JP2007227196A - Lamp device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp device which is provided with a function capable of preventing stress from occurring and a bulb body from being broken by absorbing deviations formed by differences in thermal expansion coefficient as described above when a closed type lamp device is lighted on. <P>SOLUTION: This is the lamp device which is provided with a lamp main body 20 in which the external terminal 23 protruds from the end face of the bulb body 21, and a housing 10 in which a tightly sealed window hole 11 to emit illumination light from the lamp main body 20 and a support opening 17 to support the lamp body 20 are formed, and in which a reflecting face 14 is formed which guides the illumination light to the window hole 11 by reflecting the same against the inner face. The external terminal 23 is held by a conductive socket 30 at the support opening 17 of the housing 10 slidably in the axial direction of the external terminal, the socket 30 is fixed to the support opening 17 by a hermetically sealed fixing member A in a state of interposing an insulating material, and the end part of the socket 30 is exposed to the housing exterior. <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 emitting source is enclosed in a bulb, and in particular, the lamp body is housed in a housing and reflected light from a reflecting mirror formed on the inner surface of the housing. The present invention relates to a lamp device that performs efficient illumination by using. The lamp device according to the present invention is used as a light source for an image projection projector or the like, or in a poor air environment such as an aircraft or a ship passing through a poor environment such as a sandy desert or a salty sea. Applies to lighting.

In general, a lamp device that generates illumination light in a light emitting region in a bulb by generating a discharge (discharge lamp) between opposed electrodes or heating a filament electrode (incandescent lamp) is widely used. It has been.
In such a lamp device, an electrode for generating light is enclosed in 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.

  A general lamp device is configured such that a tube enclosing an electrode serving as a light emission source is housed in a housing in a state of being open to the outside in order to promote heat dissipation of the tube. However, the lamp device with an open housing is excellent in heat dissipation, but the inside of the housing is contaminated and corroded when the surroundings of the lamp device are in an atmosphere containing dust and corrosive substances (for example, salt). Thus, there is a problem that the amount of light is attenuated and the product life is shortened.

  On the other hand, in the case of lighting used in dangerous places where there are flammable materials in the surrounding area, for example, an explosion-proof lamp in which the lamp body is completely sealed to completely eliminate the possibility of the lamp device becoming a source of ignition. The device is used. The lamp structure having a hermetically sealed structure has a human body protection function because the housing can prevent the glass pieces from being scattered when the tube ruptures for some reason, in addition to the explosion-proof function. On the other hand, the sealed lamp device is difficult to radiate heat from the lamp body due to its structure.

Therefore, a sealed lamp device having a structure in which the cooling effect of the lamp body is enhanced is disclosed. For example, as shown in Patent Document 1, one end sealing tube portion of a lamp body is supported by a reflector (housing), and the other end sealing tube portion of the lamp body is connected to an explosion-proof glass via a ceramic adhesive member. Thus, there is disclosed one in which the sealed end portion is cooled by forming a heat transfer route in contact with both ends of the lamp body.
JP 2004-79225 A

  In the sealed housing lamp device as described in Patent Document 1 above, the occurrence of contamination and corrosion inside the housing can be eliminated, an explosion-proof function and a human body protection function can be realized, and a cooling effect can be achieved. However, there are the following problems. In general, the housing of this type of lamp device is made of an aluminum alloy in order to efficiently cool the heat generated from the tube and to mirror the inner surface to collect the light from the tube. Yes. On the other hand, the tube is made of a glass material such as quartz glass or a ceramic material, and there is a large difference in thermal expansion coefficient between them. In addition, during lighting, a large temperature difference occurs between the temperature of the tube (which may exceed 1000 degrees Celsius in the light emitting region) and the temperature of the housing (about 250 degrees). Therefore, if both ends of the tube are fixed to the housing without taking any special measures, a distortion stress due to a difference in thermal expansion coefficient occurs in a high temperature state at the time of lighting, resulting in problems such as destruction of the tube.

  Therefore, the present invention provides a lamp having a function capable of absorbing the distortion caused by the difference in thermal expansion coefficient as described above to prevent the occurrence of stress and preventing the bulb from being damaged when the lamp device is turned on. An object is to provide an apparatus.

  The lamp device of the present invention made to solve the above problems is formed by supporting an electrode for generating illumination light in a state of being enclosed in a bulb and an external terminal that is electrically connected to the electrode protruding from the end surface of the bulb. A lamp body and a housing for storing and holding the lamp body, and an external terminal of the lamp body is configured to be slidably connected in the axial direction of the external terminal by a conductive socket attached to 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 material of the housing is preferably a metal, such as an aluminum alloy, which is excellent in thermal conductivity and capable of processing a mirror surface with good reflection efficiency on the inner surface.
In addition, the conductive socket refers to a socket having a function of electrically connecting the external terminals of the lamp body in a slidable state in the external terminal axial direction.

According to the present invention, since the conductive socket attached to the housing is held in a state slidable in the direction of the external terminal axis, a deviation due to distortion occurs between the housing and the bulb due to a difference in thermal expansion coefficient during lighting. However, it is possible to prevent the occurrence of stress by absorbing the deviation between the external terminal and the socket, thereby preventing the bulb from being destroyed. As a result, since the lamp body can be used for a long period of time, there is an excellent effect that the life can be extended.
In particular, if the housing has a hermetically sealed structure, the above effects can be exhibited remarkably.

(Means and effects for solving other problems)
In the above invention, the housing includes a reflection surface that reflects illumination light from the light emitting region and guides it to a window hole formed in the housing, and a support opening that supports the lamp body, and the external terminal of the lamp body includes The support opening is slidably held by a conductive socket, and the socket is fixed to the support opening by an airtight fixing member with an insulating material interposed therebetween, and the socket end is It is preferable to have a structure exposed to the outside of the housing.
As a result, while the inside of the housing is completely sealed, the illumination light from the light emitting region can be reflected by the reflecting surface and emitted from the window hole, and the conductive property connected to the external terminal of the lamp body Since the end of the socket is exposed outside the housing, this exposed socket can be used as a connection terminal to the power supply, thereby making a complicated connection such as making a hole in the housing and connecting the power supply line to the bulb The structure can be eliminated, and a completely sealed housing can be obtained.

In the present invention, the housing includes a pair of left and right support openings that hold both ends of the lamp body, and one end of the lamp body is held in one support opening through the socket, and the other end of the lamp body Is preferably fixed to the other support opening by an airtight fixing material.
As a result, the other end of the lamp body is fixed to the housing by an airtight fixing material, so that the lamp body can be stably held in the housing, but the deviation caused by the difference in the thermal expansion coefficient between the housing and the bulb is not It can be absorbed by the socket portion, thereby effectively preventing the breakage of the bulb.

  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.

FIG. 1 is a sectional view of a lamp device according to an embodiment of the present invention. 2 is a perspective view of the lamp device of FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a main part thereof.
The lamp device includes a housing 10 constituted by a body 12 having a window hole 11, a transparent plate glass 13 that hermetically seals the window hole 11, a tubular body 21 having a rod-shaped region on the left and right sides, and an electrode 22. The lamp body 20 is configured.

  The housing 10 is made of an aluminum alloy so as to form an airtight box-shaped block shape. A space for housing the lamp body 20 is formed in the housing 10, and the inner wall surface 14 is a concave reflecting mirror. Mirror finish so that Further, support openings 17 and 17 ′ for holding both end portions of the lamp body 20 are formed on the left and right side walls of the housing 10.

  A stop plate 15 is attached so as to overlap the outer periphery of the plate glass 13 that seals the window hole 11, and the stop plate 15 is fastened to the body 12 using a packing 16 and a screw (not shown). The hole 11 is hermetically sealed.

  A pair of electrodes 22 are linearly arranged inside the tube body of the lamp body 20, and one end side of each electrode 22 is opposed to the center. The other end side of each electrode 22 is extended from both end faces of the tube 21 to become external terminals 23, 23 ′.

  One end of the lamp body 20 is fixed to the one support opening 17 ′ of the housing 10 by an airtight fixing material A ′. The hermetic fixing material A 'is made of an adhesive material such as molten glass or ceramic cement. The external terminal 23 ′ extending from the end face of the tube 21 is exposed outside the housing.

  The other end of the lamp body 20 is supported by inserting the external terminal 23 extending from the end face of the bulb 21 into the socket 30 at the other support opening 17 of the housing 10. The socket 30 is formed of a conductive material such as metal, and a metal spring 32 is built in a socket hole 31 that receives the external terminal 23, and the external terminal 23 is slid elastically and axially through the metal spring 32. I support it as possible.

  The periphery of the socket 30 is integrally joined to an insulating material 33 such as ceramic, and the peripheral surface of the insulating material 33 is fixed to the support opening 17 by an airtight fixing material A made of an adhesive material such as molten glass or ceramic cement. Is fixed. The outer end of the socket 30 is exposed to the outside of the housing 10.

  In the lamp device described above, of the light emitted from the light emitting region of the lamp body 20 (the gap where the electrodes of the counter electrode 22 face each other), the light L1 directed to the window hole 11 is directly emitted from the window hole 11, and The light L <b> 2 that travels toward the inner wall surface 14 is reflected by the concave reflecting mirror formed there and is emitted from the window hole 11. Note that the outer end portion of the socket 30 exposed to the outside of the housing 10 and the external terminal 23 ′ on the opposite side of the housing are used as terminals for power supply connection of the lamp body 20.

  In the lamp device configured as described above, when a deviation occurs between the tube body 21 of the lamp body and the housing 10 due to a difference in coefficient of thermal expansion during lighting, the lamp device 21 has an external terminal 23 and a socket 30. It is possible to prevent the tubular body 21 from being destroyed by sliding the contact points in the axial direction and absorbing the displacement.

  Further, the reflection surface formed on the inner wall surface 14 is not limited to an elliptical shape, and may be a parabolic shape, a planar shape, a polyhedral shape, or the like. Further, the window glass 13 may have a lens function.

  In the above embodiment, the socket 30 is disposed only at one end of the lamp body 20, but the socket 30 may be disposed at both ends of the lamp body 20.

  The lamp device of the present invention is applied to a lighting device or the like. In particular, it is used as a light source for projectors such as image projection, or for lighting in poor air environments such as airplanes and ships that pass through poor environments such as sandy deserts and salty seas. .

Sectional drawing of the lamp device which is one Embodiment of this invention. The perspective view of the lamp device in the said Example. The expanded sectional view of the principal part of the lamp main body in the said Example.

Explanation of symbols

10: Housing 11: Window hole 12: Body 13: Plate glass 17, 17 ': Support opening 20: Lamp body 21: Tube 22: Electrode 23, 23': External terminal 30: Socket A, A ': Airtight fixing material

Claims (4)

  A lamp body that supports an electrode for generating illumination light enclosed in a bulb and that has an external terminal that projects from the end surface of the bulb, and a housing that stores and holds the lamp body. An external terminal of the lamp body is connected to be slidable in the axial direction of the external terminal by a conductive socket attached to the housing.   The lamp device according to claim 1, wherein the housing is configured so that the inside of the housing is airtight in a state where the lamp body is accommodated. The housing includes a reflecting surface that reflects illumination light from the light emitting region and guides it to a window hole formed in the housing, and a support opening that supports the lamp body, and an external terminal of the lamp body includes the support opening. The socket is slidably connected by a conductive socket, and the socket is fixed to the support opening by an airtight fixing material with an insulating material interposed, and the socket end is exposed to the outside of the housing. The lamp device according to claim 1 or 2, wherein the lamp device is provided.   The lamp body has a rod-shaped region formed on both left and right sides and an external terminal projecting from an end face of the rod-shaped region, and the housing includes a pair of support openings for holding the left and right rod-shaped regions of the lamp body, The one end of the main body is hermetically held in one support opening through the socket, and the other end of the lamp body is fixed to the other support opening by an airtight fixing material. 4. The lamp device according to any one of 3.

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