stable and high-quality 11'' fw can be obtained. Sword f
: It is also possible to completely eliminate the developing sleeve used in conventionally known developing devices. Furthermore, since the toner W present in the opening of the toner container can be given, the toner stone can be stirred with the toner stone.
Therefore, it has become possible to omit the 1 or 2 1" δ stirring device that was conventionally used.

[Brief explanation of drawings]

FIG. 1 is a side view showing a developing device and a developing device according to the present invention; The wall plates are all omitted and shown in Figure 1 and Figure 2.
Figures (1) Perspective view showing the toner container, coil, and permanent magnet (1), Permanent magnet (all shown by chain lines), (1) Figure 3.
Figures t, 3i, +l)j are diagrams showing an example of the magnetic field, Figures 4 and 5 are side views similar to Figure 1 showing other embodiments, and Figure 6 is a diagram showing another example of the toner container and the electromagnet. It is a broken perspective view showing a tfl+ example.

Claims (2)

[Claims] (1) Using a high-resistance toner with a volume resistivity 1' of 10-0, cm or more, the electrostatic charge /P'F4 formed on the T1 latent image 4'o carrier is visualized; In the type developing device, an opening for the toner outlet is formed in the part of the toner container facing the latent image tit 4'! Provided with a magnetic field generating means that generates at least the alternating current magnetic field and the direct current magnetic field.
. (2) The resistivity in the volume is 1010Ω-on, 1
Using the high-resistance tree on the top 1, the old U electrostatic latent image formed on the latent image carrier is visualized using a dry development method. , υγ image carrier (/(opposed 12 parts IF) Fully formed opening for toner exit 1, At least an alternating current magnetic field is applied to the closed opening, and means 4 is used to generate a lukewarm magnetic field. At the same time as the charging means is provided, at least a portion of which contacts the toner and triboelectrically charges the lever 1, the charging means is made up of a magnetic body or 1. The dry developing system (West), which has all the characteristics.