EP1009013A2 - Lamp with uncemented base - Google Patents

Abstract

One end of glass bulb is sealed by pinched section (2) which has socket attached to it by metal spring. Socket has slot (7) loosely fitted to seal. Spring is U-shaped and grips seal, with one spring leg (12) parallel to longitudinal axis of bulb and having lateral expansion and tensioned by slot.

Description

Technical field

The invention is based on a lamp, in particular a high-pressure discharge lamp, according to the preamble of claim 1. It is in particular around metal halide lamps, high pressure sodium lamps or halogen incandescent lamps one-sided crushing and ceramic base, but also with incandescent lamps conventional screw base.

State of the art

A high-pressure discharge lamp is already known from EP-A 261 722, in which the base is attached to the outer bulb with putty. This technique is time, energy and Material-intensive, because the putty has to be heated out for a long time and additionally an inner part (steel band) is used for inductive heating. In addition Problems arise under high loads because cracks can form in the putty and Harden areas of the putty differently. Finally it turned out that when installing these lamps in special lamps so high temperature load. stungen can arise that there can occur tropical-like conditions, who are not up to the usual putty. Furthermore, it has been shown that the Common putty is sensitive to extreme environmental conditions. For example it tends to corrode in salty or sulphurous air.

On the other hand, for incandescent lamps that are operated with low voltage, they are putty-free supported base known (EP-A 668 639), in which a metal spring on the broad side the bruise is caught. A reliable mounting takes place here by snapping the metal spring into a projection or a recess on the Bruise.

Presentation of the invention

It is an object of the present invention to provide a lamp according to the preamble of To provide claim 1, which is easy and quick to manufacture and high loads withstands.

This object is achieved by the characterizing features of claim 1. Particularly advantageous configurations can be found in the dependent claims.

Basically, the lamp according to the invention has a glass bulb, which has a longitudinal axis and is usually closed by a pinch is. This bulb is often the outer bulb of a discharge lamp or a halogen incandescent lamp made of quartz glass or tempered glass. He can also be the only bulb of a discharge lamp or incandescent lamp.

Normally, two power leads are routed to the outside of the pinch and also fastened a base by means of a metal spring (preferably made of spring steel). The base has a trough-shaped receptacle that is loosely adapted to the crushing. The metal spring is bent in a U-shape. It consists of a base part and two legs that grip the bruise. The attachment of the base on Piston is mediated by a double spring action of the spring. this happens in particular in that at least one, preferably two, legs essentially is aligned parallel to the longitudinal axis, but at the same time a spring force has accessible transverse expansion, the leg in the receptacle of the Base is housed and there in its transverse extension through the walls of the Recording is limited and is therefore under tension.

The metal spring is a stamped sheet metal part or the like, which is bent into a U. During installation the metal spring is first pushed onto the pinch. It stops there particularly good if the contact surface (mostly on the broad side, but also the Narrow side is possible) has a ribbed structure. The distance should also be between the two legs before installation in the base slightly lower (in particular about 5 to 10%) than the assigned pinch thickness. Consequently sufficient provisional hold of the metal spring on the pinch is created.

The largest transverse extension of the metal spring, i.e. the distance between them most distant parts of the two legs, at this time, So before installing the base, slightly larger than the assigned width the inclusion in the base. The transverse expansion of the metal spring is advantageous by approx. 5 to 20% larger than the transverse extent (i.e. the width) of the socket.

With usual dimensions, this corresponds to a transverse expansion of the metal spring, which is about 0.3 to 1 mm larger than the transverse extension of the socket base is.

A simple realization of the double spring action is that at least a leg, preferably in the direction of the transverse extent, trough-shaped, in particular is V-shaped in cross-section, bent inwards or outwards. The voltage the gutter conveys the spring effect after installation of the base. The However, the gutter can also be rotated by 90 °, ie aligned in the direction of the longitudinal axis his.

The metal spring is advantageously constructed so that it has two symmetrical legs owns. This halves the spring travel to be covered by each leg, whereby the material is used less. It also makes it symmetrical Placement of the piston in the base with respect to the longitudinal axis guaranteed.

In a second embodiment, the legs are asymmetrical, with only one Leg is channel-shaped, while the second leg with lateral Ends that are curled. They serve for an exact lateral fixation.

The base part of the metal spring advantageously runs at a distance from the power supply lines in the middle between the two power leads. This distance comes special Significance in high-pressure discharge lamps, in which an ignition voltage of several kV may be required. Therefore, is a special in these cases narrow base part to use to prevent arcing between a power supply and to avoid the base part. It is beneficial if the distance of the base part is too each power supply is at least 3 mm.

With regard to a high ignition voltage, as is the case with immediate re-ignition is required is also a minimum distance between the legs of the power supply to watch out for. This is especially important for thighs, in which part of it all the extension, about as wide as the broad side of the bruise, one Role. The lower edge of the extension is preferably at least 2 mm from here the power supply lines spaced. Because a rollover should also go in this direction be avoided. If possible, at least 1 mm air gap. This means that the bottom edge of the attachment is not direct abuts the bruise, but is spaced from its broad side.

It must also be taken into account that for the safety of the customer, protection against accidental contact should be optimized when installing the lamp. This is achieved by that the free outer end of the leg in the receptacle is at least 2 mm ends below the top edge of the base.

The fastening technology presented here has a very special advantage the base of new metal halide lamps with ceramic discharge tubes as well as high pressure sodium lamps. Because here the discharge vessel is closed on both sides for technical reasons, these lamps have an unusual large ratio of length to diameter of the outer piston. While in conventional metal halide lamps this ratio is about 2: 1 to 3: 1 ceramic metal halide lamps (and high pressure sodium lamps) possibly a length to diameter ratio greater than 3: 1. It has emphasized that when installing these lamps in the corresponding version (or Lamp) the tendency to jump in the pinch of the outer bulb considerably increases when the base is fixed with putty. The cause is that the putty is a rigid connection between the outer bulb and base mediated. Already a small one Vibration excitation (as can arise when installing the lamp) is sufficient to put excessive stress on the outer bulb since it discussed in the above Ratio of more than 3: 1 has an unfavorable resonance of the natural vibration. With a cementless base with the metal spring according to the invention however not an absolutely rigid connection between base and piston. The vibration on the contrary, it is cushioned and damped by the metal spring, so that the risk of glass breakage has been eliminated. On the other hand, the previously known cementless base, ie without the metal spring according to the invention, not sufficient Fixation can be achieved. When installing in a reflector was therefore the optical quality unsatisfactory. This problem has now been solved.

characters

Figur 1

eine Metallhalogenidlampe, teilweise im Schnitt, in Seitenansicht (Figur 1a), in um 90° gedrehter Seitenansicht (Figur 1b) und in Draufsicht von unten (Figur 1c);

Figur 2

die Metallfeder aus Figur 1 in drei verschiedenen Ansichten (Figur 2a bis 2c) entsprechend Figur 1;

Figur 3

ein weiteres Ausführungsbeispiel einer Metallhalogenidlampe, teilweise im Schnitt, in Seitenansicht (Figur 3a), in um 90° gedrehter Seitenansicht (Figur 3b) und in Draufsicht von unten (Figur 3c);

Figur 4

die Metallfeder aus Figur 3 in drei verschiedenen Ansichten (Figur 4a bis 4c) entsprechend Figur 3.

The invention will be explained in more detail below with the aid of several exemplary embodiments. Show it:

Figure 1

a metal halide lamp, partially in section, in side view (Figure 1a), in 90 ° rotated side view (Figure 1b) and in plan view from below (Figure 1c);

Figure 2

the metal spring from Figure 1 in three different views (Figure 2a to 2c) corresponding to Figure 1;

Figure 3

a further embodiment of a metal halide lamp, partly in section, in side view (Figure 3a), in 90 ° rotated side view (Figure 3b) and in plan view from below (Figure 3c);

Figure 4

3 in three different views (FIGS. 4a to 4c) corresponding to FIG. 3.

Description of the drawings

A metal halide lamp with an outer bulb 1 is shown in FIG Tempered glass (or quartz glass) that has a longitudinal axis and one side through a well-known double T-shaped (sometimes also called L-shaped) pinch 2 closed is. The length L of the outer bulb is 6 cm, the outer diameter is D. 2.2 cm, the ratio L / D = 2.7. At the pinch 2 there are two power supplies 3 led to the outside. They end in pins 4, which are in a ceramic base 5 are used. A discharge vessel 10 is squeezed on one side in the outer bulb made of quartz glass with a filling of metal halides.

The base 5 is attached to the pinch 2 by means of a metal spring 6. The base 5 has a trough-shaped, loosely adapted to the pinch 2, approximately rectangular Recording 7 with indentations 21 on the broad sides. The metal spring 6 is U-shaped bent. It consists of a base part 11 and two free legs 12, 13, which together encompass the bruise. The base part 11 is at the bottom End of the pinch 2, while the legs 12, 13 rest on the broad sides 8. The broad sides 8 of the bruise 2 are over a large part of their area corrugated (only partially shown under reference number 14). The width of the base part 11 corresponds to approximately one third of the distance between the power supply lines 3.

In Figure 2, the metal spring 6 is shown again in detail in different views. It consists of spring band steel with a thickness of 0.3 mm. The first, narrow leg 12 is trough-shaped inwards transversely to the longitudinal axis, that is to say second leg, bent. The channel 15 forms two legs 15a, 15b the shape of a V (or U). Your inner leg 15b is over with the base part Attachment 16 connected. The second, wide leg 13 of the metal spring is T-shaped constructed so that a widened surface 18 on a narrow neck 17 sits. The side ends 19 of the surface 18 are rolled into a three-quarter circle. she fit exactly into the space between the widened narrow sides 20 the pinch and the central indentation 21 on the broad side of the base (Figure 1c). As a result, the metal spring 6 is centered exactly in the center.

The attachment of the base is mediated in that the leg 12 with his Channel 15 in the narrow gap 22 between the recess 21 of the receptacle and the pinch 2 is clamped.

FIG. 3 shows a metal halide lamp with an outer bulb 22 Quartz glass (or tempered glass) that has a longitudinal axis and one side through a Pinch 2 is closed. The length L of the outer bulb is 7.5 cm, the outer diameter D is 1.8 cm, the ratio L / D = 4.2. At the bruise 2 are again two power leads 3 led out to a ceramic base 5. A ceramic double-ended discharge vessel 23 is also in the outer bulb a filling of metal halides used.

The base 5 is attached to the pinch 2 by means of a metal spring 26. The Socket 5 again has a squeeze 2 loosely adapted, approximately rectangular Recording 7. The metal spring 26 is bent in a U-shape. It consists of one Base part 31 and two free, symmetrically constructed legs 32. The base part 31 rests on the lower end of the pinch 2, while the legs 32 the pinch reach around. The width of the base part 31 is 5.5 mm and corresponds at least a third of the distance between the power supplies 3. The distance the base part of each power supply is 3 mm. The width of both legs is 32 only a little narrower than the broad side of the socket. The thighs are bent in a channel-like manner transversely to the longitudinal axis, i.e. towards the bruise.

In Figure 4, the metal spring 26 is shown again in detail. It consists of spring steel with a thickness of 0.2 mm. The trough 35 forms from two legs 39a, 39b roughly the shape of a V (or U). The two gutter legs 39a, 39b are however asymmetrical, since they are of different lengths and angles to the Are longitudinal axis. The outer leg 39a forms a first angle of 45 ° to the Longitudinal axis, while the inner leg 39b is angled only about half as much (second angle of 23 °). This is because the outer leg is the real one Holds and therefore requires a higher spring force than the inner one Leg, whose task is the centering of the piston and protection against tilting is. Accordingly, the first angle should preferably be chosen between 35 ° and 55 °, while the second angle is between 15 ° and 35 °. The first angle is advantageously larger (by at least 20%) than the second, a ratio is preferred of about 2: 1.

The inner gutter leg 39b is connected to the base part 31 via an extension 36 connected. The extension 36 is constructed so that 37 on a narrow neck a widened surface 38 sits so that it is approximately T-shaped overall. The widened Surface 38 is bent approximately 45 ° to the outside on the inside of the gutter. The lower edge of the crossbar of the T (surface 38) is spaced about 1 mm from the broad side of the pinch and a total of about 2.5 mm from the power supply 3 removed to avoid sparking during ignition. The gutter 35 is approximately as wide as the widened area 38, that is, the crossbar of the T, the extension piece 36.

The attachment of the base is mediated by the fact that the two channels 35 in the narrow gap 29 between the indentation 28 of the receptacle and the pinch 2 are clamped.

The smallest distance between the two legs 32 is relaxed Condition 3.15 mm (see Figure 4a). The distance at the seams between Extension 36 and inner gutter leg 39b is 6.0 mm. Between free ends of the outer legs 39a of the channel, the distance is even 6.2 mm. The legs 39a, 39b are therefore not only asymmetrical, the outer leg is also spread further so that a stronger spring force can act here.

In contrast, the width of the pinch (including corrugation 14) is measured on the broad sides, approx. 3.3 mm. The width of the socket in the base The area of the indentation 28 is approximately 5.9 mm.

The safety against contact is ensured by the distance between the free end of the leg to the upper edge 40 of the base is 2 mm.

Claims (14)

Lamp with a bulb (1; 22) made of glass, which has a longitudinal axis and is closed on one side by a pinch (2), being on the pinch (2) two power leads (3) are led to the outside and at the pinch (2) is fastened to a base (5) by means of a metal spring (6; 26), characterized in that the base (5) one of the pinch (2) loose has adapted receptacle (7), and that the metal spring (6; 26) bent into a U-shape and consists of a base part (11; 31) and two legs (12, 13; 32), which encompass the pinch, the attachment of the base (5) is conveyed in that at least one leg (12; 32) essentially is aligned parallel to the longitudinal axis, but at the same time a spring force has accessible transverse extent, this leg in its transverse extent is put under tension by the receptacle (7) of the base. Lamp according to claim 1, characterized in that the transverse extension of the leg (12; 32) accessible by spring forces before the base is installed by about 5 to 20% larger than the transverse extent of the admission of the Base is. Lamp according to claim 1, characterized in that the transverse extension of the leg (12; 32) accessible by spring forces before the base is installed 0.3 to 1 mm larger than the transverse dimension of the holder of the Base is. Lamp according to Claim 1, characterized in that the spring forces are accessible Leg (12; 32) is shaped as a groove (15; 35), and in particular is bent in a V or U shape in cross section. Lamp according to claim 4, characterized in that the groove (15; 35) is connected to the base part (31) via an extension piece (36). Lamp according to claim 1, characterized in that the metal spring (6; 26) has two symmetrical legs (32) that are accessible to both spring forces are. Lamp according to claim 1, characterized in that the smallest distance between the two legs (32) before sliding on the metal spring the bruise is about 5 to 10% smaller than the width of the bruise. Lamp according to claim 1, characterized in that the second leg (13) the metal spring is used for lateral centering by its lateral Ends (19) are particularly curled. Lamp according to claim 1, characterized in that the base part (11; 31) spaced from the power supply lines (3) in the middle between the two power supply lines (3) runs, the distance of the base part to each power supply in particular is at least 3 mm. Lamp according to claim 1, characterized in that each leg at least 2.5 mm from the power supply lines (3). Lamp according to claim 1, characterized in that the lower edge of the Leg is spaced from the bruise, with at least one air gap of 1 mm width remains. Lamp according to claim 1, characterized in that the bulb (1; 22) of the Lamp has a length to diameter ratio of at least 3: 1. Lamp according to claim 1, characterized in that the broad sides (8) of the Pinch have a ribbed or corrugated structure (14). Lamp according to claim 1, characterized in that the free end of the both legs (12, 13: 32) of the metal spring each at least 2 mm below the upper edge (40) of the receptacle (7) of the base ends.

Images