DE8812466U1 - Socket for a single-ended high-pressure discharge lamp - Google Patents

Description

Patent Trust Company

for electric light bulbs mbH., Munich

Socket for a single-ended high-pressure discharge lamp

The invention relates to an object having the features specified in the preamble of the main claim.

Such a socket is known, for example, from DE-OS 31 36 462. The socket body showed due to its large mass and the many surfaces accessible to the radiation emitted by the lamp a relatively high heating, which in turn had a negative impact on the service life of the lamp.

For the same lamp type, a differently designed socket body has therefore been proposed in DE-OS 34 12 461, which no longer has these disadvantages.

With the reduction of the power consumption of such lamps, the object of the present invention is to create a socket with the smallest possible dimensions for a single-ended and hot-ignitable metal halide high-pressure discharge lamp in an axial burning position. The socket should have as symmetrical a design as possible for installation in small lamps with an optical system and should be protected against contact and spray on all sides due to the high voltage that has to be applied during hot ignition.

This task is performed for a version of a high-pressure

discharge lamp of the type described at the beginning is solved by the features of the characterizing part of the main claim. The further design of the socket is described in the subclaims. The circular cylindrical shape of the socket represents an extremely compact design, which is further supported by the lead wires for the ignition and supply voltage that lead out downwards, i.e. on the side facing away from the plug-in area with the lamp.

The symmetrical internal structure of the socket body is just as compact, with the individual chambers containing the contact elements being enclosed on three sides by an approximately "H"-shaped cavity, which contains the appropriately shaped base of a metal halide lamp.

'5 high-pressure discharge lamp, thus making the socket/lamp system suitable for hot ignition up to 20 kV.

When installing the socket, neither rivets nor other metal fastening parts are used for fastening. This increases the protection against contact. The contact elements are simply pushed into their assigned chamber, with the connecting cables attached to the contact elements being guided through the openings facing away from the plug-in area. By closing the chambers using the covers, the contact elements are automatically adjusted and fixed, as their upper area protrudes into the recess in the covers facing the chamber. This ensures that they can be inserted and contact is made with the lamp base. The covers themselves are attached above the chambers using a suitable putty or adhesive. On the side of the covers facing away from the chamber, there is another recess into which a correspondingly shaped counterpart can be inserted.

dts lamp base fits snugly. This feature also increases the protection against contact by overlapping the socket and base in the plug-in area and extends the path against high-voltage flashovers to the outside. The

The glued-in covers are partially covered by the attached lamp base so that they cannot fall off in the event of a possible faulty bonding. The positioning bead is on the

The socket is arranged in the cavity of the "H" separating the chambers and fits snugly into a groove on the lamp base, so that incorrect polarity of the lamp is impossible. Due to the arrangement of all design features inside the socket, it has no assembly joints, holes or the like leading to the outside. This prevents the high voltage from spraying outwards. Due to the overall symmetrical, small design of the socket body, it is particularly suitable for small lamps, e.g. for film or recording lamps, since only a correspondingly small cut-out is required in the lamp's reflector.

The invention is explained in more detail below with reference to five schematically illustrated figures. Show

Figure 1 shows an assembled socket body in section 30

Figure 2 shows an unassembled socket body in plan view

Figure 3 a version in the main view

Figure 4 a version in side view and

Figure 5 shows a detail of the assembled contact elements with an indicated part of a lamp base

The socket 1 in Figure 1 consists of a socket body 2 made of ceramic as well as the two covers 3, also made of ceramic, the contact elements 4, 4' and the connecting cables 5.

The socket body 2 and the parts 3 to 5 functionally connected to it are now explained in more detail with reference to the other figures 2 to 5. The socket body 2 has a circular shape in plan view. The slots 6 and the holes serve to attach the socket body 2 in a lamp or to attach other objects, such as clamps, etc., and do not play a significant role in the proper functioning with the base of a metal halide high-pressure discharge lamp.

The internal construction of the socket body 2 is essentially symmetrical. The two opposing cylindrical chambers 9, 9' are separated from one another by an H-shaped cavity 10. Each of the chambers 9, 9' nestles into one half of this "H" so that it is surrounded by the cavity 10 on three sides. This H-shaped cavity 10 is filled with similarly shaped webs when a correspondingly shaped base is inserted so that the distance between the contact elements 4 is extended and thus an effective high-voltage resistance is ensured. The chambers 9, 9 ^' are designed according to the

The side facing away from the plug-in area is provided with openings 11 through which the connecting cables 5 are guided and electrically connected to the contact elements 4, 4 ^' arranged in the chambers 9, 9', e.g. by means of a crimp or welded connection. Within each chamber 9, 9' a shoulder 12 is provided on which the lower, flat end of each contact element 4 rests.

Furthermore, each chamber 9, 9' is closed with a cover 3, which is fastened within the socket body 2, for example by means of a suitable adhesive or ceramic cement (not shown). On the side of each cover 3 facing the chamber 9, 9 ^' a recess 13 is provided in which the upper ends of the contact elements 4, 4' end and through which they are adjusted and fixed. A separate fastening device for the contact elements 4, 4' can therefore be omitted, since these are automatically connected to the closing the chambers 9, 9' by the covers 3 In addition, the covers 3 each have a further recess 14 on their sides facing away from the chambers 9, 9'. The recesses 14 fit snugly into the projections 15 formed on the lamp base 8 to be inserted. The recesses 13 and 14 of each cover 3 are connected by an opening 16, under which the precisely positioned contact element 4, 4' is arranged and through which a contact pin 17 of the lamp base 8 in the chamber 9, 9' is introduced and establishes the electrical contact.

The neutral conductor is connected to the contact element 4'. For correct polarity of the lamp, the H-shaped

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ft · 4

A centrally arranged positioning bead 18 facing the other chamber 9 ¹ is formed on the wall of the chamber 9 facing the cavity 10. The lamp base 8 belonging to the socket 1 has a matching, concave groove at this point.

As described, the measures taken in the plug-in area of the socket 1 engage with correspondingly adapted counterparts of an associated lamp base 8 and thus ensure the hot ignition of the Metal halide high pressure discharge lamp requires high voltage strength of at least 20 kV.

What

Claims (5)

Protection claims 1. Socket (1) for a high-pressure discharge lamp with a single-ended base without an envelope bulb, comprising a socket body (2) made of a heat-resistant, electrically insulating material, which has at least two separate chambers (9, 9'), in each of which an electrical contact element (4, 4 ¹ ) is arranged, and the chambers (9, 9 ¹ ) are closed by covers (3), wherein for each chamber (9, 9 ¹ ) an opening (11, 16) is provided for a connecting cable (5) of a supply voltage and for access to a contact pin (17) of a lamp base (8), characterized in that the socket body (L) has a circular-cylindrical shape with a closed outer surface and the two chambers (9, 9 ¹ ) are separated from one another by an H-shaped cavity (10) which is located within the socket body (2) and which is designed to accommodate the Lamp base (2) is provided, wherein the two parallel sections of the cavity (10) at least partially surround the chambers (9, 9 ¹ ) on their respective opposite sides and the piece of the H-shaped cavity (10) connecting the parallel sections is arranged between the two chambers (9, 9 '), and that furthermore the covers (3) have on their sides facing the chambers (9, 9 ') a recess (13) in which the respective contact element (4, 4 ') arranged in the chamber (9, 9 ¹ ) ends, 2. Socket (1) according to claim 1, characterized in net that the covers (3) have a further recess (14) on their sides facing away from the chambers (9, 9 ^f )
in which a correspondingly shaped projection (15) on the lamp base (8) fits snugly.
5 3. Socket according to claim 1 to 2, characterized in that the openings (16) for the access of the
Contact pins (17) of the lamp base (8) to the
Contact elements (4, 4") are mounted in the covers (3), these openings (16) being in the
Connect the covers (3) to the recesses (13, 14) formed on opposite sides. 4. Socket (1) according to claim 1 to 3, characterized in that the openings (11) for the connecting cables (5) the supply voltage at the plug-in area
opposite side of the socket body (2)
are. 5. Socket (1) according to claims 1 to 4, characterized in that the chamber &lgr; (9, 9') separating
Cavity (10) of the "H" has an axial positioning bead (18) facing away from a chamber (9). Il I » * I I * ·