JP2006030495A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of moderating load imposed on the connection part of a sealing part and a lead wire when the light source device is thermally expanded or when the lead wire is wired, and a projector. <P>SOLUTION: The light source lamp unit 10 is equipped with; a light emitting tube 11 having a light emitting part 111 radiating luminous flux through an electrode 114, a pair of sealing parts 112 and 113 respectively extended on both sides of the light emitting part 111, and the lead wires 200 and 210 conducting the electrode 114 to an external power source; and a reflector 12 having a concave reflection surface 124 and emitting the luminous flux radiated from the light emitting tube 11 from an aperture after adjusting it to be uniform in a prescribed direction. The light emitting tube 11 is provided so that either sealing part 112 may project to the luminous flux emitting front side of the reflector 12, and the lead wire 200 extended from either sealing part 112 has a bent part for cushioning 220 bent on the way to be extended from the sealing part 112 to the aperture end 125 of the reflector 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device and a projector.

Conventionally, projectors that modulate a light beam emitted from a light source according to image information and enlarge and project an optical image have been used together with personal computers for presentations at conferences, academic conferences, and exhibitions. Is also used.
As a light source device of this projector, a lamp with a reflector attached to various arc tubes such as a metal halide lamp, a high pressure mercury lamp, a halogen lamp, etc. is used, and by means of lead wires welded to the sealing bases on both sides of the arc tube. The arc tube and the external power source are configured to be electrically connected (for example, Patent Document 1). Here, the sealing portion of the arc tube protrudes to the inner surface side of the reflector. Then, the lead wire extends straight from the projecting tip side sealing portion to the hole formed in the reflector, and is drawn out of the reflector from this hole.
Further, in the configuration like the light source device 10 ′ shown in FIG. 8, since the opening diameter of the reflector 12 and the dimension in the optical axis direction are small, one sealing portion 112 of the arc tube 11 protrudes from the opening of the reflector 12. Yes. The lead wire 200 extends substantially straight from the clasp 116 at the tip of the sealing portion 112 on the protruding tip side to the opening end 125 of the reflector 12. The lead wire 200 is attached to a connection terminal disposed on the side of the reflector 12 by means such as welding, and is connected to an external power source via the connection terminal.

JP-A-11-142971 (FIG. 1)

  However, in the configuration shown in Patent Document 1 and FIG. 8, when the arc tube is turned on, the arc tube, the reflector, the lead wire, and the like are thermally expanded at the respective thermal expansion coefficients, and the positional relationship is changed. The lead wire may be pulled or, conversely, a force may be applied in the compression direction of the lead wire. In this case, a load is applied to the tip of the sealing portion on the protruding tip end to which the lead wire is attached. Also, when a lead wire is routed around the connection terminal, an external force may act in the direction of expansion and contraction of the lead wire, and in this case as well, a load is applied to the welded portion of the lead wire at the end of the sealing portion. As described above, when a load is applied to the welded portion at the tip of the sealing portion, the lead wire tends to be detached from the sealing portion, and the arc tube may be damaged or broken by this load. There is a problem of affecting the embeddability and reliability.

  In view of the above problems, an object of the present invention is to provide a light source device that can relieve the load on the tip of the sealing portion during thermal expansion of the light source device or lead wire wiring, and a projector including the light source device. .

  The light source device of the present invention includes a light emitting unit that emits a light beam through an electrode, a pair of sealing units that extend on both sides of the light emitting unit, and an electrode and an external power source that are electrically connected to each other from the tip of the sealing unit. A light source device comprising: an arc tube having a lead wire extending; and a reflector having a concave reflecting surface for aligning a light beam radiated from the arc tube in a predetermined direction and exiting from an opening, wherein the arc tube comprises: One sealing portion of the pair of sealing portions is provided so as to protrude forward of light emission of the reflector, and the lead wire extending from the one sealing portion is connected to the one sealing portion from the one sealing portion. It has the bending part for buffering which bends in the middle of extending to the opening edge part of a reflector, It is characterized by the above-mentioned.

According to this invention, when thermal expansion occurs in the arc tube, reflector, etc., when the lead wire is routed during wiring, or when an external force is applied, the lead wire is pulled or force is applied in the compression direction. Even when the lead wire is applied, a bent portion having a bent shape that is deformed with respect to the force acting in the expansion / contraction direction of the lead wire serves as a buffer portion against the force acting on the lead wire.
As a result, the load applied to the attachment portion of the lead wire drawn out from the tip of the sealing portion can be alleviated, so that the lead wire is not detached from the sealing portion, and breakage or failure of the arc tube can be efficiently prevented. As a result, it is possible to improve the reliability and incorporation of the light source device.

  In the light source device of the present invention, when the lead wire having the bent portion is viewed from the front of the opening of the reflector along the central axis of the light beam emitted from the reflector, the lead wire of the reflector is It is preferable that it extends substantially linearly over the opening end.

According to the present invention, since the lead wire has a short dimension across the optical path of the light beam emitted from the reflector from the tip of the sealing portion to the opening end of the reflector, the amount of light shielded by the lead wire can be suppressed and the light use efficiency can be improved. It can contribute to improvement.
In addition, when the opening of a reflector is circular, it is preferable that the lead wire is extended from the light emission part vicinity according to this circular radial position. As a result, the lead wire can be made the shortest dimension across the optical path of the light beam emitted from the reflector, so that the amount of light shielded by the lead wire can be further reduced.

In the light source device of the present invention, the bent portion includes a portion extending from the one sealing portion toward the light emitting portion substantially along a central axis of a light beam emitted from the reflector, and the one sealing portion. It has a substantially L-shape configured by a portion that is bent at a substantially right angle from a portion extending toward the light emitting portion and extends along a direction substantially perpendicular to the central axis of the light beam emitted from the reflector. preferable.
According to the present invention, light shielding by the lead wire hardly occurs in the portion of the L-shaped portion where the lead wire extends substantially along the central axis of the light beam emitted from the reflector. The other portion of the L-shaped portion extends linearly along a direction perpendicular to the central axis of the light beam emitted from the reflector, so that, for example, the lead wire extends from the tip of the sealing portion to the opening of the reflector. Compared to the case where the light beam extends obliquely to the end, the dimension of the lead wire crossing the optical path of the light beam emitted from the reflector can be shortened. Thereby, the amount of light shielded by the lead wire can be suppressed as much as possible, and the light utilization efficiency can be improved.

In the light source device of the present invention, the bent portion bends in a direction intersecting the substantially straight portion in a substantially straight portion of the previous lead wire extending from the tip end of the one sealing portion to the opening end portion of the reflector. It is preferable to have a substantially U-shape that is folded back to return to a straight line.
Here, the U-shape of the bent portion is formed such that the U-shaped axis intersects the lead wire shape before and after the U-shaped axis.
According to this invention, the expansion / contraction force of the lead wire is buffered by opening and closing the U-shaped bent portion. Thereby, the load concerning the front-end | tip of a sealing part can be relieve | moderated and an incorporating property and reliability can be improved.

Further, in the light source device of the present invention, the reflector is an elliptical reflector having a spheroidal reflecting surface, and includes a sub-reflecting mirror provided with a reflecting surface arranged to face the reflecting surface of the elliptical reflector, The reflecting surface of the sub-reflecting mirror preferably reflects the light beam emitted from the arc tube to the elliptical reflector.
According to this configuration, the light beam emitted from the light emitting part to the side opposite to the reflecting surface of the elliptical reflector is returned to the elliptical reflector side by the sub-reflector, and almost all the light flux emitted from the light emitting part is reflected by the elliptical reflector. Since the light is converged to the second focal position on the emission front side, the light use efficiency can be greatly improved.
Furthermore, this sub-reflecting mirror can reduce the opening diameter of the elliptical reflector and the dimension in the optical axis direction, so that the light source device can be miniaturized.
Further, since the light beam emitted from the light emitting portion is converged by the elliptical reflector and emitted from the elliptical reflector, the size of the optical path traversed by the lead wire can be shortened. Thereby, the amount of light shielded by the lead wire can be suppressed as much as possible, and the light utilization efficiency can be improved.

A projector according to the present invention is a projector that modulates a light beam emitted from a light source in accordance with image information to form an optical image and projects an enlarged image, and includes the light source device described above.
According to this invention, since the light source device has the operations and effects as described above, the same operations and effects can be enjoyed. In other words, it is possible to efficiently prevent disconnection of the lead wire, breakage of the arc tube, and failure that are likely to occur during thermal expansion, lead wire handling, or disturbance, etc. Reliability can be increased.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the optical system of the projector 1 in the first embodiment of the present invention. The projector 1 is an optical device that modulates a light beam emitted from a light source in accordance with image information to form an optical image and projects it on a screen in an enlarged manner. The projector 1 includes a light source lamp unit 10 serving as a light source device, uniform illumination optics, and the like. The system 20, the color separation optical system 30, the relay optical system 35, the optical device 40, and the projection optical system 50 are configured, and the optical elements constituting the optical systems 20 to 35 are set with a predetermined illumination optical axis A. The optical component housing 2 is positioned and adjusted and stored.

The light source lamp unit 10 converges and emits a light beam emitted from the light source lamp 11 at a certain position and illuminates the optical device 40. As will be described in detail later, the light source lamp unit 11, the elliptical reflector 12, and the sub-reflection are described later. A mirror 13 and a collimating concave lens 14 are provided.
The light beam emitted from the light source lamp 11 is emitted as convergent light converged to the front side of the apparatus by the elliptical reflector 12, collimated by the collimating concave lens 14, and emitted to the uniform illumination optical system 20. The central axis of the light beam emitted from the elliptical reflector 12 coincides with the illumination optical axis A.

The uniform illumination optical system 20 is an optical system that divides the light beam emitted from the light source lamp unit 10 into a plurality of partial light beams and uniformizes the in-plane illuminance of the illumination region. The first lens array 21 and the second lens array 22, a PBS array 23, a condenser lens 24, and a reflection mirror 25.
The first lens array 21 has a function as a light beam splitting optical element that splits the light beam emitted from the light source lamp 11 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the illumination optical axis A. A plurality of small lenses are provided, and the contour shape of each small lens is set so as to be substantially similar to the shape of the image forming area of the liquid crystal panels 42R, 42G, and 42B constituting the optical device 40 described later. Yes.
The second lens array 22 is an optical element that collects a plurality of partial light beams divided by the first lens array 21 described above, and in the same manner as the first lens array 21, a matrix is formed in a plane orthogonal to the illumination optical axis A. However, since it is intended to collect light, the outline shape of each small lens corresponds to the shape of the image forming area of the liquid crystal panels 42R, 42G, and 42B. There is no need.

The PBS array 23 is a polarization conversion element that aligns the polarization direction of each partial light beam divided by the first lens array 21 with linear polarization in one direction.
Although not shown, the PBS array 23 has a configuration in which polarization separation films and reflection mirrors that are inclined with respect to the illumination optical axis A are alternately arranged. The polarization separation film transmits one polarized light beam among the P-polarized light beam and S-polarized light beam included in each partial light beam, and reflects the other polarized light beam. The other polarized light beam reflected is bent by the reflecting mirror and emitted in the emission direction of the one polarized light beam, that is, the direction along the illumination optical axis A. Either the P-polarized light beam or the S-polarized light beam of the emitted polarized light beam is polarized and converted by the phase difference plate provided on the light beam exit surface of the PBS array 23, and the polarization directions of all the polarized light beams are aligned in one direction. By using such a PBS array 23, the light beam emitted from the light source lamp 11 can be aligned with a polarized light beam in one direction, so that the utilization factor of the light source light used in the optical device 40 can be improved. .

The condenser lens 24 is an optical element that condenses a plurality of partial light beams that have passed through the first lens array 21, the second lens array 22, and the PBS array 23 and superimposes them on the image forming regions of the liquid crystal panels 42R, 42G, and 42B. is there. In this example, the condenser lens 24 is a spherical lens whose incident side end surface of the light beam transmission region is flat and whose exit side end surface is spherical. However, an aspherical lens whose exit side end surface is a hyperboloid can also be used.
The light beam emitted from the condenser lens 24 is bent by the reflection mirror 25 and emitted to the color separation optical system 30.

The color separation optical system 30 includes two dichroic mirrors 31 and 32, and a reflection mirror 33. A plurality of partial light beams emitted from the uniform illumination optical system 20 from the dichroic mirrors 31 and 32 are converted into red (R), It has a function of separating light of three colors, green (G) and blue (B).
The dichroic mirrors 31 and 32 are optical elements in which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam of another wavelength is formed on the substrate. The dichroic mirror 31 disposed in the front stage of the optical path is A mirror that transmits red light and reflects other color light. The dichroic mirror 32 disposed in the latter stage of the optical path is a mirror that reflects green light and transmits blue light.

  The relay optical system 35 includes an incident side lens 36, a relay lens 38, and reflection mirrors 37 and 39, and has a function of guiding the blue light transmitted through the dichroic mirror 32 constituting the color separation optical system 30 to the optical device 40. Have. The reason why such a relay optical system 35 is provided in the optical path of the blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, so that the light use efficiency is reduced due to light divergence or the like. It is for preventing. In this example, since the optical path length of blue light is long, such a configuration is adopted. However, a configuration in which the optical path length of red light is increased and the relay optical system 35 is disposed in the optical path of red light is also conceivable.

  The red light separated by the dichroic mirror 31 described above is bent by the reflection mirror 33 and then supplied to the optical device 40 via the field lens 41. Further, the green light separated by the dichroic mirror 32 is supplied to the optical device 40 through the field lens 41 as it is. Further, the blue light is condensed and bent by the lenses 36 and 38 and the reflecting mirrors 37 and 39 constituting the relay optical system 35 and supplied to the optical device 40 via the field lens 41. The field lens 41 provided in the front stage of the optical path of each color light of the optical device 40 is provided to convert each partial light beam emitted from the second lens array 22 into a light beam parallel to the illumination optical axis A. ing.

  The optical device 40 modulates an incident light beam according to image information to form a color image, and a liquid crystal panel 42 (42R, 42G, 42B) as a light modulation device to be illuminated and color combining optics. And a cross dichroic prism 43 as a system. An incident-side polarizing plate 44 is interposed between the field lens 41 and the liquid crystal panels 42R, 42G, and 42B. Although not shown, between the liquid crystal panels 42R, 42G, and 42B and the cross dichroic prism 43, the illustration is omitted. In this case, an exit side polarizing plate is interposed, and light modulation of incident color light is performed by the entrance side polarizing plate 44, the liquid crystal panels 42R, 42G, and 42B, and the exit side polarizing plate.

  The liquid crystal panels 42R, 42G, and 42B are a pair of transparent glass substrates in which liquid crystal, which is an electro-optical material, is hermetically sealed. For example, incident side polarization is performed according to a given image signal using a polysilicon TFT as a switching element. The polarization direction of the polarized light beam emitted from the plate 44 is modulated. The image forming area for modulating the liquid crystal panels 42R, 42G, and 42B is rectangular, and the diagonal dimension is 0.7 inches, for example.

The cross dichroic prism 43 is an optical element that synthesizes an optical image modulated for each color light emitted from the exit side polarizing plate to form a color image. The cross dichroic prism 43 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. One of the approximately X-shaped dielectric multilayer films reflects red light, and the other dielectric multilayer film reflects blue light. These dielectric multilayer films cause red light and blue light to be reflected. The light is 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 43 is enlarged and projected by the projection optical system 50 to form a large screen image on a screen (not shown).

FIG. 2 is a view showing the light source lamp unit 10 from obliquely rearward.
The light source lamp unit 10 includes the light source lamp 11, the elliptical reflector 12, the sub-reflecting mirror 13, the collimating concave lens 14, the holding member 16 that holds the collimating concave lens, and the lamp housing 15. .
The light source lamp 11 as a light-emitting tube is composed of a quartz glass tube having a central portion swelled in a spherical shape. A stop 113 is formed. In the pair of sealing portions 112 and 113, one sealing portion is a first sealing portion 112 and the other sealing portion is a second sealing portion 113.
The light source lamp 11 employs a metal halide lamp in the present embodiment, but includes various discharge lamps such as a high pressure mercury lamp, an ultra high pressure mercury lamp, a xenon lamp, and a halogen lamp. A lamp can be adopted.

FIG. 3 is a side sectional view of the light source lamp unit 10.
Inside the light emitting unit 111, a pair of tungsten electrodes 114 spaced apart by a predetermined distance, mercury, a rare gas, and a small amount of halogen are enclosed.
Molybdenum metal foils 115 electrically connected to the respective electrodes 114 of the light emitting part 111 are inserted into the sealing parts 112 and 113, respectively. These metal foils 115 are electrically connected to lead wires 118 connected to the outside, and are drawn out from the sealing portions 112 and 113 to the outside. The lead wire 118 drawn from the tip of the first sealing portion 112 is electrically connected to the lead wire 200 via the clasp 116. The lead wire 118 drawn from the tip of the second sealing portion 113 is drawn to the outside through a base 117 provided so as to cover the tip of the second sealing portion 113, and connected to the lead wire 210. Yes. These lead wires 200 and 210 are connected to the clasp 116 and the base 117 by soldering or crimping, respectively. When a voltage is applied from an external power source through the lead wires 200 and 210, an arc is generated between the electrodes 114. Discharge occurs, and a light flux is emitted from the light emitting unit 111.
Note that the lead wires 200 and 210 are made of a metal such as nickel or gold, or an alloy thereof, and may be a wire member having rigidity as a wire and capable of maintaining the shape of the bent portion, for example. The base 117 is a member that protects the second sealing portion 113 and may be omitted if not necessary. The lead wire 118 drawn from the tip of the second sealing portion 113 can be set long and used as it is as the lead wire 210. As the clasp 116, a ring sleeve, a crimp terminal, or the like can be employed.
In addition, a heating wire 119 is wound around the light emitting portion 111 of the second sealing portion 113 so as to cause a current to flow when the projector 1 is started and induce a discharge between the electrodes 114. It is welded to a clasp 116 at the tip of one sealing portion 112. Since the halogen cycle occurs early due to the preheating effect of the light emitting unit 111 by the heating wire 119, the light source lamp 11 can be turned on quickly.

The elliptical reflector 12 is integrated with quartz glass, sapphire glass, quartz, fluorite, YAG (Yttrium Aluminum Garnet, Y3Al5O12), etc., provided with a neck portion 121 and a spheroidal curved reflecting portion 122 extending from the neck portion 121. It is a molded product.
An insertion hole 123 in which the second sealing portion 113 is disposed is formed in the neck portion 121 at the center.
A reflection surface 124 is formed on the surface of the reflection portion 122 by forming a dielectric multilayer film. The reflection surface 124 is a cold mirror that reflects visible light and transmits infrared rays and ultraviolet rays. . In terms of heat resistance, it is preferable to form the reflective surface 124 by metal thin film deposition, for example, by alternately stacking tantalum compounds and SiO ₂ or alternately stacking hafnium compounds and SiO ₂ .

When fixing the light source lamp 11 to the elliptical reflector 12, the second sealing portion 113 is inserted into the insertion hole 123 of the elliptical reflector 12, and the light emission center between the electrodes 114 in the light emitting portion 111 is the elliptical shape of the reflecting surface 124. The light source lamp 11 is disposed so as to be positioned at the first focal point F1 of the curved surface, and the insertion hole 123 is filled with an inorganic adhesive mainly composed of silica / alumina.
Note that the dimension of the reflector 122 in the direction of the illumination optical axis A is shorter than the length of the light source lamp 11, and when the light source lamp 11 is fixed to the elliptical reflector 12 as described above, The first sealing portion 112 (one sealing portion) protrudes from the opening end portion 125.

  The sub-reflecting mirror 13 is a reflecting member that covers substantially the front half of the light emitting unit 111 of the light source lamp 11 and is disposed to face the reflecting surface 124 of the elliptical reflector 12, and the reflecting surface 131 is formed on the spherical surface of the light emitting unit 111. It is formed in the shape of a concave curved surface. The sub-reflecting mirror 13 is manufactured using, for example, quartz or neo-ceram which is a low thermal expansion material, translucent alumina, sapphire, quartz, fluorite, YAG (Yttrium Aluminum Garnet, Y3Al5O12) which is a high thermal conductivity material. ing. Further, like the elliptical reflector 12, the reflecting surface 131 is a dielectric multilayer film that reflects only visible light and transmits infrared rays and ultraviolet rays.

The collimating concave lens 14 is a member that collimates the light beam emitted from the light source lamp 11 and reflected in a predetermined direction by the elliptical reflector 12, and the light beam incident surface 141 is formed in an aspherical surface, for example, a concave surface of a hyperboloid. The light beam exit surface 142 is formed in a flat shape.
An antireflection film (AR coating / Anti Reflection Coating) is formed on the light incident surface 141, and an ultraviolet cut film is formed on the light emitting surface 142. Thereby, the improvement of the light utilization efficiency and the prevention of deterioration due to the ultraviolet rays of the optical components and the like arranged at the subsequent stage of the light source lamp unit 10 are achieved.

The holding member 16 has a cylindrical shape corresponding to the opening end 125 of the elliptical reflector 12, holds the outer peripheral end of the parallelizing concave lens 14 on the opposite side of the elliptical reflector 12, and covers the opening of the elliptical reflector 12. In addition, when the light source lamp 11 is ruptured, scattering of glass pieces and the like is prevented.
The holding member 16 has a double structure of a holding member main body 163 provided on the outer side and an absorbing member 164 provided on the inner side.
The outer holding member main body 163 is a synthetic resin injection-molded product such as polyphenylene sulfide (PPS) or Vectra (LCP), and includes an integrally formed cylindrical portion 161 and holding portion 162. The cylindrical portion 161 has a cylindrical shape corresponding to the opening end portion 125 of the elliptical reflector 12 and covers the light source lamp 11. The holding portion 162 is provided so as to close the end surface on the light emission side of the cylindrical portion 161, and an opening 162A into which the parallelizing concave lens 14 is fitted is formed.

On the other hand, as the inner absorbing member 164, various members that can block the light from the light source lamp 11 to the holding member main body 163 and can absorb light with low reflectance. In order to keep the reflectance low while having light-shielding properties, for example, a metal plate such as aluminum, magnesium, titanium, iron, copper, or an alloy thereof is used as a substrate, and the surface on the inner surface side is subjected to black alumite treatment or corrosion. The surface can be roughened by processing, etching, or the like.
The reflectance of the solid aluminum substrate is about 80%, but the black alumite treatment suppresses the reflectance to about 20% or less, and the light beam incident on the absorbing member 164 is reliably absorbed and shielded.
The holding member main body 163 is protected by such corrosion resistance and light absorption action based on the black alumite treatment of the absorbing member 164, and it is possible to prevent thermal deterioration and generation of harmful gas such as siloxane.
In addition, since the heat resistance of the holding member 16 as a whole can be ensured by the absorbing member 164, choices of materials for the holding member main body 163 are widened, and weight reduction, cost reduction, and easy molding can be achieved.

  As shown in FIG. 2, the lamp housing 15 is an integrally molded product made of a synthetic resin having an L-shaped cross section, and includes a horizontal portion 151 and a vertical portion 152.

  The vertical part 152 is a part for positioning the elliptical reflector 12 in the optical axis direction. An opening 153 is formed in the vertical portion 152 along the light beam exit opening edge of the elliptical reflector 12, and the opening end 125 of the elliptical reflector 12 is mechanically pressed and bonded to the opening 153. It is fixed with agents. Further, the holding member 16 is also bonded and fixed to the vertical portion 152.

On the other hand, the horizontal portion 151 engages with the wall portion of the optical component casing 2 to conceal the light source lamp unit 10 in the optical component casing 2 to prevent light leakage. The horizontal portion 151 is provided with a terminal block 154 for electrically connecting the light source lamp 11 to an external power source. The terminal block 154 is connected to the lead wires 200 and 210 of the light source lamp 11. A pair of screw portions 154A and 154B is provided.
The horizontal portion 151 and the vertical portion 152 are formed with projections and recesses, and these projections and recesses engage with the recesses and projections formed in the optical component housing 2 respectively. Thus, the emission center between the electrodes 114 of the light source lamp 11 is arranged on the illumination optical axis A of the optical component housing 2.

Next, the light beam emitted from the light emitting unit 111 will be described with reference to FIG. 4 which is a side sectional view of the light source lamp unit 10. In FIG. 4, the heating wire 119 is not shown.
Of the light beams emitted from the light emission center O of the light emitting unit 111, the light beam L1 toward the elliptical reflector 12 is reflected by the reflecting surface 124 of the elliptical reflector 12 and emitted toward the second focal point F2.
Further, the light beam L2 emitted from the light emission center O of the light emitting unit 111 to the side opposite to the elliptical reflector 12 (front side of the light beam emission) is reflected to the elliptical reflector 12 side by the reflection surface 131 of the sub-reflecting mirror 13, and The light is reflected by the reflecting surface 124 of the elliptical reflector 12 and emitted from the elliptical reflector 12 so as to converge to the second focal point F2.

  As described above, by using the sub-reflecting mirror 13, the light beam emitted from the light emitting unit 111 to the side opposite to the elliptical reflector 12 (the light emission front side) is reflected so as to be incident on the reflection surface 124 of the elliptical reflector 12. Therefore, almost all the light beams radiated from the light emitting unit 111 converge at the position of the second focal point F2 of the elliptical reflector 12, and the light use efficiency can be greatly improved.

  As described above, since almost all the light flux emitted from the light emitting unit 111 can be converged and emitted to a certain position, a sufficient amount of light can be obtained even if the area of the reflecting surface 124 is small. Thus, the light source lamp unit 10 and the projector 1 can be miniaturized by reducing the size and opening diameter of the elliptical reflector 12 in the optical axis direction, and the layout in which the light source lamp unit 10 is incorporated in the projector 1 is facilitated.

Hereinafter, the shape and wiring mode of the lead wires 200 and 210 in the light source lamp unit 10 will be described.
As shown in FIG. 2, the lead wire 210 extending from the second sealing portion 113 via the base 117 extends from the neck portion 121 to the outside of the elliptical reflector 12 and is welded to the screw portion 154 </ b> B of the terminal block 154. ing.
On the other hand, the first sealing portion 112 protrudes from the opening of the elliptical reflector 12, and the opening of the elliptical reflector 12 is covered with the holding member 16, so that the lead extending from the first sealing portion 112 via the clasp 116. The line 200 is drawn to the outside of the elliptical reflector 12 through the opening end 125 of the elliptical reflector 12 and then welded to the threaded part 154 </ b> A of the terminal block 154.

Here, in the present embodiment, the lead wire 200 is repeatedly bent in an L shape from the clasp 116 at the tip of the first sealing portion 112 to the opening end portion 125 of the elliptical reflector 12, and a plurality of bent portions 220 are obtained. The feature is that the shape is maintained. Due to these bent portions 220, the lead wire 200 has a staircase shape in which the L shape continues from the tip of the first sealing portion 112 to the opening end portion 125.
Specifically, the L-shape of the bent portion 220 includes a portion extending substantially along the central axis of the light beam emitted from the elliptical reflector 12 and a direction perpendicular to the central axis of the light beam emitted from the elliptical reflector 12 (the elliptical reflector). And a portion extending substantially along the direction of the 12 opening surfaces). In the present embodiment, the number of the bent portions 220 having the L shape is three.
Note that one end side of the bent portion 220 in the vicinity of the open end portion 125 extends along the end surface of the open end portion 125 of the elliptical reflector 12, and further, the outer periphery of the elliptical reflector 12 at the outer peripheral side edge of the open end portion 125. It bends along the surface and extends to the terminal block 154. The lead wire 200 is held by the elliptical reflector 12 at the bent portion 230 on the outer peripheral side of the opening end portion 125.

FIG. 5 is a plan view of the elliptic reflector 12, the light source lamp 11 and the like shown from above in FIG.
When the inside of the reflection surface 124 of the elliptical reflector 122 is viewed along the illumination optical axis A from the front of the light beam emission of the elliptical reflector 12 (when the opening of the elliptical reflector 12 is viewed from the front), the shape of the lead wire 200 is a bent portion. The bent shape 220 does not appear, and is substantially linear from the first sealing portion 112 toward the opening end portion 125. In other words, when the reflecting surface 124 of the elliptical reflector 12 is represented by a cross section perpendicular to the illumination optical axis A, the reflecting surface 124 of the elliptical reflector 12 is represented by a circle centering on the light emitting portion 111, and the lead wire 200 is It extends along the radius of this circle. That is, in the virtual plane including the central axis of the light beam emitted from the elliptical reflector 12, the lead wire 200 has a bent portion 220 and is arranged so as to extend from the clasp 116 of the sealing portion 112 to the opening end portion 125. It is installed.

  Here, the lead wire 200 is disposed in a plane including the central axis of the light beam emitted from the elliptical reflector 12, and when viewed from the direction along the central axis of the light beam emitted from the elliptical reflector 12, the elliptical reflector is used. Since the optical path of the light beam emitted from the elliptical reflector 12 is linearly crossed with the shortest dimension according to the radius of 12, the light shielding amount by the lead wire 200 can be suppressed as much as possible. Therefore, a bright and clear projected image can be expected without reducing the light utilization efficiency by the lead wire 200.

Such a bent portion 220 is applied to the first sealing portion 112 when a force is applied to the lead wire 200 extending from the tip of the first sealing portion 112 to the opening end portion 125 of the elliptical reflector 12. The bent portion 220 is deformed so as not to be directly applied to the connecting portion between the 112 (clasp 116) and the lead wire 200, and becomes a buffer portion for the force applied in the expansion / contraction direction of the lead wire 200. It is formed to alleviate the load on the connecting portion between the tip and the lead wire 200.
For example, when the lead wire 200 expands and contracts, the lead wire 200, the elliptical reflector 12, the light source lamp 11, and the like may thermally expand due to the lighting of the light source lamp 11 when the projector 1 is used. At this time, since the linear expansion coefficients of the lead wire 200, the elliptical reflector 12, the light source lamp 11, and the like are different from each other, the lead wire 200 is pulled or conversely in the compression direction as a result of a change in the positional relationship. A force is applied, and the lead wire 200 itself tends to expand and contract.
Further, when the lead wire 200 is routed around the terminal block 154, the lead wire 200 may be pulled during the wiring of the lead wire 200, or on the contrary, a force may be applied in the compression direction, or an external force may be applied. Even when the lead wire 200 is applied, an external force acts in the direction of expansion and contraction of the lead wire 200, and the lead wire 200 may be pulled or slackened.

Here, the force acting in the expansion / contraction direction of the lead wire 200 is specifically the expansion force FC acting in a direction substantially along a straight line connecting the tip of the first sealing portion 112 and the opening end portion 125. That means.
When the expansion / contraction force FC is applied to the lead wire 200, each bent portion 220 is deformed in a direction to buffer the expansion / contraction force FC. Specifically, when the lead wire 200 is pulled, each bent portion 220 is deformed so that the bent portion is expanded, and conversely, when the lead wire 200 is contracted, each bent portion 220 is narrowed. It deforms as follows.
By such deformation of the bent portion 220, the stretching force FC is dispersed and buffered in the lead wire 200, and it is possible to avoid a load from being concentrated on a specific part of the lead wire 200.
Here, since this buffering action is apportioned by the plurality of bent portions 220, the load dispersibility in the lead wire 200 is excellent, and the buffering reactivity is good even when the stretching force FC is relatively small. .
By such a buffering action of the bent portion 220, the load on the welding point between the lead wire 200 at the tip of the first sealing portion 112 and the clasp 116 is relieved, so that the lead wire 200 is removed from the first sealing portion 112. It is possible to prevent the light source lamp 11 from being detached, and it is possible to prevent the light source lamp 11 from being damaged or broken. Thus, the reliability of the light source lamp unit 10 or the projector 1 is improved, and further, the lead wire 200 may be detached from the first sealing portion 112 or the light source lamp 11 may be damaged during the wiring work of the lead wire 200. Therefore, the work of incorporating the light source lamp unit 10 into the projector 1 is facilitated.
In addition, since the light beam emitted from the light emitting unit 111 is converged by the elliptical reflector 12 and emitted from the elliptical reflector 12, the size of the optical path traversed by the lead wire 200 can be shortened. Thereby, the amount of light shielded by the lead wire 200 can be suppressed as much as possible, and the light utilization efficiency can be improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the following description, the same reference numerals are given to the same configurations as those in the embodiment described above, and the description is omitted or simplified.
In the above-described embodiment, the lead wire 200 is drawn to the outside of the elliptical reflector 12 along the end surface of the open end 125 of the elliptical reflector 12.
In the present embodiment, the position and manner of pulling out the lead wire 200 from the elliptical reflector 12 are different from those in the above embodiment.

FIG. 6 shows a light source lamp unit 60 of the present embodiment.
In the present embodiment, a hole 122 </ b> A for inserting the lead wire 200 is formed in the vicinity of the opening end portion 125 of the elliptical reflector 12. The lead wire 200 extending from the first sealing portion 112 is bent in an L shape at each bent portion 220 and then bent toward the hole 122A before the opening end portion 125. The lead wire 200 is elliptical through the hole 122A. It is drawn out of the reflector 12. Although not shown, silicon rubber is filled with the lead wire 200 inserted into the hole 122A, and the lead wire 200 is held by the elliptical reflector 12 at the hole 122A.

In the present embodiment, when the lead wire 200 is wired, for example, when the lead wire 200 is pulled toward the terminal block 154, or when a force is applied in the compression direction, the lead wire 200 is formed at the hole 122A. By being held, the load is restricted from being transmitted to the inner part of the elliptical reflector 12 of the lead wire 200. That is, since the hole 122A can cope with a relatively large expansion / contraction force, the wiring work of the lead wire 200 is further facilitated.
Except for the point related to the hole 122A of the elliptic reflector 12 described above, the present embodiment has the same configuration as the first embodiment. Therefore, the present embodiment also has the same operation and the same as the first embodiment described above. There is an effect.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
In the present embodiment, the shape of the bent portion 220 of the lead wire 200 is different from that in each of the embodiments.
FIG. 7 is a side sectional view showing a portion of the light source lamp unit 70 of the present embodiment.
In the present embodiment, the lead wire 200 extends along a straight line connecting the first sealing portion 112 to the opening end portion 125 of the elliptical reflector 12, and bends in a substantially U shape at a substantially central portion of the straight line. A bent portion 240 is provided.
The bent portion 240 is bent substantially at a right angle with respect to the straight portion of the lead wire 200 that connects from the clasp 116 at the tip of the first sealing portion 112 to the opening end portion 125 of the elliptical reflector 12, and is folded back so as to return to the straight portion again. It has a U shape. That is, the bent portion 240 is bent in a direction in which the U-shaped straight line portion is substantially orthogonal and in a direction in which the U-shape protrudes outside the elliptical reflector 12.
Note that the shape of the bent portion 240 when viewed from the direction along the central axis of the light beam emitted from the elliptical reflector 12 is substantially the same as that of FIG. 5 described above, and the lead wire 200 is the first sealing portion 112. When viewed from the direction along the central axis of the light beam emitted from the elliptical reflector 12 from the tip to the opening end 125 of the elliptical reflector 12, it extends substantially linearly. That is, in the plane including the central axis of the light beam emitted from the elliptical reflector 12, the lead wire 200 has a bent portion 240 and is disposed so as to extend from the clasp 116 of the sealing portion 112 to the opening end portion 125. ing. Therefore, the amount of light shielded by the lead wire 200 is suppressed as much as possible, and the use efficiency of light by the lead wire 200 is prevented from being lowered.

The bent portion 240 of the present embodiment has an action of buffering the force acting in the direction in which the lead wire 200 expands and contracts, as already described for the bent portion 220 of each of the embodiments. Specifically, when the lead wire 200 is pulled, the U-shape of the bent portion 240 is deformed so that the inside is opened, and conversely, when the lead wire 200 is contracted, the U-shape of the bent portion 240 is closed inside. It deforms as follows. That is, the deformation force of the lead wire 200 is buffered by the deformation of the bent portion 240, and an unreasonable load is not applied to the welding point between the clasp 116 of the first sealing portion 112 and the lead wire 200.
Since the present embodiment has the same configuration as that of the first embodiment except for the shape of the bent portion 240 described above, the present embodiment also exhibits the same operations and effects as those of the first embodiment described above. be able to.

The present invention is not limited to the above-described embodiments, and includes the following improvements and modifications.
The shape, material, arrangement relationship and the like of the arc tube, the reflector, the lead wire, or the sub-reflecting mirror are not limited to the above embodiment.

  In the above embodiment, the elliptical reflector 12 is employed as the reflector, and the light beam converged at the position of the second focal point F2 is collimated by the collimating concave lens 14. However, the present invention is not limited to this configuration. For example, it is also possible to employ a convex lens that employs a reflector having a parabolic reflection surface and converges a light beam reflected by the reflector. The reflector can have any shape that can be a concave mirror.

Moreover, in each said embodiment, although the shape of the bending parts 220 and 240 was formed in L shape thru | or U shape, it is not restricted to this. For example, the bent portion may be bent in a wave shape, a V shape, a spiral shape, an arc shape, or a spiral shape, and the number of the bent portions is not limited. In short, the shape of the bent portion is an arbitrary shape that is positively bent, and is appropriately determined according to the shape of the reflector or arc tube, the wiring form of the lead wire, and the opening end portion of the reflector from the tip of the sealing portion In the meantime, it is sufficient that at least one bent portion having an arbitrary bent shape is formed.
Further, the direction in which the bent portion is bent is not limited to the above embodiments, and the X, Y, and Z directions or X, Y, and Z rotations with respect to the straight line connecting the sealing portion tip and the opening end of the reflector. The shape may be bent in any direction. However, as described above, when viewed from the front of the opening along the central axis of the light beam emitted from the elliptical reflector 12 so that the lead beam 200 does not shield the light beam emitted from the elliptical reflector 12, It is desirable that the lead wire 200 extends substantially linearly at the opening end 125.

Moreover, the lead wire of this invention should just have a bending part, and the shape of parts other than a bending part is not limited. In each of the above embodiments, the bent portion 230 on the outer peripheral side edge of the opening end portion 125 may not be provided.
Note that the heating wire 119 may not be used.

  The present invention can be applied not only to the front type projector 1 that performs projection from the direction of observing the screen as in each of the embodiments described above, but also to a rear type projector that performs projection from the back side of the viewing direction of the screen.

Although the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the embodiments described above without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  The light source device of the present invention can efficiently prevent the disconnection of the lead wire, the breakage of the arc tube, and the failure that are likely to occur when the thermal expansion, the handling of the lead wire, or an external force is applied. As a light source device, it is possible to facilitate the work of assembling the light source device and contribute to the reliability of the product.

FIG. 2 is a plan view schematically showing an optical system of the projector in the first embodiment of the present invention. The perspective view which shows the light source lamp unit in the said embodiment. The sectional side view which shows the light source lamp unit in the said embodiment. It is a sectional side view which shows the light source lamp unit in the said embodiment, and is a figure explaining the course of the light beam inject | emitted from a light emission part. The top view which shows the part of the light source lamp unit in the said embodiment. The perspective view which shows the light source lamp unit in 2nd Embodiment of this invention. The fragmentary sectional side view of the light source lamp unit in 3rd Embodiment of this invention. The sectional side view which shows the conventional light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Light source lamp unit (light source device), 11 ... Light source lamp (arc tube), 12 ... Elliptical reflector (reflector), 13 ... Sub-reflector, 111 ... -Light emitting part, 112 ... 1st sealing part (sealing part), 113 ... 2nd sealing part (sealing part), 114 ... Electrode, 124 ... Reflecting surface (reflection of a reflector) Surface), 125... Open end, 131... Reflective surface (reflective surface of the sub-reflector), 200, 210... Lead wire, 220, 240.

Claims (6)

Light emission having a light emitting part that emits a light beam through an electrode, a pair of sealing parts extending on both sides of the light emitting part, and a lead wire that connects the electrode and an external power source and extends from the tip of the sealing part. A light source device comprising: a tube; and a reflector having a concave reflecting surface that emits a light beam emitted from the arc tube in a predetermined direction and exits from the opening,
The arc tube is provided such that one of the pair of sealing portions protrudes in front of the light beam emission of the reflector,
The light source device according to claim 1, wherein the lead wire extending from the one sealing portion includes a buffer bending portion that is bent in the middle of extending from the one sealing portion to the opening end of the reflector. The light source device according to claim 1,
The lead wire having the bent portion is a substantially straight line from the one sealing portion to the opening end of the reflector when the opening of the reflector is viewed from the front along the central axis of the light beam emitted from the reflector. A light source device characterized by extending in a shape. The light source device according to claim 2,
The bent portion extends from the one sealing portion toward the light emitting portion substantially along the central axis of the light beam emitted from the reflector, and extends from the one sealing portion toward the light emitting portion. A light source device characterized by having a substantially L-shape that is formed by a portion that is bent at a substantially right angle from a portion and that extends along a direction substantially perpendicular to the central axis of a light beam emitted from the reflector. The light source device according to claim 2,
The bent portion is bent substantially in a direction intersecting with the substantially straight portion at a substantially straight portion of the lead wire extending from the front end of the one sealing portion to the opening end of the reflector, and is folded back so as to return to the substantially straight line again. A light source device having a U-shape. The light source device according to any one of claims 1 to 4,
The reflector is an elliptical reflector having a spheroidal reflecting surface,
A sub-reflecting mirror having a reflecting surface disposed opposite to the reflecting surface of the elliptical reflector;
The light source device, wherein the reflecting surface of the sub-reflecting mirror reflects the light beam emitted from the light emitting unit to the elliptical reflector. A projector that modulates a light beam emitted from a light source according to image information to form an optical image, and magnifies and projects the optical image,
A projector comprising the light source device according to any one of claims 1 to 5.

Images