JPH08315785A - Small light bulb device - Google Patents

Abstract

(57) [Abstract] [Purpose] By connecting an adapter consisting of a heat-resistant, elastic, and insulative member between the small light bulb 2 and the base 12, the vibration resistance is improved and the desired optical center distance is achieved. The purpose is to respond to. [Structure] A small light bulb 2 in which lead wires 4 and 4 are led out from a rear end of a glass bulb 1, an insertion portion 9 is continuously provided at a rear end, and an insertion opening 10 and a lead wire insertion hole 11 communicating therewith are provided inside. And an adapter 7 provided on the base portion, a flange 14 on the base portion, an insertion opening 10 on the inside, and a base 12 having a lead wire insertion hole 16 communicating with the insertion opening 10.
4 is formed so as to pass through the lead wire insertion holes 11 and 16 and be led out from the rear end of the base 12.

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 device suitable for mounting on a printed circuit board, and more particularly to a measuring instrument for vehicles, such as automobiles and trains, which require vibration resistance and impact resistance. The present invention relates to a small light bulb device used as a back light source.

[0002]

2. Description of the Related Art Heretofore, a commonly used compact light bulb device of this type will be described with reference to FIGS.

In FIGS. 3 and 4, the small light bulb device is composed of a combination of a small light bulb 2 and a base 12. Of these, the small light bulb 2 comprises a glass bulb 1, a filament 6, an anchor 5, a bead glass 3, and a lead wire 4. One end of the glass bulb 1 is sealed in a substantially dome shape, and the other end is sealed with a bead glass 3 to be hermetically sealed, and the inside thereof is filled with an inert gas or the like. The lead wires 4 and 4 are fixed to the bead glass 3 at predetermined intervals, and the outer ends of the lead wires 4 and 4 are airtightly led out from the bead glass 3 so that they can be electrically connected to an external power source (not shown). Has been formed. Inside the bead glass 3, two anchors 5 and 5 are fixedly erected at predetermined intervals so as to be located inside the lead wires 4 and 4. The filament 6 connected between the inner ends of the lead wires 4 and 4 is stretched by the anchors 5 and 5.
The base 12 is made of an insulating member, and is integrally formed with a flange 14 protruding outward from the rear end of the tubular portion 13. An insertion opening 15 is provided inside the tubular portion 13, and lead wire insertion holes 16 are formed in the insertion opening 15 along the front-rear direction. For the request for the center distance of the light, the base 1
A new one that corresponds to the length of the tubular portion 13 of 2,
A small light bulb device including only the small light bulb 2 and the base 12 has been obtained.

Then, as shown in FIG. 4, the lead wires 4 and 4 of the small light bulb 2 are inserted into the lead wire insertion holes 16 and 16, respectively, and the small light bulb 2 is inserted and attached to the insertion hole 15 to form a small light bulb device. The lead wires 4 and 4 assembled and manufactured and led out from the lead wire insertion holes 16 and 16 are used by being electrically connected to an electrode portion such as a printed circuit board (not shown).

Further, as disclosed in Japanese Utility Model Publication No. 5-9812 and Japanese Utility Model Publication No. 5-12922, a halogen lamp having a structure in which a metal band or the like is provided around a sealing portion to hold a light bulb in a base is disclosed. Proposed.

[0006]

Since the small light bulb device of the conventional example has a structure in which the small light bulb is inserted into the base,
The impact force applied must be completely absorbed by the small light bulb and the base, and even if the small light bulb and the base are loosely fitted, they are extremely vulnerable to shock and vibration. Therefore, there is a problem in that the cost is high and it is uneconomical because it has to be manufactured individually corresponding to.

In the halogen lamp disclosed in Japanese Utility Model Publication No. 5-9812 or Japanese Utility Model Publication No. 5-12922, since a metallic lamp is interposed between the light bulb and the base, it is not elastic and absorbs vibration and shock. However, there was a problem that the vibration resistance was extremely low.

Therefore, in order to eliminate the problems of the conventional example, the present invention provides elasticity between the small light bulb and the base.
An object of the present invention is to provide a small light bulb device that is excellent in vibration resistance and can extremely easily position the light center of a small light bulb by providing an adapter having heat resistance and insulation.

[0009]

In order to achieve the above object, the present invention provides a small light bulb in which a filament is enclosed and a lead wire is airtightly drawn from one end to the outside, and is inserted into a rear end portion of an adapter body. Parts are connected, the front end face of the adapter body is opened and an insertion port is bored to a midway position in the axial direction of the adapter, and a lead wire is opened to the bottom face of the insertion port and the rear end face of the insertion part, respectively. An adapter provided through the insertion hole, an insertion opening for inserting the insertion portion of the adapter inside, and a base outer end edge of the tubular portion provided through the lead wire insertion hole communicating with the insertion opening. It is composed of a base provided with a flange, and the lead wire is inserted through the lead wire insertion hole, and the insertion portion of the adapter is inserted into the insertion opening of the base so that the lead wire is led out from the rear end of the base. The mouth said It is formed by inserting a type bulb.

Further, it is preferable that the adapter is made of an elastic, insulating and heat resistant member.

[0011]

By engaging the insertion portion of the adapter with the insertion portion of another adapter, various optical center distance requirements can be met.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a glass bulb of a small light bulb 2, one end of which is sealed with a dome shape and the other end of which is sealed with a bead glass 3 so as to be hermetically sealed, and an inert gas is sealed therein. The inner ends of the lead wires 4 and 4 are opposed to each other inside the glass bulb 1 along the axial direction of the glass bulb 1, and the outer ends of the lead wires 4 penetrate the sealing portion of the bead glass 3 in an airtight manner and are led out to the outside. Has been done. The anchors 5 and 5 are fixedly erected on the bead glass 3 at positions inside the lead wires 4 and 4. The filament 6 connected between the inner ends of the lead wires 4 and 4 is stretched by anchors 5 and 5. Adapter 7
Is composed of an elastic, heat-resistant and insulating member, and is composed of an adapter body 8 and an insertion portion 9 which is continuously provided under the adapter body 8. An insertion opening 10 is opened on the front end surface of the adapter body 8. The insertion port 10 is bored to a midway position in the axial direction of the adapter body 8. The insertion opening 10 is formed to have a size such that the rear end portion of the glass bulb 1 or the insertion portion 10 can be inserted. The lead wire insertion hole 11 is provided so as to penetrate in the front-rear direction from the rear end surface of the insertion opening 10. The base 12 is formed by connecting a tubular portion 13 and a flange 14 protruding from an outer edge of a base portion of the tubular portion 13 in a continuous manner. An insertion opening 15 for inserting the insertion portion 9 of the adapter 7 is provided inside the cylindrical portion 13. The lead wire insertion hole 16 is provided so as to penetrate in the front-rear direction from the rear end surface of the insertion port 15.

The insertion port 15 of the base 12 has an adapter 7
The insertion portion 9 of the adapter 7 is inserted and engaged, the rear end portion of the glass bulb 1 is inserted into the insertion opening 10 of the adapter 7, and the lead wire 4 of the small light bulb 2 is inserted into the lead wire insertion holes 11 and 16 and the cap is inserted. It is led out from the rear end of 12.

Assembling is performed by inserting and inserting the insertion portions 9 of the plurality of adapters 7 into the insertion opening 10 corresponding to the light center distance of the small light bulb 2, and the glass bulb 1 is inserted into the insertion opening 10 of the adapter 7 located at the front. The rear end is formed by inserting the insertion portions 9 of the adapter 7 located at the end into the insertion ports 15, respectively.

The lead wire 4 led out from the rear end of the base 12 is used, for example, by being electrically connected to an electrode portion of a printed circuit board (not shown).

[0017]

INDUSTRIAL APPLICABILITY The present invention provides elasticity, heat resistance, and
Since the adapter made of an insulating member is provided between the small light bulb and the base, there is an effect that it is possible to provide a small light bulb device that absorbs vibration and has high vibration resistance.

Further, by attaching a single or a plurality of adapters assembled in the axial direction as needed, between the small light bulb and the base, there is an effect that the position of the light center can be easily determined.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a small light bulb, an adapter and a base in one embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a small light bulb and a base in a conventional example.

FIG. 4 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 2 Small light bulb 4 Lead wire 6 Filament 7 Adapter 8 Adapter body 9 Insertion part 10, 15 Insertion port 11, 16 Lead wire insertion hole 12 Base 13 Tube part 14 Flange

Claims (2)

[Claims] 1. A small light bulb 2 in which a filament 6 is enclosed inside and lead wires 4 and 4 are airtightly drawn from one end to the outside.
And an insertion portion 9 is provided at the rear end portion of the adapter body 8 and the front end surface of the adapter body 8 is opened so that the adapter 7
The axial direction of the adapter 7 in which the insertion port 10 is bored up to an intermediate position in the axial direction of The insertion port 10 is bored up to the middle position, and the insertion port 10
An adapter 7 having lead wire insertion holes 11 and 11 penetrating the bottom surface of the insertion part 9 and the rear end surface of the insertion part 9, respectively, an insertion opening 15 inside, and a lead wire insertion hole 16 communicating with the insertion opening 15. The base 12 of the cylindrical portion 13 penetrating through the base 16 is provided with a flange 14 at the outer edge thereof, and the lead wires 4 and 4 are inserted through the lead wire insertion holes 11 and 16, respectively. The insertion portion 9 is inserted into the insertion opening 15 so that the insertion portion 9 is guided to the outside from the rear end of the insertion opening 10.
A small light bulb device, characterized in that the small light bulb 2 is formed by being inserted thereinto. 2. The adapter 7 according to claim 1 is elastic,
2. An insulating and heat resistant member.
The small light bulb device described.