JPS62136747A - Metal vapor discharge lamp - Google Patents

Abstract

PURPOSE:To maintain the predetermined attitude of a liminous tube constantly regardless of the setting position of a discharge lamp, by supporting a luminous tube holder itself in freely rotatable state as well as holding the luminous tube rotatably on the holder. CONSTITUTION:A base 2 is attached to one end of the outer tube 1 of a metal vapor discharge lamp, a luminous tube 3 is housed in the outer tube 1, and a pair of electrodes 4A, and 4B are disposed oppositely to each other on both ends of the luminous tube 3. This luminous tube 3 is supported on the ring- shaped bearings 7 of a ring-shaped holder 5 by means of a pair of shafts 8 formed in a shape of projections on the luminous tube 3. This holder 5 is rotatably supported on supporters 9, 10 by means of ring bearings 6 for setting the holder 5 in vertical direction. Then, the luminous tube 3 is rotatably supported on the holder 5 which is also held by supporters 9, 10 rotatably in respect to the outer tube 1, and thus the luminous tube 3 is maintained in its predetermined attitude constantly regardless of the setting position of its discharge lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a metal vapor discharge lamp in which an arc tube is rotatably held.

[Technical background of the invention and its problems]

In conventional metal vapor discharge lamps, the arc tube is fixed inside the outer bulb by a holder, so the mounting position of the arc tube is always the same as that of the discharge lamp.

It is well known that arc tubes are not always used in the optimal position, resulting in a decrease in luminous flux and color unevenness.

For example, regarding the luminous efficiency of a 400W metal halide lamp for vertical lighting using scandium Sc and sodium Na halides, the luminous flux is approximately 40,0001 m when the arc tube is lit in a vertical position, but at 45 degrees If it is tilted, it will be about 37,0001m, and if it is in a horizontal position, the height will drop to about 33,0001m.

To deal with these drawbacks, for example, Japanese Patent Application Laid-open No. 55-10
No. 4064 describes a method as shown in FIGS. 5 and 6. Fig. 5 is an explanatory diagram of the entire lamp, and Fig. 6 is an explanatory diagram of the main parts.The arc tube (3) housed inside the outer W (1) is rotatably held by a fixed holder (5A). That's what I did.

For example, by attaching a mark to one end of such a five-dimensional arc tube (3), the arc tube (3) can be held in a vertical position by gravity, as shown in Figure 5, regardless of the direction in which the lamp is installed. It is stated that.

However, with this method, if the cap (2) attached to the outer tube (11) is a bayonet type (insertion type) cap that can be attached to a lighting fixture with its position always in a fixed direction, two arc tubes (3 ) can be held in a completely vertical position, but in the case of E-type pro metal (screw-in type), the lamp is installed while rotating, so the above-mentioned holder (5
A) is not necessarily placed in the lateral direction of the arc tube (3) as shown in the figure, but may naturally be placed above or below the arc tube (3), or in an intermediate position between the upper or lower direction and the lateral direction. Therefore, in such a case, the holder (5A) becomes an obstacle and the arc tube (3
) clearly cannot assume a vertical position.

Further, even when it is desired to light the arc tube in a horizontal position for the purpose of preventing one-color unevenness, the desired position cannot be maintained for the same reason as in the case of vertical lighting.

[Purpose of the invention]

The present invention has been made to address the above-mentioned drawbacks of the conventional art, and the discharge lamp can be mounted regardless of its orientation.

An object of the present invention is to provide a metal vapor discharge lamp that can always keep an arc tube in a predetermined posture.

[Summary of the invention]

The present invention is characterized in that the arc tube is rotatably held by a holder, and the holder itself is also rotatably supported by a support.

[Embodiments of the invention]

The details of the present invention will be explained below with reference to the illustrated embodiments.

(Example 1) Figures 1 and 2 show a vertically lit 400W metal halide lamp, and Figure 1 is an overall view of the lamp.

FIG. 2 is a schematic diagram of the main parts thereof. (11 is the outer tube with the cap (2) attached to one end, (3) is the outer tube (1)
) A pair of electrodes (4A) at both ends of the arc tube housed in
.

(4B) is installed oppositely, and a predetermined amount of starting rare gas,
Mercury and metal halides such as scandium iodide and sodium iodide are enclosed.

(5) is, for example, a frame-shaped holder for an arc tube.

In addition, there are, for example, ring-shaped bearings (6), (6) on the opposing parts in the downward direction, and ring-shaped bearings (6), (6) on both sides as well. bearing (7), (for force, a pair of protruding shafts (8) provided above the center position of the arc tube (3), (8)
One arc tube (3) is rotatably held by the holder (5) by freely passing through each of the arc tubes (3). Further, the holder (5) has bearings f6) and (6) provided above and below.
), by passing the tips of the supports (9) and (10) loosely through the supports (9) and (10), respectively, so that they are rotatably supported in the lateral direction. In addition, (1υ, αυ are arc tube electrodes (4A).

The power supply line to (4B) can respond to the rotation of the 0 arc tube (3).

Because of this configuration, as shown in FIG. 3, when the lamp is installed at an angle, for example, a frame-shaped holder (5
) is above and below the arc tube (3).

In other words, even if the arc tube (3) reaches the position shown in the figure, which poses an obstacle to maintaining its vertical posture, the holder (5) is supported by the pivot point, so it will immediately rotate and return to the position shown in Figure 1 above. I'll show you 5
This changes the position of the arc tube to the side position of the arc tube (3
) can take a vertical position without being hindered by the holder (5).

t "Oh, in the above embodiment, in order to put the arc tube (3) in a vertical position, the shafts (8) and (8) were provided above the center position of the arc tube (3), but 9 arc tubes + 3 + It is also possible to fix a weight to one end of the arc tube and hold the arc tube (3) in a vertical position using N force.

As a result, the lamp has a maximum luminous flux of 40,0001m? Obtainable.

Note that this effect can be obtained regardless of the direction in which the lamp is attached.

(Example 2) A straight arc tube with 1f poles facing each other at both ends is bent into a dogleg shape using its center as a fulcrum. It is already known that if the lamp is lit in a horizontal position with the part facing downward, the luminous flux can be improved by approximately 20% compared to when a straight tube type light emitting compartment is lit in a horizontal position. In this embodiment, the dogleg-shaped opening is changed to 5 so that the lamp can always be kept in a horizontal position regardless of the direction in which it is mounted.

FIG. 4 shows an overall view of the lamp, and the same parts as in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted. (3A) is an arc tube whose central part is bent into a dogleg shape, and a pair of shafts (8) (only one shown in elevation) is formed in the central part, and these shafts (8)... The arc tube (3) is rotatably held by passing through ring-shaped bearings (7) facing each other on both sides of the frame-shaped holder (5). The holder (5) has support bodies (91, (10) attached to ring-shaped bearings (6), T6) provided above and below, respectively.
)? This is exactly the same as in Example 1 in that the distal end portion is loosely passed through to be supported rotatably in the lateral direction.

With such a configuration, even if the cap is an E type (screw-in type), when the cap (2) is screwed into the socket, the holder (5) will be attached to the top of the arc tube (3).

Even if the dogleg-shaped arc tube (3A) located below is temporarily unable to take the desired horizontal position.

Since the holder (5) immediately rotates, the 9 arc tube (3) should be placed with its center facing up as shown in the figure, and the electrodes (4A),
It is possible to take a horizontal position with both ends (4B) facing downward, and high efficiency as designed can be obtained.

Also, the lamp can be installed regardless of its orientation.

The above effects can be obtained.

As a modification of Embodiment 1, a weight was fixed to one end of the arc tube as a means of maintaining the straight arc tube in a vertical position using gravity, but it seems that it is desirable to prevent color unevenness even at the expense of luminous flux. If you want to keep a straight arc tube in a horizontal position regardless of the direction in which the lamp is installed, you can easily do so by fixing the weight in the above modification to the center of the straight arc tube. Can be made to take a horizontal position.

In addition, when one arc tube is lit in a vertical position, the lower side of the one arc tube becomes low temperature and the upper side becomes high temperature, and the vapor pressure of the luminescent material sealed in the Kaminarimon depends on the temperature before the coldest point of the arc tube. If you try to raise the temperature at the bottom of the arc tube in order to increase the vapor pressure and improve the luminous efficiency, the temperature at the top will also rise excessively, resulting in damage to the arc tube or the metal or coating of the electrode located on the upper side. The evaporation of the emitters caused by the emitters causes problems such as accelerated emitted light and shortened snout lifespans. For this reason, in order to reduce the temperature difference between the top and bottom of the 0-emission tube, a known method is to make the electrode located on the upper side larger than the electrode on the lower side. However, even if such measures are taken, the position of the arc tube changes depending on the direction in which the lamp is installed, and if it becomes difficult to maintain a vertical position at all times, the above-mentioned measures will not necessarily have the desired effect. .

In such a case, 1 according to the present invention, it is possible to maintain the luminous tube in a desired posture regardless of the direction in which the lamp is installed, so the above means has the advantage that it can fully exhibit its effects. .

Furthermore, the present invention is not limited to the metalnolide lamp of the above embodiment, but can also be applied to a high-pressure mercury lamp.

It can also be applied to Tsukuda metal vapor discharge lamps such as high-pressure sodium lamps.

〔Effect of the invention〕

As detailed above, the metal vapor discharge lamp of the present invention is housed in a container with a cap attached to one end, and the holder for rotatably holding the arc tube is also rotatable. Since it is made flexible, it has the advantage that the arc tube can always be maintained in a predetermined position regardless of the type of cap or the direction in which the discharge lamp is attached.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention; Figure 1 is an explanatory diagram of the overall structure of the lamp; Figure 2 is an enlarged view of the main parts;
The figure is an explanatory diagram of the operation, and shows the state immediately after the lamp is installed. FIG. 4 is an explanatory diagram of the entire structure of a lamp according to another embodiment, FIGS. 5 and 6 show a conventional lamp, FIG. 5 is an overall view, and FIG. 6 is an enlarged view of the main parts. (1)...Outer tube. (2)・・・・・・Cap. (31, (3A)...Curved arc tube. (4A), (4B)...Electrode. (5)...Holder

Claims (1)

[Claims] A metal vapor emitting device characterized in that a holder housed in an outer tube having a cap attached to one end and rotatably holding the arc tube is supported on a support so as to be rotatable itself. electric light.