JPH0735298Y2 - Lamp with base attached without cement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a lamp having a base attached without using the bonding agent according to the general concept of claim 1.

PRIOR ART Lamps of this type are particularly suitable for mounting in reflectors such as motor vehicle headlights.

Known lamps of this type use, for example, a two-part base whose base insulation is made of synthetic resin (West German Utility Model No. 8201536). The metal base sleeve is held within the base insulator housing.

The base insulator, however, is very complicated and is therefore difficult to manufacture.

From German German Utility Model No. 8104771 is known a vehicle mounted lamp with a two-part base whose base insulator is made by ceramics. The fixing between the two base parts is carried out by riveting, but this allows a large amount of play and additionally requires additional parts. The optical quality of the headlight, however, depends decisively on the quality of the fixation. The fixation must not allow play to avoid disturbing the alignment of the lamp with respect to the headlight focus.

The problem to be solved by the invention is to provide a lamp with a two-piece base, which is characterized by a particularly simple and play-free connection between the two base parts.

Means for Solving the Problems The above problems are solved by the features described in the characterizing part of claim 1. Other advantageous embodiments of the invention are described in the other claims.

Advantages of the Invention The special advantage of the invention is that the connection between the two base parts is
It is about saving material and being able to manufacture quickly. Further, the present invention has a feature of high position adjustment accuracy which is increasingly required in the current headlights. Moreover, this connection compensates for the large tolerances of the base parts during installation. These properties are especially important when the base insulation is made of ceramic, because ceramic parts are significantly more than synthetic resin parts (with a typical tolerance of about 0.05 mm). This is because it has a high tolerance (about 0.4 mm). Furthermore, the curing of the material is of particular importance here because the ceramic components are sensitive to impact loads. It is therefore possible to use the advantages of the ceramic base parts for lamps requiring maximum alignment accuracy, using a new and simple connection technique. In particular, the use of ceramics improves the evaporation properties and the temperature is reduced by better insulation. In the case of the use of synthetic resin parts, coating formation on the reflector must be avoided by costly post-heating or cleaning.

Moreover, this simple connection type provides sufficient space for the base and thus allows the use of round plugs instead of flat plugs (contact blades). This makes it possible in particular to produce splash-tight specifications by casting.

EXAMPLE The halogen incandescent lamp with a power consumption of 50 W shown in FIGS. 1 and 2 is a so-called type H7 lamp in which the type H1 lamp is replaced for a specific purpose. These lamps are commonly used as separate upper beams in automobile headlights. The cylindrical single-ended hard glass bulb 1 is filled with an inert gas and a halogen additive, and has an axial coil 2 supported by two lead wires which are sealed in the stem sealing portion 3. I have it. The stem sealing portion 3 is surrounded by a metal holding member 4. As is known, the retaining member 4 comprises two shell halves 5 each having a strap 6 formed on each tube side which transitions to an apron 7 facing away from the tube.
Consists of. The end 8 of the apron 7 which extends in the shape of a conical jacket contacts the metal sleeve sleeve 9 formed as a hollow cylinder inside and is joined to the sleeve sleeve 9 by laser welding L. The advantage of the laser welding L is that no moment is generated at the welding portion during the welding process, and thus the position adjustment accuracy is not impaired. The base sleeve 9 is further provided with an adjusting ring 10 at the end closer to the tube, the adjusting ring 10 having a number of notches and projections 11 as an aid for correct position adjustment (Fig. 3a). , 3b
Figure). At the end remote from the bulb, the base sleeve 9 is provided with a narrow collar 12 which is curved inward.
Both the adjusting ring 10 and the collar 12 which circulates completely around each lie in a plane transverse to the lamp axis. Starting from the collar 12, the base sleeve 9 is formed with two lugs 13 located opposite each other. Rug 13
Starting from collar 12 only 90 ° (18 on the basis of the hollow cylinder)
It is bent back inward once (only 0 °) and ends slightly below the height of the adjusting ring 10. End 14 of each lug 13
Is formed on the scissors portion of the reverse hook, and the scissors portion is divided into one central portion 15 and two outer protrusions 16. The outer protrusion 16 projects starting from the end 14 of the lug and is approximately half the length of the lug 13.
Have returned to.

Inside the base sleeve 9, a ceramic base insulator 17 (made of steatite) having a substantially solid cylindrical shape (see FIG. 4) is fitted. The base insulator 17 is
It has two renal notches 18 laterally to provide space for the end 8 of the apron 7. Of the base insulator 17,
The groove 19 provided on the peripheral edge of the end far from the tube is
The play-free abutment of the base sleeve 9 on the collar 12 is ensured.

The base insulator 17 is further fitted with both lugs 2
It has one slotted slit 20 penetrating therethrough. On the tube side, the slotted slit 20 communicates with two semicircular cutouts 21 in which the lug 13 terminates. The base insulator 17 is held on the base sleeve 9 by a cross-twist formed by twisting the end 14 of the lug. The twisting results in a "shortening" of the effective length of the lug 13. High tolerances in the thickness of the ceramic base insulator 17 are compensated for during twisting, since the twisting always takes place at the bottom 22 of the semi-circular cutout 21, which is a tolerance compensation. Very important. The forking of the lug end 14 in this connection provides better play elimination and a more effective tolerance compensation action, since the outer protrusion 16
The reason is that in the contraction caused by the twist in the bottom surface portion 22, it spreads like an inverted swastika. Compensation for different tolerances is done with different spread angles.

The base insulator 17 further has two axial holes 23. Hole
Two metal pipes are provided as a round terminal 24 in 23 and are riveted by expanding the upper end of the round terminal 24. Some distance from the top, round terminal 24
The recessed portion 26 of the end portion 17 of the portion 17 remote from the tube is provided with a circumferential raised portion 25 that acts as a stopper.
The use of round terminals in combination with cross-twisting to save space is preferred over flat terminals because a better contact connection to the plug is made at the socket side. Further, the lead wire 27 can be easily fixed. The lead wire 27 comes from the stem sealing part and is bent toward the round terminal 24, and the inner hollow chamber 28 is tapered in the diameter direction of the lead wire 27. Is welded to the end of.

The invention is not limited to the illustrated embodiment.

In another embodiment, the base insulator comprises synthetic resin.
In this case, it is especially recommended to attach the heat load of the base to the holding member by means of two heat shields, which are shaped like butterfly wings. The semicircular cutout portion of the base insulator 17 is unnecessary when the height of the base insulator 17 is reduced.

Another embodiment is especially protected against splashes of water and the like, the side of the base remote from the bulb is additionally covered and sealed with a sprayed synthetic resin.

The lamp is manufactured in the following order. First of all, a round terminal is provided in the base insulator and is riveted by widening its upper end. The base sleeve is then cross-twisted with the base insulator.

In parallel with this, a holding member is attached to the bulb.

These two assembled units are loosely integrated,
The lead wire is passed through the round terminal. The position of the lamp is adjusted in three dimensions. The holding member is then welded to the base sleeve, in which case the use of a laser ensures that the misalignment never happens.

[Brief description of drawings]

FIG. 1 is a side view of a halogen incandescent light bulb for a vehicle headlight. However, the base portion is shown as a sectional view.
FIG. 2 shows a side view of the halogen incandescent lamp of FIG. 1 rotated 90 °, and FIG. 3a shows a plan view of the base sleeve before assembly of the light bulb of FIG. FIG. 3b shows a longitudinal sectional view of the base sleeve, FIG. 4a shows a plan view of the base insulator of the light bulb of FIG. 1, and FIG. 4b shows a side view of the base insulator. 1 ... Hard glass tube, 2 ... Axial coil, 3 ...
Stem sealing part, 4 ... Holding member, 5 ... Shell half part, 6
...... Strap, 7 ... Apron, 9 ... Clasp sleeve, 10 ... Adjustment ring, 12 ... Color, 13 ... Lug, 15
...... Center part, 17 …… Insulator base, 18 …… Notch part, 19 ……
Grooves, 20 ... Slotted slits, 21 ... Semi-circular cutouts, 22 ...
… Bottom part, 24 …… Round terminal, 25 …… Protruding part, 26 …… Concave part, 27 …… Lead wire, L …… Laser welding.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Valter Schiehnhel Germany Gingen Bergstraße 25

Claims (6)

[Scope of utility model registration request] 1. A single-ended glass bulb (1) having at least one light-emitting body (2), a lead wire (27) pulled out from a stem sealing portion (3) and guided, and a metal sleeve. (9) and a cap insulator (17), and at least a base fixed to the base and electrically connected to a lead wire, the base being attached without using a bonding agent. In the lamp, the base sleeve (9) is formed with two lugs (13) located opposite each other at the end remote from the bulb and bent back inward by 180 °. It is configured as a hollow cylinder, and the base insulator (17) is provided inside the hollow cylinder as a solid cylinder, and the base insulator (17) has two elongated slits (20) passing therethrough. And has a mouthpiece inside the long slit (20). The lug (13) of the leave (9) is fitted, and the ends (14) of the two lugs (13) extend beyond the slit (20) and are twisted. A lamp with a base attached without using a bonding agent. 2. Two slotted slits (20) flared in the two notches (21) at the end closer to the bulb, the end (14) of the lug (13). A lamp with a base without a cement according to claim 1, characterized in that the screw is twisted in the region of the cutout (21). 3. The end portion (14) of the lug (13) is branched into a central portion (15) and two outer protrusions (16) in a fork shape, and the end portion of the outer protrusion (16) is A lamp without a bonding agent according to claim 1 or 2, characterized in that it diverges at the end face of the base insulator (17) located opposite them. 4. A lamp without a bonding agent according to claim 1, characterized in that the base insulator (17) is made of ceramic. 5. The base of the base sleeve (9) has a hollow cylinder extending laterally with respect to the axis of the cylinder and curved toward the inside at the end remote from the tube, and the base insulator (17). )
Characterized by having a collar (12) to be mounted,
A lamp having a base attached without using the bonding agent according to claim 1. 6. The bonding agent-free according to claim 5, characterized in that the base insulator (17) has a circumferential groove (19) in which a hollow cylindrical collar (12) is fitted. A lamp with a base attached to it.