JP2006147586A - Electric lamp having outer tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guarantee sure connection resistable against a burden between an outer tube and an inner tube sealing member in an electric lamp having the outer tube comprising an inner tube, which is extended in the longitudinal direction and hermetically sealed by sealing members 6 and 32 at the ends facing mutually and includes a light emitting means, and covering the whole of the inner tube 1 with a tube member 13 in at least one end attached by means of an annular protrusion part 12 arranged in the sealing members. <P>SOLUTION: The lamp inner tube 1 extending in the longitudinal direction and defining the lamp longitudinal axis A is sealed in its mutually facing ends by means of the sealing members 6 and 32, and in the sealing part, the outer tube is installed by the protrusion part. The end of the tube member touching the outer tube is installed in the tangential direction on the inside to the protrusion part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is provided with an outer tube having an inner tube that is hermetically sealed in a vacuum and extends in the longitudinal direction, the longitudinal axis is defined by the inner tube, the inner tube includes a light emitting means, and faces each other. Sealed by a sealing member at the end, the outer tube covers the entire inner tube together with at least one terminal tube member, and the tube member is an annular ring provided at the sealing member Relates to an electric lamp which is mounted by a raised part. In this case, for example, metal halide lamps and mercury high-pressure discharge lamps are targeted, but halogen incandescent lamps having outer tubes are also targeted. The inner tube of the lamp is sealed on two sides by sealing points. The outer tube is fixed at one or both sealing members.

  From EP-A 465 083 and EP-A 588 602 an electric lamp with an outer tube is already known, which has a light emitter surrounded by an outer tube, which is attached to a sealing member It has been. In this case, in order to form a good connection, the sealing member is provided with, for example, a radial bearing member, i.e. a bulge or a bead, on which the end of the outer tube abuts. In this case, it is melted together with this ridge.

  On the other hand, it is known from WO 95/32516, for example, to wind an outer tube directly on a sealing member without using any ridges.

  A lamp of the type mentioned at the beginning is known from US-B 6 790 115, according to which an extension of the discharge vessel sealing member is “scratched” on one side, An outer tube is attached.

The disadvantage of such a connection technique is that there is room for improvement in any case with respect to the intended strength for the connection between the outer tube and the sealing member. In addition, if a raised portion is not used, a time-consuming heat treatment process is required.
EP-A 465 083 EP-A 588 602 WO 95/32516 US-B 6 790 115

  Accordingly, an object of the present invention is to ensure a more reliable and load-resistant connection between the outer tube and the inner tube sealing member in the lamp according to the superordinate concept of claim 1.

  According to the present invention, the problem is that the cross section of the raised portion is a substantially convex shape with a top, and the tube member is near the top on the side of the raised portion that is oriented toward the light emitting means. It is solved by being attached to. Particularly advantageous embodiments are shown in the dependent claims.

  The electric lamp according to the invention has a vacuum-tight and sealed inner tube, for example a discharge vessel, which defines the longitudinal axis of the lamp, which inner tube is sealed by a sealing member at its opposite ends. It is sealed. The sealing member is a pinch sealing part or a melt sealing part. The light emitting means inside the lamp is a discharge arc or light emitter between the two electrodes. The light emitting means are conductively connected by an internal current introduction line guided there. For example, the sealing member is provided with an extension projecting outward, which is formed as a hollow tube.

  In this case, the at least one sealing member is provided with, for example, an annular ridge, which projects radially in a direction intersecting the lamp axis. The cross section of the raised portion is substantially convex. In other words, the ridge has a maximum height H with a vertex having a clear radius of curvature which occupies a significant portion of the ridge in the sealing member or its extension. In this case, the ridge has no inflection point and is therefore a pure convex curve, for example followed by a parabola, which has a distinct apex. Alternatively, the ridge has an inflection point, which is at a height Hw of at most 0.25H with respect to the maximum height H of the ridge apex. Such a ridge shape can be formed by compression or bulging after local heating. Even simpler is to install a properly formed glass bead.

  By providing such a shape, it is significantly easier to configure the outer tube to be positioned substantially axially in the vicinity of the apex inside the raised portion. In order to ensure this, the inner diameter of the outer tube end is selected to be smaller than the outer diameter of the raised portion. In that case, it is advantageous to make the outer diameter of the outer tube end portion approximately the same as the outer diameter at the apex of the raised portion. The outer diameter of the outer tube end can also be increased somewhat, for example up to 30%.

  The outer tube may be a continuous tube member having the same diameter, or may be a tube or valve having a bulge in the center and a tube member at the end.

  According to one advantageous embodiment, the sealing member is provided with a tubular extension, on which the ridge abuts. This is for example adhered or integrally formed. As a result, even in a pinch sealing portion that is not symmetrical in the radial direction, a bulging portion that is symmetrical in the radial direction can be formed. In the case of a melt-sealed part, the extension part as described above is not necessarily required. The inner tube and the outer tube are advantageously made of quartz glass or hard glass.

  In particular, the ridges can be made relatively small, in which case the outer diameter of the ridges is typically 25 to 80% larger than the diameter of the sealing member located below. A typical value for the diameter of the sealing member or its extension is 7 mm, and a typical value for the corresponding ridge outer diameter is 2 to 4 mm.

  According to one particular embodiment, it is advantageous if the ridge is hollow, whose maximum inner diameter is larger than the outer diameter of the surrounding sealing member. As a result, a convex shape of the raised portion that is particularly well suited for the close contact in the axial direction at the outer tube end is realized.

  In the case of the conventional shape of the ridges known for a long time, it is very difficult in the first place to install the outer tube in the axial direction, because the contact area is very short. Ignoring this point, according to the prior art, the outer tube is always attached completely outside at the apex of the ridge.

  Attaching the outer tube axially to the ridge significantly increases the resistance of the transition, up to 50%. In this case, a stress ring is no longer formed.

  The ridge can be formed from a sealing member, for example, by compression, or can be mounted thereon as a separate bead. In this case, the closer the contact between the outer tube and the raised portion, the greater the resistance to breakage.

  Note that according to one embodiment of the invention, the overlap is at least 50% of the wall thickness of the tube member.

  Next, the present invention will be described in detail based on a plurality of embodiments.

  FIG. 1 shows a side view of a halogen incandescent lamp pinched on two sides. This lamp is composed of an inner tube 1, and a light emitter 2 is arranged in the axial direction at a central portion 4 thereof.

  The end 5 of the illuminator 2 functions as an internal current introduction line, which is directly embedded in the pinch seal 6 and is connected to the pinch flake 7 there.

  The pinch sealing portion 6 has a tubular glass sleeve 11 as an extension member that can also serve as a socket component on the outside thereof, and the glass sleeve 11 is integrally formed at the pinch sealing portion. And has an outer diameter of 7 mm and an inner diameter of 5 mm. The length of the glass sleeve 11 is about 7 mm.

  Further, a supporting member, ie, a raised portion or a bead 12 is added to the outside of the glass sleeve 11 so as to cross the lamp axis, and this is formed into a substantially convex shape. Furthermore, the ridge 12 is in contact with the end of an outer tube 14 configured as a tube member 13, so that the outer tube extends between both ridges 12 on both sides of the central part 4. become.

  Furthermore, a base can be attached to one end of the sealing member as is known per se. At this time, the base has an electrical contact member (not shown), and this contact member emits light. It is electrically conductively connected to a current introduction line leading to the means, in which case the contact member is attached to the tubular extension of the sealing member.

  In FIG. 2, a metal halide lamp 25 is shown, which is sealed by the melting part 15. In this case, the tube member 13 terminates at the raised portion 12, and the raised portion is formed at the extended portion 16. This is because in this case, a minimum material may be formed.

  In FIG. 3, an example of the shape of the raised portion 12 is depicted in a cross-sectional view. The shape is convex, for example, parabolic. The top S defines the height H of the raised portion above the level of the support member or sealing member 11. The curved portion is continuously convex. As an alternative to this, the cross section of the ridge 20 shown in FIG. 4 is substantially convex, but has widened legs to better adhere to the sealing member. . In that case, the leg position is concavely curved over a short section, and in this case, the inflection point WP is at a height Hw of 25% at the maximum of the height H of the apex S above the level of the sealing member 11. is there. Here, advantageously, the radius of curvature at the apex S is minimal compared to any other part of the convex region.

  A partially enlarged view of the lamp depicted in FIG. 5 shows a solid ridge 12 that can be arranged as a glass bead. The outer diameter DW of the raised portion (as measured from one top to the other) is significantly larger than the inner diameter DU of the tubular end 13 of the outer tube 14. The difference is typically 1 to 3 mm. The wall thickness of the end 13 having the thickness DK is usually about 2 to 4 mm. On the other hand, the outer diameter AD of the tubular end portion 13 is substantially equal to the maximum outer diameter DW of the raised portion 12, or typically larger or smaller up to 0.5 mm. Such an arrangement ensures a contact area KZ that is as long as possible between the end 13 and the raised portion 12.

  In actual use, it has been found that the contact resistance between the ridges 12 and the outer tube 14 is as great as possible, especially as long as possible in the axial direction. It is. For this reason, the raised ridges as shown in FIGS. 3 and 4 are very advantageous, because with such a ridge 20 the axial length of the contact area is great. This is because the length KZ of the contact area in the axial direction is significantly longer than the shape of the ridges that are mostly concave, as is usual. A feature of this type of convex ridge is that, particularly in the case of a hollow ridge 20, the inner diameter IDW of the ridge is significantly larger than the inner diameter ID of the sealing member surrounding it. However, it is the external shape as described above that is functionally important. Whether the ridge is solid or hollow is secondary.

  The axial length KZ should preferably be at least 2 to 4 mm. The outer tube 14 is always arranged in the inner half of the ridge facing the discharge side, which is located as far as possible in the upper peripheral edge, where the curvature is the smallest and therefore the contact area is the least. It is getting bigger. Ideally, the tube member is mounted such that its end is positioned approximately tangentially at the top inside the ridge. This is because the axial length KZ is the longest.

  Similar to that shown in FIG. 1 of US-B 6 790 115, the shape of the ridge according to the invention can also be used only at one end for outer tube attachment. According to the present invention, the overlap is at least 50% of the wall thickness of the tube member 13.

Side view of halogen incandescent lamp Side view of an embodiment of a metal halide lamp Diagram showing the parameters forming the basis of the first embodiment of the ridge The figure which shows the parameter which forms the foundation of 2nd Example of a protruding part Sectional view showing details of connection between solid ridge and outer tube Sectional view showing details of connection between hollow bulge and outer tube

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner pipe | tube 2 Light-emitting body 5 Light-emitting body edge part 6 Pinch sealing part 7 Pinch thin piece 11 Sealing member 12 Raised part 13 Tube member 14 Outer pipe 15 Melting part 16 Extension part

Claims (12)

An outer tube having an inner tube (1) that is hermetically sealed in a vacuum and extends in the longitudinal direction;
A longitudinal axis (A) is defined by the inner tube (1), the inner tube (1) includes a light emitting means, and is sealed by a sealing member (6; 32) at opposite end portions,
The outer tube covers the entire inner tube (1) together with at least one terminal tube member (13);
The tube member (13) is an electric lamp attached by an annular ridge (12) provided at a sealing member,
The cross section of the raised portion (12) has a substantially convex shape with a top (S), and the tube member (13) is oriented toward the light emitting means at the raised portion (12). An electric lamp characterized in that it is mounted near the top on the side. The lamp of claim 1, wherein
The lamp having a maximum diameter (DW) of the raised portion (12) is larger than an inner diameter (ID) of the tube member (13). The lamp according to claim 2, wherein
The outer diameter (AD) of the tube member (13) substantially matches the maximum diameter of the raised portion. The lamp of claim 3,
The lamp is characterized in that the overlap is at least 50% of the wall thickness of the tube member (13). The lamp of claim 3,
The lamp is characterized in that the two values are separated from each other by a maximum of 1.5 mm. The lamp of claim 1, wherein
The lamp is characterized in that the raised portion (12) is arranged in a tubular extension of the sealing member. The lamp of claim 1, wherein
The said sealing member is a fusion | melting sealing part, for example, the said protruding part is attached to this fusion | melting part directly, The lamp | ramp characterized by the above-mentioned. The lamp of claim 1, wherein
The said sealing member is a pinch sealing part, The cyclic | annular extension part is attached to this pinch sealing part on the outer side, for example, the said protruding part is attached to this extension part directly, The lamp | ramp characterized by the above-mentioned. The lamp according to claim 8,
The ridge (12) is hollow and has an inner diameter (IDW) larger than an inner diameter (ID) of the extension. The lamp of claim 1, wherein
The raised portion (12) is formed in a completely convex shape, or convex so that an inflection point that occurs in some cases is located at a height of 20% at the maximum of the height of the top portion (S). A lamp characterized by being formed into a shape. The lamp of claim 1, wherein
An end portion of the tube member is attached in a substantially tangential direction at an apex (S) inside the raised portion. The lamp of claim 1, wherein
The lamp is characterized in that the raised portion is formed by a separate glass bead.

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