JPH09153349A - Small lamps and lighting equipment - Google Patents

Abstract

It is an object of the present invention to provide a small light bulb or a small discharge lamp which has a high withstand voltage and can be further downsized by using a bead mount. A bead mount (2) in which an electrode (5) is provided on a pair of lead wires (4, 4) hermetically welded to a glass bead (3).
Of the bead mount 2 in which the lead wires 4, 4 extending from the glass bead 3 are narrower on the inner side 4A, 4A than on the outer side 4B, 4B. And a lighting device S using the small lamp L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small light bulb and a small discharge lamp having a bead mount, and a lighting device using these lamps.

[0002]

2. Description of the Related Art Small incandescent lamps or discharge lamps used for displays and illuminations in AV equipment, vehicles, etc., have a pair of lead wires without using a flare stem or the like because of price and small bulb diameter. A lamp is obtained by hermetically embedding it in a glass bead, laying a filament between the lead wires, and directly sealing a bead mount provided with a discharge electrode to a glass bulb. Recently, due to the miniaturization of devices, the lamps such as light bulbs used in these devices are required to be further downsized.

A conventional light bulb L using this type of bead mount, for example, comprises a glass bulb 1 and a bead mount 2 sealed to the glass bulb 1 as shown in FIG. The bead mount 2 has a pair of lead wires 4 and 4 fixed to the glass bead 3 by airtight welding, and a filament 5 is installed between the ends of the lead wires 4 and 4. The bead mount 2 has inner sides 4A, 4A and outer sides 4B, 4B extending from the glass beads 3.
The intervals LI and LO between the lead wires 4 and 4 were substantially the same on the inner and outer surface portions of the glass bead 3.

In the light bulb L having the above-mentioned structure, if the distance between the lead wires 4 and 4 is too close, there is a risk of discharge and a short circuit, for example, when the rated voltage is about 6.0 V, although it depends on the voltage specifications. A separation distance of about 1.5 mm or more is required, usually voltage, filament 5 length, bulb 1
Designed considering the diameter.

For example, rated voltage 6.0V, current 0.2A
In the case of the light bulb L, the outer diameter of the glass bulb 1 is about 5.25.
mm, the inner diameter BD is about 4.75 mm, the maximum major diameter of the glass beads 3 forming the bead mount 2 is about 3.7 mm, the distances LI, LO between the lead wires 4 and 4 are about 1.7 mm, and the inside of the bulb 1 is The gap T between the glass bead 3 and the maximum major axis portion is about 0.5 mm.

Further, the sealing work between the bead mount and the glass bulb is carried out by the method described in, for example, JP-A-57-196473.

[0007]

Therefore, in order to reduce the size of the light bulb L, for example, there is a problem in pressure resistance if the respective parts of the bulb 1 and the bead mount 2 are simply reduced as they are.

The present invention has been made in view of the above-mentioned circumstances, and has a high withstand voltage using a bead mount, which can improve the manufacturing yield and can further reduce the size of a small light bulb or a small discharge. The purpose is to provide a lamp.

[0009]

According to a first aspect of the present invention, there is provided a small lamp in which a glass bulb is sealed with a bead mount having electrodes on a pair of lead wires hermetically welded to a glass bead. The gap between the lead wires of the bead mount extending from the glass bead is narrower on the inner side than on the outer side.

By narrowing the gap between the lead wires on the inner side, the inclination of the mount is small at the time of sealing and it is possible to prevent the mount from contacting or approaching the inner wall of the valve. Also,
If the mount can be arranged at the center of the valve, the valve diameter can be reduced.

The small lamp according to claim 2 of the present invention comprises:
A glass coating portion is formed on the extending portion of the lead wire extending inward from the glass bead of the bead mount.

Since the glass coating is formed on the surface of the lead wire extending in the inner direction, the creepage distance between the two lead wires is increased, which is electrically safe.

The small lamp according to claim 3 of the present invention comprises:
It is characterized in that the glass coating portion of the extending portion of the lead wire extending in the inner direction is formed by melting the glass beads.

The glass of the bead melted at the time of manufacturing the bead mount can be formed by covering the extending portion of the lead wire, and it is not necessary to prepare a separate glass winding material.

The small lamp according to claim 4 of the present invention is
It is characterized in that the electrodes are filaments that emit light.

The lamp is an incandescent light bulb having a filament.

The small lamp according to claim 5 of the present invention comprises:
The electrode is a discharge electrode made of a conductor.

The lamp is a discharge lamp having a discharge electrode.

An illumination device according to a sixth aspect of the present invention is provided with the small lamp according to any one of the first to fifth aspects, a holder for the lamp and the lamp. It is characterized by having a light control body.

Since the miniaturized lamp according to any one of claims 1 to 5 can be mounted,
The device can be downsized.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional front view showing a small light bulb L. In FIG. 1, 1 is a glass bulb made of cylindrical soda-lime glass or lead glass with one end closed, and 2 is sealed at the end of the bulb 1. It is a bead mount. This mount 2 is a glass bead 3 made of the same material as the bulb 1.
Lead wires 4 and 4 made of a nickel-plated material are embedded and fixed in an airtight manner on the surfaces of a pair of dumet wires, and a coiled filament 5 around which a tungsten wire is wound is installed at the inner end. . Further, the inner side 4A located inside the bulb 1 is narrower than the outer side 4B located outside the bulb 1 and the lead wires 4 and 4 extending from the glass bead 3 are narrower than the outer side 4B. Inner side 4
A glass coating portion 7 is formed on the extended portion of A. Further, the inside of the glass bulb 1 is evacuated to be in a vacuum state or filled with an inert gas such as argon (Ar) at a predetermined pressure. Moreover, 8 is a sealing part.

For example, in the case of a light bulb L having a rated voltage of 6.0 V and a current of 0.2 A, the glass bulb 1 has an outer diameter of about 5.05 mm, an inner diameter BD of about 4.55 mm, and a glass forming the bead mount 2. The maximum major axis of the bead 3 is about 3.2.
mm, distance L between inner side 4A, 4A of lead wires 4, 4
I is about 1.3 mm, the distance LO between the outer sides 4B and 4B is about 1.7 mm (about the same size as the conventional one), and the glass coating portion extends over about 0.5 mm of the root portion of the inner side 4A extension portion. 7 is formed, and the gap T between the inside of the bulb 1 and the maximum major axis portion of the glass bead 3 is about 0.65 mm.

The light bulb L having such a structure has the inner side 4A, 4A of the lead wires 4, 4 extending from the glass bead 3.
The interval LI is about 1.3 mm, which is about 0.4 mm compared to the conventional one.
By making it smaller, the diameter of valve 1 is about 0.25m.
The size of the bulb L can be reduced, that is, the appearance of the light bulb L can be reduced by about 8% in volume as compared with the conventional same rated product. Further, by forming the glass coating portion 6 on the surface of the inner side 4A to increase the creepage distance, both lead wires 4, 4
The pressure resistance between them could be increased. Further, the distance LO between the outer sides 4B, 4B of the lead wires 4, 4 is equal to the valve 1
There is no problem in terms of pressure resistance because it is separated from the conventional product by about the same distance.

Further, by setting the gap T between the inner side of the bulb 1 and the maximum major axis portion of the glass bead 3 to be about 0.65 mm, the exhaust time in the bulb 1 can be shortened or the degree of vacuum can be improved and the emission characteristics can be improved. The yield was improved in the sealing process as well.

The manufacturing procedure of the above-described light bulb L according to the present invention is basically the same as the conventional technique. That is, a cylindrical glass bulb 1 having one end closed and the other end open, and a bead mount 2 in which a filament 5 is installed between a pair of lead wires 4 and 4 hermetically welded to a bead glass 3 are prepared. . This bead mount 2 is manufactured by bending a pair of lead wires 4 and 4 into a substantially C-shape or by bending the middle portion and embedding and fixing the lead wires 4 and 4 in the glass bead 3 (at this time, the intervals between the outer sides 4B and 4B of the lead wires 4 and 4). (LO is almost the same size as the conventional one.) At the same time, when the glass beads 3 are melted, a part of the glass is wetted up to the root of the extending portion of the inner side 4A by utilizing the capillary phenomenon to form the glass coating portion 7. is there. Conventionally, the glass cover portion 7 has not been positively formed on the inner side 4A of the lead wire 4.

Then, the opening of the glass bulb 1 is supported with its upper side facing upward, and the mount 2 is inserted through the opening,
The filament 5 is brought into contact with the inner surface of the top of the bulb 1. Next, while the valve 1 is rotated, the sealing target portion is heated by a burner to form an annular reduced diameter portion having a diameter smaller than the bead glass diameter of the bead mount 2 in the circumferential direction of the sealing target portion.

After that, the glass bulb 1 is inverted 180 degrees so that the top side is on the upper side and the end on the opening side is airtightly connected to the exhaust head of the exhaust system. At this time, the glass bulb 1 is turned over so that the mount 2 becomes the bulb 1.
However, the bead mount 3 is positioned in the bulb 1 by the bead glass 3 contacting the annular reduced diameter portion. At this time, the bead glass 3 having a reduced diameter
Is located near the center and has little inclination.

In this state, the inside of the bulb 1 is evacuated while the top side of the glass bulb 1 is supported by the holding member, and the bulb 1 is filled with an inert gas as necessary. Then, the portion to be sealed, that is, the reduced diameter portion of the glass bulb 1 is heated and melted by a burner, and the reduced diameter portion glass and the bead glass 3 of the mount 2 are welded to form a sealed portion. Then, the holding member is used to pull up the bulb 1 below the sealing portion, or to cut and remove the lower portion of the sealing portion with a cutter or the like to obtain the small light bulb L.

The small light bulb L has the lead wires 4,
The outer side 4A, 4A of 4 is directly connected to a wiring board or the like, or a cap is provided at the end of the valve 1 to be mounted in a socket for use.

FIG. 2 is a side sectional view of an essential part showing an embodiment of an illuminating device S as a display device D such as a meter using the small light bulb L. In the figure, S1 is a housing, S2 is a wiring board, and S is a wiring board.
3, S3, ... are sockets attached to this S2, L,
L, ... Are the small light bulbs mounted in the sockets S3, S3 ,.
S5, ... Are partition walls. This illuminating device S can turn on each of the small light bulbs L, L, ... In response to a signal, and emit light from the display plate portion S4 to the outside to notify the situation.

The small light bulb L has a small mount inclination at the time of sealing, and the number of defective products in which the filament comes into contact with or comes close to the inner wall of the bulb is reduced and the yield can be improved. Further, by narrowing both inner sides of the lead wire, the length of the valve becomes longer, but it is also possible to reduce the diameter, and it is possible to reduce the volume in volume by reducing the diameter. If the light bulb L can be downsized, the illumination device S using this light bulb L can also be downsized.

According to an experiment conducted by the present inventor, the small lamp according to the present invention has a bulb outer diameter of 3.0 to 5.5 m.
m, the inner diameter of the bulb is 2.5 to 5.0 mm, the maximum outer diameter of the bead mount glass bead is 2.0 to 4.5 mm, and the interval LI between the lead wires of the portion extending from the glass bead in the inner direction is 1 1 to 1.5 mm, the interval LO between the lead wires in the portion extending from the glass bead in the outer direction is 1.
It can be applied to a lamp having a distance T between the inner wall of the bulb and the maximum outer diameter portion of the glass bead of 5 mm or more within a range of 0.5 to 0.9 mm.

The present invention is not limited to the above embodiment. For example, in the example, a small light bulb was explained,
Not only the light bulb, but also the lead wires 4A and 4A extending in the bulb 1 as shown in FIG. 3 or a separate conductor such as nickel (Ni) on the lead wires 4A and 4A, and the cold cathode discharge electrode 6, It may be a cold cathode discharge lamp LD such as a neon lamp or a glow lamp in which 6 is formed, or a hot cathode discharge lamp in which a filament similar to a light bulb is installed as a discharge electrode between the lead wires 4A and 4A.

That is, in the case of the light bulb L, the filament 5 is used as a light emitting source, but in the case of the discharge lamp LD, the lead wires 4A and 4A extending in the bulb 1 are used as the discharge electrodes 6 and 6, or the leads are formed. For example, the wire 4A may be provided with a separate electrode, and in the present invention, these filaments, discharge electrodes or lead wires are collectively referred to as electrodes.
Further, the glass coating portion of the extended portion of the lead wire extending in the inner direction from the glass bead of the mount is not limited to one formed by melting the glass bead, but may be formed by separately winding glass. Good.

The lead wire fixed to the glass bead is not limited to the one described in the embodiment, and the inner part, the buried part and the outer part may be made of different materials, but the inner part is made of glass. Those that are well wetted with are preferred.

Further, the glass bulb is not limited to the one-end sealed type lamp, and the hot cathode discharge lamp or the like may be a both-end sealed type lamp, and the bulb shape is not limited to the straight tube type but is a U-shaped type. A bent lamp having a W shape or an L shape may be used.

Further, the illuminating device of the present invention is not limited to a display device but may be used for general illumination. When using a discharge lamp, it can be widely applied as an illuminating device for OA equipment. Furthermore, the members constituting the lighting device are not limited to those described in the embodiments, and the housing, the wiring board, the socket, the display plate portion, and the like may not necessarily be arranged, and conversely, the reflection plate and the light diffusion plate. It may be a device provided with.

[0038]

As described in detail above, according to the structure of the first aspect of the present invention, the number of defective products is reduced and the yield can be improved. Further, the diameter of the valve can be reduced, and by reducing the diameter, it is possible to reduce the volume by about 8% as compared with the conventional product of the same rating, and to reduce the volume. Further, claim 2 of the present invention
According to the configuration described in (1), since the distance between the lead wires is increased, an abnormal discharge due to the approach of the lead wires does not occur and the lead wires are not short-circuited. Therefore, it is possible to prevent the occurrence of a short life.

According to the third aspect of the present invention, glass can be wound around the extending portion of the lead wire at the same time when the bead mount is manufactured, and workability can be improved.

According to the fourth aspect of the present invention, it is possible to provide a smaller incandescent light bulb.

According to the fifth aspect of the present invention, it is possible to provide a smaller discharge lamp.

Further, according to the configuration of claim 7 of the present invention, a downsized lamp can be mounted, so that a downsized device can be provided.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a small light bulb of the present invention.

FIG. 2 is a front view showing an embodiment of the small discharge lamp of the present invention.

FIG. 3 is a side sectional view of an essential part showing an embodiment of a lighting device of the present invention.

FIG. 4 is a partial cross-sectional front view showing a conventional example of a small light bulb.

[Explanation of symbols]

 L: Small light bulb LD: Small discharge lamp 1: Glass bulb 2: Bead mount 3: Glass bead 4: Lead wire 4A: Inner side lead wire 4B: Outer side lead wire 5: Filament (electrode) 6: Discharge electrode ( Electrode) 7: Glass coating part S: Lighting device

Claims (6)

[Claims] 1. A bead mount, which comprises electrodes provided on a pair of lead wires hermetically welded to a glass bead, is sealed to a glass bulb, and a gap between the lead wires in a portion extending from the glass bead of the bead mount. A small lamp characterized in that the inner side is narrower than the outer side. 2. The small lamp according to claim 1, wherein a glass coating portion is formed on an extending portion of the lead wire extending inward from the glass bead of the bead mount. 3. The small lamp according to claim 2, wherein the glass coating portion of the extending portion of the lead wire extending in the inner direction is formed by melting a glass bead. 4. The miniature lamp according to claim 1, wherein the electrode is a filament that emits light. 5. The small lamp according to claim 1, wherein the electrode is a discharge electrode made of a conductor. 6. A small lamp according to any one of claims 1 to 5, a holding body for the lamp, and a light control body provided so as to face the lamp. Lighting equipment.