JPH04368769A - Filament of tubular bulb or the like - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process of a filament so that the filament may be homogenized while the problem of environmental pollution attendant upon melting a core member may be solved to design the filament without difficulty by alternately and repeatedly bending a tungsten fine-sheet of thin-wall at its specified parts with each other so as to form the filament in a shape having continuously bent section of required length. CONSTITUTION:A filament 1 is formed through the process of pressing a tungsten fine-sheet of specified thickness by a pressing device, and it comprises two end-sections 2, 3 each in its vertical direction and both positioned alternately with each other, and a three-dimensional section 4 formed out of a continuously bent section in its horizontal direction and formed by alternately and repeatedly bending the specified parts of a section between the two end-sections with each other. Then the filament is constructed such that the two end-portions 2, 3 are joined respectively to stays 5,6 in a tubular bulb. Since the filament can thus be formed through a process of press working, its manufacturing process is simplified so that it may be homogenized while being able to be designed without difficulty as occasion demands. Besides, the problem of environmental pollution due to a solution or the like can be solved without the need of melting a core member.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filament that can be used in bulbs such as incandescent light bulbs and halogen light bulbs, or as other illumination or light sources.

0002

[Prior Art] Conventional manufacturing of filaments for tubes, etc. can be roughly divided into two methods, both of which mainly involve forming a coil by winding it around a core material. Forming a coil by winding is essential.

One of them is to wrap a tungsten wire with a circular cross section around a core material (for example, brass wire, nickel silver wire, molybdenum wire, iron wire, etc.), heat treat it at a predetermined temperature, and then
This method involves melting the core wire using a chemical or the like to obtain the desired tungsten coil.

Another method is to wrap a specially treated tungsten wire around the core material of a round bar made of piano wire material, SKS material, etc., and use the coil back of the tungsten wire after cutting to wrap the core material. This is a method of extracting it.

[0005]

[Problems to be Solved by the Invention] Problems when dissolving the core material are the management and handling of the chemical solution, the treatment of the toxic gas and dissolved solution generated when the core material is melted, and the problems caused by the generation of nitrogen oxides. Due to regional restrictions due to pollution and other concerns, large-scale capital investment is required for mass production.

[0006]Although removing the core material does not cause the pollution problems that occur when it is melted, there are difficulties in the process, and further improvements are needed in the manufacture of products that require high precision in coil pitch. .

[0007] This invention was devised to solve the above-mentioned conventional problems, and its purpose is to provide a filament for tubes, etc., with a new configuration that can be molded without using a core material. It is in.

[0008]

[Means for Solving the Problems] Problems in precision and manufacturing with conventional filaments are due to the fact that the main body of the filament is a coil. Therefore, even if the main body has a form other than a coil, as long as the same level of light emitting effect can be achieved, there is no particular need for the main body to be a coil.

[0009] From this point of view, the inventor of the present invention has conducted various studies on the form of filaments, and as a result, has discovered a filament with a new configuration. therefore,
The filament of this invention does not have a coil as the main body as in the past, but has a completely new form as a filament, that is, it is made of thin tungsten thin plates, and the main body of the filament is alternately and repeatedly bent. It is characterized in that it consists of a continuous curved portion in length.

The thin tungsten plate used in the present invention has a wall thickness of 0.01 mm to 0.5 mm.
, a width of 0.5 mm to 3.0 mm is preferable, and the size can be selected arbitrarily depending on the intended use of the filament.

[0011]

[Function] Unlike the case of a coil, in the filament having the above structure, the main body can be formed by planar processing, so that the forming accuracy of the main body can be further improved. Furthermore, the filament itself can be heat-treated at a higher temperature than before, and there is less distortion during molding, so it does not deform during the high-temperature heat treatment.

Furthermore, since both ends of the filament are flat and have directionality, wire joining is easier than in the case of a wire with a circular cross section, automatic wire joining is also possible, and loss during wire joining is reduced.

[0013]

[Example] The figure shows one of the filaments formed by punching.
As an example, the filament 1 is composed of both ends 2 and 3 in the longitudinal direction which are alternately located, and a main body 4 formed by continuous bending parts in the lateral direction which are alternately and repeatedly bent between the end parts 2 and 3.

The filament 1 is formed by punching a thin tungsten plate with a wall thickness of 0.5 mm using a press machine, and has both ends 2 and 3 of the thin plate with a width of 1.0 mm.
A plate of the required width is punched out horizontally between the proximal ends of the plate, and at the same time, slits of approximately 0.8 mm are punched out at intervals of 1.0 mm from top to bottom of the plate to form a rectangular continuous bent section. The main body portion 4 is formed by.

As shown in FIG. 3, the filament 1 made of such a thin tungsten plate is connected to the tees 5 and 6 in the bulb with the plane of the main body 4 facing the direction of light emission. Furthermore, since both ends 2 and 3 of the filament are flat, connecting the filament can be performed more easily than when using a wire rod.

Next, the width (A) is 1.0 mm, and the wall thickness (B) is 0.0 mm.
The characteristics of the filament 1 of 0.05 mm are shown below.

[0017]

[Table 1] Voltage (V) Current (A) Power (W)
Luminous flux (Lm) Efficiency (Lm/W) 2.0
5.0 10.0
1.0 0.10 2.5
5.6 14.0 4
．． 0 0.29 3.0
6.5 18.6 13.9
0.74 3.5
6.8 23.8 34.5
1.45 4.0
7.5 30.0 79.0
2.63 4.5 8.
1 36.5 153.0
4.19 5.0 8.6
43.0 245.0 5.
70 6.0 9.7 5
8.2 580.0 9.96
6.5 10.0 66.3
790.0 11.92

[0018]
In the above embodiment, the main body part 4 is continuously bent into a rectangular shape, but the main body part is not limited to a rectangular shape, and can also be continuously bent in the plane direction by press working, so the forming means is also limited to punching. It is not something that will be done.

[0019]

[Effect of the invention] The filament for tubes, etc. of this invention is
As described above, since it is made of a thin tungsten thin plate and the main body is made up of continuous bent parts of a required length that are alternately bent repeatedly, the following effects are achieved.

[0020] Since it can be formed by press working, the manufacturing process is simplified compared to conventional filaments whose main body is a coil, and dimensional tolerances are also reduced, making it possible to obtain a uniform product as a whole.

[0021] Unlike the case of coils, melting of the core material is not required, so the problem of environmental pollution due to harmful gases generated from solutions and dissolution waste liquids is solved, and thermal deformation is extremely small compared to coils. , it does not lose its shape even when processed at higher temperatures than before.

■ The characteristics required for a light bulb can be arbitrarily designed based on the thickness, length and width of the main body,
The sag deformation of the filament during lighting can also be dealt with by curving the main body part in the opposite direction in advance, taking into consideration the direction in which the filament is connected, so there is no problem even if the filament is made of a thin tungsten plate. do not have.

■Compared to filament made of thin wire,
It has high tensile strength, can withstand sudden voltage fluctuations, and has excellent vibration resistance, so it has a long life.

[0024] With filaments made of thin plates, the connecting wires have directionality, making automatic feeding easier in the manufacture of light bulbs, etc., and since both ends are flat, connecting wires by clamping, welding, etc. It becomes easier and the precision of connecting wires also improves.

■ It can be widely used not only for general lighting but also for special lighting and light sources such as medical lighting equipment.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of a filament for a tube or the like according to the present invention.

FIG. 2 is a side view as well.

FIG. 3 is a perspective view showing a wire connection state.

[Explanation of symbols]

1 Filament 2 End part 3 End part 4 Main part A Width B Thickness

Claims (2)

[Claims] 1. A filament for use in tubes, etc., which is made of a thin tungsten thin plate, and the main body is made up of continuous bent portions of a required length that are alternately bent repeatedly. [Claim 2] The thin tungsten plate has a wall thickness of 0.01 mm.
A filament for tubes, etc., characterized by having dimensions of 0.5 mm to 0.5 mm and a width of 0.5 mm to 3.0 mm.