JP2005148208A - Optical component and projector apparatus using the same - Google Patents

Abstract

The optical component of a projector apparatus employs a lot of resin-based materials such as a polarizing film. However, if the light quantity of a light source is increased in order to meet the demand for higher brightness of an image, not only the light quantity but also the heat quantity increases. There is a problem in that the resin material constituting the polarizing film changes in quality and causes characteristic deterioration.
A mirror film and an antireflection film are formed on the surface of a transparent substrate of a beam splitter. The transparent substrate 2 is a quartz substrate having a thermal conductivity superior to that of a glass substrate, and the mirror film 3 is formed on the surface B side facing the surface A on which light is incident, and the antireflection film 4 is formed on the surface A side. To do.
[Selection] Figure 1

Description

  The present invention relates to an optical component having a heat dissipation function in an optical component used in a projector apparatus.

  Currently, projector apparatuses are widely used in a wide range of applications from enterprises to general households. Along with this, there has been an increasing demand for higher image brightness, smaller devices, and lower prices in the projector market. FIG. 3 is a diagram for explaining the structure of the projector apparatus. Light emitted from the light source 31 passes through the polarization generating element 32 and the wave plate 42 and is uniformly condensed and emitted by the condenser lens 33. 34 to decompose the light. The beam splitter 34 has a function of forming a mirror film on the inclined surface of the plate and separating incident light into two of transmitted light and reflected light. The red light (R) is transmitted by the beam splitter 34, the blue light (B) and the green light (G) are reflected, the blue light (B) is transmitted by the beam splitter 35, and the green light (G) is transmitted. To reflect. After the light separation, the red light (R) and the blue light (B) are reflected by the reflection mirror 36, pass through the incident side polarizing film 38, and enter the transmissive liquid crystal 39. Then, the red light (R) and the blue light (B) emitted from the transmissive liquid crystal 39 pass through the emission side polarizing film 40 and the wave plate 42 and then enter the synthesis prism 41. The green light (G) passes through the incident side polarizing film 38, the transmissive liquid crystal 39, and the outgoing side polarizing film 40 and then enters the combining prism 41. After each color enters the combining prism 41, the light is combined and an image is projected onto the screen 50.

  A halogen lamp is often used for the light source 31 in order to meet demands for miniaturization, cost reduction, and high brightness of the projector device. The halogen lamp has a feature that it has a very small capacity and a long life compared with an incandescent bulb, and can emit stable light at a high color temperature until the end of the life. However, while high brightness light can be obtained, strong heat rays are emitted from the lamp. Therefore, there is a problem that the polarizing films 38 and 40 are heated to change the composition and deteriorate characteristics.

  As means for solving the above problems, a transparent substrate 37 such as quartz or sapphire having high thermal conductivity is attached to the polarizing films 38 and 40, or heat radiation of quartz or sapphire having high thermal conductivity is provided in the optical path between optical components. There is a method of dissipating heat by arranging a plate. However, since a new heat dissipating substrate has to be disposed in the projector apparatus, it has been difficult to reduce the cost and size.

  Therefore, as a method for increasing the heat dissipation effect without increasing the number of optical components of the projector apparatus, a method of configuring the beam splitter and the reflection mirror with a crystal or sapphire substrate having a high heat dissipation effect as shown in FIG. 4 has been proposed. The beam splitter 60 and the reflection mirror 70 are composed of transparent substrates 62 and 72 having a high heat radiation effect such as a crystal or sapphire substrate, and the incident light is separated into transmitted light and reflected light by the mirror films 63 and 73 or totally reflected.

However, since the light from the light source is directly applied to the mirror films 63 and 73 in the structure of FIG. 4, even if a crystal or sapphire substrate having a high radiation effect is used for the transparent substrates 62 and 72, the reflected light is not reflected inside the substrate. There is a problem that a sufficient heat dissipation effect cannot be obtained.
JP 2000-314809 A JP 2000-206507 A

  The projector component's optical components use many resin-based materials such as polarizing films. However, increasing the amount of light from the light source to meet the demands for higher image brightness increases the amount of heat as well as the amount of light. There is a problem that the resin material constituting the material deteriorates and the characteristics deteriorate.

  In order to achieve the above object, an optical component according to a first aspect of the present invention is the optical component having a function of forming a mirror film on the surface of the transparent member and transmitting and reflecting the light. The member is an optical component characterized in that the mirror film is formed on a surface opposite to a surface on which light is incident, and the member has a high heat radiation effect. The invention according to claim 2 is an optical component having a function of forming a mirror film on the surface of a plate-shaped transparent member and totally reflecting light, wherein the transparent member is a member having a high heat dissipation effect, and The optical component is characterized in that the mirror film is formed on a surface facing a surface on which light is incident. According to a third aspect of the present invention, in the optical component having a function of forming a mirror film on the surface of the triangular prism-shaped transparent member and totally reflecting light, the transparent member is a member having a high heat dissipation effect, and The optical component is characterized in that a mirror film is formed on the slope of the triangular prism. A fourth aspect of the present invention is the optical component according to any one of the first to third aspects, wherein an antireflection film is formed on the transparent member in the optical component. The invention according to claim 5 is the optical component according to any one of claims 1 to 4, wherein the transparent member is quartz or sapphire. A sixth aspect of the present invention is a liquid crystal projector including the optical component according to any one of the first to fifth aspects.

  Since the optical component of the present invention uses a member such as quartz or sapphire having a high heat dissipation effect as an optical member, and the mirror film is formed on the surface facing the light incident surface of the optical component, the heat dissipation effect is improved. As a result, it is possible to prevent the deterioration of the characteristics of the resin-based optical component.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings. FIG. 1 is a diagram for explaining an optical component according to a first embodiment of the present invention. The beam splitter 1 has a function of separating incident light into transmitted light and reflected light, and a mirror film 3 and an antireflection film 4 are formed on the surface of the transparent substrate 2. The transparent substrate 2 is a quartz substrate having a thermal conductivity 10 times as good as that of a glass substrate. The mirror film 3 is disposed on the surface B side facing the surface A on which light is incident, and the antireflection film 4 is disposed on the surface A side. Each is formed. In this embodiment, a quartz substrate is used as the transparent substrate 2, but another substrate having a heat dissipation effect such as a sapphire substrate may be used.

  By configuring the beam splitter as described above, light passes through the transparent substrate 2 and then irradiates the mirror film 3, so that both the transmitted light and the reflected light have a sufficient heat dissipation effect. Therefore, even if a halogen lamp is used as the light source, the heat is radiated when the light passes through the beam splitter. Therefore, it is possible to prevent the resin-based components from being deteriorated by heat and to newly dispose heat-radiating components. Since it is not necessary, it can greatly contribute to higher brightness, smaller size, and lower price.

  In FIG. 1, an antireflection film is formed on the beam splitter, but the antireflection film may be omitted. However, in this case, it is limited to a beam splitter that separates P-polarized light into transmitted light and reflected light.

  Next, a second embodiment of the present invention will be described. FIG. 2 is a diagram for explaining an optical component according to a second embodiment of the present invention. The plate-type reflection mirror 10 shown in FIG. 2A has a function of totally reflecting light, and a mirror film 13 and an antireflection film 14 are formed on the surface of the transparent substrate 12. The transparent substrate 12 is a quartz substrate whose thermal conductivity is 10 times as superior as that of a glass substrate, and the antireflection film 4 faces the mirror film 13 on the surface D side facing the surface C on which light is incident. It is formed on the C side. 2B has a structure in which an antireflection film 24 is formed on the surface E and the surface G of the quartz prism 22, and the surface F totally reflects incident light. ing. Note that the transparent substrate 12 and the prism 22 may use other members having a heat dissipation effect such as sapphire in addition to quartz.

  By configuring the reflection mirror as described above, the light irradiates the mirror film or the reflection part after passing through the transparent substrate or the prism, so that the reflected light has a sufficient heat dissipation effect. Therefore, even if a halogen lamp is used as the light source, the heat is radiated when the light passes through the radiation mirror, so that it is possible to prevent the resin-based components from being deteriorated by heat and to newly dispose heat radiating components. Since it is not necessary, it can greatly contribute to higher brightness, smaller size, and lower price.

  Further, although the antireflection film is formed on the reflection mirror in FIG. 2, the antireflection film may be omitted. However, in this case, it is limited to a reflection mirror that reflects P-polarized light.

It is an operation principle diagram of the beam splitter according to the first embodiment of the present invention. It is an operation | movement principle diagram of the reflective mirror which concerns on the 2nd Example of this invention, Comprising: (a) shows a plate-type reflective mirror, (b) shows a prism-type reflective mirror. The internal structure figure of a projector apparatus is shown. (A) shows a conventional beam splitter, and (b) shows a conventional reflecting mirror.

Explanation of symbols

1: Beam splitter 2: Transparent substrate 3: Mirror film 4: Antireflection film 10: Plate type reflection mirror 12: Transparent substrate 13: Mirror film 14: Antireflection film 20: Prism type reflection mirror 22: Prism 24: Antireflection film

Claims (6)

  In an optical component having a function of forming a mirror film on the surface of a transparent member and transmitting and reflecting light, the transparent member is a member having a high heat dissipation effect, and the surface facing the surface on which light is incident is An optical component comprising a mirror film.   In an optical component having a function of forming a mirror film on the surface of a plate-type transparent member and totally reflecting light, the transparent member is a member having a high heat dissipation effect and is a surface facing a surface on which light is incident An optical component having the mirror film formed thereon.   In an optical component having a function of forming a mirror film on the surface of a triangular prism-shaped transparent member and totally reflecting light, the transparent member is a member having a high heat dissipation effect, and a mirror film is formed on the inclined surface of the triangular prism. An optical component characterized in that is formed.   4. The optical component according to claim 1, wherein an antireflection film is formed on the transparent member in the optical component.   5. The optical component according to claim 1, wherein the transparent member is quartz or sapphire. A liquid crystal projector comprising the optical component according to claim 1.

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