JPH0433104B2 - - 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 D Problem to be solved by the invention E Means for solving the problem F Example F-1 First example [Figs. 1 to 8 ] a Glass bulb [Figures 1 to 4] b Holding band [Figures 1 to 4] c Base part [Figures 1 to 8] c-1 Outer shell c-2 Contact piece c- 3 Core part c-4 Holding part c-5 Connection between outer shell part and core part d Connection between glass bulb and cap part F-2 Second embodiment [Figures 9 to 11] a Holding band b Connection between the glass bulb and the cap c. Modification of the holding band [Fig. 12, 13
Figure ] G Effect of the invention (A Field of industrial application) The present invention relates to a novel light bulb with a base. Specifically, in a type of light bulb with a base that connects the glass bulb and the cap via a retaining band wrapped around the pinch seal part of the glass bulb, the positional relationship between the glass bulb and the retaining band is accurate, and the retaining band It is an object of the present invention to provide a novel light bulb with a cap, which can securely hold a glass bulb by the holding band and avoid local concentration of stress due to the wrapping of the holding band.

(B Summary of the Invention) The light bulb with a cap of the present invention has a cap that connects a glass bulb having a pinch seal portion having a substantially rectangular cross-sectional shape to the cap portion via a retaining band wrapped around the pinch seal portion. In the light bulb, a plurality of protrusions are formed on the side surface of the pinch seal part, and the protrusions are engaged with recesses formed in the holding band, thereby adjusting the positional relationship between the glass bulb and the holding band. This makes it possible to ensure accuracy and ensure that the glass bulb is held by the holding band, and further to avoid local concentration of stress due to the wrapping of the holding band.

(C. Prior Art) Some bulbs with caps include those in which a glass bulb and a cap are connected via a holding band wrapped around a pinch seal portion of the glass bulb.

(D Problems to be Solved by the Invention) In the case of a conventional light bulb with a cap of the type in which a glass bulb is connected to the cap via a holding band wrapped around the pinch seal part, the glass bulb is fixed by the holding band. The planar surface of the pinch seal is intended to be in close contact with the retaining band to ensure retention.

However, even if the crushing surface of the pincher that pinch-seals the pinch seal portion is formed, the flat surface of the pinch seal portion is deformed during the cooling process after pinch sealing, and does not become a flat surface as designed. For this reason, when the holding band is wrapped around the pinch seal part, the contact between the pinch seal part and the holding band is uneven, and the tightening force of the holding band is concentrated on a specific part of the glass bulb. Therefore, there was a problem in that burrs and cracks were likely to occur in the stress concentrated portions.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the light bulb with a base of the present invention has a pinch seal portion having a substantially rectangular cross-sectional shape. A holding band wrapped around the pinch seal part has a concave part that engages with the protruding part, and the glass bulb and the cap part are connected through the holding band. It is.

Therefore, according to the present invention, the protrusion of the pinch seal portion and the recess of the holding band engage with each other.
Since the positional relationship between the glass bulb and the holding band is determined accurately, all that is left to do is to align the holding band and the cap to ensure that the positional relationship between the glass bulb and the cap is in the normal state. At the same time, the glass bulb can be easily held securely.
In addition, the pressure due to the wrapping of the holding band is received by a plurality of protruding surfaces, and local concentration of stress is avoided, and the protruding surface where the area receiving the pressure is originally planned is Therefore,
It is possible to prevent the occurrence of cracks and cracks in the glass bulb.

(F Example) Below, the details of the light bulb with base of the present invention will be explained according to the illustrated example.

(F-1 First Embodiment) [Figs. 1 to 8] Figs. 1 to 8 show a first embodiment of the light bulb with a base of the present invention.

In this first embodiment, the present invention is applied to a halogen light bulb 1.

(a Glass bulb) [Figures 1 to 4] 2 is a glass bulb of the halogen 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 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 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 b.

The pinch seal portion 3 has a generally rectangular cross-sectional shape and is generally flat as a whole, and protrusions 8, 8, . . . are formed along both side edges of the wide side surfaces 7, 7. Furthermore, the two wide sides 7, 7
are formed with three projecting surfaces 9, 9, .
...is being formed.

(b Holding band) [Figures 1 to 4] Reference numeral 11 denotes a holding band that holds the glass bulb 2 by winding the pinch seal portion 3 of the glass bulb 2, and the holding band 11 has a spring elastic structure. It is formed by press-forming a single sheet metal material having a

12 is approximately I-shaped as a whole when viewed from the front and back direction,
That is, it is a holding part that is bent so as to have a shape that matches the cross-sectional shape of the pinch seal part 3, and the holding part 12 has two holding pieces 13, 1 facing each other.
4, a connecting piece 15 connecting one end of the holding pieces 13 and 14, a short piece 16 bent at a right angle from the end of one holding piece 13 on the side opposite to the connecting piece 15 and facing the connecting piece 15, and the other holding piece 13. A connecting piece 17 extending from the end of the holding piece 14 on the side opposite to the connecting piece 15 and a connecting piece 18 bent outward from the tip of the short piece 16 at a substantially right angle and facing the connecting piece 17 are integrally formed. Become. The holding pieces 13 and 14 have protruding portions 1 whose intermediate portions in the longitudinal direction are protruded inwardly.
9 and 20 are formed, whereby the holding piece 1
Between 3 and 14, the interval becomes narrower in the middle,
When the coupling pieces 17 and 18 are coupled, the holding pieces 13 and 14, the coupling piece 15, and the short piece 16 form a space that is approximately I-shaped and conforms to the cross-sectional shape of the pinch seal portion 3. Ru.

21, 21, ... are engagement holes formed in the protrusions 19, 20, and these engagement holes 21, 21,
The projections 10, 10, . . . formed on the pinch seal portion 3 of the glass bulb 2 are tightly engaged with the projections 10, 10, . Further, 22 is the connecting piece 1 of the connecting piece 18.
This is a protrusion formed on the surface facing 7.

23 and 24 extend from the rear end edges of the holding pieces 13 and 14 toward opposite sides of each other.
This is a connecting plate integrally formed with 4. Two insertion holes 25, 25, . . . are formed in each of the connection plates 23 and 24, and each insertion hole 2
The opening edges of 5, 25, . . . are raised toward the front and formed into a short cylindrical shape. Further, the outer edges of each of the connecting plates 23 and 24 are slightly bent toward the rear.

The holding band 11 configured as described above is wrapped around the pinch seal portion 3 of the glass bulb 2 in the following manner.

That is, the pinch seal part 3 of the glass bulb 2 is inserted into the space surrounded by the holding pieces 13, 14, the connecting piece 15, and the short piece 16 of the holding part 12, with the holding pieces 13 and 14 slightly expanded. do. This insertion is carried out until the glass bulb 2 abuts the front ends of the protrusions 19, 20, and then the holding pieces 13 and 14 come into contact with the pinch seal part 3. In this state, the protrusion 1
The projections 10, 10, . . . on the projection surfaces 9, 9, . . . formed on the pinch seal portion 3 are engaged with the engagement holes 21, 21, . Then, the connecting pieces 17 and 18 are connected and fixed by spot welding or the like. Incidentally, when spot welding the connecting pieces 17 and 18, the protrusion 22 formed on the connecting piece 18
melts quickly to ensure spot welding.

Thus, the glass bulbs 2 are securely held by the holding band 11 in a correct positional relationship.

(c Mouth Portion) [Figs. 1 to 8] Reference numeral 26 denotes a mouthpiece portion, and the mouthpiece portion 26 is composed of an outer shell portion and a core portion that is fitted and fixed to the front end portion of the outer shell portion.

(c-1 Outer shell part) Reference numeral 27 denotes an outer shell part, which is formed by molding a synthetic resin, and integrally holds the contact piece.

The outer shell portion 27 includes a main portion 28 having a substantially cylindrical shape and a connector portion 29 integrally projecting laterally from the rear end of the main portion 28. The connector portion 29 has a substantially oval cylindrical shape with a small size in the vertical direction, and has a recess 30 that opens laterally.

The main portion 28 is formed with a recess 31 that opens at the front end and reaches almost the rear end, and the front end of the recess 31 is a large diameter portion 32 having an inner diameter larger than the other portion. Further, the rear end portion 33 of the main portion 28 is formed to have a slightly thicker wall thickness than other portions.

A positioning protrusion 34 extending along the axial direction of the main portion 28 is integrally formed on the inner surface of the large diameter portion 32 .

35 is a flange that projects laterally from the outer surface of the main portion 28 near the front end.

(c-2 Contact pieces) 36 and 37 are contact pieces made of a conductive material.

Each of these contact pieces 36 and 37 has an L-shaped side surface, and the vicinity of the bent portion of the L-shape is embedded in the rear end portion 33 of the main portion 28 of the base portion 26 . That is, the main portion 28 and the contact piece 3
6 and 37 are integrally connected by so-called insert molding.

One end portions 36a, 37a of these contact pieces 36, 37 are connected to the recess 3 of the connector portion 29.
0 and is used as a connector piece.

Further, the portions 36b and 37b to which the other ends of the contact pieces 36 and 37 belong are located in the recess 31 of the main portion 28.
extend along its axial direction and their front ends form a recess 3
It is said to be a reed piece that slightly protrudes from the front end of 1.

The portions 36c and 37c embedded in the rear end portion 33 of the main portion 28 are bent into a substantially crank shape when viewed from the front. As a result, when viewed from the front, the lead pieces 36b and 37b are attached to the main portion 2.
8 and extending in the axial direction of the connector portion 29, and are arranged so as to be located on opposite sides of the line.

By arranging the lead pieces 36b, 37b in this manner, they can be arranged near the central axis of the main portion 28, and a relatively large distance can be maintained between them.

(c-3 Core Part) 38 is a core part, which is formed by molding a synthetic resin.

The core portion 38 is shaped like a cylinder having a short length in the axial direction, and the front surface of the cylinder is closed by a front plate 39.

Reference numeral 40 denotes a grooved portion formed on the outer circumferential surface of the cylindrical portion of the core portion 38 along the axial direction.

Slits 41 and 42 are formed in the center of the front plate 39 of the core portion 38, and these slits 41 and 42 have a positional relationship corresponding to the positional relationship of the lead pieces 36b and 37b of the contact pieces 36 and 37. lead pieces 36b, 37b
This is the insertion part for inserting the. Further, the rear end opening edges 41a, 42a of the slits 41, 42 are widened in a chamfered manner to facilitate insertion of the lead pieces 36b, 37b.

(c-4 Holding Part) 43, 43, . . . are support pins serving as a holding part for holding the glass bulb 2 in the cap part 26.

The bases of these support pins 43, 43,...
By so-called insert molding, it is embedded in the front plate 39 of the core part 38 and protrudes forward from the front plate 39. These positions correspond to the positions of the insertion holes 25, 25, . . . formed in the holding band 11.

(c-5 Connection of outer shell portion and core portion) Therefore, the core portion 38 is connected to the main portion 28 of the outer shell portion 27.
The front end of the recess 31 formed in the large diameter portion 3
2.

In addition, before that, the contact pieces 36 and 37 are inserted into the recess 3.
The base of the part protruding into 1, that is, the main part 2
If silicone varnish is applied dropwise to the boundary between the front surface of the rear end 33 and the contact pieces 36, 37, the airtightness between the contact pieces 36, 37 and the outer shell 27 can be maintained well.

The protrusion 34 formed on the large diameter portion 32 is connected to the core portion 38.
By engaging the core part 38 with the large diameter part 32 while engaging with the grooved part 40 formed in the outer shell part 27 and the core part 38,
Lead pieces 36b, 37 of contact pieces 36, 37
b are inserted into the slits 41 and 42 formed in the front plate 39 of the core part 38, and the lead pieces 36b and 37
The front end portion of b is projected forward from the front plate 39 inside the support pins 43, 43, .

In this state, the outer shell part 27 and the core part 38 are integrally joined by ultrasonic welding to form the cap part 26.

Note that the connection between the outer shell part 27 and the core part 38 is not limited to ultrasonic welding, but may be performed by other means, such as adhesion.

When the outer shell part 27 and the core part 38 are coupled in the above manner, a groove 44 extending annularly is formed between the outer peripheral edge of the front plate 39 of the core part 38 and the flange 35 of the outer shell part 27. A suitable sealing material, such as an O-ring 45, is fitted and supported in the groove 44.

(d. Joining the glass bulb and the cap part) The glass bulb 2 is joined to the cap part 26 in the following manner.

That is, first, the support pins 43, 43, . . . provided on the base portion 26 are inserted into the insertion holes 25, 25, . Then, the support pins 43, 43,
... by sliding the flange 35 provided on the cap 26 and the filament 6 sealed in the glass bulb 2.
Once the positional relationship has been adjusted, the connecting plates 23 and 24 of the holding band 11 are attached to the support pins 43, 43, . . . by appropriate welding means such as plasma arc welding. Fix it.

With this, the glass bulb 2 is held by the holding band 11,
It is supported by the base portion 26 via support pins 43, 43, .

The external lead wires 5b, 5b led out from the glass bulb 2 are connected to the front ends of the lead pieces 36b, 37b of the contact pieces 36, 37 by spot welding or the like.

In the manner described above, the glass bulb 2 is coupled to the base portion 26, and the halogen light bulb 1 is formed.

(F-2 Second Example) [Figures 9 to 11] Figures 9 to 11 show the second embodiment of the light bulb with base of the present invention.
Example 1A is shown.

This second embodiment 1A is the same as the above-mentioned first embodiment 1.
The only difference is the holding band and the other points are the same, so only the different parts will be explained in detail and the other parts will not be explained in detail.

Incidentally, the glass bulb for which this holding band is used does not have the protrusions 8, 8, . . . formed on the side edges.

(a Holding band) 46 is a holding band for holding the glass bulb 2 and coupling it to the base, and is formed of a metal plate.

The holding band 46 consists of two parts 47, 47' positioned so as to sandwich the pinch seal part 3 of the glass bulb 2 from both sides. In addition, part 47, 4
Since 7' is formed almost symmetrically, on the other hand, 4
7 will be explained.

The portion 47 includes a band portion 48 that is a portion wrapped around the pinch seal portion 3. The band portion 48 has a main portion 51 formed in a substantially shape when viewed from a plan view, and a long side portion 49 and short side portions 50, 50, which are bent at a substantially right angle outward from the tips of the short side portions 50, 50. It consists of bent joint pieces 52, 52.

53 is a connection plate, and the connection plate 5
3 is formed to be bent laterally at a substantially right angle from the rear end edge of the long side portion 49 of the band portion 48.

The long side portion 50 of the band portion 48 has protrusions 10, 10, 1 provided on the pinch seal portion 3 of the glass bulb 2.
Engagement holes 54, 54, 54 are formed in which 0 is closely engaged, and two insertion holes 55, 55 are formed in the connection plate 53 with an interval between them. The opening edge is slightly raised toward the front and is formed into a short cylindrical shape.

The holding band 46 as described above is attached to the pinch seal portion 3 of the glass bulb 2 in the following manner.

First, each band portion 48, 4 of the portion 47, 47'
8' is positioned along the side surface of the pinch seal portion 3, so that the joining pieces 52, 52 and 52', 52' are brought into close contact with each other. In this way,
Engagement holes 54, 54, 54, 54', 5 formed in the long sides 49, 49' of each band part 48, 48'
4', 54' are engaged with protrusions 10, 10, . . . formed on the pinch seal portion 3.

Therefore, in that state, the connecting pieces 52 and 52' are
Further, the joining pieces 52 and 52' are each integrally joined by spot welding or the like. By this,
The holding band 46 is attached with its band parts 48, 48' wrapped around the pinch seal part 3 of the glass bulb 2.

(b. Connection of the glass bulb and the cap part) To connect the glass bulb 2 to the cap part 26, the support pins 43, 43, ... provided on the cap part 26 are connected to the holding band 46 that holds the glass bulb 2. Through holes 55, 55, formed in plates 53, 53'
55' and 55'. And the insertion hole 55,
Support pins 43, 4 for 55, 55', 55'
3,... to adjust the positional relationship between the flange 35 provided on the mouthpiece 26 and the filament 6 sealed in the glass bulb 2, and when the positional relationship is adjusted, plasma arc welding is performed. The connecting plates 53, 53' of the holding band 46 are fixed to the support pins 43, 43, . . . by suitable welding means such as the like.

With this, the glass bulb 2 is held by the holding band 46,
It is supported by the base portion 26 via support pins 43, 43, .

The external lead wires 5b, 5b led out from the glass bulb 2 are connected to the front ends of the lead pieces 36b, 37b of the contact pieces 36, 37 by spot welding or the like.

The halogen light bulb 1A is formed as described above.

(c Modified example of holding band) [Fig. 12, 13
] Figures 12 and 13 are modification example 4 of the holding band.
6A.

This retaining band 46A has its bands 48,4
Engagement holes 54, 54, 54, 5 formed in 8'
Eyelets 56, 56, 56 on 4', 54', 54',
56'56', 56' are attached. And this eyelet 56, 56, 56, 56'5
6' and 56' are formed of aluminum or copper, for example.

Such eyelets 56, 56, 56, 56',
56', 56' are the engagement holes 54, 54, 54, 54',
By being attached to the glass bulbs 54' and 54', the punched edges of the glass bulbs 2
Since the glass bulb 2 is prevented from coming into contact with the glass bulb 2, cracks, cracks, etc. are less likely to occur on the glass bulb 2.

Incidentally, the eyelet similar to that in this modification is the engagement hole 2 of the holding band 11 in the first embodiment.
Of course, it can also be attached to 1, 21, . . . .

(G Effect of the Invention) As is clear from the above description, the light bulb with a base of the present invention has a holding band wrapped around the pinch seal portion of a glass bulb having a pinch seal portion having a substantially rectangular cross-sectional shape. A light bulb with a cap that connects a glass bulb and a cap via a cap, in which a plurality of protrusions are formed on the side surface of a pinch seal portion of the glass bulb, and a protrusion is formed on the protrusion. It is characterized by engaging with a recess formed in the holding band.

Therefore, according to the present invention, the protrusion of the pinch seal portion and the recess of the holding band engage with each other.
Since the positional relationship between the glass bulb and the holding band is determined accurately, all that is left to do is to align the holding band and the cap to ensure that the positional relationship between the glass bulb and the cap is in the normal state. At the same time, the glass bulb can be easily held securely.
In addition, the pressure due to the wrapping of the holding band is received by a plurality of protruding surfaces, and local concentration of stress is avoided, and the protruding surface where the area receiving the pressure is originally planned is Therefore,
It is possible to prevent the occurrence of cracks and cracks in the glass bulb.

In each of the embodiments described above, all the recesses formed in the holding band are configured as engagement holes, but this makes it easier to form the holding band and improves accuracy. However, it goes without saying that the recess is not a through hole such as an engagement hole, but may be a recess with one side closed.

[Brief explanation of drawings]

1 to 8 show a first embodiment in which a 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 horizontal sectional view, and FIG. Figure 4 is an enlarged sectional view taken along the - line in Figure 2, Figure 4 is an enlarged exploded perspective view of the glass bulb and holding band as seen from the reaction side, Figures 5 to 7 are the cap portion. 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, Figure 8 is a partially cutaway perspective view of the core, and Figures 9 to 11. 9 shows a second embodiment in which the light bulb with base of the present invention is applied to a halogen light bulb; FIG. 9 is a perspective view;
Figure 0 is a sectional view taken along the - line in Figure 9, Figure 11 is an enlarged exploded perspective view showing the glass bulb and the holding band,
12 and 13 show modified examples of the holding band, with FIG. 12 being a perspective view and FIG. 13 being an enlarged sectional view of the main part. Explanation of symbols, 1...Light bulb with base, 2...Glass bulb, 3...Pinch seal portion, 9...Protrusion, 10...
... Protrusion, 11 ... Holding band, 21 ... Recess, 2
6...Cap part, 1A...Light bulb with cap, 2...Glass bulb, 3...Pinch seal part, 9...Protruded surface, 10
... Protrusion, 26 ... Base part, 46 ... Holding band, 54, 54' ... Recess, 46A ... Holding band, 56 ... Recess.

Claims (1)

[Scope of Claims] 1. A light bulb with a cap that connects a glass bulb and a cap via a holding band wrapped around the pinch seal of the glass bulb, which has a pinch seal that is approximately rectangular in cross section. A cap characterized in that a plurality of protrusions are formed on the side surface of the pinch seal portion of the glass bulb, a protrusion is formed on the protrusion, and the protrusion is engaged with a recess formed in the holding band. Comes with a light bulb.