JPS6343255A - Electric bulb with base - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 B9 Summary of the invention C6 Background art [Figure 10] D0 Problem to be solved by the invention "Figure 10" E1 Means for solving the problem F. Example [Figure 1] a, glass bulb [FIG. 1 to FIG. 3, b, holding plate [FIG. 1 to FIG. 4] C1 cap body [
Figures 1 to 3, Figures 5 to 9] c-1, Outer shell [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 part [Figures 1 to 3, Figures 8 and 9] c-4, Holding part [Figure 1] [Fig. 3 to Fig. 8] C-5. Connection between the outer shell and the core [Fig. 9 d, Connection between the glass bulb and the cap body] G3 Effects of the invention (A. Field of industrial application) The present invention relates to a novel electric lamp 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. It is an object of the present invention 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 ultrasonically welded to the outer shell part. 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, In addition, since both inclined surfaces extend over each other, they are joined to a predetermined depth, and the dimensional accuracy after joining the outer shell portion and the core portion is improved.

(C0 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 is formed at the front end of the outer shell. A step C facing forward is formed on the inner surface of the recess near the opening 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 recessed portion of the outer shell portion a.

Thus, the cylindrical part e of the core part d is fitted into the recess 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 of the outer shell part a. be brought into contact. Therefore, ultrasonic vibrations are applied to the stepped portion C of the outer shell portion a and the rear end surface f of the core portion d, thereby melting the stepped portion C and the rear end surface f of the core portion d, and bonding them together.

(D. Problem to be solved by the invention) [Fig. 10] When the outer shell part a and the core part d have the above structure, the stepped part C of the outer shell part a and the core part d should be butted against each other. There is no place for the molten resin g to escape between the rear end face of the cylindrical part e and the molten resin g is interposed between the step C and the rear end face f of the cylindrical part e, and the molten resin g is interposed between the step C and the rear end face f of the cylindrical part e. There is a problem in that the shaped portion e and the rear end surface f do not come into close contact with each other, and the core portion d protrudes forward from the intended position accordingly, impairing dimensional accuracy.

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 the 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 composed of a synthetic resin outer shell part and a core part, and the core part A light bulb with a base that holds a glass bulb and connects the glass bulb to the base body by ultrasonically welding the core to the outer shell, and the welded parts of the outer shell and core are aligned approximately in the same direction. They are formed on inclined surfaces that are inclined at the same angle.

Therefore, in the light bulb with a base 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 sides are not melted. ,
Due to the melting, the sloped surfaces cross over each other 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. The dimensional accuracy of the cap body is improved.

(F. Example) [Figures 1 to 9] Details of the light bulb with base of the present invention will be described below according to the illustrated example. 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 a halogen light bulb 1, one end of which is closed with a substantially flat pinch seal part 3, and the other end closed with an exhaust part 4. It is sealed, and the inside is filled with inert gas and a specified halogen.

5.5 is a lead wire, 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 parts 5a, 5a inside the glass bulb 2 are used as internal lead wires, Portion 5 led out from the pinch seal portion 3
b and 5b are external lead wires. A filament 6 is stretched between the tips of the internal lead wires 5a, 5a.

(b, Holding Plate) [Figs. 1 to 4] Reference numeral 7 denotes a holding plate for holding the glass bulb 2 and connecting it to a base body, which will be described later, and is formed 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 bent so as to be wrapped around the pinch seal portion 3 of the glass bulb 2 so as to form a substantially rectangular shape when viewed from the front and rear directions, and a connecting piece 8 is provided at the joint portion of both ends.
a, 8a are formed.

The metal band 8 is connected to the pinch seal portion 3 of the glass bulb 2.
In this state, the connecting pieces 8a, 8a are connected by spot welding or the like.

In this way, the metal band 8 is fixed to the pinch seal portion 3.

The connecting plates 9.9 and 10 are both provided along the rear end edge of the long side of the metal band 8, ie, along the edge on the opposite side to the side where the glass bulb 2 is located.

The connecting plates 9.9 are the connecting pieces 8a, 8a of the metal band 8.
The other connecting plate 10 has connecting pieces 8a, 8a of the metal band 8. It is stored on ships bent outward from the rear end edge of the long side opposite to the long side at a substantially right angle. Further, skirt edges 9a, 9a, 10a projecting rearward from the outer peripheral edge of each connecting plate 9, 9, 10 are integrally formed.

The connecting plate 9.9 has one insertion hole each, and the connecting plate 10 has two spaced insertion holes 11.11.
... are formed, and the opening edge of each insertion hole 11, 11, ... is slightly raised toward the front, and is formed in a short cylindrical shape.

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

(c-1, outer shell) [Figs. 1 to 3, 5 to 7, and 9] 13 is an outer shell, which is formed by molding a thermoplastic synthetic resin, and has a contact The pieces are held together.

The outer shell portion 13 includes a main portion 14 having a substantially cylindrical shape and a connector portion 15 integrally projecting sideward from the rear end of the main portion 14.
It consists of 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 has a recess 17 that opens at the front end and reaches almost the rear end.
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 displaced inward as it goes rearward. It is formed on an inclined surface 21.

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) [FIGS. 1 to 3, FIGS. 5 to 7] 24.25 is a contact piece made of a conductive material.

Each of these contact pieces 24 and 25 has a side shape of L.
It has a letter-shaped shape, and the vicinity of the L-shaped bent portion is embedded in the rear end portion 19 of the main portion 14 of the cap body 12 . That is, the main portion 14 and the contact pieces 24, 25 are integrally joined by so-called insert molding.

One end 24a of these contact pieces 24, 25
, 25a protrude into the recess 16 of the connector portion 15 and serve as a connector piece.

Further, the parts 24b and 25b to which the other ends of the contact pieces 24 and 25 belong are lead pieces that extend along the axial direction of the recess 17 of the main part 14, and whose front ends slightly protrude from the front end of the recess 17. There is.

A portion 24 embedded in the rear end portion 19 of the main portion 14
c and 25c 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 substantially aligned along a line that intersects the central axis of the main portion 14 and extends in the axial direction of the connector portion 15, and are located on opposite sides across the word line. It is arranged so that

By arranging the lead pieces 24b and 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, Figures 8, 9
Figure] 26 is a core portion, which is formed by molding a thermoplastic synthetic resin.

The core portion 26 is a cylindrical portion 2 having a short axial length.
7 has a shape as if it were 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. . and,
The slope of the slope 29 is similar to the slope 2 of the large diameter portion 18 of the outer shell portion 13.
It is in the same direction as 1 and has approximately the same inclination angle.

A step portion 31 facing rearward is formed on the outer circumferential 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 circumferential surface of the cylindrical portion 27 along the axial direction.

Slits 33.34 are formed in the center of the front plate 28 of the core portion 26, and these slits 33.3
4 is the lead piece 24b, 25b of the contact piece 24.25
It is formed in a positional relationship corresponding to the positional relationship of , and serves as an insertion portion for inserting the lead piece 24b525b. In addition, the rear end frontage 33a13 of the slit 33.34
4a is widened in a chamfered manner to facilitate insertion of the lead piece 24b125b.

Reference numeral 35 denotes a partition wall formed integrally with the front plate 28, and protrudes forward from a position between the slits 33 and 34 on the front surface of the front plate 28.

(c-4, holding part) [Figs. 1 to 3, Fig. 8] 36.36, .

The bases of these support bins 36, 36, . . . are embedded in the front plate 28 of the core portion 26 by so-called insert molding, and project 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 part and core part) [Fig. 9] Therefore, the core part 26 is located at the front end of the recess 17 formed in the main part 14 of the outer shell part 13, that is, at the large diameter part. 18. At this time, the projections 22 formed on the large diameter portion 18 engage with the grooves 32 formed on the core portion 26, thereby positioning the outer shell portion 13 and the core portion 26 in the circumferential direction. The lead piece 24 of the contact piece 24.25
b, 25b are inserted into the slits 33.34 formed in the front plate 28 of the core part 26, and the front ends of the lead pieces 24b, 25b are inserted from the front plate 28 inside the support bins 36.36,'... Forced to protrude forward.

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. As a result, the contact surfaces between the inclined surfaces 21 and 29 are melted,
Accordingly, the cylindrical portion 27 of the core portion 26 is gradually fitted into the large diameter portion 18 of the outer shell portion 13, and finally, the cylindrical portion 27 of the core portion 26 is fitted into the large diameter portion 18 of the outer shell portion 13.
The fitting operation of the cylindrical portion 27 into the large diameter portion 18 stops at the point where the rear end surface 30 of the cylindrical portion 27 abuts against the stepped portion 20 of the large diameter portion 18 (see FIG. 9(B)). The ultrasonic vibrations applied to the contact surface are stopped.

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

In addition, 37 is a fitting groove formed so as to extend annularly between the tip surface 14a of the main part 14 of the outer shell part 13 and the outer peripheral edge 28a of the front plate 28 of the core part 26. For example, an O-ring-shaped gasket 38 is fitted to 37.

(d. Combining 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 bin 36 provided on the base body 12.
36, . . . are the insertion holes 11. formed in the connection plates 9.9 and 10 of the holding plate 7 holding the glass bulb 2.
Insert into 11,...

Then, the support pin 3 is inserted into the insertion hole 11.11, .
6. Adjust the positional relationship between the flange 23 provided on the cap body 12 and the filament 6 sealed in the glass bulb 2 by sliding 36, . . . , and when the positional relationship is adjusted. , connecting plates 9.9 and 10 of the holding plate 7 by suitable welding means such as plasma arc welding.
are fixed to the support bins 36, 36, .

Thereby, the glass bulb 2 is supported by the base body 12 via the holding plate 7, the support bottles 36, 36, .

And an external lead wire 5b led out from the glass bulb 2,
5b is the lead piece 24b, 25 of the contact piece 24.25
It is connected to the front end of b by spot welding or the like. At this time, the external lead wires 5b, 5b are connected to the front plate 28 of the core section 26.
They can be reliably separated by the partition walls 35 formed in the same direction, and they can be prevented from coming into contact with each other.

In the manner described above, the glass bulb 2 is coupled to the base body 12, and the halogen light bulb 1 is formed.

Note that the skirt edges 9a, 9a, and 10a formed on the outer peripheral edges of the connecting plates 9.9 and 10 are
．． 10 and the front plate 28 of the core part 26 and cause an inconvenience, for example, an accident such as a short circuit between the external lead wires 5b and 5b caused by cuttings of the conductor. In addition to preventing this, the lead piece 24b
, 25b, 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 base.

(G. Effects 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 sealed is held in a base body made of synthetic resin. The cap body is formed from an outer shell and a core fixed to the front end of the outer shell and holding the glass bulb, and the outer shell and the core are bonded by ultrasonic melting. The welded portion between the outer shell portion and the core portion is characterized in that the welded portions of the outer shell portion and the core portion are sloped surfaces that are sloped at substantially the same angle in the same direction.

Therefore, in the light bulb with a cap 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 due to the melting, they mutually contact each other. The slanted surfaces of the cap cross over each other, 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, 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, with Figure 1 being an exploded perspective view, Figure 2 being a perspective view, and Figure 3 being a longitudinal sectional view. , Fig. 4 is an enlarged perspective view of the holding plate, Fig. 5 to Fig. 7 show the outer shell part, Fig. 5 is a front view, Fig. 6 is a rear view, and Fig. 7 is the same as Fig. 5. ■A view in the direction of the arrows, Figure 8 is a partially cutaway perspective view of the core part, and Figure 9 shows the procedure for joining the outer thigh part and the core part from (A) to (
B) is an enlarged cross-sectional view of the main parts shown in order, and FIG.
It is an enlarged sectional view of a main part shown in order from A) to (B). Explanation of symbols 1...Light bulb with base, 2...Glass bulb, 6...
filament, 12... base body, 13... outer shell part, 21...
・Slanted surface, 26...Core part Fig. 2 @ Fig. 3 2 L Nami, j Mito station 1L Oko Fig. 4 Ma 25 (7 Sanmenguchi Fig. 5 Fig. 13... Outer shell rear view No. 6 Figure 13 - Outer shell storage - Two spoons figure Figure 7 Figure 8 Figure 9 (B)

Claims (1)

[Scope of Claims] A light bulb with a cap that holds a glass bulb with a filament sealed in a cap body made of synthetic resin, the cap body being fixed to an outer shell and a front end of the outer shell. and a core portion holding the glass bulb, the outer shell portion and the core portion are joined by ultrasonic welding, and the welded portions of the outer shell portion and the core portion are inclined in the same direction and at approximately the same angle. A light bulb with a base characterized by a sloped surface.