JP2005077585A - Lamp device and projector equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lamp device realizing the improvement of startability in spite of simple constitution as a lamp device equipped with an auxiliary 2nd reflection mirror, and provide a projector equipped with the lamp device. <P>SOLUTION: The lamp device includes a light emitting tube 10 having a light emitting part 11 for emitting light between a pair of electrodes 12a and 12b and sealing parts 13a and 13b positioned on both sides of the light emitting part 11, a 1st reflection mirror 20 for holding either sealing part 13a of the light emitting tube 10 and reflecting light radiated from the light emitting tube 10 and turning it forward, the 2nd reflection mirror 30 proximately surrounding an opposite side part to the holding part side of the light emitting part 11 of the light emitting tube 10 held by the 1st reflection mirror 20 and reflecting the light from the light emitting part 11 to the 1st reflection mirror 20 side. The 2nd reflection mirror 30 is composed of a conductive material so as to function also as an auxiliary electrode. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lamp device used for a projector or the like, and a projector including the same.

  Conventionally, a lamp device including a light emitting tube having a light emitting portion having a pair of electrodes on the inside and a first reflecting mirror that directs light emitted from the light emitting tube in a predetermined direction is sandwiched between the light emitting tube and a first lamp. A second reflecting mirror made of quartz or the like is provided at a position facing the first reflecting mirror so that the light that has not been used since it becomes stray light even if it is emitted from the arc tube can be used effectively. (For example, refer to Patent Document 1).

  Further, conventionally, in a light source device including an arc tube in which a pair of electrodes are sealed at both ends and a bowl-shaped reflecting mirror that reflects light emitted from the arc tube, a trigger wire is wound around the outer periphery of the arc tube, One end of the trigger wire is placed close to one electrode side of the arc tube, and the other end of the trigger wire is connected to an external lead derived from the other electrode of the arc tube to improve startability. (For example, refer to Patent Document 2).

JP-A-8-31382 (2nd page, FIG. 1) JP-A-8-69777 (page 3, FIG. 1)

  In the technique of Patent Document 1, the second reflecting mirror is arranged away from the outer surface of the arc tube, and the outer diameter of the second reflecting mirror is also large. However, if the outer diameter of the second reflecting mirror is large, a large amount of light reflected by the first reflecting mirror and traveling toward the second reflecting mirror is blocked. It is preferable that the diameter is reduced and the light emitting unit is attached so as to be surrounded in the vicinity. In recent years, there has been a demand for providing an electrode for assisting starting even in a lamp device of this type including the second reflecting mirror of this type. However, in the case where the second reflecting mirror is attached close to the periphery of the light emitting portion of the arc tube, if it is attempted to meet this demand, there is a problem that it is difficult to route the trigger line, resulting in a complicated configuration. there were.

  The present invention has been made in view of the above points, and in a lamp device provided with an auxiliary second reflecting mirror, a lamp device capable of improving startability while having a simple configuration, and An object of the present invention is to provide a projector provided with the projector.

  A lamp device according to the present invention includes a light emitting portion that emits light between a pair of electrodes, a light emitting tube having sealing portions located on both sides of the light emitting portion, and one sealing portion of the light emitting tube to emit light. The first reflecting mirror that reflects the light emitted from the tube and directs it forward, and the portion opposite to the holding portion side of the light emitting portion of the arc tube held by the first reflecting mirror are closely surrounded to surround the light emitting portion. And a second reflecting mirror that reflects light from the first reflecting mirror side, and the second reflecting mirror is made of a conductive material so as to function as an auxiliary electrode. According to this, it is possible to improve the startability with a simple configuration without complicating the configuration.

  In the lamp device according to the present invention, the second reflecting mirror is electrically connected to an electrode on the opposite side of the pair of electrodes from the side on which the second reflecting mirror is formed. In this way, power is supplied to the second reflecting mirror.

  In the lamp device according to the present invention, the conductive material constituting the second reflecting mirror is a metal. According to this, compared with the case where it consists of the conventional quartz, thermal conductivity becomes high and it becomes possible to heighten the heat radiation effect of the arc tube. For this reason, there exists an effect which can prevent the lifetime reduction of the arc tube resulting from the temperature rise of an arc tube.

  In the lamp device according to the present invention, the metal is a refractory metal.

  Further, the lamp device according to the present invention includes a concave surface portion in which the second reflecting mirror surrounds and surrounds a portion opposite to the holding portion side of the light emitting portion of the arc tube held by the first reflecting mirror; And a hollow cylindrical mounting portion extending outward from the center of the mounting portion, and is fixed in a state where one of the sealing portions is inserted into the mounting portion. Thus, the provision of the attachment portion facilitates attachment of the second reflecting mirror to the arc tube.

  A projector according to the present invention includes any one of the lamp devices described above, a light modulation device that modulates a light beam emitted from the lamp device, and a projection optical system that projects the light beam modulated by the light modulation device. It is a thing. As a result, a projector having a high brightness and a long life can be obtained.

FIG. 1 is a diagram showing a lamp device according to an embodiment of the present invention.
The lamp device 100 holds the arc tube 10 and one sealing portion 13a (described later) of the arc tube 10, reflects the light emitted from the arc tube 10 and directs it forward, A second portion of the arc tube 10 held by the reflecting mirror 20 surrounds the portion opposite to the holding portion side of the light emitting portion 11 described later, and reflects light from the light emitting portion 11 toward the first reflecting mirror 20 side. And a reflecting mirror 30.

  The arc tube 10 is made of quartz glass or the like, and includes a pair of tungsten electrodes 12a and 12b, a central light emitting unit 11 in which mercury, a rare gas, and a small amount of halogen are sealed, and sealing on both sides of the light emitting unit 11. It consists of parts 13a and 13b. Metal foils 14a and 14b made of molybdenum connected to the electrodes 12a and 12b are sealed in the sealing portions 13a and 13b, and lead wires 15a and 15b connected to the outside are provided on the metal foils 14a and 14b, respectively. It has been. The connection destinations of the lead wires 15a and 15b may be the same as those in the conventional configuration, and are connected to, for example, an external connection terminal provided on a lighting device fixture or the like (not shown).

  In the illumination optical system including the arc tube 10, the first reflecting mirror 20 is a reflecting element disposed on the rear side of the light emitting unit 11, and has a through hole 21 for fixing the arc tube 10 at the center. I have. The arc tube 10 is inserted into the through-hole 21 of the first reflecting mirror 20 so that the sealing portion 13a thereof is aligned with the axis of the arc tube 10 and the axis of the first reflecting mirror 20, where inorganic materials such as cement are used. It is fixed and held by the adhesive 22. In addition, when the 1st reflective mirror 20 is an ellipsoid shape, the light emission part 11 center (the center between the electrodes 12a and 12b) of the arc_tube | light_emitting_tube 10 is located in the 1st focus (F1) or its vicinity, and is located in the vicinity. When the one reflecting mirror 20 is a paraboloid, it is coincident with the focal point F or positioned in the vicinity thereof. That is, the center of the light emitting unit 11 is arranged in the vicinity of the focal point F1 or F of the first reflecting mirror 20 or substantially coincident with the position of the focal point F1 or F. Here, the reflecting surface of the first reflecting mirror 20 has an elliptical shape, but may have another shape such as a parabolic shape.

  The second reflecting mirror 30 is made of a metal as a conductive material, and has a concave surface portion 31 and an attachment portion 32. The concave portion 31 closely surrounds the portion of the arc tube 10 held by the first reflecting mirror 20 on the side opposite to the holding portion side of the light emitting portion 11, and the inner surface is mirror-finished to serve as a reflecting surface. It functions. The attachment portion 32 has a hollow cylindrical shape that extends outward from the central portion of the concave surface portion 31. In the second reflecting mirror 30 having such a configuration, the arc tube is formed by the inorganic adhesive 33 such as cement in a state where the sealing portion 13b is inserted into the mounting portion 32 so that the axis of the sealing portion 13b coincides with the axis of the second reflecting mirror 30. 10 sealing portions 13b.

  The second reflecting mirror 30 made of metal is electrically connected to the electrode 12a on the opposite side of the pair of electrodes 12a and 12b in the light emitting unit 11 from the side on which the second reflecting mirror 30 is disposed. It is configured to be connected and supplied with power. Specifically, the feeder 40 connected to the outer surface of the second reflecting mirror 30 is connected to the lead wire 15a extending from the sealing portion 13a, and the second reflecting mirror 30 and the electrode 12a are electrically connected. ing. In this way, by configuring the second reflecting mirror 30 with a conductive material and performing the electrical connection described above, the second reflecting mirror 30 has a function as an auxiliary electrode in addition to a function as a reflecting mirror. It has the same structure.

  Although the second reflecting mirror 30 is made of metal, the second reflecting mirror 30 is exposed to a high temperature of about 900 to 1000 ° C., and therefore, a high melting point metal such as tantalum, molybdenum, tungsten, or the like. It is desirable to comprise.

  In the lamp device 100 configured as described above, when a high voltage pulse voltage for starting is applied to the arc tube 10, first, the electrode 12b and the second reflecting mirror 30 disposed in the vicinity of the electrode 12b are firstly provided. Auxiliary discharge occurs between the two. Then, discharge between the electrodes 12a and 12b is started, and lighting is started.

  According to the present embodiment, since the second reflecting mirror 30 is made of a conductive material so as to function as an auxiliary electrode, the startability is improved with a simple configuration without complicating the configuration. It becomes possible.

  In addition, since the second reflecting mirror 30 is made of metal, the thermal conductivity is higher than that of a conventional quartz, and the heat radiation effect of the arc tube 10 can be enhanced. For this reason, there exists an effect which can prevent the lifetime reduction of the arc tube resulting from the temperature rise of the arc tube 10.

  In addition, since the 2nd reflective mirror 30 has the attaching part 32, compared with the case where the attaching part 32 is not provided temporarily, the attachment to the arc_tube | light_emitting_tube 10 becomes easy.

  FIG. 1 shows an example in which the power supply line 40 is wired along the sealing portion 13a when the lead 15a and the second reflecting mirror 30 are electrically connected. As shown in FIG. A through-hole 23 is provided in the reflecting mirror 20 and one end of the power supply line 40 ′ connected to the lead 15 a is introduced from the outside of the first reflecting mirror 20 into the first reflecting mirror 20 through the through-hole 23. The end may be connected to the second reflecting mirror 30.

  Next, an optical system of a projector in which the lamp device 100 configured as described above is incorporated will be described.

FIG. 3 is a diagram showing an optical system of the projector, and shows a schematic sectional view of the projector.
The projector 1000 includes an illumination optical system 300 including the lamp device 100, a color light separation optical system 380 including dichroic mirrors 382 and 386, reflection mirrors 372 and 384, an incident side lens 392, a relay lens 396, and a reflection mirror 394. 398, a relay optical system 390, field lenses 400, 402, 404 corresponding to each color light, and liquid crystal panels 410R, 410G, 410B as light modulation devices, a cross dichroic prism 420 which is a color light combining optical system, and projection optics And a projection lens 600 which is a system.

  Next, the operation of the projector 1000 having the above configuration will be described. First, the emitted light from the rear side of the light emitting portion 11 of the arc tube 10 is reflected by the first reflecting mirror 20 and travels forward of the lamp device 100. Further, the outgoing light from the front side of the center of the light emitting unit 11 is reflected by the second reflecting mirror 30 and returns to the first reflecting mirror 20, and then reflected by the first reflecting mirror 20 and heads forward of the lamp device 100. .

  The light exiting the lamp device 100 enters the concave lens 310, where the traveling direction of the light is adjusted substantially parallel to the optical axis of the illumination optical system 300, and then each small lens 321 of the first lens array 320 constituting the integrator lens. Is incident on. The first lens array 320 divides incident light into a plurality of partial light beams corresponding to the number of small lenses 321. Each partial light beam exiting the first lens array 320 is incident on a second lens array 340 constituting an integrator lens having small lenses 341 respectively corresponding to the small lenses 321. Then, the emitted light from the second lens array 340 is condensed in the vicinity of the corresponding polarization separation film (not shown) of the polarization conversion element array 360. At this time, light is adjusted by a light shielding plate (not shown) so that light is incident only on a portion corresponding to the polarization separation film in the incident light to the polarization conversion element array 360.

  In the polarization conversion element array 360, the light beam incident thereon is converted into the same type of linearly polarized light. The plurality of partial light beams whose polarization directions are aligned by the polarization conversion element array 360 enters the superimposing lens 370, where each partial light beam that irradiates the liquid crystal panels 410R, 410G, and 410B has a weight on the corresponding panel surface. It is adjusted so that it fits.

  The color light separation optical system 380 includes first and second dichroic mirrors 382 and 386, and separates the light emitted from the illumination optical system 300 and reflected by the reflection mirror 372 into three color lights of red, green, and blue. It has a function to do. The first dichroic mirror 382 transmits the red light component of the light emitted from the superimposing 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 light beam emitted from the superimposing lens 370 into a light beam parallel to the central axis (principal ray). The field lenses 402 and 404 provided in front of the other liquid crystal panels 410G and 410B operate in the same manner.

  Further, of the blue light and green light reflected by the first dichroic mirror 382, the green light is reflected by the second dichroic mirror 386 and reaches the green light liquid crystal panel 410 </ b> G through the field lens 402. On the other hand, the blue light passes through 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 further passes through the field lens 404. The light reaches the light liquid crystal panel 410B. The reason why the relay optical system 390 is used for blue light is to prevent a decrease in light use efficiency due to light divergence or the like because the optical path length of blue light is longer than the optical path length of other color lights. is there. That is, this is to transmit the partial light beam incident on the incident side lens 392 to the field lens 404 as it is. The relay optical system 390 is configured to pass blue light out of the three color lights, but may be configured to pass other color light such as red light.

  The three liquid crystal panels 410R, 410G, and 410B modulate each incident color light according to given image information to form an image of each color light. A polarizing plate is usually provided on the light incident surface side and the light emitting surface side of the three liquid crystal panels 410R, 410G, and 410B.

  The three colors of modulated light emitted from each of the liquid crystal panels 410R, 410G, and 410B enter a cross dichroic prism 420 having a function as a color light combining optical system that combines these modulated lights to form a color image. In the cross dichroic prism 420, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X shape at the interface of four right-angle prisms. These dielectric multilayer films combine the three colors of red, green, and blue modulated light to form combined light for projecting a color image. The synthesized light synthesized by the cross dichroic prism 420 finally enters the projection lens 600 and is projected and displayed as a color image on the screen.

  In the projector 1000 configured as described above, since the lamp device 100 according to the present invention is used, the projector described above can achieve high brightness and long life due to the operation described above.

  In the above-described embodiment, a projector using a transmissive liquid crystal panel has been described as an example. However, the present invention can also be applied to a projector using a reflective liquid crystal panel. Here, “transmission type” means that a light modulation device such as a liquid crystal panel is a type that transmits light, and “reflection type” means that it is a type that reflects light. I mean. The light modulation device is not limited to a liquid crystal panel, and may be a device using a micromirror, for example. Furthermore, the lamp device of the present invention can be applied to a front projection projector that projects from the viewing direction, and a rear projection projector that projects from the opposite side to the viewing direction.

The block diagram of the lamp device of one embodiment of the present invention (the 1). The block diagram (the 2) of the lamp | ramp apparatus of one Embodiment of this invention. The figure which shows the optical system of a projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light emission tube, 11 Light emission part, 12a, 12b Electrode, 13a, 13b Sealing part, 20 1st reflective mirror, 30 2nd reflective mirror, 100 Lamp apparatus, 410R, 410G, 410B Liquid crystal panel (light modulation apparatus), projection Lens (projection optical system), 1000 projector

Claims (6)

A light-emitting portion that emits light between a pair of electrodes, and an arc tube having sealing portions located on both sides of the light-emitting portion;
A first reflecting mirror that holds one sealing portion of the arc tube and reflects the light emitted from the arc tube toward the front;
A second reflection that closely surrounds a portion of the arc tube held by the first reflecting mirror that is opposite to the holding section side of the light emitting section and reflects light from the light emitting section to the first reflecting mirror side. With a mirror,
A lamp device characterized in that the second reflecting mirror is made of a conductive material so as to function as an auxiliary electrode.   The lamp according to claim 1, wherein the second reflecting mirror is electrically connected to an electrode on the opposite side of the pair of electrodes to the side on which the second reflecting mirror is formed. apparatus.   The lamp device according to claim 1 or 2, wherein the conductive material constituting the second reflecting mirror is a metal.   4. The lamp device according to claim 3, wherein the metal is a refractory metal.   The second reflecting mirror extends outwardly from a concave portion that closely surrounds and surrounds a portion of the arc tube held by the first reflecting mirror opposite to the holding portion side of the light emitting portion, and a central portion of the concave portion. The lamp according to any one of claims 1 to 4, wherein the lamp has a hollow cylindrical mounting portion, and is fixed in a state where one of the sealing portions is inserted into the mounting portion. apparatus. 6. The lamp device according to claim 1, a light modulation device that modulates a light beam emitted from the lamp device, and a projection optical system that projects the light beam modulated by the light modulation device. A projector characterized by comprising.

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