JP4569928B2 - Metal vapor discharge lamp and lighting device - Google Patents

Description

  The present invention relates to a metal vapor discharge lamp and an illumination device having the metal vapor discharge lamp.

High-intensity, high-efficiency, long-life metal vapor discharge lamps such as metal halide lamps (hereinafter simply referred to as “lamps”) are widely used in various places.
The conventional lighting device using the lamp as a light source includes a reflecting plate that has a concave reflecting surface and reflects light emitted from the lamp in a desired direction, in addition to the lamp described above. For the reflector, a so-called closed type in which an opening (light extraction port) of the reflector is closed by, for example, a front glass plate is usually used. This is to prevent the fragments from scattering outside the reflector when the lamp is damaged for some reason.

In recent years, in order to remove the front glass from the lighting device, as shown in FIG. A tube-structured lamp has been proposed (Patent Document 1). Such a lamp is formed by crushing and sealing an arc tube unit as shown in FIG. 10 to an inner tube 14, and covering the inner tube 14 with an outer tube 16 and fixing it to a base 18.
JP-A-8-236087

Recently, since it is used as a light source of a spotlight illumination device in a store or the like, further downsizing of the lamp is required. However, as a result of research and development by the inventors, it has been found that the conventional lamp structure cannot be made sufficiently compact.
In the conventional lamp structure, since the feeders 28 and 30 of the arc tube 12 are joined to the power supply lines 36 and 38 from the same direction (FIG. 10: regions 82 and 84), the arc tube when crushing sealed. 12 is supported by being slightly displaced from the tube axis of the inner tube 14 in the crushing direction (FIG. 9: regions 70 and 72). On the other hand, if the light-emitting tube 12 continues to be lit while being in contact with the inner tube 14, there arises a problem that the inner tube 14 is colored. Therefore, it is necessary to keep the lamp compact so that the arc tube 12 does not contact the inner tube 14. In this case, the fact that the arc tube 12 is supported by being displaced from the tube axis of the inner tube 14 makes it easier for the arc tube 12 to come into contact with the inner tube 14, thereby hindering the compactness of the lamp.

  Then, an object of this invention is to provide the illuminating device which has a metal vapor discharge lamp and a metal vapor discharge lamp which can be compactized conventionally compared with the said problem.

  A metal vapor discharge lamp according to the present invention is joined to a main tube portion, an arc tube having first and second power feeding members extending from the main pipe portion, and the first and second power feeding members, respectively. The first and second power supply lines and the arc tube are accommodated in the first and second power supply lines so that one end of the first and second power supply lines is led out to the outside. A sealed tube formed by crushing and sealing the end portion across the wire, and the first power supply body is from a first direction in a crushing direction, which is a direction in which the end portion of the sealed tube is crushed and sealed. The second power feeder is joined to the second power supply line from a second direction opposite to the first direction of the crushing direction. .

  A metal vapor discharge lamp according to the present invention is joined to a main tube portion, an arc tube having first and second power feeding members extending from the main pipe portion, and the first and second power feeding members, respectively. The first and second power supply lines and the arc tube are accommodated in the first and second power supply lines so that one end of the first and second power supply lines is led out to the outside. A sealed tube formed by crushing and sealing the end portion across the wire, and the first power supply line is crushed and sealed at an end portion of the sealed tube at a joint portion with the first power feeder. The crushing direction is a direction corresponding to the radius of the first power feeder and the radius of the first power supply line, and the second power supply line is recessed with the second power feeder. Corresponding to the radius of the second power feeder and the radius of the second power supply line in the crushing direction It is recessed by the amount.

  The illumination device according to the present invention has the metal vapor discharge lamp described above.

  According to the above configuration, the main tube portion of the arc tube is not supported by being displaced in the crushing direction from the tube axis of the sealed tube when crushing and sealing, and the situation where the arc tube contacts the sealed tube is avoided as much as possible. be able to. Therefore, it is possible to achieve a more compact size than before.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a partially cutaway right side view of a metal halide lamp 10 shown as an example of a high pressure metal vapor discharge lamp, and FIG. 2 is a front view of the same part cutout. FIG. 3 is a partially cutaway right side view of the metal halide lamp 10 with the outer tube 16 and the base 18 removed, and FIG. 4 is a front view of the same part cutout. The rated power of the metal halide lamp 10 is 70 [W].

The metal halide lamp 10 has a triple tube structure including an arc tube 12, an inner tube 14 that is a sealed tube that accommodates the arc tube 12, and an outer tube 16 that is a protective container covered by the inner tube 14. The inner tube 14 and the outer tube 16 are supported by an E-type base 18.
The arc tube 12 has an envelope 26 composed of a main tube portion 20 and thin tube portions 22 and 24 formed on both sides of the main tube portion 20 in the tube axis direction. The main pipe part 20 and the thin pipe parts 22 and 24 are made of translucent ceramic, for example. As the translucent ceramic, for example, an alumina ceramic can be used. In the example shown in FIGS. 1 to 4, the envelope 26 is formed by separately forming the main pipe section 20 and the thin pipe sections 22 and 24 and then integrating them by shrink fitting. For example, the envelope may be formed by integrally forming a main pipe portion and two narrow tube portions.

The main pipe section 20 has a discharge chamber (not shown) that is hermetically sealed, and a pair of electrodes (not shown) are arranged to face each other in the discharge chamber. The discharge chamber is filled with a predetermined amount of metal halide, rare gas, and mercury. As the metal halide, sodium iodide, dysprosium iodide, or the like is used.
In each of the thin tube portions 22 and 24, power feeding bodies 28 and 30 having the respective electrodes bonded to the tip portions are inserted. The power feeding bodies 28 and 30 are sealed by sealing materials 32 and 34 made of frit poured into the end portions of the thin tube portions 22 and 24 on the side opposite to the main tube portion 20. The portions of the sealing materials 32 and 34 appearing in FIGS. 1 to 4 are portions protruding from the ends of the thin tube portions 22 and 24.

The end of the power supply body 28 opposite to the electrode is electrically connected to the power supply line 36, and similarly, the end of the power supply body 30 opposite to the electrode is electrically connected to the power supply line 38. Has been. Since the power supply bodies 28 and 30 are fitted with the sleeves 29 and 31 at the joint portions with the power supply lines 36 and 38, the diameters thereof are increased accordingly.
The power supply lines 36 and 38 are joined to the power feeders 28 and 30 of the arc tube 12, respectively, support the arc tube 12 and supply power to the arc tube 12. In order to supply power from the outside, the power supply lines 36 and 38 are pinch-sealed with metal foil portions 40 and 42 so as to lead the external lead portions 44 and 46 to the outside of the inner tube 14. In addition, in one power supply line 36, at least a portion facing the other power supply line 38 and the power supply body 30 connected thereto is covered with a sleeve 48 made of, for example, quartz glass. The external lead portion 44 is electrically connected to the shell portion 60 of the base 18, and the external lead portion 46 is electrically connected to the eyelet portion 62 of the base 18.

  The above-described arc tube 12 and the like are accommodated in an inner tube 14 having a cylindrical shape, for example, a cylindrical shape, as shown in FIGS. The inner tube 14 is made of, for example, quartz glass, and one end portion on the side where the metal foil portions 40 and 42 exist are crushed by a so-called pinch seal method and hermetically sealed at portions corresponding to the metal foil portions 40 and 42. . Therefore, it can be said that the inner tube 14 is a one-sided sealed tube. Here, the portion of the inner tube 14 that is crushed and sealed is referred to as a pinch seal portion 50.

The reason why the inside of the inner tube 14 is evacuated is to prevent oxidation of metal members such as the power feeders 28 and 30 and the power supply lines 36 and 38 that are exposed to high temperatures when the lamp is turned on. From the viewpoint of preventing oxidation, the inside of the inner tube 14 (that is, the outside of the arc tube 12) may be filled with an inert gas instead of being evacuated.
The pinch seal portion 50 is supported by the base 18, and both are fixed by an inorganic adhesive 54. The inorganic adhesive 54 is mainly composed of silica and alumina and has a heat resistant temperature of 1000 ° C.

  As shown in FIGS. 1 and 2, the inner tube 14 is covered with an outer tube 16 having a bottomed cylindrical shape (that is, a cylindrical shape in which one end is closed and the other end is opened). The outer tube 16 is made of hard glass, for example, and functions as a protective tube. That is, even if the arc tube 12 is broken and the inner tube 14 is damaged, it plays a role of preventing further diffusion of fragments and the like. Further, the outer tube 16 has the same cylindrical shape as the inner tube 14 in order to ensure the compactness of the lamp, for example, a cylindrical shape, and in order to ensure a clearance when the outer tube 16 is put on the inner tube 14 in the assembly process. Moreover, the gap between the inner tube 14 is 1 mm to 2 mm on average. The outer tube 16 has an open end 56 supported by the base 18, and both are fixed by an inorganic adhesive 54.

Pinch sealing (crushing sealing) is a processing method in which a heat-softened sealed portion is mechanically crushed from both sides by a pair of pinchers (pressing dies). Since the crushing is uniform from both sides and the thickness of the planned sealing portion is substantially uniform, the axis of the power supply lines 36 and 38 in the crushing direction is substantially coincident with the tube axis of the inner tube 14. Become.
FIG. 5 is a perspective view of the arc tube unit according to Embodiment 1. FIG.

  The arc tube unit includes the arc tube 12 and the power supply lines 36 and 38. The power supply body 28 and the power supply line 36 are joined, and the power supply body 30 and the power supply line 38 are joined. In the actual manufacturing process, first, such an arc tube unit is prepared, and then inserted so that the metal foil portions 40 and 42 are positioned at the planned sealing portion of the quartz tube that becomes the inner tube 14. Thus, the heat-softened sealed portion planned portion is crushed.

In the first embodiment, as shown in FIG. 5, the power feeder 28 is joined to the power supply line 36 from the first direction (region 74), and the power feeder 30 is connected to the power supply line 38 in the first direction. Joined from a second orientation that is the opposite orientation (region 76). By doing in this way, when the sealing part planned part is crushed and sealed, deviation from the inner tube 14 tube axis in the crushing direction of the main pipe part 20 can be suppressed (regions 66 and 68). Therefore, the situation where the main pipe part 20 contacts the inner pipe 14 can be avoided as much as possible.
(Embodiment 2)
The second embodiment is different from the first embodiment in the shape of the power supply lines 36 and 38 and the joining relationship between the power feeders 28 and 30 and the power supply lines 36 and 38. Other than this, the second embodiment is the same as the first embodiment. It is. Only differences from the first embodiment will be described below.

FIG. 6 is a perspective view of the arc tube unit according to the second embodiment.
In the second embodiment, as shown in FIG. 6, the power supply line 36 is recessed by an amount corresponding to the radius of the power supply body 28 and the radius of the power supply line 36 in the crushing direction at the joint with the power supply body 28. The power supply line 38 is recessed by an amount corresponding to the radius of the power supply body 30 and the radius of the power supply line 38 in the crushing direction at the junction with the power supply body 30 (area 80). By doing in this way, when the sealing part planned part is crushed and sealed, deviation from the inner tube 14 tube axis in the crushing direction of the main pipe part 20 can be suppressed. Therefore, the situation where the main pipe part 20 contacts the inner pipe 14 can be avoided as much as possible. Furthermore, by providing the recesses as described above, when the power feeding bodies 28 and 30 are joined to the power supply lines 36 and 38, they can be easily positioned.

In addition, the dent formed in the power supply lines 36 and 38 may exist in a relatively wide range as shown in FIG.
Next, a spotlight illumination device having the metal halide lamp 10 as a light source will be described with reference to FIG.
As shown in FIG. 8, the lighting device 110 includes a lighting fixture 112 and a metal halide lamp 10 attached to the lighting fixture 112. The lighting fixture 112 is a spotlight-type lighting fixture that does not have a front glass in the direction of light emission from the metal halide lamp 10 and is open to the front. The lighting fixture 112 is attached to a ceiling, for example. When attached to the ceiling or the like in this way, the light emission direction is downward. Therefore, in this case, the lighting fixture is an open bottom type. Further, a ballast (not shown) for lighting the metal halide lamp 10 is provided on the ceiling by being embedded in the ceiling.

The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described form, and for example, the following form may be employed.
(1) In the metal halide lamp of the above embodiment, an E-type (Edison base) is used for the base, but the present invention is also applicable to a pin type or a swan type base.
(2) Although the metal halide lamp of the above embodiment has a rated power of 70 [W], the present invention is applicable to a rated power of 20 [W] to 150 [W].
(3) In the above embodiment, the present invention is applied to a metal halide lamp. However, the present invention can be applied to other types of high-pressure metal vapor discharge lamps such as a high-pressure mercury lamp and a high-pressure sodium lamp. It is.
(4) In the second embodiment, the power feeder 28 is joined to the power supply line 36 from the first direction (region 78). Similarly, the power feeder 30 is joined to the power supply line 38 from the first direction. (Area 80). However, the present invention is not limited to this, and the power feeder 28 is joined to the power supply line 36 from the first direction, and the power feeder 30 is joined to the power supply line 38 from the second direction. Good. In this case, the step of the power supply line 38 is formed in a direction opposite to the direction shown in FIG.
(5) In the above embodiment, a lamp having a triple-pipe structure has been shown. However, the present invention is not limited to this and can be applied to a lamp having a double-pipe structure.
(6) In the above embodiment, a single-sealed lamp in which the base is present only at one end of the arc tube is shown. However, the present invention is not limited to this, and both seals in which the base is present at both ends of the arc tube are shown. It is also applicable to a stop lamp.

  For example, the metal vapor discharge lamp according to the present invention is required to be compact and can be suitably used as a lamp that can ensure safety even when mounted on a front-opening type lighting fixture.

It is a partially cutaway right view of the metal halide lamp 10 which concerns on this invention. 1 is a partially cutaway front view of a metal halide lamp 10 according to the present invention. It is a partially cutaway right side view of the metal halide lamp 10 according to the present invention with the outer tube 16 and the base 18 removed. It is a partially cutaway front view of the metal halide lamp 10 according to the present invention from which the outer tube 16 and the base 18 are removed. 2 is a perspective view of an arc tube unit according to Embodiment 1. FIG. 6 is a perspective view of an arc tube unit according to Embodiment 2. FIG. It is a perspective view of the arc tube unit concerning a modification. It is an external view of an illuminating device. It is a partially cutaway right view of the conventional metal halide lamp. It is a perspective view of the arc tube and power supply line of the conventional metal halide lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Metal halide lamp 12 Light-emitting tube 14 Inner tube 16 Outer tube 18 Base 20 Main tube part 22, 24 Narrow tube part 26 Envelop 28,30 Feeder 29,31 Sleeve 32,34 Sealing material 36,38 Power supply line 40,42 Metal foil portion 44, 46 External lead portion 48 Sleeve 50 Pinch seal portion 54 Inorganic adhesive 56 Open end portion 60 Shell portion 62 Eyelet portion 110 Illumination device

Claims (2)

An arc tube having a main section and first and second power feeding bodies extending from the main section;
First and second power supply lines joined respectively to the first and second power feeders;
The arc tube is accommodated inside, and the ends of the first and second power supply lines are crushed and sealed with the first and second power supply lines sandwiched between them so that one end of the first and second power supply lines is led out to the outside. With a sealed tube,
The first power feeder is joined to the first power supply line from a first direction in a crushing direction, which is a direction in which an end portion of the sealed tube is crushed and sealed, and the second power feeder The metal vapor discharge lamp is joined to the second power supply line from a second direction opposite to the first direction of the crushing direction.   A lighting device comprising the metal vapor discharge lamp according to claim 1.

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