CN1871548A - Reflector, light source device, and projection type display unit - Google Patents

Abstract

A concave mirror substrate (1) constituting a reflector is formed of a large-thermal-conductivity base material such aluminum. An infrared heat conversion layer (2) is film-formed by anodic-oxidizing the base material such as aluminum to absorb a light in a wavelength region passing through a visible light reflection layer (4) and convert it into heat. A gloss buffer layer (3) is film-formed by firing at high temperatures Si-based resin or polyimide-based resin to the inner side (surface on a light source side) of the infrared heat conversion layer (2) to thereby buffer the infrared heat conversion layer (2) and the visible light reflection layer (4) so that the both do not touch directly, reduce the effect of unevenness produced in the infrared heat conversion layer (2), and smooth the surface on the light source side of the visible light reflection layer (4). Accordingly, light converted into heat is efficiently dissipated, stress/strain caused by differences in thermal coefficient among respective portions are eased to control performance deterioration, and costs, size and weight can be reduced.

Description

Reflector, light source device and projection display device

technical field

The present invention relates to a reflector for emitting light emitted from a light source to a desired direction, a light source device having the reflector, and a projection display apparatus including the light source device having the reflector.

Background technique

A conventional projection display device uses a metal halide lamp, a high-pressure mercury lamp, etc. as a high-intensity light source, and reflects light emitted from the light source in a desired direction using a reflector. Such a reflector is mainly composed of a concave mirror, which has a function of reflecting light from a light source in a desired direction.

Because metal halide or high pressure mercury lamps generate high heat, they must be forced to cool because the lamp itself will reach very high temperatures when in use. Specifically, if the lamp itself reaches a high temperature during use, the temperature of the lamp body and the concave mirror for reflecting light from the lamp in a desired direction will excessively rise, which causes various problems such as lamp life reduction, degradation of the reflective layer of the concave mirror, etc. This is the reason why the aforementioned high-intensity light source device inevitably requires a cooling system. The cooling system forcibly cools the light source device as a whole by arranging cooling fans around the light source device with the light source and reflector.

Generally, the mainstream of such projection display devices using high-intensity light source devices is the relatively large, fixed type. Recently, however, a small and lightweight type is required so as to be easy to carry. For this reason, small high-intensity light source devices for small projection display devices are also required.

In order to miniaturize the light source device, it is necessary not only to reduce the size of the lamp but also to miniaturize the concave mirror which is the main part of the reflector. However, since the concave mirror (reflector) also acts as a radiator of the light source, there arises a problem that if the size of the concave mirror is made small, the radiation performance of the light source itself decreases.

In order to solve this problem, the following configurations have been proposed, including: a device for installing a cooling fan for blowing cooling air from the arc tube side; for cooling the arc tube and the sealed tube portion with the blown cooling air and allowing A device for inserting air through the arc tube into the cylinder and cooling another sealed tube portion; and a device for discharging heat to the outside of the projection display device (for example, see Patent Document 1)

FIG. 6 shows a configuration diagram of the overall structure of a conventional reflector, light source device, and projection display device.

In this figure, a conventional projection display device includes: as essential components, a light source device 100 including a reflector; a rotating color wheel 101; a rod lens 102; a condenser lens 103; a TIR prism 104; a reflector 105; ; projection lens 107 (optical system for magnified projection); and forced cooling system 110 .

The light source device 100 includes a concave mirror substrate 1 c , a visible light reflection layer 4 , a light source 10 , an adhesive material 11 and a transparent explosion-proof glass 12 .

First, the structure and function of a conventional light source device are described.

In FIG. 5, a concave mirror substrate 1c of a conventional light source device 100 is formed of a base material such as aluminum. The visible light reflection layer 4 of the cold light mirror layer is formed on the inner side (light source side surface) of the concave mirror substrate 1c. The visible light reflection layer 4 has a function of allowing infrared rays radiated from the light source 10 to pass therethrough and selectively reflecting visible light. Here, the light source 10 consists of a multilayer interference coating of alternately deposited layers of titanium dioxide and silicon dioxide and is bonded to the concave mirror substrate 1 by means of an adhesive material 11 .

Next, the function of the conventional projection display device shown in FIG. 6 will be described.

The light emitted from the light source 10 is reflected by the visible light reflection layer 4 constituting a concave mirror, and passes through the rotating color wheel 101, and then generates R, G, and B lights in a time-division manner. Light passing through the color wheel 101 is diffused and shaped by a rod lens 102 , and passes through a condenser lens 103 , a TIR prism 104 and a mirror 105 , and then is projected onto a light modulator 106 . The light modulator 106 performs light modulation according to the color and image information of projected light. The light-modulated light is then projected onto a screen (not shown) using the magnifying projection optical system 107, so that a full-color image can be displayed.

Since enhancing the forced cooling system 110 implies an increase in the forced cooling system itself, this is contrary to the goal of reducing the size of the system. In addition, there is also the problem of cooling fan noise.

To this end, a device for enhancing cooling performance by improving the heat dissipation capability of the reflector itself has been disclosed. More specifically, a device for improving the heat dissipation capability of the reflector itself has been proposed (see, for example, Patent Document 2) by forming the visible light reflection layer 4 and the concave mirror substrate 1 by vapor phase evaporation from the following group Thin films of black oxides of selected elements: silicon, titanium, and chromium, as visible light reflectors (visible light reflective layer 4) absorb infrared rays radiated from lamps, and efficiently transfer the absorbed energy as heat to the concave mirror substrate 1 (metal or ceramic substrate).

Enhanced heat dissipation reflectors generally include: a specific wavelength range reflective device (visible light reflective layer) for reflecting specific wavelength range light; a light-to-heat conversion device ( a light-to-heat conversion layer containing black oxide, etc.); and a heat sink for radiating heat converted from light by the light-to-heat conversion device (a ceramic heat sink layer containing a metal such as aluminum, copper, iron, etc., silicon carbide, etc.), wherein The light-to-heat conversion device is located between the heat sink and the specific wavelength range reflection device, while the light-to-heat conversion device and the specific wavelength range reflection device are laminated in direct contact with each other.

Patent Document 1:

Japanese Patent Application Early Publication Hei 11-39934

Patent Document 2:

Japanese Patent Application Early Publication Sho 64-90401

Contents of the invention

Problem to be solved by the present invention

However, in the conventional reflector, light source device, and projection display device described in the background art above, because, for example, when using the aforementioned heat dissipation-enhancing type reflector, the heat generated by the light-to-heat conversion device is not only conducted to the heat dissipation device, but also to To the side of the specific wavelength range reflecting means, there arises a problem that the characteristics of the specific wavelength range reflecting means deteriorate due to thermal stress.

In addition, when the photothermal conversion device and the specific wavelength range reflection device are directly bonded to each other, there is a problem that stress/strain occurs at the bonding interface due to a difference in expansion coefficient, which causes the specific wavelength range reflection device to fall off or break.

Furthermore, in order to improve the light absorption efficiency of the photothermal conversion device, it is preferable to make the aforementioned surface rough by making unevenness on the surface of the photothermal conversion device on the light source side. However, in this case, since the surface of the wavelength-specific reflection device laminated on the photothermal conversion device loses smoothness, there arises a problem that the performance of the wavelength-specific reflection device deteriorates.

The present invention has been devised in view of the above-mentioned conventional problems, and it is therefore an object of the present invention to provide a reflector, a light source device, and a projection display device, using which, by efficiently discharging heat converted by light, and alleviating problems due to differences in expansion coefficients between parts The resulting thermal stress and strain can suppress performance deterioration, and can reduce cost, size, and weight.

means of solving problems

In order to solve the above problems, the reflector of the present invention includes: a heat sink made of a substrate in the shape of a concave mirror; a light-to-heat conversion component placed on the side of the light reflection surface of the heat sink for absorbing light in a predetermined wavelength range , and convert it into heat; a specific wavelength range reflective part that reflects light in a specific wavelength range onto the light-to-heat conversion part and allows light in the predetermined wavelength range to pass therethrough; and a buffer part located at The light-to-heat conversion component and the specific wavelength range reflective component are used for buffering, so that the light-to-heat conversion component and the specific wavelength range reflective component do not directly contact each other, and are used to allow light to pass through the specific wavelength range Light in a predetermined wavelength range of the wavelength range reflecting member passes therethrough.

The reflector is characterized in that the light-to-heat conversion component, the buffer component, and the specific wavelength range reflective component are laminated on the reflective surface of the heat sink in the above order, and are in surface contact with each other. combine together.

The feature of the reflector is that protrusions and grooves are formed on the joint interface where the light-to-heat conversion component and the heat dissipation device are combined.

The reflector is characterized in that convex grooves are formed on the surface of the light-to-heat conversion member on the buffer member side.

The reflector is characterized in that the heat sink is composed of a substrate with a thermal conductivity of 10 W/m·K or higher, and also provides the function of an infrared-to-heat conversion component.

The reflector is characterized in that the light-to-heat conversion member is formed by anodizing aluminum in an aqueous solution of chromic anhydride.

The reflector is characterized in that the cushioning member is a film formed on the light-absorbing surface side of the light-to-heat conversion member by firing a silicone resin or a polyimide resin at a high temperature.

The reflector is characterized in that fins are provided on the outer surface of the concave mirror-shaped base and formed integrally with the base.

A light source device according to the present invention includes one of the reflectors described above.

A projection display device according to the present invention includes the above-mentioned light source device.

Effect of the present invention

According to the present invention, the light-to-heat conversion device can absorb light in the wavelength range passing through the specific wavelength range reflection member and convert it into heat efficiently, and the provision of the buffer member brings about the following effects.

(1) It is possible to suppress the deformation of the heat sink due to the stress generated by the heat due to the difference in thermal expansion at the bonded interface between the light-to-heat conversion member and the reflection member for a specific wavelength range, thereby preventing the projected light from the light source from traveling in a straight line. Phenomenon.

(2) The influence of unevenness existing on the light-to-heat conversion member can be reduced, and the light source side surface of the reflection member for a specific wavelength range can be smoothed, thereby preventing the phenomenon that projected light from the light source does not propagate in a straight line.

Protrusions and grooves are provided at the bonding interface where the light-to-heat conversion component and the heat sink are combined, so that:

(1) improving the infrared absorption efficiency of the surface of the light-to-heat conversion component; and

(2) Diffuse infrared rays so that reflected infrared rays do not converge to a specific point.

In addition, providing protrusions and grooves on the buffer member side surface of the light-to-heat conversion member makes it possible to realize a reflector that:

(1) The light that cannot be absorbed but is reflected can be incident on the light-to-heat conversion component again; and

(2) Light that cannot be absorbed but is reflected can be prevented from converging on a specific point.

In addition, since the heat sink is composed of a base material with a thermal conductivity of 10 W/m·K so that it can serve as an infrared-to-heat conversion part, if the base material of the heat sink is formed of, for example, aluminum, the light source device having the reflector can be improved The overall heat dissipation performance can make the forced cooling system of the light source simple and compact, and realize the long life of the light source device.

Furthermore, the integration of heat sink fins on the outer surface of the concave mirror-shaped substrate makes it possible to improve the heat dissipation efficiency of the light source device to the surrounding air.

In addition, since a forced cooling system for a heat sink for forcibly cooling a reflector can be omitted, a projection display device that can reduce manufacturing costs and can be reduced in size and weight can be provided.

Description of drawings

FIG. 1 is a configuration diagram showing the overall structure of a light source device including a reflector according to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the inner surface temperature of a reflector with respect to the input power of a light source device including the reflector of the present invention and a light source device including a conventional reflector.

Fig. 3 is a configuration diagram showing a structure of a reflector according to a second embodiment of the present invention.

4 is a configuration diagram showing the overall structure of a light source device including a reflector according to a fourth embodiment of the present invention.

5 is a configuration diagram showing the overall structure of a projection display apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram showing the overall structure of a conventional reflector, a light source device, and a projection display device.

Label description:

1 Concave mirror base (heat sink)

2 Infrared to heat conversion layer (light-to-heat conversion component)

3 Gloss forming cushioning layer (cushioning part)

4 Visible light reflective layer (reflective part for specific wavelength range)

10 light sources

20 reflectors

30 light source device

11 Adhesive material

12 explosion-proof glass

101 color wheel

102 rod lens

103 condenser lens

104 TIR prisms

105 reflector

106 light modulator

107 projection lens

Detailed ways

Hereinafter, referring to the accompanying drawings, the best implementation modes of the reflector, light source device and projection display device of the present invention will be described in detail from the first to the fifth embodiments in sequence.

(first embodiment)

FIG. 1 is a configuration diagram showing the overall structure of a light source device including a reflector according to a first embodiment of the present invention. Here, the same components as those in the conventional reflector shown in FIG. 6 are denoted by the same reference numerals.

In the figure, a light source device 30a according to the first embodiment of the present invention includes a light source 10, a transparent explosion-proof glass 12, and a reflector 20a. The reflector 20a is composed of a concave mirror base (heat sink) 1, an infrared-to-heat conversion layer (light-to-heat conversion component) 2 laminated on the mirror side (light source side surface) of the concave mirror base 1, a glossy molding buffer layer (buffer layer) 3 and a visible light reflective layer (specific wavelength range reflective member) 4.

Next, detailed configurations and functions of the reflector and light source device according to the present embodiment will be described.

In FIG. 1, the reflector 20a of this embodiment is composed of a concave mirror substrate 1, an infrared-to-heat conversion layer 2, a gloss shaping buffer layer 3, and a visible light reflection layer 4, which are laminated in the order described above. The layers are bonded to each other in surface contact.

The concave mirror substrate 1 is composed of a base material such as aluminum, which has high thermal conductivity. The infrared-to-heat conversion layer 2 is a film formed on one layer of the concave mirror by anodizing a base made of aluminum or the like. The gloss forming buffer layer 3 is a film formed on the infrared-to-heat conversion layer 2 (on the light-absorbing surface side) by calcining a silicone resin or a polyimide resin at a high temperature. The infrared-to-heat conversion layer 2 absorbs light in the wavelength range passing through the visible light reflection layer 4 and converts it into heat with high efficiency.

The visible light reflection layer 4 is composed of a cold mirror layer formed on the gloss shaping buffer layer 3, and allows infrared rays to pass therethrough, and selectively reflects visible light.

The light source 10 consists of a multilayer interference coating of alternately deposited layers of titanium dioxide and silicon dioxide and is bonded to the concave mirror substrate 1 by means of an adhesive material 11 . As an example, the light source 10 may be configured as a high pressure mercury lamp with a power equal to 200W.

Here, the gloss shaping buffer layer 3 has a function of buffering the infrared-to-heat conversion layer 2 and the visible light reflection layer 4 so as not to be in direct contact with each other, and allowing light (infrared rays) in the wavelength range passing through the visible light reflection layer 4 to pass therethrough. . In addition, it also has the function of reducing the influence of unevenness generated on the infrared-to-heat conversion layer 2 and smoothing the light source side surface of the visible light reflection layer 4 .

If the gloss shaping buffer layer 3 does not exist, due to the difference in thermal expansion coefficient, stress occurs at the bonded interface between the infrared-to-heat conversion layer 2 and the visible light reflection layer 4 due to the generated heat, and the concave mirror substrate 1 is deformed, so that the heat from the light source A cast light of 10 will not travel in a straight line.

Next, an example of the reflector 20a according to the present embodiment will be described in detail.

The concave mirror substrate 1 can be formed using a high thermal conductivity substrate (hereinafter referred to as "high thermal conductivity reflector substrate") equal to or greater than 10 W/m·K. This allows the substrate to also function as an infrared-to-thermal conversion device. Generally, the thermal conductivity of aluminum is about 200 W/m·K, which is about 200 times that of borosilicate glass or polycrystalline glass (about 1 W/m·K) used for conventional light sources.

In addition, as a technique for forming a film (infrared-to-heat conversion layer 2 ) that efficiently converts infrared rays into heat, a technique for producing alumite has been known. In the present invention, a film of acid-resistant alumite chromate obtained by anodizing aluminum in an aqueous solution of chromic anhydride is produced. As a result, it is possible to obtain a crack-free coating that withstands high temperatures above 300 degrees Celsius from activation of a high-pressure mercury lamp, rapid temperature changes, and repeated fatigue.

Additionally, the aforementioned acid-resistant aluminum chromates formed on pure aluminum substrates generally appear opaque with off-white to gray hues. In the present invention, the substrate is reacted with an alloy such as Ni, Mg, etc. contained in a material suitable for die casting (ADC12, etc.), whereby a black tone can be produced. As a result, an emissivity indicating the degree of conversion of infrared rays into heat can be secured equal to 0.9 or higher (at 300 degrees Celsius), which is very close to that of a black body (emissivity 1.0).

In addition, when the visible light reflection layer 4 formed of a cold mirror layer that selectively transmits infrared rays emitted from the light source 10 and reflects visible light is a film formed by vapor phase evaporation or the like, visible light from the light source is efficiently reflected and collected (i.e., , by reducing scattered light) to the intended position is especially important. Therefore, the concave mirror surface of the concave mirror substrate 1 needs to have a glossy surface on the order of wavelength.

However, when an oxide film such as an acid-resistant aluminum chromate is selected as the infrared-to-heat conversion layer 2 in the present invention, it is necessary to provide a layer between this layer and the visible light reflection layer 4 to improve the glossiness to a specular level. membrane. With conventional examples, when light is reflected by a concave mirror, it is difficult to reflect light from a light source to a predetermined position due to too much scattered light.

In addition, in conventional light sources, the visible light reflection layer 4 is a film formed directly on the infrared-to-heat conversion layer 2 by vapor phase evaporation, and if a multilayer interference coating in which titanium dioxide layers and silicon dioxide layers are alternately deposited is formed, its The linear expansion rate is 3 to 5×10 ^-6 /degree Celsius, which is an order of magnitude different from that of aluminum (25×10 ^-6 /degree Celsius). If the gloss shaping buffer layer 3 is not provided and the two layers are directly bonded to each other, the stress and strain at the bonding interface due to the difference in expansion coefficient will cause the visible light reflective layer 4 to crack, fall off or break.

In the reflector of the present invention, by using the glossy molding buffer layer 3 formed between the infrared-to-heat conversion layer 2 and the visible light reflection layer 4 at a high temperature by firing a silicone resin or a polyimide resin as a buffer member, suppressing performance degradation due to stress and strain

Providing a gloss shaping buffer layer 3 as an integral part of the reflector of the present invention and using this layer as a base film for the formation of the visible light reflecting layer 4 in order to improve the gloss to a specular level makes it possible to obtain an extremely high emissivity of 0.9 or higher (which cannot be achieved in conventional examples), and extremely high reflectivity of about 30% or more than conventional methods. Here, the silicone resin developed this time has a linear expansion coefficient of 12×10 ^-6 /degree Celsius, which is an intermediate figure between the linear expansion coefficients of aluminum and the visible light reflection layer. Similarly, the same effect can be obtained using polyimide resin. However, depending on the mechanical toughness of the layer, the gloss shaping buffer layer 3 does not have to have an intermediate linear expansion rate. In the results of another test of the present invention, even if polyimide resin with a linear expansion coefficient of 40×10 ^-6 /degree Celsius was used, it exhibited the same function as the cushioning layer as long as it was highly extensible with 80% tensile ductility. Here, FIG. 2 is a graph showing the relationship between the inner surface temperature of the reflector with respect to the input power of the light source device including the reflector of the present invention and the light source device including the conventional reflector.

(second embodiment)

Fig. 3 is a configuration diagram showing a structure of a reflector according to a second embodiment of the present invention.

In the reflector 20a according to the first embodiment, the concave mirror substrate 1, the infrared-to-heat conversion layer 2, the gloss shaping buffer layer 3, and the visible light reflection layer 4 are bonded in surface contact with each other. In the reflector 20b according to the present embodiment, the bonding surfaces between the aforementioned layers are formed with protrusions and grooves, as shown in FIG. 3 .

More specifically, protrusions and grooves are first formed on the surface of the concave mirror substrate 1b between the concave mirror substrate 1b and the infrared-to-heat conversion layer 2b.

In addition, protrusions and grooves are formed on the surface of the infrared-to-heat conversion layer 2 b between the infrared-to-heat conversion layer 2 b and the gloss shaping buffer layer 3 .

Provide protrusions and grooves on the light source side surface of the concave mirror substrate 1b and the light source side surface of the infrared-to-heat conversion layer 2b,

(1) Make it possible to improve the infrared absorption efficiency at the surface of the infrared-to-heat conversion layer 2; and

(2) The infrared rays can be diffused by using these protrusions and grooves, so that the reflected infrared rays will not be concentrated on a specific point.

In addition, in this case, the gloss shaping buffer layer 3 can buffer the infrared-to-heat conversion layer 2b and the visible light reflection layer 4 so that they do not directly contact each other, reducing the protrusion formed on the infrared-to-heat conversion layer 2b and grooves, and smooth the light source side surface of the visible light reflection layer 4 .

(third embodiment)

The structure of the reflector according to the third embodiment of the present invention is the same as that according to the first embodiment or the second embodiment of the present invention, except for the components forming the infrared-to-heat conversion layer 2 and the gloss shaping buffer layer 3 and a part of the structure The method is different. Therefore, only the different points are described below.

The infrared-to-heat conversion layer 2 is formed by covering and firing ceramics on a concave mirror substrate 1 formed of aluminum. That is, this calcination modifies the interface between the concave mirror substrate 1 and the ceramic film, resulting in a metal oxide layer. The metal oxide layer has a function of converting infrared rays into heat.

The gloss shaping buffer layer 3 is formed by a ceramic film.

Next, the reason for forming the infrared-to-heat conversion layer 2 by the above method will be described.

In general, when an aluminum substrate on which a ceramic film is coated is calcined, the following reactions are observed.

(1) Oxygen in the air reaches the interface through the glass frit (ceramic coating particle) boundary, and oxidizes the surface of the aluminum substrate.

(2) The glass frit melts, wets and seals the oxidized aluminum layer, thereby making it possible to prevent further oxidation. On the other hand, hydrogen absorbed in the aluminum substrate diffuses to the interface and causes hydrogen reduction to produce fine aluminum particles in the oxidized aluminum layer.

(3) The molten coating melts the oxidized aluminum layer, while the cobalt oxide and nickel oxide present in the coating are reduced by tiny aluminum particles, and the dendritic crystals (dendrites) of Al-Co and Al-Ni are deposited at the interface superior. As a result, an electrochemical cell is formed between the Co and Ni deposited at the interface and the aluminum in the substrate, which corrodes the aluminum surface and roughens the interface, thus creating sufficient adhesion between the aluminum and glass layers.

(4) While the film reacts with the substrate at the substrate interface, the surface is smoothed by calcining.

The infrared-to-heat conversion layer 2 and gloss shaping buffer layer 3 thus filmed in the above reaction can exhibit the same effects as in the first embodiment, and obtain equivalent results for specific values of emissivity and reflectivity.

(fourth embodiment)

4 is a configuration diagram showing the overall structure of a light source device including a reflector according to a fourth embodiment of the present invention. The reflector 20c of this light source device 30c has almost the same configuration as the reflector 20a shown in the first embodiment, except that the heat sink 50 is integrally formed on the outer surface of the concave mirror substrate 1c. With this configuration, the heat transferred from the heat conversion layer 2 to the inner surface of the concave mirror substrate 1c is conducted to the tip of the heat sink 50 according to the thermal conductivity of the concave mirror substrate 1c. In the case of cooling, for example by natural convection, the heat radiated from the outer surface of a concave mirror can be calculated with the following formula:

Radiant heat Q

=Heat transfer coefficient h[W/m ² K]×Concave mirror outer surface area S[m ² ]×Temperature difference ΔT[K]

h＝2.51×C×(ΔT/L)0.25

Here, Q is the amount of heat dissipation [W], C is a coefficient determined according to the shape of the base of the concave mirror, ΔT is the temperature difference between the outer surface of the concave mirror and the surrounding air [K], and L is a coefficient determined according to the shape of the concave mirror .

Calculating the amount of heat dissipation based on the example,

·No heat sink:

2.51×0.52×((250-25)/0.05)0.25×0.009×(250-25)＝21.6[W]

·With heat sink:

2.51×0.45×((230-25)/0.05)0.25×0.027×(230-25)＝50.0[W]

As can be understood from the above, the provision of the heat sink 50 achieves double or higher radiation efficiency.

Although it is assumed that the structure of the reflector of this embodiment is the same as that of the first embodiment except for the concave mirror substrate, it may take the structure of the second or third embodiment.

(fifth embodiment)

5 is a configuration diagram showing the overall structure of a projection display apparatus according to a fifth embodiment of the present invention. Here, the same components as those in the conventional light source device are denoted by the same reference numerals.

In the figure, a projection display device according to a fifth embodiment of the present invention includes: as essential components, a light source device 30 including a reflector 20; a rotating color wheel 101; a rod lens 102; a condenser lens 103; a TIR prism 104; mirror 105; light modulator 106; and magnifying projection light system 107.

Here, it is assumed that the light source device 30 has the reflector 20 according to any one of the above-described first to fourth embodiments of the present invention.

Next, the functions of the projection display device according to the present embodiment shown in FIG. 5 will be described.

Light emitted from the light source 10 is reflected by a concave mirror, and passes through the rotating color wheel 101, and then generates R, G, and B lights in a time-division manner. Light passing through the color wheel 101 is diffused and shaped by a rod lens 102 , and passes through a condenser lens 103 , a TIR prism 104 and a mirror 105 , and then is projected onto a light modulator 106 . The light modulator 106 performs color modulation according to the color of projected light and image information. The light-modulated light is then projected onto a screen (not shown) using a projection lens 107 (enlargement projection optical system), so that a full-color image can be displayed.

The projection display device according to this embodiment shown in FIG. 5 is a color sequential projection display device. Because the heat dissipation capability of the light source device 30 is relatively high, and the reflection efficiency of the concave reflector is relatively high, compared with the projection display device using the conventional light source device 100 shown in FIG. 6 , this device has the following additional advantages.

(1) The forced cooling system 110 shown in FIG. 5 can be simplified or omitted.

(2) The distance from the light source device to other components can be reduced because the amount of infrared rays and visible light output from the light source device is low.

(3) Brightness can be improved by about 30% even for the same input power.

The first to fourth embodiments described above are described with reference to the case where aluminum is used as the reflector substrate (concave mirror substrate 1), a high-pressure mercury lamp is used as the light source 10, an acid-resistant aluminum with a metal oxide formed by a silicon coating Chromate is used as the infrared-to-heat conversion layer 2 , and silicone resin or polyimide resin with ceramics is used as the gloss forming buffer film 3 .

However, the reflector of the present invention can be configured using the following materials.

(1) For the concave mirror substrate 1, metals such as copper, iron, graphite, silicon, and other ceramics can be used as long as they have a thermal conductivity of 10 W/m·K or higher.

(2) For the light source 10, a metal halide lamp, a halogen lamp, a mercury lamp, a xenon lamp, or the like can be used.

(3) For the infrared-to-heat conversion layer 2, materials exhibiting high emissivity in the infrared range, such as other anodized aluminum, metal oxide coatings, etc. can be used.

(4) For the gloss forming buffer layer 3, materials that allow infrared rays to pass through and smooth the unevenness of the infrared to the heat conversion layer, such as Ni-Fe (nickel-iron) spinel pigment, fluorine coating, Teflon (registered trademark) film, PFA (polyvinyl fluoride) film, quartz glass film, etc.

In addition, the concave mirror substrate 1, the light source 10, the infrared-to-heat conversion layer 2, and the gloss shaping buffer layer 3 can use any materials, as long as they respectively satisfy the target functions, and should not be limited to those mentioned in each of the above-mentioned embodiments. those materials that arrived.

In addition, in each of the above-mentioned embodiments, the reflector substrate (concave mirror substrate 1) and the infrared-to-heat conversion layer 2 are composed of separate components, but in the present invention, the reflector substrate (concave mirror substrate 1) and the infrared The heat conversion layer 2 can be integrally formed using the same material.

Claims (10)

1. A reflector comprising: A heat sink consisting of a base in the shape of a concave mirror; A light-to-heat conversion component, placed on the side of the light-reflecting surface of the heat sink, is used to absorb light in a predetermined wavelength range and convert it into heat; a specific wavelength range reflective part that reflects light in a specific wavelength range onto the light-to-heat conversion part and allows light in the predetermined wavelength range to pass therethrough; and a buffer component, located between the light-to-heat conversion component and the specific wavelength range reflective component for buffering, so that the light-to-heat conversion component and the specific wavelength range reflective component do not directly contact each other, and used to allow transmission Light in a predetermined wavelength range passing through the specific wavelength range reflecting member passes therethrough. 2. The reflector according to claim 1, wherein the light-to-heat conversion component, the buffer component, and the specific wavelength range reflective component are laminated on the reflective surface of the heat sink in the above-mentioned order, and are separated from each other bonded together by surface contact. 3. The reflector according to claim 2, wherein protrusions and grooves are formed on the joint interface where the light-to-heat conversion component and the heat dissipation device are combined. 4. The reflector according to claim 2, wherein protrusions and grooves are formed on a surface of the light-to-heat conversion member on the buffer member side. 5. The reflector according to any one of claims 1 to 4, wherein the heat sink is composed of a substrate having a thermal conductivity of 10 W/m·K or higher, and also provides the function of an infrared-to-heat conversion component. 6. The reflector according to any one of claims 2 to 5, wherein the light-to-heat conversion member is formed by anodizing aluminum in an aqueous solution of chromic anhydride. 7. The reflector according to any one of claims 2 to 6, wherein the cushioning member is formed by calcining silicone resin or polyimide resin at a high temperature on the side of the light-absorbing surface of the light-to-heat conversion member formed film. 8. The reflector according to any one of claims 1 to 7, wherein cooling fins are provided on the outer surface of the concave mirror-shaped base and are integrally formed with the base body. 9. A light source device comprising, in addition to a light source, the reflector according to any one of claims 1 to 8. 10. A projection display device comprising the light source device according to claim 9.

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