JPH0262310B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric field curtain device used in electronic copying machines and the like, and particularly to a single-phase exposure type electric field curtain device having a structure that can withstand long-term use.

In the conventional one-phase exposed electric field curtain device, an electrode (V phase) is provided on the insulating substrate layer 6 as shown in FIG.
2 and an electrode (W phase) 3, a surface dielectric layer 4 is connected to the insulating substrate layer 6 through an internal dielectric layer 5 on the upper surface thereof, and exposed electrodes are provided at regular intervals on the surface dielectric layer 4. (U phase) 1 is installed, making it a so-called three-phase structure.

FIG. 2 is an enlarged view of the exposed type electric field curtain device shown in FIG. 1, in which the exposed electrode 1 emits many bipolar ions because it is in contact with air. These bipolar ions contribute to removing and charging the powder particles (not shown) to be transported, thereby improving the transfer ability. Since the collision concentrates on the upper part, that is, the surface I part of the surface dielectric, this part is gradually destroyed, and eventually a hole is formed that leads to the buried electrode 2 or 3 from the surface of the surface I directly above the surface dielectric, and the exposed electrode 1
A spark discharge occurs between the electrode and the buried electrode 2 or 3, destroying the electric field curtain and impairing its long-term use.

In Figure 2, a=3mm, b=0.1mm, c=0.1
mm, the surface dielectric layer 4 was made of polyimide, the inner dielectric layer 5 was made of silicone rubber, and an AC voltage of 4.5 KV was applied between the electrodes to perform a durability test. It has reached the end of its lifespan and is no longer usable.

In addition, in the above test, the conditions of a≫b+c were as follows:
This is because if the dimension a is small, the intended function cannot be achieved.

The purpose of the present invention is to obtain an excellent electric field curtain device that solves the above-mentioned drawbacks, and eliminates the collision of bipolar ions to the above-mentioned surface dielectric directly above I, thereby greatly extending the life of the electric field curtain sheet. It is designed to extend the length of the electrode and improve the particle transport ability, and its configuration consists of buried electrode groups 2, 2', 2''...
2 ⁿ and the floating electrode group 8, 8'......8 n and 9, 9 ^' ......9 on the surface I part of the surface dielectric 4 directly above the buried electrode group 3, 3 ^' ,...3 n. ⁿ is provided.

In addition, exposed electrode groups 1, 1'...1 ⁿ , buried electrode groups 2, 2'...2 ⁿ , and buried electrode groups 3, 3'...
... ³ⁿ has the same configuration as the conventional one.

Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 5 show this embodiment. In FIG. 3, an exposed electrode group 1 made of copper with a width of 0.3 mm and a thickness of 35 μm is placed on a surface dielectric layer 4 made of polyimide with a thickness of 75 μm; 1'......1 ⁿ , floating electrode groups 8, 8'......8 ⁿ , and floating electrode groups 9, 9'......9 ⁿ , each having the same width, thickness, and material, and with a width of 3 mm. Arrange them keeping the distance between them. Next is the thickness
A surface dielectric layer 4 is formed on an insulating support layer 6 made of polyester having a thickness of 100 μm, and a group of buried electrodes 2, 2' having the same width, the same thickness, and the same material as the floating electrodes 8 and ⁹ are formed.
and buried electrode groups 3, 3'... ³ⁿ are arranged using etching means as shown in FIG.

Next, the sheet A obtained as shown in FIG. 3 and the sheet B obtained in FIG. 4 were joined together with an internal dielectric layer 5 made of silicone rubber having a thickness of 100 μm interposed therebetween. At this time, floating electrode groups 8, 8'......8 n and ⁹ , 9 are placed directly above the buried electrode groups 2, 2'...2 ⁿ and the buried electrode groups 3, 3'...3 ^n. ′...
...9 Position ⁿ .

When a three-phase alternating voltage is applied to the terminals 10, 11, and 12 of the floating type electric field curtain with the above configuration, ions generated from the exposed electrode group collide with the adjacent floating electrode group, and the electrons are delivered to the floating electrode and floated. Increase the potential of the electrode. Then, as shown in FIG. 6, electric lines of force 13 are generated between the floating electrode and the buried electrode.
However, the concentration of the electric lines of force 13 was slower than in the case without the floating electrode, and the collision of ions against the dielectric layer 4 was eliminated, so the rate of deterioration in this portion became extremely slow. As a result of the experiment, while the conventional electric field curtain device had a service life of about 1000 hours, it was found that the lifespan of the present invention far exceeded 2000 hours, and the powder conveyance capacity was also improved by about 30%. .

As mentioned above, in this embodiment, the three-phase type is described in detail, but this is not necessarily the case, and it goes without saying that the same effect can be obtained even if the type is single-phase, four-phase, or more. A similar effect can be obtained in an electric field curtain device in which a is embedded.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view taken in a direction perpendicular to the electrode extension direction of the single-phase exposed electric field curtain device, and Figure 2 is a partial cross-sectional view showing the ion flight path during operation of the electric field curtain device shown in Figure 1. 3 is a partially cutaway plan view of a sheet A consisting of a surface dielectric layer, an exposed electrode group, and a floating electrode group that constitute a part of an embodiment of the present invention, and FIG. 4 is a partially cutaway plan view of a sheet A in which the present invention is implemented. FIG. 5 is a partially cutaway plan view of a sheet B consisting of an insulating substrate layer and a group of buried electrodes constituting a part of the example; FIG. FIG. 6 is a state diagram of electric lines of force formed between the floating electrode and the buried electrode. Symbols in the figure: 1...Exposed electrode, 2, 3...Buried electrode, 4...Surface dielectric layer, 5...Inner dielectric layer, 6...
...Insulating substrate layer, 7...Ion flight path, 8, 9...
...Floating electrode, 10, 11, 12...
U, V, W phase terminals, 13... Lines of electric force.

Claims (1)

[Claims] 1. A floating type electric field characterized by arranging a floating electrode whose ends are not electrically connected in parallel with the exposed electrode on the surface dielectric layer directly above the buried electrode of a one-phase exposed electric field curtain device. curtain device.