JPH0631064U - Incandescent bulb base structure - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims at a base structure of an incandescent light bulb with high filament position accuracy, easy assembly, and high ring accuracy. In an incandescent light bulb assembled by joining a cap 15 fitted to a seal portion 14 at a lower portion of a bulb 11 and a ring-integrated base 16 to each other, a body 16a of the base 16 has an elastic bellows downward in the axial direction. 17 is provided, the cap 15 is inserted into the base 16, and then the tongue 17 is non-contact welded to the cap 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a base structure of an incandescent light bulb used for an incandescent light bulb with a single seal, for example.

[0002]

[Prior art]

 Conventionally, in the cap structure of a one-sided incandescent light bulb, a cap 4 is fitted to the seal portion 3 of the bulb 1 containing the filament 2 and the cap 4 is fixed to the cap 5, as shown in FIGS. In the case of a halogen bulb, the ring portion 7 of the base 5 is cut out as shown in FIG. 3 to provide a welding tongue 6 or the welding tongue 8 is provided at the bottom of the cap 4 as shown in FIG. Is resistance welded to the other side.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, A. As shown in Fig. 3, the ring 7 that is integrated with the base 5 is cut out to provide a tongue 6 that is erected upward. Therefore, when the cap 4 is assembled to the base 5, the tongue 6 must be wider than the diameter of the cap 4. Every time welding is performed, it is necessary to press the welding tongue. Also in the case of FIG. 4, the tongue 8 provided on the side of the cap 4 needs to be wider than the diameter of the die 5 and needs to be pressurized during welding. In either case, a pressure step is required during welding. There is a problem.

B. In the case of a light bulb with a small ring portion, since the tongue is formed by cutting out the tongue in the ring portion, the strength of the ring portion is lowered and the ring portion is easily deformed. As a result, there is a problem that the accuracy and strength of the ring portion are reduced.

Therefore, the present invention has been devised in view of the problems of the above-mentioned conventional techniques, and provides a cap structure for an incandescent light bulb, which has high filament position accuracy, is easy to assemble, and has high ring portion accuracy. It is an object.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the base structure of an incandescent light bulb according to the present invention, in the incandescent light bulb assembled by joining the cap fitted to the seal portion at the bottom of the bulb and the ring-integrated base, the body of the base is An elastic tongue is provided in the axially downward direction, the cap is inserted into the cap, and then the tongue is non-contact welded to the cap.

Further, the tongue may be provided with a protrusion for joining.

[0008]

[Action]

 An elastic tongue is provided axially downward on the body of the base so that the cap can be easily inserted into the base when the cap is assembled to the base. Also, during welding, there is no need to press the tongue on the cap side by non-contact welding.

Further, the non-contact welding can maintain the filament position accuracy at a high level.

Further, since no notch is formed in the ring portion, the strength is high, so that a highly accurate product can be manufactured.

[0011]

【Example】

 An embodiment will be described with reference to FIGS. 1 and 2. A filament 12 and an internal lead-in wire 13 are arranged in a capsule-shaped bulb 11, and a seal portion 14 is formed in the lower portion of the bulb 11. The seal portion 14 can be fitted into the cap 15.

The cap 15 is formed to have a diameter slightly smaller than the inner diameter of the barrel portion of the mouthpiece 16 so as to form a slight gap, and the cap 15 is movable by the gap.

The mouthpiece 16 is a ring-integrated mouthpiece in which the ring portion 20 is integrally formed, and a tongue portion 17a of the mouthpiece 16 is provided with a welding tongue 17 having elasticity in the axial downward direction in the circumferential direction. There are three or more locations in

Further, the tongue 17 is provided with a joining projection 18 so that the projection 18 can elastically contact the body portion of the cap to be inserted.

Focusing of the incandescent light bulb is performed by aligning the position of the filament 12 with the base 16, and adjusting the cap 15 by moving the cap 15 in the up / down, left / right, and front / rear directions. Non-contact welding is applied to the body of No. 15.

[0016] Welding is generally performed by resistance welding, but resistance welding requires a pressurizing force of about several kilograms, and when the pressurizing force is released, if the valve 11 moves a little, Since the positional accuracy of the filament is deteriorated, non-contact welding such as non-contact laser welding is effective in improving the positional accuracy of the filament 12.

Further, since the base 16 is fixed as a reference, the protrusion 18 is also at a fixed position, and even if the cap 15 is slightly inclined, the contact point of the protrusion 18 in contact with the cap 15 is relative to the diameter of the protrusion. Since the center of the protrusion is non-contact welded with a laser beam, it can be surely joined.

[0018]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. A. An elastic tongue is provided on the body of the die downward in the axial direction, and after inserting the cap to the die, the tongue is non-contact welded by laser welding, so that the tongue can be welded without being pressed. Therefore, the positional accuracy of the filament can be kept high.

B. Since the tongue has elasticity and is provided downward in the axial direction, the cap can be easily inserted into the base. Therefore, the assembly is easy, and the assembly can be easily automated.

C. Since no notch is provided in the ring part, the accuracy of the ring part can be increased, and the product with high strength and high accuracy can be manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view of an incandescent light bulb of the present invention.

FIG. 2 is an exploded perspective view of an incandescent light bulb of the present invention.

FIG. 3 is a perspective view of a conventional incandescent light bulb.

FIG. 4 is an exploded perspective view of another conventional incandescent light bulb.

[Explanation of Codes] 11 Valve 12 Filament 13 Internal Introducing Wire 14 Sealing Part 15 Cap 16 Base 16a Body 17 Vero 18 Protrusion 19 External Introducing Wire 20 Ring Part

Claims (1)

[Scope of utility model registration request] 1. An incandescent light bulb assembled by joining a cap fitted to a seal portion at the bottom of a valve and a ring-integrated base, wherein an elastic tongue is provided axially downward in the body of the base, A cap structure for an incandescent light bulb, which is formed by inserting a cap to the cap and then welding the tongue to the cap in a non-contact manner.