JPS6226758A - Metal vapor high pressure discharge lamp - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application A discharge vessel consisting of a light-transparent ceramic J) containing a metal, metal compound or alloy and one or more rare gases, the end of which is hermetically closed, through which a lead wire for an electrode is passed, and a glass solder is used as a seal. Ori,
and a heat shield made of metal, which is attached externally to the end of the discharge vessel, and which absorbs the heat rays generated in the area of the electrode chamber and releases them to the coldest position of the discharge vessel. The present invention relates to a metal vapor high pressure discharge lamp of the type.

PRIOR ART The use of heat shields to improve the color temperature is necessary, especially in low-power lamps, since the inherent heat generated in this case often causes damage to the amalgam inside the discharge vessel. This is because it is no longer sufficient to achieve a high vapor pressure. The advantages of heat shields such as those described above are well known to those skilled in the lamp industry. German Patent Application DE 29 28 067 A1 discloses a heat shield which cylindrically surrounds the discharge chamber at regular intervals, but no mention is made of its fixing device. Federal Republic of Germany Patent No. 2935
The heat shield described in '980 is fixed by two tongues which narrowly surround the electrode chamber and are bent towards the end face of the discharge vessel. European Published Patent Application No. 83201801.4 describes a heat shield that surrounds the discharge chamber in a cylindrical manner and at intervals, and that is connected to the holding wire via a glass pearl and two connecting rods. It is electrically insulated and fixed. In all known fixing types of heat shields, the material and/or
Or a large amount of time is required or positioning by tightening is not guaranteed. In the former case, the manufacturing cost increases, while if the heat shield is fixed, the vibration of the lamp causes a change in the combustion voltage.

In turn, this causes operating parameters to deviate from the target values.

Problem to be Solved by the Invention It is an object of the invention to develop a heat shield in order to be able to keep the operating values of the lamp within narrow tolerances on the one hand and to reduce the manufacturing costs on the other hand. The objective was to easily and reliably fix the

One way to solve problems.

This problem is solved in a metal vapor high-pressure discharge lamp of the type mentioned at the beginning, in that it is fixed to the discharge vessel 1.17.21 by means of a heat shield 2.11, 14.20 or a glass solder 3, 3'. be done.

Advantageous Effects of the Invention According to the invention, the fixing of the heat shield is advantageously carried out by means of a glass solder used for sealing the ends of the discharge vessel. The respective heat shield surrounds the end of the discharge vessel in the form of a sleeve, the fixing taking place in the peripheral area of the sleeve and the liquid glass solder being defined in the gap formed by the sleeve and the discharge vessel. Inflow. The sleeve-like heat shield is provided with a tongue bent towards the longitudinal axis of the discharge vessel at the peripheral area defined for fixation, the tongue contacting the end face of the discharge vessel. . Good positioning and precise alignment of the sleeve is thereby achieved during the sealing process. In the case of a sealed discharge vessel, therefore, a close thermal contact with the sleeve is created. The amalgam vapor pressure increase caused by the sleeve is always reproducible, so that the combustion voltage in the lamp can be kept within narrow tolerance limits. Additionally, the sleeve causes more rapid and uniform heating of the seal,
The reason is that the ceramic tube is surrounded by a sleeve, and the sleeve is made of the same material as the lead wire (niobium).
This is because it consists of Another advantage is that 1
Different power stages can be achieved with different types of ceramic tubes and different configurations of sleeve length. The sleeve contacts the discharge vessel at least at a periphery defined for fixation. In an advantageous embodiment,
The large part of the sleeve facing the discharge vessel has a constant distance with respect to the discharge vessel.

Instead of tongues formed on the periphery of the heat shielding sleeve, other positioning and support means are conceivable. Thus, for example, the entire periphery can be bent or deep-drawn at right angles to the end face of the discharge vessel. Furthermore, the periphery of the heat shielding sleeve may have a recess in the form of a round recess, which rests on the end face of the discharge vessel. The contact is made in such a way that the heat shielding sleeve is fixed in a vibration-resistant and potential-free manner.

Example The invention will now be described in detail with reference to the illustrated embodiments.

The exploded view in FIG. 1 shows a discharge vessel 1 (only one end of which is shown in this figure), a sleeve-shaped heat shield 2,
It consists of a glass brazing ring 3, a lead wire 4, and an electrode 5 fixed to the lead wire. The discharge vessel 1, made of aluminum oxide, has a cylindrical tube 6, at each end of which one
Two bunyu 7 are fitted. A lead wire 4 holding an electrode 5 is hermetically sealed in the axial hollow space 8 of the bushing 7 by means of a glass brazing ring 3 . The structures previously described are common and known to those skilled in the art. During assembly of the parts and before hermetic sealing, a cylindrical thermal shielding sleeve 2 made of niobium is also fitted to the end of the discharge vessel. The heat shielding sleeve 2 closely surrounds the tube 6 and has on its front side a tongue 9 which rests on the end 1o of the tube 6. When performing hermetic sealing, a part of the melt-sealed glass brazing ring 3 is caused by capillary action to close the discharge vessel l.
into the gap formed by the tube 6 and the heat shielding sleeve 2, so that the gap is held in place without the need for additional working steps or materials after the glass solder has cooled and a good thermal exchange is made possible.

An alternative configuration for the heat shield sleeve °11 is shown in FIG. All steps as well as the configuration of the discharge vessel I are the same as in FIG. In this case, the heat shielding sleeve 11 has a short upper section 12 provided with a tongue 9' that narrowly surrounds the discharge vessel 1 and a short upper section 12 that is provided with a tongue 9' that narrowly surrounds the discharge vessel I.
and a long lower section 13 surrounding the. The advantage of this embodiment is that the glass solder fills evenly over the entire upper periphery and thus tighter tolerances of the lamp parameters are adhered to in the manufactured lamp.

The conical heat shielding sleeve [4] of FIG. 3 operates in a similar manner. In this case, the discharge vessel 15 has an upper cylindrical part 16 of smaller diameter and a larger diameter part 17 through which the discharge passes, the latter part being connected to the electrode chamber by a conical part 18. The conical heat-shielding sleeve I4 rests with its tongue 9'' on the end face lO of the discharge vessel 15 and surrounds the electrode chamber 18 at a constant distance, so that the sealing and thus its fixing are effected by the glass soldering ring 3'. .

FIG. 4 shows a stepped heat shielding sleeve 20 with a conically enlarged portion 22 towards the discharge vessel 21, which enlarged portion covers the electrode chamber of the discharge vessel 21.

As explained in the previous embodiment, retention is provided by the 9° tongue during the sealing process. A short upper section 23 of the heat shielding sleeve 20 with a small diameter narrowly and closely surrounds the upper end of the discharge vessel 21 and is in this case melt-sealed with said upper end in the finished lamp, while the central part of,
The cylindrical section 24 has a constant spacing relative to the discharge vessel 21 .

[Brief explanation of the drawing]

FIG. 1 is an exploded view of a first embodiment of a heat-sealed cylindrical heat shield sleeve; FIG. 2 is a perspective view of one end of the discharge vessel of an alternative embodiment of a stepped cylindrical heat shield sleeve; FIG. 3 is an exploded view of a third embodiment in which a conical heat shielding sleeve is melt-sealed, and FIG. 4 is a perspective view of one end of a discharge vessel in another form.1, 17.21...Discharge vessel, 2.11, 14.2
0...Heat shield (heat shield sleeve), 3.3'...
Glass solder (ring), 4... Lead wire, 5... Electrode, 9.9', 9'', 9'''... Tongue piece, 10.1
9... End face FIG, 1

Claims (1)

[Claims] 1. Discharge vessel (1, 17,
21), the discharge vessel is hermetically closed at both ends and contains therein an electrode (5) and a specified metal, metal compound or alloy as a filler and one or more rare gases, A lead wire (4) for the electrode (5) is passed through the hermetically closed end, a glass solder (3, 3') is used as a seal, and the discharge vessel ( Thermal shields made of metal (2, 11, 14, 20) are attached externally to the ends of the
), the shielding plate absorbs the heat rays generated in the area of the electrode chamber and releases them to the coldest position of the discharge vessel (1, 17, 21),
The heat shield (2, 11, 14, 20) is made of glass solder (3,
A metal vapor high-pressure discharge lamp, characterized in that it is fixed to the discharge vessel (1, 17, 21) by a metal vapor high-pressure discharge lamp (3'). 2. The fixation of the heat shield (2, 11, 14, 20) is also carried out by the glass solder (3, 3') used to seal the ends of the discharge vessel (1, 17, 21) A metal vapor high pressure discharge lamp according to claim 1. 3. The respective heat shield (2, 11, 14, 20) surrounds the end of the discharge vessel in the form of a sleeve, the fixing taking place in the peripheral area of the sleeve. Metal vapor high pressure discharge lamp. 4. The discharge vessel (1, 1
A member (9) resting on the end face (10, 19) of the heat shield (2, 11, 14, 20) on which the heat shield (2, 11, 14, 20) is supported.
, 9', 9'', 9'''). 5. Sleeve-shaped heat shield (2
, 11, 14, 20) are tongue-like pieces (9, 9', 9
″, 9″′), and the tongue-shaped piece is connected to the discharge vessel (1, 17,
21) and the tongues (9, 9', 9'', 9''') are bent toward the longitudinal axis of the discharge vessel (1, 17).
, 21), in contact with the end faces (10, 19) of the walls (10, 19). 6. The sleeve-shaped heat shield (2, 11, 14, 20) is attached to the discharge vessel (1, 17, 2) at the specified periphery for fixation.
1) and is in contact with the heat shield (2, 11, 14, 2
6. A metal vapor high-pressure discharge lamp according to claim 4, wherein the other part of the discharge vessel (1, 17, 21) has a constant distance from the discharge vessel (1, 17, 21). 7. Metal vapor according to claim 4 or 5, wherein the sleeve-shaped heat shield (2, 11, 14, 20) contacts the discharge vessel (1, 17, 21) over its entire length. High pressure discharge lamp.