JP2005070411A - Internal condensing light source lamp and projection device using internal condensing light source lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source realizing miniaturization while preventing the loss of emitted light and excellent in cooling efficiency. <P>SOLUTION: A translucent cylindrical member is used as an arc tube 13, and a cylindrical cavity in which a pair of electrode parts 11a is inserted and which forms a gas enclosing part 11b in which gas for accelerating light emission is enclosed is bored at a position proximate from the end face 13b of the member which is mirror finished in curved surface shape. A repeated reflection means 12 repeatedly reflecting light from the electrode parts 11a and light internally reflected on the end face 13b is provided on the side surface 13c of the arc tube 13, whereby illumination light 2 internally condensed, integrated and uniformized by the reflection means 12 is emitted from a transmission surface part 13a being a planar end face. The shape of the end face 13b in the curved surface shape is set to any of spherical shape, paraboloidal shape and hyperboloidal shape, and the reflection means 12 is set as a vapor deposited surface or a mirror having shape realizing repeated reflection. A fan for cooling is disposed at an optional position on the outer periphery part of the arc tube 13 proximate to the electrode parts 11a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an internal condensing light source lamp and a projection apparatus using the internal condensing light source lamp, and in particular, a light source including a function of integrating a light beam from a light source into light capable of uniformly irradiating an irradiation surface. The internal condensing type light source lamp composed of a lamp can be optimally applied as a light source used in an illumination optical system such as a projection device (projector).

  FIG. 4 is an optical system configuration diagram showing a basic configuration of a conventional projection apparatus (projector). In the projection apparatus 20 ′ shown in FIG. 4, 21 is a light source lamp, 22 is a reflecting mirror, 23 is a light emitting glass tube that houses the electrode portion 21a, 24 is a rod integrator, 25 is a relay lens, and 26 is a display element (for example, a liquid crystal element). ), 27 is a projection lens, and 28 is a screen. The outgoing light 1 emitted from the light source lamp 21 is reflected by the reflecting mirror 22 and condensed on the rod integrator 24. The outgoing light 1 guided to the rod integrator 24 is repeatedly reflected inside the rod integrator 24, thereby integrating it as a uniform illumination light 2 capable of uniformly irradiating the irradiated surface in the vicinity of the outlet 24 a of the rod integrator 24. Then, the image information that is emitted to the display element 26 through the relay lens 25 and is optically modulated by the display element 26 is projected onto the screen 28 as the projection light 3 through the projection lens 27.

  Here, 29 is a fan for cooling the light source lamp 21, and since the reflecting mirror 22 covers the outside of the light source lamp 21, the fan 29 affects the optical path of the emitted light 1 emitted from the light source lamp 21. Is provided at a position where there is little effect, that is, a position outside the reflecting mirror 22, cooling air is sent to the light source lamp 21 to forcibly cool the surface of the light source lamp 21.

Further, as a conventional technique for reducing the size of a light source device and a projection device, for example, a technology of Japanese Patent Application Laid-Open No. 11-142780 shown in Patent Document 1 “Light source device and projection display device” is known. That is, Patent Document 1 discloses a rod integrator that integrates and emits illumination light so that the illumination area of the display element can be illuminated uniformly. A technique is described in which the length direction of the rod integrator can be shortened by employing a partially tapered rod in which the side surface portion is partially tapered.
JP 11-142780 A

However, in the technique as described above, for example, as shown in the optical configuration diagram of FIG. 4, the light source lamp 21, the reflecting mirror 22, the light emitting glass tube 23, and the rod integrator 24 are each configured as separate optical components. Since the emitted light 1 emitted from the light source lamp 21 is reflected by the reflecting mirror 22 and condensed on the rod integrator 24, the following problems arise.
(1) In order to prevent the loss of the emitted light 1 emitted from the light source lamp 21, it is necessary to arrange the reflecting mirror 22 so as to cover the outside of the light source lamp 21, and a large space is required for the light source lamp 21. It is difficult to reduce the size of the light source. For example, when a conventional light source such as a metal halide lamp is applied to the projection apparatus 20 ′ as shown in FIG. 4, a light source is formed from the light source lamp 21, the reflecting mirror 22, and the light emitting glass tube 23. When the cooling structure for cooling is included, the light source part is about (1/5) of the projection device 20 ', making it difficult to reduce the size of the projection device.
(2) Even if the reflecting mirror 22 is arranged so as to cover the outside of the light source lamp 21, the reflected light 22 emitted from the light source lamp 21 is reflected in the reflecting mirror 22 like the directly emitted light 1 a shown in FIG. 4. Without going through, a light component that is directly emitted in a direction different from the direction toward the rod integrator 24 and is not condensed on the rod integrator 24 is generated, and a loss occurs in the emitted light 1 emitted from the light source lamp 21.
(3) When cooling the light source lamp 21 that is at a high temperature, a method of sending cooling air from a fan 29 disposed outside the reflecting mirror 22 should be used so as not to affect the optical path. On the other hand, since the reflecting mirror 22 covers the outside of the light source lamp 21, the distance from the fan 29 to the light source lamp 21 is long, and the reflecting mirror 22 impedes the flow of wind. For this reason, the cooling air volume that can reach the light source lamp 21 is reduced, and the cooling efficiency of the light source lamp 21 is deteriorated.

  The present invention has been made to solve such a problem, and it is possible to integrally form a light source lamp, a reflecting mirror, and an arc tube, and to integrate and emit into uniform light. By making it possible to construct a more integrated structure including the rod integrator, it is possible to reduce the light loss from the light source and to reduce the size of the light source. It is an object of the present invention to realize an internal condensing light source lamp and a projection apparatus to which the internal condensing light source lamp is applied, which makes it possible to provide a light source capable of performing the above.

The present invention comprises the following technical means in order to solve the problems as described above.
The first technical means includes an arc tube formed of a cylindrical light-transmitting member having one end surface having a curved surface shape and the other end surface having a planar shape, and the light emission A pair of electrode portions disposed as opposed to each other as a light source in a cavity that is formed in a member that forms a tube and is close to the end surface of the curved surface and in which a gas for promoting light emission is sealed. The curved end face of the arc tube includes a reflective surface that is mirror-finished so as to reflect the light from the light source on the inner surface, and the cylindrical side wall of the arc tube further includes The light from the light source and the light internally reflected by the reflecting surface are repeatedly reflected inside the arc tube, and can be emitted from the end face of the planar shape as integrated and uniform illumination light Equipped with reflective means The features.

  According to a second technical means, in the internally condensed light source lamp according to the first technical means, the end face of the curved shape of the arc tube having a mirror finish is spherical or parabolic or It is characterized by having a hyperboloid shape.

  According to a third technical means, in the internal condensing light source lamp according to the first or second technical means, the repetitive reflecting means provided on the cylindrical side wall of the arc tube repeatedly reflects. It is characterized in that it is formed by a deposition surface having a shape that can be reflected or a mirror that can be repeatedly reflected.

  A fourth technical means includes a cooling fan for cooling the heat from the electrode portion of the arc tube in the internally condensed light source lamp according to any one of the first to third technical means. It is possible to dispose at any position on the outer peripheral portion of the arc tube that can be close to the electrode portion.

  According to a fifth technical means, in the internally condensed light source lamp according to any one of the first to fourth technical means, heat from the light source is radiated by a refrigerant along an outer peripheral portion of the arc tube. A heat dissipating means is provided.

  According to a sixth technical means, in the projection apparatus that projects an image, the internal condensing light source lamp according to any one of the first to fifth technical means is provided as a light source used in the illumination optical system. Features.

  According to the internal condensing light source lamp according to the present invention constituted by the technical means as described above and the projection device to which the internal condensing light source lamp is applied, the mirror surface finish is used for the emitted light emitted from the light source lamp. The structure is confined in the arc tube by the curved end face of the arc tube that is applied to form a reflecting surface and the repetitive reflecting means provided on the side surface of the arc tube, so that the light component is diffused outside the arc tube. Therefore, it is possible to supply integrated and uniform irradiation light efficiently and in an optimum state.

  Furthermore, since the reflecting surface is formed by the curved end face of the arc tube with a mirror finish, it is possible to eliminate the need for a reflecting mirror that is disposed so as to cover the outside of the light source lamp as in the prior art. The large space occupied by the reflector can be deleted, the light source can be made smaller and lighter, and the light source lamp itself can be integrated with the same emitted light uniformity effect as a conventional rod integrator. By incorporating this, the arrangement space of the rod integrator, which has been conventionally arranged separately from the light source, can be reduced, and the illumination optical system can be reduced in size. Such an internal condensing type light source lamp is used as the light source of the illumination optical system of the projection apparatus. As a result, it becomes possible to save the space of the projection device, and contribute to the reduction in size and weight.

  Further, by eliminating the need for a reflecting mirror that is conventionally disposed so as to cover the outside of the light source lamp, the position of the cooling fan for cooling the light source can also be set in the direction of the exit surface that serves as the optical path of the emitted light. Rather, it can be arranged at the most appropriate position close to the light source to be cooled, the cooling effect can be improved, and the rotational speed of the cooling fan can be reduced. It is possible to provide a light source device and a projection device capable of reducing noise and reducing noise.

  The internal condensing type light source lamp according to the present invention comprises, as an arc tube, a cylindrical light-transmitting glass member having one end surface having a curved surface shape and the other end surface having a planar shape, and A pair of electrode portions disposed as opposed to each other as a light source in a cavity in which a gas for promoting light emission can be sealed at a position close to the end face of the curved surface in the glass member forming the arc tube And further includes a reflection means capable of repeatedly reflecting light from the direction of the light source into the inside of the arc tube on the cylindrical side wall of the arc tube. The curved end surface includes a reflecting surface that is mirror-finished so that the light from the light source is internally reflected, and the light from the light source and the light that is internally reflected by the reflecting surface are repeatedly reflected. Repeatedly reflected by Thus, the illumination light is integrated and made uniform, and is emitted from the end surface of the planar shape. The projection device according to the present invention includes a light source unit of the projection device. In addition, an internal condensing light source lamp as described above is applied.

  An example of an embodiment of an internal condensing light source lamp and a projection apparatus using the internal condensing light source lamp according to the present invention will be described below with reference to FIGS. FIG. 1 is a lamp configuration diagram showing an example of the configuration of an internal condensing type light source lamp according to the present invention, and FIG. 2 shows a part of the light source in the internal condensing type light source lamp according to the present invention shown in FIG. FIG. 2 is an enlarged view of an enlarged lamp, and shows that the internal condensing type light source lamp shown in FIG. 1 includes a reflecting surface on the outer end wall of the curved surface of the arc tube forming the light source part. FIG. 3 is an optical configuration diagram showing an example of a basic configuration of a projection apparatus (projector) using the internally condensed light source lamp according to the present invention as shown in FIG.

  First, the configuration of the internal condensing type light source lamp shown in FIG. 1 will be described in detail. In the internal condensing light source lamp 10 of FIG. 1, 11 is a light source, 11a is a pair of electrode portions forming the light source 11, 11b is a gas-sealed portion enclosing a light emission promoting gas that promotes light emission, and 13 is an internal light condensing device. A light-emitting tube forming the mold light source lamp 10, 12 is a repetitive reflecting means comprising a vapor deposition surface or a mirror that repeatedly reflects the light beam from the light source on the outer side wall of the light-emitting tube 13, and 13 a repeatedly reflects within the light-emitting tube 13 It is a transmission surface part for emitting the integrated and uniformed irradiation light.

  Here, the arc tube 13 is formed of a cylindrical member (glass) having translucency, and one end surface 13b of the member is either spherical, parabolic, or hyperboloid. A curved end surface having a shape is formed, and a pair of electrode portions 11a and 11a serving as a light source are disposed opposite to each other at a position close to the curved end surface 13b, and discharge of the electrode portions 11a and 11a is performed. A gas sealing portion 11b in which a light emission promoting gas for promoting light emission and a light emission is sealed is formed so as to accommodate a light emitting portion, that is, an electrode coil provided at the tip of the electrode portions 11a and 11a. Further, the curved end face 13b of the arc tube 13 is formed with a reflecting surface that is mirror-finished so that the light from the electrode portions 11a and 11a is internally reflected. The light emitted from 11a is reflected by the curved end surface 13b to the inside of the arc tube 13, and is guided in the direction of the cylindrical side surface 13c of the arc tube 13.

The other end surface of the arc tube 13 facing the curved end surface 13b forms a transmission surface portion 13a for emitting light, and has a planar shape perpendicular to the principal axis direction of the emitted light. Thus, the light that is repeatedly reflected and integrated by the outer wall of the side surface 13c of the arc tube 13 is emitted as the illumination light 2 from the transmission surface portion 13a.
That is, on the outer wall of the cylindrical side surface 13 c of the arc tube 13, a vapor deposition surface having a shape capable of repeatedly reflecting the light emitted from the light source 11 to the inside of the arc tube 13 as the repetitive reflection means 12. Is formed, or a mirror that can be repeatedly reflected is provided, and is repeatedly guided by the reflection means 12 to the transmission surface portion 13a while being reflected repeatedly, and is made uniform. The light is integrated and emitted from the transmission surface portion 13a.

  As described above, the arc tube 13 is configured to operate as an optical component in which the light source lamp 21, the reflecting mirror 22, the light emitting glass tube 23, and the rod integrator 24 shown in FIG. The light emitted from the transmission surface portion 13a forming the exit of the arc tube 13 is similar to the illumination light 2 emitted from the prior art rod integrator 24 shown in FIG. It is emitted as integrated illumination light 2 that can irradiate the irradiated surface uniformly.

  More specifically, the light-emitting tube 13 has an effect of repeatedly reflecting on the outer wall of the cylindrical side surface 13c of the light-emitting tube 13 by the repetitive reflection means 12, and the light emitted from the electrode portion 11a and the curved surface shape. The reflected light that is internally reflected by the end face 13 b is repeatedly reflected by the reflecting means 12, so that it is internally condensed, integrated, and emitted from the transmission surface portion 13 a of the arc tube 13. As described above, the integrated light source including the light source 11, the repetitive reflection means 12, and the arc tube 13 is internally condensed and emits the integrated uniform illumination light 2 from the transmission surface portion 13a. It is formed as a concentrating light source lamp 10.

  Further, since the electrode portion 11a of the light source 11 generates heat, as shown in FIG. 3, the light source 11 does not interfere with the emission direction of the illumination light 2 from the transmission surface portion 13a in the outer peripheral portion of the arc tube 13. The cooling fan 19 is disposed at an arbitrary position on the outer peripheral portion of the arc tube 13 that can be close to the electrode portion 11a, and the cooling air is blown against the light source 11, so that the light source 11 is heated at a high temperature. Occurrence of a situation in which the member bursts or the member melts at a high temperature is prevented. That is, the light from the light source 11 can be confined by the repetitive reflection means 12 provided on the curved end face 13b and the cylindrical side face 13c of the arc tube 13, so that the conventional technique shown in FIG. Unlike the technology, it is not necessary to provide a large reflecting mirror 22 that covers the outside of the light source lamp 21, and the cooling fan 19 can be disposed close to the light source 11 to be cooled. Therefore, it is possible to reduce the rotational speed of the fan 19 and reduce the noise.

  Next, the configuration of a part of the internal condensing light source lamp 10 will be described in more detail using an enlarged view of the internal condensing light source lamp 10 shown in FIG. As described above, the arc tube 13 has one end surface 13b (the end surface in the left direction in FIG. 2) having a curved surface shape such as a spherical shape, a parabolic shape, or a hyperboloid shape, and the other end surface is a transmission. The surface portion 13a (an end surface (not shown in the right direction in FIG. 2)) is formed of a cylindrical glass member having a planar shape. In the glass member constituting the arc tube 13, two cylindrical cavities 10 a and 10 a that are perforated in a cylindrical shape in the upward and downward directions are provided at the end portions that are close to the curved end surface 13 b, and A spherical cavity 10b that is communicated with the two cylindrical cavities 10a and 10a and is perforated in a spherical shape is provided.

Here, the cylindrical cavities 10a and 10a drilled in the vertical direction are both in communication with the outside of the arc tube 13, and the electrode portions 11a and 11a serving as the light sources are sealed, and can be arranged opposite to each other. In addition, the electrode portions 11a and 11a can be connected to an external power source. In addition, the spherical cavity 10b is positioned so that the center position of the spherical cavity 10b is in the vicinity of the focal position of the end face 13b having a spherical shape, a paraboloid shape, or a hyperboloid shape, and a curved surface. A gas-filled portion 11b is formed in which a gas for promoting light emission for promoting discharge between the electrode coils 11a ₁ and 11a ₁ provided at the tips of the two electrode portions 11a and 11a and energizing light emission is sealed; A gas for promoting light emission is injected and sealed from either one of the cylindrical cavities 10a and 10a into the spherical cavity 10b, and air staying in the spherical cavity 10b is exhausted from the other of the cylindrical cavities 10a and 10a. Thereby, the gas for promoting light emission is filled in the spherical cavity 10b.

When the injection of the light emission promoting gas into the spherical cavity 10b is completed, the electrode portions 11a and 11a are inserted from both ends of the cylindrical cavities 10a and 10a, and the electrode coil 11a _{1 at} the tip of the two electrode portions 11a and 11a is inserted. , 11a ₁ are adjusted so as to be a predetermined distance d, and then sealed in the respective cylindrical cavities 10a, 10a.

Here, each of the electrode portions 11a, 11a, the electrode coil 11a _1, lead portion 11a _2, a metal foil conductor 11a _3, is composed of a mouthpiece 11a _4, the electrode coil _11a 1, 11a ₁ at the tip portion is discharged An electrode is formed and sealed in an appropriate state in the cylindrical cavities 10a and 10a by caps 11a ₄ and 11a ₄ connected to an external power source. As described above, the curved end surface 13b of the arc tube 13 is mirror-finished, and the light reflected by the electrode coils 11a ₁ and 11a ₁ forming the light source 11 is reflected to the inside of the arc tube 13. Forming a surface. Further, the light internally reflected by the end face 13b is guided to the right side of FIG. 2 while being repeatedly reflected on the outer wall of the side face 13c provided with the repetitive reflecting means 12 composed of a vapor deposition surface or a mirror. As shown in FIG. 1, the light is emitted as the irradiation light 2 from the transmission surface portion 13a at the position facing the end surface 13b.

  Next, the configuration of the projection apparatus 20 when the internal condensing light source lamp 10 shown in FIGS. 1 and 2 is applied will be described using the optical configuration diagram of the projection apparatus 20 shown in FIG. 10 is an internal condensing light source lamp according to the present invention, 15 is a relay lens, 16 is a display element, 17 is a projection lens, 18 is a screen, and 19 is a cooling fan. The basic operation of the projection apparatus 20 is the same as that of the prior art projection apparatus 20 'shown in FIG. 4, but, unlike the configuration of the prior art projection apparatus 20', the internal condensing of FIGS. As shown in the type light source lamp 10, the reflecting surface of the end face 13b that reflects the light from the electrode portion 11a and the rod integrator function that repeatedly integrates the light from the light source direction are integrated with the arc tube 13. As shown in FIG. 4, the reflecting mirror 22 disposed outside the light source lamp 21 is not necessary, and the rod integrator 24 is not required to be separated from the light source lamp 21 and disposed independently. Can be reduced in size and weight.

  Further, there is no restriction on the arrangement position of the fan 29 for cooling the light source lamp 21 as shown in FIG. 4, and the most efficient cooling with respect to the light source 11 as shown in the arrangement position of the fan 19 in FIG. It is possible to select and arrange a good position.

  In addition, since the light emitted from the light source 11 is reflected by the reflection means 12 arranged on the reflection surface of the end face 13b and the side wall 13c of the mirror finish, and is enclosed in the arc tube 13, A heat dissipating part for dissipating the heat generated from the light source 11 can be formed on the outer wall part of substantially the entire area of the transmission surface part 13a, the end face 13b, and the side face 13c of the arc tube 13 forming the outer peripheral part of the light source 11. . Further, by flowing a fluid as a refrigerant along the outer peripheral portion of the arc tube 13, for example, the outer wall of the side surface 13 c, the heat from the light source 11 is taken and cooled by the refrigerant, and then the refrigerant is circulated. It is possible to introduce a heat dissipating means that dissipates heat, and it is possible to further increase the cooling efficiency.

It is a lamp block diagram which shows an example of a structure of the internal condensing type | mold light source lamp which concerns on this invention. It is the lamp | ramp enlarged view which expanded a part of light source in the internal condensing type | mold light source lamp which concerns on this invention shown in FIG. It is an optical block diagram which shows an example of the basic composition of the projection apparatus (projector) using the internal condensing type | mold light source lamp which concerns on this invention. It is an optical system block diagram which shows the basic composition of the conventional projection apparatus (projector).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outgoing light, 1a ... Directly emitted light, 2 ... Illumination light, 3 ... Projection light, 10 ... Internal condensing type light source lamp, 10a ... Cylindrical cavity, 10b ... Spherical cavity, 11 ... Light source, 11a ... Electrode part, 11a ₁ ... electrode coil, 11a 2 _... lead portion 11a 3 _... metal foil conductors, 11a 4 _... die, 11b ... gas filling portion, 12 ... repeatedly reflecting means, 13 ... light-emitting tube, 13a ... transmission surface, 13b ... end surface, 13c DESCRIPTION OF SYMBOLS Side ... 15 ... Relay lens, 16 ... Display element, 17 ... Projection lens, 18 ... Screen, 19 ... Fan, 20, 20 '... Projection device, 21 ... Light source lamp, 21a ... Electrode part, 22 ... Reflector, 23 DESCRIPTION OF SYMBOLS ... Luminescent glass tube, 24 ... Rod integrator, 24a ... Outlet, 25 ... Relay lens, 26 ... Display element, 27 ... Projection lens, 28 ... Screen, 29 ... Fan.

Claims (6)

  An arc tube formed of a cylindrical light-transmitting member having one end surface having a curved surface shape and the other end surface having a planar shape, and in the member forming the arc tube A pair of electrode portions disposed as opposed to each other as a light source in a cavity that is perforated at a position close to the end surface of the curved surface and in which a gas for promoting light emission is sealed; The curved end surface includes a reflective surface that is mirror-finished so that light from the light source is reflected on the inner surface, and further, the light from the light source and the reflection are provided on a cylindrical side wall of the arc tube. It is provided with repetitive reflection means capable of repeatedly reflecting the light internally reflected by the surface to the inside of the arc tube and emitting it from the planar end face as integrated and uniform illumination light. Features inside Light-type light source lamp.   2. The internal condensing type light source lamp according to claim 1, wherein the shape of the curved end face of the arc tube having a mirror finish is a spherical shape, a parabolic shape, or a hyperboloid shape. An internal concentrating light source lamp.   The inner condensing type light source lamp according to claim 1 or 2, wherein the repeated reflecting means provided on the cylindrical side outer wall of the arc tube has a shape capable of being repeatedly reflected, Alternatively, the internal condensing type light source lamp is formed by a mirror capable of repeatedly reflecting.   The internal condensing type light source lamp according to any one of claims 1 to 3, wherein a cooling fan for cooling heat from the electrode portion of the arc tube is provided in the arc tube that is proximate to the electrode portion. An internal condensing type light source lamp characterized in that it can be disposed at an arbitrary position on the outer peripheral portion.   The internal condensing type light source lamp according to any one of claims 1 to 4, further comprising a heat radiating means for radiating heat from the light source by a refrigerant along an outer peripheral portion of the arc tube. Internal concentrating light source lamp.   6. A projection apparatus for projecting an image, comprising the internal condensing type light source lamp according to claim 1 as a light source used in an illumination optical system.

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