JPS608759A - Measuring device of electric charge distribution of toner particle - Google Patents

Abstract

PURPOSE:To obtain an electrode, which generates an electric field having a uniform intensity, with a simple structure and an electrode arrangement which does not disturb an air current, by arranging a side wall electrode, which generates an electric field, in the downstream side of a filter which gathers toner particles. CONSTITUTION:Side wall electroes 20 are arranged on the inside wall of a tube part in the downstream side of a filter 12 as extensions of upstream side wall electrodes 10 in the downstream side of the filter 12 and are constituted with approximately rectangular tin oxide films coated on the wall part of the glass tube part similarly to side wall electrdoes 10, and the similar voltage is applied to them. It is desirable that the length of side wall electrodes 20 is >=1/2 of the diameter of the tube. A uniform electric field is generated even in the part of the filter 12 by the cooperation of side wall electrodes 10 and 20, and the disturbance of the air current near the filter 12 is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention produces an electric field of substantially uniform strength and an air flow of substantially uniform velocity flowing through the electric field in an internal chamber of a housing, and The present invention relates to a toner particle charge distribution measuring device for introducing toner particles into a toner particle and measuring the charge distribution of the toner particles.

(Prior Art) FIG. 1 is a configuration diagram of this type of device without showing the main parts. In the figure, 1 is a suction pipe, which is a glass tube with a narrowed middle part.
Moreover, its inner surface is coated with tin oxide, and the tin oxide is grounded. An annular air filter material 2 is disposed around the opening of the suction pipe 1, so that air can flow into the suction pipe 1 from the surrounding area. The air filter material 2 enters the suction pipe 1 in the direction of the arrow to form an air layer that coaxially surrounds the toner particles (zamble), and is a suitable material for the air from the compressed air inflow path 15. It is a porous member that exhibits air resistance and removes dust, etc., and is electrically conductive around the pores. 3 is a nylon filter for introducing the main air flow into the internal chamber 5 of the housing 4. , this main airflow is then passed through a nylon mesh screen 6
, honeycomb straight air flow generator7. It passes through the nylon filters 8 and 9 and flows downward in FIG. 1 with a substantially flat flow velocity distribution and at substantially the same flow velocity as the air flowing out from the suction pipe 1. Reference numeral 10 denotes a side wall electrode for deflection, which is made of a large number of substantially rectangular tin oxides coated on the glass wall surface of the housing 4. Different voltages are applied to the side wall electrodes 10 so that a uniform electric field is formed within the interior chamber 5 of the housing 4.

Reference numeral 11 denotes a grid-like bottom electrode having air permeability, which is composed of electrical wires arranged at approximately equal intervals and nylon wires arranged at approximately equal intervals in a direction perpendicular to the electrical wires. This creates a smooth potential gradient so as not to distort the particle pattern attached thereto. The resistance to the bottom electrode 11 is formed by coating one edge of the grid with a slurry of colloidal graphite and molybdenum disulfide to create a coated resistor with an end-to-end resistance of, for example, 20 MΩ. This bottom electrode 11
is supported by a glass frit filter 14 attached to the base 13.

In this device, the toner particles are guided through the suction pipe 1 into the internal chamber 5 of the housing 4 by toner particle introducing means, and while descending, the toner particles are transported by electrodes 10 and 11 in a direction perpendicular to the central axis of the suction pipe 1 ( direction of the electric field),
It is attached on the filter 12 for detecting toner adhesion. The amount of displacement in the deflection direction is a function of the size and charge of the toner particles.

By the way, in the conventional device using the side wall electrode and the bottom electrode to form a uniform electric field as described above, the bottom electrode has a complicated structure, is troublesome to manufacture, and requires expensive materials. The problem is that the cost is high. Furthermore, even with a lattice structure, there is a problem in that it actually disturbs the airflow of the filter on the upstream side.

(Objective of the Invention) The present invention was made in view of the above problems, and its object is to obtain an electrode that forms an electric field of uniform strength with a simple structure and an electrode arrangement that does not disturb airflow. There is a particular thing.

SUMMARY OF THE INVENTION The present invention achieves this object by creating an electric field of substantially uniform strength and an air flow of substantially uniform velocity flowing through the electric field in an internal chamber of a housing, and disposing toner particles in the internal chamber. In a toner particle charge distribution measurement device that measures the charge distribution of toner particles, a side wall electrode that forms an electric field of approximately uniform intensity is provided not only on the upstream side but also on the downstream side of the filter that collects the toner particles. It is also characterized by the fact that it is also provided with.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a configuration diagram showing a main part of an embodiment of the present invention.

In this figure, the same parts as in FIG. 1 are given the same reference numerals. In the figure, 20 is a side wall electrode provided on the inner wall of the tube on the downstream side of the filter 12. The side wall electrode 20 is arranged in such a manner that the side wall electrode 10 on the upstream side of the filter 12 is extended to the downstream side of the filter 12. Like No. 10, it is composed of a substantially rectangular tin oxide film coated on the wall surface of the glass tube portion, and the same voltage is applied. The length of this side wall electrode 20 (in the tube axis direction) is preferably selected to be 1/2 or more of the tube diameter.

With this configuration, a uniform electric field is generated even in the filter 12 section due to the cooperation of the side wall electrodes 10 and 20, so the bottom electrode in the conventional device is not required, and the turbulence of the air flow near the filter 12 is reduced. It disappears. This l [
This makes it possible to measure highly laminated layers. Further, since the bottom electrode is not required, the material and manufacturing process thereof are also eliminated, and the cost of the device can be reduced.

In the above embodiment, the side wall electrodes 10 and 20 are formed of a tin oxide film, but other conductive metal films may be used, or the metal plates may be formed of a metal plate that does not disturb the air flow. You can also paste it like this. Further, the configuration other than the inventive portion shown in FIG. 2 is the same as that in FIG. 1, but is not necessarily limited thereto.

(Effects of the Invention) As explained above, according to the present invention, an electric field of uniform strength can be obtained with a simple electrode structure.

Moreover, this electrode prevents the air flow in the part of the filter that collects toner particles from being disturbed.

[Brief explanation of drawings]

Figure 1 shows a conventional toner particle charge distribution measuring device.
Block diagram: FIG. 2 is a block diagram showing a main part of an embodiment of the present invention. 1... Suction pipe 2... Air filter 4... Housing 5... Internal chamber 10... Upstream side wall electrode 12... Filter 15... Compressed air inflow path 20
...Downstream side wall electrode patent applicant Roku Konishi Photo Industry Co., Ltd. Representative Patent attorney Fuji Osamu Ijima Figure 1

Claims (1)

[Claims] An electric field of substantially uniform intensity and an air flow of substantially uniform velocity traces flowing through the electric field are generated in the internal chamber of the housing, and toner particles are introduced into the internal chamber and the toner particles are charged. In a toner particle charge distribution measurement device that measures the distribution of toner particles, the side wall electrode that forms the electric field of substantially uniform strength is disposed not only on the upstream side of the filter that collects toner particles but also on the downstream side. A toner particle charge distribution measuring device characterized by: