JPH0622919Y2 - Discharge tube with polarity display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a discharge tube in which a polar display portion is formed in an envelope made of a sealed glass tube bulb, and in particular, the devitrification phenomenon of glass is considered. The present invention relates to a technology that makes it extremely easy to recognize the polarity.

[Conventional technology]

For bulb elements that are operated by a DC power source, such as neon lamps or other discharge tubes, a polar mark is used to indicate whether the lead wire led to the outside of the bulb is the anode or cathode. It is known to give.

FIG. 2 shows a conventional discharge tube 1 of this type. The discharge tube 1 is an airtight envelope 2 made of glass.
A pair of electrodes 3a and 3b are arranged inside each other, and the electrodes 3a and 3b are supported at predetermined positions by lead wires 5a and 5b fixed at the sealing portion 4 of the envelope 2 at their intermediate portions. Has been done.

A polarity display mark 6 is attached to the surface of the sealing portion 4 corresponding to one of the lead wires 5a by an oil-based ink or a paint, and the polarity display mark 6 allows the lead wire 5a to the anode or the cathode. It can be identified from the outside, which is convenient for board mounting or socket mounting.

[Problems to be Solved by the Invention] However, as described above, in the case where the polarity indicating mark 6 is provided by the oil-based ink, when the discharge tube is mounted on the substrate, the cleaning step for removing flux shown in FIG. As described above, the polarity display mark 6 may be chipped, or in extreme cases, the polarity display mark 6 itself may disappear.
It can be difficult to identify the polarity.

In addition, since the formation of the polarity display mark 6 with a paint or the like requires a drying process for a certain time after application, not only the number of processes and working time are increased but also a new drying mechanism is required, resulting in high cost. There are drawbacks.

An object of the present invention is to realize a discharge tube which is not likely to disappear and whose polarity can be identified very easily.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a glass tube, which has a plurality of lead wires, corresponding to at least one lead wire, by forming a glass tube by irradiating a peroxygen burner flame. A discharge tube with a polarity display is formed by forming a white polarity display portion by crystallizing in a spot shape.

[Action]

According to the above, since the polarity display portion has a white color due to the crystallization of glass, there is no fear of disappearance, and it is possible to realize a discharge tube in which polarity identification is extremely easy.

〔Example〕

FIG. 1 is a view showing a discharge tube which is an embodiment of the present invention.

As shown in FIG. 1, in the discharge tube 1 of the present embodiment, a pair of electrodes 3a and 3b are arranged in opposition to each other in an airtight envelope 2 made of glass, and the electrodes 3a and 3b are respectively placed in the middle thereof. Lead wires 5a, 5 whose parts are fixed by the sealing portion 4 of the airtight envelope 2
The airtight envelope 2 is supported at a predetermined position by b, and a discharge gas such as neon gas is enclosed in the airtight envelope 2. A characteristic point of this embodiment is that a white polarity display portion 6 is formed on one surface of the sealing portion 4 of the airtight envelope 2 which is processed into a flat shape, and when viewed from the outside, the polarity is The recognition of the display unit 6 is extremely easy.

The procedure for forming the polarity display portion 6 of the discharge tube 1 will be described below.

First, a glass tube for constructing the envelope 2 is prepared, and the lead wires 5a, 5b and electrodes 3a, 3b formed in series with each other are inserted from one end thereof, and the electrodes 3a, 3b are enclosed by the envelope. 2 Place it in a predetermined position in the inner space. Next, the envelope 2
The sealing portion 4 is formed on one end side of the. The sealing portion 4 is formed, for example, by sandwiching one end of the glass tube in a semi-molten state with a jig or the like and crushing the one end side of the glass tube.

The polarity display portion 6 is a peroxygen burner flame in which a combustion gas, air and oxygen are mixed and burned on a surface of the sealing portion 4 in which one of the lead wires 5a is embedded. Are spot-irradiated to crystallize a part of the glass constituting the sealing part 4 from an amorphous state so that the glass surface is partially devitrified into a white color, which is used as the polarity display part 6. Is.

In the peroxygen burner flame used above, it is necessary to increase the ratio of oxygen to be mixed so that a high temperature flame can be obtained. The temperature of the flame may be set to a value at which the glass forming the envelope 2 is in a devitrified state. For example, when lead glass is used, about 1000 ° C. is appropriate.

Various types of city gas, liquefied petroleum gas, coal gas, natural gas, or the like can be used as the combustion gas used in the above-mentioned embodiment. The high temperature flame can be obtained by mixing a large amount of oxygen with these combustion gases. Further, as the glass material forming the envelope 2, any material may be used as long as it causes white crystallization in a high temperature state, and soda glass or the like can be used in addition to the lead glass described above.

[Effect of device]

According to the present invention, since the white portion of the glass constituting the bulb is crystallized is used as the polarity display portion, the polarity display portion of the discharge tube has no risk of disappearing due to washing or the like,
In addition, the polarity can be identified very easily.

[Brief description of drawings]

FIG. 1 is a view showing a discharge tube with a polarity display according to an embodiment of the present invention, and FIG. 2 is a view showing a discharge tube having a polarity display in the prior art. 1 ... Discharge tube, 2 ... Airtight envelope, 3a, 3b ... Electrode, 4 ... Sealing part, 5a, 5b ... Lead wire, 6 ... Polarity display part.

Claims (1)

[Scope of utility model registration request] 1. A glass tube forming a plurality of lead wires is crystallized into spots by irradiation of a peroxygen burner flame on a portion of the glass tube corresponding to at least one lead wire. A discharge tube with a polarity display that has a white polarity display section.