JP2010218870A - Light source device, projector, and manufacturing method of arc tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of restraining a site of connection of a metal foil and a lead wire from getting high in temperature. <P>SOLUTION: The light source device 110 is provided with a tube part 30, a first electrode 42 as well as a second electrode 52, a first metal foil 44 as well as a second metal foil 54, a first sealing part 40 as well as a second sealing part 50, an arc tube 20 equipped with a first lead wire 46 and a second lead wire 56, and a reflector 10, of which, the first sealing part 40 has a narrowed part 60 extended along a peripheral direction of the first sealing part 40 at a site further toward the first lead wire 46 side than a site where the first electrode 42 and the first metal foil 44 are connected, and that, at a site further toward the first electrode 42 side than a site where the first metal foil 44 and the first lead wire 46 are connected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light source device, a projector, and a method for manufacturing an arc tube.

  Conventionally, as a light source device for an illumination device of a projector, a tube portion, a pair of electrodes built in the tube portion, a pair of metal foils electrically connected to the pair of electrodes, and a pair of metal foils A light emitting tube having a pair of sealing portions for sealing each of the electrodes, a pair of lead wires electrically connected to the pair of metal foils, respectively, and a reflector for reflecting the light emitted from the light emitting tube to the illuminated region Is known (for example, refer to Patent Document 1).

JP 2005-5183 A

  In recent years, there has been a demand for higher brightness and smaller size of projectors. In such a projector, the location where the metal foil and the lead wire are connected, particularly the location on the illuminated area side, is likely to be hot. When the location where the metal foil and the lead wire are connected to a high temperature increases the possibility of failure due to the oxidation of the material or the difference in the coefficient of thermal expansion between the materials, a means for suppressing this is required.

  Then, this invention was made | formed in view of the said situation, and it aims at providing the light source device which can suppress that the location where metal foil and a lead wire are connected becomes high temperature. Another object of the present invention is to provide a highly reliable projector including such an excellent light source device. Moreover, it aims at providing the manufacturing method of the arc tube for using for the light source device of this invention.

  The light source device of the present invention includes a tube portion, a pair of electrodes built in the tube portion, a pair of metal foils electrically connected to the pair of electrodes, and the pair of metal foils, respectively. An arc tube having a pair of sealing portions to be sealed and a pair of lead wires electrically connected to the pair of metal foils respectively, and a reflector for reflecting light emitted from the arc tube to an illuminated area The electrode on the illuminated region side of the pair of electrodes is a first electrode, the electrode for the first electrode is a second electrode, and the pair of metal foils is the light source device. The metal foil connected to the first electrode is the first metal foil, the metal foil for the first metal foil is the second metal foil, and the seal that seals the first metal foil of the pair of sealing portions. The stop portion is the first sealing portion, and the sealing portion for the first sealing portion is the second seal. Of the pair of lead wires, the lead wire connected to the first metal foil is the first lead wire, and the lead wire for the first lead wire is the second lead wire, The stop portion is closer to the first lead wire than the location where the first electrode and the first metal foil are connected, and from the location where the first metal foil and the first lead wire are connected. Has a constricted portion extending along the circumferential direction of the first sealing portion at a location on the first electrode side.

  For this reason, according to the light source device of the present invention, the first sealing portion on the illuminated area side is located on the first electrode side from the location where the first metal foil and the first lead wire are connected. Since the constricted portion extends along the circumferential direction of the first sealing portion, the constricted portion restricts heat conduction from the tube portion, which is the main heat source, and the first metal foil and the first lead. It becomes possible to suppress that the location where a line is connected becomes high temperature.

  In the light source device of the present invention, the second sealing portion is closer to the second lead wire than the portion where the second electrode and the second metal foil are connected, and the second metal foil. It is preferable to have a constricted portion extending along the circumferential direction of the second sealing portion at a location closer to the second electrode than a location where the second lead wire is connected.

  By adopting such a configuration, the constricted part restricts heat conduction from the tube part, which is the main heat source, and the part where the second metal foil and the second lead wire are connected is heated. It becomes possible to suppress.

  In the light source device of the present invention, it is preferable that any one of the first sealing portion and the second sealing portion has two or more constricted portions.

  By setting it as such a structure, it becomes possible to restrict | limit the heat conduction from a bulb part more strongly, and to suppress effectively that the location where a metal foil and a lead wire are connected becomes high temperature.

  In the light source device of the present invention, it is preferable that the constricted portion has a substantially circular cross section when the constricted portion is cut along a virtual plane perpendicular to the axis of the pair of sealing portions.

  By adopting such a configuration, it is possible to obtain an arc tube that is uniformly durable against impacts from various directions.

  In the light source device of the present invention, the constricted portion is formed on the foil surface of the pair of metal foils in the cross section when the constricted portion is cut along a virtual plane perpendicular to the axis of the pair of sealing portions. The length in the vertical direction is preferably shorter than the length in the parallel direction.

  By adopting such a configuration, it becomes possible to make the arc tube particularly durable against an impact from a direction substantially parallel to the foil surfaces of the pair of metal foils.

  The projector of the present invention projects an illumination device including the light source device of the present invention, a light modulation device that modulates illumination light from the illumination device according to image information, and a modulated light from the light modulation device as a projection image. A projection optical system.

  For this reason, the projector of this invention turns into a reliable projector provided with the outstanding light source device.

  The projector of the present invention projects an illumination device including the light source device of the present invention, a light modulation device that modulates illumination light from the illumination device according to image information, and a modulated light from the light modulation device as a projection image. In the light source device of the present invention, in the light source device of the present invention, the constricted portion is a cross section when the constricted portion is cut along a virtual plane perpendicular to the axis of the pair of sealing portions. In the cross section, the length in the direction perpendicular to the foil surface of the pair of metal foils is shorter than the length in the parallel direction. It is arranged so as to be substantially parallel to the direction.

  For this reason, the projector of this invention turns into a reliable projector provided with the outstanding light source device. Further, in the state of use, the light source device is disposed so that the foil surfaces of the pair of metal foils are substantially parallel to the direction of gravity. Since the arc tube of the light source device is particularly durable against the impact from the direction, the projector is highly durable against the impact from the direction of gravity that is likely to occur in actual use. .

  The arc tube manufacturing method for use in the light source device of the present invention corresponds to the arc tube tube preparation step of preparing the arc tube tube in which the tube portion is formed, and the constricted portion of the arc tube tube A heating and stretching step of locally heating and stretching a place to be stretched, and an arc tube manufacturing step of manufacturing the arc tube by a shrink seal method using the arc tube base tube are included in this order. .

  For this reason, according to the arc tube manufacturing method of the present invention, a place corresponding to the constricted portion of the arc tube base tube is locally heated and includes a heating and stretching step of stretching, so that the arc tube having the constricted portion is It becomes possible to manufacture without preparing a special apparatus. In addition, since the region including the constricted portion is heated by the shrink seal method, distortion and microcracks that may occur in the heat stretching process are removed, and the intensity of the arc tube does not decrease due to these.

  An arc tube manufacturing method for use in the light source device according to the present invention corresponds to an arc tube base tube preparing step for preparing an arc tube base tube in which the bulb portion is formed, and the constricted portion in the arc tube base tube. A removal processing step of removing a part of the surface of the place to be performed, and an arc tube manufacturing step of manufacturing the arc tube by a shrink seal method using the arc tube base tube in this order.

  For this reason, according to the arc tube manufacturing method of the present invention, since the removal processing step for removing a part of the surface of the arc tube tube corresponding to the constricted portion is included, the location, depth and shape are accurate. It becomes a constricted part. In addition, since the region including the constricted portion is heated by the shrink seal method, distortion and microcracks that may occur in the removal processing step are removed, and the intensity of the arc tube does not decrease due to these.

  An arc tube manufacturing method for use in the light source device of the present invention includes an arc tube preparation step of preparing an arc tube having no constricted portion, and a part of the surface of the arc tube corresponding to the constricted portion. A removal processing step to be removed and a constriction portion forming step for forming the constriction portion by heat-treating a region including the portion removed in the removal processing step are included in this order.

  For this reason, according to the manufacturing method of the arc tube of the present invention, it is possible to form a constricted portion later on an arc tube that is generally sold and to make an arc tube for use in the light source device of the present invention. In addition, since it includes a step of heat-treating the region including the removed portion in the removal processing step, distortion and microcracks that may occur in the removal processing step are removed, resulting in a decrease in the intensity of the arc tube. Disappears.

FIG. 3 is a top view showing an optical system of the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the light source device 110 which concerns on Embodiment 1. FIG. 3 is a flowchart showing a method for manufacturing the arc tube according to the first embodiment. The figure shown in order to demonstrate the manufacturing method of the arc_tube | light_emitting_tube concerning Embodiment 1. FIG. 9 is a flowchart showing a method for manufacturing an arc tube according to a second embodiment. The figure shown in order to demonstrate the manufacturing method of the arc_tube | light_emitting_tube concerning Embodiment 2. FIG. 9 is a flowchart showing a method for manufacturing an arc tube according to a third embodiment. The figure shown in order to demonstrate the manufacturing method of the arc_tube | light_emitting_tube concerning Embodiment 3. FIG. The figure shown in order to demonstrate the light source device 110c which concerns on Embodiment 4. FIG. FIG. 10 is a side view schematically showing a light source device 110d according to a fifth embodiment. The figure shown in order to demonstrate the light source device 110e which concerns on Embodiment 6. FIG.

  The light source device, projector, and arc tube manufacturing method of the present invention will be described below based on the embodiments shown in the drawings.

[Embodiment 1]
1. Configuration of Light Source Device 110 and Projector 1000 FIG. 1 is a top view showing an optical system of a projector 1000 according to the first embodiment.
FIG. 2 is a diagram for explaining the light source device 110 according to the first embodiment. 2A is a side view showing the light source device 110, FIG. 2B is an enlarged view of the range A1 in FIG. 2A, and FIG. 2C is FIG. It is B1-B1 sectional drawing of b).
1 and 2 are schematic diagrams, and the thickness and the like of the first metal foil 44 and the second metal foil 54 are exaggerated for display.

  In the following description, three directions orthogonal to each other are defined as a z-axis direction (illumination optical axis 100ax direction in FIG. 1), an x-axis direction (a direction parallel to the paper surface in FIG. 1 and perpendicular to the z-axis), and y. Let it be an axial direction (a direction perpendicular to the paper surface in FIG. 1 and perpendicular to the z-axis).

  As shown in FIG. 1, the projector 1000 according to the first embodiment includes an illumination device 100, a color separation light guide optical system 200, three liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500, and a projection optical system. 600 is a projector.

  The illumination device 100 includes a light source device 110, a concave lens 90, a first lens array 120, a second lens array 130, a polarization conversion device 140, and a superimposing lens 150, and emits illumination light to the illuminated region side.

  As shown in FIGS. 1 and 2, the light source device 110 includes an ellipsoidal reflector 10 and an arc tube 20, and emits light along the illumination optical axis 100ax.

  As shown in FIG. 2, the ellipsoidal reflector 10 includes an opening 12 into which a second sealing portion 50 described later is inserted and fixed, and a reflecting surface that reflects light from the arc tube 20 toward the second focal position. 14. The ellipsoidal reflector 10 is fixed to the second sealing portion 50 of the arc tube 20 with an adhesive such as cement C filled in the opening 12.

  The arc tube 20 includes a tube portion 30, a first electrode 42 and a second electrode 52 as a pair of electrodes, a first metal foil 44 and a second metal foil 54 as a pair of metal foils, and a pair of seals. The first sealing portion 40 and the second sealing portion 50 as a portion, and the first lead wire 46 and the second lead wire 56 as a pair of lead wires. As the arc tube 20, various arc tubes that emit light with high luminance can be employed, for example, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like.

  The tube portion 30 includes a first electrode 42 and a second electrode 52 as a pair of electrodes. In addition, mercury, a rare gas, and a small amount of halogen are enclosed in the tube portion 30. The tube portion 30 is made of, for example, quartz glass. When a potential difference is generated between the first electrode 42 and the second electrode 52, a discharge occurs and an arc image is generated. This arc image is a light emitting part, and the light emitting part is located in the vicinity of the first focal point of the ellipsoidal reflector 10. The first electrode 42 and the second electrode 52 are, for example, tungsten electrodes.

The first metal foil 44 and the second metal foil 54 are electrically connected to the first electrode 42 and the second electrode 52, respectively. The first metal foil 44 and the second metal foil 54 are, for example, molybdenum foils.
The 1st sealing part 40 and the 2nd sealing part 50 seal the 1st metal foil 44 and the 2nd metal foil 54, respectively. The 1st sealing part 40 and the 2nd sealing part 50 consist of quartz glass, for example.
The first lead wire 46 and the second lead wire 56 are electrically connected to the first metal foil 44 and the second metal foil 54, respectively. The first lead wire 46 and the second lead wire 56 are made of, for example, molybdenum or tungsten.

The first sealing portion 40 is closer to the first lead wire 46 than the portion where the first electrode 42 and the first metal foil 44 are connected, and the first metal foil 44 and the first lead wire 46 are connected to each other. A constricted portion 60 extending along the circumferential direction of the first sealing portion 40 is provided at a location closer to the first electrode 42 than the location to be formed.
As shown in FIG. 2C, the constricted portion 60 is cut at a virtual plane perpendicular to the axis of the pair of sealing portions (same as the illumination optical axis 100ax), for example, a plane including B1-B1. The cross section is substantially circular.

  As shown in FIG. 1, the concave lens 90 is disposed on the illuminated area side of the ellipsoidal reflector 10. The concave lens 90 is configured to substantially parallelize the light from the ellipsoidal reflector 10.

  The first lens array 120 has a function as a light beam splitting optical element that splits light emitted from the light source device 110 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax. A plurality of first small lenses 122 are provided. Although the description by illustration is omitted, the outer shape of the first small lens 122 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B described later.

  The second lens array 130 is an optical element that collects a plurality of partial light beams divided by the first lens array 120 described above, and in the same manner as the first lens array 120, a matrix is formed in a plane orthogonal to the illumination optical axis 100ax. A plurality of second small lenses 132 arranged in a shape.

The polarization conversion device 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion device 140 omits a detailed description by illustration, but transmits one linear polarization component of the polarization components included in the illumination light from the illumination device 100 as it is, and transmits the other linear polarization component to the illumination optical axis 100ax. A polarization separation layer that reflects in the vertical direction (x-axis direction), a reflection layer that reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax (z-axis direction), and reflection A retardation plate that converts the other linearly polarized light component reflected by the layer into one linearly polarized light component.

  The superimposing lens 150 condenses a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion device 140, and superimposes them in the vicinity of the image forming area in the liquid crystal devices 400R, 400G, and 400B. It is an optical element. The superimposing lens 150 shown in FIG. 1 is composed of a single lens, but may be composed of a compound lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, and relay lenses 260 and 270. The color separation light guide optical system 200 separates the illumination light emitted from the illumination device 100 into three color lights of red light, green light, and blue light, and the respective color lights are liquid crystal devices 400R, 400G, and 400 to be illuminated. It has a function leading to 400B.

  The dichroic mirrors 210 and 220 are optical elements in which a wavelength selection film that reflects light in a predetermined wavelength region and transmits light in other wavelength regions is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that reflects a red light component and transmits other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that reflects the green light component and transmits the blue light component.

  The red light component reflected by the dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 400R for red light through the condenser lens 300R.

  The condenser lens 300R is provided to convert each partial light beam from the superimposing lens 150 into a light beam substantially parallel to each principal ray. The condensing lenses 300G and 300B disposed in the preceding stage of the optical path of the other liquid crystal devices 400G and 400B are configured in the same manner as the condensing lens 300R.

  Of the green light component and the blue light component that have passed through the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming region of the green light liquid crystal device 400G. On the other hand, the blue light component passes through the dichroic mirror 220 and passes through the relay lens 260, the incident-side reflection mirror 240, the relay lens 270, the emission-side reflection mirror 250, and the condensing lens 300B, and the blue light liquid crystal device. The light enters the 400B image forming area. The relay lenses 260 and 270 and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal device 400B.

  The reason why the relay lenses 260 and 270 and the reflection mirrors 240 and 250 are provided in the optical path of blue light is that the length of the optical path of blue light is longer than the length of the optical path of other color light. This is to prevent a decrease in light use efficiency due to divergence of light. The projector 1000 according to the first embodiment has such a configuration because the length of the optical path of blue light is long. However, the length of the optical path of red light is increased, and the relay lenses 260 and 270 and the reflection mirror are configured. A configuration using 240 and 250 in the optical path of red light is also conceivable.

The liquid crystal devices 400R, 400G, and 400B modulate incident illumination light according to image information to form a color image, and are illumination targets of the illumination device 100. Although not shown, incident-side polarizing plates are disposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, respectively, and the liquid crystal devices 400R, 400G, and 400B are cross dichroic. An exit-side polarizing plate is disposed between each prism 500. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each incident color light.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, a polysilicon TFT is used as a switching element and incident according to a given image signal Modulates the polarization direction of one type of linearly polarized light emitted from the side polarizing plate.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  As described above, the light source device 110 according to the first embodiment includes the first sealing unit 40 on the first lead wire side 46 from the location where the first electrode 42 and the first metal foil 44 are connected. And the constriction part 60 extended along the circumferential direction of the 1st sealing part 40 in the place which is the 1st electrode side 42 rather than the location where the 1st metal foil 44 and the 1st lead wire 46 are connected. Have.

2. FIG. 3 is a flowchart showing a method for manufacturing an arc tube according to the first embodiment.
FIG. 4 is a view for explaining the manufacturing method of the arc tube according to the first embodiment. FIG. 4A to FIG. 4D are schematic views for explaining each process, and FIG. 4E is a schematic view showing the manufactured arc tube 20.

  The arc tube manufacturing method according to the first embodiment is a method for manufacturing the arc tube 20 for use in the light source device 110 according to the first embodiment. As shown in FIG. "Step S10", "heating and stretching step S12" and "arc tube manufacturing step S14" are included in this order. Hereinafter, these steps will be sequentially described.

A. Arc tube preparation process S10
First, the arc tube base tube 70 is prepared (see FIG. 4A). The arc tube 70 has a bulb portion 30 formed in a substantially central portion, and is made of, for example, quartz glass. About the manufacturing method of the arc_tube | light_emitting_tube base tube 70, a conventionally well-known means shall be used and description is abbreviate | omitted.

B. Heat stretching step S12
Next, as shown in FIG. 4A, after locally heating a location 72 corresponding to the constricted portion of the arc tube 70, the end of the tube portion 74 is moved away from the tube portion 30. The pipe part 74 is partially stretched. When the heating and stretching step is completed, as shown in FIG. 4B, a portion that becomes the base of the constricted portion is formed. The tube portion 74 corresponds to the first sealing portion 40 of the arc tube 20, and the tube portion 76 corresponds to the second sealing portion 50 of the arc tube 20, but the tube portions 74 and 76 correspond to the respective sealing portions. It is configured to be somewhat longer than the stop.

C. Arc tube manufacturing process S14
Further, the arc tube 20 is manufactured by the shrink seal method using the arc tube 70. Specifically, inside the arc tube 70, the first electrode 42 and the second electrode 52, the first metal foil 44 and the second metal foil 54, the first lead wire 46 and the second lead wire 56, and the like are not shown. Necessary substances such as mercury, rare gas, halogen and the like are put, the inside of the arc tube base tube 70 is made negative by decompression, and the ends of the tube portions 74 and 76 are closed with plugs (not shown). In this state, as shown in FIG. 4C, when the tube portions 74 and 76 are heated, the material constituting the tube portions 74 and 76 is softened. As a result, the internal space of the tube portions 74 and 76 is sufficiently reduced by the negative pressure, the first metal foil 44 and the second metal foil 54 are sealed, and the internal structure of the arc tube 20 is completed. For example, a hydrogen-oxygen burner can be used for the heating. Thereafter, as shown in FIG. 4 (d), both ends of the tube portions 74 and 76 are cut to a predetermined length to form a first sealing portion 40 and a second sealing portion 50, respectively.
As shown in FIG. 4B, a constriction is formed in each of the locations 72 corresponding to the constricted portions, both outside and inside the tube, but the constriction inside the tube reduces the internal space of the tube portion 74. Sometimes disappears.

  By performing the above steps, the arc tube 20 can be manufactured as shown in FIG.

3. Advantageous Effects As described above, the light source device 110 according to the first embodiment is from the place where the first metal foil 44 and the first lead wire 46 are connected to the first sealing portion 40 on the illuminated area side. Since the constricted portion 60 extends along the circumferential direction of the first sealing portion 40 at a location on the first electrode 42 side, the constricted portion conducts heat conduction from the tube portion which is a main heat source. It is possible to limit and prevent the location where the first metal foil 44 and the first lead wire 46 are connected from becoming high temperature.

  In addition, according to the light source device 110 according to the first embodiment, the constricted portion 60 has a substantially circular cross section when cut by a virtual plane perpendicular to the axis of the pair of sealing portions, and thus, from various directions. It becomes possible to make the arc tube uniformly durable against impact.

  In addition, since the projector 1000 according to the first embodiment includes the light source device 110 according to the first embodiment, the projector 1000 is a highly reliable projector including an excellent light source device.

  In addition, since the arc tube manufacturing method according to the first embodiment includes a heating and stretching process in which the location 72 corresponding to the constricted portion of the arc tube base tube 70 is locally heated and stretched, the arc tube having the constricted portion 60. 20 can be manufactured without preparing a special apparatus. In addition, since the region including the constricted portion 60 is heated by the shrink seal method, distortion and microcracks that may occur in the heat stretching process are removed, and the strength of the arc tube 20 is not reduced due to these. .

[Embodiment 2]
FIG. 5 is a flowchart showing a method of manufacturing the arc tube according to the second embodiment.
FIG. 6 is a view for explaining the method of manufacturing the arc tube according to the second embodiment. FIG. 6A to FIG. 6D are schematic diagrams for explaining each process, and FIG. 6E is a schematic diagram showing the manufactured arc tube 20a.

  The arc tube manufacturing method according to Embodiment 2 basically includes the same steps as the arc tube manufacturing method according to Embodiment 1, but the arc tube manufacturing method according to Embodiment 2 includes a heating and stretching step. Instead, a removal process is included. That is, as shown in FIG. 5, the arc tube manufacturing method according to the second embodiment includes the “arc tube base tube preparation step S20”, the “removal processing step S22”, and the “arc tube manufacturing step S24” in this order. . Hereinafter, these steps will be sequentially described.

A. Arc tube preparation process S20
Since the arc tube preparation step S20 is the same as that in the arc tube manufacturing method according to Embodiment 1, the description thereof is omitted (see FIG. 6A).

B. Removal processing step S22
Next, as shown in FIG. 6A, in the arc tube base tube 70a, a part of the surface of the location 72a corresponding to the constricted portion is removed according to the shape corresponding to the constricted portion 60a. When the removal processing step is completed, as shown in FIG. 6B, a portion that becomes the base of the constricted portion is formed. As the removal processing, for example, cutting with a drill or the like, grinding with a grinder, laser processing, electron beam processing, or the like can be performed. The tube portion 74a corresponds to the first sealing portion 40a of the arc tube 20a, and the tube portion 76 corresponds to the second sealing portion 50 of the arc tube 20a, but the tube portions 74a and 76 correspond to the respective sealing portions. It is configured to be somewhat longer than the stop.

C. Arc tube manufacturing process S24
As shown in FIGS. 6C and 6D, the arc tube manufacturing step S24 is the same as that of the arc tube manufacturing method according to the first embodiment, and a description thereof will be omitted.

  By performing the above steps, the arc tube 20a can be manufactured as shown in FIG.

  According to the arc tube manufacturing method according to Embodiment 2 described above, the location, depth, and shape include the removal processing step of removing a part of the surface of the location 72a corresponding to the constricted portion in the arc tube base tube 70a. Becomes the constricted portion 60a. In addition, since the region including the constricted portion 60a is heated by the shrink seal method, distortion and microcracks that may occur in the removing process are removed, and the strength of the arc tube 20a is not reduced due to these. .

[Embodiment 3]
FIG. 7 is a flowchart showing a method of manufacturing the arc tube according to the third embodiment.
FIG. 8 is a diagram for explaining the arc tube manufacturing method according to the third embodiment. FIG. 8A and FIG. 8B are schematic diagrams for explaining each process, and FIG. 8C is a schematic diagram showing the manufactured arc tube 20b.

  In the arc tube manufacturing method according to Embodiment 3, an arc tube having no constriction is prepared, and the constriction is formed by performing removal processing and heat treatment on the arc tube. That is, as shown in FIG. 7, the arc tube manufacturing method according to the third embodiment includes the “arc tube preparation step S30”, the “removal processing step S32”, and the “neck portion forming step S34” in this order. Hereinafter, these steps will be sequentially described.

A. Arc tube preparation process S30
First, an arc tube 80 having no constricted portion is prepared (see FIG. 8A). The arc tube 80 having no constricted portion is, for example, an arc tube that is generally sold. As the arc tube 80, various arc tubes capable of emitting light with high luminance can be employed. For example, a metal halide lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, or the like can be employed.

B. Removal processing step S32
Next, as shown in FIG. 8A, in the arc tube 80, a part of the surface of the place 82 corresponding to the constricted portion is removed according to the shape corresponding to the constricted portion 60b. As the removal processing, for example, cutting with a drill or the like, grinding with a grinder, laser processing, electron beam processing, or the like can be performed. The sealing portion 84 corresponds to the first sealing portion 40b of the arc tube 20b, and the sealing portion 86 corresponds to the second sealing portion 50 of the arc tube 20b.

C. Constriction part forming step S34
Further, as shown in FIG. 8B, the constricted portion 60b is formed by heat-treating the region including the portion removed in the removal processing step. For the heat treatment, for example, a hydrogen-oxygen burner or the like can be used.

  By performing the above steps, the arc tube 20b can be manufactured as shown in FIG.

  According to the arc tube manufacturing method according to Embodiment 3 described above, the constricted portion 60b is formed later on the arc tube 80 that is generally sold, and the arc tube 20b for use in the light source device of the present invention is obtained. It becomes possible. In addition, since it includes a step of heat-treating the region including the removed portion in the removal processing step, distortion and microcracks that may occur in the removal processing step are removed, resulting in a decrease in the intensity of the arc tube. Disappears.

[Embodiment 4]
FIG. 9 is a diagram for explaining the light source device 110c according to the fourth embodiment. FIG. 9A is a side view showing the light source device 110c, FIG. 9B is an enlarged view of the range A2 in FIG. 9A, and FIG. 9C is FIG. It is B2-B2 sectional drawing of b).
FIG. 9 is a schematic diagram, and the thickness of the second metal foil 54 is exaggerated for display.

  The arc tube 110c according to the fourth embodiment basically has the same configuration as the light source device 110 according to the first embodiment, but the configuration of the arc tube is different from that of the light source device 110 according to the first embodiment. That is, in the light source device 110c according to the fourth embodiment, the second sealing portion 50c further includes a constricted portion 62 as illustrated in FIG.

As shown in FIG. 9A and FIG. 9B, the second sealing portion 50c is closer to the second lead wire 56 than the portion where the second electrode 52 and the second metal foil 54 are connected. And the constriction part 62 extended along the circumferential direction of the 2nd sealing part 50c in the place which is the 2nd electrode 52 side rather than the location where the 2nd metal foil 54 and the 2nd lead wire 56 are connected. Have.
As shown in FIG. 9C, the constricted portion 62 is cut along a virtual plane perpendicular to the axis of the second sealing portion 50c (same as the illumination optical axis 100ax), for example, a plane including B2-B2. The cross section of is substantially circular.

  As described above, the light source device 110c according to the fourth embodiment is different from the light source device 110 according to the first embodiment in the configuration of the arc tube, but in the arc tube 20c, the first sealing portion 40 is the first sealing portion 40. The first lead wire 46 side from the place where the electrode 42 and the first metal foil 44 are connected, and the first electrode 42 side than the place where the first metal foil 44 and the first lead wire 46 are connected. Since the constricted portion 60 extends along the circumferential direction of the first sealing portion 40 at a place where the first metal foil 44 and the first lead are provided, as in the case of the light source device 110 according to the first embodiment. It becomes a light source device which can suppress that the location where line 46 is connected becomes high temperature.

  Further, according to the light source device 110c according to the fourth embodiment, the second sealing portion 50c is closer to the second lead wire 56 than the portion where the second electrode 52 and the second metal foil 54 are connected, and To have a constricted portion 62 extending along the circumferential direction of the second sealing portion 50c at a location that is closer to the second electrode 52 than a location where the second metal foil 54 and the second lead wire 56 are connected. The constricted part 62 restricts heat conduction from the tube part, which is the main heat source, and it is possible to prevent the portion where the second metal foil 54 and the second lead wire 56 are connected from becoming hot. It becomes.

  The light source device 110c according to the fourth embodiment has the same configuration as that of the light source device 110 according to the first embodiment except for the configuration of the arc tube, and thus the effect of the light source device 110 according to the first embodiment is achieved. Of which, it has the relevant effect.

  The constricted portion 62 can be formed by applying any one of the method described in the first embodiment, the method described in the second embodiment, or the method described in the third embodiment.

[Embodiment 5]
FIG. 10 is a side view schematically showing the light source device 110d according to the fifth embodiment.

  The arc tube 110d according to the fifth embodiment basically has the same configuration as the light source device 110 according to the first embodiment, but the configuration of the arc tube is different from that of the light source device 110 according to the first embodiment. That is, in the light source device 110d according to the fifth embodiment, the first sealing portion 40d has two constricted portions 64 and 66 as shown in FIG. Although the detailed illustration is omitted, the two constricted portions 64 and 66 have the same configuration as the constricted portion 60 in the arc tube 110 according to the first embodiment.

  As described above, the light source device 110d according to the fifth embodiment is different from the light source device 110 according to the first embodiment in the configuration of the arc tube, but in the arc tube 20d, the first sealing portion 40d is the first electrode. 42 on the first lead wire 46 side than the location where the first metal foil 44 and the first metal foil 44 are connected, and on the first electrode 42 side than the location where the first metal foil 44 and the first lead wire 46 are connected. Since the constricted portions 64 and 66 extending along the circumferential direction of the first sealing portion 40d are provided at a certain place, the first metal foil 44 and the first metal foil 44 are connected to the first metal foil 44 as in the case of the light source device 110 according to the first embodiment. This is a light source device capable of suppressing the location where the lead wire 46 is connected from becoming high temperature.

  In addition, according to the light source device 110d according to the fifth embodiment, the first sealing portion 40d has two or more constricted portions, so that heat conduction from the tube portion is more strongly limited, and the first metal foil 44 and It is possible to effectively suppress the location where the first lead wire 46 is connected from being hot.

  The light source device 110d according to the fifth embodiment has the same configuration as that of the light source device 110 according to the first embodiment except for the configuration of the arc tube, and thus the effect of the light source device 110 according to the first embodiment is achieved. Of which, it has the relevant effect.

  The constricted portions 64 and 66 can be formed by applying any one of the method described in the first embodiment, the method described in the second embodiment, or the method described in the third embodiment.

[Embodiment 6]
FIG. 11 is a diagram for explaining the light source device 110e according to the sixth embodiment. 11A is a side view showing the light source device 110e, FIG. 11B is a top view showing the light source device 110e, and FIG. 11C is a cross-sectional view along B3-B3 in FIG. 11A. is there.
Note that FIG. 11 is a schematic diagram, in which the thicknesses of the first metal foil 44 and the second metal foil 54 are exaggerated.

The light source device 110e according to the sixth embodiment basically has the same configuration as the light source device 110 according to the first embodiment, but the configuration of the arc tube is different from that of the light source device 110 according to the first embodiment. That is, in the light source device 110e according to the sixth embodiment, as shown in FIG. 11C, the constricted portion 60e is a virtual plane perpendicular to the axis of the first sealing portion 40e (same as the illumination optical axis 100ax). For example, in a cross section when cut along a plane including B3-B3, the length L1 in the direction perpendicular to the foil surface of the first metal foil 44 in the cross section is shorter than the length L2 in the parallel direction.
A projector 1000e (not shown) according to the sixth embodiment basically has the same configuration as the projector 1000 according to the first embodiment, but the arrangement of the light source devices is the projector 1000 according to the first embodiment. Is different. That is, in the projector 1000e according to the sixth embodiment, the light source device 110e is arranged so that the foil surfaces of the pair of metal foils are substantially parallel to the direction of gravity (y-axis direction) in the use state. The

  As described above, the light source device 110e according to the sixth embodiment is different from the light source device 110 according to the first embodiment in the configuration of the arc tube, but in the arc tube 20e, the first sealing portion 40e includes the first electrode. 42 on the first lead wire 46 side than the location where the first metal foil 44 and the first metal foil 44 are connected, and on the first electrode 42 side than the location where the first metal foil 44 and the first lead wire 46 are connected. Since there is a constricted portion 60e extending along the circumferential direction of the first sealing portion 40e at a certain location, the first metal foil 44 and the first lead wire are provided as in the case of the light source device 110 according to the first embodiment. 46 is a light source device capable of suppressing the temperature of the portion connected to 46 from becoming high.

  Further, according to the light source device 110e according to the sixth embodiment, in a cross section when cut by a virtual plane perpendicular to the axis of the pair of sealing portions, the cross section is perpendicular to the foil surface of the first metal foil 44 in the cross section. Since the length L1 is shorter than the length L2 in the parallel direction, the arc tube is particularly durable against an impact from a direction substantially parallel to the foil surface of the pair of metal foils (y-axis direction). Is possible.

  The light source device 110e according to the sixth embodiment has the same configuration as that of the light source device 110 according to the first embodiment except for the configuration of the arc tube. Therefore, the light source device 110 according to the first embodiment has the effect. Of which, it has the relevant effect.

  In addition, the projector 1000e according to the sixth embodiment includes the light source device 110e according to the sixth embodiment, and the light source device 110e has a pair of metal foils whose surface is in a gravitational direction (y-axis direction) when in use. Therefore, it becomes a highly reliable projector provided with an excellent light source device. In use, the light source device 110e is disposed so that the foil surfaces of the pair of metal foils are substantially parallel to the direction of gravity (y-axis direction). Since the parallel direction follows the direction of gravity, and the arc tube 20e of the light source device 110e according to the sixth embodiment is particularly durable against an impact from the direction, it is easy to generate gravity in actual use. The projector is highly durable against impact from the direction.

  The constricted portion 60e can be formed by applying either the method described in the second embodiment or the method described in the third embodiment.

  The light source device, projector, and arc tube manufacturing method of the present invention have been described based on the above embodiments, but the present invention is not limited to the above embodiments. The present invention can be carried out in various modes without departing from the gist thereof, and for example, the following modifications are possible.

(1) In Embodiment 5 described above, the first sealing portion 40d has two constricted portions, but the present invention is not limited to this. For example, the first sealing portion may have three or more constricted portions. The second sealing portion may have two or more constricted portions.

(2) In the sixth embodiment, the first sealing portion 40e has one constricted portion, but the present invention is not limited to this. For example, the first sealing portion may have two or more constricted portions. The second sealing portion may have one or more constricted portions.

(3) In the above embodiments, the light source device including the ellipsoidal reflector 10 is used, but the present invention is not limited to this. For example, a light source device including a paraboloid reflector may be used. In the light source device in this case, the concave lens may not be provided.

(4) In each of the above embodiments, a transmissive projector is used, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that a light modulation device as a light modulation means such as a transmission type liquid crystal display device transmits light, and “reflection type” This means that the light modulation device as the light modulation means, such as a reflective liquid crystal display device, is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(5) In each of the above embodiments, the liquid crystal devices 400R, 400G, and 400B are used as the light modulation device of the projector, but the present invention is not limited to this. In general, the light modulation device only needs to modulate incident light according to image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(6) Although the light source device having the ellipsoidal reflector 10 and the arc tube is used in each of the above embodiments, the present invention is not limited to this. For example, you may use the light source device which further has a submirror which reflects light toward a reflector.

(7) In each of the above embodiments, the projector using the liquid crystal devices 400R, 400G, and 400B has been described as an example, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, or four or more liquid crystal devices.

(8) In the projectors according to the above embodiments, the lens integrator optical system is used as the light uniformizing optical system, but the present invention is not limited to this. For example, a rod integrator optical system can also be preferably used.

(9) The present invention is applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

(10) In each of the above embodiments, the example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disk device).

DESCRIPTION OF SYMBOLS 10 ... Ellipsoidal reflector, 12 ... Opening part, 14 ... Reflecting surface, 20, 20a, 20b, 20c, 20d, 20e, 80 ... Arc tube, 30 ... Tube part, 40, 40a, 40b, 40d ... First seal Stop part 42 ... 1st electrode 44 ... 1st metal foil, 46 ... 1st lead wire, 50, 50c ... 2nd sealing part, 52 ... 2nd electrode, 54 ... 2nd metal foil, 56 ... 2nd Lead wire, 60, 60a, 60b, 60e, 62, 64, 66 ... Constriction, 70, 70a ... Arc tube tube, 72, 72a, 82 ... Location corresponding to the constriction, 74, 74a, 76 ... Tube , 84, 86 ... sealing portion, 90 ... concave lens, 100 ... illumination device, 100ax ... illumination optical axis, 110, 110c, 110d, 110e ... light source device, 120 ... first lens array, 122 ... first small lens, 130 ... second lens array, 132 ... second Small lens, 140 ... polarization conversion device, 150 ... superposition lens, 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250 ... reflection mirror, 260, 270 ... relay lens, 300R, 300G, 300B ... Condensing lens, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection optical system, 1000 ... Projector, C ... Cement, SCR ... Screen

Claims (10)

A tube part, a pair of electrodes incorporated in the tube part, a pair of metal foils electrically connected to the pair of electrodes, and a pair of seals for sealing the pair of metal foils, respectively And a luminous tube having a pair of lead wires electrically connected to the pair of metal foils,
A light source device comprising a reflector that reflects light emitted from the arc tube to an illuminated area,
Of the pair of electrodes, the electrode on the illuminated region side is the first electrode,
The electrode for the first electrode is a second electrode,
Of the pair of metal foils, the metal foil connected to the first electrode is a first metal foil,
The metal foil for the first metal foil is the second metal foil,
Of the pair of sealing portions, a sealing portion that seals the first metal foil is a first sealing portion,
The sealing part for the first sealing part is the second sealing part,
Of the pair of lead wires, a lead wire connected to the first metal foil is a first lead wire,
When the lead wire for the first lead wire is the second lead wire,
The first sealing portion is closer to the first lead wire than a portion where the first electrode and the first metal foil are connected, and the first metal foil and the first lead wire are connected to each other. A light source device having a constricted portion extending along a circumferential direction of the first sealing portion at a location closer to the first electrode than a portion to be provided. The light source device according to claim 1,
The second sealing portion is closer to the second lead wire than a portion where the second electrode and the second metal foil are connected, and the second metal foil and the second lead wire are connected to each other. A light source device having a constricted portion extending along a circumferential direction of the second sealing portion at a location closer to the second electrode than a location where the second sealing portion is provided. The light source device according to claim 1 or 2,
Any one of the first sealing portion and the second sealing portion has two or more constricted portions. In the light source device in any one of Claims 1-3,
The constricted portion has a substantially circular cross section when the constricted portion is cut along a virtual plane perpendicular to the axis of the pair of sealing portions. In the light source device in any one of Claims 1-3,
The constricted portion has a length in a direction perpendicular to the foil surface of the pair of metal foils in the cross section when the constricted portion is cut in a virtual plane perpendicular to the axis of the pair of sealing portions. A light source device characterized by being shorter than a length in a parallel direction. A lighting device comprising the light source device according to any one of claims 1 to 5,
A light modulation device that modulates illumination light from the illumination device according to image information;
A projector comprising: a projection optical system that projects modulated light from the light modulation device as a projection image. An illumination device comprising the light source device according to claim 5;
A light modulation device that modulates illumination light from the illumination device according to image information;
A projector including a projection optical system that projects the modulated light from the light modulation device as a projection image,
The projector is characterized in that the light source device is arranged such that, in use, the foil surfaces of the pair of metal foils are substantially parallel to the direction of gravity. A method of manufacturing an arc tube for use in the light source device according to claim 1,
An arc tube base tube preparing step for preparing an arc tube base tube in which the tube portion is formed,
A heating and stretching step of locally heating and stretching a place corresponding to the constricted portion of the arc tube base tube,
An arc tube manufacturing method comprising the arc tube manufacturing step of manufacturing the arc tube by a shrink seal method using the arc tube base tube in this order. A method of manufacturing an arc tube for use in the light source device according to claim 1,
An arc tube base tube preparing step for preparing an arc tube base tube in which the tube portion is formed,
A removal processing step of removing a part of the surface of the place corresponding to the constricted part in the arc tube element tube,
An arc tube manufacturing method comprising the arc tube manufacturing step of manufacturing the arc tube by a shrink seal method using the arc tube base tube in this order. A method of manufacturing an arc tube for use in the light source device according to claim 1,
An arc tube preparation process for preparing an arc tube having no constriction,
A removal processing step of removing a part of the surface of the place corresponding to the constricted portion in the arc tube;
A method of manufacturing an arc tube comprising: a constricted portion forming step of forming a constricted portion by heat-treating a region including a portion removed in the removing process step in this order.

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