JPS6166357A - Noncrosslinking tungsten-halogen lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD This invention relates generally to tungsten-halogen type incandescent lamps, and more particularly to improvements in the filament support structure of such lamps.

[Background of the invention]

In conventional tungsten-halogen lamps, the parameters related to the mounting member are the limiting factors that determine the size of the lamp, which governs the performance characteristics of the lamp. Performance characteristics of this type include coil temperature, wattage and light distribution.

An example of a mounting structure used in conventional tungsten-halogen lamps is disclosed in U.S. Pat. No. 4,415,833 by Oetken et al. Kendrick (
U.S. Pat. No. 4,45 by Kendrick et al.
0.381. Typically, lamps of this type include an insulating bridging member (quartz or glass), usually placed below the filament structure and in which the filament leads are embedded. This bridging member holds the filament by fixing the 17-wire of the filament. This bridging member also serves to determine the size of the attachment portion.

Most lamps of this type are of "single-ended" construction, in which only one end of the lamp has a lead-in wire for the filament and optional additional structures (e.g. made of molybdenum). The foil member) is press-sealed near the foil member.

The other opposite end is typically sealed using well-known chip operations.

Various bridging structures are disclosed in the following US patent specifications:

U.S. Patent No. 3,62 by Demas
US Patent No. 3,756,456 to Middlehoek et al. K. US Pat. No. 4 to DeFraeye
No. 764.845 U.S. Patent No. 5.7FH to Flynn
It will be appreciated that the '1,555 bridging member adds to the cost of the lamp structure and is a potential source of contamination. The additional cost is due to the labor and materials required to manufacture the bridging structure and to position the filament structure therein. Contamination is due to moisture or other impurities that are trapped in the bridging member and expelled under the high temperatures encountered during lamp operation.

[Summary of the invention]

According to the invention, the lamp filament structure is improved by eliminating the usual glass or quartz bridging member. Instead, a wire support member is provided which is connected to one end of the filament coil. The wire support member extends in two directions from the connection point. Each extension has sufficient length and flexibility to extend beyond the interior dimensions of the lamp envelope. Therefore, when the wire support member is first assembled into such a lamp, the extension of the wire support member must be compressed and the lamp envelope connected to the filament and compressed wire support member. or vice versa.

Once installed in the lamp envelope, the lamp filament support structure is held in the installed position within the envelope by friction between the inner surface of the envelope and the compressed wire support member. The lower portion of the lamp envelope is then shaped such that the ends of the wire support member extensions and the filament support leads are embedded into the press portion of the lamp envelope (i.e. simultaneously using known pressing equipment). Press sealed. This results in an improved lamp structure in which the filament support structure is secured and withstands shock with less potential for contamination.

[Detailed description of preferred embodiments]

Preferred embodiments of the present invention will be described below with reference to the drawings.

Before describing the details of the improved filament support structure of the present invention, the main components of the lamp will be described. From this point of view, identical reference numbers shall indicate identical parts. Thus, in all 100 lamp examples, the conventional (
A generally cylindrical hermetically sealed translucent envelope 12 is provided. A pair of molybdenum foil seals 16 are disposed within the pace section to internally connect the input leads 18 to the filament. High melting point materials, such as quartz, are commonly used for the envelope 12, although other hard glasses may also be used. The hermetically sealed envelope 12 is normally filled with an inert gas such as argon, nitrogen, krypton or a mixture thereof and a halogen adduct such as iodine or bromine. According to the invention, the lamp envelope is preferably of the bromine-filled type. This bromine charge is provided in the form of a mixture of hydrogen bromide.

Any of the various types of filaments can be incorporated into the lamp. One basic form of filament is described in connection with the present invention.

FIG. 1 illustrates a tungsten filament 24, technically referred to as a CC2V (coiled coil) filament, which has two individual tungsten filament coils 26.2B.

These coils 26, 28 each have a lead wire (leg) 27
．． It is fixed at 29.

In the embodiment illustrated in FIG. 1, the filament support structure includes a crossover portion 50 between two filament coils.
Connect the wire 20 to the filament coil 26.28 at
Equipped with. As illustrated, the filament is retained by forming a loop 32 of wire 20 with a crossover portion 30 passing therethrough. In this way, the base of the loop retains the filament at the crossover portion 30. Wire 20 is made from a ductile material that is compatible with the standard environments encountered in halogen lamp operation. Suitable materials include tungsten and molybdenum.

The wire support structure 20 extends outwardly from the loop portion 32 in two directions by wire extensions 40° 42. As illustrated in FIG. 5K, the distal end of each extension 40.42 is inserted into the press space portion 14 of the lamp envelope 12 along the foil seal 16 and the input lead 1B during a conventional press seal operation. embedded.

FIG. 2 illustrates a preferred method of assembling a support structure, indicated schematically at 60, to the open end of the glass tube that will ultimately form the envelope 12, prior to evacuation and sealing. Illustrate. As illustrated in FIG. 2, the extensions 40.42 of the wire support structure 20 extend beyond the inner circumference of the envelope (i.e., beyond the inner circumference of the envelope) when not compressed. are also spaced apart). Therefore, the support structure 60
In order to insert the envelope into the envelope, the extension must be compressed in the direction indicated by the arrow so that the envelope slides onto the support structure. The friction created between the wire extension 40.42 and the inner wall surface of the envelope allows the support structure to be held in place and the filament 24.26 to be properly positioned for optimum illumination of the lamp. . Previous insertions are made until both the support structure and the filament are located at a predetermined distance within the glass tube. The expression 'predetermined distance' means such a distance that the press sealing of the open end of the glass tube in the next stage encompasses the sealing of the end of the extension 40.42 and the end of the lead wire 27.29. It will be appreciated that this four-point hold in this location provides a secure hold of the filament in the desired location.The final step in this process is to remove the glass tube using a tip-forming operation well known in the art. Includes tip processing on the opposite (top in Figure 2) end.

In accordance with the invention, various modifications of the support loop 52 illustrated in FIG. 1 are contemplated, and FIGS. 3-5 illustrate various embodiments of such a loop. Each of these alternative embodiments includes a lamp support structure 60 within a lamp envelope comprising a pair of molybdenum foil seals 16 and a prespace portion 14 connected to the filament leads 27, 29; The filament leads 27.29 form part of or are connected to the filament coils 26.28, and both filament coils are interconnected by the above-mentioned crossover portion 3G.

Referring to FIG. 3, support wire 20' is similar to support wire 20 of FIG. 1 in that the filament is retained or supported by the base of loop 52. Referring to FIG. However, in this embodiment, the loop 32' is pivoted upward (toward the cylindrical end of the lamp envelope) so that the loop 32' is swiveled upward (towards the cylindrical end of the lamp envelope) so that the loop 32' 70 to hold this loop securely within it. This extension provides additional filament support points and therefore increases shock or vibration resistance. The fornix portion 70 is formed as a result of the well-known chip processing described above.

FIG. 4 shows an oblong shape with a lower end 321 holding the filament at the crossing portion 30 and an upper end 55 shaped to be mounted within a cylindrical device 63 to further increase impact resistance. Here is an example of a loop structure. This embodiment combines the advantages of both the embodiments of FIGS. 1 and 2.

In FIGS. 5 and 5A, loop 32 is generally similar to that illustrated in FIGS. 1 and 2. In FIGS. But near the loop (
The portion 80 (FIG. 5A) of the wire 20 is formed into a substantially semicircular (arc-shaped) shape that matches (and engages with) the inner peripheral surface of the lamp envelope (see FIG. 5A). This allows the inner wall surface of the lamp envelope to be used for positioning and impact-resistant retention of the filament.

A comparative test was conducted between a non-bridging installation structure as illustrated in the example of FIG. 1 and a quartz bridging installation assembly relating to the prior art. Test results showed that the quartz-bridged lamp samples had an average of 808 hours of open operation before failure, while the valve-bridged lamps remained open for more than 850 hours without failing. Also, many quartz-bridged lamps exhibit excessive crystal growth indicating contamination. This contamination is believed to be caused by the quartz bridge used in the lamp construction. On the other hand, unbridged samples processed together with crosslinked samples did not exhibit this type of contamination.

From the above description, it will be clear that various applications and modifications can be made without departing from the technical idea of the present invention.

FIG. 1 is a partial plan view of a tungsten-halogen lamp according to the invention.

FIG. 2 is an enlarged partial cross-sectional view of FIG. 1 illustrating the process for inserting the support structure into the lamp envelope.

5-5 are partial plan views of tungsten-halogen lamps according to alternative embodiments of the invention.

Figure @5A is a sectional view taken along line A-A in Figure 5, showing a curved part of the filament supporting wire.

The names indicated by each number in the figure are listed below. Note that in the figures, the same numbers indicate the same parts.

10: Lamp 12: Envelope 14: Base part 16: Foil sticker 18: Input lead wire 20.20' = wire (support structure) 24: Filament 26.28: Filament coil 27.29: Lead wire 30: Crossing part 32.321: Loop 32": Bottom end 33: Upper end 40.42: Extension part 60: Support structure 70: Fornix part

Claims (10)

[Claims] (1) A hermetically sealed translucent envelope, an inert filling and halogen disposed within the envelope, and a filament means comprising a pair of tungsten filaments interconnected at one end. , a filament wire extending from the opposite end of the filament, and a filament support wire forming a loop at the interconnection of the filament to support the filament means, the filament support wire comprising: A tungsten-halogen lamp having an extension extending from a loop that is compressed into the lamp envelope to hold it in a fixed position within the lamp and to position and retain the filament means within the envelope. (2) A portion of the lamp envelope is pressed at one end of the lamp envelope to form a base portion for fixedly holding both the filament wire and the extension of the filament supporting wire. A tungsten-halogen lamp according to claim 1. 3. A tungsten-halogen lamp according to claim 2, wherein the lamp envelope includes a cylindrical cannula portion into which the loop extends. 4. The tungsten-halogen lamp of claim 2, further comprising a pair of foil seals connecting individual outer filament leads to each of the tungsten filaments. (5) A tungsten-halogen lamp according to claim 2, wherein the filament supporting wire has a portion extending into the recess of the lamp envelope. (6) The wire for supporting the filament includes a pair of arcuate portions shaped to match the inner periphery of the lamp envelope, and each of the arcuate portions engages with the inner wall surface of the lamp envelope. 2. The tungsten-halogen lamp according to claim 2. (7) In a method of manufacturing a tungsten-halogen lamp comprising a glass envelope and a filament member inside the lamp, a substantially cylindrical glass tube of a certain length having at least one open end is provided; a filament member comprising a coiled tungsten filament and an extending lead secured to or forming a part of one end of the coiled tungsten filament; a filament support structure having a wire member extending over the filament member and having a pair of extensions spaced apart more than an inner diameter of the generally cylindrical glass tube, the extensions of the filament support structure having , the filament member and the filament support structure are inserted a predetermined distance into the open end of the glass tube to press against and frictionally engage the inner surface of the glass tube, and the lead wire is inserted into the open end of the glass tube. and a portion of each extension of the filament support structure, forming a sealing portion at the opposite end of the glass tube to define a glass envelope. A method of manufacturing a tungsten-halogen lamp comprising the steps of: (8) Provide a fornix portion at the opposite end of the glass tube, and then, upon insertion of the filament member and filament support structure, at least a portion of the loop of the filament support structure into this fornix portion; 8. A method of manufacturing a tungsten-halogen lamp as claimed in claim 7, comprising the step of arranging. (9) A method of manufacturing a tungsten-halogen lamp according to claim 7, wherein the sealing of the open end of the glass tube is performed using a press sealing operation. (10) A method of manufacturing a tungsten-halogen lamp according to claim 7, wherein the sealing of the opposite end of the glass tube is performed using a chip forming operation.