JPH0519259B2 - - 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. Field of industrial application B. Summary of the invention C. Background art [Figure 10] D. Problems to be solved by the invention [Figure 10] E. Means for solving the problems F. Examples [Figures 1 to 1] [Figure 9] a Glass bulb [Figures 1 to 3] b Holding plate [Figures 1 to 4] c Cap body [Figures 1 to 3, Figures 5 to 9] c-1 Outer shell part [Figures 1 to 3, Figures 5 to 7, Figure 9] c-2 Contact piece [Figures 1 to 3, Figures 5 to 7] c-3 Core [Figures 1 to 3, Figure 8,
[Fig. 9] c-4 Holding part [Figs. 1 to 3, Fig. 8] c-5 Connection between the outer shell and the core [Fig. 9] d Connection between the glass bulb and the cap body G Invention Effect A Field of Industrial Application The present invention relates to a novel light bulb with a base. Specifically, the cap body is composed of an outer shell part and a core part made of synthetic resin, the core part holds a glass bulb, and the core part and the outer shell part are joined by ultrasonic welding. An object of the present invention is to provide a novel light bulb with a base, which has good dimensional accuracy after the outer shell part and the core part are joined.

(B Summary of the Invention) The light bulb with a base of the present invention has a base body composed of an outer shell part and a core part made of synthetic resin, and the core part holding a glass bulb is fixed to the outer shell part by ultrasonic welding. The welded portions of the outer shell and core are inclined surfaces that are inclined in the same direction and at approximately the same angle, so that when ultrasonically welding the outer shell and the core, Since both inclined surfaces extend over each other, the outer shell portion and the core portion are joined to a predetermined depth, and the dimensional accuracy after joining of the outer shell portion and the core portion is improved.

(C Background Art) [Figure 10] When the cap body is made of synthetic resin and a glass bulb is held in it, the part that holds the glass bulb is formed separately from the other parts, and the two are later joined together. This will improve workability and also make it easier to produce a desired shape.

In that case, it is preferable that the part holding the glass bulb be joined to other parts by ultrasonic welding.

FIG. 10 shows a general structure in which the part holding the glass bulb and other parts are ultrasonically welded.

Reference numeral a denotes an outer shell made of thermoplastic synthetic resin, and an open recess b is formed at the front end of the outer shell. A step c facing forward is formed on the inner surface of the recess b in a portion close to the open end.

Reference numeral d designates a core portion that holds a glass bulb, and is formed with a cylindrical portion e that projects rearward, and this core portion d is also made of thermoplastic synthetic resin. The cylindrical portion e can be fitted into the recess b of the outer shell portion a.

Thus, the cylindrical part e of the core part d is fitted into the recess b of the outer shell part a, and the rear end surface f of the cylindrical part e is fitted into the step part c formed in the recess b of the outer shell part a. be brought into contact. Therefore, the step part c of the outer shell part a and the core part d
Ultrasonic vibration is applied to the rear end face f to melt the step part c and the rear end face f of the core part d, thereby joining them together.

(D Problems to be solved by the invention) [No. 10
Figure] When the outer shell part a and the core part d have the above structure, the molten resin melts between the stepped part c of the outer shell part a and the rear end surface of the cylindrical part e of the core part d, which are supposed to abut each other. There is no place for the molten resin g to escape, and the molten resin g is interposed between the step c and the rear end face f of the cylindrical part e, and the step c and the rear end face f of the cylindrical part e do not come into close contact with each other. There is a problem in that the core portion d protrudes forward from the intended position and dimensional accuracy is impaired.

Further, the amount of molten resin g interposed between the stepped portion c and the rear end surface of the cylindrical portion e varies depending on the product, and therefore dimensional accuracy becomes extremely unstable.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the light bulb with a base of the present invention has a base body made of synthetic resin holding a glass bulb in which a filament is sealed. The cap body is composed of an outer shell part and a core part holding a glass bulb, and the outer shell part has a recessed part that opens forward, and a part of the inner surface of the recessed part near the open end. A stepped portion facing forward is formed, and a portion toward the front from the stepped portion is an inclined surface that is displaced outward as it goes forward, and a cylindrical portion protruding backward is formed in the core portion. At the same time, the outer circumferential surface of the rear end of the cylindrical portion is formed into an inclined surface that is inclined at approximately the same angle in the same direction as the slanted surface of the outer shell as it goes rearward. The outer shell and the core are integrated by fitting into the front end of the recess of the outer shell and joining the inclined surfaces of the outer shell and the core by welding. It is something.

Therefore, in the light bulb with a cap of the present invention, there is no welding rib or the like interposed between the abutting surfaces of the outer shell portion and the core portion, and the inclined surfaces of the two are melted. Due to the melting, the sloped surfaces of each other cross over and the abutting surfaces of the two abut against each other, so the dimensional accuracy of the cap body depends only on the molding accuracy of the outer shell and core. Improves dimensional accuracy.

(Embodiment F) [Figs. 1 to 9] Details of the light bulb with base of the present invention will be described below according to the illustrated embodiment. In the illustrated embodiment, the present invention is applied to a halogen light bulb 1.

(a Glass bulb) [Figures 1 to 3] 2 is a glass bulb of the halogen light bulb 1, one end of which is closed with a substantially flat pinch seal part 3, and the other end of which is closed with an exhaust part 4, making it airtight. The inside is filled with an inert gas and a specified halogen.

5, 5 are lead wires, the middle part of which is held in the pinch seal part 3 so as to pass through it in the axial direction, and the part 5 inside the glass bulb 2
The portions a and 5a are internal lead wires, and the portions 5b and 5b led out from the pinch seal portion 3 are external lead wires. And internal lead wires 5a, 5
A filament 6 is stretched between the tips of a.

(b Holding plate) [Figures 1 to 4] 7 is a holding plate for holding the glass bulb 2 and connecting it to the base body described below,
It is made of a metal plate.

The holding plate 7 is formed by integrally forming a metal band 8 and connecting plates 9, 9 and 10.

The metal band 8 is the pinch seal part 3 of the glass bulb 2
It is bent so as to form a substantially rectangular shape when viewed from the front and back direction so as to be wrapped around the periphery of the holder, and connecting pieces 8a, 8a are formed at the abutting portions of both ends.

Then, the metal band 8 is wrapped around the pinch seal portion 3 of the glass bulb 2, and in this state, the connecting piece 8
a and 8a are joined together by spot welding or the like. In this way, the metal band 8 is attached to the pinch seal portion 3.
Fixed.

The connecting plates 9, 9, and 10 are all provided along the rear edge of the long side of the metal band 8, that is, the edge on the opposite side to the side where the glass bulb 2 is located.

The connecting plates 9, 9 are connecting pieces 8 of the metal band 8.
The other connecting plate 10 is formed to be continuous at a substantially right angle from the rear edge of the long side of the metal band 8 and the rear edge of the long side of the metal band 8. It is formed by being bent outward at a substantially right angle from the rear end edge of the long side opposite to the one long side 8a. Furthermore, skirt edges 9a, 9a, 10a are integrally formed from the outer peripheral edge of each of the connecting plates 9, 9, 10 and protrude rearward.

Then, one piece each on the connecting plates 9, 9,
Two insertion holes 11, 11, . . . are formed in the connecting plate 10 at intervals, and each insertion hole 1
The edges of the openings 1, 11, . . . are slightly raised toward the front and are formed into a short cylindrical shape.

(c Base body) [Figures 1 to 3, Figures 5 to 9] 12 is a base body, and the base body 12 is fitted and fixed to the outer shell and the front end of the outer shell. It consists of a core part.

(c-1 Outer shell part) [Figures 1 to 3, Figures 5 to 7, and Figure 9] 13 is an outer shell part, which is formed by molding a thermoplastic synthetic resin, and has a contact piece. is held integrally.

The outer shell portion 13 is composed of a main portion 14 having a substantially cylindrical shape and a connector portion 15 integrally projecting laterally from the rear end of the main portion 14. The connector portion 15 has a generally elliptical tube shape with a small size in the front and back direction, and has a recess 16 that opens laterally.

The main portion 14 is formed with a recess 17 that opens at the front end and reaches almost the rear end, and the front end of the recess 17 is formed into a large diameter portion 18 having an inner diameter larger than the other portion. Further, the main portion 14 has a rear end portion 19 that is slightly thicker than other portions. By forming the large diameter portion 18, a step portion 20 facing forward is formed, and a portion of the rear end of the large diameter portion 18 that is continuous with the step portion 20 is formed as it goes toward the rear. It is formed on an inclined surface 21 that is displaced inward.

A positioning protrusion 22 extending along the axial direction of the main portion 14 is integrally formed on the inner surface of the large diameter portion 18 .

Reference numeral 23 denotes a flange that projects laterally from the outer surface of the main portion 14 near the front end.

(c-2 Contact piece) [Figures 1 to 3,
5 to 7] 24 and 25 are contact pieces made of a conductive material.

Each of the contact pieces 24 and 25 has an L-shaped side surface, and the vicinity of the L-shaped bent portion is embedded in the rear end 19 of the main portion 14 of the base body 12. That is, the main part 14 and the connector piece 2
4 and 25 are integrally connected by so-called insert molding.

One end portions 24a, 25a of these contact pieces 24, 25 are connected to the recess 1 of the connector portion 15.
6 and serves as a connector piece.

Further, the portions 24b and 25b to which the other ends of the contact pieces 24 and 25 belong are located in the recess 17 of the main portion 14.
extend along its axial direction and have a concave portion 1 at their front end.
It is said to be a reed piece slightly protruding from the front end of 7.

The portions 24c and 25c embedded in the rear end portion 19 of the main portion 14 are bent into a substantially crank shape when viewed from the front. As a result, when viewed from the front, the lead pieces 24b and 25b are attached to the main portion 1.
4 and extending in the axial direction of the connector portion 15, and are arranged so as to be located on opposite sides of the line.

By arranging the lead pieces 24b, 25b in this manner, they can be arranged near the central axis of the main portion 14, and a relatively large distance can be maintained between them.

(c-3 Core part) [Figures 1 to 3, Figure 8,
FIG. 9] Reference numeral 26 denotes a core portion, which is formed by molding a thermoplastic synthetic resin.

The core portion 26 has a shape in which the front surface of a cylindrical portion 27 having a short axial length is closed by a front plate 28 .

An outer peripheral edge 28a of the front plate 28 slightly protrudes from the outer peripheral surface of the cylindrical portion 27.

The outer circumferential surface of the rear end of the cylindrical portion 27 is an inclined surface 29 that is displaced inward toward the rear, and the rear end surface 30 is a surface substantially perpendicular to the axis of the cylindrical portion 27. ing. The slope of the slope 29 is in the same direction as the slope 21 of the large diameter portion 18 of the outer shell portion 13 and has substantially the same slope angle.

A step portion 31 facing rearward is formed on the outer peripheral surface of the cylindrical portion 27 at a position slightly forward from the rear end.

Reference numeral 32 denotes a grooved portion formed on the outer peripheral surface of the cylindrical portion 27 along the axial direction.

Slits 33 and 34 are formed in the center of the front plate 28 of the core portion 26, and these slits 33 and 34 have a positional relationship corresponding to the positional relationship of the lead pieces 24b and 25b of the contact pieces 24 and 25. lead pieces 24b, 25b
This is the insertion part for inserting the. Further, the rear end opening edges 33a, 34a of the slits 33, 34 are widened in a chamfered manner to facilitate insertion of the lead pieces 24b, 25b.

35 is a partition formed integrally with the front plate 28, and the slits 33 and 34 on the front side of the front plate 28
It protrudes forward from a position between.

(c-4 Holding part) [Figures 1 to 3, Figure 8] 36, 36, ... are glass bulbs 2 attached to the cap body 12.
This is a support pin that serves as a holding part for holding the.

The bases of these support pins 36, 36, .
It is embedded in the front plate 28 of and protrudes forward from the front plate 28. These positions correspond to the positions of the insertion holes 11, 11, . . . formed in the holding plate 7.

(c-5 Connection of outer shell section and core section) [Fig. 9] Therefore, the core section 26 is connected to the main section 14 of the outer shell section 13.
The front end of the recess 17 formed in the large diameter portion 1
8. At this time, the protrusions 22 formed on the large diameter portion 18 engage with the grooved portions 32 formed on the core portion 26, so that the distance between the outer shell portion 13 and the core portion 26 in the circumferential direction is After positioning, the lead pieces 24b of the contact pieces 24, 25,
25b are inserted into the slits 33, 34 formed in the front plate 28 of the core part 26, and the lead pieces 24b,
The front end portion of 25b is made to protrude forward from the front plate 28 inside the support pins 36, 36, .

In this state, the outer shell part 13 and the core part 26 are integrally joined by ultrasonic welding to form the base body 12. At this time, the inclined surface 21 formed on the large diameter portion 18 of the outer shell portion 13 and the inclined surface 29 formed on the cylindrical portion 27 of the core portion 26 are brought into contact, and ultrasonic vibrations are applied to this contact surface. At the same time, the core portion 26 is pressed toward the outer shell portion 13. However,
The contact surfaces between the inclined surfaces 21 and 29 are melted, and accordingly, the cylindrical portion 27 of the core portion 26 is connected to the outer shell portion 1.
The cylindrical portion is gradually inserted into the large diameter portion 18 of No. 3, and finally, the cylindrical portion is inserted into the large diameter portion 18 of No. The insertion operation of 27 into the large diameter portion 18 is stopped, and the ultrasonic vibration applied to the contact surface is also stopped.

As described above, the outer shell portion 14 and the core portion 26 are integrated by ultrasonic welding.

In addition, 37 is the tip surface 14 of the main part 14 of the outer shell part 13.
This is a fitting groove formed to extend in an annular shape between the outer peripheral edge 28a of the front plate 28 of the core portion 26, and an O-ring-shaped packing 38, for example, is fitted into the fitting groove 37.

(d. Joining of the glass bulb and the cap body) The glass bulb 2 is coupled to the cap body 12 in the following manner.

That is, first, the support pins 36, 36, . . . provided on the base body 12 are inserted into the insertion holes 11, 11, . Insert. Then, the support pin 3 is inserted into the insertion holes 11, 11,...
6, 36, . . . to adjust the positional relationship between the flange 23 provided on the base body 12 and the filament 6 sealed in the glass bulb 2, and once the positional relationship is adjusted, The holding plate 7 is attached by suitable welding means such as plasma arc welding.
The connecting plates 9, 9 and 10 are connected to the support pins 36,
Fixed at 36,...

With this, the glass bulb 2 is attached to the holding plate 7,
The base body 12 via the support pins 36, 36, .
Supported by

The external lead wires 5b, 5b led out from the glass bulb 2 are connected to the front ends of the lead pieces 24b, 25b of the contact pieces 24, 25 by spot welding or the like. At this time, the external lead wires 5b, 5
b is a partition wall 3 formed on the front plate 28 of the core portion 26;
5, thereby avoiding contact with each other.

In the above manner, the glass bulb 2 is attached to the base body 12.
are combined to form the halogen light bulb 1.

Note that the skirt edges 9a, 9a, 10a formed on the outer peripheral edges of the connecting plates 9, 9, and 10 are connected to the front plate 28 of the connecting plates 9, 9, and 10 and the core portion 26.
If something gets into the part between the external lead wires 5b and 5, causing a problem, for example, cuttings of the conductor
It is possible to prevent an accident such as a short circuit between lead pieces 24b and 25.
The front end of the bulb, support pins 36, 36, . . . , external lead wires 5b, 5b, partition wall 35, etc. are hidden from the outside to improve the overall appearance of the bulb with a base.

(G Effect of the Invention) As is clear from the above description, the light bulb with a base of the present invention is a light bulb with a base in which a glass bulb in which a filament is enclosed is held in a base body made of a synthetic resin. The cap body is composed of an outer shell part and a core part holding a glass bulb, and the outer shell part has a forward-opening recessed part, and a part of the inner surface of the recessed part near the open end faces forward. A stepped portion is formed, and a portion closer to the front from the stepped portion is an inclined surface that is displaced outward as it goes forward, and a cylindrical portion that protrudes rearward is formed in the core portion, and a cylindrical portion is formed. The outer circumferential surface of the rear end of the core has an inclined surface that is inclined in the same direction and at approximately the same angle as the inclined surface of the outer shell as it goes rearward. The outer shell part and the core part are integrated by fitting into the front end part and then joining the inclined surface of the outer shell part and the inclined surface of the core part by welding.

Therefore, in the light bulb with a base of the present invention, there is nothing interposed between the abutting surfaces of the outer shell portion and the core portion, and the inclined surfaces of each other melt, and based on the melting, Since the sloped surfaces cross each other and the abutting surfaces of the two abut against each other, the dimensional accuracy of the cap body depends only on the molding accuracy of the outer shell and core, improving the dimensional accuracy of the cap body. .

[Brief explanation of the drawing]

Figures 1 to 9 show an example of an embodiment in which the light bulb with a base of the present invention is applied to a halogen light bulb.
Fig. 1 is an exploded perspective view, Fig. 2 is a perspective view, Fig. 3 is a vertical sectional view, Fig. 4 is an enlarged perspective view of the holding plate,
Figures 5 to 7 show the outer shell part. Figure 5 is a front view, Figure 6 is a rear view, Figure 7 is a view taken in the direction of the arrow in Figure 5, and Figure 8 is a view of the core part. Partial cutaway perspective view, No. 9
The figure is an enlarged sectional view of the main part showing the procedure for joining the outer shell and the core part from A to B, and Figure 10 is an enlarged sectional view of the main part showing the procedure for joining the outer shell part and the core part in a conventional light bulb with a cap. It is an enlarged sectional view of a main part shown in order from B to B. Explanation of symbols, 1...Light bulb with base, 2...Glass bulb, 6...Filament, 12...Base body, 1
3... Outer shell part, 17... Concave part, 20... Step part, 2
1... 13 inclined surface, 26... core part, 27...
Cylindrical portion, 29...26 inclined surface.

Claims (1)

[Scope of Claims] 1. A light bulb with a base that holds a glass bulb with a filament sealed in a base body made of synthetic resin, the base body being composed of an outer shell portion and a core portion that holds the glass bulb. A concave portion opening forward is formed in the outer shell portion, and a step portion facing forward is formed at a portion of the inner surface of the concave portion near the open end, and a portion toward the front from the step portion extends forward. Accordingly, the core part has a cylindrical part that protrudes outward, and the outer peripheral surface of the rear end of the cylindrical part becomes an outer shell as it goes rearward. The cylindrical part of the core part is fitted into the front end of the recess of the outer shell part, and then the slanted face of the outer shell part and the core part are inclined. 1. A light bulb with a cap, characterized in that an outer shell part and a core part are integrated by joining the inclined surfaces of the parts by welding.