JP2523114Y2 - light bulb - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to a light bulb having a structure in which a leg of a filament coil and a lead wire are connected.

(Prior Art) Conventionally, an incandescent lamp in which a connection structure between a supporter and a filament coil is specified is disclosed in Japanese Patent Laid-Open No.
It is called "conventional example." ).

This incandescent lamp will be described with reference to FIGS. In the figure, a sealing portion 2 in which a molybdenum foil 3 is sealed at one end of a bulb 1 is formed. Inside the bulb 1, an internal lead wire 5 fixed with a glass piece 6 is provided.
Is connected to the filament coil 7. An external lead wire 4 is also connected to the molybdenum foil 3.

Further, the swaging portion 8a formed on the supporter 8 supports an intermediate portion of the filament coil 7.

Here, as shown in the drawing, the connection structure between the filament coil 7 and the internal lead wire 5 includes a single coil portion 7b formed at the end of the filament coil 7 via a thread foot 7a. It is inserted and connected to the tip 5a of the lead wire 5.

(Problem to be Solved by the Invention) However, in the connection structure of the filament coil 7 and the internal lead wire 5, the single coil portion of the filament coil 7 is attached to the tip 5 a of the internal lead wire 5 extending in the axial direction of the bulb 1. Since 7b is inserted, the internal lead wire 5
The tip 5a, into which the single coil is inserted, must be separately formed, and the total length of the internal lead wire 5 cannot be shortened.

Therefore, it is difficult to reduce the size of the bulb 1, so that the size of the bulb cannot be reduced.

Further, in the case where the single coil portion 7b is inserted into the internal lead wire 5 for connection, for example, the wire diameter of the internal lead wire 5 must be changed for each filament coil 7 having different power consumption. . That is, in general, the inner diameter of the single coil portion 7b of the filament coil 7 differs depending on the power consumption. Heavy coil part 7b
It must be adjusted to the inside diameter of

Therefore, since the internal lead wires 5 must be prepared for each power consumption, the cost cannot be reduced by so-called common use of components.

Furthermore, since the yarn foot 7a does not have the coil shape of the filament coil 7 and is the filament coil 7 itself, it lacks rigidity, supports the filament coil 7 in an unstable manner, and easily vibrates. It is.

In order to improve the vibration resistance of the filament coil 7, the caulking portion 8a formed on the supporter 8 merely supports the intermediate portion of the filament coil 7, and the caulking portion 8a and the filament coil 7 Are not making good electrical connections and do not have strong mechanical strength.

Accordingly, the supporting structure of the caulking portion 8a of the supporter 8 and the filament coil 7 shown in FIG. 6 merely discloses that the filament coil 7 is supported, and the internal lead wire 5 and the filament coil 7 are not supported. The above-mentioned problems in the connection structure with the coil 7 are neither disclosed nor suggested.

Then, in this invention, in order to solve the said subject, it aims at providing the electric bulb which clamped the leg part of the filament coil with the lead wire.

[Structure of the Invention] (Means for Solving the Problems) A light bulb of the present invention includes a bulb, a filament coil disposed in the bulb and having a leg formed of a single coil at an end portion, The leg portion has a bent portion having a wire diameter (d) larger than the distance between adjacent windings (1) and holding the leg portion, and the bent portion has a bent portion (a distance between the opposed wires). L) is formed smaller than the outer diameter (D) of the filament coil, and has a lead wire that enters between the windings and engages with the leg.

(Operation) In the present invention, the lead wire has a wire diameter larger than the distance between the adjacent windings at the leg portion of the filament coil, and this portion forms a bent portion for clamping the leg portion.
The bent portion is formed such that the distance between the bent and opposed lines is smaller than the outer diameter of the filament coil.

Therefore, the bent portion of the lead wire enters and engages between the windings of the leg portions, and the lead wire and the filament coil are connected.

(Embodiment) Hereinafter, a bulb showing one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, a single sealed halogen bulb as a light bulb has a filament coil 2 housed in a bulb 1 made of quartz glass, hard glass or the like.

The filament coil 2 is disposed substantially in the center of the bulb 1 along the axial direction.
It is connected to the.

The pair of lead wires 3, 3 is supported in the middle by a bridge glass 4, and the ends are inserted into a crush sealing portion 5 formed at the end of the bulb 1. A pair of Mo (molybdenum) foils 6, 6 are sealed to the crushed sealing portion 5, and ends of the lead wires 3, 3 are connected to the Mo foils 6, 6, respectively. External lead wires 7, 7 are connected to these Mo foils 6, 6, respectively.

The filament coil 2 is formed by winding a tungsten wire doubly to form a double coil, and has leg portions 8 and 8 formed at both ends thereof as a single coil.

The filament coil 2 is deformed by sagging (sag)
In order to prevent this, tension is applied in the coil axis direction, and both end legs 8, 8 of such a filament coil 2 are mechanically supported by the lead wires 3, 3 and are electrically connected. ing.

In this case, bent portions 9, 9 (hook portions) formed by bending the lead wires 3, 3 are formed at the distal end portions of the lead wires 3, 3, and the leg portions of the filament coil 2 are formed by these bent portions 9, 9.
Holds 8,8.

The lead wires 3, 3 are made of tungsten W, which has little reactivity with the enclosed halogen, and have bent portions 9, 9 (hook portions) formed by bending them at the tip.

The bent portions 9, 9 are provided so as to be substantially perpendicular to the legs 8, 8 of the filament coil 2, and are formed by bending a tungsten wire having a circular cross section into a substantially U-shape without any processing. I have. In this case, the wire diameter d of the lead wires 3 is larger than the distance 1 between adjacent windings of the single coil forming the leg portion 8 (d ≧ 1). In addition, bending part 9,
In No. 9, the distance L between the opposing wires is smaller than the coil diameter D (L <D).

Finally, the lead wires 3 are connected to the filament coil 2
The legs 8, 8 have a wire diameter larger than the distance between adjacent windings, and the bent portions 9, 9 which clamp the legs 8, 8 at this portion.
Since there is no need to separately provide a portion into which the legs 8, 8 are inserted, the total length of the lead wires 3, 3 can be reduced, and the size of the bulb can be reduced.

In addition, bent portions 9,9 are formed on the lead wires 3,3 to form leg portions 8,8.
, So that it can be connected to the filament coil 2 without changing the wire diameter of the lead wires 3, 3.
The cost can be reduced by using the lead wires 3 and 3 in common.

The distance between the windings which are bent and opposed to each other is formed to be smaller than the outer diameter of the filament coil 2.

Therefore, since the bent portions 9, 9 formed in the lead wires 3, 3 bite between the adjacent windings in the leg portion 8 of the filament coil 2 and engage with the leg portion 8, tension in the coil axis direction is reduced. The leg portions 8, 8 of the given filament coil 2 do not come off from the bent portions 9, 9 of the lead wires 3, 3, so that the vibration resistance of the filament coil 2 is improved and the reliability of mechanical coupling is high. .

In addition, the bent portions 9 and 9 are connected to the leg portions 8 of the filament coil 2.
In this case, since the wire is cut between adjacent windings and is in contact with the leg portion 8, a predetermined contact area can be secured, and the current is satisfactorily conducted.

Since the bent portions 9, 9 formed on the lead wires 3, 3 do not need to be crushed or cut, there is no need to consider workability, and there is no risk of reacting with halogen sealed in the bulb. Dangsten W can be used, lead wire 3,3
The life of the gas becomes longer, and the purity of the halogen gas does not need to be used in the conventional manner.

Further, since the filament coil 2 is not particularly deformed by being crushed, it is difficult to break the wire.

Furthermore, since the bent portions 9 and 9 do not have a flat surface, there is no fear that the edge hits the filament coil 2 and cutting is prevented.

The present invention is not limited to the above embodiment, and may be an incandescent lamp other than a halogen lamp.

[Effect of the Invention] In the present invention, the lead wire has a wire diameter larger than the distance between adjacent windings in the leg portion of the filament coil, and this portion forms a bent portion for clamping the leg portion. Therefore, there is no need to separately provide a portion into which a leg is inserted, and the total length of the lead wire can be shortened, and the size of the light bulb can be reduced.

In addition, since the lead wire has a structure in which the bent portion is formed and the leg is sandwiched, it can be connected to the filament coil without changing the wire diameter of the lead wire. Can be planned.

The bent portion is formed such that the distance between the windings bent and opposed is smaller than the outer diameter of the filament coil. Therefore, since the bent portion of the lead wire enters and engages between the windings of the leg portions, strong mechanical strength can be obtained and the vibration resistance of the filament coil can be improved. Can be secured to a predetermined size, and the electrical connection is improved.

[Brief description of the drawings]

FIG. 1 is a front view of a light bulb showing one embodiment of the present invention. FIG. 2 is a plan view showing an engagement portion between a bent portion of a lead wire and a leg portion of a filament coil. FIG. 3 is a sectional view taken along the line II-II in FIG. FIG. 4 is a partial longitudinal sectional view of an incandescent lamp showing a conventional example. FIG. 5 is an enlarged view of a main part showing a supporting structure of a caulking portion of an internal lead wire and an intermediate portion of a filament coil in an incandescent lamp showing a conventional example. FIG. 6 is a sectional view of a main part showing a supporting structure of a caulking portion of an internal lead wire and an intermediate portion of a filament coil in an incandescent lamp showing a conventional example. 1 ... valve, 2 ... filament coil, 3 ... lead wire,
8 ... Legs, 9 ... Bends.

Claims (1)

(57) [Scope of request for utility model registration] A valve; a filament coil disposed in the valve and having a leg formed of a single coil at an end; and a distance between adjacent windings (1) in the leg. A bent portion having a wire diameter (d) for holding the leg portion is formed, and the bent portion is formed such that the distance (L) between the bent and opposed lines is smaller than the outer diameter (D) of the filament coil. And a lead wire which is inserted between the windings and engages with the leg portion.