JP6413279B2 - Incandescent bulb for vehicle and method of manufacturing incandescent bulb for vehicle - Google Patents

Description

Embodiments of the present invention, a vehicle incandescent lamps, and a method of manufacturing an incandescent lamp for a vehicle.

A bulb made of soft glass and provided with a sealing portion at the end, a pair of lead portions with one end extending inside the bulb and the other end exposed from the sealing portion, and ends of the pair of lead portions inside the bulb There is an incandescent lamp provided with a filament portion provided between the portions and a fixing member (also referred to as bridge glass) made of soft glass that holds a pair of lead portions inside the bulb.
Here, the sealing portion is formed by heating an end portion of a bulb made of soft glass and crushing the end portion of the heated bulb together with a pair of lead portions.
The fixing member is formed by crushing a member made of heated soft glass together with a pair of lead portions.
For this reason, the pair of lead portions is formed of a dumet wire having a thermal expansion coefficient close to that of glass.
However, when the pair of lead portions are formed of dumet wires, there is a problem that the portion holding the filament portion of the pair of lead portions opens and the failure due to non-conduction occurs as lighting and extinction are repeated.
Therefore, a pair of lead portions has been proposed in which the filament portion side is formed from nickel and the sealing portion side is formed from a dumet wire.
However, consideration has not been given to the positional relationship between the joint portion between the portion formed from nickel and the portion formed from the dumet wire in the pair of lead portions, and the fixing member made of soft glass.
Therefore, when manufacturing an incandescent lamp, there is a possibility that the fixing member is missing and a glass piece is generated inside the bulb.
If there is a glass piece inside the bulb, the glass piece may adhere to the filament portion and breakage may occur.

JP 2009-266725 A Japanese Patent Laid-Open No. 9-45291

Problem to be solved by the invention is providing the incandescent lamp for vehicles which can suppress generation | occurrence | production of the disconnection in a filament part, and the manufacturing method of an incandescent lamp for vehicles .

An incandescent bulb for a vehicle according to an embodiment includes a pair of a bulb; a holding part that includes molybdenum as a main component, and an introduction part that is joined to one end of the holding part and includes a jumet wire. A lead part; a filament part held between ends of the pair of holding parts opposite to the side where the introduction part is joined; soda lime glass, and alkali Including any glass selected from alkaline earth silicate glass, a dimension in a direction in which the introduction part extends is shorter than a dimension in a direction intersecting with a direction in which the introduction part extends , fixing member and for holding the inlet portion; wherein the same glass with the selected glass sealing one end portion of the valve, and a sealing portion for holding said pair of said inlet portion; the It is Bei. A joint portion between the holding portion and the introduction portion is provided between the fixing member and the filament portion.

According to the embodiment of the present invention, it is possible to provide an incandescent bulb for a vehicle that can suppress the occurrence of disconnection in the filament portion, and a method for manufacturing the incandescent bulb for a vehicle .

It is a typical fragmentary sectional view at the time of seeing the incandescent lamp 1 which concerns on this Embodiment from the front side. It is a typical fragmentary sectional view at the time of seeing the incandescent lamp 1 which concerns on this Embodiment from the side surface side.

Hereinafter, embodiments will be illustrated with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1 is a schematic partial cross-sectional view of the incandescent bulb 1 according to the present embodiment as viewed from the front side.
FIG. 2 is a schematic partial cross-sectional view of the incandescent bulb 1 according to the present embodiment as viewed from the side.
The incandescent lamp 1 according to the present embodiment can be used for a brake light, a direction indicator light, a taillight, or the like provided in a vehicle such as a two-wheeled vehicle or a four-wheeled vehicle (automobile).
Moreover, the incandescent light bulb 1 illustrated in FIGS. 1 and 2 is a wedge-based light bulb having no base.
However, the use and form of the incandescent bulb 1 are not limited to those illustrated.
The incandescent bulb 1 according to the present embodiment can be widely applied to a bulb 2 provided with a fixing member 5 made of soft glass that holds a pair of lead portions 6.
For example, the incandescent bulb 1 according to the present embodiment can be used for an illumination device (lamp) used indoors or outdoors, or can be provided with a base.
In this case, it is preferable to use the incandescent bulb 1 according to the present embodiment for a lighting device to which vibration is applied, such as a lighting device for a vehicle.

As shown in FIGS. 1 and 2, the incandescent bulb 1 is provided with a bulb 2, a sealing portion 3, a filament portion 4, a fixing member 5, and a lead portion 6.
The valve 2 is a cylindrical body with one end having a hemispherical shape.
The shape of the valve 2 is not limited to the illustrated ones. For example, the shape is A-type, G-type, PS-type, R-type, T-type, or a combination thereof, or a plate-like body or a dish-like body. It can also be a flat plate shape.
A sealing part 3 is provided at the other end of the valve 2.
The bulb 2 is made of a light transmissive material.
Therefore, the bulb 2 is an airtight container having translucency.

The bulb 2 can be formed of soft glass such as soda lime glass or alkali / alkaline earth silicate glass (also referred to as lead-free glass).
The physical properties of soft glass are, for example, a softening point of 665 ° C., an annealing point of 480 ° C., a strain point of 440 ° C., and a thermal conductivity (100 ° C.) of 1.1 (W / (m · K)), The thermal expansion coefficient (30 ° C. to 380 ° C.) is 5 × 10 ⁻⁶ / ° C. or higher (for example, 9.45 × 10 ⁻⁶ / ° C.).
In this case, the bulb 2 only needs to have translucency. For example, the bulb 2 may be colorless and transparent, or may be colored. Further, the surface and the inner surface of the bulb 2 may be provided with a coating such as a colored film, a reflective film, a diffused film, and a phosphor film, and unevenness. The bulb 2 may be formed of a material including a scattering material or a phosphor.

The inside of the valve 2 that is an airtight container is filled with a vacuum state or an inert gas.
The inert gas to be sealed can be, for example, xenon (Xe) gas, krypton (Kr) gas, argon (Ar) gas, or a mixed gas thereof.
Moreover, the inert gas enclosed can further contain nitrogen (N ₂ ) gas or the like.
When the inert gas is sealed, the pressure inside the valve 2 can be set to about 0.5 MPa to 3.0 MPa.
If an inert gas is enclosed, not only radiation but also heat dissipation by convection can be achieved.
Therefore, even if the power consumption of the incandescent bulb 1 is 15 W (watts) or more, the temperature rise of the incandescent bulb 1 can be suppressed.

The sealing part 3 has a rectangular parallelepiped shape.
As described above, the sealing portion 3 seals one end of the valve 2.
For example, the sealing part 3 can be formed by heating the end part of the valve 2 and crushing the end part of the heated valve 2 together with the pair of introduction parts 6b.
In this case, the sealing part 3 is also formed from soft glass.
The sealing part 3 is provided with an exhaust pipe 3 a that penetrates the inside of the sealing part 3 and communicates with the inside of the valve 2. The exhaust pipe 3 a is used when exhausting the inside of the valve 2 or sealing an inert gas inside the valve 2. The end portion on the outside air side of the exhaust pipe 3a is sealed.
The sealing portion 3 is provided with a convex claw portion 3b used when the incandescent bulb 1 is held on the lamp side.

The filament part 4 has the main-body part 4a and the edge part 4b provided in the both ends of the main-body part 4a, respectively.
The main body 4a has a coil shape.
The main body 4a is formed by winding a wire.
The end 4b has a linear shape and extends in the axial direction of the main body 4a.
The main body 4a and the end 4b can be integrally formed.
The filament part 4 (main body part 4a, end part 4b) can contain tungsten (W) as a main component, for example.

The fixing member 5 is provided inside the valve 2.
The fixing member 5 holds the introduction part 6 b of the pair of lead parts 6.
The fixing member 5 is provided between the joining portion 6c of the holding portion 6a and the introducing portion 6b, and the sealing portion 3.
The fixing member 5 can be formed from soft glass, for example.
The fixing member 5 can be formed, for example, by crushing a member made of heated soft glass together with the pair of introduction portions 6b.
In this case, the valve 2, the sealing portion 3, and the fixing member 5 can be formed from the same material.

The lead part 6 has a holding part 6a and an introduction part 6b.
The holding part 6a is linear.
The cross-sectional dimension (diameter dimension) of the linear holding part 6a can be, for example, 0.3 mm or more and 0.5 mm or less.
One end of the holding portion 6 a is bent and held so as to sandwich the end portion 4 b of the filament portion 4.
The other end of the holding portion 6a is joined to one end of the introduction portion 6b.
As will be described later, the holding portion 6a can include nickel (Ni) or molybdenum (Mo) as a main component.

One end of the introduction part 6 b is joined to the holding part 6 a, and the other end of the introduction part 6 b is exposed from the sealing part 3. The portion exposed from the sealing portion 3 of the introduction portion 6b serves as a terminal for connecting to an external power source or the like.
As will be described later, the introduction portion 6b is formed of a jumet line.

The holding portion 6a and the introduction portion 6b can be joined using, for example, a resistance welding method.
A joint 6 c between the holding part 6 a and the introduction part 6 b is provided between the fixing member 5 and the filament part 4.
That is, the fixing member 5 and the sealing part 3 are sealed with the introduction part 6b, but are not sealed with the holding part 6a.

Here, when the incandescent light bulb 1 is lit, a voltage is applied to the filament portion 4 via the lead portion 6.
When a voltage is applied to the filament part 4, a current flows through the filament part 4 to generate heat and light emission.
Therefore, the holding part 6a holding the end part 4b of the filament part 4 is heated.
In this case, if the holding portion 6a is formed of a dumet wire, there is a possibility that a failure due to non-conduction occurs as follows.

A dumet wire is a composite wire in which an iron / nickel alloy is used as a core and copper is coated thereon. Furthermore, the surface of the jumet wire can be subjected to nickel plating treatment, oxydide finish, borate finish or the like.
Therefore, when the holding portion 6a is formed from a nickel plated dumet wire, the core metal made of iron / nickel alloy of the dumet wire, the copper layer covering the same, and the thermal expansion coefficient of the nickel plating around the copper layer are respectively Because of the difference, the heating accompanying the lighting of the incandescent bulb 1 opens the part (bent part) that holds the end part 4b of the filament part 4 of the holding part 6a so that a failure due to non-conduction occurs. There is a fear.

Therefore, in the present embodiment, the holding portion 6a is formed using nickel or molybdenum.
If the holding part 6a is made of nickel or molybdenum, the holding part 6a is made of a single metal, so that the filament part of the holding part 6a is more than a jumet wire made of a plurality of metals having different thermal expansion coefficients. It is possible to suppress a phenomenon in which a portion (folded portion) that is held so as to sandwich the end portion 4b of 4 is opened. As a result, the occurrence of a failure due to the non-conduction of the filament part 4 can be suppressed.

However, the thermal expansion coefficient of nickel is about 13.3 × 10 ⁻⁶ / ° C., and the thermal expansion coefficient of molybdenum is about 4.9 × 10 ⁻⁶ / ° C.
On the other hand, the thermal expansion coefficient of the soft glass which is the material of the sealing part 3 and the fixing member 5 is about 9.45 × 10 ⁻⁶ / ° C.

Therefore, the difference between the thermal expansion coefficient of nickel or molybdenum and the thermal expansion coefficient of soft glass is increased. Therefore, when the entire lead part 6 is made of nickel or molybdenum, the lead part 6 and the sealing part 3 are sealed. In addition, there is a possibility that the sealing between the lead portion 6 and the fixing member 5 is incomplete.
If the sealing between the lead part 6 and the sealing part 3 is incomplete, there is a possibility that leakage occurs in the sealing part 3.
If the lead part 6 and the fixing member 5 are not completely sealed, the fixing member 5 is likely to be chipped when the incandescent lamp 1 is manufactured. If the fixing member 5 is missing, a glass piece is generated inside the bulb 2, and the glass piece may adhere to the filament portion 4 and breakage may occur.

Here, the thermal expansion coefficient of the dumet wire is about 9.3 × 10 ⁻⁶ / ° C., and the difference from the thermal expansion coefficient of the soft glass is small.
Therefore, if the sealing part 3 and the introduction part 6b to be sealed with the fixing member 5 are formed of a dumet wire, it is possible to suppress incomplete sealing.
As a result, it is possible to suppress the occurrence of leakage in the sealing portion 3.
In addition, when the incandescent lamp 1 is manufactured, it is possible to suppress the generation of a glass piece inside the bulb 2, and thus it is possible to suppress the occurrence of disconnection in the filament portion 4.

なお、ガラス片の発生確率は、白熱電球１を製造する際のものである。
表１から分かるように、保持部６ａと導入部６ｂの接合部６ｃが、固定部材５とフィラメント部４との間に設けられていれば、バルブ２の内部にガラス片が生じるのを抑制することができる。
そのため、フィラメント部４にガラス片が付着して断線が発生するのを抑制することができる。 Table 1 is a table for illustrating the effect of the incandescent lamp 1 according to the present embodiment.

In addition, the generation probability of a glass piece is a thing at the time of manufacturing the incandescent lamp 1.
As can be seen from Table 1, if the joining portion 6c of the holding portion 6a and the introducing portion 6b is provided between the fixing member 5 and the filament portion 4, it is possible to suppress the generation of a glass piece inside the bulb 2. be able to.
Therefore, it can suppress that a glass piece adheres to the filament part 4, and a disconnection generate | occur | produces.

Next, the manufacturing method of the incandescent lamp 1 will be illustrated.
First, the fixing member 5 is formed by holding the filament portion 4 on the holding portion 6 a of the pair of lead portions 6 and crushing a member made of heated soft glass together with the introduction portion 6 b of the pair of lead portions 6.
Next, the filament part 4 and the fixing member 5 are inserted into the cylindrical soft glass tube.
At this time, the introduction part 6b is led out to the outside of the soft glass tube.
Further, the exhaust pipe 3a made of soft glass is disposed in the opening portion on the side where the introduction portion 6b of the soft glass tube is led out.
Next, both ends of the soft glass tube are heated with a gas burner and sandwiched between a pair of pinchers, thereby forming a bulb 2 whose one end is sealed in a hemispherical shape. Further, the sealing portion 3 is formed at the other end of the valve 2.
From the formed sealing portion 3, a pair of introduction portions 6b extends outward.
Next, the inside of the valve 2 is exhausted through the exhaust pipe 3a, and an inert gas is supplied to the inside of the valve 2 as necessary.
Next, the exhaust pipe 3a is burned out by a burner, and the valve 2 and the exhaust pipe 3a are annealed.
Next, the pair of introduction portions 6b extending outward from the sealing portion 3 is bent to form terminals.
As described above, the incandescent bulb 1 can be manufactured.

  As mentioned above, although several embodiment of this invention was illustrated, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and equivalents thereof. Further, the above-described embodiments can be implemented in combination with each other.

  1 incandescent bulb, 2 bulb, 3 sealing part, 4 filament part, 4a body part, 4b end part, 5 fixing member, 6 lead part, 6a holding part, 6b introducing part, 6c joining part

Claims (3)

With a valve;
A pair of lead portions each having a holding portion containing molybdenum as a main component and an introduction portion joined to one end portion of the holding portion and made of a dumet wire;
Inside the bulb, a filament part held between ends of the pair of holding parts opposite to the side where the introduction part is joined;
Including any glass selected from soda lime glass and alkali / alkaline earth silicate glass , the dimension in the direction in which the introduction part extends is shorter than the dimension in the direction intersecting the direction in which the introduction part extends, A fixing member for holding the pair of introduction portions inside the valve;
A sealing portion that includes the same glass as the selected glass, seals one end of the bulb, and holds the pair of introduction portions;
Comprising
The junction part of the said holding | maintenance part and the said introducing | transducing part is an incandescent bulb for vehicles provided between the said fixing member and the said filament part. Inside of the valve, the vehicular light source device according to claim 1, wherein the inert gas is sealed. A method for producing an incandescent bulb for a vehicle according to claim 1 or 2 ,
Joining the holding part and the introduction part by resistance welding ;
Heating a member containing any one of soda lime glass and alkali / alkaline earth silicate glass, and crushing the heated member together with a pair of the introduction portions, the introduction portion becomes Forming a fixing member having a dimension in an extending direction shorter than a dimension in a direction intersecting with a direction in which the introduction portion extends;
Heating a tube containing the same glass as the selected glass and crushing the heated tube together with the pair of introduction portions provided inside the tube; and forming a sealing portion;
The manufacturing method of the incandescent lamp for vehicles which comprised this .

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