JPH084683Y2 - Light bulb with base - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a bulb with a base in which a hermetically sealed glass bulb is fixed and held on a front surface of an insulating base by a holding member, and the base and the glass bulb are integrated. In particular, the present invention relates to a light bulb with a base which is characterized by the shape of a welded portion between a lead wire on the closed glass bulb side and a contact on the base.

[Problems to be Solved by Prior Art and Invention]

Japanese Laid-Open Patent Publication No. 63-195948 discloses a light bulb with a base of this type, in which a pinch seal portion 2a of a closed glass bulb 2 is insulated by a metal holding member 6 as shown in FIGS. The structure is such that it is fixedly held on the front surface of the sex base 8. The filament 3 as a light emitting source is supported by a pair of lead wires 4 and 4 in the closed glass bulb 2, and the lead wires 4 and 4 are led out from the pinch seal portion 2a to the outside. On the front surface of the base 8, contacts 9b, 9b integrated with male terminals 9a, 9a in a male connector integrally formed at the rear end of the base are projected, and the lead wires 4, 4 are connected to these contacts 9b. , 9b are respectively spot-welded to secure the electrical connection between the contact and the lead wire.

However, since the contact 9b has a flat plate shape, it comes into contact with the lead wire 4 over the length indicated by reference numeral l in FIG.
Therefore, in spot welding, it takes time to raise the welding point to a high temperature, and there is a problem that reliable welding cannot be performed in a short time.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a light bulb with a base capable of performing reliable spot welding between a base contact and a sealed glass bulb side lead wire in a short time. To do.

[Means for solving the problem]

In order to achieve the above object, in a light bulb with a base according to the present invention, a base is formed by engaging and fixing an insulating base to a base engaging portion of an insulating connector portion, and a holding member fixed to the front surface of the base. The hermetically sealed glass bulb is fixed and held by the base engagement portion, and extends out forward from the base engaging portion and is led out from the pinch seal portion of the hermetically sealed glass bulb into a flat contact penetrating the base through the contact insertion hole. In a light bulb with a base in which lead wires are spot-welded, a strip-shaped convex portion that extends in a direction orthogonal to the extending direction of the lead wire and has a thickness equal to or less than the plate thickness of the contact and has a flat projecting end surface at the tip of the contact Is formed, and the lead wire is welded to the protruding flat end surface of the band-shaped convex portion.

[Action]

The contact point of the die side contact with the glass bulb side lead wire is the protruding flat end surface of the strip-shaped protrusion, and the contact area between the flat contact and the lead wire is larger than that in the case where the strip-shaped protrusion is not formed on the contact. It is small and the heat energy during welding tends to concentrate at that point. That is, the contact point between the contact and the lead wire can be brought to the welding-enabling temperature within a short time, and the time required for spot welding can be shortened.

Also, since the contact area between the lead wire and the contact is smaller, the compressive stress concentrates on the contact area, but the contact between the lead wire and the contact is a line contact with a larger contact area than the point contact. The compressive stress that acts on the contact portion between the wire and the contact is smaller than the compressive stress that acts on the point contact, and the lead wire is less likely to be crushed.

The thickness of the strip-shaped convex portion forming region of the contact to which the lead wire is welded is equal to or less than the plate thickness of the base portion of the flat plate-shaped contact, and does not prevent the contact from penetrating the contact insertion hole of the base.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of a light bulb with a base of the present invention. FIG. 1 is an exploded perspective view of the light bulb with a base, and FIG. 2 is a main part side contact and glass bulb side. FIG. 3 is an enlarged perspective view of a welded portion with a lead wire, and FIG. 3 is an enlarged horizontal sectional view of a welded portion with a contact and a lead wire.

In these drawings, reference numeral 10 is a closed glass bulb, which is fixed and held by a synthetic resin base 30 via a metal holding member 20.

The closed glass bulb 10 has a cylindrical shape with its tip closed in a spherical shape, and a pair of lead wires 12 and 12 extend inside, and a filament 14 as a light emitting source is stretched over the lead wires 12 and 12. There is. The lead wires 12, 12 are led out to the outside from the pinch seal portion 11 having a substantially rectangular cross section of the glass ball, and spot-welded to a pair of contacts 34, 34 projecting to the front surface of the base 30.

The holding member 20 has a structure in which a band region 24 around which the glass ball pinch seal portion 11 is wound is integrally formed on the front surface of the base region 22, and the base region 22 is supported by a support 37 on the mouthpiece side, and the holding member is formed. 20 is attached to the base 30 and integrated.

The mouthpiece 30 has a cylindrical male connector integrally formed at the rear end thereof, and a front surface of a connector portion 32 made of a synthetic resin having a side-shape L-shape with a pair of flat plate-shaped contacts 34, 34 protruding at the front end. In the structure, a disc-shaped synthetic resin base 36, which is a holding member support portion having four insert-molded supports 37 projecting to the front, is welded and integrated to a base engaging portion opening to the front. In the male connector of the connector part 32,
A pair of male terminals 3 integrated with the contacts 34, 34 respectively
3,33 are projected, and the power supply connector from the power supply is connected here. Reference numeral 35 is an O-ring for sealing the engaging portion between the connector portion 32 and the base 36.

The contacts 34, 34 on the base side project forward from the contact insertion holes 36a, 36a of the base 36, and the lead portions led out from the glass ball pinch seal portion 11 are provided at the tips of the contacts 34, 34.
12 and 12 are welded respectively. The contact 34 has a flat plate shape, but a ridge 38 extending in a direction orthogonal to the contact extending direction is formed at the welded portion with the lead wire 12.
That is, on the side of the contact 34 that comes into contact with the lead wire 12, concave regions 39a and 39b are formed before and after the welding portion is sandwiched, as shown in an enlarged view in FIGS. That is, the narrow upper end surface 38 of the ridge extending perpendicularly to the extending direction of the contact 34
The lead wire 12 is projection-welded at a. In the welded portion between the lead wire 12 and the contact 34, the contact length of the contact 34 with the lead wire 12 is limited to the width d of the ridge 38, so that energy is likely to be concentrated at the contact point, and therefore the contact is made. The point reaches the weldable temperature in a short time. Therefore, the time required for welding the lead wire and the contact can be shortened, and the welding strength at the welding point between the lead wire and the contact is also strong.

Further, the contact 34 is insert-molded with the tip side inserted into the molding die and integrated with the die 30,
Since the contact tip portion inserted into the molding die has a uniform thickness, there is no problem in insert molding. That is, as shown in FIG. 2, the contact 34 has projections and depressions formed at the tip thereof, but the projections and depressions are within the range of contact thickness (A ≧ B).
Therefore, the contact can be smoothly inserted and arranged in the molding die.

FIG. 4 is an enlarged perspective view of a welded portion between a contact on the base side and a lead wire on the glass bulb side, which is a main part of another embodiment of the present invention.

In the above-mentioned embodiment, the welding point region is formed by thinning the regions in which the welding point with the lead wire on the contact side is sandwiched forward and backward (reference numerals 39a, 39b). Due to this, the ridge portion 40 is formed in the welding point area.

[Effect of device]

As is apparent from the above description, according to the light bulb with a base according to the present invention, the contact point of the flat plate-shaped contact on the base side with the lead wire on the glass bulb side is a strip shape extending in a direction orthogonal to the extending direction of the lead wire. Since it is a convex portion, the contact area between the contact and the lead wire is small, the heat energy during welding is easily concentrated at the welding point, the welding time can be shortened, and the welding strength between the contact and the lead wire is also high, which is the durability It is also excellent.

In addition, since the weld between the lead wire and the contact is a line contact, the compressive stress that acts on the contact portion of the lead wire during welding is smaller than when the weld is a point contact, and the lead wire Is less likely to be crushed, which means it has better welding strength and durability.

Further, since the thickness of the contact tip portion where the band-shaped convex portion is formed is equal to or less than the plate thickness of the contact base portion, the contact can be smoothly inserted into the contact insertion hole of the base, and the contact with the base engagement portion of the base can be performed. Engagement (assembly of the base) can be performed quickly and easily.

Further, by making the contact insertion hole a size that substantially matches the plate thickness of the contact, it is possible to prevent dust and the like from entering the base engaging portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a light bulb with a base according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a welded portion between a contact on the base and a lead wire on the glass bulb, which is a main part thereof. Fig. 3 is an enlarged horizontal sectional view of the weld between the contact and the lead wire, No. 4
FIG. 5 is an enlarged perspective view of a welded portion between a contact and a lead wire, which is a main part of another embodiment of the present invention, FIG. 5 is a perspective view of a conventional light bulb with a base, and FIG. 6 is a base of the light bulb with a base. FIG. 6 is an enlarged perspective view of a welded portion between the side contact and the lead wire on the glass bulb side. 10 …… Closed glass bulb which is a light bulb, 11 …… Pinch seal part, 12 …… Lead wire, 30 …… Insulating base, 34 …… Contact, 38,40 …… Convex section, 39a, 39b …… Concave surface region.

Claims (1)

[Scope of utility model registration request] 1. An insulating base is engaged with and fixed to a base engaging portion of an insulating connector portion to form a mouthpiece, and a hermetically sealed glass bulb is fixed and held by a holding member fixed to the front surface of the base. In a light bulb with a base in which a lead wire extending from a joining portion to the front and extending from a pinch seal portion of a hermetically sealed glass ball to a flat plate-shaped contact penetrating through the contact insertion hole of the base and protruding to the front of the base is spot-welded, At the tip of the contact, there is formed a strip-shaped convex portion extending in the direction orthogonal to the lead wire extending direction and having a thickness equal to or less than the plate thickness of the contact and the projecting end surface of which is a flat surface. A light bulb with a base, wherein the lead wire is welded.