JPH0338814A - Electronic component - Google Patents

Abstract

PURPOSE:To stabilize a pulse voltage and to enhance a heat-resistant property by providing the following: a nonlinear dielectric element in which electrodes have been applied to both faces; dumet terminals which have been connected to opposite faces of this element so as to be conductive; and a cylindrical housing member, made of glass, which has housed one part of the dumet terminals and the nonlinear dielectric element. CONSTITUTION:This component is constituted of the following: a nonlinear dielectric element 1 in which electrodes 1a, 1b have been formed on both faces; one pair of dumet terminals 2, 2 which have been connected to opposite faces of this element 1 so as to be conductive; and a cylindrical housing member 3, made of glass, which has housed one part of the dumet terminals 2 and the nonlinear dielectric element. A characteristic of the nonlinear dielectric element is not damaged; the element and lead parts are connected by a compression operation; the nonlinear dielectric element is housed inside the housing member made of glass; as a result, this element is durable even when it is left at a high temperature of 150 deg.C or higher. Thereby, a high heat-resistant property of an element required for a starting circuit of a high-pressure sodium lamp is secured, and this element can be manufactured at low costs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the invention] (Industrial field of application) The present invention relates to a pulse generator for discharge lamps, particularly non-pulse generators used for starting and lighting high-pressure metal vapor discharge lamps such as high-pressure sodium lamps. Related to improvements in electronic components such as linear dielectric elements.

(Prior Art) FIG. 5 shows an example of a lighting circuit for a high-pressure sodium lamp incorporating a starter. In the figure, 21 is an arc tube of a high-pressure sodium lamp.

2 is a starter for starting discharge of the arc tube 21; This starter 22 is connected in series with a non-linear dielectric element 23.
A semiconductor switching element 24 such as SS is connected, and a series circuit of a resistor 25 and a diode 26 is connected in parallel with the semiconductor switching element 24, and connected in parallel with the arc tube 21 via a thermally responsive switch 27. It is connected.

Reference numeral 28 indicates an outer sphere that houses the arc tube 21 and the starter 24. One end of this outer sphere 28 is connected to an AC power source 30 via a ballast 29 such as a choke coil. 31 is a power factor correction capacitor.

When the AC power supply 30 is turned on in such a circuit, the ballast 29. Thermal response switch 27. Resistance 25. Diode 26.
The non-linear dielectric element 23 is charged through a circuit including the non-linear dielectric element 23 and the non-linear dielectric element 23 . When the charging voltage of the non-linear dielectric element 23 reaches a predetermined value, the semiconductor switching element 24 becomes conductive, and the electric charge of the non-linear dielectric element 23 is rapidly discharged. At this time, the nonlinear dielectric element 23
This occurs due to the D-E hysteresis characteristic (see FIG. 6), and is applied to the arc tube 21 together with the power supply voltage. This will start the lamp. After the lamp starts, heat from the arc tube opens the thermally responsive switch 29 and the starter stops operating.

(Problems to be Solved by the Invention) By the way, in such a high-pressure discharge lamp, when the starter is housed in the lamp outer bulb, the circuit components must satisfy strict conditions.

In particular, the nonlinear dielectric element 3 is small and has high heat resistance.

It must satisfy various conditions such as long life and be inexpensive. However, in the conventional non-linear dielectric element, as shown in FIG. 7, electrodes 41 are formed on both sides of a dielectric element 40, and a pair of lead wires 42 are connected with solder 43 so as to sandwich the front and back electrodes 41-. After that, since the entire device was covered with phenolic resin 44, it had drawbacks such as not being able to be used at temperatures above 150°C. There are also inventions such as coating elements with special glass (Japanese Patent Publication No. 62-608).
04), but the process was complicated and expensive.

The present invention has been made in consideration of the above points, and is an electronic component used for generating high voltage pulses in a starter built in a high pressure discharge lamp such as a high pressure sodium lamp.
The purpose of this invention is to provide an inexpensive device that can stably generate a pulse voltage sufficient for starting, has excellent heat resistance, and has a long life.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a non-linear dielectric element having electrodes adhered to both sides, and a non-linear dielectric element having electrodes adhered to both sides, and a conductive connection to the opposing surfaces of the element. The present invention is characterized in that it includes a Dumet terminal, and a cylindrical glass housing member housing a part of the Dumet terminal and the nonlinear dielectric element. Further, in the above structure, a conductive elastic member is inserted between one or both of the non-linear dielectric element 1 and the Dumet terminal 2, respectively.

(Function) The function of the present invention having the above configuration will be explained. The structure of the present invention does not impair the characteristics of the non-linear dielectric element, the element and the lead portion are connected by crimping, and the non-linear dielectric element is housed within the glass housing member. , has durability even when left at high temperatures of 150°C or higher.

(Example) The present invention will be specifically explained below using Examples.

FIG. 1 is a structural sectional view showing an embodiment of the electronic component of the present invention. This electronic component includes a non-linear dielectric element 1 having electrodes la and lb formed on both sides, a pair of Dumet terminals 2, 2 electrically connected to opposing surfaces of the element 1, and one of the Dumet terminals 2. and a cylindrical glass housing member 3 housing the nonlinear dielectric element and the nonlinear dielectric element.

Next, an example of manufacturing the component will be described.

The nonlinear dielectric element is formed as follows. 10 each of BaCO3, TiO2, and ZrO2 as starting materials
0mo1%, 91mo1%, 9mo1% and MnC
09, W.O.

0.05W1% of each was added and blended, and wet mixed using a polyethylene pot and an agate ball.

This mixture was dehydrated, dried, and held at 1150° C. for 2 hours for temporary calcination, and then pulverized again using a polyethylene pot and an agate ball. Furthermore, after evaporating the moisture of this pulverized material, an appropriate amount of binder was added to it, and a disc with a diameter of 16.5 mm and a thickness of 0.6 to 2.0 φ was formed.
Pressure molding was performed using a 3 ton/c & press. Then 1300
It was baked at a temperature of 1400°C to 1400°C for 2 hours.

A silver electrode was baked on the thus obtained ceramic element, and then it was diced into 0.5 mm square chips, and then IPA
(isopropyl alcohol) and dried.

The chip was placed on a Dumet terminal housed in a cylindrical glass tube, the Dumet terminal was placed on top, the nonlinear dielectric element chip was sandwiched between the Dumet terminals, and the glass was sealed at 500 to 550°C. Ta. Thereafter, the pulse voltage was measured using the circuit shown in FIG. 2, and the values shown in Table 1 were obtained.

Table 1: Pulse voltage peak values As is clear from Table 1, if the base thickness is within 2.0 mm, it is possible to apply a good pulse voltage (200 (IV or more)) and start a high-pressure sodium lamp.Next The nonlinear dielectric is a ferroelectric material, which vibrates slightly when pulses are generated, and we conducted the following experiment with the idea that it could be used on thicker substrates if the stress was relaxed.

The nonlinear dielectric material is prepared in the same manner as in the above embodiment. After a chip of a nonlinear dielectric element was placed in a cylindrical glass tube, a conductive elastic part was placed on top of the chip, and then a Dumet terminal was placed and sealed with glass. Table 2 shows the characteristics of the pulse voltage.

As is clear from Table 2, it was found that a substrate of 2.0 nun could also be used.

In the above two examples, a substrate diced into chips was used as the nonlinear dielectric element, but it was confirmed that a substrate formed by dry molding, coated with electrodes, and baked was also effective.

Next, other embodiments of the present invention will be described.

FIGS. 3(a) and 3(b) are an exploded perspective view and an assembled sectional view of an electronic component as another embodiment.

The electronic component shown in FIGS. 7(a) and 8(b) includes the nonlinear dielectric element 7 described above, electrodes 8, 8 formed on the opposing surfaces of the nonlinear dielectric element 7, and the electrode 8. , 8, a dumet terminal 10.10 conductively connected to the elastic members 9, 9, and a part of this dumet terminal 10.10 and the non-conductive elastic members 9, 9. A cylindrical glass housing member 11 housing a linear dielectric element 7 is provided.

In this embodiment, the elastic members 9, 9 are approximately U-shaped, and one of the open ends is electrically connected to the electrode 8, and the other end is electrically connected to the Dumet terminal 10, respectively.

The Dumet terminal 10.10 has a disk-shaped portion 10a having an outer dimension approximately equal to the inner diameter dimension of the glass storage member 11.
and a lead wire portion 10b led out from the center of one end surface of the disc-shaped portion 10a.

When each of the above components is assembled, a sectional view as shown in FIG. 3(b) is obtained.

With the electronic component having the above configuration, even if an electrostrictive phenomenon occurs in the nonlinear dielectric element 7, the vibration caused by this phenomenon will be absorbed by the elastic members 9 and attenuated.

Therefore, damage caused by electrostrictive phenomena can be prevented.

Furthermore, non-linear dielectric element 7 and glass storage member■↓
Since it is spaced apart from the glass storage member 11, generated vibrations and generated heat are not directly transmitted to the glass storage member 11.

Further, by using a Dumet terminal, a rapid heat dissipation effect can be obtained.

In the illustrated embodiment, the elastic member has a substantially U-shape as an example, but the elastic member may have a substantially U-shape as shown in FIGS. 4(a) to 4(C). In addition, in the same figure, the same reference numerals are given to the same parts as those described above, and the description thereof will be omitted.

The dielectric element device 12 shown in FIG.
The difference from the electronic parts shown in a) and (b) is that a coil spring 15.15 is used as the elastic member. Even when such coil springs 15, 1.5 are used as elastic members, the same effects as in the embodiments described above can be obtained.

Similarly, the elastic member 16 shown in FIG. 3B is made of silver, copper, etc. and formed into a chevron shape, and the elastic member 17 shown in FIG. 2C is a thick plate. Even with each of these elastic members, it is possible to obtain the same effects as in each of the embodiments described above.

Furthermore, the glass storage member is not limited to a cylindrical shape, but may have a polygonal shape, an elliptical shape, or the like. Of course, in this case as well, the same effects as in the embodiment described above can be obtained.

[Effects of the Invention] According to the present invention described in detail above, it is possible to provide an electronic component that can ensure high heat resistance of the elements necessary for the starting circuit of a high-pressure sodium lamp and can be manufactured at low cost. .

[Brief explanation of drawings]

Fig. 1 is a structural sectional view showing one embodiment of the present invention, Fig. 2 is a circuit diagram used to measure the characteristics of the device of the above embodiment, and Figs. 3 (a) and (b) are other examples of the present invention. FIG. 4(a) to (C) are structural sectional views showing still other examples of the present invention. FIG. 5 is a circuit diagram of a high-pressure sodium lamp lighting circuit with a built-in starter. , 6th
The figure is a D-E hysteresis characteristic diagram of a nonlinear dielectric element.
FIG. 7 is a schematic cross-sectional view of a conventional nonlinear dielectric element. 1...Nonlinear dielectric element, 2...Dumet terminal, 3...Glass storage member. 2 (0) (b) (G) (b Fig. 23 JP-A-3-38814 (6) D (C/m2) Barge 1

Claims (3)

[Claims] (1) A nonlinear dielectric element with electrodes adhered to both sides,
A Dumet terminal conductively connected to the opposing surface of this element,
An electronic component comprising a part of the Dumet terminal and a cylindrical glass housing member housing the nonlinear dielectric element. (2) The electronic component according to claim 1, further comprising an electrically conductive elastic member electrically connected to one or both of the nonlinear dielectric element and the Dumet terminal. (3) The electronic component according to claim 1 or 2, wherein the lead wire portion of the Dumet terminal is plated with Ni or solder.