JPH0557701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The light bulb with base for automobiles of the present invention will be explained according to the following items.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Example [Figs. 1 to 8] a. Glass bulb [Fig. 1] [Figs. 1 to 4] b Holding band [Figs. 1 to 4] c Mouth part [Figs. 1 to 8] c-1 Outer shell c-2 Contact piece c-3 Core part c-4 Holding part c-5 Connection between the outer shell and the core d Connection between the glass bulb and the cap G Effects of the invention (A. Field of industrial application) The present invention relates to a novel light bulb with a cap for an automobile.
Specifically, in a type of automobile lamp with a cap that connects the glass bulb and the cap via a holding band wrapped around the pinch seal of the glass bulb, the positional relationship between the glass bulb and the holding band is made accurate and the holding band is held. An object of the present invention is to provide a novel light bulb with a base for automobiles in which a glass bulb is securely held by a band.

(B Summary of the Invention) The present invention provides a light bulb with a base for an automobile, which has a substantially rectangular cross-sectional shape and is generally flat as a whole. A light bulb with a cap for an automobile that connects a glass bulb and a cap via a retaining band wrapped around a pinch seal of a glass bulb having a seal, the bulb having a seal on both sides of the pinch seal of the glass bulb. Protrusions having different shapes are formed on the surfaces thereof, and recesses of a size such that the projections having different shapes are closely engaged are formed on two opposite sides of the holding band, and the glass bulb and the cap part are formed. When connecting the glass bulb and the holding band via the holding band, the protrusions of the pinch seal part engage with the recessed parts of the holding band, thereby making the positional relationship between the glass bulb and the holding band accurate, and also ensuring that the holding band This ensures that the glass bulb is held securely.

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

(D Problem to be Solved by the Invention) In other words, in the case of a light bulb with a base used for automobiles, the base is usually equipped with a positioning means for the lamp, and the positioning means must be used. This allows the film enclosed within the glass bulb to be positioned at a proper position within the lamp.

However, in the case of a type of automotive lamp with a cap that connects the glass bulb to the cap via a retaining band wrapped around the pinch seal, if the glass bulb and the retaining band are not coupled in the correct relationship, This causes an inconvenience in that the positional relationship between the positioning means provided in the cap and the filament sealed in the glass bulb becomes out of order. In particular, this disadvantage becomes noticeable when the glass bulb is connected in an inclined state with respect to the holding band.

Furthermore, if the bond between the glass bulb and the holding band is unstable, there is a problem that the glass bulb may even fall off due to vibrations during running.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the present invention has a light bulb with a base for an automobile, which has a substantially rectangular cross-sectional shape and a substantially flat shape as a whole. A light bulb for an automobile with a base, which connects a glass bulb and a base through a holding band wrapped around the pinch seal part of a glass bulb having a pinch seal part with protrusions formed along both side edges of the side surface. Protrusions having different shapes are formed on both wide sides of the pinch seal portion of the glass bulb, and the protrusions having different shapes are tightly engaged with two opposing sides of the holding band. A concave portion of the same size is formed, and when the glass bulb and the cap portion are connected via a holding band, the protrusions of the pinch seal portion are respectively engaged with the concave portions of the holding band.

Therefore, according to the present invention, the protrusions of mutually different shapes formed on both wide side surfaces of the pinch seal portion and the recesses formed on the two opposite sides of the retaining band closely engage with each other. By doing this, the positional relationship between the glass bulb and the holding band can be determined accurately, so all that is left to do is to align the holding band and the cap, and then the positional relationship between the glass bulb and the cap can be determined. It is possible to easily maintain the glass bulb in its normal state and to securely hold the glass bulb.

(F Embodiment) [FIGS. 1 to 8] Details of the present invention will be described below with reference to illustrated embodiments.

1 to 8 show a first embodiment of a light bulb with a cap according to 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 are lead wires, the middle portion of which is held in the pinch seal portion 3 so as to pass through it in the axial direction, and the portions 5a, 5b inside the glass bulb 2 are used as internal lead wires; Portions 5b, 5b led out from the pinch seal portion 3 are used as external lead wires. A filament 6 is stretched between the tips of the internal lead wires 5a, 5a.

The pinch seal portion 3 has a substantially rectangular cross-sectional shape and is generally flat as a whole, and protrusions 7, 7, . . . are formed along both side edges of its wide side surface. Furthermore, a slightly larger protrusion 8 is formed approximately in the center of one of the wide side surfaces;
Furthermore, two small protrusions 9, 9 are formed at locations slightly laterally from the center of the other wide side surface.

(b Holding band) [Figs. 1 to 4] Reference numeral 10 denotes a holding band for holding the glass bulb 2 and connecting it to a cap portion to be described later, and is formed of a metal plate.

The holding band 10 has a holding part 11 in the form of a metal band.
and the connecting plates 12, 13, 13 are integrally formed.

The holding part 11 is the pinch seal part 3 of the glass bulb 2
Long side part 1
4, 15 and short sides 16, 16 which connect these long sides 14, 15 at their ends, and one of the long sides 14, 15, 15, is divided at the center into two. It is composed of long side halves 17, 17, and connecting sides 18, 18 bent outward are formed at the ends where the long side halves 17, 17 meet. A protrusion 19 is formed on one of the connecting sides 18, 18 in a protruding shape that protrudes toward the other side.

The portion 14a of the long side 14 excluding both ends is slightly protruded toward the other long side 15, and the short side 16 of the long side half 17,
Parts 117a, 17a excluding the part near 16
are slightly protruded toward the long side portion 14.
Thus, when the connecting pieces 18 and 18 are connected, the protrusions 7 of the pinch seal portion 3 of the glass bulb 2 are formed at both ends in the longitudinal direction of the space surrounded by the sides 14, 15, 16, and 16. , 7, ... is formed.

Reference numeral 20 denotes an engagement hole formed in the center of the protrusion 14a of the long side portion 14, and is sized to tightly engage with the protrusion 8 provided on the pinch seal portion 3. 21, 21 are long side half parts 17, 17
This is an engagement hole formed in the protrusions 17a, 17a, and is sized so that the protrusions 9, 9 of the pinch seal part 3 are tightly engaged with each other.

22 is a bent piece protruding outward from the front edge of the protrusion 14a of the long side portion 14; 23, 23 is a bent piece protruding outward from the front edge of the protrusion 17a of the long side half portions 17 It is a bent piece that protrudes towards the end.

Then, the holding part 11 is wrapped around the pinch seal part 3 of the glass bulb 2, and in this state, the connecting piece 1
8 and 18 are joined together by spot welding or the like.
At this time, the protrusion 1 provided on one of the connecting pieces 18
9 is useful for welding. In this way, the holding part 11 is fixed to the pinch seal part 3.

At this time, the protrusion 8 provided on the pinch seal portion 3 is inserted into the engagement hole 20 formed on the long piece portion 14.
Further, the protrusions 9, 9 engage with the engagement holes 21, 21 formed in the long side half parts 17, 17, respectively,
Thereby, the positional relationship between the glass bulb 2 and the holding band 10 is maintained correctly, and the holding of the glass bulb 2 by the holding band 10 is ensured.

The connecting plates 12 and 13, 13 are located at the rear end edges of the long sides 14, 15 of the holding part 11, that is,
It is provided along the edge on the opposite side to the side where the glass bulb 2 is located.

The connecting plate 12 has a protrusion 14 on the long side 14.
It is formed by being bent at a substantially right angle from the rear end edge of the other connecting plate 13, 13.
are the protruding parts 17a, 17a of the long side half parts 17, 17
It is bent outward from the rear end edge at a substantially right angle.

There are two pieces spaced apart on the connecting plate 12, and one piece on each of the connecting plates 13 and 13.
The opening edge of each insertion hole 24, 24... is slightly raised toward the front, and is formed into a short cylindrical shape.

(c Mouth Portion) [Figs. 1 to 8] Reference numeral 25 denotes a mouthpiece portion, and the mouthpiece portion 25 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) 26 is an outer shell part, which is formed by molding a synthetic resin, and integrally holds the contact piece.

The outer shell 26 consists of a main part 27 having a substantially cylindrical shape and a connector part 28 integrally projecting laterally from the rear end of the main part 27. The connector portion 28 has a substantially oval cylindrical shape with a small size in the vertical direction, and has a recess 29 that opens laterally.

The main portion 27 is formed with a recess 30 that opens at the front end and reaches almost the rear end.
The front end portion is formed into a large diameter portion 31 whose inner diameter is larger than that of the other portions. Further, the rear end portion 32 of the main portion 27 is formed to have a slightly thicker wall thickness than other portions.

A positioning protrusion 33 extending along the axial direction of the main portion 27 is integrally formed on the inner surface of the large diameter portion 31 .

A flange 34 projects laterally from the outer surface of the main portion 27 near the front end.

(c-2 Contact Pieces) 35 and 36 are contact pieces made of a conductive material.

Each of these contact pieces 35 and 36 has an L-shaped side surface, and the vicinity of the bent portion of the L-shape is embedded in the rear end portion 32 of the main portion 27 of the base portion 25 . That is, the main part 27 and the contact side 3
5 and 36 are integrally connected by so-called insert molding.

One end portions 35a, 36a of these contact pieces 35, 36 are projected into the recess 29 of the connector portion 28 to form a connector piece.

Further, the portions 35b and 36b to which the other ends of the contact pieces 35 and 36 belong are located in the recess 30 of the main portion 27.
extend along its axial direction and their front ends form a recess 3
It is a lead piece that slightly protrudes from the front end of the 0.
The portions 35c and 36c embedded in the rear end portion 32 of the main portion 27 are bent into a substantially crank shape when viewed from the front. As a result, when viewed from the front, the lead pieces 35b and 36b are attached to the main portion 27.
They are arranged substantially along a line that intersects with the central axis of the connector section 28 and extends in the axial direction of the connector section 28, and are located on opposite sides of the line.

By arranging the lead pieces 35b and 36b in this manner, they can be arranged near the central axis of the portion 27, and a relatively large distance can be maintained between them.

(c-3 Core Part) 37 is a core part, which is formed by molding a synthetic resin.

The core portion 37 is shaped like a cylinder having a short axial length, with the front surface of the cylinder being closed by a front plate 38.

Reference numeral 39 denotes a grooved portion formed on the outer circumferential surface of the cylindrical portion of the core portion 37 along the axial direction.

Slits 40 and 41 are formed in the center of the front plate 38 of the core part 37.
These slits 40 and 41 form the contact piece 3.
The lead pieces 35b and 36b are formed in a positional relationship corresponding to the positional relationship between the lead pieces 35b and 36b, and serve as insertion portions for inserting the lead pieces 35b and 36b. Also, slits 40, 41
The rear opening edges 40a, 41a are widened in a chamfered manner to facilitate insertion of the lead pieces 35b, 36b.

Note that 42 is a welding rib formed on the rear end surface of the cylindrical portion.

(c-4 holding part) 43, 43, ... is a glass bulb 2 in the cap part 25.
This is a support pin that serves as a holding part for holding the. The bases of these support pins 43, 43, . . . are embedded in the front plate 38 of the core part 37 by so-called insert molding.
8 and protrudes forward. These positions correspond to the positions of the insertion holes 24, 24, . . . formed in the holding band 10.

(c-5 Coupling of the outer shell part and the core part) Therefore, the core part 37 is located at the front end of the recess 30 formed in the main part 27 of the outer shell part 26, that is,
It is fitted into the large diameter portion 31.

Before that, silicone varnish is applied dropwise to the base of the part where the contact pieces 35, 36 protrude into the recess 30, that is, to the boundary between the front surface of the rear end 32 of the main part 27 and the contact pieces 35, 36. If you do so, the contact piece 35, 3
6 and the outer shell 26 is well maintained.

If the core part 37 is engaged with the large diameter part 31 while the protrusion 33 formed on the large diameter part 31 is engaged with the grooved part 39 formed in the core part 37, the outer shell part 26 and The lead pieces 35b, 36b of the contact pieces 35, 36 are inserted into the slits 40, 41 formed in the front plate 38 of the core part 37, and the front ends of the lead pieces 35b, 36b are positioned with respect to the core part 37. The front plate 38 is inside the support pins 43, 43,...
It is forced to protrude forward.

In this state, the outer shell part 26 and the core part 37 are integrally joined by ultrasonic welding, and the cap part 25
is formed. At this time, the welding rib 4
2 is melted and welded to the bottom surface of the large diameter portion 31.

Note that the connection between the outer shell portion 26 and the core portion 37 is not limited to ultrasonic welding, but may also be performed by other means, such as
Adhesion may also be used. If adhesive is used, the welding rib 42 is not necessary.

When the outer shell portion 26 and the core portion 37 are combined as described above, the front plate 38 of the core portion 37
An annularly extending groove 44 is formed between the peripheral edge of the outer shell 26 and the flange 34 of the outer shell 26, and 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 25 in the following manner.

That is, first, the support pins 43, 43, .
It is inserted into the insertion holes 24, 24, . . .

Then, by sliding the support pins 43, 43, ... into the insertion holes 24, 24, ..., the base portion 25
The positional relationship between the flange 34 provided in the glass bulb 2 and the filament 6 sealed in the glass bulb 2 is adjusted, and once the positional relationship is adjusted, the holding band is attached by an appropriate welding method such as plasma arc welding. 10 connecting plates 12 and 13,1
3 is fixed to support pins 43, 43, .

With this, the glass bulb 2 is held by the holding band 1.
0, the base part 2 via the support pins 43, 43,...
Supported by 5.

The external lead wires 5a, 5b led out from the glass bulb 2 are connected to the front ends of the lead pieces 35b, 36b of the contact pieces 35, 36 by spot welding or the like. In this case, the lead wire 5,
If 5 is made of molybdenum with a diameter of 0.35 mm, spot weldability will not be good.
It is preferable to fold the nickel ribbons 46, 46 of about 0.15 mm in half and attach them to the external lead wires 5b, 5b, and spot weld the nickel ribbons 46, 46 together.

In the above manner, the glass bulb 2 is attached to the base portion 25.
are combined to form the halogen light bulb 1.

(G. Effects of the Invention) As is clear from the above description, the light bulb with a base for an automobile of the present invention has a substantially rectangular cross-sectional shape and a substantially flat shape as a whole. A light bulb with a cap for an automobile, which connects a glass bulb and a cap part through a holding band wrapped around the pinch seal part of a glass bulb having a pinch seal part with protrusions formed along the edge. , protrusions of different shapes are formed on both wide sides of the pinch seal portion of the glass bulb, and the protrusions of different shapes are formed on two opposite sides of the holding band of a size such that the protrusions of different shapes closely engage with each other. The present invention is characterized in that recesses are formed in each case, and the protrusions of the pinch seal part are respectively engaged with the recesses of the holding band when the glass bulb and the cap are connected via the holding band.

Therefore, according to the present invention, the protrusions of different shapes formed on both wide side surfaces of the pinch seal portion and the recesses formed on the two opposite sides of the holding band closely engage with each other. As a result, the positional relationship between the glass bulb and the holding band can be determined accurately, so all that is left to do is to align the holding band and the cap, and then the positional relationship between the glass bulb and the cap will be determined. The glass bulb can be brought into its normal state and the glass bulb can be easily held securely.

In the above-described embodiment, the recess formed in the holding band is configured as an engagement hole, but it is easier to form the holding band in this way, and
Accuracy is also improved. 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 the drawing]

FIGS. 1 to 8 show an embodiment in which the present invention is applied to a halogen light bulb with a base for automobiles.
Figure 1 is an exploded perspective view, Figure 2 is a perspective view, Figure 3 is a sectional view taken along the - line in Figure 2, and Figure 4 is a view of the glass bulb and retaining band from the opposite side from Figure 1. FIGS. 5 to 7 are enlarged exploded perspective views of the cap, with FIG. 5 being a front view, FIG. 6 being a rear view, and FIG. 7 being a view in the direction of the arrow in FIG. FIG. 8 is a partially cutaway perspective view of the core portion. Explanation of symbols, 1...Light bulb with a base for automobiles, 2...
... Glass bulb, 3 ... Pinch seal part, 7 ... Protrusion, 8 ... Protrusion, 9 ... Protrusion, 10 ... Holding band, 20 ... Recess, 21 ... Recess, 25 ... Cap part .

Claims (1)

[Scope of Claims] 1. A pinch of glass bulb that has a generally rectangular cross-sectional shape, is generally flat as a whole, and has a pinch seal portion in which protrusions are formed along both edges of its wide side surface. A light bulb for an automobile with a cap that connects a glass bulb and a cap via a retaining band wrapped around the seal, wherein protrusions with different shapes are provided on both wide sides of the pinch seal of the glass bulb. forming recesses on two opposite sides of the holding band, each having a size such that the protrusions having different shapes are closely engaged with each other, and connecting the glass bulb and the cap through the holding band. A light bulb with a base for an automobile, characterized in that the protrusions of the pinch seal part are respectively engaged with the concave parts of the holding band when the light bulb is removed.