JP2003272566A - Bulb for vehicular signal light and method of producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a color loss area of a tubular bulb inside the area covered by a base. <P>SOLUTION: The base 5 is mounted as covering the base end part of a straight pipe part 7, an exhaust pipe 9, and a tubular bulb main unit 6. The exhaust pipe 9 is extended by nearing a sealed end 9a to the outer surface of the base 5, a stem main unit 8 is formed by having an extended base end part 8a which makes the sealed end 9a protrude, the straight pipe part 7 forms an extended straight pipe 7a by extending an opening end 7b, and the extended straight pipe part 7a is welded to the extended base end part 8a of the stem main unit 8. The welding area M between a tubular bulb part 2 and a stem part 4 is placed between each extended straight pipe part 7a and the extended base end part 8a, they are away from the tubular bulb main unit 6 so that the area A of color loss caused by electric heat upon welding can be kept in the area covered by the base 5. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle signal light bulb and a method for manufacturing the same, which are applied to lamps intended for vehicle signal signs, such as tail lamps, stop lamps, and parking lamps.

[0002]

2. Description of the Related Art Emission colors of vehicle signal lights differ depending on their purposes, and the emission colors are standardized by JIS. For this reason, as the vehicle signal light bulb, when the lens body constituting the lamp is transparent, the light bulb itself is colored. Conventionally, as such a vehicle signal light bulb, there is an S25 glass ball with a BA15s base or an S25 glass ball with a BAY15d base.

The color of the light emitted at this time is, for example, red or amber, and each light bulb is constructed by coating its bulb with a corresponding color, or using a colored cloth glass colored with the corresponding color. It is configured by molding the tube portion itself.

In the latter case, for example, a red light emitting vehicle signal light bulb 100 is constructed by molding the bulb portion 2 using a colored cloth glass typified by copper red glass as shown in FIG. There is.

[0005]

However, in the case of a vehicle signal light bulb formed by painting, the number of steps increases due to the addition of painting steps, which not only increases cost but also causes peeling and fading. It has a problem that it is inferior in durability and weather resistance.

Further, the vehicle signal light bulb 100 made of colored fabric glass is a bulb in which the stem portion 4 having the filament 3 mounted thereon and the bulb portion 2 are welded (welded portion M) in the manufacturing process of the bulb. In the sealing step, heat transfer during welding may cause color loss in the tube portion 2 (the range of color loss is indicated by A in FIG. 3), and this range of color loss is covered by the base 5. In the case where it occurs beyond the range (in FIG. 3, the color loss exposed portion A1 is shown by hatching), there is a problem that light outside the standard of the chromaticity range leaks.

Therefore, according to the present invention, the range of color loss of the bulb portion formed of the colored glass material is covered with the die without causing the high cost, the deterioration of the durability and the weather resistance due to the coating structure. It is an object of the present invention to provide a vehicle signal light bulb and a method for manufacturing the same, which can be kept within a specified range and can prevent leakage of light that falls outside the standard of the chromaticity range.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is such that the tube portion is opened at the tube body portion which becomes the light emitting portion and at the base end side of the tube body portion. And a straight tube portion provided as a colored glass material, and the stem portion includes a stem body portion having a filament attached thereto and an exhaust pipe provided so as to project toward the base end side of the stem body portion. Is formed by being inserted into the inside of the bulb main body from the straight pipe portion, and is attached by welding the base end side portion of the stem main body portion to the open end of the straight pipe portion, and the base is A straight bulb portion, the exhaust pipe, and a vehicle signal light bulb mounted so as to cover a proximal end portion of the bulb main body portion, wherein the exhaust pipe has a sealing end inside the base. It is extended asymptotically to the outer surface of the mouthpiece, the stem body, The end side is extended along the exhaust pipe and is formed to have an extended base end portion that projects the sealing end, and the straight pipe portion extends the open end side. The extended straight pipe portion is formed by welding, and the open end portion of the extended straight pipe portion is welded to the extended base end portion of the stem body portion.

Therefore, in the invention of claim 1, without changing the size of the tube body, the position of the filament in the tube body, the size of the mouthpiece, and the installation position of the mouthpiece with respect to the tube body, Within the range of the inside of the base, the exhaust pipe extends its sealed end side, and the stem body extends its proximal end side.
In addition, the straight pipe portion is formed by extending the open end side thereof.

Since the welded portion of the bulb portion and the stem portion is located between the extended straight pipe portion and the extended base end portion, respectively, it is moved away from the bulb main body portion, which results in welding. The range of color loss due to heat transfer at the time of can be kept within the range covered by the base.

The invention according to claim 2 is the method for manufacturing a vehicle signal light bulb according to claim 1, wherein the stem main body portion having the extended base end portion is provided with the extended base end portion. A stem forming step of welding the protruding exhaust pipe to form the stem portion, and providing the straight pipe portion having the extended straight pipe portion on the base end side of the bulb main body to form the bulb portion. A tube forming step of forming, and inserting the stem portion into the inside of the tube main body portion from the opening end of the extended straight pipe portion, and the extending base end portion of the stem main body portion by the extended straight pipe. Tube sealing step of welding to the open end portion of the part, and after the tube sealing step,
A gas replacement step of replacing the gas in the bulb portion with an inert gas through the exhaust pipe, and after the gas replacement step, the end portion of the exhaust pipe is melted to extend the base end portion of the stem body portion. An exhaust pipe sealing step of forming a sealing end projecting from the exhaust pipe, and after the exhaust pipe sealing step, the sealing end, the straight pipe portion, and the base end side portion of the tube body portion are covered to cover the exhaust pipe. And a base mounting step of mounting the base.

Therefore, according to the second aspect of the invention, in the tube sealing step, the heat is transferred when the extending base end portion is welded to the opening end portion of the extending straight pipe portion. Color loss occurs in the peripheral bulb portion, but since the welded portion is an extended portion, it will be moved away from the bulb main body portion by the extended portion, and thus the range of color loss can be reduced. It can be kept within the range covered by the base.

In the base mounting step, the range of the color loss can be covered with the base by mounting the base.

The invention according to claim 3 is the method for manufacturing a vehicle signal light bulb according to claim 2, wherein in the exhaust pipe sealing step, melt sealing of an end portion of the exhaust pipe is performed. It is characterized in that the welded portion of the extended straight pipe portion is formed under the protection of the heat cutoff means.

Therefore, in the third aspect of the invention, the heating means at the time of melting and sealing the end portion of the exhaust pipe is not blocked by the heating shut-off means and does not directly heat the welded portion of the extended straight pipe portion. Therefore, remelting of the welded portion of the extended straight pipe portion due to heating at the time of forming the sealed end of the exhaust pipe can be reliably prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below based on the embodiments. It should be noted that members having the same functions as the members shown in FIG.

FIG. 1 shows a vehicle signal light bulb 1 as an embodiment of the present invention. This light bulb 1 has a tube portion 2 which has a tube body portion 6 serving as a light emitting portion and a straight tube portion 7 which is provided on the base end side of the tube body portion 6 and which is opened and is made of a colored glass material. The stem portion 4 is formed by including a stem body portion 8 having the filament 3 mounted thereon and an exhaust pipe 9 projecting toward the base end side of the stem body portion 8 The stem body 8 is inserted into the inside of the body portion 6 and the base end side portion of the stem body portion 8 is attached to the opening end of the straight pipe portion 7 by welding, and the base 5 is attached to the straight pipe portion 7 and the exhaust pipe 9. , And the base end portion of the tube body 6 are mounted to cover the entire body.

In the present embodiment, copper red glass is used as the colored material glass, and the exhaust pipe 9 extends with its sealing end 9a inside the base 5 and asymptotically approaching the outer surface of the base 5. The stem body 8 is formed to have a base end side extending along the exhaust pipe 9 and an extending base end 8a projecting the sealing end 9a.

Further, the straight pipe portion 7 extends the open end side thereof to form an extended straight pipe portion 7a, and the open end portion of the extended straight pipe portion 7a extends from the stem body portion 8. The base end portion 8a is welded (welded portion M).

At this time, the extension amounts of the extension straight pipe portion 7a and the extension base end portion 8a are the same, and BA1 is added to the S25 glass ball.
BA with 5s base or S25 glass ball
It has a Y15d base and is about 5 mm.

In the light bulb 1 thus constructed, the size of the tube body 6, the position of the filament 3 in the tube body 6, the size of the base 5, and the size of the base 5 with respect to the body 6 of the bulb. Without changing the installation position, the exhaust pipe 9 extends its sealing end 9a side, the stem body 8 extends its proximal end side, and the straight pipe part within the range of the base 5. Since 7 is formed by extending the open end side thereof, other conventional lamp accessory parts such as a lamp housing and a reflector can be used as they are.

In the light bulb 1, the bulb portion 2 and the stem portion 4
Since the welded portion M of and is between the respective extended straight pipe portions 7a and the extended base end portions 8a, it is moved away from the tube main body portion 6, which causes heat transfer during welding. It is possible to keep the color loss range A within the range covered by the base 5. In short, the range A of the color loss is the range from the opening end of the extended straight pipe portion 7a of the tube portion 2 to the portion corresponding to the proximity not exceeding the end edge portion 5a of the base 5.

Next, a method of manufacturing the light bulb 1 will be described with reference to FIG.

In this manufacturing method, the stem body 8 having the extended base end portion 8a is welded with the exhaust pipe 9 protruding from the extended base end portion 8a to form the stem portion 4a.
And a tube forming step c for forming the tube part 2 by providing the straight tube part 7 having the extended straight tube part 7a on the base end side of the tube body part 6.
While inserting the stem portion 4 into the interior of the bulb main body portion 6 from the opening end 7b of the extended straight pipe portion 7a (see the bulb molding step c),
A tube sealing step d in which the extended base end portion 8a of the stem body portion 8 is welded to the open end portion of the extended straight pipe portion 7a, and after the tube sealing step d, a pipe is provided via an exhaust pipe 9. A gas replacement step d1 for replacing the gas in the ball portion 2 with an inert gas G, and a gas replacement step d
After the exhaust pipe sealing step e in which the end portion of the exhaust pipe 9 is melted to form the sealing end 9a protruding from the extended base end portion 8a of the stem body portion 8, and the exhaust pipe sealing step e , The sealing end 9a, the straight pipe portion 7, and the base end side portion of the tube body portion 6 to cover the base 5
And a base mounting step for mounting.

Specifically, in the stem portion 4, the introduction wire 10 is assembled to the stem body portion 8 in the stem forming step a, and the filament 3 is mounted between the introduction wires 10 and 10 in the mount forming step b of the next step. With getter coating 11
Is formed. The getter coating 11 at this time is performed in order to secure the life of the filament 3 by adsorbing the oxidizing gas in the tube portion 2. For example, barium nitride is coated on the stem body portion 8. By.

The tube portion 2 is made of copper red glass in the tube forming step c and has a tube body portion 6 of a conventional size.
The straight tube portion 7 having the straight tube portion 7a is formed on the base end side (small diameter side) of the tube body 6 so as to extend. That is, in the tube portion 2, only the straight pipe portion 7 has the extended straight pipe portion 7a and is extended. The extension amount at this time is determined as a length (about 5 mm) that is within the coating range of the die 5 and exceeds the width of the color loss exposed portion (see color loss exposed portion A1 in FIG. 3) of the prior art. The extended base end portion 8a of the stem body portion 8 is formed with the same extension amount as the extended straight pipe portion 7a.

In the tube sealing step d, the outer peripheral surface of the base end flange portion 8b of the extended base end portion 8a of the stem body 8 is extended from the inside to the open end portion of the straight pipe portion 7a. In a state of being brought into contact with the base end flange portion 8b and the extended straight pipe portion 7 by rotating the contact portion while applying a sealing burner to the contact portion.
The open end portion of a is welded M. Color loss occurs in the tube portion 2 due to heat transfer during the welding, but the range A of the color loss
Can be kept within the range covered by the base 5 by forming the extended straight pipe portion 7a and the extended base end portion 8a.

In the next gas replacement step d1, the inert gas G is filled into the bulb portion 2 through the exhaust pipe 9. The inert gas G at this time is, for example, 95% argon gas and nitrogen gas. A 5% gas mixture is used.

In addition, in the exhaust pipe sealing step e, in order to make the exhaust pipe 9 which is installed a long length into the base 5,
The excess portion is melted and removed, and at the same time, the end portion of the exhaust pipe 9 is melted to form the sealing end 9a in order to prevent the inert gas G from leaking inside the bulb portion 2. At this time, the sealing end 9a is closer to the welded portion M by the amount by which the extended straight pipe portion 7a and the extended base end portion 8a are extended, and therefore, the heat at the time of forming the sealing end 9a is welded. Since it is easily transmitted to the portion M, it is formed inside the base 5 and as close as possible to the outer surface of the base 5.
Thereby, the peeling phenomenon of the welded portion M due to heat at the time of forming the sealing end 9a can be prevented.

In the mouthpiece mounting step, the mouthpiece 5 filled with an adhesive such as cement is inserted from the side of the extended straight pipe portion 7a of the intermediate product after the exhaust pipe sealing step e, By solidifying the cement, the vehicle signal light bulb 1 shown in FIG. 1 can be manufactured.

According to the manufacturing method configured as described above,
In the tube sealing step d, heat is transferred when the extended base end portion 8a is welded to the open end portion of the extended straight pipe portion 7a, so that the welded portion M
Although the color loss occurs in the tube portion 2 in the peripheral portion including the portion, since the welded portion M is the extended portion, the extended portion is moved away from the tube main body portion 6, and as a result, The color loss range A can be kept within the range covered by the base 5.

In the base attachment process, the base 5 can be covered with the base 5 by mounting the base 5.

Preferably, in the exhaust pipe sealing step e, as shown in FIG. 2, the end portion of the exhaust pipe 9 is melt-sealed (sealing end 9).
The formation of a) is performed under the protection of the welding portion M of the extended straight pipe portion 7a by the heat shut-off means 12. At this time, if the heating shutoff means 12 blocks direct heating of the heating means (for example, a sealing burner) at the time of molding the sealing end 9a, the fluid or heat resistance is satisfied, Any solid member can be applied. Specifically, FIG.
As shown in FIG. 5, the solid member is a ceramic plate having a diameter larger than that of the open end portion of the extended straight pipe portion 7a and having a projection hole for the exhaust pipe 9 in the center, and the fluid is an air shutter. . In the case of a ceramic plate, the welded portion M can be protected by setting so as to cover the open end of the extended straight pipe portion 7a.

According to this structure, the heating means (not shown) at the time of melting and sealing the end portion of the exhaust pipe 9 is the heating cutoff means 12.
Since the welded portion M of the extended straight pipe portion 7a is not directly heated by being blocked by the above, the welded portion M of the extended straight pipe portion 7a is heated by the heating at the time of forming the sealing end 9a of the exhaust pipe 9. Remelting can be reliably prevented, and the bulb 1 with improved reliability can be manufactured.

[0035]

As described in detail above, according to the present invention, the following effects can be obtained.

That is, according to the first aspect of the invention, the welded portion of the bulb portion and the stem portion formed of the colored glass material is between the extended straight pipe portion and the extended base end portion. Therefore, it is necessary to move away from the main body of the tube, which makes it possible to keep the range of color loss due to heat transfer during welding within the range covered by the die, which is outside the chromaticity range specifications. It is possible to provide a vehicle signal light bulb that can prevent light leakage.

Further, according to the invention of claim 1, since it is composed of the colored glass material, there is no increase in cost and deterioration of durability and weather resistance due to the coating composition.

Further, according to the invention of claim 1, the size of the tube body, the position of the filament in the tube body, the size of the mouthpiece, and the installation position of the mouthpiece with respect to the tube body can be changed. Since it can be configured without any other components, there is an advantage that other conventional accessory parts for a lamp such as a lamp housing and a reflector can be used as they are.

According to the second aspect of the present invention, in the tube sealing step, the heat is transferred when the extending base end portion is welded to the opening end portion of the extending straight pipe portion, so that the welding portion is included. Although the color loss occurs in the tube portion in the peripheral portion thereof, since the welded portion is an extended portion, the extended portion is moved away from the tube main body portion, which causes the color loss. The range
Since it can be kept within the range covered by the base, it is possible to easily manufacture a vehicle signal light bulb that prevents light leakage that falls outside the standard of the chromaticity range due to color loss.

According to the third aspect of the invention, the heating means for melting and sealing the end portion of the exhaust pipe is cut off by the heating cutoff means to directly heat the welded portion of the extended straight pipe portion. Since there is no, due to heating when forming the sealed end of the exhaust pipe,
It is possible to reliably prevent remelting of the welded portion of the extended straight pipe portion, and thus it is possible to easily manufacture a vehicle signal light bulb with improved reliability.

[Brief description of drawings]

FIG. 1 is a schematic side view of a vehicle signal light bulb as an embodiment of the present invention.

FIG. 2 is a process explanatory view for explaining a method for manufacturing a vehicle signal light bulb as an embodiment of the present invention, in which (a) to
(E) shows each process, respectively.

FIG. 3 is a schematic side view of a conventional vehicle signal light bulb.

[Explanation of symbols]

1 light bulb (light bulb for vehicle signal light) 2 tube part 3 filaments 4 Stem part 5 mouthpiece 6 Tube body 7 Straight pipe section 7a Extension straight pipe part 7b Open end 8 Stem body 8a Extended base end 9 exhaust pipe 9a Sealed end 12 Heating shut-off means A Color loss range M welding part a Stem molding process c Tube molding process d Tube sealing process d1 gas replacement process e Exhaust pipe sealing process

Claims (3)

[Claims] 1. The tube portion is formed of colored dough glass, having a tube body portion serving as a light emitting portion and a straight tube portion opened at the base end side of the tube body portion. The stem portion is formed with a stem body portion having a filament attached thereto and an exhaust pipe provided so as to project toward the base end side of the stem body portion, and is inserted from the straight pipe portion into the inside of the bulb body portion. Along with the base end portion of the stem body portion is welded to the open end of the straight pipe portion, and the base is the base end portion of the straight pipe portion, the exhaust pipe, and the tube body portion. A light bulb for a vehicle signal lamp, which is mounted so as to cover a side portion, wherein the exhaust pipe is extended with its sealing end being asymptotic to the outer surface of the base inside the base, and the stem body. Part extends along the exhaust pipe at the base end side and protrudes the sealing end. Is formed to have an extended base end portion, and the straight pipe portion extends the open end side to form an extended straight pipe portion, and the open end of the extended straight pipe portion is formed. A vehicle signal light bulb, wherein a portion is provided by welding to an extended base end portion of the stem body portion. 2. The method for manufacturing a vehicle signal light bulb according to claim 1, wherein the exhaust pipe protruding from the extended base end portion is welded to the stem body portion having the extended base end portion. And a stem forming step of forming the stem portion, and a tube forming step of forming the tube portion by providing the straight tube portion having the extended straight tube portion on the proximal end side of the tube body portion. While inserting the stem portion into the inside of the bulb main body portion from the open end of the extended straight pipe portion, the extended base end portion of the stem main body portion is welded to the open end portion of the extended straight pipe portion. And a gas replacement step of replacing the gas in the bulb part with an inert gas through the exhaust pipe after the tube sealing step, and the exhaust pipe after the gas replacement step. Exhaust pipe sealing step for melting the end of the stem to form a sealing end protruding from the extended base end of the stem body After the exhaust pipe sealing step, a mouthpiece mounting step of mounting the mouthpiece by covering the sealing end, the straight tube portion, and the base end side portion of the tube body portion. A method for manufacturing a vehicle signal light bulb, comprising: 3. The method of manufacturing a vehicle signal light bulb according to claim 2, wherein the exhaust pipe sealing step includes melting and sealing the end portion of the exhaust pipe by welding the extended straight pipe portion. A method for manufacturing a vehicle signal light bulb, characterized in that the portion is protected by a heat shut-off means.