JP4371159B2 - Light source device - Google Patents

Description

  The present invention relates to a light source device used as a light source for a liquid crystal display device or a projection projector device.

Currently, for example, in a liquid crystal display device, a projection projector device, and the like, a light source device configured by combining a light source composed of, for example, a discharge lamp and a reflecting mirror is used.
FIG. 4 is an explanatory diagram showing an outline of a configuration of an example of a light source device using a conventional discharge lamp.
As in the invention described in Japanese Patent Application Laid-Open No. 2002-62586, the light source device is configured such that the discharge lamp 1 is incorporated in the reflecting mirror 3, and the optical axis of the discharge lamp 1 coincides with the central axis of the reflecting mirror 3. Are arranged to be. A neck portion 31 is provided at the center bottom portion 36 of the reflecting mirror 3, a narrow portion 38 is formed on the reflective surface side inside the neck portion 31, and a concave portion 39 is formed following the narrow portion 38. A ring for preventing the adhesive 23 from flowing out is inserted into the sealing portion 12 of the discharge lamp 1, and a base 17 is further fixed. The discharge lamp 1 is fixed by filling the concave portion 39 of the central bottom portion 36 of the reflecting mirror 3 with the adhesive 23.

  Since the discharge lamp 1 becomes high temperature during lighting, a heat-resistant ceramic adhesive 23 that does not melt even when exposed to a high temperature, for example, an adhesive 23 made of silica / alumina is used. The ceramic adhesive 23 has a strong binding force and can firmly bond the glass surface of the reflecting mirror 3 and the glass surface of the sealing tube of the discharge lamp 1. However, since it contains a silicon compound, the ceramic adhesive 23 containing silica generates a volatile substance such as siloxane at a high temperature. Therefore, when siloxane adheres to the surface of the discharge lamp 1 or the reflecting mirror 3, it becomes cloudy and the amount of light decreases.

When the discharge lamp 1 is lit, cooling air flows in the direction of the arrow to prevent overheating. The air inside the reflecting mirror 3 is convected by the cooling air and discharged outside. Since the gas containing siloxane does not stay in the reflecting mirror 3 but is discharged to the outside together with the cooling air, the influence of contamination by siloxane can be reduced to a negligible level.
JP 2002-62586 A

Recently, there is an increasing demand for using the projector apparatus outdoors and in foreign countries with severe external environments. If the cooling air is configured to flow into the reflecting mirror 3, there is a risk that foreign matter in the atmosphere will flow in the cooling air. Since the inside of the projector device becomes a passage for cooling air from the outside of the projector device to the light source device, foreign matters such as sand carried on the cooling air are mixed. Since there is an optical component inside the projector apparatus, there is a possibility that the brightness is reduced due to a decrease in transmittance due to foreign matter in the atmosphere. Therefore, the market demands that the light source device and the optical device be indirectly cooled and hermetically sealed without blowing cooling air directly.
However, if the air is sealed without flowing cooling air, the siloxane-containing gas remains in the closed space inside the reflecting mirror 3, so that if siloxane adheres to the surface of the discharge lamp 1 or the reflecting mirror 3, it becomes cloudy and the amount of light is reduced. The problem of degradation occurs. Further, when siloxane adheres to the arc tube of the discharge lamp, the temperature of the arc tube rises, causing a problem that the lamp life is shortened.

  In view of the above-mentioned problems, the present invention can prevent white turbidity on the surface of a discharge lamp or a reflecting mirror due to siloxane, suppress a decrease in light quantity, and maintain a lamp life even in a sealed light source device that does not allow cooling air to flow. An object is to provide a light source device.

A first invention of the present application includes a discharge lamp having a pair of electrodes in a light emitting portion, sealing portions formed at both ends of the light emitting portion, a reflecting portion that reflects light emitted from the discharge lamp, and a center A reflector constituted by a neck protruding from the bottom,
In the inside of the neck portion, there is a through hole in which a narrow portion from the reflective portion side and a concave portion are formed following the narrow portion,
In the light source device in which one sealing portion of the discharge lamp is inserted into the through hole of the reflecting mirror and fixed by an adhesive filled in the concave portion,
A side surface connecting the narrow portion and the concave portion becomes an abutting surface perpendicular to the tube axis of the discharge lamp,
A first washer inserted through the sealing portion of the discharge lamp and disposed in contact with the abutting surface;
A second washer inserted through the sealing portion of the discharge lamp and disposed in contact with the first washer;
The first washer has an inner diameter that is the outer diameter of the sealing portion of the discharge lamp, and the outer diameter is smaller than the diameter of the recess.
The second washer has an inner diameter larger than the outer diameter of the sealing portion of the discharge lamp, and the outer diameter is the diameter of the recess.
According to a second invention of the present application, in the first invention of the present application, the first washer and the second washer are made of a heat-resistant gasket member.
Further, according to a third invention of the present application, in the first invention of the present application, the first washer has a thickness in the tube axis direction of the discharge lamp having the inner diameter larger than a thickness in the tube axis direction of the discharge lamp having the outer diameter. It is characterized by.
According to a fourth invention of the present application, in the third invention of the present application, the inner surface of the first washer is in contact with the abutting surface, and the inner diameter is the same as the inner diameter of the first washer. The protrusion part smaller than the diameter of this is formed.

  According to the light source device of the present invention, the first washer inserted through the sealing portion of the discharge lamp and disposed in contact with the abutting surface, and the second disposed in contact with the first washer. The first washer and the second washer are brought into close contact with each other by injecting an adhesive into the concave portion from the rear end of the second washer and heating it, so that the first washer and the second washer It is divided into a space on the rear end side from the first washer and a space on the front end side from the first washer and the second washer. Therefore, the gas generated in the space on the rear end side from the first washer and the second washer does not flow into the front end side of the first washer and the second washer 22. As a result, the turbidity due to siloxane is not generated on the surfaces of the discharge lamp and the reflecting mirror, and the decrease in the amount of light can be suppressed. Further, since the temperature of the arc tube of the discharge lamp does not increase due to adhesion of siloxane, a light source device that can maintain the lamp life can be provided.

  A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a light source device according to an embodiment of the present invention. The light source device includes a discharge lamp 1 and a reflecting mirror 3 that surrounds the discharge lamp 1. The optical axis of the reflecting mirror 3 and the arc direction of the discharge lamp 1 substantially coincide with each other, and the arc bright spot of the discharge lamp 1 reflects. It arrange | positions so that it may correspond to the 1st focus of the mirror 3. FIG.

  The reflecting mirror 3 is made of metal or heat-resistant glass, and is a generally bowl-shaped elliptical condensing mirror. The reflecting mirror 3 includes a neck portion 31 and a reflecting portion 32. A dielectric multilayer film is formed on the surface of the reflecting portion 32 facing the discharge lamp 1 to form a reflecting surface. A front glass 34 including a pedestal 35 and a window 34 a is provided in close contact with the front opening 33 of the reflecting mirror 3. The pedestal 35 includes a leg portion 35a, a tapered portion 35b, and a support portion 35c. The leg 35 a has the same shape as the front opening 33 of the reflecting mirror 3 and is in close contact with the front opening 33. The taper portion 35b is led out from the end portion of the leg portion 35a on the discharge lamp 1 side, protrudes forward, and is formed in a taper shape so that the support portion 35c side is tapered. The support portion 35 c is formed so as to go from the end portion of the tapered portion 35 b toward the tube axis direction of the discharge lamp 1, and is formed in front of the end portion of the discharge lamp 1. The window 34a is fixed to the support portion 35c, and is made of a light transmissive member made of, for example, borosilicate glass.

  The neck portion 31 is provided so as to protrude in a columnar shape from the central bottom portion 36 of the reflecting portion 32 toward the rear, and a through hole 37 is formed inside the neck portion 31. A cylindrical narrow portion 38 is formed on the reflective portion 32 side of the through hole 37, and a cylindrical concave portion 39 having a diameter larger than that of the narrow portion 38 is formed following the narrow portion 38. A side surface connecting the narrow portion 38 and the concave portion 39 is formed perpendicular to the tube axis of the discharge lamp and forms a donut-shaped butting surface 40.

  A discharge vessel 10 of the discharge lamp 1 is made of quartz glass, and includes a substantially spherical light emitting portion 11 and rod-shaped sealing portions 12 a and 12 b that extend from both ends of the light emitting portion 11. A pair of electrodes 13 are arranged opposite to each other. A metal foil 14 is embedded in the sealing portions 12a and 12b, and an end portion of the electrode 13 is welded to one end portion of the metal foil 14 to be electrically connected. Further, an external lead 15 protruding outward is welded to the other end of the metal foil 14. An external trigger 16 formed by winding a metal wire is disposed on the outer surfaces of the sealing portions 12a and 12b. By supplying power to the external lead 15, a discharge is generated between the electrodes 13. In addition, when applied to the external trigger 16 at the start of power supply to the external lead 15, ionization of the discharge medium in the light emitting unit 11 can be promoted, and dielectric breakdown between the electrodes 13 can be facilitated.

  Since one sealing portion 12b of the discharge lamp 1 is disposed inside the reflecting mirror 3 which is a closed space, it is necessary to connect the power supply line 42 from the outside of the reflecting mirror 3 to the external lead 15. Since the front glass 34 cannot be perforated, the reflector 3 is perforated through the feeder line 42. Further, since the external trigger 16 is also arranged in the reflecting mirror 3, it is necessary to make a hole in the reflecting mirror 3 and extend the power supply line. A hole is made in the reflecting mirror 3 to pass a spacer 41, and a power supply line 42 is passed inside the spacer 41. An adhesive 43 is filled between the power supply line 42 and the spacer 41 so that the atmosphere does not flow into the reflector 3 from between the power supply line 42 and the spacer 41. Thus, the inside of the reflecting mirror 3 is a closed space where convection communicating with the outside does not occur. Therefore, it is possible to prevent foreign matters such as sand from entering the projector device. Further, in the unlikely event that the discharge lamp 1 is damaged, it is possible to prevent the fragments from being scattered.

  A first washer 21 and a second washer 22 are inserted into one sealing portion 12 a of the discharge lamp 1. Since the base is not formed at the outer end of the discharge lamp 1, the diameter of the sealing portion 12 a is the same over the entire length, and the first washer 21 and the second washer 22 can be easily inserted. The first washer 21 is inserted on the reflecting portion 32 side and is in contact with the abutting surface 40. The outer diameter 21 b of the first washer 21 is smaller than the diameter of the concave portion 39 of the neck portion 31 of the reflecting mirror 3 and larger than the diameter of the narrow portion 38. The inner diameter 21 a of the first washer 21 is the outer diameter of the sealing portion 12 a of the discharge lamp 1. The second washer 22 is inserted through the outer end side of the neck portion 31 and is in contact with the first washer. The inner diameter 22 a of the second washer 22 is larger than the outer diameter of the sealing portion 12 a of the discharge lamp 1 and smaller than the outer diameter 21 b of the first washer 21. The outer diameter 22 b of the second washer 22 is the diameter of the recess 39 of the neck 31 of the reflecting mirror 3.

  The 1st washer 21 and the 2nd washer 22 are formed by the member used for the sealing material for fixation used in order to ensure airtightness and watertightness, ie, a gasket. In order to increase the airtightness, a softer is preferable, but a rigidity that does not easily bend is required. Moreover, since the discharge lamp 1 becomes high temperature at the time of lighting, it needs to be a heat resistant gasket member. For this reason, there are members that are applied to cylinder head gaskets for automobiles, such as mica sheets, those using graphite, thin metal plates (stainless steel, copper), and members sandwiched between thin plate stainless steels. It can be used suitably.

  The sealing portion 12a into which the first washer 21 and the second washer 22 are inserted is inserted into the through hole 37 of the neck portion 31 of the reflecting mirror 3, and the first washer 21 abuts against the abutting surface 40. ing. The concave portion 39 is filled with the adhesive 23 from the outer end side of the neck portion 31, and the sealing portion 12 a is fixed in the concave portion 39 of the reflecting mirror 3 by the adhesive 23. As the adhesive 23, a heat-resistant ceramic adhesive that does not melt even when exposed to a high temperature, for example, an adhesive made of silica / alumina or the like is used. The ceramic adhesive has a strong binding force and can firmly bond the glass surface of the reflecting mirror 3 and the glass surface of the sealing tube of the discharge lamp 1.

Next, a method for fixing the discharge lamp 1 and the reflecting mirror 3 will be described. FIG. 2 is a cross-sectional view used for explaining the fixing method of the light source device of the present invention.
As shown in FIG. 2A, first, one sealing portion 12 a of the discharge lamp 1 is inserted from the front opening 33 side of the reflecting mirror 3 into the through hole 37 of the neck portion 31. This is because the diameter of the narrow portion 38 of the neck portion 31 is smaller than the diameter of the light emitting portion 11 of the discharge lamp 1. Subsequently, the first washer 21 is inserted from the outer end side of the neck portion 31 into the sealing portion 12 a inserted through the neck portion 31, and then the second washer 22 is inserted. Since the outer diameter of the first washer 21 is smaller than the diameter of the recess 39 and the inner diameter of the second washer 22 is larger than the outer diameter of the sealing portion 12, the discharge lamp 1 is inserted into the through hole 37 of the neck portion 31 of the reflecting mirror 3. The discharge lamp 1 can be freely moved in a direction perpendicular to the tube axis in a state where the first washer 21 and the second washer 22 are provided in the sealing portion 12. That is, the position of the discharge lamp 1 can be adjusted in a state in which the sealing part 12 includes the first washer 21 and the second washer 22.

  As shown in FIG. 2B, the position is adjusted so that the amount of light emitted from the light source device is maximized, that is, the arc bright spot of the discharge lamp 1 coincides with the first focal point of the reflecting mirror 3. Then, the positions of the discharge lamp 1 and the reflecting mirror 3 are fixed. The first washer 21 is brought into contact with the abutting surface 40 of the reflecting mirror 3, and the second washer 22 is brought into contact with the first washer 21. Thereafter, the adhesive 23 is filled from the rear end side of the neck portion 31. Since an air layer that is not filled with the adhesive 23 is formed between the inner diameter of the second washer 22 and the outer diameter of the sealing portion 12, the adhesive 23 travels along the side surface of the sealing portion 12 to the light emitting portion 11 side. Leakage can be prevented more effectively.

  After injecting the adhesive agent 23 into the recess 39 densely, the adhesive agent 23 is cured by heating from the rear end side of the neck portion 31. Since heating is performed from the rear end side of the neck portion 31, the adhesive 23 is also cured by moisture and gas from the rear end side, and pressure is applied to the inside of the adhesive 23. This pressure presses the second washer 22, eliminates the gap between the second washer 22 and the first washer 21, and the gap between the first washer 21 and the abutting surface 40, and the second washer. 22, the first washer 21 and the abutting surface 40 are in close contact with each other. Further, the fact that the first washer 21 and the second washer 22 are formed of a soft member also makes it difficult to form a gap between the first washer 21 and the second washer 22.

  Although siloxane is generated when the adhesive 23 is heated, the siloxane-containing gas is brought together with the wind by working while convection the inside of the reflecting mirror 3 with the front glass 34 not provided. By discharging to the outside, adhesion of siloxane can be prevented. In order to prevent white turbidity on the surface of the discharge lamp and the reflecting mirror due to siloxane released during production, the discharge lamp 1 is fixed with the adhesive 23 and the power supply line 42 is fixed with the adhesive 43, and then the front glass 34 is disposed. It will be.

  As described above, the first washer 21 and the second washer 22 are brought into close contact with each other, the rear end side of the first washer 21 and the second washer 22, the first washer 21 and the second washer 22 are in contact with each other. It is divided into a space on the tip side from the washer 22. Therefore, the gas generated in the space at the rear end side from the first washer 21 and the second washer 22 does not flow into the front end side from the first washer 21 and the second washer 22. That is, even if the adhesive 23 filled in the recess 39 is heated to generate siloxane, it is released only into the space on the rear end side from the first washer 21 and the second washer 22, and the gas containing siloxane is released. The first washer 21 and the second washer 22 do not flow out to the reflecting part of the reflecting mirror. As a result, the turbidity due to siloxane is not generated on the surfaces of the discharge lamp 1 and the reflecting mirror 3, and the decrease in the amount of light can be suppressed. Moreover, since the temperature rise of the arc tube 11 of the discharge lamp 1 due to adhesion of siloxane does not occur, the lamp life can be maintained.

Subsequently, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view illustrating a light source device according to an embodiment of the present invention.
In the first washer 21 of the second embodiment, the thickness of the discharge lamp 1 with the inner diameter 21a in the tube axis direction is larger than the thickness of the discharge lamp 1 with the outer diameter 21b in the tube axis direction. Specifically, a step is provided on the side surface of the first washer 21 that is in contact with the abutting surface 40, and the portion that contacts the sealing portion 12 a of the discharge lamp 1 protrudes so as to rise to the reflecting portion 32 side of the reflecting mirror 3. A portion 21c is formed. The protruding portion 21 c is substantially ring-shaped, the inner diameter of the protruding portion 21 c coincides with the inner diameter 21 a of the first washer 21, and the outer diameter of the protruding portion 21 c is smaller than the diameter of the narrow portion 38.

  By increasing the thickness of the inner diameter 21a of the first washer 21 in the tube axis direction of the discharge lamp 1, the contact area with the sealing portion 12a of the discharge lamp 1 is formed as a protrusion 21c as shown in FIG. The first washer 21 can be made larger than the first washer 21 and the airtightness between the first washer 21 and the sealing portion 12a of the discharge lamp 1 can be improved. Thus, it is possible to more effectively prevent the gas containing siloxane from flowing out of the gap between the first washer 21 and the sealing portion 12a of the discharge lamp 1. Moreover, it can prevent more effectively that the adhesive agent 23 leaks to the light emission part 11 side along the side surface of the sealing part 12a at the time of fixation of the discharge lamp 1. FIG.

  In addition, since the outer diameter of the protruding portion 21c is smaller than the narrow portion 38, the first washer 21 is disposed so as to protrude the protruding portion 21c toward the reflecting portion 32, so the second of the first washer 21 The side surface that contacts the washer 22 can be disposed so as to be in the same position as the first washer 21 in which the protruding portion 21c is not formed as shown in FIG. That is, even if the thickness of the inner diameter 21a of the first washer 21 in the tube axis direction of the discharge lamp 1 is increased, the protruding portion 21c only protrudes from the narrow portion 38, so that the second washer 22 is The length in the tube axis direction of the discharge lamp 1 up to the side surface in contact with the adhesive 23 is the same as that when the first washer 21 having no protrusion 21c is used as shown in FIG. Therefore, even if the first washer 21 is provided with the protruding portion 21c, the amount of the adhesive 23 that can be injected into the recess 39 does not change, and the discharge lamp 1 can be reliably fixed.

  In the above, an example in which a front glass 34 is formed in the front opening 33 of the reflecting mirror 3 to realize a hermetically sealed light source device that does not allow cooling air to flow in is shown. However, a discharge lamp fixed to the reflecting mirror 3 has been shown. It is also possible to realize a hermetically sealed light source device in which 1 is placed in a hermetically sealed container so that cooling air does not flow.

Next, examples performed on the light source device of the present invention will be described.
As shown in FIG. 1, the inner diameter is the outer diameter of the sealing portion, the outer diameter is smaller than the diameter of the recess, the inner diameter is larger than the outer diameter of the sealing portion, and the outer diameter is the diameter of the recess. A light source device having a second washer is manufactured. The discharge lamp was turned on for 100 hours, and the presence or absence of white turbidity on the surface of the discharge lamp or reflecting mirror caused by siloxane after lighting was observed. And it confirmed that whitening by siloxane did not generate | occur | produce.

As a comparative experiment, with respect to the light source device according to the prior art shown in FIG. 4, the discharge lamp was turned on for 100 hours, and the presence or absence of white turbidity on the surface of the discharge lamp or reflecting mirror due to siloxane after lighting was observed. It was confirmed that siloxane adhered to the reflecting surface of the reflecting mirror and turned white. In addition, in the light source device according to the related art shown in FIG. Also in this light source device, it was confirmed that siloxane adhered to the reflecting surface of the reflecting mirror and turned white.

Sectional drawing which shows the light source device of this invention Sectional drawing used in order to demonstrate the fixing method of the light source device of this invention Sectional drawing which shows the light source device of this invention Sectional view showing a conventional light source device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Discharge lamp 10 Discharge lamp 11 Light emission part 12 Sealing part 15 External lead 16 External trigger 21 1st washer 22 2nd washer 23 Adhesive 3 Reflective mirror 34 Front glass 37 Through-hole 38 Narrow part 39 Recess 40 Abutting surface

Claims (4)

A discharge lamp having a pair of electrodes in the light emitting part, and a sealing part formed at both ends of the light emitting part, a reflecting part for reflecting light emitted from the discharge lamp, and a neck part protruding from the center bottom part A configured reflector,
In the inside of the neck portion, there is a through hole in which a narrow portion from the reflective portion side and a concave portion are formed following the narrow portion,
In the light source device in which one sealing portion of the discharge lamp is inserted into the through hole of the reflecting mirror and fixed by an adhesive filled in the concave portion,
A side surface connecting the narrow portion and the concave portion becomes an abutting surface perpendicular to the tube axis of the discharge lamp,
A first washer inserted through the sealing portion of the discharge lamp and disposed in contact with the abutting surface;
A second washer inserted through the sealing portion of the discharge lamp and disposed in contact with the first washer;
The first washer has an inner diameter that is the outer diameter of the sealing portion of the discharge lamp, and the outer diameter is smaller than the diameter of the recess.
The second washer has an inner diameter larger than an outer diameter of a sealing portion of the discharge lamp, and an outer diameter is a diameter of a concave portion. The light source device according to claim 1, wherein the first washer and the second washer are made of a heat resistant gasket member. 2. The light source device according to claim 1, wherein a thickness of the first washer in a tube axis direction of a discharge lamp having an inner diameter is larger than a thickness in a tube axis direction of a discharge lamp having an outer diameter. A protruding portion is formed on the side surface of the first washer that is in contact with the abutting surface, the inner diameter of which corresponds to the inner diameter of the first washer and the outer diameter of which is smaller than the diameter of the narrow portion. The light source device according to claim 3.

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