JPS62135852A - Solid-state discharging device - Google Patents

Abstract

PURPOSE:To reduce the cost of a power source greatly by providing an AC voltage applying means which generates ions nearby the 2nd electrode and a rectifying circuit which is connected between the 1st electrode and ground. CONSTITUTION:When the 1st electrode 2 and a body 5 to be charged are short- circuited and the AC voltage is applied between the 1st electrode 2 and the 2nd electrode 3, a charging current IC flows through an ammeter 10. Namely, a positive voltage based upon the 1st electrode 2 is applied to the 2nd electrode 3 within a range of 0<t<t1 when a point A is regarded as a reference point, and an electric field is produced between the grounded object body 5 and the 2nd electrode 3 in such a direction that positive ions are charged, thereby sticking the positive ions on the surface of the objective body 5. In a range of t1<t<t2, on the other hand, a negative voltage based upon the 1st electrode 2 is applied to the 2nd electrode 3 and an electric field is established between the object body 5 and the 2nd electrode 3 in such a direction that negative ions are charged, so the surface of the object body 5 is charged to the negative polarity and a negative current flows through the ammeter 10. Consequently, the need for a DC power source is eliminated and the cost of the power source is reduced greatly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a solid-state discharge device that is used as a charge removal device in an electrostatic recording device, an electrophotographic device, etc., and can be applied to various fields as a discharge device and an ion source. .

(Prior Art) FIG. 4 shows electrical connections of a solid state discharge device according to a conventional example.

The solid state discharge device 1 is composed of a dielectric 4 and a first electrode 2 and a second electrode 3 disposed with the dielectric 4 sandwiched therebetween. 1st above
By applying an AC voltage between the electrode 2 and the second electrode 3 by the AC voltage applying means 6, a corona discharge occurs between the charge induced on the surface of the dielectric 4 and the second electrode 3.
Positive and negative ions are generated near the second electrode 3. Therefore, by applying a bias voltage between the second electrode 3 and the object to be charged 5 by the bias voltage applying means 8 to form a DC electric field, only ions of necessary polarity among positive and negative ions can be applied. is accelerated, and the object to be charged 5 can be charged to a predetermined polarity.

Next, the structure of another conventional example is shown in FIG.

This conventional example differs from the example shown in FIG. 4 in that the bias voltage applying means 8 is connected to the second electrode 3 and
The point is that it is connected between the first electrode 2 and the object to be charged 5, rather than between the first electrode 2 and the charged object 5.

By setting the application point of the bias voltage in this way, the following effects can be obtained. That is, in the mechanism shown in FIG. 4, the electric field between the second electrode 3 and the charged object 5 is
Although it is formed only by the bias voltage application means 8, according to the connection mechanism shown in FIG. Since it is formed by voltages superimposed in the same direction, a large electric field is obtained and charging efficiency is greatly improved.

However, in all of the conventional examples described above, in addition to the AC voltage application means 6 for causing corona discharge, the bias voltage application means 8 for directing ions of necessary polarity toward the charged object 5 are provided as separate power supplies. Because I needed it,
This increases the power supply cost of the device and is disadvantageous to miniaturization and weight reduction.

(Purpose) The present invention was made based on this background,
It is an object of the present invention to provide a solid state discharge device in which power supply costs are significantly reduced by removing the bias voltage application device required in conventional solid state discharge devices.

(Structure) For this purpose, the present invention is characterized in that a rectifier circuit is provided that is connected between the first electrode and the ground, and only ions of one polarity are attracted to the charged object according to the rectification direction of the rectifier circuit. It is.

Hereinafter, one embodiment of the present invention will be described based on the drawings. still,
The same parts as in the conventional example are given the same reference numerals.

FIG. 1 shows electrical connections of a solid state discharge device according to an embodiment of the present invention.

In the figure, a solid state discharge device 1 is composed of a first electrode 2 and a second electrode 3 disposed with a dielectric 4 in between, and an AC voltage applying means 6 between the first electrode 2 and the second electrode 3. By applying an AC voltage, a positive voltage is generated near the second electrode 3.
Negative ions are generated.

Here, as shown in the figure, by connecting a rectifier circuit 7 between the first electrode 2 and the charged object 5, only ions of one polarity can be applied to the charged object according to the rectifying direction of the rectifying circuit.
It is attracted to and becomes electrically charged.

This operation will be explained in detail below. Figures 2A to 2C
The figure is a diagram for explanation, and the configuration of the solid-state discharge element 1 is the same as that shown in FIG.
It is divided into cases. In FIG. 2A, the first electrode 2 and the charged object 5 are directly short-circuited without using a rectifier circuit. When an alternating current voltage is applied between the first electrode 2 and the second electrode 3 in this connected state, a charging current (2) as shown in FIG. 3A (bl) flows through the ammeter 10. That is, as shown in FIG. If the point indicated by A is used as the reference point,
In the range of Q<t<t in FIG. 3A, the second electrode 3
A positive voltage is applied to the first electrode 2 as a reference, and an electric field is formed between the grounded charged object 5 and the second electrode 3 in the direction of charging positive ions. Therefore, the positive ions generated in the vicinity of the second electrode 3 adhere to the surface of the charged object 5 to be positively charged, and an induced current is shown on the ammeter 10.

Next 1. In the range <1<12, a negative voltage is applied to the second electrode 3 with respect to the first electrode 2, and a direction is applied between the charged body 5 and the second electrode 3 in a direction to charge negative ions. Since an electric field is formed, the surface of the charged object 5 is negatively charged, and a negative current flows to the ammeter 10. Furthermore, Figure 3A (
al is a voltage waveform (sine wave) applied by the AC voltage applying means 6.

Next, the operation of the circuit shown in FIG. 2B will be explained.

The circuit shown in this figure is a case where a rectifier is connected between the first electrode 2 and the charged object 5 so that the direction from point B to point A in the figure is the forward direction. When an alternating current voltage is applied between the first electrode 2 and the second electrode 3 in this connected state, a current as shown in FIG. 3B flows through the ammeter 10.

That is, if the point indicated by A in Fig. 2B is the reference point, then the third
In the range of 0<t<t in Figure B, a positive voltage is applied to the second electrode 3, and the charged body 5 and the 21i-th electrode 3
An electric field is formed between them in a direction that charges positive ions. Therefore, positive ions near the second electrode 3 are transferred to the charged body 5.
The charging target 5 moves towards the surface of the object 5 to be charged. At this time, current flows in six directions from B, which is the forward direction of the rectifier 7.

Furthermore 1. In the range <1<12, a negative voltage is applied to the second electrode 3 and ions are generated, but the negative ions do not move toward the charged object 5 and are transferred to the second electrode 3.
Electrode 3. or on the surface of the dielectric 4. This is because since the rectifier 7 is connected, charge movement in the opposite direction does not occur. In this way, in the circuit configuration shown in FIG. 2B, the charging current is . flows only in the positive direction, resulting in a waveform as shown in Figure 3B,
The object to be charged 5 is positively charged.

Furthermore, in the circuit shown in FIG. 2C, since the connection direction of the rectifier 7 is reversed from that in FIG. 2B, the direction in which the charging current I flows is also reversed from that in FIG. As shown, the current flows only in the negative direction, and the surface of the charged object 5 is negatively charged.

As described above, according to the present invention, by connecting a rectifier circuit between the first electrode 2 and the charged object 5 without using a power source for applying a bias voltage, the charged object can be controlled. It can be charged to one polarity.

When the circuit configuration according to the present invention was actually operated, a sufficient charging current could be obtained as shown in the table below.

However, the frequency is 5 KHz, and the gap between the charged body and the solid discharge element is 4 squares. (The unit of charging current density is μA
/all) (Effects) The present invention is as described above, and the solid-state discharge device according to the present invention uses only an AC power source and does not require a DC power source, so power supply costs are significantly reduced. The circuit configuration becomes Mjl. Making the device smaller and lighter,
Alternatively, it is possible to reduce power consumption.

[Brief explanation of drawings]

FIG. 1 is an electrical wiring diagram of a solid state discharge device according to an embodiment of the present invention, FIGS. 2A, 2B, and 2C are circuit diagrams for explaining the function of a rectifier circuit, which is the main part thereof, Figure 3A (
al, (bl, Figures 3B and 3C are respectively 2A
The waveform diagrams corresponding to FIGS. 2B and 2C, and FIGS. 4 and 5 are electrical connection diagrams of solid-state discharge devices according to different conventional examples, respectively. 2... First electrode, 3... Second electrode, 4... Dielectric, 6... AC voltage application means, 7... Rectifier circuit. Figure 3A Figure 3B ri ■ Figure 3C Figure 4 Figure 5

Claims (1)

[Claims] An alternating current voltage is applied between a dielectric, a first electrode and a second electrode disposed through the dielectric, and the first and second electrodes to generate ions near the second electrode. A solid state discharge device comprising: means for applying an alternating voltage to generate the alternating voltage; and a rectifier circuit connected between the first electrode and ground.