JPH047561Y2 - - Google Patents

Description

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

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem that the invention attempts to solve E. Means for solving the problem F. Example a Valve [Figures 1 to 3] b Mouth part [Figure 3] 1 to 4] b-1 Holding band [Fig. 1 to 3] b-2 Base body [Fig. 1 to 4] b-3 Metal sleeve [Fig. 1 to 4] b -4 Terminal [Fig. 1] b-5 Connecting line [Fig. 1] c Attaching the holding band to the metal sleeve 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, light bulbs used as light sources for headlights, such as automotive lighting equipment, and especially,
This invention relates to a light bulb with a base, in which a bulb containing a filament is held in a base having a base body made of synthetic resin and a metal sleeve fixed to the tip of the base body, and the metal sleeve is inexpensive. It can be formed into Ensure that current does not flow through the valve support member connecting the valve and the metal sleeve, which may cause burns to the valve support member or damage the part of the valve to which the valve support member is connected. The purpose of the present invention is to provide a novel light bulb with a base that is not exposed to high heat.

(B. Summary of the invention) The present invention is a light bulb with a base, in which a bulb is held in a base having a base body and a metal sleeve, and the metal sleeve has a cracked part along the central axis direction. By contacting the two circumferential edge portions facing each other across the cracked portion with a conductive plate that electrically conducts the two, a portion where high frequencies are concentrated on the metal sleeve is eliminated. A valve support that connects the valve and the metal sleeve when joining the external lead wire led out from the valve and the terminal attached to the base body or the connecting wire connected to the terminal. Electric current flows through the member, causing burns to the valve support member,
Alternatively, the portion of the valve to which the valve support member is coupled is prevented from being exposed 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 that is designed to fit well with the reflector to which the base light bulb is attached and to have 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 in order to prevent problems such as mounting the valve on it and dissipating heat. There is something I did.

When a metal sleeve is formed by drawing, it requires an expensive material suitable for drawing, and there is a problem in that the manufacturing cost becomes high due to inefficient material extraction.

Therefore, it is conceivable to form a metal sleeve by winding and bending a metal plate into a cylindrical shape, and to form a crack along the central axis direction in order to facilitate fitting to the base body.

(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 bulb. The problem is that it flows towards the valve support member, resulting in a so-called burnt state of the valve support member. 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 holds the bulb in a base having a base body made of synthetic resin and a metal sleeve, and A light bulb with a base in which a sleeve is formed with a crack along the central axis direction, and a conductive plate is provided on two peripheral edges of the metal sleeve that are opposed to each other through the crack, and electrically conducts the two. is in contact with the

Therefore, regarding the light bulb with a base according to the present invention,
Since the metal sleeve has no part in its circumferential direction where the current is interrupted, there are places where high frequencies are concentrated when connecting external lead wires and terminals within the space defined by the metal sleeve. Since no current flows through the bulb support member, this prevents the member from burning, and furthermore, prevents the lamp with a base from being affected by heat to the part of the bulb to which the member is connected and from discoloration of the member. It is possible to prevent deterioration of the appearance of the product.

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

In the embodiment shown in the drawings, the light bulb with a base of the present invention is applied to a halogen light bulb 1 with a base used as a light source for an automobile headlamp.

(a Bulb) [Figures 1 to 3] 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 Mouth Portion) [Figs. 1 to 4] Reference numeral 11 denotes a mouthpiece portion 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) [Figures 1 to 3] Reference numeral 12 denotes 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 of a spring elastic material. It is formed by press-forming a single sheet metal material having a

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 smaller than the inner diameter of the 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) [Figures 1 to 4] Reference numeral 18 denotes a base body, which is molded from a thermoplastic synthetic resin.

The cap body 18 has a substantially cylindrical shape, and the inside thereof is divided into a valve holding part 20 and a connector part 21 by a partition wall 19 provided in the middle part. Terminal mounting holes 22, 2 are provided in the partition wall 19.
2 and 22 are formed. In addition, the base body 18
There is a flange 2 projecting outward on the outer peripheral surface of the
3 is integrally formed, and the outer peripheral edge of the flange 23 has three positioning notches 24, 24, 2
4 (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.

Reference numeral 26 denotes a protrusion formed on the inner circumferential surface of the base body 18 along the central axis direction, and is for positioning the metal sleeve.

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

(b-3 Metal sleeve) [Figures 1 to 4] 27 is a metal sleeve.

The metal sleeve 27 has an outer diameter that allows it to fit inside the valve holding portion 20 of the mouthpiece body 18 .

28 is a crack formed along the central axis direction of the metal sleeve 27. By engaging the split portion 28 with the protrusion 26 formed on the inner circumferential surface of the cap body 18, positioning between the metal sleeve 27 and the cap body 18 in the circumferential direction is achieved.

Reference numeral 29 denotes a conductive plate that is brought into contact across the two opposing peripheral edges 30a, 30b of the metal sleeve 27 through the crack 28 in order to establish electrical continuity between them. 31, 31,…
... is a band attachment piece provided so as to protrude forward from the front edge of the metal sleeve 27,
These band attachment pieces 31, 31, . . . have their front ends 32, 32, . ,17,...
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 27 in this embodiment is slightly shorter than the length of the valve holding portion 20 of the base body 18. In addition, band mounting pieces 31, 3
The front end portions 32, 32, . . . of 1, .

The metal sleeve 27 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 27 are heated. The material resin of the cap body is melted between the two, thereby fixing the metal sleeve 27 to the valve holding portion 20 of the cap body 18.

(b-4 Terminal) [Fig. 1] Reference numerals 33, 33, and 33 are terminals disposed within the connector portion 21 of the base body 18. Each terminal 3
3 has a mounting piece 34 bent at right angles to the main part at its base end, and a cylindrical part 35 protruding toward the opposite side of the main part is formed on the mounting piece 34.
Therefore, the mounting pieces 34 of the terminals 33, 33, 33,
The cylindrical portions 35, 35, 35 formed in the cylindrical portions 34, 34 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. , 35 protruding toward the valve holding portion 20 side, and thereby the terminals 33, 33, 33 are disposed within the connector portion 21 of the base body 18.

(b-5 Connecting line) [Figure 1] 36, 36, 36 are connecting lines, and the rear end portions are connected to the cylindrical portions 35, 35, 35 of the terminals 33, 33, 33,
35 is inserted into the mounting pieces 34, 34, 34.
The front end thereof is located near the open end of the metal sleeve 27.

(c. Attaching the holding band to the metal sleeve) Therefore, the holding band 12 is attached to the metal sleeve 27 in the following manner while holding the valve 2.

That is, the band attachment piece 31 of the metal sleeve 27,
31, . . . are inserted into the holes 17, 17, . . . of the holding band 12.
2, 32, ... 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 31, 31, . . .
The front ends 32, 32, . . . and the protruding pieces 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 cap body 18 via the holding band 12 and the metal sleeve 27.

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 6, 36, and 36. In this case, it is preferable to perform soldering using high frequency induction heating.

(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, and in which an external lead wire and a terminal or a connecting wire connected to the terminal are joined in a space defined by the metal sleeve. , the metal sleeve includes:
A crack is formed along the direction of the central axis, and a conductive plate is brought into contact with two end edges in the circumferential direction that face each other across the crack to electrically conduct the two. .

Therefore, according to the present invention, there is no place where high frequencies are concentrated when connecting the external lead wire and the terminal etc. in the space defined by the metal sleeve, and therefore, the connection between the valve and the metal sleeve is eliminated. Since no current flows through the parts that connect the parts, this prevents the parts from being burnt, and further prevents the parts of the bulb where the parts are connected from being adversely affected by heat or discoloration of the parts. It is possible to prevent deterioration of the appearance of the product.

[Brief explanation of drawings]

Figures 1 to 4 show an example of the implementation of the light bulb with base of the present invention. Figure 1 is a vertical side view, Figure 2 is a perspective view of the whole, Figure 3 is an exploded perspective view of the whole, and Figure 3 is an exploded perspective view of the whole. FIG. 4 is an enlarged sectional view taken along the - line in FIG. 1. Explanation of symbols, 1... Light bulb with base, 2... Bulb, 6... Lead wire, 8... Filament, 11
...Cap part, 18...Base body, 27...Metal sleeve, 28...Cracked part, 29...Conducting plate, 30
a...edge portion, 30b...edge portion, 36...connection line.

Claims (1)

[Claims for Utility Model Registration] A valve in which a filament is sealed is held in a cap part having a cap body made of synthetic resin and a metal sleeve fixed to the tip of the cap body, and the metal sleeve is A light bulb with a cap formed by joining an external lead wire and a terminal or a connecting wire connected to the terminal in a space defined by the above, wherein the metal sleeve has a crack along the central axis direction. What is claimed is: 1. A light bulb with a cap, characterized in that a conductive plate is brought into contact with two end edges in the circumferential direction that face each other across the cracked portion to electrically conduct the two.