CN103345066B

CN103345066B - Visible light and ultraviolet infrared light separation device of projector

Info

Publication number: CN103345066B
Application number: CN201310205347.5A
Authority: CN
Inventors: 梁志强
Original assignee: Wuhu Amt Micro Display Technology Co ltd
Current assignee: Wuhu Amt Micro Display Technology Co ltd
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2023-10-31
Anticipated expiration: 2033-05-29
Also published as: CN103345066A

Abstract

The application discloses a visible light and ultraviolet infrared light separation device of a projector, which consists of an irregularly-shaped light-tight medium, wherein the shape of the light-tight medium is limited by seven edges which are sequentially connected, light emitted by a light source of the projector vertically enters from a first edge (101), is reflected by a sixth edge (106) and is emitted from a fourth edge (104), wherein an included angle (i 1) between the light and the vertical line of the sixth edge (106) is equal to a critical total reflection angle of the visible light, and an included angle (i 2) between the visible light and the vertical line of the fourth edge (104) is equal to a critical total reflection angle of the ultraviolet light. The separating device can effectively remove harmful light in the light source, thereby reducing the energy carried by electromagnetic waves emitted by the light source, enabling the temperature of the optical element to be lower when the optical element works, and prolonging the service life of the projector.

Description

Visible light and ultraviolet infrared light separation device of projector

Technical Field

The application relates to a method for separating visible light and infrared light of a projector, and belongs to the field of projector manufacturing.

Background

The lamps used in the projector at present are mostly high-pressure mercury lamps, because the high-pressure mercury lamps have high luminous intensity, the requirements of the general projector are met, but the light emitted by the projector comprises infrared rays and ultraviolet rays besides visible light which can be used, wherein the infrared rays carry a large part of energy, so that the temperature of elements in the projector can be increased, the ageing of the elements in the projector is accelerated, and the service life of the projector is influenced. Although the ultraviolet rays only carry a small amount of energy, the ultraviolet rays belong to high-energy rays, the imaging screen in the projector can be damaged, and the projector is provided with a film for blocking the ultraviolet rays at present, but can not be guaranteed to block all the ultraviolet rays.

It is necessary to separate the infrared rays and the ultraviolet rays from the light source and change the light emitted from the projector into cold light.

Disclosure of Invention

The application aims to provide a method for separating visible light and infrared light of a projector, which is used for effectively separating two harmful light rays.

The technical scheme adopted by the application for solving the technical problems is as follows:

a visible light and ultraviolet infrared light separation device of a projector is composed of irregularly-shaped light-tight media, the shape of the light-tight media is limited by seven edges which are sequentially connected, light emitted by a light source of the projector vertically enters from a first edge (101), is reflected by a sixth edge (106) and exits from a fourth edge (104), wherein an included angle (i 1) between the light and the vertical line of the sixth edge (106) is equal to a critical total reflection angle of the visible light, and an included angle (i 2) between the visible light and the vertical line of the fourth edge (104) is equal to a critical total reflection angle of the ultraviolet light.

Further, it is preferable that the first side (101) is perpendicular to and connected with the second side (102) and the seventh side (107), and the third side (103) is parallel to the fifth side (105).

After the scheme is adopted, the separation device can effectively remove harmful light in the light source, so that the energy carried by electromagnetic waves emitted by the light source is reduced, the temperature of the optical element during working is lower, and the service life of the projector is prolonged.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

Drawings

The present application will be described in detail below with reference to the attached drawings, so that the above advantages of the present application will be more apparent. Wherein, the liquid crystal display device comprises a liquid crystal display device,

fig. 1 is a schematic diagram of a visible light and ultraviolet infrared light separation device of a projector according to the present application.

Detailed Description

The following will describe embodiments of the present application in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present application, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present application and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present application.

Those skilled in the art know that light is an electromagnetic wave, and that a light source generates a large number of electromagnetic waves of different frequencies at high temperatures, depending on the frequency. As the frequency of electromagnetic waves increases, electromagnetic waves can be roughly classified into infrared rays, visible rays, and ultraviolet rays. The infrared light only has a large amount of energy, which can cause the temperature of the element to be too high, and the ultraviolet light belongs to high-energy rays and is easy to damage the element.

In general, refraction occurs when light enters a photopine from an optically dense medium, and the refraction angle "r" increases as the frequency of the light increases under the same angle of incidence "i". When the incident angle "i" is gradually increased, the ultraviolet rays with the largest frequency are totally reflected when reaching a certain preset value, and the visible light and the infrared rays are still refracted, so that the ultraviolet rays are separated from the electromagnetic waves.

When the incident angle 'i' continues to increase, the visible light rays with the largest frequency are totally reflected and the infrared rays are still refracted when a certain preset value is reached, so that the infrared rays are separated from the electromagnetic waves.

Therefore, the application discloses a visible light and ultraviolet infrared light separation device of a projector according to the above-mentioned characteristic points, which consists of an irregularly-shaped optical dense medium, wherein the shape of the optical dense medium is limited by seven edges which are sequentially connected, and the light emitted by a light source of the projector vertically enters from a first edge 101, passes through the reflection of a sixth edge 106 and exits from a fourth edge 104, wherein an included angle (i 1) between the light and the vertical line of the sixth edge 106 is equal to the critical total reflection angle of the visible light, and an included angle (i 2) between the visible light and the vertical line of the fourth edge 104 is equal to the critical total reflection angle of the ultraviolet light.

Through the structure, when the device is used, the first side 101 of the device is perpendicular to the light emitted by the projector, and the light can finally obtain visible light with higher purity through total reflection, so that harmful light in the light source can be effectively removed, the energy carried by electromagnetic waves emitted by the light source is reduced, the temperature of the optical element during working is lower, and the service life of the projector is prolonged.

More specifically, as shown in fig. 1, the first side 101 is perpendicular to and connected to the second side 101 and the seventh side 107, and the third side 103 is parallel to the fifth side 105, i.e., the second side 101 and the seventh side 107 are parallel to each other.

In summary, the application has the following advantages:

1. the application can effectively remove the harmful light in the light source, thereby reducing the energy carried by the electromagnetic wave emitted by the light source, leading the temperature of the optical element to be lower when in work and prolonging the service life of the projector.

2. The requirement on the performance and the rotating speed of the cooling fan are reduced, so that the noise generated during the operation of the projector is reduced, and the projector is quieter during the operation.

It should be noted that, for simplicity of description, the above method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other order or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.

The foregoing description is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A visible light and ultraviolet infrared light separation device of a projector is composed of irregularly-shaped light-tight media, and is characterized in that the shape of the light-tight media is limited by seven edges which are sequentially connected, light emitted by a light source of the projector vertically enters from a first edge (101), is reflected by a sixth edge (106) and is emitted from a fourth edge (104), wherein an included angle (i 1) between the light and the vertical line of the sixth edge (106) is equal to a critical total reflection angle of the visible light, and an included angle (i 2) between the visible light and the vertical line of the fourth edge (104) is equal to a critical total reflection angle of the ultraviolet light.

2. The device of claim 1, wherein the first side (101) is perpendicular to and connected to the second side (102) and the seventh side (107), and the third side (103) is parallel to the fifth side (105).