JPH11195403A - Lamp foot, small electric lamp having this lamp foot, and manufacture of small electric lamp using this lamp foot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly hold a filament with only a lead wire without using a bead glass untill the lead wire has been penetrated and supported, into a crash sealed-off part airtightly. SOLUTION: In a lamp foot composed of a filament 4 and a lead wire 3 mounted in an inside of a glass bulb 1 so that the lead wire 3 is supported and fixed by airtightly penetrating on a crash sealed-off part 2 of the glass bulb 1, in order to exactly hold the filament 4 untill the lead wire 3 has been supported and fixed to the crash sealed-off part 2, one piece of the led wire 3 is formed in such a constitution that a bypass part 7 for bypassing an exhaust tube 6 is provided, both sides of the bypass part 7 are extendedly arranged upward in parallel with each other through a bending part, and on upper part of the lead wire 3 is formed in a desired shape according to any kinds of the filament 4 to be installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount used for a small bulb such as a wedge base type, a small bulb having the mount, and a method of manufacturing a small bulb using the mount.

[0002]

2. Description of the Related Art A small-diameter ultra-small bulb used as a back light source for instrumentation of vehicles and the like is a wedge-base type (no base).
In general, a pair of lead wires supported by bead glass with a filament installed at the tip and inside a small-diameter glass bulb with one end closed and a crushed seal formed at the other end. It is formed by sealing.

[0003] Regarding the conventional method of manufacturing a small light bulb,
This will be described with reference to FIGS. As shown in FIG. 8, a pair of lead wires 10, 10 are inserted into an annular bead glass 9, and the bead glass 9 is heated and melted from the outside by a pair of sealing burners 11, 11 whose craters oppose each other. Lead wire 1
The bead glass 9 is fixed to 0 and 10. As shown in FIG. 9, a portion of the lead wires 10 and 10 located above the bead glass 9 is curved outward and the filament 4 is erected at the upper end, and a portion located below the bead glass 9 is a glass described later. The mounts are spaced apart within the inner diameter of the valve 1. As shown in FIG. 10, the mount is inserted into a small-diameter glass bulb 1 made of quartz glass, hard glass, or soft glass and closed at one end and open at the other end. Next, as shown in FIG. 11, at a position lower than the bead glass 9, the glass bulb 1 is crushed and sealed together with the exhaust pipe 6, and the exhaust gas in the glass bulb 1 is exhausted by the exhaust mechanism. Then, FIG.
As shown in the figure, a tip-off portion 8 is formed in the crushed sealing portion 2 at the mark where the exhaust pipe 6 is sealed off. The lead wire airtightly led out from the crushable sealing portion 2 is bent and attached to the outer surface of the crushable sealing portion 2 to receive the power receiving terminals 5 and 5.
Is composed.

[0004] In the small bulb thus obtained, the middle of the lead wires 10 and 10 is insulated and fixed by bead glass 9 in the glass bulb 1 so that the mechanical strength against vibration and the like is increased. .

[0005]

However, according to the conventional method of manufacturing a small light bulb in which the internal lead wire is supported and reinforced by bead glass, the function is unnecessary when the total length of the light bulb is shortened first. The space from the bead glass to the sealing part is wasted, and it is difficult to cope with the thinning of the backlight device. Second, the bead glass may be chipped in the glass bulb, and fragments may adhere to the filament. Third, there is a problem that the quality may be deteriorated, and thirdly, gas or the like is generated from the bead glass during lighting, which may adversely affect light emitted to the outside, resulting in a decrease in life characteristics. Was.

In order to solve such a problem, as disclosed in Japanese Patent Application Laid-Open No. 3-274657, a filament and a pair of lead wires are provided through the other end opening of a glass bulb having an exhaust pipe opened at one end. And the other end opening is crushed and sealed, and the glass pocket obtained by crushing is moved to the inside of the glass bulb, and is continuously provided inside the crushed sealing part. There has been proposed a small light bulb configured so that a lead wire is fixedly supported by a projected portion made of glass.

However, the small light bulb disclosed in Japanese Patent Application Laid-Open No. 3-274657 does not use bead glass,
The work of fixing the bead glass to the lead wire by heating and melting is omitted and the number of parts is reduced, so that there is an advantage that the workability can be improved and the cost can be reduced. However, there is a limit to shortening the overall length of the compact light bulb. Further, since the glass meat is sealed in the glass bulb, the performance of the bulb is adversely affected due to the breakage of the glass piece or the gas released from the lit glass as in the case of the small bulb described in the related art. May be caused.

The present invention has been made in order to cope with the circumstances of the above-mentioned prior art, and can reduce the overall length and weight without using a bead glass for supporting and fixing a lead wire. It is an object of the present invention to provide a mount used for a small light bulb which can be supplied at a low cost and which is highly reliable, a small light bulb having the mount, and a method of manufacturing a small light bulb using the mount.

[0009]

According to a first aspect of the present invention, a lead wire is provided so as to be supported and fixed by hermetically penetrating a crushed sealing portion of a glass bulb. A mount comprising a filament and a lead wire sealed in the glass bulb, and one mount for accurately holding the filament until the lead wire is supported and fixed to the crushable sealing portion. Lead wire,
A detour portion for detouring the exhaust pipe is provided, and both sides of the detour portion extend upward in a substantially parallel manner via a bent portion, and the upper portion of the lead wire has a desired shape according to the type of the filament to be bridged. It is characterized by being formed in.

According to a second aspect of the present invention, the end of the glass bulb is crushed and sealed, and a pair of lead wires are hermetically sealed through the crushed sealing portion. In a small-sized light bulb having a filament installed between the inner ends of the wire, a bead glass for supporting these leads is not attached to the inner lead.

According to a third aspect of the present invention, a single lead wire is provided with a bypass portion for bypassing the exhaust pipe substantially at the center, and both ends are upwardly directed substantially in parallel via a bent portion. The mount is formed by arranging a filament at both ends of the lead wire, forming a mount, closing one end, and positioning the mount so as to be located below the other end opening of the glass bulb having the other end opened. After the exhaust pipe is inserted and disposed, the opening of the glass bulb is crushed and sealed together with the exhaust pipe to hermetically seal the lead wire, and then the detour portion located below the crushed sealing portion Is cut to form a power receiving terminal.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

The embodiment shown in FIGS. 1 to 5 will be described. In a small light bulb, a crush seal portion 2 is formed at an end of a glass bulb 1 made of transparent quartz glass, hard glass or soft glass, and a pair of internal lead wires 3, 3 are supported by the crush seal portion 2. Have been. The inner lead wires 3, 3 are outwardly curved, and a filament 4 is provided between both ends. A pair of lead wires air-tightly drawn out from the crushing sealing portion 2 is bent and attached to the outer surface of the crushing sealing portion 2 to form the power receiving terminals 5 and 5.

Next, a method of manufacturing the small light bulb shown in FIG. 5 will be described. As shown in FIG. 1, one lead wire 3 is formed in a U-shape so that two sides have a substantially parallel positional relationship, and approximately the center of one side connecting the two substantially parallel sides will be described later. A bypass part 7 that can bypass the exhaust pipe 6 is provided. The upper part of the two substantially parallel sides of the lead wire 3 is formed so that the upper end is outward and the middle position is curved inwardly in an arc shape, and the filament 4 is provided between both ends of the lead wire 3. Configure the mount. As shown in FIG. 2, the mount is inserted through the other end of a glass bulb 1 made of quartz, hard glass, or soft glass having one end closed and the other end opened. The mount is inserted and arranged so that the bypass part 7 is located below the other end opening of the glass bulb 1. The exhaust pipe 6 is made of glass and has both ends opened. Exhaust pipe 6
Are arranged such that the upper end thereof is located slightly below the upper curved portion of the lead wire 3. The portion to be sealed is heated by a sealing burner (not shown), and the other end opening of the softened glass bulb 1 is pressed by a pincher jaw.
As shown in FIG. 3, a crush sealing portion 2 is formed. Next, FIG.
As shown in (2), the external lead wire 3 located below the crush sealing portion 2 is cut in a horizontal direction at a predetermined position so that only a substantially parallel portion remains. Then, after exhausting the impure gas in the glass bulb 1 through an exhaust pipe 6 provided with an exhaust mechanism (not shown), the exhaust pipe 6 is sealed and cut off, and as shown in FIG. A chip-off portion 8 is formed at a lower portion. The lead wire located below the crushable sealing part 2 is bent and attached to the outer surface of the crushable sealing part 2 to form the power receiving terminals 5 and 5.

In this embodiment, the filament 3 is provided with two parallel sides by one lead 3 until the lead 3 is supported by the crush-sealing portion 2, and the filament extends over both ends of the two sides. 4 is formed in a shape that can be held accurately, so that a bead glass fusing operation process for fixing the lead wire is not required, and the manufacturing process is simplified.

The embodiment shown in FIGS. 6 and 7 will be described. For simplicity of description, in the drawings, parts having the same functions as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted. The glass bulb 1 accommodates lead wires 3 supported by a crushable sealing portion 2 and filaments 4 connected to the lead wires 3. The lead wires 3 are formed in the glass bulb 1 so as to extend in the axial direction of the glass bulb 1 from the crushed sealing portion 2, bend inward at an intermediate portion, and have a vertically parallel positional relationship. I have. Both ends of the filament 4 formed in a coil shape are connected to the lead wires 3, 3 with the coil axis coinciding with the central axis of the glass bulb 1.

A method for manufacturing the small light bulb shown in FIG. 6 will be described. As shown in FIG. 7, one lead wire 3 is bent, and two substantially parallel sides and a piece connecting the two sides are provided with a detour for bypassing the exhaust pipe as in FIG. 1 described above. A bent portion is formed so as to be stepped from each other at a middle position of the two sides, and both ends are inwardly directed inward so that a tip portion of the bent portion is parallel to each other. A filament 4 is connected between both end portions of 3 to form a mount. Subsequent steps are the same as the steps shown in FIGS. That is, the mount is inserted into the glass bulb 1, the opening of the glass bulb 1 is crushed and sealed, and the side connecting the two sides of the lead wire 3 is cut such that the two parallel sides remain. After exhausting the impurity gas in the glass bulb 1, the exhaust pipe is sealed off to form the chip-off portion 8.
The lead wire that has been airtightly penetrated through the crushable sealing portion 2 and led out is bent and attached to the front and rear side surfaces of the crushable sealing portion 2 to form the power receiving terminals 5 and 5.

[0018]

As described above, according to the present invention, the lead wire constituting the mount is formed by bending one lead wire into a desired shape, and the lead wire led out after sealing is cut. As a result, the filament can be stably held until it is sealed in the glass bulb, and the bead glass fusing operation step is not required as in the prior art, and the workability is improved, and the obtained filament is obtained. There is an effect that the cost of a compact light bulb can be reduced.

Further, since the bead glass is not sealed in the glass bulb, there is no adverse effect of the bead glass such as deficiency of the bead glass or gas emission, and the performance is improved and the bulb is reduced in weight. .

Further, the total length of the small light bulb can be reduced, and as a result, the thickness of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mount according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state where a mount and an exhaust pipe are inserted into a glass bulb.

FIG. 3 is an explanatory view showing a state in which a glass bulb is crushed and sealed.

FIG. 4 is an explanatory diagram showing a state in which a lead wire is cut.

FIG. 5 is a view showing a small light bulb of the present invention.

FIG. 6 is a diagram showing a small light bulb according to an embodiment of the present invention.

FIG. 7 is a view showing the mount of FIG. 6;

FIG. 8 is a diagram showing a work of fusing bead glass to a lead wire in a conventional example.

FIG. 9 is a view showing a conventional mount.

FIG. 10 is a view showing a state where a mount and an exhaust pipe are inserted into a glass bulb of a conventional example.

FIG. 11 is an explanatory view showing a crushed sealing state of a conventional example.

FIG. 12 is a conventional small light bulb.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass bulb 2 Crush sealing part 3 Lead wire 4 Filament 5 Power receiving terminal 6 Exhaust pipe 7 Detour part

Claims (3)

[Claims] 1. A mount comprising a filament and a lead wire sealed in a glass bulb so that the lead wire passes through a crushed sealing portion of the glass bulb in a gas-tight manner and is fixedly supported. In order to be able to hold the filament accurately until the lead wire is supported and fixed to the crush seal portion, one lead wire is provided with a detour portion for detouring the exhaust pipe, and both sides of the detour portion are provided on both sides. A mount extending upward in a substantially parallel manner through a bent portion, and an upper portion of the lead wire is formed in a desired shape according to a type of a filament to be bridged. 2. An end portion of a glass bulb is crushed and sealed, and a pair of lead wires are hermetically sealed through the crushed sealing portion, and a filament is provided between inner ends of these lead wires. A small light bulb, wherein a bead glass for supporting these lead wires is not attached to the internal lead wire. 3. A detour part for detouring an exhaust pipe is provided at substantially the center of one lead wire, and both ends are extended substantially parallel upward through a bent part, and both ends of this lead wire are provided. A mount is formed by laying a filament, and the mount is arranged such that the detour is located below the other end opening of the glass bulb in a glass bulb having one end closed and the other end opened. After inserting and arranging the exhaust pipe, the opening of the glass bulb is crushed and sealed together with the exhaust pipe to hermetically seal the lead wire, and then the bypass part located below the crushed sealing part is sealed. A method for manufacturing a small light bulb, wherein a power receiving terminal is formed by cutting a lead wire including the lead wire.