JPS58174974A - Developing device - Google Patents

Abstract

PURPOSE:To make it unnecessary to control toner density by only replenishing a liquid developer, and to obtain an image having a good quality without treating a form sheet, by rotating at a relative speed both sleeve which is placed in a conductive liquid developer and is provided with a hollow on the circumferential face, and photoreceptor. CONSTITUTION:In a conductive liquid developer 12, the lower part of a conductive rotating sleeve 10 provided with a hollow 10a on the circumferential face is immersed, is opposed to a photoreceptor 1 without contacting each other, and are rotated at a relative speed. When a latent image on the surface of the photoreceptor 1 gradually approaches the sleeve 10, the electrostatic field becomes strong gradually, electric charge is charged into the developer 12, and also when the gap to the photoreceptor 1 becomes narrow, the developer 12 on the hollow 10a becomes a droplet and jumps toward the latent image of the photoreceptor 1, and a visible image is formed. In this way, since the developer is made to adhere to the photoreceptor by electrostatic power, it becomes unnecessary to control toner density, and the developer is made to adhere by rotating the sleeve, therefore, this developing device can be applied to a high speed printing machine.

Description

DETAILED DESCRIPTION OF THE INVENTION In particular, the present invention relates to a liquid type developing device that uses a liquid ζ for development.

Conventionally, the liquid development method used in electrostatic recording devices that develop electrostatic latent images of Yuzu and electrophotographic devices using the same has been broadly divided into dry development methods and wet development methods.11. 'tノ': It can be classified into. There are two types of dry development methods.
There is the y method, and the U two-component development method charges the toner by mixing the gear 1j and the toner to form an electrostatic latent image and its charge σ).
This is a method of developing based on balance. This method has good image quality, is widely used in copying machines from low speeds to high speeds, and is technically well established. A toner density control mechanism is required, and the carrier has a limited lifespan, so it must be replaced periodically.The one-component development method does not require a carrier, so there is no need to worry about the lifespan of the developer or the control of toner density. WM i')' does not occur, but the image quality is poor and the paper needs to be treated with high resistance. On the other hand, the wet development method uses an isovar solution, which is a petroleum-based bath, so it must be handled with great care, but the image quality is good.

However, it is difficult to print with high density, and the other problem is that paper must be selected.

This invention eliminates the above-mentioned point of view, and eliminates the need for less control (1-ner poison), and also reduces the lifespan of the developing device (this).
Y4 1.
Il1's belly 4 is removed 1ri 2ill j, and the electrostatic latent image is developed by removing the 1st quality of 11↓ to the extent that it reaches the graphia mark, and 2nd scraping it so that it can be used without processing BAA 4. The object of the present invention is to provide a liquid type developing device that represents a typical image.

That is, the present invention uses a conductive developer as a developer, and rotatably disposes a conductive sleeve having a recess on its circumferential surface in the developer stored in a tank.
The sleeve and the photoreceptor are faced to each other without contact,
This is characterized in that both of them are rotated at a relative speed of one.

Next, embodiments of the present invention will be described with reference to Figures +--+ti.

In FIG. 1, the surface of a photoreceptor 1 is charged with a charge by a charger 2, and when an original 3 is exposed to light on the photoreceptor using an exposure nostem 4, a latent image of a journey 3 is formed on the photoreceptor. The latent image is developed by the developing device 5 and converted into a visible image.Meanwhile, the paper in the hopper 6 is fed at the timing when it can be transferred, is charged by the transfer d?f7, and is converted into a visible image on the photoreceptor. (i1'' Obtain a copy image on the paper by suction with the silent energy. Remaining 1st beam that could not be transferred 1) -ning mechanism 8
C) removed by The surface charge remaining on the photoreceptor is removed by the charge removing light from the remover 9, and the electrophotographic process is completed.

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

Reference numeral 10 denotes a conductive spout, and a large number of small depressions 10a are provided on the surface of the sleeve 100. The diameter of this depression 10a is 0002 to 1.0 mmφ
, No. 6: Sa is formed as densely as possible with about 0005 to 05 cabinets.

In the present invention, a conductive developer is used as a developer, and R/R1
The sleeve 11-10 is rotatably arranged in the developer 12 housed in the developer 12, and the sleeve 10 and the photoreceptor 1 are made to face each other without contacting each other, and both are rotated at a relative speed. I am 17 years old.

37th (at, (bl) is a schematic diagram illustrating the principle of the present invention.

The sensor body 1 and the sleeve 10 are rotating at a relative speed. The year mark 10a provided on the surface of the sleeve 10 holds a border g12. As the sleeve 10 gradually approaches the photoreceptor 1, the image shown in FIG. 6 (a)
), the electrostatic field gradually becomes stronger, and charges are injected into the developer 12. Furthermore, as the gears between the two become narrower, the electrostatic field becomes stronger as shown in Figure 3 (bl), and eventually the viscosity of the developer 12, the surface strength, and the gravity go against it, forming droplets toward the latent image on the photoreceptor, and the developing Liquid 12 flies and adheres 7
, one visible image is formed.

According to experiments, the circumferential speed of the photoreceptor 1 is 25 to 150 cm/
SeC, the relative speed with the sleeve 10, the change is about 02 to 10 times, the cap between the photoreceptor 1 and the sleeve 10 is 005 to 1
．． About 8m+n, the potential difference between the photoreceptor latent image and the sleeve is 7
1. Desirably 0V or more. Alternatively, a bias pressure (2) may be applied to the tubes 11 and 10 to maintain the six-point difference. The viscosity of the developer is 05 to 150'CpS, the surface tension is 2 to 100 dyne/z, and the resistance value is 108 J-1, -.
The developing solution may be water-oil or oil-based. If the viscosity is high, the developing speed will be slow. If the surface tension is strong, a large potential will be required.
The droplets tended to become larger, and when there were fewer, the image became blurred. Furthermore, if the diameter of the depressions 10a on the sleeve 10 is small, the density will not be high, and if the number of depressions 10a is large, the resolution will be poor. If the gear between the photoreceptor and the sleeve is too narrow, it will cause a trailing image, and if it is too wide, the image will be distorted.
The sleeve and the photoreceptor are rotated at a relative speed (with a relative speed) using a liquid, and the developing solution held in the depression of the knob 11 by electrostatic force is attached to the photoreceptor. 3k?
11ll 4aq+ is no longer required, and the printing process can be completed simply by replenishing the developer, and the mark 111 can be printed with good image quality without processing the paper. Furthermore, since the sleeve is rotated and the liquid is applied, it has an effect that can be applied to high-speed printing machines.
1.

[Brief explanation of the drawing]

Fig. 1 shows the concept of a copying machine to which the developing device according to the present invention is applied, and Fig. 2 is a cross-sectional view of the developing device according to the present invention. be. 1... Photoconductor, 5... Developing device, 10... Sleeve,
1 []a...I'm old. Figure 3Cb)

Claims (1)

[Claims] (1) In a developing device that develops an electrostatic latent image into a visible image, a conductive developer is used as the developer, and a recess is provided on the circumference of the developer stored in a tank. 1. A developing device characterized in that a sleeve is rotatably disposed, the sleeve and a photoreceptor face each other without contact, and the two are rotated at a relative speed.