JP2007213860A - Light source device and projector - Google Patents

Abstract

A light source device and a projector capable of extending the service life are provided.
A light source device includes an arc tube having a discharge space, a light source lamp having a pair of electrodes disposed in the discharge space of the arc tube, and a light beam emitted from the light source lamp that is spread in a substantially concave shape in cross section. The main reflecting mirror 12 that reflects, the collimating concave lens 14 that is provided on the light emitting front side of the main reflecting mirror 12 and transmits the light beam, the light emitting front end of the main reflecting mirror 12, and the outer peripheral end of the collimating concave lens 14 And a supporting member 15 that connects the main reflecting mirror 12 and the collimating concave lens 14 to each other. The support member 15 is made of a material that transmits a light beam in the infrared region included in the unused light R <b> 3 off the main reflecting mirror 12 out of the light beam emitted from the light source lamp 11.
[Selection] Figure 5

Description

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

2. Description of the Related Art Conventionally, projectors that modulate a light beam emitted from a light source according to image information and project an enlarged optical image have been used.
As a light source device for such a projector, a discharge-type light source lamp such as a metal halide lamp or a high-pressure mercury lamp, a reflector that reflects a light beam emitted from the light source lamp, and a lamp housing that houses the light source lamp and the reflector inside (See, for example, Patent Document 1).

JP 2005-148293 A

  By the way, in the light source device described in Patent Document 1, the light beam directed toward the reflector among the light beams emitted from the light source lamp is reflected by the reflector and becomes use light that can be irradiated to the illumination target. In addition, the light beam emitted from the light source lamp and deviated from the reflector becomes unused light that cannot be irradiated to the illumination target. The unused light is irradiated onto the lamp housing, absorbed by the inner wall of the lamp housing, and converted into heat. For this reason, the temperature inside the light source device rises, and it becomes difficult to cool the light source device, and there is a problem that the life of the light source device cannot be extended.

  An object of the present invention is to provide a light source device and a projector capable of extending the life.

The light source device of the present invention reflects a luminous bulb having a discharge space, a light source lamp having a pair of electrodes disposed in the discharge space of the luminous tube, and a light beam radiated from the light source lamp, spreading in a substantially concave shape. A light source device including a reflector and a translucent member that is provided on the light emission front side of the reflector and transmits a light beam, the light emission front side end of the reflector, and an outer peripheral end of the light transmissible member And a support member that integrates the reflector and the translucent member, and the support member includes infrared light included in non-use light that is out of the reflector out of the light flux emitted from the light source lamp. It is made of a material that transmits the luminous flux in the region.
Here, as the reflector, either a parabolic reflector or an elliptical reflector may be adopted.
Further, the material of the support member may be any material as long as it transmits a light beam in the infrared region, and examples thereof include a glass material.
According to the present invention, since the light source device includes the support member, the unit in which the light source lamp and the reflector are integrated and the translucent member can be integrated, and the light source is supplied to the optical device on which the light source device is mounted. The layout incorporating the device is facilitated.
In addition, the space between the reflector and the translucent member can be made a substantially sealed space by the support member, and even when the light source lamp is ruptured, it is possible to prevent the fragments from scattering outside the light source device. it can.
In addition, since the support member is made of a material that transmits the infrared region, the infrared light beam included in the unused light that has come off the reflector out of the light beam emitted from the light source lamp is transmitted to the outside of the light source device. Can be discharged. For this reason, for example, if the support member is configured as a lamp housing, the unused light is not absorbed by the inner wall of the lamp housing or the like and converted into heat as in the conventional case, and the temperature inside the light source device is kept low. Accordingly, the deterioration of the support member (lamp housing) and the deterioration of the light source lamp can be suppressed, and the life of the light source device can be extended.

In the light source device of the present invention, it is preferable that a reflection surface is disposed opposite to the reflection surface of the reflector, and a sub-reflection mirror that reflects a part of the light beam emitted from the light source lamp toward the discharge space is provided. .
According to the present invention, since the light source device includes the sub-reflecting mirror, the light beam radiated from the light source lamp to the side opposite to the reflector is reflected by the sub-reflecting mirror toward the discharge space, and again to the reflector. Can be reflected. For this reason, the utilization efficiency of the light inject | emitted from a light source lamp can be improved. Further, since the light beam emitted from the light source lamp to the opposite side of the reflector can be reflected toward the discharge space by the sub-reflecting mirror, for example, compared with the case where no sub-reflecting mirror is provided, the optical axis of the reflector Directional dimensions and opening diameters can be reduced. That is, the light source device can be reduced in size.
By the way, the sub-reflecting mirror is preferably composed of a cold mirror that transmits infrared rays or ultraviolet rays in order to prevent the sub-reflecting mirror from being overheated by the irradiated light beam. In such a configuration, the support member is irradiated with unused light such as infrared rays or ultraviolet rays that have passed through the sub-reflecting mirror. Further, as described above, when the sub-reflecting mirror is provided, in order to reduce the size and the aperture diameter of the reflector in order to reduce the size of the light source device, a large amount of unused light that has passed through the sub-reflecting mirror. Become. Therefore, in the configuration in which the sub-reflecting mirror is provided in the light source device, by providing the support member that transmits the light flux in the infrared region, the above-described effect of maintaining the temperature inside the light source device low can be more suitably achieved.

In the light source device of the present invention, the support member has a cylindrical shape, an opening portion on one end side of the cylindrical shape is connected to a light emission front side end portion of the reflector, and an opening portion on the other end side of the cylindrical shape is the transparent portion. It is preferable to connect to the outer peripheral end of the optical member.
According to the present invention, since the support member has a cylindrical shape, the light emission front side end portion of the reflector is connected to the opening portion on one end side of the cylindrical shape of the support member, and the opening portion on the other end side of the cylindrical shape is connected. By connecting the outer peripheral end portions of the translucent member, the space between the reflector and the translucent member can be made a substantially sealed space by the support member. For this reason, even if the light source lamp ruptures while transmitting the infrared light flux contained in the non-use light through the support member and maintaining the temperature inside the light source device low, fragments are scattered outside the light source device. Can be effectively suppressed.

A projector according to the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. The light source device is a light source device as described above.
According to the present invention, since the projector includes the light source device described above, the projector can enjoy the same operations and effects as the light source device described above.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a plan view showing a schematic configuration of a projector 1 in the first embodiment.
The projector 1 is an optical device that modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the image light on a projection surface such as a screen. As shown in FIG. 1, the projector 1 is roughly composed of a substantially rectangular parallelepiped outer casing 2 and an optical unit 3 housed in the outer casing 2.
Although not shown in the drawings, in the exterior housing 2, in addition to the optical unit 3, a power supply unit that supplies external power to the constituent members of the projector 1, a cooling unit that cools the interior of the projector 1, and a projector It is assumed that a control device or the like for controlling the whole 1 is arranged.

The exterior housing 2 is a synthetic resin product by injection molding or the like, and configures the upper case, the front surface, the back surface, and the side surface of the projector 1, and the bottom surface, the front surface, the back surface, and the side surface of the projector 1, respectively. It consists of a lower case. Each case is fixed to each other with a screw or the like.
The exterior casing 2 is not limited to being made of synthetic resin, but may be formed of other materials, for example, metal.

  The optical unit 3 is disposed inside the exterior housing 2 and forms an image light to be enlarged and projected. As shown in FIG. 1, the optical unit 3 includes a light source device 10, a uniform illumination optical system 20, a color separation optical system 30, a relay optical system 35, an optical device 40, and a projection optical system 50 as a projection optical device. The optical elements and the optical device 40 constituting the optical systems 20 to 35 are positioned and adjusted and accommodated in an optical component casing 60 in which a predetermined illumination optical axis A is set.

The light source device 10 illuminates the optical device 40 by emitting light beams emitted from the light source lamp 11 in a certain direction. As will be described in detail later, the light source device 10 includes a light source lamp 11, a main reflecting mirror 12 as a reflector, a sub-reflecting mirror 13, a collimating concave lens 14 as a translucent member, and these as shown in FIG. The holding member 15 (refer FIG. 2 or FIG. 3) to hold | maintain is comprised. The light source device 10 is housed and disposed in an outer housing 10C (FIG. 1) connected to the optical component casing 60. The light source device 10 is housed and arranged in the outer housing 10C, so that a predetermined position with respect to the optical component housing 60 (the central axis of the light beam emitted from the light source device 10 and the illumination set in the optical component housing 60). Position at which the optical axis A coincides).
The light beam emitted from the light source lamp 11 is emitted as focused light by the main reflecting mirror 12 with the emission direction aligned in front of the light source device 10, collimated by the collimating concave lens 14, and applied to the uniform illumination optical system 20. It is injected.
FIG. 1 shows a case where the main reflecting mirror 12 is configured as an ellipsoidal reflector, and the collimating concave lens 14 is omitted when the main reflecting mirror 12 is configured as a parabolic reflector.

The uniform illumination optical system 20 is an optical system that divides the light beam emitted from the light source device 10 into a plurality of partial light beams and uniformizes the in-plane illuminance of the illumination area. The uniform illumination optical system 20 includes a first lens array 21, a second lens array 22, a polarization conversion element 23, and a superimposing lens 24.
The first lens array 21 has a function as a light beam splitting optical element that splits a light beam emitted from the light source device 10 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.
The second lens array 22 is an optical element that condenses a plurality of partial light beams divided by the first lens array 21 described above, and is matrixed in a plane orthogonal to the illumination optical axis A, like the first lens array 21. It has the structure provided with the several small lens arranged in a shape.

The polarization conversion element 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 substantially one direction.
Although not shown, the polarization conversion element 23 has a configuration in which polarization separation films and reflection films 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 reflection film and emitted in the emission direction of one polarized light beam, that is, the direction along the illumination optical axis A. Any of the emitted polarized light beams is polarized and converted by a phase difference plate provided on the light beam exit surface of the polarization conversion element 23, and the polarization directions of almost all the polarized light beams are aligned. By using such a polarization conversion element 23, it is possible to align the light beam emitted from the light source lamp 11 with a polarized light beam in substantially one direction, so that the utilization factor of the light source light used in the optical device 40 is improved. Can do.

  The superimposing lens 24 condenses a plurality of partial light beams that have passed through the first lens array 21, the second lens array 22, and the polarization conversion element 23, and superimposes them on image forming regions of three liquid crystal panels (to be described later) of the optical device 40. This is an optical element.

The color separation optical system 30 includes two dichroic mirrors 31 and 32 and a reflection mirror 33, and a plurality of partial light beams emitted from the uniform illumination optical system 20 by 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 in another wavelength region is formed on a substrate. The dichroic mirror 31 disposed in the front stage of the optical path is a mirror that reflects blue light and transmits other color light. Further, the dichroic mirror 32 disposed at the rear stage of the optical path is a mirror that reflects green light and transmits red light.

  The relay optical system 35 includes an incident side lens 36, a relay lens 38, and reflection mirrors 37 and 39, and guides red light transmitted through the dichroic mirrors 31 and 32 constituting the color separation optical system 30 to the optical device 40. It has a function. The reason why such a relay optical system 35 is provided in the optical path of the red light is that the length of the optical path of the red light is longer than the length of the optical path of the other color light, and thus the use of light due to light divergence or the like. This is to prevent a decrease in efficiency. In this embodiment, the length of the optical path of red light is long, and thus such a configuration is used. However, a configuration in which the length of the optical path of blue light is increased and the relay optical system 35 is used for the optical path of blue light is also considered. It is done.

  The blue 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 red light is condensed and bent by the lenses 36 and 38 and the reflection mirrors 37 and 39 constituting the relay optical system 35 and supplied to the optical device 40 via the field lens 41. In addition, the field lens 41 provided in the optical path upstream of each color light of the optical device 40 converts each partial light beam emitted from the second lens array 22 into a light beam parallel to the principal ray of each partial light beam. Is provided.

  The optical device 40 modulates an incident light beam according to image information to form a color image. The optical device 40 includes liquid crystal panels 42R, 42G, and 42B as light modulation devices to be illuminated (a liquid crystal panel on the red light side is 42R, a liquid crystal panel on the green light side is 42G, and a liquid crystal panel on the blue light side is 42B. And a cross dichroic prism 43. An incident-side polarizing plate 44 is interposed between the field lens 41 and the liquid crystal panels 42R, 42G, and 42B, and an emission-side polarized light is interposed between the liquid crystal panels 42R, 42G, and 42B and the cross dichroic prism 43. A plate 45 is interposed, and the incident-side polarizing plate 44, the liquid crystal panels 42R, 42G, and 42B, and the exit-side polarizing plate 45 modulate the light of each color light incident thereon.

The liquid crystal panels 42R, 42G, and 42B are obtained by hermetically enclosing a liquid crystal as an electro-optical material in a pair of transparent glass substrates. For example, a given image signal using a polysilicon TFT (Thin Film Transistor) as a switching element. Accordingly, the polarization direction of the polarized light beam emitted from the incident side polarizing plate 44 is modulated.
The cross dichroic prism 43 is an optical element that synthesizes an optical image modulated for each color light emitted from the emission side polarizing plate 45 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 the interface where the right angle prisms are bonded together. One of the substantially 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).

[Configuration of light source device]
2 and 3 are diagrams showing a schematic configuration of the light source device 10. Specifically, FIG. 2 is a perspective view of the light source device 10 as viewed from the light emission front side. FIG. 3 is an exploded perspective view of the light source device 10 as viewed from the light emission front side.
As illustrated in FIG. 2 or 3, the light source device 10 includes a light source device main body 10 </ b> A, a parallelizing concave lens 14, and a support member 15.

FIG. 4 is a cross-sectional view illustrating a schematic configuration of the light source device main body 10A.
As shown in FIGS. 2 to 4, the light source device main body 10 </ b> A has a configuration in which a light source lamp 11, a main reflecting mirror 12, and a sub-reflecting mirror 13 are integrated.
As shown in FIG. 4, the light source lamp 11 includes an arc tube 111 made of a quartz glass tube, a pair of electrodes 112 disposed in the arc tube 111, and an enclosure (not shown).
Here, as the light source lamp 11, various light source lamps that emit light with high luminance can be adopted, and for example, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be adopted.

The arc tube 111 includes a light emitting part 1111 that is located at the center and swells in a substantially spherical shape, and a pair of sealing parts 1112 and 1113 extending on both sides of the light emitting part 1111.
A substantially spherical discharge space is formed in the light emitting portion 1111, and a pair of electrodes 112, mercury, a rare gas, and a small amount of halogen are enclosed in the discharge space.
A molybdenum metal foil 112A electrically connected to the pair of electrodes 112 is inserted into the pair of sealing portions 1112 and 1113 and sealed with a glass material or the like. Each metal foil 112 </ b> A is further connected to a lead wire 113 as an electrode lead wire, and the lead wire 113 extends to the outside of the light source lamp 11.
When a voltage is applied to the lead wire 113, as shown in FIG. 4, a potential difference is generated between the electrodes 112 via the metal foil 112A, a discharge is generated, an arc image D is generated, and the inside of the light emitting unit 1111 emits light. . In the following description, the light emission center is described as the center position O of the arc image D generated between the electrodes 112. In addition, the center position O of the arc image D is located approximately at the center between the pair of electrodes 112. Furthermore, the center position O of the arc image D is the center axis of the arc tube 111 (coincided with the illumination optical axis A in FIG. 4) along the extending direction of the sealing portions 1112 and 1113, and the light emitting portion 1111 bulges most. It is assumed that it substantially coincides with the intersection (the center of the arc tube 111) with the cross section along the plane orthogonal to the illumination optical axis A of the portion that is present.

As shown in FIG. 4, the main reflecting mirror 12 includes a cylindrical neck portion 121 through which one sealing portion 1112 on the proximal end side of the light source lamp 11 is inserted, and a concave curved surface shape that extends from the neck portion 121. This is an integrally molded product made of glass having translucency and provided with a reflective portion 122.
As shown in FIG. 4, an insertion hole 123 is formed in the center of the neck 121 so as to be substantially cylindrical, and a sealing portion 1112 is disposed at the center of the insertion hole 123. .
The reflection unit 122 includes a reflection surface 122A configured by vapor-depositing a metal thin film on a glass surface having a rotational curve shape. The reflecting surface 122A is a cold mirror that reflects visible light and transmits infrared rays and ultraviolet rays.

In such a light source lamp 11 disposed inside the reflecting portion 122 of the main reflecting mirror 12, the center position O of the arc image D is in the vicinity of the first focal position F1 of the rotational curve shape of the reflecting surface 122A of the reflecting portion 122. Are arranged as follows.
When the light source lamp 11 is turned on, as shown in FIG. 4, among the light beams emitted from the light emitting unit 1111, the light beam R <b> 1 toward the main reflecting mirror 12 is reflected on the reflecting surface 122 </ b> A of the reflecting unit 122 of the main reflecting mirror 12. The reflected light is reflected to be focused at the second focal position F2 having a rotational curve shape.
Moreover, the light emission front side edge part in the reflection part 122 is extended to the outer side substantially orthogonal to the central axis (it corresponds with the illumination optical axis A in FIG. 4) of the arc tube 111, as shown in FIG. 2 or FIG. And has a rectangular frame shape in plan view.

As shown in FIG. 4, the sub-reflecting mirror 13 extends from the neck portion 131 and a substantially cylindrical neck portion 131 into which the other sealing portion 1113 constituting the arc tube 111 of the light source lamp 11 is inserted. A substantially spherical reflecting portion 132 is provided, and the neck portion 131 and the reflecting portion 132 are integrally formed.
The neck portion 131 is a portion for fixing the sub-reflecting mirror 13 to the light source lamp 11. By inserting the sealing portion 1113 of the light source lamp 11 into the cylindrical insertion hole 131A, as shown in FIG. A sub-reflecting mirror 13 is installed for the light source lamp 11. The inner peripheral surface of the insertion hole 131A is an adhesive surface filled with an adhesive for fixing to the sealing portion 1113. Thus, by providing the neck portion 131 in the sub-reflecting mirror 13, the fixing region of the sub-reflecting mirror 13 with respect to the light source lamp 11 can be increased as compared with the configuration in which the neck portion 131 is not provided. The adhering state of the sub-reflecting mirror 13 to the lamp 11 can be favorably maintained.

As shown in FIG. 4, the reflecting portion 132 is a reflecting member that covers substantially the front half of the light emitting portion 1111 of the light source lamp 11 in a state where the sub-reflecting mirror 13 is installed on the light source lamp 11, and is configured in a bowl shape. Has been.
The reflecting portion 132 is a reflecting surface 132 </ b> A that has an inner surface formed in a spherical shape that follows the spherical surface of the light emitting portion 1111 of the light source lamp 11. The reflecting surface 132A is a cold mirror that reflects visible light and transmits infrared rays and ultraviolet rays, like the reflecting surface 122A of the main reflecting mirror 12.
The sub-reflecting mirror 13 described above is composed of an inorganic material such as quartz or alumina ceramic, which is a low thermal expansion material and / or a high thermal conductivity material.

  Then, by attaching the above-described sub-reflecting mirror 13 to the arc tube 111, as shown in FIG. 4, the luminous flux radiated from the light emitting unit 1111 is radiated to the side opposite to the main reflecting mirror 12 (front side). Similar to the light beam R1 directly incident on the reflecting surface 122A of the main reflecting mirror 12 from the light source lamp 11, the light beam R2 is focused on the second focal position F2.

FIG. 5 is a cross-sectional view of the light source device 10 as viewed from the side.
As shown in FIG. 2, FIG. 3, or FIG. 5, the support member 15 is a member that integrates the light source device body 10 </ b> A and the parallelizing concave lens 14. More specifically, as shown in FIG. 2, FIG. 3, or FIG. 5, the support member 15 has a cylindrical shape whose inner diameter is reduced toward the light emission front side. The opening portion 151 is connected to the light emission front side end portion of the main reflecting mirror 12 constituting the light source device main body 10 </ b> A, and the cylindrical other end side opening portion 152 is connected to the outer peripheral end portion of the parallelizing concave lens 14.
Here, the opening portion 151 has a substantially rectangular shape in plan view, and is configured to be able to fit the light emission front side end portion of the main reflecting mirror 12. That is, the support member 15 and the main reflecting mirror 12 are connected by fitting the light emission front side end portion of the main reflecting mirror 12 into the opening portion 151.
The opening 152 has a circular shape in plan view, and is configured to be fitted with the collimating concave lens 14. In other words, the collimating concave lens 14 is fitted into the opening 152 so that the support member 15 and the collimating concave lens 14 are connected.
As described above, after the main reflecting mirror 12 and the collimating concave lens 14 are fitted to the respective opening portions 151 and 152, for example, they may be bonded and fixed with a fixing adhesive or the like.

Further, as shown in FIG. 2 or 3, the side surface of the support member 15 is opposed to the left-right direction (the horizontal direction substantially orthogonal to the extending direction of the arc tube 111), and air is introduced into the support member 15. Openings 153 and 154 having a rectangular shape in plan view that can be circulated are formed.
Then, cooling air is introduced into the support member 15 through one of the openings 153 and 154 by a cooling fan or the like constituting the cooling unit. By introducing the cooling air into the support member 15, the cooling air is blown to the light source lamp 11 of the light source device main body 10A to be cooled. In addition, air in the support member 15 is sucked through the opening by an exhaust fan or the like that constitutes the cooling unit disposed in the vicinity of the other opening of the openings 153 and 154, and the outside of the projector 1. And exhausted.

The support member 15 described above is made of a material that transmits a light beam in the infrared region. The material of the support member 15 is preferably a material having a relatively high heat resistant temperature (for example, 300 ° C. or more) and a relatively small coefficient of thermal expansion (for example, 40 × 10 ⁻⁷ / ° C. or less). Examples thereof include silicate glass, high silicate glass, quartz glass, and crystallized glass.
Examples of the borosilicate glass include Pyrex (registered trademark) and Tempax (trade name).
As high-silicate glass, borosilicate glass (Na ₂ OB ₂ O ₂ —SiO ₂ ) is heated to 600 ° C. to cause phase separation, and after the two phases of Na ₂ OB ₂ O ₂ and SiO ₂ are separated. An entangled state is created, and Na ₂ OB ₂ O ₂ therein is dissolved in concentrated hydrochloric acid to produce a glass composed of SiO _{2 having} a purity of about 96%, and a glass obtained by heating the glass includes, for example, Bicall (product name).
An example of crystallized glass is Neoceram (trade name).
Especially, since Pyrex (registered trademark) is inexpensive, it is preferable to use it.

That is, as shown in FIG. 5, the support member 15 integrates the light source device main body 10 </ b> A and the collimating concave lens 14, and out of the luminous flux emitted from the light source lamp 11, the unused light R < In the present embodiment, since the sub-reflecting mirror 13 is provided, the luminous flux in the infrared region included in the infrared or ultraviolet non-use light transmitted through the sub-reflecting mirror 13 is transmitted and discharged to the outside of the support member 15.
Although not specifically shown, members disposed outside the light source device 10, for example, the outer housing 10 </ b> C and the exterior housing 2, appropriately absorb an infrared light beam and convert it into heat. Is arranged. Then, the infrared light flux transmitted through the support member 15 is absorbed by the absorbing member. As this absorbing member, for example, a member such as ceramics or aluminum subjected to alumite treatment can be employed.

The first embodiment described above has the following effects.
Since the light source device 10 includes the support member 15, the light source device main body 10 </ b> A and the collimating concave lens 14 can be integrated, and the layout in which the light source device 10 is incorporated in the projector 1 is facilitated.
Further, since the support member 15 is made of a material that transmits the infrared region (a glass material such as Pyrex (registered trademark) that has high heat resistance and a low thermal expansion coefficient), the light beam emitted from the light source lamp 11 A light beam in the infrared region included in the unused light R <b> 3 that is off the main reflecting mirror 12 can be transmitted and discharged to the outside of the light source device 10. For this reason, the unused light R3 is not absorbed by the inner wall of the lamp housing or the like and converted into heat as in the conventional case, the temperature inside the light source device 10 can be kept low, and the support member 15 is deteriorated. In addition, the deterioration of the light source lamp 11 can be suppressed and the life of the light source device 10 can be extended.

Furthermore, since the openings 153 and 154 are formed in the support member 15, air can be circulated inside the support member 15 through the openings 153 and 154, and the infrared light flux is transmitted. In addition to the effect of configuring the support member 15 with a material, the temperature inside the light source device 10 can be kept lower.
Furthermore, since the life of the light source device 10 can be extended, it is not necessary to replace the light source lamp 11 and the support member 15 in a short period of time, and industrial waste can be reduced.
Further, since the temperature inside the light source device 10 can be kept low, the amount of air circulated inside the support member 15 through the openings 153 and 154 by the cooling fan constituting the cooling unit can be reduced. That is, the number of rotations of the cooling fan can be reduced, and the noise of the projector 1 can be reduced. In addition, the voltage applied to the cooling fan can be set low, and power saving of the projector 1 can be achieved.

  Further, since the light source device 10 includes the sub-reflecting mirror 13, a light beam radiated from the light source lamp 11 to the side opposite to the main reflecting mirror 12 is applied to the reflecting surface 122 A of the main reflecting mirror 12 by the sub-reflecting mirror 13. It can be reflected backwards so as to be incident. For this reason, the optical axis direction dimension and the aperture diameter of the main reflecting mirror 12 can be reduced as compared with, for example, the case where the sub-reflecting mirror 13 is not provided. That is, the light source device 10 and the projector 1 can be reduced in size without reducing the light utilization efficiency, and the layout in which the light source device 10 is incorporated in the projector 1 is facilitated.

  Incidentally, as described above, when the sub-reflecting mirror 13 is provided, the sub-reflecting mirror 13 is transmitted to reduce the size and the aperture diameter of the main reflecting mirror 12 in order to reduce the size of the light source device 10. The unused light R3 thus increased. Therefore, in the configuration in which the sub-reflecting mirror 13 is provided in the light source device 10, the above-described effect that the temperature inside the light source device 10 can be kept low by providing the support member 15 that transmits the light flux in the infrared region. This is possible.

  Further, since the support member 15 has a cylindrical shape, the end portion on the light emission front side of the main reflecting mirror 12 is connected to the opening portion 151 on one end side of the cylindrical shape of the support member 15, and the opening on the other end side of the cylindrical shape. By connecting the outer peripheral end of the collimating concave lens 14 to the portion 152, the space between the light source device main body 10A and the collimating concave lens 14 can be made a substantially sealed space by the support member 15. For this reason, even if the light source lamp 11 is ruptured while the infrared light beam included in the non-use light R3 is transmitted through the support member 15 and the temperature inside the light source device 10 is kept low, the fragments are the light source. It is possible to effectively suppress scattering outside the device 10.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
6 and 7 are diagrams illustrating a schematic configuration of the light source device 100 according to the second embodiment. Specifically, FIG. 6 is a perspective view of the light source device 100 as viewed from the light emission front side. FIG. 7 is an exploded perspective view of the light source device 100 as viewed from the light emission front side.
In the first embodiment, the support member 15 constituting the light source device 10 is formed with two openings 153 and 154 so that air can flow through the openings 153 and 154.
On the other hand, in 2nd Embodiment, as shown in FIG. 6 or FIG. 7, the support member 150 which comprises the light source device 100 is the structure by which each opening part 153,154 was abbreviate | omitted. That is, the inside of the support member 150 is a sealed space because the opening portion 151 on one end side of the cylindrical shape is closed by the light source device main body 10A and the opening portion 152 on the other end side of the cylindrical shape is closed by the parallelizing concave lens 14. Yes. The configuration of the support member 150 is the same as that of the first embodiment except that each opening is omitted.

According to the second embodiment described above, even when the inside of the support member 150 is a sealed space, substantially the same effects as those of the first embodiment can be enjoyed. In addition, the following effects are obtained.
By the way, when air is introduced into the support member 15 and cooling air is blown to the light source lamp 11, there may be a local low temperature portion in the arc tube 111. Thus, when a relatively large deviation occurs in the temperature distribution of the arc tube 111, blackening or the like is likely to occur on the tube wall of the arc tube 111, and the brightness of the light source device decreases or the arc tube 111 bursts. Will cause.
In the present embodiment, the inside of the support member 150 is a sealed space, and since cooling air is not blown to the light source lamp 11, a relatively large deviation in the temperature distribution of the arc tube 111 hardly occurs as described above. A decrease in brightness of the light source device 100 and a burst of the arc tube 111 can be suppressed. Further, even when the light source lamp 11 is ruptured, it is possible to further suppress the fragments from being scattered outside the light source device 100 as compared to the first embodiment.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In each of the embodiments, the main reflecting mirror 12 is configured as an ellipsoidal reflector. However, the present invention is not limited thereto, and the main reflecting mirror 12 may be configured as a parabolic reflector that reflects the light beam emitted from the light source lamp 11 as substantially parallel light. . In this way, when the main reflector is configured as a parabolic reflector, for example, if a configuration in which a translucent member such as explosion-proof glass is arranged instead of the collimated concave lens 14, as in the above embodiment, Even when the light source lamp 11 is ruptured or the like, it is possible to avoid debris from being scattered outside the light source device 10.

In each of the embodiments described above, the light source devices 10 and 100 have been described with the configuration in which the sub-reflection mirror 13 is provided.
In the first embodiment, the support member 15 is configured in a cylindrical shape. However, as long as the light source device main body 10A and the parallelizing concave lens 14 can be integrated, the support member 15 is not limited to a single unit having a cylindrical shape. You may comprise.

In each of the above embodiments, only the example of the projector 1 using the three liquid crystal panels 42R, 42G, and 42B has been described. However, the present invention is a projector using only one liquid crystal panel and a projector using two liquid crystal panels. Alternatively, the invention can be applied to a projector using four or more liquid crystal panels.
In each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In each of the above embodiments, a liquid crystal panel is used as the light modulation device, but a light modulation device other than liquid crystal, such as a device using a micromirror, may be used. In this case, polarizing plates on the light beam incident side and the light beam emission side can be omitted.
In each of the above embodiments, only the example of a front type projector that projects from the direction of observing the screen has been described. However, the present invention also applies to a rear type projector that projects from the side opposite to the direction of observing the screen. Applicable.
In each of the above embodiments, the light source device of the present invention is employed in the projector. However, the present invention is not limited to this, and the light source device of the present invention may be employed in other optical devices.

Although the best configuration for carrying out the present invention has 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 above-described embodiments 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 is included in this invention.

  Since the light source device of the present invention can extend the life, it can be used as a light source device for a projector used in home theater or presentation.

FIG. 2 is a plan view illustrating a schematic configuration of the projector according to the first embodiment. The figure which shows schematic structure of the light source device in the said embodiment. The figure which shows schematic structure of the light source device in the said embodiment. Sectional drawing which shows schematic structure of the light source device main body in the said embodiment. Sectional drawing which looked at the light source device in the said embodiment from the side. The figure which shows schematic structure of the light source device in 2nd Embodiment. The figure which shows schematic structure of the light source device in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector 10,100 ... Light source device, 11 ... Light source lamp, 12 ... Reflector (main reflecting mirror), 13 ... Sub-reflecting mirror, 14 ... Parallelizing concave lens (transparent) Optical members) 15, 150... Support members, 42R, 42G, 42B... Liquid crystal panel (light modulation device), 50... Projection optical system (projection optical device), 111. ... Electrodes, 122A, 132A ... Reflecting surface, R3 ... Unused light.

Claims (4)

An arc tube having a discharge space, and a light source lamp having a pair of electrodes arranged in the discharge space of the arc tube, a reflector that extends in a substantially concave shape in cross section and reflects a light beam emitted from the light source lamp, and light of the reflector A light source device provided with a translucent member that is provided on an emission front side and transmits a light beam;
A light emitting front side end portion of the reflector, and a support member that is connected to an outer peripheral end portion of the translucent member and integrates the reflector and the translucent member;
The light source device according to claim 1, wherein the support member is made of a material that transmits a light beam in an infrared region included in an unused light beam that is out of the reflector among the light beam emitted from the light source lamp. The light source device according to claim 1,
A light source device, comprising: a sub-reflecting mirror having a reflecting surface disposed opposite to the reflecting surface of the reflector and reflecting a part of a light beam emitted from the light source lamp toward the discharge space. The light source device according to claim 1 or 2,
The support member has a cylindrical shape, an opening portion on one end side of the cylindrical shape is connected to a light emission front side end portion of the reflector, and an opening portion on the other end side of the cylindrical shape is an outer peripheral end portion of the translucent member. A light source device connected to the light source device. A projector comprising: a light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information; and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. ,
The projector according to claim 1, wherein the light source device is the light source device according to claim 1.

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