JPH043393Y2 - - Google Patents

Description

[Detailed Description of the Invention] The light bulb with base of the present invention will be explained according to the following items.

A Industrial field of application B Overview of the invention C Prior art D Problem to be solved by the invention E Means for solving the problem F Example a Valve b Mouth portion b-1 Holding band b-2 Mouth body b -3 Metal sleeve b-4 Terminal b-5 Connection wire c Attachment of holding band to metal sleeve d Modification of metal sleeve d-1 First modification [Fig. 4] d-2 Second modification [ [Figure 5] G. Effects of the invention (A. Field of industrial application) The present invention relates to a novel light bulb with a base. Specifically, for example, a light bulb used as a light source for a headlamp, such as an automobile lamp, and in particular, a bulb containing a filament is fixed to a base body made of synthetic resin and a tip of the base body. This invention relates to a light bulb with a base that is held in a base having a metal sleeve, which allows the metal sleeve to be formed at a low cost, and also allows for an external lead wire led out from the bulb and a terminal provided on the base. Or, when joining the connection wire connected to the terminal, prevent current from flowing through the valve support member connecting the valve and the metal sleeve, thereby causing burnout to the valve support member. The object of the present invention is to provide a novel light bulb with a base, which prevents the part of the bulb to which the bulb support member is connected from being exposed to high heat.

(B Overview of the invention) The light bulb with a base of the present invention is a light bulb with a base in which a metal sleeve is interposed between the base body made of synthetic resin and the bulb, and the metal plate is wound into a cylindrical shape, and
By overlapping both edges in the circumferential direction and bending the edges in this state to form a metal sleeve, there is no part where high frequencies are concentrated on the metal sleeve, thereby making it possible to eliminate the part where high frequencies are guided out from the valve. When connecting the external lead wire and the terminal attached to the base body or the connecting wire connected to the terminal, current flows through the valve support member connecting the valve and the metal sleeve. This prevents the valve support member from being burnt or from subjecting the portion of the valve to which the valve support member is connected to high heat.

(C Prior Art) A light bulb with a base, for example, a light bulb with a base used in an automobile lamp, has a base part in consideration of conformity to the reflector to which the base light bulb is attached and good dimensional accuracy. There are some that use synthetic resin members. When a synthetic resin member is used, a cylindrical metal sleeve is attached to the synthetic resin mouthpiece body, and the valve is held through this metal sleeve, due to issues such as attaching the valve to it and dissipating heat. There is something I did.

When a cylindrical metal sleeve is formed by drawing, an expensive material suitable for drawing is required, and the manufacturing cost becomes high due to poor material extraction efficiency. There is.

Therefore, it is conceivable to form a metal sleeve by winding and bending a metal plate into a cylindrical shape.

(Problems to be solved by the D idea) Forming a metal sleeve by winding and bending a metal plate into a cylindrical shape has the advantage that the metal sleeve can be manufactured at low cost.

However, there are problems as described below.

That is, it is quite difficult to insert the tip of the external lead wire led out from the valve into the hole formed in the base of the terminal while passing through the long cylindrical part. Therefore, either a part of the terminal is extended close to the open end of the metal sleeve, or a connecting wire is provided that is connected to the terminal and one end extends close to the open end of the metal sleeve, and an external lead wire is soldered to these. It is possible to do so. In such a case, since it is structurally difficult to directly heat the connection between the external lead wire and the terminal or connection wire, high-frequency induction heating may be used.
Then, the high-frequency vibrations at that time concentrate on the circumferential edge of the metal sleeve (hereinafter referred to as the "peripheral edge"), and the resulting high-frequency current connects the metal sleeve and the valve. There is a problem in that the valve support member flows toward the valve support member, which is in a so-called burnt state. Furthermore, when current flows through this valve support member, it generates heat, so there is a problem that the portion of the bulb supported by the valve support member is exposed to high heat.

(E Means for Solving Problems) In order to solve the above-mentioned problems, the light bulb with a base of the present invention is a light bulb with a base in which the bulb is attached to the base body made of synthetic resin through a metal sleeve. hand,
A metal sleeve is formed by winding a metal plate, overlapping its peripheral edges, and bending the peripheral edges in this state.

Therefore, regarding the light bulb with a base according to the present invention,
Since there is no part in the circumferential direction of the metal sleeve where the current is interrupted, there is no place where high frequencies are concentrated when connecting the external lead wire of the valve and the terminal or the connecting wire connected to the terminal. ,
No current flows through the valve support member connecting the valve and the metal sleeve.

(F. Example) The details of the light bulb with base of the present invention will be explained below according to the illustrated example.

1 to 3 show a first embodiment in which the light bulb with a base of the present invention is applied to a halogen light bulb with a base.

(a Bulb) 2 is a bulb of the halogen light bulb 1. 3 is the rear end (in Fig. 1, the upward direction is defined as the front, and the downward direction is defined as the rear. In the following explanation, directions will be referred to in this direction.)
is a pinch seal part 4, and the front end is closed with an exhaust part 5 to form a hermetically sealed glass bulb.

6, 6, . . . are lead wires that pass through the pinch seal portion 4 and are held at intermediate portions by the pinch seal portion 4.

7, 7 are glass bridges, which are welded to sandwich the lead wires 6, 6, . . . from both sides within the glass bulb 3. Filaments 8, 8 are stretched between the tips of appropriate lead wires 6, 6, . . . .

The pinch seal portion 4 has a substantially flat shape, and has protrusions 9 on both sides in the width direction.
9, . . . are formed, and the cross-sectional shape is approximately I-shaped. Further, engagement protrusions 10, 10 are formed at positions near the lower end of both sides of the pinch seal portion 4.

Incidentally, the glass bulb 3 is filled with an inert gas and a suitable halogen.

The valve 2 is formed as described above.

(b Base part) 11 is a base part that holds the valve 2.
The cap portion 11 includes a holding band that holds the glass bulb 3 of the bulb 2 with the pinch seal portion 4, a cap body supported by a lamp body of a predetermined headlamp, and a cap body attached to the cap body, and the holding band and a metal sleeve to which it is fixed.

(b-1 Holding band) 12 is a holding band that holds the valve 2 by wrapping around the pinch seal portion 4 of the valve 2, and the holding band 12 is made by pressing a sheet metal material having spring elasticity. It is formed by molding.

Reference numeral 13 denotes a holding portion that is bent so as to form a substantially square shape as a whole when viewed from the front and rear directions.

Further, reference numerals 14 and 15 denote mounting portions having a substantially fan shape that extend from approximately the middle of the rear end edge of the holding portion 13 toward opposite sides and gradually widen toward the tip. The diameter of the circle circumscribing each tip edge of 14 and 15 is equal to or slightly smaller than the inner diameter of a metal sleeve, which will be described later. And the mounting part 14
and protruding pieces 16, 16, .
... is formed in a cut-and-raised shape. 17, 17,…
. . . are holes formed by cutting and raising the projecting pieces 16, 16, .

(b-2 Base Body) Reference numeral 18 denotes a base body, which is molded from thermoplastic synthetic resin.

The cap body 18 has a substantially cylindrical shape, and its interior is divided into a valve holding portion 20 and a connector portion 21 by a partition wall 19 provided in the middle. The partition wall 19 has terminal mounting holes 22,
22, 22 are formed. In addition, the base body 1
A flange 23 projecting outward is integrally formed on the outer peripheral surface of 8, and three positioning notches 24, 24,
24 (only two are shown in the drawing) are formed.

25 is an annular fitting groove formed on the outer peripheral surface of the base body 18 at a position forward of the flange 23;
An O-ring-shaped sealing material is fitted into the fitting groove 25 and contributes to waterproofing between the base body 18 and the lamp body when the light bulb is attached to the lamp body.

Note that a predetermined terminal is provided inside the cap body 18, which will be described later.

(b-3 Metal sleeve) 26 is a metal sleeve.

The metal sleeve 26 has an outer diameter that allows it to fit inside the valve holding portion 20 of the mouthpiece body 18 . The metal sleeve 26 is formed by winding and bending a metal plate into a cylindrical shape, and at both ends in the circumferential direction, that is,
The peripheral edges 27a and 27b are overlapped and bent in this state, whereby the peripheral edges 27a and 27b are completely connected.

28, 28, . . . are band attachment pieces provided so as to protrude forward from the front edge of the metal sleeve 26, and these band attachment pieces 28, 2
The front ends 29, 29, . . . of 8, . The rear part from the middle part is inclined so that each part is positioned correspondingly to the other part.

Note that the length of the metal sleeve 26 in this embodiment is slightly longer than the length of the valve holding portion 20 of the base body 18. In addition, band mounting pieces 28, 2
The front end portions 29, 29, . . . of 8, . . . are oriented parallel to the respective corresponding projections 16, 16, .

The metal sleeve 26 formed as described above is inserted into the valve holding part 20 of the base body 18 from its rear end, and high frequency induction heating is performed in this state, so that the inner wall surface of the valve holding part 20 and the outer peripheral surface of the metal sleeve 26 are heated. The material resin of the cap body is melted between the two, thereby fixing the metal sleeve 26 to the valve holding portion 20 of the cap body 18.

(b-4 Terminals) 30, 30, 30 are terminals disposed within the connector portion 21 of the base body 18. Each terminal 3
0 has a mounting piece 31 bent at right angles to the main part at the base end, and a cylindrical part 32 protruding toward the opposite side of the main part is formed on the mounting piece 31.
Therefore, the mounting pieces 31 of the terminals 30, 30, 30,
The cylindrical portions 32, 32, 32 formed in the cylindrical portions 31, 31 are inserted into the terminal mounting holes 22, 22, 22 formed in the partition wall 19 of the base body 18 from the connector portion 21 side. , 32 protruding toward the valve holding portion 20 side, and thereby the terminals 30, 30, 30 are disposed within the connector portion 21 of the base body 18.

(b-5 Connecting portion) 33, 33, 33 are connecting lines, and the rear end portions are connected to the cylindrical portions 32, 32, 32 of the terminals 30, 30, 30,
Attachment parts 31, 31, 31 in a state where it is inserted into 32
The front end thereof is located near the open end of the metal sleeve 26.

(c Attaching the holding band to the metal sleeve) Therefore, the holding band 12 is attached to the metal sleeve 26 in the following manner while holding the valve 2.

That is, the band attachment piece 28 of the metal sleeve 26,
28, . . . are inserted into the holes 17, 17, .
9, 29, ... relative to the holes 17, 17, ... to remove the filaments 8, 8 of the valve 2.
Adjust the positional relationship between the flange 23 of the base body 18 and the flange 23 of the base body 18 to be correct, and when the adjustment is made correctly, the band mounting pieces 28, 28, . . .
The front ends 29, 29, . . . and the protrusions 16, 16, . . . of the holding band 12 are fixed by plasma welding or the like.

As a result, the valve 2 is held on the base body 18 via the holding band 12 and the metal sleeve 26.

Then, the external lead wires 6, 6, 6 led out from the pinch seal portion 4 of the valve 2 are connected to the connecting wire 3.
Solder the front ends of 3, 33, .... In this case, it is preferable to perform soldering using high frequency induction heating.

(d Modified Examples of Metal Sleeve) Next, some modified examples of the metal sleeve will be listed.

(d-1 First Modification) [FIG. 4] FIG. 4 shows a first modification 26A of the metal sleeve.

This metal sleeve 26A has holes 34, 34, . . . formed at appropriate intervals in the circumferential direction.

In the case of the metal sleeve of the light bulb with base according to the present invention, the electrical resistance at the portion where the peripheral edges 27a and 27b are overlapped and connected is inevitably large.
The amount of heat generated in the circumferential direction of the metal sleeve tends to be uneven, but by forming the holes 34, 34, etc. here and there as described above, the cross-sectional area of these parts can be reduced, and this can be solved. Therefore, locations with a large amount of heat generation are distributed almost equally in the circumferential direction of the metal sleeve 26A, and the welding strength when welding the base body 18 and the metal sleeve 26A is made uniform in the circumferential direction of the metal sleeve. .

In addition, the melted portion of the cap body 18 is connected to the hole 3.
4, 34, . . . and has the effect of increasing the bonding strength between the base body 18 and the metal sleeve 26A.

(d-2 Second Modification) [FIG. 5] FIG. 5 shows a second modification 26B of the metal sleeve.

This metal sleeve 26B has slits 35, 35, . . . formed at appropriate intervals in the circumferential direction.

The presence of the slits 35, 35, . . . produces the same effect as the presence of the holes 34, 34, .

(Effects of the G Design) As is clear from the above description, the light bulb with a cap of the present invention consists of a bulb in which a filament is sealed, a cap body made of synthetic resin, and a metal cap fixed to the tip of the cap body. A light bulb with a base, which is held in a base having a sleeve,
A metal sleeve is formed by winding a metal plate into a cylindrical shape, overlapping both edges in the circumferential direction, and bending the edges in this state.

Therefore, regarding the light bulb with a base according to the present invention,
Since there is no part in the circumferential direction of the metal sleeve where the current is interrupted, there is no place where high frequencies are concentrated when connecting the external lead wire of the valve and the terminal or the connecting wire connected to the terminal. ,
No current flows through the valve support member connecting the valve and the metal sleeve.

[Brief explanation of the drawing]

1 to 3 show an example of the implementation of the light bulb with a cap of the present invention, in which FIG. 1 is a longitudinal sectional side view, FIG. 2 is a perspective view of the whole, and FIG. 3 is an exploded perspective view of the whole. FIG. 4 is a perspective view showing a modification of the metal sleeve, and FIG. 5 is a perspective view showing another modification of the metal sleeve. Explanation of symbols, 1... Light bulb with base, 2... Bulb, 11... Base part, 18... Base body, 26...
...metal sleeve, 27a...edge to be overlapped, 27b...edge to be overlapped, 26A...
Metal sleeve, 26B...Metal sleeve.

Claims (1)

[Scope of Claim for Utility Model Registration] A light bulb with a base, which comprises a bulb containing a filament and held in a base having a base body made of synthetic resin and a metal sleeve fixed to the tip of the base body. A light bulb with a base, characterized in that a metal sleeve is formed by winding and bending a metal plate into a cylindrical shape, overlapping both edges in the circumferential direction, and bending the edges in this state.