JPH11283585A - Coil filament top fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mass-produce uniform products, without generating production losses by forming a pair of luminescent parts by bending a coil filament at the specified intervals and fixing the fixing part formed by inserting together coils in the bending part to the inside of a chip of a bulb. SOLUTION: A coil filament 1 has a fixing part 1a being fixed to the inside of a chip 2a of a bulb 2, a pair of luminescent parts 1b, 1b, and inner and outer lead wire parts of the specified length, and a short wire 5 made of tungsten is inserted into the central part of the filament 1. The central part is bent into reverse U-shape, so that the distance between free ends becomes equal to the arranging distance of the luminescent parts 1b, 1b of a pair of filaments, and a fixing part la is formed. This bent fixing part 1a is sealed and fixed to the inside of the chip 2a, and the both free ends 5a, 5a of the short wire 5 are projected into the bulb 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for fixing the top of a coil filament in a small-sized light bulb of a single die type.

[0002]

2. Description of the Related Art In general, as a device for fixing the top portion of a coil filament in a small-sized light bulb of a single-die type, as shown in FIG.
The bent portion of the coil is raised outward to form an anchor hook 11, and one side of the anchor hook 11
A pair of coil filament light emitting portions 12 and 12 are formed, and a hook-shaped anchor 13 is hooked to the anchor hook portion 11 to seal and fix the upper end of the anchor 13 inside the tip 14a of the bulb 14. The lower ends of the inner lead wires 12a, 12a formed by extending the lower coil filaments of the pair of coil filament light emitting portions 12, 12 to a predetermined length are connected to the outer leads via molybdenum foils 16, 16 in the stem 14b. Some are connected to lines 15,15. Also, as shown in FIG.
A plurality of coil filament light-emitting portions 18 in which both ends and a connection portion are extended to a predetermined length and connected in series are provided, and the connection portion of the extended coil filament light-emitting portion 18 has its center bent and The whole is twisted and anchors 19, 20 above and below the coil filament 18
Are respectively formed. Anchor thus formed
Of the 19 and 20, the upper end of the anchor 19 is assembled and the valve 17
The lower end of the anchor 20 is embedded and fixed in the stem 17b, and a pair of internal lead wires formed by both ends of the extended coil filament 18 are fixed. 22, 22 are stem 17b
Within the pair of external lead wires 23, 23, molybdenum foil 2
Some are sealed via 4,24. (52
-156287)

[0003]

According to the former device for fixing the top portion of the coil filament, the anchor 13 is hooked to the hook portion 11 of the pair of coil filaments.
In order to seal and fix the upper end of the valve 13 inside the tip 14a of the valve 14, one thin anchor 13 must be fixed so as to be located at the center of the valve 14. Therefore, a joining technique is required. Not only has the problem of causing a great deal of product loss, but also has the risk that the anchor 13 may fall out of the chip 14a. According to the latter device for fixing the top portion of the coil filament, the step of forming the anchor 19 whose center is bent and the whole is twisted above the coil filament light-emitting portion 18 and the step of insulating these with an insulating material are described. Required, so that the bulb manufacturing process becomes multi-step, and like the former,
Insulation technology is required, and production by inexperienced people not only causes a great deal of product loss, but also causes the anchor 19 to fall out of the chip 17a, resulting in high cost in mass production and a uniform product not being obtained. There was a problem.

Therefore, the present invention does not use an anchor,
By fixing the coil filament itself in the chip, a uniform product can be obtained in mass production without causing product loss even in production by inexperienced people,
In addition, the filament fixing part is prevented from falling out of the chip as much as possible to obtain a long-life coil filament, and cost is reduced by simplifying the process and configuration without the need for special internal leads and columns. It is an object of the present invention to provide a coil filament top fixing device that can achieve the above.

[0005]

Therefore, in the coil filament top fixing device according to the first aspect of the present invention, the coil filament is bent at a predetermined interval to form a pair of light emitting portions, The coils of the bent portion are integrally sandwiched to form a fixed portion, and the fixed portion is fixed in the chip of the valve. in this way,
The formation of the fixed portion is sufficient simply by inserting the bent portions of the pair of left and right coil filaments integrally into the mutual coils, so that not only can the manufacturing process be reduced and simplified, but also the insertion portion can be simplified. Since the coil itself is fixed in the tip of the valve, there is no need for a conventional anchor.The coil itself, which is thicker than the anchor, is fixed in the chip, so even inexperienced persons can easily arrange the coil filament in the center of the valve. In addition to the fact that the filament can be provided and the sealing area of the fixing portion in the chip is large, there is no possibility that the filament will fall out of the chip.

In the apparatus for fixing the top portion of a coil filament according to a second aspect of the present invention, the coil filament is bent at a predetermined interval, and a short-circuit line is inserted into the bent portion, so that a pair of the fixed portion and the light emitting device are emitted. A part is formed and the fixing part is fixed in the tip of the valve. In this way, the fixing part in which the short-circuit wire is inserted is fixed in the tip of the valve, so that it is simpler to manufacture than the one that uses an anchor to fix the filament, and even the inexperienced person can fix the top of the filament. Can be easily performed, which contributes to cost reduction in combination with not using an anchor, which is extremely advantageous in mass production.

Further, in the coil filament top fixing device according to the third aspect of the present invention, the interval between the open ends of the short-circuit lines of the fixing portion is formed at an equal interval to a predetermined interval of the pair of light emitting portions, and the fixing is performed. The part is twisted, and a part of the fixing part before the twisting and the twisted part are fixed in the tip of the valve. In this way, by forming the interval between the open ends of the short-circuit line at the same interval as the predetermined interval of the pair of light-emitting portions, the pair of light-emitting portions can be maintained in parallel, causing a local disconnection accident and the like. At the same time, the positioning of the filament is ensured and easy at the same time, and the fixing part is twisted, and a part of the fixing part and the twisted part before this twisting are fixed in the chip of the valve. As a result, the drop of the filament fixing portion from inside the chip can be further prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a top fixing device for a coil filament according to the present invention, a pair of light emitting portions and a coil filament having a predetermined length corresponding to a fixed portion fixed in a chip are inverted at a predetermined interval. By bending it into a U-shape, left and right 1
A pair of light emitting portions are formed, and the coils of the inverted U-shaped bent portion are sandwiched together to form a fixed portion, and the fixed portion is fixed in the chip of the bulb. As described above, since the formation of the fixing portion is sufficient simply by inserting the bent portions of the pair of left and right coil filaments integrally into the mutual coils, the production is simple and easy, and the production process can be reduced. The anchor itself is fixed in the tip of the valve because the coil itself is fixed in the tip of the valve, so there is no need for a conventional anchor, and the coil itself that is thicker than the anchor is fixed in the tip, so fixing in the tip The sealing area of the part becomes large, and even an inexperienced person can easily produce without causing a product loss, and there is no fear that the filament falls out of the chip.

According to another apparatus for fixing the top of a coil filament of the present invention, a center portion of a coil filament having a predetermined length corresponding to a pair of light emitting portions and a fixing portion fixed in a chip is provided. A short-circuit line made of tungsten is inserted. The coil filament where the short-circuit wire is inserted is bent in an inverted U-shape together with the short-circuit wire to form a fixing portion to be fixed in the chip of the valve. The interval between the open ends of the short-circuit line bent in an inverted U-shape is formed at an equal interval to the interval between a pair of light-emitting units provided in the bulb. The bent shape of the short-circuit line is U
The shape may be a letter shape or a V shape, but it is preferable to set the predetermined interval between the pair of light emitting portions and to make the shape of the light emitting portion a reverse U shape or a downward U shape in the processing steps. When the bent shape of the short-circuit line is V-shaped, a vertical portion is formed at the open end of the pair of coil filaments at an equal interval to the arrangement interval of the light-emitting portions in order to maintain the light-emitting portions in parallel. I do. in this way,
By forming the interval between the open ends of the short-circuit line at the same interval as the arrangement interval of the pair of coil filaments, the positioning of the pair of coil filaments can be performed reliably and easily.

[0010] The lower ends of the pair of coil filaments configured as described above are connected to external leads via molybdenum foil by a conventional method. The fixing portion formed at the upper end of the pair of coil filaments is sealed and fixed in a chip at the top of the valve which is welded at the same time as the exhaust in the valve. At this time, it is preferable that the open end of the short-circuit line projects from the inside of the chip to the inside of the bulb. The open end of the short-circuit line is equidistant from the arrangement interval of the light-emitting portions of the coil filament, and the U-shaped bent portion of the short-circuit line is sealed and fixed in the chip at the top of the valve, as in the conventional case. Compared to a pair of coil filaments whose tops are hooked with a single anchor and only the straight part is sealed and fixed in the chip at the top of the valve, the positioning of the filaments is more reliable and easier, and even inexperienced persons Since the top of the filament is easily fixed and the sealing area is large, it is possible to prevent the fixing portion from falling off from inside the chip. Further, in the case where the fixing portion is twisted, and the part of the fixing portion before the twisting and the upper side of the twisted portion are fixed in the tip of the valve, the fixing area of the fixing portion in the tip becomes large. Then, since it is fixed at a different angle, the further bent portion is prevented from falling off from inside the chip.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a coil filament fixing device according to an embodiment of the present invention. FIG. 1 is a partially omitted front view showing a state in which a short-circuit wire made of tungsten is inserted into the center of a single-coil filament, and FIG. 2 is formed by bending the single-coil filament together with the short-circuit wire into an inverted U-shape. FIG. 3 is a cross-sectional view showing a state in which the fixed portion is sealed and fixed in the exhaust tip of the valve. FIG. 3 shows the fixed portion in FIG. FIG. 4a is a front view of a main part showing a state in which a single coil filament is bent in an inverted U-shape at the center to form a fixing part, and FIG. 4b is a sectional view of the fixing part in FIG. 4a. FIG. 5 is a front view of a main part showing a state in which right and left straight portions are sandwiched between mutual coils. FIG. 5 shows a fixed portion of a double coil filament having a fixed portion formed in the same manner as FIG. In a state where it is sealed and fixed It is sectional drawing of the principal part shown.

In FIG. 1 and FIG. 2, a single-coil filament 1 is fixed to a tip 2 a of a bulb 2.
1a, a pair of light emitting portions 1b, 1b, and a predetermined length including an internal lead wire portion (not shown) connected to the external lead wires 3, 3; Line 5
Is inserted. The central portion of the short-circuit line 5 is bent into an inverted U-shape so that the interval between its free ends is equal to the interval between the light emitting portions 1b, 1b of the pair of filaments, and is fixed to the fixed portion 1a.
Is formed. The bent fixed portion 1a is
The two free end portions 5a, 5a of 5 are projected into the valve 2 and sealed and fixed in the chip 2a by a conventional method.

In FIG. 3, when the filament fixing portion 1a in FIGS. 1 and 2 is sealed in the chip, an inverted U-shape is maintained while maintaining the space between the free ends 5a, 5a of the short-circuit wire 5. The bent portion is twisted 90 ° in the axial direction to form a fixed portion 1a, and the fixed portion 1a
Sealed and fixed in 2a.

In FIG. 4, a central portion of a single coil filament 1 having a predetermined length similar to that in FIG. 1 is connected to a pair of light emitting portions 1 as shown in FIG. 4A.
A portion corresponding to the length of the fixed portion 1d which is bent in an inverted U-shape at predetermined intervals in accordance with the arrangement intervals of b and 1b and is sealed and fixed in the valve chip from the top of the bent portion. As shown in FIG. 4b, the single coil filaments 1, 1 above the elongated portions 1c, 1c are alternately sandwiched and integrated with each other, as shown in FIG. 4b. The fixing portion 1d is formed. This fixing portion 1d is sealed and fixed in the chip 2a in the same manner as in FIGS.

FIG. 5 is similar to FIG. 4 except that a pair of light emitting portions 6, 6 of a filament are formed in a double coil.

[0016]

As described above, according to the present invention, the coil filament itself is fixed in the chip without using an anchor, so that even an inexperienced person can produce a large amount of product without causing product loss. A uniform product can be obtained, and a long-life coil filament can be obtained by preventing the filament fixing part from falling off from the inside of the chip as much as possible. It is possible to provide a coil filament top fixing device that can be simplified to reduce costs.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a coil filament top fixing device according to the present invention, and is a partially omitted front view showing a state where a short-circuit wire made of tungsten is inserted into a central portion of a single coil filament. .

FIG. 2 is a cross-sectional view showing a state in which a fixed portion formed by bending a single coil filament in an inverted U shape together with the short-circuit line in FIG. 1 is sealed and fixed in an exhaust chip of a valve.

FIG. 3 is a cross-sectional view showing a state in which the fixing unit in FIG. 2 is twisted upward by 90 ° and is sealed and fixed in the exhaust tip of the valve.

FIG. 4 (a) shows a single coil filament having a reverse U at its center.
FIG. 2B is a front view of a main part showing a state where the fixing part is formed by being bent in a letter shape, and FIG. 2B is a front view of a main part showing a state where left and right linear portions of the fixing part in FIG. It is.

FIG. 5 is a cross-sectional view of a main part showing a state in which the fixing portion of the double coil filament having a fixing portion formed in the same manner as in FIG. 4b is sealed and fixed in a chip of a valve.

FIG. 6 is a cross-sectional view of a small light bulb showing an embodiment of a conventional coil filament top fixing device.

FIG. 7 is a cross-sectional view of a miniature bulb showing another embodiment of a conventional coil filament top fixing device.

[Explanation of symbols]

 1 Coil filament 1a, 1d Fixed part 1b, 6 Light emitting part 2 Valve 2a Chip 5 Short wire 5a Open end

Claims (3)

[Claims] 1. A pair of light emitting portions (1b, 1b, 6) are formed by bending a coil filament (1) at predetermined intervals, and the coils of the bent portion are integrally sandwiched. A top fixing device for a coil filament, wherein a fixing portion (1d) is formed, and the fixing portion (1d) is fixed in a tip (2a) of a valve (2). 2. A coil filament (1) is bent at a predetermined interval, and a short-circuit line (5) is inserted into the bent portion to thereby fix the fixed portion (1a) and a pair of light emitting portions (1b, 1b, 6). ) And the fixing portion (1a) is attached to the tip (2a) of the valve (2).
A top fixing device for a coil filament, wherein the fixing device is fixed in the inside. 3. The open ends (5a, 5a) of the short-circuit line (5) of the fixed part (1a).
The interval between them is formed at the same interval as the predetermined interval of the pair of light emitting portions (1b, 1b, 6), and the fixing portion (1a) is twisted, and the fixing portion (1a) before this twisting is twisted. 3. The top fixing device for a coil filament according to claim 2, wherein the part and the twisted part are fixed in the tip (2a) of the valve (2).