CN1788179A - Illuminator and projector with same - Google Patents

Abstract

An illuminator comprises an arc tube (10) composed of a radiating section (11) in which light is radiated between a pair of electrodes (12) and sealed sections (13) disposed on both sides of the radiating section (11); a first reflecting mirror (20) holding the arc tube (10), reflecting light radiated from the arc tube (10), and directing the light forward; and a transparent plate (25) disposed at the front end of the first reflecting mirror (20). A second reflecting mirror (30) for reflecting the light from the radiating section (11) toward the first reflecting mirror (20) is fixed to at least one of the sealed sections (13) and the transparent plate (25) in such a way that the second reflecting mirror (30) encloses the front part of the radiating section (11). The transparent plate (25) is in contact with or secured to the second reflecting mirror (30), and at least one of the transparent plate (25) and the second reflecting mirror (30) is in contact with or secured to the sealed section (13).

Description

Lighting device and projector equipped with same

technical field

The present invention relates to a lighting device having an arc tube and a reflector for reflecting light emitted from the arc tube, and a projector including the illuminating device.

Background technique

As an illuminating device, an illuminating device comprising an arc tube and a reflector for directing light emitted from the arc tube in a predetermined direction is widely used. In such a lighting device, in order to effectively utilize the light that is emitted from the luminous tube but becomes stray light and cannot be used, as disclosed in JP-A-8-31382 (page 2, FIG. 1 ), Therefore, an auxiliary second reflector is provided at a position facing the above reflector so as to sandwich the luminous tube.

However, when the auxiliary second reflecting mirror is attached to the arc tube so as to surround the periphery of the light emitting part of the arc tube, the second reflecting mirror functions to reduce the heat dissipation of the arc tube. Therefore, there is a problem that the temperature of the arc tube becomes a non-uniform temperature distribution and the temperature rises locally and greatly, which leads to consumption of electrodes, cloudiness and expansion of the arc tube, and shortens the life of the arc tube.

Contents of the invention

The present invention was made in view of the above-mentioned problems, and an object thereof is to provide a lighting device including: a luminous tube, a first reflecting mirror as a main reflecting mirror for light emitted from the luminous tube, and a lens arranged at the front end of the first reflecting mirror. A light panel including a light emitting tube capable of preventing a reduction in the life and reliability of the second reflecting mirror even when the second reflecting mirror as an auxiliary reflecting mirror is installed so as to surround the periphery of the light emitting portion of the light emitting tube. . Furthermore, it also aims to provide a projector including the lighting device.

The lighting device of the present invention includes: a light emitting tube having a light emitting part emitting light between a pair of electrodes and sealing parts positioned on both sides of the light emitting part, holding the light emitting tube and reflecting the light emitted from the light emitting tube to make it The first reflecting mirror facing forward, and the light-transmitting plate arranged at the front end of the first reflecting mirror are characterized in that: the front part surrounding the light emitting part reflects light from the light emitting part toward the first reflecting mirror side. The second reflection mirror for the light is at least adhesively fixed on at least one of the above-mentioned sealing part and the above-mentioned light-transmitting plate; the above-mentioned light-transmitting plate and the above-mentioned second reflection mirror are contacted or bonded and fixed, and the above-mentioned light-transmitting plate and the above-mentioned At least one of the second reflectors is fixed to the sealing part by contacting or bonding. Thus, because most of the light from the luminous tube that usually becomes stray light is returned to the first reflective mirror through the second reflection mirror, it can be used, and the heat of the luminous tube is directed toward the light-transmitting plate or through the above-mentioned first reflection mirror. The second reflecting mirror conducts heat to the light-transmitting plate to dissipate heat, so even if heat is increased due to the arrangement of the second reflecting mirror, the temperature rise of the luminous tube can be prevented or reduced.

Furthermore, another illuminating device of the present invention includes: a light emitting tube having a light emitting portion emitting light between a pair of electrodes and sealing portions positioned on both sides of the light emitting portion, holding the light emitting tube and reflecting light emitted from the light emitting tube. A first reflection mirror for directing light forward, and a light-transmitting plate arranged at a front end portion of the first reflection mirror, are characterized in that the front portion surrounding the light-emitting portion is reflected toward the first reflection mirror. The second reflection mirror for the light from the light-emitting part is adhesively fixed on the above-mentioned light-transmitting plate; a gap is provided between the above-mentioned light-transmitting plate, the above-mentioned second reflection mirror, and the above-mentioned light-emitting tube. Thus, since most of the light from the luminous tube that usually becomes stray light is returned to the first reflective mirror through the second reflector and made available, and the luminous tube is cooled by the air passing through the above-mentioned gap, even due to The setting of the second reflecting mirror increases heat generation, and can also prevent or reduce the temperature rise of the luminous tube.

In addition, the above-mentioned adhesive fixation may be adhesive fixation by an adhesive.

As a result, the second reflection mirror can be firmly fixed by the adhesive with good adhesiveness, and the heat dissipation of the heat conduction from the arc tube to the light-transmitting plate is also improved.

Furthermore, another illuminating device of the present invention includes: a light emitting tube having a light emitting portion emitting light between a pair of electrodes and sealing portions positioned on both sides of the light emitting portion, holding the light emitting tube and reflecting light emitted from the light emitting tube. A first reflection mirror for directing light toward the front, and a light-transmitting plate arranged at the front end of the first reflection mirror, are characterized in that they surround the front side portion of the light emitting part and reflect light from the first reflection mirror to the side of the first reflection mirror. The substrate of the second reflection mirror for the light of the light-emitting part is integrally formed with the light-transmitting plate.

Thus, since the substrate of the second reflector and the light-transmitting plate are integrally formed, the second reflector can be fixed by disposing the light-transmitting plate on the first reflector. Therefore, together with the second reflector, the second reflector The heat of the second reflector is conducted to the light-transmitting plate to dissipate heat, so even if heat is increased due to the setting of the second reflector, the temperature rise of the luminous tube can be prevented or reduced.

In addition, another illuminating device of the present invention includes: a light emitting tube having a light emitting portion emitting light between a pair of electrodes and sealing portions positioned on both sides of the light emitting portion, holding the light emitting tube and reflecting light emitted from the light emitting portion. A first reflection mirror for directing light forward, and a light-transmitting plate arranged at a front end portion of the first reflection mirror, are characterized in that: a front side portion surrounding the light emitting portion and reflecting toward the first reflection mirror side is provided. A second reflection mirror for light from the light emitting unit; the second reflection mirror is arranged to face the outer peripheral surface of the light emitting unit with a gap therebetween, and is wound around the outer periphery of the sealing unit by having a gap with respect to the outer peripheral surface The upper spring is pressed and fixed near the above-mentioned light-emitting part. Thus, since most of the light from the luminous tube that usually becomes stray light is returned to the first reflective mirror through the second reflector and made available, and the luminous tube is cooled by the air passing through the above-mentioned gap, even due to The increased heat generated by the existence of the second reflecting mirror can also prevent or reduce the temperature rise of the luminous tube.

Further, it is preferable that the spring is constituted by a conductive coil, and one end of the conductive coil is connected to a lead wire protruding from the sealing portion opposite to the side where the spring is arranged. Thereby, the spring can be used for the dielectric breakdown inside the arc tube when the arc tube starts to emit light, and the lighting performance of the arc tube can be improved.

In addition, it is preferable that the light-transmitting plate is bonded and fixed to the sealing portion with an adhesive. According to this, since the heat dissipation caused by the heat conduction from the arc tube to the light-transmitting plate is also increased, the temperature rise of the arc tube can be effectively prevented.

In addition, it is preferable that the above-mentioned light-transmitting plate is made of any one of a light-transmitting material with a low thermal expansion coefficient or a light-transmitting material with a high thermal conductivity. Furthermore, it is preferable that the substrate of the second reflection mirror is made of either a material with a low thermal expansion coefficient or a material with a high thermal conductivity. Because the light-transmitting plate or/and the second reflecting mirror are made of materials with low thermal expansion rate or good thermal conductivity, it is used as a light-transmitting plate disposed at the front end of the first reflecting mirror, or as a light-transmitting plate facing the first reflecting mirror. The substrate of the second reflecting mirror is very preferable because it can prevent deformation, deterioration, etc. due to heat.

Preferably, the above-mentioned light-transmitting plate and the above-mentioned sealing portion, the above-mentioned second reflection mirror and the above-mentioned sealing portion, or the above-mentioned light-transmitting plate and the above-mentioned second reflection mirror are bonded and fixed by aluminum nitride or silicon dioxide and aluminum oxide. Implemented with adhesives. Since these are inorganic adhesives, they have good heat resistance and light resistance, and aluminum nitride-based adhesives have good thermal conductivity, so heat dissipation from the arc tube to the light-transmitting plate can be promoted.

Furthermore, it is preferable that a heat dissipation fin is provided on the outer peripheral portion of the above-mentioned light-transmitting plate. In this way, the heat dissipation area of the light-transmitting plate is increased to promote the heat dissipation of the luminous tube.

Furthermore, it is preferable that one end of the sealing portion protrudes toward an open region side through the light-transmitting plate from a region surrounded by the first reflection mirror and the light-transmitting plate. In this way, because one end of the sealing part is in the open side space, the light-emitting part as the heat source and the protruding sealing part are separated by the above-mentioned light-transmitting plate, so that one end of the sealing part is not exposed to the high-temperature air around the light-emitting part as the heat source. influence, improve its cooling performance.

The projector of the present invention comprises: an illuminating device, and a light modulation device for modulating the incident light according to supplied image information by incident light from the illuminating device. lighting fixtures as described. Thus, a projector with high brightness and long life is obtained.

Description of drawings

FIG. 1 is a configuration diagram of a lighting device in Example 1 of Embodiment 1 of the present invention.

Fig. 2 is an explanatory diagram of the operation of the lighting device of Fig. 1 .

3 is a configuration diagram of an illuminating device in Example 2 of Embodiment 1 of the present invention.

4 is a configuration diagram of a lighting device in Example 3 of Embodiment 1 of the present invention.

5 is a configuration diagram of an illumination device in Example 4 of Embodiment 1 of the present invention.

6 is a configuration diagram of a lighting device in Example 1 of Embodiment 2 of the present invention.

7 is a configuration diagram of a lighting device in Example 2 of Embodiment 2 of the present invention.

8 is a configuration diagram of a lighting device in Example 3 of Embodiment 2 of the present invention.

Fig. 9 is a configuration diagram of a lighting device in Embodiment 3 of the present invention.

FIG. 10 is a configuration diagram of a projector including the lighting device in the above embodiment.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, the same code|symbol represents the same member or an equivalent member.

Embodiment 1

FIG. 1 is a configuration diagram of a lighting device 100 in Example 1 of Embodiment 1 of the present invention, and FIG. 2 is an explanatory diagram of the operation of the device 100 in FIG. 1 .

The lighting device 100 includes a light emitting tube 10 , a first reflector 20 as a main reflector of the lighting device 100 , a light-transmitting plate 25 , and a second reflector 30 as an auxiliary reflector of the lighting device 100 . The luminous tube 10 is made of quartz glass or the like, and has a central luminous part 11 in which a pair of electrodes 12, 12 made of tungsten, mercury, a rare gas, and a small amount of halogen are sealed inside, and the luminous part 11 is sandwiched and positioned at the front. The sealing portion 13a on the side and the sealing portion 13b on the rear side are constituted. Metal foils 14a, 14b made of molybdenum respectively connected to a pair of electrodes 12a, 12b are sealed in each sealing portion 13a, 13b, and lead wires 15a, 15b connected to the outside are respectively provided on each metal foil 14a, 14b. In addition, the connecting objects of the lead wires 15a and 15b may be the same as the conventional configuration, for example, they may be connected to connection terminals connected to the outside provided on a lighting device fixture not shown in the figure.

In addition, on the outer peripheral surface of the light emitting part 11, if an anti-reflection coating of a multi-layer film including a tantalum oxide film, a hafnium oxide film, a titanium oxide film, etc. is implemented in advance, the effect caused by the reflection of light passing through the place can be reduced. caused light loss.

The first reflecting mirror 20 is a reflective element arranged on the rear side of the light-emitting part 11 in the longitudinal direction of the light-emitting tube 10 in the lighting device 100 including the light-emitting tube 10 . The through hole 21. The arc tube 10 is inserted into the through hole 21 of the first reflector 20 so that the axis of the arc tube 10 coincides with the axis of the first reflector 20, and is bonded and fixed there by an inorganic adhesive 22 such as cement. The axis of the arc tube 10 is the central axis in the longitudinal direction of the arc tube 10, and substantially coincides with the line connecting the electrode 12a and the electrode 12b. Also, the axis of the first reflector 20 is the axis of rotation constituting the rotation curve of the reflective surface of the first reflector 20 , and substantially coincides with the central axis of the light beam emitted from the lighting device 100 . In addition, the center of the light-emitting part 11 of the arc tube 10 (the center between the electrodes 12, 12) coincides with its first focal point (F1) or is located at Its vicinity coincides with its focal point F or is located in its vicinity when the reflection surface of the first reflecting mirror 20 is a paraboloid of revolution. That is, the center of the light emitting unit 11 is disposed near the focal point F1 or F of the first reflector 20 , or at a position substantially coincident with the focal point F1 or F. Here, assuming that the reflection surface of the first reflection mirror 20 is a spheroid shape, F1 and F2 represent the first focal point and the second focus of the rotation ellipse curve of the reflection surface of the first reflection mirror 20, and f1 and f2 represent the first and second focal points from the first reflection surface. The distance from the vertex of the rotation curve of the reflection surface of the reflection mirror 20 to the first focal point F1 and the second focal point F2. In addition, the reflection surface of the first reflection mirror 20 may also have other shapes such as a paraboloid of revolution.

The light-transmitting plate 25 is a member arranged at the front end (opening side) of the first reflecting mirror 20, and basically prevents scattering when the arc tube 10 is broken. around the front end. However, it is also possible to attach the first reflecting mirror 20 with a gap around the front end portion thereof. The light-transmitting plate 25 is made of quartz, pyrex (registered trademark) glass with a low thermal expansion rate, or sapphire crystal, YAG (yttrium aluminum garnet), or fluorite with a high thermal conductivity. Furthermore, a through-hole 25 a is provided at the center portion of the light-transmitting plate 25 . One end of the sealing portion 13 a of the arc tube 10 penetrates the light-transmitting plate 25 through the through-hole 25 a and protrudes outside the area surrounded by the first reflector 20 and the light-transmitting plate 25 .

The second reflecting mirror 30 is a reflective element disposed on the front side of the light emitting part 11 in the lighting device 100 including the light emitting tube 10, and its reflecting surface 30a surrounds approximately half of the front side of the light emitting part 11, and makes the light emitted from the The incident light emitted from the center of the portion 11 and entering the second reflector 30 is arranged so as to coincide with the normal line of the reflective surface 30 a of the second reflector 30 . The structure of the light emitting part 11 (the position between the electrodes 12, 12, the shape of each part of the light emitting part 11, etc.) is different for each light emitting tube 10 due to manufacturing variations, etc., so the reflective surface of the second reflector 30 is preferably The shape of 30a is determined for each light emitting tube 10 in accordance with the relationship with the light emitting unit 11 .

In addition, the fixing of the second reflecting mirror 30 to the sealing portion 13a will be described later.

Furthermore, since the second reflection mirror 30 is exposed to a high temperature of about 900 to 1000°C, it must be made of a material excellent in heat resistance. For example, if the second reflection mirror 30 is made of quartz, pyrex (registered trademark) glass with low thermal expansion rate, or sapphire, crystal, YAG (Y ₃ Al ₅ O ₁₂ , yttrium glass) with high thermal conductivity aluminum garnet), fluorite, etc., can prevent deformation and deterioration caused by heat, and can also prevent the temperature rise of the second reflector 30 because of the high transmittance of ultraviolet rays and infrared rays.

If the reflective surface 32 of the second reflector 30 can only reflect visible light that can be used for illumination and pass ultraviolet and infrared rays that are unnecessary for illumination, the heat generated on the second reflector 30 can be reduced. Therefore, here, a dielectric multilayer film that reflects only visible light and passes ultraviolet rays and infrared rays is laminated on the reflection surface 32 of the second reflection mirror 30 . The dielectric multilayer film also needs to be heat resistant, and can be composed, for example, of alternate laminations of tantalum compounds and SiO ₂ , or alternate laminations of hafnium compounds and SiO ₂ .

Also, the outer surface of the second reflection mirror 30 is preferably equipped to transmit the incident light (infrared rays, ultraviolet rays, visible light leaked from the reflection surface 32 side, etc.) The reflection surface 32 reflects and incident light is diffusely reflected and shaped so that the second reflection mirror 30 does not absorb light as much as possible.

And, as shown in FIG. 1 , the first reflection of the cone shown by the boundary lights L1 and L2 emitted from the light emitting unit 11 to the side of the first reflector 20 , that is, the rear side of the lighting device 100 The diameter D1 of the reflective surface of the mirror 20 is larger than the diameter d1 of the outer surface of the second reflecting mirror 30, and the diameter d1 of the outer surface of the second reflecting mirror 30 becomes to enter the boundary light L1, The diameter d1 of the outer surface of the second reflecting mirror 30 is set such that the inner side of the cone formed by the light reflected by the first reflecting mirror 20 of L2 is large. In this way, among the light emitted from the light emitting unit 11 to the rear side of the lighting device 100 , the light within the usable range can travel without being blocked by the second reflector 30 after being reflected by the first reflector 20 .

In addition, the so-called available limit light L1, L2 refers to the light emitted from the light emitting unit 11 to the rear side of the lighting device 100, which corresponds to the inner boundary of the range that can be actually used as illumination light energy. The situation determined by the structure of the tube 10, and the situation determined by the structure of the first mirror 20. The so-called usable limit light determined by the structure of the luminous tube 10 is emitted from the light-emitting portion 11 to the first reflector 20a side, that is, the rear side, and is not affected by the sealing portion 13b, etc., and is not blocked as effective light. Among the light, the effective light is the boundary between the light that is blocked by the sealing portion 13b and the like. Moreover, the so-called usable boundary light determined by the structure of the first reflector 20 is emitted from the light emitting part 11 to the first reflector 20 side, that is, the rear side of the lighting device 100 and is not affected by the sealing part 13b or the like. Among the blocked light emitted as effective light, those that cannot be reflected by the reflecting surface of the first reflecting mirror 20 due to the presence of the through hole 21 of the first reflecting mirror 20, etc., cannot be used as effective light. The effective light that illuminates the boundary between lights exploited by the light. In addition, in the case where the limit light that can be used is the limit light determined by the structure of the arc tube 10, according to this embodiment, almost all of the light emitted from the light emitting unit 11 to the rear side of the lighting device 100 can be used. .

When the diameter d1 of the outer surface of the second reflection mirror 30 becomes larger, the light utilization efficiency decreases because light traveling forward after being reflected by the first reflection mirror 20 is blocked more. Therefore, in order to avoid a decrease in light utilization efficiency, the diameter d1 of the outer surface of the second reflector 30 should be reduced as much as possible.

The lighting device 100 obtained by the above configuration functions as follows. That is, as shown in FIG. in front of. In addition, the lights L3 and L4 emitted from the front side of the center of the light emitting unit 11 are reflected by the second reflector 30 and returned to the first reflector 20 , and then reflected by the first reflector 20 and head toward the lighting device 100 . in front of. Thereby, almost all of the emitted light from the light emitting unit 11 can be utilized.

By employing such a second reflector 30 as described above, the light beam radiated from the light emitting unit 11 to the side (front side) opposite to the first reflector 20 can be reflected by the second reflector 30 to the rear side and enter the second reflector 30. Therefore, even if the reflecting surface of the first reflecting mirror 20 is small, almost all of the light beam emitted from the light emitting unit 11 can be focused to a certain position and emitted, and the light of the first reflecting mirror 20 can be Axial dimension and opening diameter become smaller. That is, the lighting device 100 and the projector 1000 can be downsized, and the layout for assembling the lighting device 100 into the projector 1000 is also facilitated.

And, by providing the second reflecting mirror 30, even if the second focal point F2 is brought close to the first focal point F1 of the first reflecting mirror 20 in order to reduce the focus spot diameter at the second focal point F2, it is also possible to make the light emitted from the light emitting unit 11 Almost all of the light can be used by being focused to the second focal point by the first reflector 20 and the second reflector 30, which can greatly improve the utilization efficiency of light.

Next, the fixing of the second mirror 30 and the sealing portion 13b will be described.

The second reflector 30 has a through hole 30b for fixing the arc tube 10 at the center of the reflective surface 30a. The second reflection mirror 30 is adhered and fixed to the sealing portion 13b of the arc tube 10 inserted into the through opening 30b with an adhesive 31 in a state where the axis of the arc tube 10 is aligned with the axis of the second reflector 30. . Furthermore, the second reflecting mirror 30 has a surface 30 c facing the light-transmitting plate 25 . The surface 30c of the second reflection mirror 30 is in contact with the light-transmitting plate 25 . In addition, it is preferable that the surface 30c of the second reflecting mirror 30 and the light-transmitting plate 25 are bonded together with an adhesive.

With the configuration of Embodiment 1 as above, since the second reflection mirror 30 is bonded and fixed to the sealing portion 13b of the arc tube 10 with the adhesive 31, the second reflection mirror 30 is also in a state of being in contact with the light-transmitting plate 25. Therefore, the heat generated by the light-emitting part 11 is transmitted from the sealing part 13b of the light-emitting tube 10 to the light-transmitting plate 25 through the adhesive 31 and the second reflector 30 . Moreover, because the second reflection mirror 30 and the light-transmitting plate 25 are not only in a contact state, if the second reflection mirror 30 and the light-transmitting plate 25 are reliably contacted by the adhesive agent in a bonded and fixed state, heat is easy to be emitted from the light. Since the tube 10 is conducted to the second reflector, the heat dissipation of the arc tube 10 is further improved.

Thereby, because the heat of the arc tube 10 is thermally conducted to the light-transmitting plate 25 through the adhesive 31 and the second reflector 30 to dissipate heat, although the second reflector 30 is arranged on the arc tube 10 and hinders the light-emitting part 11 The heat dissipation can also reduce or prevent the temperature rise of the luminous tube 10.

As described above, the lighting device 100 according to Embodiment 1 dissipates heat generated in the arc tube 10 to the light-transmitting plate 25 by heat conduction, and prevents the temperature rise of the arc tube 10 due to the installation of the first reflector 20 .

Embodiment 2

FIG. 3 is a configuration diagram of a lighting device 100A in Embodiment 2. FIG. The configuration of this lighting device 100A is basically the same as that of the lighting device 100 according to Embodiment 1 shown in FIGS. 1 and 2 , and differs from the lighting device 100 according to Embodiment 1 in the following points.

Both the through-hole 25a of the light-transmitting plate 25 and the through-hole 30b of the second reflection mirror 30 are bonded to the sealing portion 13a of the arc tube 10 with an adhesive 31 to be fixed.

According to the configuration of the second embodiment, in addition to the above-mentioned effects of the first embodiment, the heat from the arc tube 10 is directly transmitted to the light-transmitting plate 25 through the adhesive 31 to dissipate heat. Therefore, since the area for transferring heat from the arc tube 10 is larger than that of Embodiment 1, the temperature rise of the arc tube 10 can be further reduced or prevented.

Embodiment 3

FIG. 4 is a configuration diagram of a lighting device 100B in Embodiment 3. As shown in FIG. The configuration of this illuminating device 100B is basically the same as that of the illuminating device 100 of Embodiment 1 shown in FIGS. 1 and 2 , and differs from the illuminating device 100 of Embodiment 1 in the following points.

The surface 30c of the second reflecting mirror 30 is bonded and fixed to the light-transmitting plate 25 with an adhesive 31 to fix the second reflecting mirror 30 and the light-transmitting plate 25, and the through-hole 25a of the light-transmitting plate 25 is bonded with an adhesive 31. The light-transmitting plate 25 and the arc tube 10 are fixed by fixing to the sealing portion 13 a of the arc tube 10 . Wherein, the second reflector 30 and the light emitting tube 10 are in a non-contact state.

According to the third embodiment, heat from the arc tube 10 is dissipated by heat conduction to the light-transmitting plate 25 through the adhesive 31 . Then, the heat transferred from the light emitting unit 11 to the second reflection mirror 30 by convective heat transfer or radiation heat transfer is transferred from the surface 30 c of the second reflection mirror 30 to the light-transmitting plate 25 through the adhesive 31 . Therefore, because the heat of the arc tube 10 is dissipated due to conduction to the light-transmitting plate 25 through the adhesive 31 and the second reflector 30, even if the second reflector 30 is set on the arc tube 10, the light emission of the light emitting part 11 is hindered. Heat dissipation can also reduce or prevent the temperature rise of the luminous tube 10 .

Embodiment 4

FIG. 5 is a configuration diagram of a lighting device 100C in Embodiment 4. FIG. The configuration of this illuminating device 100C is basically the same as that of the illuminating device 100 of Embodiment 1 shown in FIGS. 1 and 2 , and differs from the illuminating device 100 of Embodiment 1 in the following points.

The light-transmitting plate 25 and the surface 30c of the second reflecting mirror 30 are bonded and fixed with an adhesive 31, and the through-hole 25a of the light-transmitting plate 25 and the through-hole 30b of the second reflecting mirror 30 are combined with the adhesive 31. It is bonded and fixed to the sealing portion 13 a of the arc tube 10 .

Furthermore, as shown in FIG. 5 , a cooling fin 26 is provided on the outer peripheral end of the light-transmitting plate 25 .

According to such Embodiment 4, in addition to the above-mentioned effects of Embodiment 1, the heat transferred from the arc tube 10 to the light-transmitting plate 25 through the second reflection mirror and the adhesive 31 is dissipated into the air by the cooling fins 26. , so the transfer of heat from the arc tube 10 is further promoted, and the temperature rise of the arc tube 10 can be further prevented.

Embodiment 5

FIG. 6 is a configuration diagram of a lighting device 100D in Embodiment 5. FIG. The configuration of this illuminating device 100D is basically the same as that of the illuminating device 100 of Embodiment 1 shown in FIGS. 1 and 2 , and differs from the illuminating device 100 of Embodiment 1 in the following points.

In this embodiment, the surface 30c of the second reflector 30 is bonded to the light-transmitting plate 25 through the adhesive 31 to fix the light-transmitting plate 25 and the second reflector 30, and the through-hole 25a and the through-hole 25a of the light-transmitting plate 25 A gap is provided between the through opening 30 b of the second reflection mirror 30 and the sealing portion 13 a of the arc tube 10 .

According to the configuration of Embodiment 5, the light emission is cooled by the air flowing through the gap formed between the through-hole 25a of the light-transmitting plate 25, the through-hole 30b of the second reflection mirror 30, and the sealing portion 13a of the light-emitting tube 10. The tube 10 can prevent or reduce the temperature rise of the luminous tube 10 .

Embodiment 6

FIG. 7 is a configuration diagram of a lighting device 100E in Embodiment 6. FIG. The configuration of this illuminating device 100E is basically the same as that of the illuminating device 100 of Embodiment 1 shown in FIGS. 1 and 2 , and differs from the illuminating device 100 of Embodiment 1 in the following points.

The lighting device 100E includes a light-transmitting plate 27 in which the light-transmitting plate 25 and the second reflector 30 are integrally formed. The light-transmitting plate 27 is fixed at the opening end of the first reflecting mirror 20 .

According to the configuration of Embodiment 6, the arc tube 10 is cooled by the air flowing through the gap formed between the through-hole 27a of the light-transmitting plate 27 and the sealing portion 13a of the arc tube 10, so that the discharge of the arc tube 10 can be prevented or reduced. temperature rise.

As shown in FIG. 7 , since the light-transmitting plate 25 and the second reflection mirror 30 can be integrally molded by press molding, the number of parts can be reduced.

Embodiment 7

FIG. 8 is a configuration diagram of a lighting device 100F in Embodiment 7. FIG. The configuration of this illuminating device 100F is basically the same as that of the illuminating device 100E of the sixth embodiment shown in FIG. 7 , and the points of difference from the illuminating device 100E of the sixth embodiment are as follows.

The first reflecting mirror 20A is of a size having a reflecting surface capable of reflecting approximately half of the light emitted from the rear side of the light emitting unit 11 . The plate thickness of the light-transmitting plate 28 is such that the reflective surface 32 a covering approximately half of the front side of the light emitting unit 11 can be formed. A light-transmitting plate 28 is fixed at the open end of the first reflection mirror 20A.

According to the structure of the seventh embodiment, the same effect as that of the sixth embodiment can be obtained, and even if it is a material that cannot be press-formed, it can be easily formed on the light-transmitting plate 28 as the second reflection surface by cutting and grinding. Reflective surface 32a that functions easily.

Embodiment 8

FIG. 9 is a configuration diagram of a lighting device 100G in Embodiment 8 of the present invention. The configuration of this illuminating device 100G is basically the same as that of the illuminating device 100 of Embodiment 1 shown in FIGS. 1 and 2 , and differs from the illuminating device 100 of Embodiment 1 in the following points.

In the case of the lighting device 100G according to the eighth embodiment, the arc tube 10 includes the protruding portion 16 which is a separate member from the arc tube in the vicinity of the light emitting portion 11 of the sealing portion 13a. The second reflection mirror 30A is pressed against the projection 16 by the elastic force of the spring 40 wound around the sealing portion 13a, so that the reflection surface 30a of the second reflection mirror 30 is spaced from the outer peripheral surface of the light emitting unit 11 with a gap. It is fixed to the sealing part 13a. The spring 40 is wound with a diameter larger than the outer diameter of the sealing portion 13a in consideration of thermal expansion of the sealing portion 13a. The pressing of the spring 40 toward the light emitting unit 11 can be performed, for example, by the light-transmitting plate 25 . In addition, the light-transmitting plate 25 is connected to the sealing portion 13 a in a state of being adhered and fixed by the adhesive 31 . Furthermore, the spring 40 is formed of a conductive member, and one end of the spring 40 is electrically connected to the lead wire 15b protruding from the sealing portion 13b on the opposite side to the side where the spring 40 is attached.

According to the lighting device 100G of the eighth embodiment, the utilization efficiency of light is improved due to the action of the second reflector 30A, and the increase of heat generated by the installation of the second reflector 30A is passed through the reflective surface of the second reflector 30A. 30a and the outer peripheral surface of the light-emitting part 11 is cooled, and the heat dissipation caused by heat conduction from the light-emitting tube 10 to the light-transmitting plate 25 through the adhesive 31 can prevent or reduce the temperature rise of the light-emitting tube 10 . Furthermore, since one end of the spring 40 is electrically connected to the lead wire 15b protruding from the sealing portion 13b on the opposite side to the side where the spring 40 is attached, when the lighting of the arc tube 10 is started, discharge breakdown is likely to occur and the lighting is easy.

Manufacturing of lighting fixtures

Next, the manufacturing procedure of the lighting devices 100 to 100D according to Embodiments 1 to 5 will be described. In addition, here, it demonstrates on the premise that the light-transmitting plate 25 and the 2nd reflection mirror 30 are manufactured separately. Firstly, for each luminous tube 10 , data related to the structure of the luminous tube 10 and the first reflector 20 is collected. This data includes the distance between the electrodes in the light-emitting part 11, the shape and size of each part of the light-emitting tube 10, the shape and size of the first reflector 20, the focus of the first reflector 20 (the first reflector is rotating In the case of an ellipse, the first focal point and the second focal point). Next, based on these data, a computer or the like is used to simulate the emission state of light from the light emitting unit 11 of each arc tube 10 . Next, the design of the second reflector 30 corresponding to each arc tube 10 was performed based on the simulation of the emission state of the light from the light emitting unit 11 . This design can also be performed using computer simulation or the like, and through such simulation, the shape (outer diameter, inner diameter, reflective surface shape, etc.) that can realize the function of the second reflecting mirror 30 described above is determined. Then, based on this design, the second reflection mirror 30 corresponding to each light emitting tube 10 is manufactured. Thereafter, the reflective surface 30a of the manufactured second reflecting mirror 30 is made to surround approximately half of the front side of the light emitting unit 11, and the incident light emitted from the center of the light emitting unit 11 and entered into the second reflecting mirror 30 is combined with the second reflection surface. The second reflector 30 is fixed to the sealing portion 13 a of the arc tube 10 and/or the light-transmitting plate 25 while adjusting so that the normals of the reflective surface 30 a of the reflector 30 coincide.

Used for the sealing portion 13a of the arc tube 10 and the through opening 25a of the light-transmitting plate 25 and/or the sealing portion 13a of the arc tube 10 and the through-hole 30b of the second reflector 30 and/or the light-transmitting plate 25 and the second reflector The adhesive 31 for bonding and fixing the surface 30c of 30 is preferably a silica-alumina hybrid adhesive having high temperature resistance and good thermal conductivity or an inorganic adhesive mainly composed of aluminum nitride. In addition, as one example, the product name Sumiselam (manufactured by Asahi Chemical Industries, Ltd., and Sumiselam is a registered trademark of Sumitomo Chemical Industries, Ltd.) is mentioned. In addition, it is preferable that the adhesive 31 is applied so that light rays (leakage of ultraviolet rays, infrared rays, and visible light, etc.) emitted from the light-emitting portion 11 and transmitted through the reflecting surface 30a of the second reflector 30 are not blocked. position.

Next, arrange the first reflector 20 and the luminous tube 10 as described above, so that the first focal point of the first reflector 20 is roughly consistent with the center between the electrodes 12 of the luminous tube 10 on which the second reflector 30 is fixed, and adjust the relative The position of the light emitting tube 10 of the first reflecting mirror 20 is such that the brightness at a predetermined position becomes maximum, and the light emitting tube 10 and the first reflecting mirror 20 are fixed at a proper position.

In addition, each illuminating device 100E-100G of Embodiment 6-8 shown in FIG. 7-FIG. 9 can also be manufactured based on this.

However, the lighting device provided with a structure for preventing or reducing the temperature rise of the arc tube 10 caused by the installation of the second reflecting mirror 30 in Embodiments 1 to 8 of the present invention shown in FIGS. 1 to 9 is not limited. For the application of the lighting devices 100 to 100G shown in FIGS. In the lighting device, in other lighting devices in which the reflecting surface of the second reflecting mirror 30 surrounds the periphery of the light-emitting part 11 of the arc tube 10 and is arranged opposite to the first reflecting mirror 20, it is also possible within the range not departing from the gist. It is applicable to various forms, for example, the following deformation|transformation is also possible.

The cooling fins 26 of the fourth embodiment may be combined with the configurations of the first to third embodiments and the fifth to eighth embodiments. Embodiments 1 to 3 and Embodiments 5 to 8 can also increase the effect of Embodiment 4 by combining the cooling fins 26 of Embodiment 4 with the configurations of Embodiments 1 to 3 and Embodiments 5 to 8.

Furthermore, in Embodiments 1 to 4 shown in FIGS. 1 to 5 , the light-transmitting plate 25 and the second reflection mirror 30 may be manufactured by integrally molding them. Furthermore, in the first to fifth embodiments shown in FIGS. It does not need to be fixed to the sealing part 13a, but may contact only the sealing part 13a in a heat conduction form.

In the case of Embodiments 1 to 4, the light-transmitting plate 25 does not necessarily have to be fixed at the opening end of the first reflecting mirror 20 .

The composition of the projector

Although the projector 1000 provided with the lighting device 100 will be described below, any of the lighting devices 100A to 100G can also constitute the projector 1000 in the same manner.

FIG. 10 is a configuration diagram of a projector 1000 including the lighting device 100 described above. This optical system includes: an illuminating device 100 equipped with a luminous tube 10, a first reflecting mirror 20, a light-transmitting plate 25, and a second reflecting mirror 30; The illumination optical system 300 of the unit; the color light separation optical system 380 with dichroic mirrors 382, 386, reflector 384, etc.; the relay optical system 390 with incident side lens 392, relay lens 396, reflector 394, 398; corresponding Field lenses 400, 402, 404 for each color light and liquid crystal panels 410R, 410G, 410B as light modulation devices; cross dichroic prism 420 as color light synthesis optical system; and projection lens 600.

Next, the operation of the projector 1000 configured as described above will be described. First, the emitted light from the center of the light emitting unit 11 of the light emitting tube 10 is reflected by the first reflection mirror 20 and directed toward the front of the lighting device 100 . Then, the emitted light from the front side of the center of the light emitting unit 11 is reflected by the second reflector 30 , returns to the first reflector 20 , and is reflected by the first reflector 20 to go forward of the lighting device 100 .

The light emitted from the illuminating device 100 enters the concave lens 200, where the traveling direction of the light is adjusted to be approximately parallel to the optical axis 1 of the illuminating optical system 300, and then enters each small lens of the first lens array 320 constituting the integrator lens. 321 in. The first lens array 320 splits the incident light into a plurality of partial beams corresponding to the number of small lenses 321 . The partial light beams from the first lens array 320 are incident on the second lens array 340 having small lenses 341 corresponding to the respective small lenses 321 and constituting an integrator lens. Then, the outgoing light from the second lens array 340 is condensed to the vicinity of the corresponding polarization separation film (not shown) of the polarization conversion element array 360 . At this time, the light shielding plate (not shown) is used to adjust so that, among the incident light entering the polarization conversion element array 360 , only the part corresponding to the polarization separation film enters.

In the polarization conversion element array 360, the incident light beam is converted into the same kind of linearly polarized light. Then, the plurality of partial light beams whose polarization directions are aligned by the polarization conversion element array 360 enters the overlapping lens 370, where the partial light beams irradiating the liquid crystal panels 410R, 410G, and 410B are adjusted to overlap on corresponding panel surfaces.

The color separation optical system 380 includes first and second dichroic mirrors 382 and 386, and has a function of separating the light emitted from the illumination optical system into three color lights of red, green and blue. The first dichroic mirror 382 transmits the red light component of the light emitted from the superposition lens 370, and reflects the blue light component and the green light component. The red light transmitted through the first dichroic mirror 382 is reflected by the reflection mirror 384 , passes through the field lens 400 , and reaches the liquid crystal panel 410R for red light. The field lens 400 converts each partial beam emitted from the superposition lens 370 into a beam parallel to its central axis (chief ray). The field lenses 402 and 404 provided in front of the other liquid crystal panels 410G and 410B also function in the same manner.

Furthermore, among the blue light and the green light reflected by the first dichroic mirror 382 , the green light is reflected by the second dichroic mirror 386 and reaches the liquid crystal panel 410G for green light through the field lens 402 . On the other hand, the blue light transmits the second dichroic mirror 386, passes through the relay optical system 390, that is, the incident side lens 392, the reflection mirror 394, the relay lens 396, and the reflection mirror 398, and then further passes through the field lens 404 to reach Liquid crystal panel 410B for blue light. In addition, the relay optical system 390 is used for blue light because the optical path length of blue light is longer than that of other color lights, and the purpose is to prevent reduction of light utilization efficiency due to light divergence and the like. That is, it is because the partial light beam incident on the incident-side lens 392 is transmitted directly to the field lens 404 . In addition, although the relay optical system 390 is configured to pass blue light among the three kinds of colored light, it may be configured to pass other colored light such as red light.

The three liquid crystal panels 410R, 410G, and 410B modulate the incident light of each color according to the provided image information to form images of the light of each color. In addition, polarizing plates are generally provided on the light incident surface side and the light exit surface side of the three liquid crystal panels 410R, 410G, and 410B.

The three-color modulated lights emitted from the above-mentioned liquid crystal panels 410R, 410G, and 410B enter the cross dichroic prism 420 functioning as a color-light combining optical system that combines these modulated lights to form a color image. In the cross dichroic prism 420 , the dielectric multilayer film reflecting red light and the dielectric multilayer film reflecting blue light form a substantially X-shape at the interfaces of the four rectangular prisms. Red, green, and blue three-color modulated light is synthesized by these dielectric multilayer films to form synthesized light for projecting color images. Then, the synthesized light synthesized by the cross dichroic prism 420 finally enters the projection lens 600, and is projected and displayed on a screen as a color image therefrom.

According to the above-mentioned projector 1000 , it is possible to achieve higher luminance and longer life of the projector 1000 by virtue of the already described functions of the lighting devices 100 or any one of the 100A to 100G used therein.

In addition, the projector of the present invention is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist thereof. For example, the following modifications are also possible.

In the above-mentioned embodiment, although the two lens arrays 320 and 340 for splitting the light of the illuminating device 100 into a plurality of partial beams are used, this invention can also be applied to a projector that does not use such a lens array.

In the above-mentioned embodiments, although the example of a projector using a liquid crystal panel as a light modulation device has been described, the present invention can also be applied to a modulation device other than a liquid crystal panel, for example, it can also be applied to a projector that uses a micromirror. In a projector that constitutes a modulating device for pixels.

In the above-mentioned embodiments, although an example of a projector using three light modulating devices has been described, the present invention can also be applied to projectors using one, two, or four or more light modulating devices. middle.

In the above embodiments, a projector using a transmissive liquid crystal panel has been described as an example, but the present invention can also be applied to a projector using a reflective liquid crystal panel. Here, "transmissive type" refers to a type of light modulator such as a liquid crystal panel that transmits light, and "reflective type" refers to a type that reflects light. In addition, the light modulation device is not limited to a liquid crystal panel, for example, a device using a micromirror may also be used. Furthermore, the illumination optical system of the present invention can be applied not only to a front projection projector that projects from the viewing direction, but also to a rear projection projector that projects from the opposite side to the viewing direction.

The present invention can be used not only as a lighting device for a projector but also as a lighting device for other optical devices.

Claims (14)

1. lighting device, it possesses: the luminous tube with sealing of the both sides of carrying out luminous illuminating part and being positioned at this illuminating part between pair of electrodes, keep the light that above-mentioned luminous tube and reflection send from this luminous tube and make it first speculum towards the place ahead, light-passing board with the leading section that is configured in above-mentioned first speculum, it is characterized in that

Make the front part of surrounding above-mentioned illuminating part, to second speculum of the above-mentioned first speculum lateral reflection from the light of above-mentioned illuminating part, be adhesively fixed at least one side in above-mentioned sealing and the above-mentioned light-passing board;

Above-mentioned light-passing board contacted with above-mentioned second speculum or be adhesively fixed, above-mentioned light-passing board is contacted with at least one side in above-mentioned second speculum or the above-mentioned sealing that is adhesively fixed on.

2. lighting device, it possesses: the luminous tube with sealing of the both sides of carrying out luminous illuminating part and being positioned at this illuminating part between pair of electrodes, keep the light that above-mentioned luminous tube and reflection send from this luminous tube and make it first speculum towards the place ahead, light-passing board with the leading section that is configured in above-mentioned first speculum, it is characterized in that

Make the front part of surrounding above-mentioned illuminating part, to second speculum of the above-mentioned first speculum lateral reflection from the light of above-mentioned illuminating part, be adhesively fixed on the above-mentioned light-passing board;

Between above-mentioned light-passing board and above-mentioned second speculum and above-mentioned luminous tube, be provided with the gap.

3. according to claim 1 or 2 described lighting devices, it is characterized in that,

Above-mentioned being adhesively fixed is by being adhesively fixed that bonding agent carries out.

4. according to the described lighting device of claim 3, it is characterized in that,

Above-mentioned bonding agent is aluminium nitride class or silica and aluminium oxide mixing class bonding agent.

5. lighting device, it possesses: the luminous tube with sealing of the both sides of carrying out luminous illuminating part and being positioned at this illuminating part between pair of electrodes, keep the light that above-mentioned luminous tube and reflection send from this luminous tube and make it first speculum towards the place ahead, light-passing board with the leading section that is configured in above-mentioned first speculum, it is characterized in that

Surround the front part, integrally formed from above-mentioned second speculum and the above-mentioned light-passing board of the light of above-mentioned illuminating part of above-mentioned illuminating part to the above-mentioned first speculum lateral reflection.

6. lighting device, it possesses: the luminous tube with sealing of the both sides of carrying out luminous illuminating part and being positioned at this illuminating part between pair of electrodes, keep the light that above-mentioned luminous tube and reflection send from this illuminating part and make it first speculum towards the place ahead, light-passing board with the leading section that is configured in above-mentioned first speculum, it is characterized in that

Possess the front part of surrounding above-mentioned illuminating part, to second speculum of the above-mentioned first speculum lateral reflection from the light of this illuminating part;

The outer peripheral face of above-mentioned second speculum and above-mentioned illuminating part separates subtend configuration with gap, and by have the spring on the periphery that is wound on above-mentioned sealing with gap for this outer peripheral face, is fixed near the above-mentioned illuminating part and be pressed.

7. according to the described lighting device of claim 6, it is characterized in that,

Constitute above-mentioned spring by the electric conductivity coil, an end of this electric conductivity coil is connected on the lead-in wire that stretches out from the sealing with the above-mentioned spring side opposition side of configuration.

8. according to claim 6 or 7 described lighting devices, it is characterized in that,

Above-mentioned light-passing board is adhesively fixed with bonding agent on the above-mentioned sealing.

9. according to the described lighting device of claim 8, it is characterized in that,

Above-mentioned bonding agent is aluminium nitride class or silica and aluminium oxide mixing class bonding agent.

10. according to any one the described lighting device in the claim 1～9, it is characterized in that,

Above-mentioned light-passing board is by the low material of the coefficient of thermal expansion with light transmission or have any in the high material of the pyroconductivity of light transmission and constitute.

11. any one the described lighting device according in the claim 1～10 is characterized in that,

The substrate of above-mentioned second speculum is made of any in the high material of the low material of coefficient of thermal expansion or pyroconductivity.

12. any one the described lighting device according in the claim 1～11 is characterized in that,

The peripheral part of above-mentioned light-passing board is provided with fin.

13. any one the described lighting device according in the claim 1～12 is characterized in that,

One end of above-mentioned sealing is side-prominent to open area from running through above-mentioned light-passing board ground by above-mentioned first speculum and above-mentioned light-passing board institute area surrounded.

14. a projector, it possess lighting device and incident from the light of this lighting device, modulate the optic modulating device of this incident light corresponding to the image information that is provided, it is characterized in that,

As above-mentioned lighting device, possesses each the described lighting device in the claim 1～13.

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