JPH09265958A - Coil filament - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the illumination intensity distribution in an illumination light field of a bulb uniform, prevent the uneven vaporization in each position of a light emitting part of a filament, and level the life by forming the filament so that the light emitting part of a coil filament on both sides is thinner than that in the central part. SOLUTION: In a filament comprising coil filaments having a plurality of light emitting parts 2, 3, 3 each wound in double coil shape in the same diameter and at the same pitch, the filament B is formed by making the light emitting part 2 of the coil filament arranged in the central part thick and the light emitting parts 3, 3 of the coil filaments arranged on the outside thin. Further, by melting the both end parts (b) of the light emitting parts 2, 3, 3 by the appropriate amount, the filament having uniform illumination distribution in the illumination light field is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb which has a uniform illuminance distribution in an irradiation light field, prevents partial rupture as much as possible, and makes it possible to make the life of the filament as long as possible. A coil filament to obtain.

[0002]

2. Description of the Related Art Generally, filaments of an incandescent lamp include a coil filament having a single light emitting portion and a coil filament having a plurality of light emitting portions. And
In each case, the winding pitch of the coil filaments was uniform, and in the case of a plurality of coil filaments, the length between the coil filaments and the thickness of the base wire were also uniform. Further, in order to make the illuminance distribution of the irradiation light field of the bulb constant, there is also a coil filament in which the winding pitch at the center of the coil filament is made smaller than the winding pitch at both ends. (For example, see Japanese Utility Model Laid-Open No. 1-161547)

[0003]

However, as described above, in the case of a coil filament having a single light emitting portion in which the winding pitch of the coil filament is uniform, a coil filament using a plurality of such coil filaments is used. In the case of filaments with uniform lengths of the light emitting parts of the coil filaments and the thickness of the original wire, in any case,
In the irradiation field of the light bulb, the central part is brighter than the peripheral part, the illuminance distribution is not uniform, and when the filament is used for a long time, the central part and both sides of the light emitting part do not melt and evaporate uniformly, and the central part is both sides. Often it ruptures from the central part because it melts and evaporates more quickly,
It was supposed to shorten the life peculiar to the filament.

That is, the weight of one light emitting unit is 164.7 m.
g of eight coil filaments (120 V, 1000
As shown in FIG. 7, W) are arranged in two rows before and after in the same manner as in a normal light bulb to produce a filament element, which is applied at a voltage of 130 V in a hydrogen atmosphere. When measuring the quantity, the outermost 1
Although only 0.2 mg of the filament was melt-evaporated, the middle four filaments were 12.2 mg.
It can be seen that the luminous portion of the filament at the center has much higher tearability than the luminous portion of the outer filament.

In the case where the winding pitch at the center of the light emitting portion of the coil filament is made smaller than the winding pitch at both ends, when the light bulb is used, the illuminance distribution of the irradiation light field can be made uniform to some extent. However, since the winding pitch of the light emitting portion of the coil filament must be divided into a coarse portion and a dense portion and wound, the pitch is determined for each length of the light emitting portion. The coil filament, which is a little complicated and once wound, cannot be used for other coil filaments having different lengths of the light emitting portion.

[0006]

In order to solve such problems in the prior art, in the case of a coil filament having a single light emitting portion, the coil filament of the present invention is wound at the same pitch. An appropriate amount of both ends of the light emitting portion of the coil filament is melted, so that the coil at the center of the light emitting portion is thick and the coils at both ends are thin. Further, in the case of a filament composed of a coil filament having a plurality of light emitting portions, the light emitting portion of the coil filament outside the central portion of the coil filament having a plurality of light emitting portions wound at the same pitch is used. The filament is formed by forming the portion thinner, or the length of the light emitting portions of the coil filaments on both sides thereof is shorter than the length of the light emitting portion of the coil filament at the central portion.

Further, the winding diameter of the light emitting portion of the outer coil filament is formed smaller than the winding diameter of the light emitting portion of the central portion of the coil filament having a plurality of light emitting portions wound at the same pitch. A filament is configured. Also, in the case of a filament composed of a coil filament having a plurality of these light emitting portions,
As in the case of a filament composed of a coil filament having a single light-emitting portion, both ends of each light-emitting portion are melted in an appropriate amount so that the coils at both ends are thinner than the respective central portions.

As described above, by forming the light emitting portion of the coil filament by increasing the resistance of the light emitting portion of the coil filament at both ends thereof from the center portion or by increasing the resistance of the light emitting portion outside the central light emitting portion. It is possible to easily obtain a light bulb in which the illuminance distribution of the irradiation light field is uniform, partial breakage is prevented as much as possible, and the life of the filament is extended as much as possible.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the coil filament of the present invention, in the case of a filament having a single light emitting portion wound in a coil shape at the same pitch, both ends of the coil filament are appropriately melted. ,
The coils at both ends are formed thinner than the coils at the center.
When dissolving the both ends, increase the time for immersion in the solution stepwise from the center to both ends depending on the length of the light emitting portion, or increase the time for pulling up after immersing the dissolved portion in the solution. Adjustment may be made so that the coil is formed gradually thinner. During the dissolving step, a resin paint or the like that is not dissolved in the dissolving solution may be applied to the central portion of the coil filament, and after the dissolving step, the paint may be removed with a release agent or the like.

In the case where the coil filament of the present invention is a coil filament having a plurality of light emitting portions wound in a coil shape at the same pitch, the case where the coil thickness is all the same and the case where the coil thickness is changed In some cases, the winding diameter of the coil is changed.

In the case where the thicknesses of the coils are all the same, the length of the light emitting portion of the coil filament is gradually reduced as the distance from the coil filament located in the center to the outside increases, or the length of the light emitting portion is the same. Then, the both ends of each light emitting portion are melted in an appropriate amount, and the coil is formed gradually thinner from the center to the both ends of each coil filament. When dissolving this coil, the amount of dissolution is increased in the order of the coil filaments disposed outside the light emitting portion of the central portion of the coil filament, which are disposed outside the light emitting portion,
It is preferable that the dissolution length of both ends of the coil filament disposed outside the light-emitting portion of the central portion be longer than the dissolution length of both ends thereof.

When the thickness of the coil is to be changed, the coil of the coil filament located at the central portion is made thicker, and the coil is gradually made thinner as the distance from both sides increases, or the filament is formed outside the coil. The length of the light emitting portion of the coil filament is gradually reduced as the distance from the coil filament located at the center increases. When changing the winding diameter of the coil, the winding diameter of the coil is reduced as the distance from the light emitting portion of the coil filament located in the central portion is increased to form the filament. Among the above-mentioned filaments, in the case of a filament consisting of a coil filament having a plurality of light-emitting portions, the length of the light-emitting portion is different when the thickness of the coil of the central filament and the length of the coil of the outer filament are all the same, and When changing the thickness and the winding diameter of the coil, melting both ends of the coil in a desired amount is more effective in making the illuminance distribution of the irradiation field of the bulb uniform.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a coil filament according to the present invention will be described below with reference to the drawings. In the embodiment shown in FIG. 1, in a filament A composed of a coil filament having a single long light emitting portion 1 wound in a double coil shape with the same diameter and the same pitch, both ends b and c of the filament A are The appropriate amount is melted, and the coils at both ends b and c are formed to be thinner than the coil at the central part a. That is, when dissolving both ends, first, a coating solution that is not dissolved in a solution of the filament A, for example, a mixed solution of nitric acid, hydrofluoric acid and water, or a solution of aqua regia is applied to the central portion a of the filament A, After the lengths of both ends b and c are determined according to the length of the light emitting section 1, the entire filament A is immersed in the solution.

When the amount of dissolution at one end b is reached by immersion for a predetermined time, the filament A is pulled out of the solution, and a paint that does not dissolve in the solution of filament A is applied to the end b. Filament A is immersed in the solution. Further, when the other end a is dissolved by a predetermined amount by immersion for a predetermined time, the other end is pulled out of the solution and the paint is removed to obtain a desired filament.

In the embodiment shown in FIG. 2, in the filament composed of a coil filament having a plurality of light emitting portions 2, 3, and 3 each wound in a double coil shape with the same diameter and the same pitch, the filament is positioned at the center. The light emitting portions 2 of the coil filaments are formed thicker and the light emitting portions 3 and 3 of the coil filaments disposed outside thereof are formed thinner to form a filament B. As means for forming the light-emitting portions 3 and 3 of the outer coil filaments thin, the light-emitting portions 3 and 3 of the outer coil filaments are formed using a thinner wire than that of the light-emitting portion of the central coil filament 2. However, even if the coil filaments 3 and 3 are formed with the same diameter as that of the coil filament 2 at the central part, the coil filaments 3 and 3 may be dissolved in a desired amount with a dissolving solution to make them thinner.

After the filament B is formed as described above, both ends b of the light emitting units 2, 3, and 3 are further moved.
By dissolving an appropriate amount by the means shown in the embodiment of FIG. 1, a filament having an irradiation light field with a more uniform illuminance distribution can be obtained. In this embodiment, the filament B having three light-emitting portions 2, 3, and 3 has been described.
The number of light emitting units is not limited. Further, when the number of light-emitting portions increases, it is preferable that the thickness of the light-emitting portions is gradually reduced as the distance from the central portion of the light-emitting portions 3 and 3 arranged outside the central light-emitting portion 2 increases. .

In the embodiment shown in FIG. 3, in a filament composed of a coil filament having a plurality of light emitting portions 4, 5, and 5 each wound in a double coil shape with the same diameter and the same pitch, the filament is positioned at the center. The light-emitting portions 5 and 5 of the coil filaments disposed outside the light-emitting portion 4 of the coil filament to be formed are shorter than the light-emitting portions 4 of the coil filament to form the filament C. After the filament C is formed,
Dissolving both ends b of the light emitting portions 4, 5, and 5 of each coil filament in an appropriate amount, and setting the number of light emitting portions 4, 5, and 5 in the coil filament to an appropriate number are shown in FIG.
And the same as the embodiment shown in FIG. When the number of light-emitting portions increases, it is preferable that the length of the light-emitting portions 5 and 5 disposed outside the light-emitting portion 4 in the central portion gradually decrease as the distance from the central portion increases.

In the embodiment shown in FIG. 4, in a filament composed of a coil filament having a plurality of light-emitting portions 6, 7, and 7 each wound in a double coil shape with the same diameter and the same pitch, the filament is positioned at a central portion. The light emitting portions 7, 7 of the coil filaments on the outer side are shorter and thinner than the length of the light emitting portion 6 of the coil filament to form the filament D. After the filament D is formed,
Dissolving both ends b of the light emitting portions 6, 7, and 7 of each coil filament in an appropriate amount, and setting the number of light emitting portions 6, 7, and 7 in the coil filament to an appropriate number, and The means for forming the light emitting portions 3, 3 outside the thinner 6 is the same as in the embodiment shown in FIGS. When the number of light-emitting portions increases, the length and thickness of the light-emitting portions 5, 5 disposed outside the light-emitting portion 4 in the central portion gradually become shorter and thinner as the distance from the central portion increases. Is preferred.

In the embodiment shown in FIG. 5, a filament made of a coil filament having a plurality of light emitting portions 8, 9, 9 wound in a double coil shape with the same diameter and the same pitch is positioned at the central portion. The light emitting portion 8 of the coil filament and the light emitting portions 9 of the coil filaments arranged on the outside thereof are all formed to have the same length to form the filament E. After the filament E is formed, the light emitting portions 8 of the respective coil filaments,
The means for appropriately dissolving both ends a and b of 9, 9 and the appropriate number of light emitting portions 8, 9, 9 of the coil filament are the same as in the embodiment shown in FIGS. 1 and 2. It is. When the number of light emitting portions increases, the length of the dissolving portion of the light emitting portions 9 and 9 arranged outside the light emitting portion 8 in the central portion may gradually increase as the distance from the central portion increases. preferable.

In the embodiment shown in FIG. 6, a plurality of light emitting portions 1 each wound in a double coil shape at the same pitch.
In the filament composed of the coil filaments having 0, 11, and 11, the winding diameter of the light emitting unit 11 of the coil filament disposed outside the coil filament is smaller than the winding diameter of the light emitting unit 10 of the coil filament located at the center. The filaments F are formed so that the lengths of the light emitting sections 10, 11, 11 are the same. After the filament F is formed, the light emitting portions 1 of the respective coil filaments
It is the same as the embodiment shown in FIGS. 1 and 2 that the number of the light emitting portions 10, 11, 11 of the coil filament is appropriately adjusted, and the means for dissolving both ends b of 0, 11, 11 appropriately. Is. Also, when the number of light-emitting portions increases, the length of the dissolving portion of the light-emitting portions 9 and 9 disposed outside the light-emitting portion 8 in the central portion gradually increases as the distance from the central portion increases, It is preferable to reduce the winding diameter of the coil.

In the above-described embodiment, the light emitting portion of the filament is all wound in a double coil shape. However, the light emitting portion of the filament is wound in a single coil shape. It is self-evident that they fall within the scope of the invention.

[0022]

The present invention is embodied in the form described above and has the following effects. In a coil filament having a single light-emitting portion, the coils at both ends are formed thinner than the center portion thereof. In a coil filament having a plurality of light-emitting portions, both ends of each coil filament are formed smaller than the respective coil filaments at the center portion. Since the coil filaments on both sides are formed thinner than the coil filaments at the center, the resistance at the center of the filament itself decreases and the illuminance decreases, and the resistance at the periphery increases and the illuminance increases. Therefore, in a light bulb using this filament, the illuminance distribution of the irradiation light field becomes uniform, and the amount of melt evaporation at the time of use of the filament itself is averaged, so that the inherent life of the filament itself is obtained as much as possible. Can be accomplished.

Further, since the coil of the coil filament is wound at the same pitch, a long coil that is continuously wound can be cut to a desired length and used, and the pitch of the coil is changed for each filament length. Therefore, there is no need to determine the efficiency and efficiency in mass production is not hindered.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing an embodiment of a filament including a coil filament having a single long light emitting portion wound in a double coil shape.

FIG. 2 is a diagram illustrating a coil formed of a coil filament having a plurality of light-emitting portions wound in a double coil shape. The light-emitting portion coil at the center of the filament is formed to be thick, and the light-emitting portion coil disposed outside thereof is formed to be thin. FIG. 3 is a front view showing an example of a filament.

FIG. 3 is a cross-sectional view of a light emitting unit provided outside a central portion of a filament formed of a coil filament having a plurality of light emitting units wound in a double coil shape. FIG. 3 is a front view showing an example of a filament.

FIG. 4 is a cross-sectional view of a light-emitting portion provided outside a central portion of a filament formed of a coil filament having a plurality of light-emitting portions wound in a double coil shape, the light-emitting portion being shorter and thinner. FIG. 3 is a front view showing an example of a filament.

FIG. 5 is a diagram illustrating a light emitting portion in a central portion of a filament including a coil filament having a plurality of light emitting portions wound in a double coil shape, and a light emitting portion disposed outside the filament has the same length. It is a front view which shows the Example of a filament.

FIG. 6 is a diagram illustrating a light emitting portion disposed outside a central portion of a filament formed of a coil filament having a plurality of light emitting portions wound in a double coil shape and having a smaller winding diameter. FIG. 2 is a front view showing an example of a filament formed in the embodiment.

FIG. 7 is a diagram illustrating a relationship between a disposition position of a coil filament having a plurality of light emitting units and a dissolution / evaporation amount of the coil for each disposition position.

[Explanation of symbols]

 A to F: Filament a: Central part b, c: Both ends 1 to 11: Light emitting part

Claims (7)

[Claims] 1. A filament (A) comprising a coil filament having a light emitting portion (1) wound in a coil shape at the same pitch, wherein the light emitting portion (1) of the coil filament is provided.
Characterized in that both ends (b) and (c) of the coil filament are appropriately dissolved, and both ends (b) and (c) are formed thinner than the central portion (a) of the light emitting portion (1). 2. A filament (B) comprising a coil filament having a plurality of light emitting portions (2) and (3) wound in a coil shape at the same pitch. A coil filament characterized in that the light emitting portion (3) of the coil filament disposed outside is formed thin. 3. A filament (C) comprising a coil filament having a plurality of light emitting portions (4) (5) wound in a coil at the same pitch, wherein the length of the light emitting portion (4) of the coil filament in the central portion is long. A coil filament, characterized in that the length of the light emitting part (5) of the coil filament disposed outside the coil filament is shortened. 4. A filament (D) comprising a coil filament having a plurality of light-emitting portions (6) and (7) wound in a coil shape at the same pitch. A coil filament characterized in that the length of the light emitting portion (7) of the coil filament disposed outside is short and thin. 5. Both ends (b) and (c) of the light emitting portions (2) to (7) of each coil filament are melted in an appropriate amount, and both ends (b) (b) ( 5. The coil filament according to claim 2, wherein c) is formed thin. 6. A filament (E) comprising a coil filament having a plurality of light emitting portions (8) and (9) wound in a coil shape at the same pitch. A coil filament characterized in that both ends are appropriately melted and both ends (b) and (c) are formed narrower than a central portion (a) of each light emitting portion (8) (9). 7. A light emitting portion of a coil filament disposed outside a winding diameter of a light emitting portion of a coil filament in a central portion, (2), (4), (6), (8) and (10).
(5) The coil filament according to any one of claims 2 to 6, wherein the winding diameter of (7), (9) and (11) is small.