JPH0527949B2 - - 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. Industrial field of application B. Summary of the invention C. Prior art C-1. General background C-2. An example of a conventional light bulb with a base [Fig. 18] D. Problem to be solved by the invention E. To solve the problem Means F Example F-1 First Example [Figures 1 to 11] a Valve [Figures 1 to 7] b Mouth part [Figures 1 to 5, Figures 8 to 8] 1
Figure 1] b-1 Base plate [Figures 1 to 5, Figures 8 and 9] b-2 Base body [Figures 1 to 3, Figure 10]
Figures, Figure 11] b-3 Metal sleeve [Figures 1 to 3, Figures 10 and 11] c Attaching the cap plate to the metal sleeve d Terminal [Figure 1] F-1-a Deformation Example [Figure 12] F-2 Second embodiment [Figures 13 to 17] a Holding band [Figures 13 to 17] b Band attachment piece for metal sleeve [Figures 13 to 15] c Attachment of the holding band to the metal sleeveG Effects of the invention (A. Field of industrial application) The present invention relates to a novel light bulb with a base. Specifically, for example, a light bulb used as a light source for a headlamp, such as an automobile lamp, in particular, a bulb in which a filament is sealed, and a base body made of a thermoplastic synthetic resin and a base body of the base body. This relates to a light bulb with a base that is held in a base having a metal sleeve fixed to the tip, and the metal sleeve is fixed to the base body using a special fixing member or mechanical fixing means such as so-called caulking. A novel light bulb with a base that can be fixed without any problems and that can be done reliably, and that the fixed part is not visible from the outside of the light bulb, making the appearance desirable in terms of design. This is what we are trying to provide.

(B. Summary of the Invention) The present invention provides a method of holding a bulb in which a filament is enclosed in a cap part having a cap body made of a thermoplastic synthetic resin and a metal sleeve fixed to the tip of the cap body. To securely fix the metal sleeve to the cap body without using a special fixing member, etc., by fixing the base end of the metal sleeve in an embedded manner inside the cap body in a light bulb with a base consisting of: At the same time, the fixed portion is not visible from the outside of the light bulb, resulting in an excellent appearance in terms of design.

(C Prior Art) (C-1 General Background) For example, a light bulb used as a light source for an automobile headlamp is generally a bulb with a cap, which is composed of a bulb in which a filament is enclosed and a cap portion that holds the bulb. The lamp base has a structure such that its base portion is supported by a predetermined light bulb mounting portion provided on a lamp body such as a headlamp.

In this type of light bulb, the filament enclosed in the bulb needs to be precisely placed at a predetermined position of the headlight, for example, at the focal point of a parabolic reflector. The positional relationship between the part and the bulb, that is, the part of the base part that is positioned relative to the headlamp by being fixed to the light bulb mounting part of the lamp body of the headlamp;
For example, it is necessary to precisely adjust the positional relationship between the flange provided on the mouthpiece and the filament enclosed in the valve.

For this reason, in this type of base-equipped light bulb, the base is usually composed of a bulb holding member that holds the bulb, a base body that is supported by the headlight, and a base end that is fixed to the base body. , and a metal sleeve to which the valve holding member is fixed to the tip, and the valve holding member is fixed to the metal sleeve after the positional relationship is adjusted.

(C-2 An example of a conventional light bulb with a base) [Figure 18] By the way, there are various types of specific structures of such light bulbs with a base, and among them,
Some have a cap body made of synthetic resin.

FIG. 18 shows an example a of a conventional light bulb with a base having such a structure.

Reference numeral b designates a valve, in which filaments c and c' are sealed, the front end supports the filaments c and c', and the intermediate part is embedded in the pinch seal part d, and , lead wires e, e whose rear portions protrude from the pinch seal portion d.
and e′, e′ are provided.

f is the base portion.

g is the base body of the base part f, and the base body g
is formed of synthetic resin into a substantially cylindrical shape, and
A flange h for positioning the bulb a with a base with respect to the headlamp is integrally formed, and the inside thereof is divided approximately into two in the axial direction by a partition i. The tip j of the cap body g is formed to have a slightly smaller diameter than other parts, and a plurality of small recesses k, k, ... (only two are shown in the drawing) are formed on its outer peripheral surface. ing.

Reference numeral 1 denotes a sleeve formed of metal into a substantially cylindrical shape, and a plurality of projections m, m, . . . (only two are shown in the drawing) project from the front edge of the sleeve 1. The sleeve l has its rear part fitted onto the tip j of the base body g, and
In this state, the parts corresponding to the small recesses k, k, . . . are caulked toward the recesses k, k, . formed, and these protrusions n,
n, . . . are fixed to the base body g by engaging with the recesses k, k, .

o is a cap plate formed in a substantially cap shape, and the cap plate o is formed to face the engaging pieces p, p, ... formed on the cap plate o, and the engaging pieces p, p,... Engagement pieces (not shown) are attached to valve b by pinching the pinch seal portion d of valve b from both sides.

Then, with the cap plate o fitted into the sleeve l, the positional relationship between the flange h formed on the cap body g and the filaments c and c' is adjusted, and after this adjustment, , the projections m, m, . . . of the sleeve l and the base plate o are fixed by spot welding or the like.

(D) Problems to be Solved by the Invention As described above, in the conventional light bulb a with a cap, the sleeve l constituting the cap part f is connected to the cap body g.
In order to fix the sleeve l to the base body g, the proximal end of the sleeve l is fitted over the tip j of the base body g, and then a part of the sleeve l is caulked to the base body g. According to such a fixing means, if the caulking is loose or the caulking condition is weakened for some reason, the fixation of the sleeve l to the mouthpiece body g becomes uncertain. Therefore, if a strong impact is applied to the bulb a, there is a problem that the sleeve l may fall off from the cap body g.

In addition, if the sleeve l is loosely caulked with respect to the mouthpiece body g, the position of the sleeve l in the circumferential direction relative to the mouthpiece body g will not be stable, resulting in the filaments c and c'
There is also the problem that the position relative to the object becomes unstable.

Furthermore, according to such a fixing means, a plurality of dents are formed on the outer circumferential surface of the sleeve l by caulking, so there is a problem in terms of design, such as the appearance of the light bulb a becoming unsightly.

(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 bulb in which a filament is sealed, a base body made of a thermoplastic synthetic resin, and a base body made of a thermoplastic synthetic resin. In a light bulb with a base, which is held in a base having a metal sleeve fixed to the distal end of the main body, a plurality of notches are formed at the proximal edge of the metal sleeve, and at least the base end of the metal sleeve is attached to the base body. The metal sleeve is fixed to the base body by melting a part of the base body by high-frequency heating while the metal sleeve is fitted inside the base.

Therefore, according to the present invention, the metal sleeve is supported by the base body by having its proximal end fixed to the base body in an embedded manner, and the metal sleeve is supported by the base body, and the notch formed in the base end By engaging with the molten part of the cap body, it is fixed to the cap body in a state where it is prevented from coming out in the axial direction and from rotating in the circumferential direction. This is done inside the cap body, and the fixing can be done without using any separate fixing members or the like.

(F Example) Details of the light bulb with base of the present invention will be described below according to each example shown in the attached drawings.

In each of the embodiments shown in the drawings, the light bulb with a base of the present invention is applied to a halogen light bulb with a base used as a light source for an automobile headlamp.

(F-1 First Example) [Figures 1 to 11] Figures 1 to 11 show the first embodiment 1 in which the light bulb with a base of the present invention is applied to a halogen light bulb with a base. be.

(a Bulb) [Figures 1 to 7] 2 is a bulb of the halogen light bulb 1. 3 is the rear end (in Fig. 1, the upward direction is defined as the front, and the downward direction is defined as the rear. In the following explanation, directions will be referred to in this direction.)
is a pinch seal part 4, and the front end is closed with an exhaust part 5 to form a hermetically sealed glass bulb.

6, 6, . . . are lead wires that pass through the pinch seal portion 4 and have intermediate portions held by the pinch seal portion 4.

7, 7 are glass bridges, which are welded to sandwich the lead wires 6, 6, . . . from both sides within the glass bulb 3. Further, filaments 8, 8 are stretched between the tips of appropriate lead wires 6, 6, . . . .

The pinch seal portion 4 has a substantially flat shape, and has protrusions 9 on both sides in the width direction.
9,... are formed, and the cross-sectional shape is approximately I-shaped. Further, engagement protrusions 10, 10 are formed at positions near the lower end of both sides of the pinch seal portion 4.

Incidentally, the glass bulb 3 is filled with an inert gas and a suitable halogen gas.

The valve 2 is formed as described above.

(b Mouth Portion) [FIGS. 1 to 5, FIGS. 8 to 11] Reference numeral 11 denotes a mouthpiece portion that holds the valve 2. As shown in FIGS.
The cap portion 11 includes a cap plate that holds the glass bulb 3 of the bulb 2 with the pinch seal portion 4, a cap body supported by a lamp body of a predetermined headlight, and a cap body attached to the cap body, and the cap plate and a metal sleeve to which it is fixed.

(b-1 Base plate) [Figures 1 to 5,
FIGS. 8 and 9 ] 12 is a base plate.

The cap plate 12 is made of a metal plate having spring elasticity, and has a substantially circular planar shape.

A short cylindrical annular portion 13 is formed from the periphery of the base plate 12.

Two pairs of intermediate holding pieces 15, 15, 15', 15' and two pairs of side holding pieces 16, 16, 16', 16' are formed in a cut-and-raised shape on the holding surface 14 of the cap plate 12. . intermediate holding pieces 15, 15 and 15',
15' are formed to face each other, are bent rearward from the holding surface 12, and are inclined so that the rear ends 17, 17 and 17', 17' approach each other. Side holding piece 16,1
6 and 16', 16' are formed to face each other, and are directed forward from the holding surface 14 and from the front end 1.
8, 18 and 18', 18' are inclined and bent so as to approach each other. And these presser pieces 15, 15, 15', 15', 16, 16,
There are slits 19, 19, 1 between each of 16' and 16' to give more elasticity to these holding pieces.
9, 19', 19', 19' are formed.

In addition, the side holding pieces 16, 16 and 16', 1
Spaces 20, 20 are formed outside 6',
By connecting these spaces 20, 20 with the spaces formed by forming each of the holding pieces, approximately I A character-shaped space is formed.

Thus, the pinch seal portion 4 of the glass bulb 3 of the bulb 2 is connected from above to the holding pieces 15 and 15', 15 and 15', 16 and 16', and 16 of the cap plate 12.
and 16', as can be clearly seen in FIG.
8, 18', 18' are inserted until they touch the rear end of the glass bulb 3. In this state, intermediate presser piece 1
5, 15, 15', 15' are the rear end parts 17, 1
7, 17', 17' are behind the holding surface 14 and the valve 2
It comes into elastic contact with the sides of the middle part of the pinch seal part 4 from both sides. At this time, the side presser pieces 16, 16, 1
The outer side edges of 6', 16' are brought into contact with the mutually opposing side surfaces of the protrusions 9, 9, . . . of the pinch seal portion 4. In addition, intermediate holding pieces 15, 15, 15',
The rear ends 17, 17, 17', 17' of 15' are engaged with the engaging protrusions 10, 1 formed on the side surface of the pinch seal part 4.
0, thereby preventing the valve 2 from coming off from the base plate 12.

(b-2 Base body) [Figures 1 to 3, 1
0, FIG. 11] Reference numeral 21 denotes a base body, which is molded from a thermoplastic synthetic resin.

The mouthpiece body 21 has a substantially cylindrical shape, and its interior is divided into a valve holding part 23 and a connector part 24 by a partition wall 22 provided in the middle. The partition wall 22 has terminal mounting holes 25,
25, 25 are formed. In addition, the base body 2
A flange 26 projecting outward is integrally formed on the outer peripheral surface of the flange 26, and the outer peripheral edge of the flange 26 has three positioning notches 27, 27,
27 (only two are shown in the drawing) are formed.

28 is an annular fitting groove formed on the outer peripheral surface of the base body 21 at a position forward of the flange 26;
An O-ring shaped sealing material is fitted into the fitting groove 28 and contributes to waterproofing between the base body 21 and the lamp body when the light bulb is attached to the lamp body.

Reference numeral 29 denotes an annular step portion formed at the intersection of the inner circumferential surface of the valve holding portion 23 and the front surface of the partition wall 22, and the rear end portion of a metal sleeve, which will be described later, is supported in an embedded manner in the step portion 29. It is becoming more and more like this.

Note that a predetermined terminal is provided inside the base body 21, which will be described later.

(b-3 Metal sleeve) [Figures 1 to 3,
10 and 11 ] 30 is a metal sleeve.

The metal sleeve 30 has an outer diameter that allows the valve holding portion 23 of the cap body 21 to fit therein, and an inner diameter that allows the annular portion 13 of the cap plate 12 to fit therein. At the front end of the metal sleeve 30, several, for example, six to eight small protrusions 31, 31, . . . are integrally provided to project forward.

Further, on the rear end edge of the metal sleeve 30, a plurality of notches 32, 32, which have a substantially inverted trapezoidal shape when viewed from the side, are provided.
... are formed at appropriate intervals in the circumferential direction.

Therefore, the means for fixing this metal sleeve 30 to the base body 21 is shown in FIGS. 10 and 1.
This will be explained with reference to FIG.

Reference numerals 33 and 33 denote electrodes of a known high-frequency heating device, and the side surface of these electrodes 33 and 33 on the side facing the base body 21 corresponds to the portion of the outer peripheral surface of the base body 21 that corresponds to the step portion 29, that is, It is formed into an arcuate surface that substantially exactly contacts the bottom surface of the fitting groove 28 .

Therefore, first, the electrodes 33, 33 are connected to the base body 21.
the bottom surface of the fitting groove 28.

Also, the metal sleeve 30 is attached to the valve holding member 23.
, so that the rear end is pressed against the stepped portion 29. As a result, the rear end portion of the metal sleeve 30 is heated by high frequency induction, and is embedded in the step portion 29 while melting the step portion 29. and,
Such embedding is done to such an extent that the notches 32, 32, . . . are buried in the stepped portion 29.

As a result, a part of the step 29 enters the notches 32, 32, ... of the metal sleeve 30 and is solidified, so that the notch 32, 32, ... and the step 29 are connected to the axis of the base 11. direction.

Thus, the rear end of the metal sleeve 30 is embedded in the base body 21, with most of the rear end being fitted into the base body 21.

(c Attachment of the cap plate to the metal sleeve) After the above-described cap plate 12 is adjusted in position relative to the cap body 21 while holding the valve 2, it is attached to the metal sleeve 30 fixed to the cap body 21. .

That is, the annular portion 13 of the base plate 12 is fitted into the metal sleeve 30 fixed to the base body 21 . Then, the annular portion 13 is slid against the metal sleeve 30 to adjust the positional relationship between the flange 26 of the mouthpiece body 21 and the filaments 8, 8 of the valve 2 to be correct, and the filaments 8, 8
When the positional relationship between the metal sleeve 30 and the flange 26 is correct, the projecting pieces 31, 31,
... and the annular portion 13 of the base plate 12 are fixed by spot welding.

In addition, this metal sleeve 30 and the cap plate 12
The fixing between them is not limited to spot welding, but may be done by other fixing means, such as soldering. If soldering is used, the protrusions 31, 31, . . . for spot welding are not required.

(d Terminal) [Fig. 1] Reference numerals 34, 34, and 34 are terminals disposed within the connector portion 24 of the base body 21. Each terminal 3
4 has a mounting piece 35 bent at right angles to the main part at its base end, and a cylindrical part 36 protruding toward the opposite side of the main part is formed on the mounting piece 35.

Therefore, the mounting pieces 3 of the terminals 34, 34, 34
Cylindrical portions 36, 36, 3 formed in 5, 35, 35
6 is inserted into the terminal mounting holes 25, 25, 25 formed in the partition wall 22 of the cap body 21 from the connector part 24 side, and the tip part of each cylindrical part 36, 36, 36 projects toward the valve holding part 23 side. This causes the terminals 34, 34, 34 to attach to the base body 21.
The connector section 24 is arranged within the connector section 24 of the connector.

Incidentally, the lead wires 6, 6, . Solder 37, 37, 37 to the mounting pieces 35, 35, 35 of 34, 34
be done.

(F-1-a Modification) [Fig. 12] Fig. 12 shows a modification of the above-described halogen light bulb 1 with a base.

The only difference between this modified example and the above-described halogen lamp with a cap is the melted portion formed in the cap body. Therefore, only the main parts of the halogen light bulb 1 are shown in FIG. 12, and the explanation will be given only on the above-mentioned differences, and the same reference numerals used for the halogen light bulb 1 with a cap will be given to the same parts. This may be omitted. The relationship between the use of symbols and the omission of explanations will be the same in the explanation of the second embodiment described later.

Reference numeral 38 denotes an annular protrusion formed on the front surface of the partition wall 22 of the mouthpiece body 21, and the annular protrusion 38 connects the metal sleeve 30 with the inner circumferential surface of the valve holding portion 23.
The metal sleeve 3 is arranged with a gap 39 having a width approximately equal to or slightly narrower than the thickness of the metal sleeve 3
The depth of the notches 32, 32, .

Therefore, the electrodes 33, 33 of the high-frequency heating device are brought into contact with a portion of the outer peripheral surface of the base body 21 that corresponds to the annular protrusion 38. Then, the metal sleeve 30 is inserted into the valve holding part 23 until its rear end surface comes into pressure contact with the tip of the annular protrusion 28, and in this state, it is heated by high frequency induction. Therefore, the heated rear end of the metal sleeve 30 melts the annular protrusion 28 and the portion facing it, and the rear end of the metal sleeve 30 is fitted into the gap 39.

In this way, part of the melted annular protrusion 38 and the portion facing it enters the notches 32, 32, . . . formed in the metal sleeve 30. This state is approximately the same as the state shown in FIG.

Thus, the rear end portion of the metal sleeve 30 is fixed to the base body 21 in a substantially embedded manner.

(F-2 Second embodiment) [Figures 13 to 17
FIGS. 13 to 17 show a second embodiment 1A in which the light bulb with a base of the present invention is applied to a halogen light bulb with a base.

The halogen bulb with a cap shown in this second embodiment differs from the halogen bulb with a cap 1 shown in the first embodiment in that the member that holds the bulb 2 in the cap 11 is a band-shaped member. In addition, the portion of the metal sleeve 30 that supports the valve holding member has the above-mentioned protrusion 3.
The only difference is that it is different from 1, 31, and so on.

(a Holding band) [Figs. 13 to 17] Reference numeral 40 denotes a holding band that holds the valve 2 by wrapping around the pinch seal portion 4 of the valve 2, and the holding band 40 has spring elasticity. It is formed by press forming a single sheet metal material.

Reference numeral 41 denotes a holding portion bent so as to form a substantially U-shape as a whole when viewed from the front and rear directions;
1 consists of two holding pieces 42, 43 facing each other and a connecting piece 44 connecting one end of the holding pieces 42, 43. Approximately middle portions of the holding pieces 42 and 43 in the longitudinal direction are bent inward from each other so that the interval therebetween is narrower than the interval between substantially both end portions. The end on the connecting piece 44 side is bent at a substantially right angle toward the other holding piece 42, and further bent at a right angle from the tip of the bent portion toward the side opposite to the connecting piece 44.

Therefore, the anti-connection piece 4 of the two holding pieces 42 and 43
In a state where the end portions on the four sides are joined, a space having a substantially I-shape and having substantially the same size as the outer peripheral shape of the pinch seal portion 4 of the valve 2 is formed.

Note that a protrusion 45 that protrudes toward the connecting piece 44 is formed approximately at the center of a portion 43a of one of the holding pieces 43 that faces the connecting piece 44 in parallel, and the connecting piece 44 is similar to the one described above. It is formed in a substantially dogleg shape bent toward the portion 44a side.

Reference numerals 46 and 47 are projecting pieces that are bent from substantially the middle of the front edges of the holding pieces 42 and 43 toward opposite sides.

Further, reference numerals 48 and 49 are mounting portions that extend from approximately the middle of the rear end edges of the holding pieces 42 and 43 toward opposite sides, and are approximately fan-shaped and gradually widen toward the tips. The diameter of the circle circumscribing the tip edge of each of the attachment parts 48 and 49 is equal to or slightly smaller than the inner diameter of the metal sleeve 30. Projecting pieces 50, 50 protrude forward on the parts near the ends of the mounting pieces 48 and 49 on both sides.
and 50', 50' are formed in a cut-and-raised shape.
51, 51 and 51', 51' are holes formed by cutting and raising the projecting pieces 50, 50 and 51', 51'.

The holding band 40 configured in this manner is wrapped around the pinch seal portion 4 of the valve 2 in the following manner.

That is, the holding pieces 42 and 43 are placed in the space surrounded by the holding pieces 42 and 43 of the holding part 41 and the connecting piece 44.
Insert the pinch seal portion 4 of the valve 2 in a state in which the valve 2 is slightly expanded. In this insertion, the glass bulb 3 is inserted into the protruding piece 4.
6 and 47, and then the holding pieces 42 and 43 are brought into contact with the pinch seal portion 4. In this state, the base ends of the attachment parts 48 and 49 are attached to the engagement protrusion 10 formed on the pinch seal part 4.
10. Then, the ends of the holding pieces 42 and 43 on the side opposite to the connecting piece 44 are joined, and this part is fixed by spot welding or the like.

Therefore, both end surfaces of the pinch seal portion 4 are relatively connected to the dogleg-shaped bending point of the connecting piece 44 and one of the holding pieces 4.
Since the protrusions 45 of No. 3 are pressed outward, the pinch seal portion 4 is held in a tightened state by the holding portion 41 due to the reaction force generated by this pressing force.

The valve 2 is prevented from slipping forward from the holding band 40 by engaging protrusions 10, 10 formed on the pinch seal portion 4 with the base ends of the mounting portions 48, 49. , the glass bulb 3 is moved backward relative to the holding band 40 by the projections 46, 4.
7.

(b Band attachment piece of metal sleeve) [Figures 13 to 15] 52, 52, ... are band attachment pieces provided so as to protrude forward from the front edge of the metal sleeve 30A, and these band attachment pieces 52, 52, . . . have front end portions 53, 53, .
1, 51', and 51', the rear portions from the middle portion are inclined so as to be positioned corresponding to 1, 51', and 51'.

Note that the length of the metal sleeve 30A in this embodiment is slightly shorter than the length of the valve holding portion 23 of the base body 21. In addition, the band mounting piece 5
2, 52, . . . front end portions 53, 53, .
The direction is parallel to each corresponding one of 0'.

(c. Attachment of Retaining Band to Metal Sleeve) Therefore, the retaining band 40 is attached to the metal sleeve 30A in the following manner while holding the valve 2.

That is, the band holding piece 5 of the metal sleeve 30A
2, 52,... are inserted into the holes 51, 51, 51', 51' of the holding band 40, and the front ends 53, 53,...
51', 51' to adjust the positional relationship between the filaments 8, 8 of the valve 2 and the flange 26 of the mouthpiece body 21 to be correct, and when the adjustment is made correctly, remove the band. Mounting piece 5
The front end portions 53, 53, . . . of the holding bands 2, 52, .

As a result, the valve 2 is held on the cap body 21 via the holding band 40 and the metal sleeve 30A.

(G Effect of the Invention) As is clear from the above description, the light bulb with a cap of the present invention comprises a bulb in which a filament is enclosed, a cap body made of a thermoplastic synthetic resin, and a distal end portion of the cap body. A light bulb with a base, which is held in a base having a metal sleeve fixed to the base, wherein a plurality of notches are formed in the proximal edge of the metal sleeve, and at least the base end of the metal sleeve is attached to the base body. It is characterized in that the metal sleeve is fixed to the base body by melting a part of the base body by high-frequency heating while the metal sleeve is fitted inside.

Therefore, according to the present invention, the metal sleeve is supported by the base body by having its base end fixed to the base body in an embedded manner, and the metal sleeve is supported by the base body, and the notch formed in the base end By engaging with the melted part of the cap body, it is fixed to the cap body in a state where it is prevented from slipping out in the axial direction and from rotating in the circumferential direction, so the fixed state is extremely stable. It becomes what it is.

As a result, the positional relationship between the filament enclosed in the bulb and the mouthpiece body is stably maintained.

Furthermore, since the metal sleeve and the cap body in the present invention are fixed inside the cap body, the fixed portion is not visible from the outside of the bulb, and therefore the appearance of the bulb is significantly reduced. It becomes smooth and crisp.

Moreover, in the present invention, the means for fixing the metal sleeve to the base body is simply to heat the metal sleeve by high-frequency heating and thereby melt a part of the base body. The number of members does not increase, and the number of man-hours required for fixing them does not increase.

In the above-mentioned embodiment, the notch formed in the metal sleeve was shaped to have a substantially inverted trapezoidal shape when viewed from the side, but in this case, the molten part of the base body would not fit into the metal sleeve. When it enters the formed notch and solidifies, a part of the cap body and a part of the metal sleeve will engage with each other in the axial direction, making it difficult to remove the metal sleeve from the cap body. This means that the stoppage will be more secure.

[Brief explanation of the drawing]

Figures 1 to 11 show the first light bulb with a base of the present invention.
Fig. 1 is a side view of the whole, partially shown in longitudinal section; Fig. 2 is a perspective view of the whole;
Fig. 3 is an exploded perspective view of the entire structure, Fig. 4 is a perspective view of the valve attached to the cap plate, Fig. 5 is an enlarged sectional view of the main parts showing the state in which the valve and the cap plate are connected, and Fig. 6 7 is an enlarged side view of the valve, FIG. 7 is a sectional view taken along the line - in FIG. 6, FIG. 8 is an enlarged front view of the cap plate, FIG. 9 is an enlarged side view of the cap plate, and FIGS. The figures show an example of the work process for attaching the metal sleeve to the base body. Figure 10 is an enlarged sectional view of the main parts before the metal sleeve is attached to the base body, and Figure 11
The figure is an enlarged sectional view of the main part in a state where the metal sleeve is attached to the base body, FIG. 12 is an enlarged sectional view of the main part showing a modification of the base body, and FIGS. 13 to 17.
The figures show a second embodiment of the light bulb with a cap according to the present invention, in which Fig. 13 is a side view of the whole, partially shown in longitudinal section, Fig. 14 is a perspective view of the whole, and Fig. 15 is a diagram of the whole. FIG. 16 is an enlarged front view of the bulb holding band, FIG. 17 is an enlarged perspective view of the bulb holding band, and FIG. 18 is a longitudinal sectional side view showing an example of a conventional light bulb with a base. Explanation of symbols, 1... Light bulb with base, 2... Bulb, 8... Filament, 11... Base part, 21
...Cap body, 29... Part (of the cap body), 3
0...Metal sleeve, 32...Notch, 39...
Part (of the base body), 1A...Light bulb with base, 30
A...Metal sleeve.

Claims (1)

[Scope of Claims] 1. A cap with a cap comprising a bulb in which a filament is sealed and held in a cap portion having a cap body made of thermoplastic synthetic resin and a metal sleeve fixed to the tip of the cap body. A light bulb, in which a plurality of notches are formed in the proximal edge of the metal sleeve, and at least the proximal end of the metal sleeve is fitted into the cap body and a portion of the cap body is melted by high-frequency heating. A light bulb with a cap, characterized in that a metal sleeve is fixed to the cap body.