JPS58153972A - Developing device - Google Patents

Abstract

PURPOSE:To form a toner layer having a uniform thickness on a developing roll and charge this toner layer, by pressing a curved controlling member to the developing roll holding a one-component toner and applying a voltage to the controlling member. CONSTITUTION:A conductive rubber roll 20 is provided in the aperture part of a toner hopper 8 and is rotated. A conductive controlling member 16 consisting of elastic materials is curved and is pressed to the surface of the roll 20 to form a layer of a one-component toner 7 having a uniform thickness on the conductive rubber roll 20. A DC voltage 18 obtained by biasing an AC 17 is applied to the controlling member 16 to charge the toner 7. An electrostatic image 2 on a surface 1 of a photosensitive drum is developed by this toner layer. It is proper that the specific resistance of the controlling member 16 is 10<5>-10<14>OMEGAcm, and a conductive rubber or plastic or a resin film with a metal vapor-deposited is desirable as materials of the controlling member 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developing device for visualizing an electrostatic latent image of an electrophotographic device or an electrostatic fIk device, and will be further described.

If so, form a thin layer (uniformly) of a two-component developer on the supporting body that holds the Shizukame on its surface, and form a thin (uniform) layer on the two-component developer to form a thin layer on the supporting body to a predetermined polarity.
l! A one-component fa that is charged and sent to create a developed image.
Regarding bias.

[Prior art and its problems]

Conventionally, a regulating member was used on the -component system II retarder tiI image carrier to make it thin and uniform, and a predetermined oii*KIII
Electrostatic f is generated by electrostatic injection or heavy electric current
There is a one-component type LL image device in which a developed image is formed by feeding the image onto the surface of a holder, for example, a photoreceptor.

For example, 41M@! ! 4-51842, 411 Sekisho 84
-1113g! 8゜轡-Sho 54-158937 and JP-A-55-46788.

In such -component system The tip requires a thin insulating material, the thickness of the tip is 05-1.5, and fine processing is required, and a carrier with a special resistivity, etc. required, the structure was complex and expensive. # The layer thickness of the developer is extremely thin, less than 1 μm (a uniform state could not be obtained, and a fog-free tA image with good 4fA properties could not be obtained). Considering the point, it's a selfish thing m*t+
There is no restriction on the mechanical strength of the member, and the structure allows a predetermined charge to be applied using a 111m0A control member, while also forming a thin and uniform developer layer on the developer carrier. It is an object of the present invention to provide an image forming apparatus capable of obtaining a 1lii image with a small amount of dust, low cost, and excellent reproducibility without fogging.

[Summary of the invention]

That is, in the present invention, a regulating member is pressed against a developer carrier, brought into contact with the developer in a curved state, and a voltage is applied to the regulating member to induce, inject, or discharge the developer into a predetermined polarity. It has been found that when a developer layer is formed while being charged, a thin and uniform layer of the charged developer can be obtained, and a fog-free 1ikfA type 11i4II can be obtained. Furthermore, it has been found that a more uniform layer can be obtained when the angle between the tip of the regulating member and the developer carrier is 6 G' or more with respect to the normal.

The reason for this is that because the developer is charged while the regulating member is in pressure contact with the developer carrier and is curved, the contact area is wider (therefore, the charging time is This is thought to be due to the fact that the iA developer can be sufficiently charged, and the developer layer is pushed against the carrier with an appropriate force so that the thickness of the developer layer is made uniform.

In addition, we have also discovered that the above effects are even more apparent when a conductive elastic body is used as the regulating member, and that it is possible to make the lump aging agent layer uniform and extremely thin without mechanically agglomerating it. More conductive? Wind composed of elastic bodies11111HtO
If the specific resistance range is 10'~l□i@Ω1, it can be efficiently @
Charge the image agent, and make sure that there is no aggregation of the material I4 due to discharge destruction, and apply it to the regulating member! It has been found that when the voltage is set to 1 odd voltage, which is a combination of alternating current and direct current, (9) a narrower O developer layer can be obtained and a clearer image can be obtained.

[Example of Akimei]

In the following, the present invention will be explained in detail using examples.

1m1- is the original image - the original image showing the example - and the rough structure is shown.

1 is a holder for holding an electrostatic # image, and has a surface mK feeding edge layer or a wafer photoreceptor layer.

- As an example, a photoreceptor drum is used that has a length of 78φ and a thickness of two aluminum-covered drums (one selenium-tellurium (8@-Te) M alloy photoreceptor is attached to the 08 image. This holder A positively charged electrostatic snow image 2 is formed on the surface 1011. In this example, the electrostatic snow image 2 is a holder lt)
It is formed by uniformly charging the surface with a well-known corona charger, so-called roller charger, etc., and then performing imagewise exposure.

Furthermore, in addition to this, a pattern depending on the image to be formed may be formed using a cathode ray tube or a laser beam, or a dot pattern of electrostatic charge may be formed using a needle electrode, a sales diode, or the like. - The above-mentioned holder 1 is rotated in the direction of the arrow shown in the drawing at a rotational speed of 11Gm/sec, and the II image potential of the electrostatic snow image 2 is set to 10 sooV. Note that the aluminum plow drum of the holder 10 is of II type.

A position Kll opposite to the holder IK is provided in close proximity to the image agent support 3.

As an example, a conductive rubber roller of straight 4IL40mm is used. This conductive rubber roller is made of conductive rubber 5 on a uniform KJI with a thickness of 5-0 layers to the core metal 4 of the direct connection (fund).
has been established.

In this example, a conductive agent such as carbon black, Tie, -8nO is added to the silicone rubber A as the conductive rubber 5.

A compound in which particles of the compound were dispersed was used.

As the conductive rubber 5, in addition to silicone rubber, conductive materials such as molybdenum, urethane rubber, nitrile butadiene rubber, in-prene rubber, fluororubber, chloroprene rubber, butyl rubber, etc. can be used.

In addition, the conductive rubber 0 layer thickness may be S■ or more or 5■ or less, and if the i[R of the conductive rubber is hard, a thicker layer is desirable @ conductive rubber S In this example, a resistivity of 1 G'ntxto is used, but it may be higher or lower than this.

However, in order to prevent leakage of 'am bias 6 and electrostatic voltage ll62, it is desirable that the value is 104 or more.

Furthermore, since it is necessary to work as a ms's pole in order to produce a positive effect of -, a conductive rubber S having a high resistivity of 10" klts or more is not desirable.

Holder l and developer carrier 30 facing each other, 1. While placed -
is set at 80 units m in the book*1ias (9)
~300.11010111110(, % deviation alWc
It's okay to set a.

On the other hand, a hopper 8 for storing the developer is provided above the developer carrier 3, and the developer 7 is sent to the surface of the iA agent carrier 3 while being stirred by stirring blades 9. The IA agent sent to the developer carrier 3j1m is transferred to the iA agent carrier 3.
The zero rotation sends it to the regulating member IO. Rules w4I
The I material 1G is in pressure contact with the dispensing support 3 of 3A to form a curve, and the pressure at the 41 point (DB: 41) is about 20017d. This pressure is obtained by the elasticity or deformation restoring force of the regulating member IO. , in this example, the thickness of the regulating member 10 is 8 G, 0
5m, -35w5 large 11's, developer carrier 30
It is attached to an insulating mounting plate 11 at an angle of 65° to the hoten.

The pressure of the pressure contact is O to the regulating member 100 insulation installation @ 11
With 4E, the position and angle with respect to the normal line, and the regulating member 10
It depends on the material. It is assumed that the pressure at the pressure contact point is a constant pressure such that the developer 7 does not aggregate much, and < 5
t/ad ~800r/m 0118.

Therefore, the thickness of the image agent 7 is regulated according to the deflection of the controlling member 10, and the charging bias 12 is also regulated.
A uniform, extremely thin O layer with a constant thickness is created while being negatively charged. In this example, about 33. The smO layer thickness was obtained.

As the voltage of the charging bias U, a value of -goo v is used, but a higher voltage may be used as long as the ζa collection of the developer due to discharge does not appear. In cases where the voltage is small or large, a voltage lower than this may be used; in this example, a range of -400V to -tsoovo was suitable. Furthermore, the layer thickness of No. 11 is determined by the voltage of the charging bias U, the ratio of curvature of the regulating member 100, the pressure of the pressure contact point, and 3iI.
The circumferential speed of the image agent carrier 30 (in this example, it is 140 cm/sec in the direction of the arrow). iI by applying charging bias
In my IA apparatus, which forms 70 layers of IA images on the copper agent carrier 3, it was difficult to make the layer thickness uniform within the above range.

The amount of charge of #4 image agent 7 is not clear, but II image agent 7 is *
Adjusting the ** potential generated by * gives -I to -5oo
vo@kai is suitable.

That is, when the value is low, the image clarity is low, and this value is likely to cause fog and fog.

lI2- represents the relationship between the charging bias and the surface potential OII of the developer 70 in this embodiment, and the way the developer is charged differs depending on the resistivity of the developer.

By the way, the value of the surface potential of the 04 image agent blade is due to frictional charging with the regulating member 1G, but the value of the surface potential of the mzso buds is O, which is below the range of progress O4, and this relaxation is clearly regulated. It can be seen that the member 10 is charged and dissipated.

Furthermore, the specific resistance of the developer 70 is 10' to 1014Ωcmo
It is desirable to use the developer 1147 which is efficiently charged and has a low WAO specific resistance. Also,
If one transfer is required, the specific resistance is lower than 0J6t.
If you use t image preparation 7, the transfer efficiency will be poor, but you can use it effectively! I Book Preparation 70 Specific Resistance 1G" ~ 1014Ω1 is stormy.

The upper limit of specific resistance, lo'b am, was set at -500-1soo, which is a relatively low voltage range for charging bias.
If the charging bias voltage is set to a higher voltage in the case of V, even if the iA image preparation 70JtS resistor has a value of more than 1G"IQ scratch, it will be charged.

In this example, negative m charging bias and WI of bridging agent 7 are used.
Although I am talking about solder, it is exactly the same for positive polarity.

In this example, the developer 7 is styrene-acrylic 1.
A material with a specific resistance of 1O11Oall in which carbon black was dispersed in 10% of fat was used.

Figures 11 and 3 show the angle (.0)゛ and # between the tip of the member 10c) and the developer carrier 3 with respect to the modulus 11 in this example. lK image agent-Shintai 1
The layer thickness (mm) and the surface potential (v) of the developer 7 formed on the surface of the developer 7 formed on
).

When the curved angle (.) of the regulating member IO is 600 or more, an extremely thin layer of developer 70 having a thickness of 30/III or less can be formed. Furthermore, the charging efficiency of the agent 7 is also extremely high (Next, the developer 7, which is charged and formed in a thin and uniform layer thickness on the developer carrier 3, is charged by the electrostatic drum on the holder l. 2, it attaches itself to me and makes me red.

In order to increase the amount of developer attached to the electrostatic #2, the circumferential speed of the carrier 3 should be increased, but considering the fog and -10@ collecting property, it is 1.0 to 2.0 times 04
It is desirable that the

In this example, a developing bias 6 of -zoov is applied through the electrode brush 13 and the core metal 4 in order to eliminate fog due to residual charges on the holder l.

'iA after me! The filling material 7 remaining on the developer carrier 3 is returned to the hopper 8 by the rotation of the developer carrier 3, but once removed from the image of the developer carrier 31N by the blade 15, the developer 7 This prevents the developer from being fixed to the @ surface of the developer carrier 3.

In order to prevent the developer 7 from scattering due to long-term use, a cover 14 is provided in this example.

With the above operation, 1smjI! without fogging! A clear image with a resolution of 6.3 lines/wm was obtained @ 4th
The figure is an example of a different form of Honya.O This example has a 5t odor stone as a development Mm divine body □□□
It is a metal roller that has been waiting for i1i to have a bumpy OS. Tsuba]
The depth is 108 to 10,084 degrees.

In this example, the regulating member lO of gold llI four strokes like jIllllll is not suitable (conductive elastic body oasis).
Material 16 is used. This is because the metal regulating member 10
Now, it is easy to attach the developed copper loss object 2011g4.
This is to wear away the unevenness of the lNi.

Furthermore, conductive elasticity, lA11I of the body! The conductivity of the ls material 16 is good if the resistance of the developer 7 is low, and it is not a problem if the developer layer on the carrier part is thick, but it is not a problem if the resistance of the ij4 developer 7 is low. For example, 10'01
As mentioned above, when the layer thickness is set to 80 pm or less,
Since leakage of charging bias occurs, it is desirable that the specific resistance of the regulating member 16 be within the flaw range of 10'01 to 10. co111W11fc @ constant L ri jlim ha IO'o
Charging bias leakage occurs below fi 10
This is because when the resistance is 14Ω1 or more, the developer 7 is not charged with tin because of efficiency. When a relatively low voltage is used as the charging bias, it is desirable that the voltage be in the range of ~10''Ω1.

Further, in this embodiment, an AC voltage of 17 cm is used as the charging bias.
A bias voltage obtained by superimposing eight K il line current voltages is used.

In order to reduce the voltage, a capacitor is installed between the AC voltage 17 and the primary voltage 18, and this example has a capacity of 0.02V, although it varies depending on the AC voltage 170 and the waveform. was used.

Direct mt pressure 18 car 200~-1000V011fi to5[11EjE17 is $00~-1000V 1m!
When Preparation 7 is charged, halftone reproduction with good gradation and an image with a unique quality can be obtained.

This salt mountain uses biased voltage as a charging bias.

This is thought to be due to the fact that the developer 7 was created with a distribution of charge amount.

Furthermore, when the biased voltage was used, the amount of developer 70am was reduced, and it was possible to increase the pressure of the regulation S material 160 fE 11 points.

Things that can be used as the conductive elastic regulating member 16 include a material made of what is normally called rubber and a film made of conductive plastic. It is also possible to use Alta coated mylar in a desired size on the layer provided with the IIa layer, and use the aluminum layer as the developer carrier 21) IIK.

In this example, a lo'omo regulating member 16 made of Teflon rubber dispersed with carbon black to make it conductive was used.

With this device, DC voltage m -5oov, AC voltage 17-800V, 141181000 Hz
When I applied the image, I was able to obtain a halftone image with excellent high image quality and no fogging.

[IJ & light effects]

As described above, according to the present invention, there is no regulating member that requires precision and microfabrication, no complicated l6jIO, and a uniform and extremely thin charged image agent with an extremely simple structure. A layer can be formed on the carrier and a fog-free image faithful to the original can be obtained.

[Brief explanation of the drawing]

giml is a cross-sectional view showing one embodiment of this paper, (112- is the charging bias and structure
, j13■ is an explanatory diagram showing the curved angle of the regulating member 10, the layer thickness of the 1jIh image agent, and the 0@electric state of the image agent, and FIG. 4 is a wfrrfJ diagram showing another example of the present invention. be. l...Holding body 3. J...Carrier 5...
Conductive rubber 7...Developer 10, 16...Regulation member Minoru...Charging bias 19...Capacitor 17...AC pressure 18...DC voltage agent License agent Nori Chika Hire Yu (1 person): 1 Figure 1 Figure 2 Figure 8

Claims (4)

[Claims] (1) The different image agent is supplied to the different image agent carrier which rotates close to the IS holder which holds the l1iiK electrostatic II image, and when a thin (uniform i+vn layer is formed) by the regulating member, the amount of the image is controlled. Apply a voltage to the member and set the developer to either positive or negative 0f.
llkK bud electric exclusively, 'mouth the developing plate that forms the developed image on the static turtle S image, upper l! Parent-parent member j] 1lI
The advantage is that the developer O is charged and layered while it is in pressure contact with the carrier and is in a curved state.
Place. (2) The tip of the regulating member that is pressed against the II developer carrier and has a curved shape, and the developer carrier and the oaso** are 0 with respect to the normal line.
ii-Eccentricity described in section 1 of OII Fields (3) Patent request o1111 JIIt item and JIz item - 0fA my device, characterized in that a conductive 60 elastic body is used as a storm part member, and the specific resistance of the damping control material is set to 10'Q at to W15 scratches. (4) Patent 1 seeking 0$ C, characterized in that the voltage applied to the regulating member is a biased voltage that superimposes a DC voltage on an AC voltage.
111 The developing device described in Iris 1, mg, and Turtle 3.