JP2006324019A - Lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp device superior in heat resistance and capable of extracting light efficiently, while the light emitting region of the lamp is enclosed in a housing of complete sealing structure. <P>SOLUTION: The lamp device comprises a lamp body 23 in which an electrode 22 is supported while being sealed in a bulb body 21 and an external terminal 28 conducting with the electrode 22 is formed at the end of the bulb body 21, a housing in which a window hole A for emitting illumination light and a support opening B for supporting the bulb body 21 or the external terminal 28 are formed and has a reflecting face that reflects the illumination light to the inner face 31, 32 and guides to the window hole, and a window plate 14 which seals the window hole A airtightly. The bulb body 21 of the lamp body 23 is supported airtightly at the support opening B and the end part of the bulb body is placed outside of the housing, thereby, the light emitting region of the lamp body is sealed airtightly inside the housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lamp device that performs illumination using a lamp body in which an electrode serving as a light source is enclosed in a bulb. The lamp device of the present invention is applied to, for example, a lighting device that houses a lamp main body in a housing and performs efficient illumination using light reflected by a reflecting mirror formed on the inner surface of the housing. In addition, the lamp device of the present invention is applied to illumination in a poor air environment such as an aircraft or a ship that navigates a poor environment such as a desert where sand dust flies or the sea containing salt.

Lamps that generate illumination light in a light emitting region in a tube by generating a discharge between counter electrodes (discharge lamp) or heating a filament electrode (incandescent lamp) are widely used. .
In such a lamp, an electrode for generating light is enclosed inside a glass tube, and an external terminal for electrically connecting the external wiring for power supply and the electrode is provided on the tube. It is provided at the end.
In general, the lamp (main body) is often used as a lamp device that is mounted on a housing having a structure surrounding a tube. This is because the use of light can be increased by forming a reflective surface on the inner surface of the housing, and the explosion-proof that can prevent the glass pieces from scattering as much as possible when the tube ruptures for some reason. This is to provide a function.

  On the other hand, since the lamp body is heated to a high temperature (in the light emitting region, it may exceed 1000 degrees Celsius), it is necessary to take measures against the temperature. Conventionally, in order to promote heat dissipation of the lamp body, the housing of the lamp device has an open structure with respect to the outside. At first glance, even if the housing has a hermetically sealed structure, its purpose is to protect the inner tube, and there are often places where air flows between the outside and the outside.

On the other hand, for example, in lighting used in dangerous places where flammable materials exist around the lamp device, the lamp body has a completely sealed structure in order to completely eliminate the possibility of the lamp device becoming an ignition source. Is used. In the lamp device having a sealed structure, it is difficult to radiate heat from the lamp body due to the structure. Therefore, a structure in which the cooling effect of the lamp body is enhanced has been studied (see Patent Document 1). For example, one end sealing tube portion of the lamp body is supported by a reflector (housing), and the other end sealing tube portion of the lamp body is connected to explosion-proof glass via a ceramic-based adhesive member. A device in which the sealed end portion is cooled by forming a heat transfer route in contact with both ends is disclosed.
JP 2004-79225 A

  In a lamp device of a housing (open housing) where there is a place where air flows between the outside and the outside, the heat dissipation is excellent, but the atmosphere around the lamp device contains dust and corrosive substances (for example, salt). In such an environment, the inside of the housing is contaminated and corroded, and there is a problem that the amount of light is attenuated and the product life is shortened.

On the other hand, with the structure as described in Patent Document 1 in which a completely sealed structure is formed, a lamp unit having a complete explosion-proof function and an enhanced cooling effect can be obtained. On the other hand, inside the sealed structure, it is necessary to wire the power supply line that connects to the terminal of the other end sealing tube part on the explosion-proof glass side, forming a heat-resistant power supply line and forming a hole in the housing However, it is necessary to form a mechanism for sealing the hole with the power supply line passing through the hole (if the hole is not sealed, a completely sealed structure is not obtained).
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lamp device having excellent heat resistance even in a lamp device in which a light emitting region of a lamp is confined within a completely sealed housing.

In addition, the electrode position of the lamp body is inherently different from one individual to another, and the position of the light emission center is different for each individual. Therefore, when the position of the light emission center of the lamp main body with respect to the reflection surface is deviated from the light emission position in the design of the reflector, light cannot be extracted efficiently. In particular, in a lamp that forms a focal point by using a reflecting surface of a reflector, the focal position is blurred.
Accordingly, an object of the present invention is to provide a lamp device that can be easily adjusted in position with a reflector even when there is an individual difference in the electrode position of the lamp body.

  The lamp device of the present invention made to solve the above problems is a lamp in which an electrode for generating illumination light is supported in a state of being enclosed in a bulb and an external terminal that is electrically connected to the electrode is formed at the end of the bulb A reflecting surface formed with a main body, a window hole for emitting illumination light from the light emitting area of the lamp main body, and a support opening for supporting the lamp main body and reflecting the illumination light from the light emitting area to the window hole on the inner surface And a window plate that hermetically seals the window hole, hermetically supporting the bulb or external terminal of the lamp body in the support opening and at least letting the external terminal out of the housing, The light emitting area of the lamp body is hermetically sealed in the housing.

Here, the electrode of the lamp body may be any electrode that can generate light by supplying power, and may be a counter electrode or a filament electrode. The material of the tube is preferably a material having high transparency, high hardness, and excellent corrosion resistance, such as glass, and quartz glass is particularly preferable.
The shape of the tube is not particularly limited, but in short, light can be efficiently emitted from the light emitting region, and the shape of the inner wall portion of the support opening and the shape of the supported portion of the tube body are airtight. It is only necessary to have a combination of shapes that can maintain the above.
The material of the housing is preferably made of a metal or glass material. The reflecting surface formed on the inner surface may be a concave reflecting mirror surface (when condensing), a flat reflecting mirror surface, a scattering reflecting surface, or the like, depending on the application. In addition, when using a glass material, it can be set as a reflective surface by forming the reflective film by a metal, a dielectric film, etc. in an inner surface.
The shape and number of window holes and support openings formed in the housing are not particularly limited, but the number of support openings is one according to the shape of the tube and the number of support points (when the tube is supported on one side). Or two (when the tube is supported on both sides).

  According to this invention, in the lamp device, the tube body is hermetically supported at the position of the support opening formed in the housing such that the end of the tube body of the lamp body comes out of the housing. Further, the window hole of the housing is hermetically sealed with a window plate, and the irradiation light directly irradiated from the light emitting region and the illumination light reflected by the reflection surface formed on the inner surface of the housing are emitted to the outside of the housing.

According to the present invention, since the window hole and the support opening formed in the housing are both hermetically sealed, the light emitting region and the reflecting surface in the housing can be completely hermetically sealed, Is not contaminated by dust or corroded by corrosive substances, and there is no problem that the light intensity is significantly attenuated or the product life is shortened.
On the other hand, since the external terminal portion of the lamp body is outside the hermetic sealing portion at the support opening and is in contact with the outside air, there is no problem in heat resistance of the terminal portion as in the conventional example. Since a heat transfer route for radiating heat to the housing is secured for the hermetic sealing portion, no thermal problem occurs.
Further, when the tube or the external terminal is hermetically supported with respect to the support opening, the tube can be supported while adjusting the position between them, so that the positional relationship between the reflecting surface of the housing and the tube is adjusted. Therefore, the reflected light can be emitted efficiently.

(Means and effects for solving other problems)
In the above invention, the lamp body includes a pair of electrodes disposed on both sides of the light emitting region, and a pair of rod-shaped tube regions that support the electrodes in a sealed state. The rod-shaped tube region is a support opening portion. It may be fixed with an adhesive material.
In the lamp body, a pair of electrodes are arranged on both sides of the light emitting region, a pair of rod-shaped tube regions are formed to support the electrodes in a sealed state, and the rod-shaped tube region is an adhesive material at the support opening portion. It may be fixed with.
Here, molten glass, ceramic cement, or the like can be used as the adhesive material.
According to the present invention, a pair of rod-shaped tube regions are formed on both sides across the central light-emitting region, and each rod-shaped tube region is fixed by the adhesive material at the support opening.
Therefore, since the tube is supported in a balanced manner at two points on both sides, it can be supported stably. Moreover, since it adheres with an adhesive material, a support opening part can be kept airtight easily. Further, by fixing, the support opening portion does not change thereafter, and the position of the lamp with respect to the reflecting surface can be stably maintained.

In the above invention, the tube may be fixed to the support opening in a state where the position with respect to the support opening is adjusted.
According to the present invention, since the position adjustment is performed when the tube is fixed to the support opening, it can be accurately adjusted so that the positional relationship with the reflecting surface of the housing is an optimal positional relationship. After fixing, the positional relationship can be maintained.

In the above invention, a buffer member made of a material closer to the thermal expansion coefficient of the tube material than the housing material is attached to the inner surface of the support opening so that the buffer member and the tube body are fixed to each other. It may be.
If a metal material with a high coefficient of thermal expansion is used for the housing material and a glass material with a lower coefficient of thermal expansion is used for the rod-shaped tube region material, a difference in coefficient of thermal expansion will occur and damage will occur when fixing And airtightness are likely to occur.
Therefore, a buffer member is attached to the inner surface of the support opening, and the adhesive member is fixed between the buffer member and the rod-shaped tube region. Thereby, it can fix airtight, suppressing the influence of thermal expansion.

  In the above invention, the tube may be glass-welded at the support opening. By glass welding, it is possible to easily fix the support opening and the tube body while adjusting the position when the glass is in a molten state. In addition, since no positional deviation occurs after fixing, it can be held stably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below, and it goes without saying that various aspects are included without departing from the spirit of the present invention.

(Embodiment 1)
FIG. 1 is a perspective view showing a configuration of a lamp device 10 according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof.
The lamp device 10 includes a body 11, a body 12 with a window hole, a housing 20 including left and right side walls 13, a window plate 14 and a window plate stopper 15 that hermetically seals the window plate 14, and rod-like regions on the left and right. The lamp body 23 includes a tube 21 and an electrode 22, and a welding glass 25.

The housing 20 is formed into an airtight box block shape by assembling the body 11 made of aluminum alloy, the body 12 with window holes, and the left and right side walls 13 using an O-ring 26 and screws 27.
A space for housing the lamp body 23 is formed inside the housing 20, and the mirror is finished so that the inner wall surfaces 31 and 32 thereof are concave reflecting mirrors.

A window hole A is formed in the body 12 with a window hole, and a window glass 14 and a window plate stopper 15 with a window hole are attached on the window hole A so as to overlap each other, and an O-ring 26, The window hole A is hermetically sealed by fastening the window plate stopper 15 to the body with the window hole using screws 27.
The left and right side walls 13 are respectively formed with support openings B, and the tube body 21 is supported by the two support openings B in a balanced manner by penetrating the rod-shaped portion of the tube body 21.

The lamp body 23 has a pair of electrodes 22 arranged in a straight line, and one end side of each electrode 22 is opposed to the center. The tube body 21 is formed with a pair of rod-shaped tube bodies so as to enclose the electrode 22, and the other end side of each electrode 22 is sealed to become an external terminal 28.
As described above, the lamp body 23 is supported by the support opening B so that the end of the tube body 23 (the portion where the external terminal 28 is formed) is positioned outside the support opening B. Become.

  The welding glass 25 is used as an adhesive material for making the tube 21 and the support opening B of the side wall 13 airtight. That is, the welding glass 25 is poured into the support opening B in a molten state at a high temperature and then fixed by being cooled. When the welding glass 25 is in a molten state, the positional relationship of the lamp body 23 with respect to the housing 20 is optimized by determining the position of the lamp body 23 relative to the support opening B or by attaching the glass after positioning. Positioning can be performed accurately, and the positional relationship does not change after fixing. FIG. 4A is a diagram for explaining a state in which the lamp main body 23 is positioned in order to optimize the optical performance of the lamp device 10 and, as a result, is positioned at a position deviated from the designed lamp mounting position. It is. There is an individual difference in the positional relationship between the tube 21 and the electrode 22, and the reflectors formed on the inner wall surfaces 31 and 32 of the housing 20 also have errors in processing and assembling the housing. As described above, in some cases, the optical performance of the lamp device 10 can be improved by decentering or tilting the position of the bulb 21 with respect to the central axis of the support opening B. In such a case, the optical performance can be optimized by adjusting the position at the time of adhesion by the welding glass 25.

  As shown in FIG. 2, the lamp device 10 assembled as described above is directed to the window hole A out of the light emitted from the light emitting region of the lamp body 23 (the gap where the electrodes of the counter electrode 22 face each other). The light L1 is directly emitted from the window hole A, and the light L2 directed toward the inner wall surfaces 31 and 32 is emitted from the window hole A after being reflected by the concave reflecting mirror formed there.

  Moreover, in the said embodiment, although the reflective surface formed in the inner wall surfaces 31 and 32 was made into elliptical shape, you may make it parabola shape, planar shape, polyhedron shape, etc. Further, the window glass 14 may have a lens function.

(Embodiment 2)
FIG. 3 is a cross-sectional view of a lamp device 30 according to another embodiment of the present invention. In the figure, the same structures as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description is omitted.

The lamp device 30 and the lamp device 10 described with reference to FIGS. 1 and 2 are different in the method of fixing the tube 21 in the support opening B. As described above, the body 11, the body 12 with window holes, and the left and right side walls 13 constituting the housing 20 are made of aluminum alloy having excellent heat dissipation, and the thermal expansion coefficient of the glass tube 21 is different from that of the glass tube 21. The difference is big. Therefore, when fixing with the welding glass 24, while the temperature is lowered from the welding temperature to room temperature and solidified, the welding glass 24 may be damaged and airtightness may occur.

  Therefore, the thermal expansion coefficient difference is reduced by interposing a buffer member 29 made of a material having a thermal expansion coefficient smaller than that of the aluminum alloy and a thermal expansion coefficient close to that of glass, for example, Kovar, Invar, and Super Invar. Thereby, damage due to a difference in thermal expansion coefficient and poor airtightness can be avoided, and the reliability of the fixed portion can be improved. The side wall 13 and the buffer member 29 are connected in an airtight manner using an O-ring 26 and a screw 27.

  FIG. 4B illustrates a state where the lamp body 23 is positioned at a position deviated from the designed lamp mounting position due to individual differences of the lamp body 23 when glass welding is performed in the lamp device 30. FIG. Similar to the structure of FIG. 4A, the optical performance can be optimized by adjusting the position at the time of bonding with the welded glass 25.

  As described above, the lamp body 23 used in the description of the two embodiments has a structure in which a pair of electrodes are disposed on both sides of the light emitting region and a rod-shaped tube region is formed on both sides. May be U-shaped so that the two rod-shaped tube regions are arranged in parallel, and two support openings may be provided on one side wall. Further, in the case of a filament electrode, electrode pairs may be arranged in parallel inside the tube and the two electrodes may be supported by one rod-shaped tube region. In this case, only one support opening is required.

  Further, in Embodiments 1 and 2 described above, the tube 21 is supported in the support opening B, but the external terminal 28 may be supported in the support opening B as shown in FIG. In this case, it is preferable to reinforce the external terminal so that it is not easily deformed.

  The lamp device of the present invention is applied to a lighting device or the like. In particular, it is used for lighting in a poor air environment such as an aircraft or a ship that navigates a poor environment such as a desert where sand dust flies and the sea containing salt.

The perspective view which shows the structure of the lamp device which is one Embodiment of this invention. Sectional drawing which shows the structure of the lamp device which is one Embodiment of this invention. Sectional drawing which shows the structure of the lamp device which is other one Embodiment of this invention. The figure explaining the state where the lamp main body was attached to the position which deviated from the design lamp attachment position. Sectional drawing which shows the structure of the lamp device which is other one Embodiment of this invention.

Explanation of symbols

10: Lamp device 11: Body 12: Body with window hole 13: Side wall 14: Window plate glass 15: Window plate stopper 20: Housing 21: Tube 22: Electrode 23: Lamp body 25: Welded glass 26: O-ring 27: Screw 28: External terminal

Claims (5)

A lamp body in which an external terminal that supports an electrode for generating illumination light in a state of being enclosed in a bulb and is electrically connected to the electrode is formed at the end of the bulb,
A window hole for emitting illumination light from the light emitting area of the lamp body and a support opening for supporting the lamp body are formed, and a reflecting surface for reflecting the illumination light from the light emitting area and guiding it to the window hole is formed on the inner surface. Housing
A window plate hermetically sealing the window hole,
A lamp device characterized by hermetically sealing a light emitting area of a lamp body in a housing by supporting a bulb or an external terminal of the lamp body in a support opening in an airtight manner and at least the external terminal protruding from the housing. . In the lamp body, a pair of electrodes are arranged on both sides of the light emitting region, a pair of rod-shaped tube regions are formed to support the electrodes in a sealed state, and the rod-shaped tube region is an adhesive material at the support opening portion. The lamp device according to claim 1, wherein the lamp device is fixed with a lamp. The lamp device according to claim 1, wherein the bulb is fixed to the support opening in a state where the position with respect to the support opening is adjusted. A buffer member made of a material closer to the thermal expansion coefficient of the tube material than the thermal expansion coefficient of the housing material is attached to the inner surface of the support opening, and is fixed between the buffer member and the tube body. The lamp device according to claim 1. 2. The lamp device according to claim 1, wherein the tube is welded to the glass at the support opening.

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