KR19990011806A - Optical separation apparatus and method using polarization angle and manufacturing method of optical separation apparatus - Google Patents

Abstract

In general, the light is separated and applied variously according to the use of the apparatus. An image projection device that separates the light source using a color separation filter or a Dichroic Mirror, implements the large screen by directly projecting the image information on each screen, and implements the image by a specially designed color filter A color scanner, a color copying machine, and the like, which are suitable for the respective applications.

The present invention relates to the separation of white light, which is initially incident, in order to color-distinguish such a white light source so that it can be applied to each application. The white light is divided into a blue, (Green), red (red), and the like, and has a structure for smoothly introducing the separated parallel beam into a part such as a modulator for loading information.

Conventional optical separation devices of optical devices use a prism, a dichroic mirror, a dye, and a filter to separate incident beams. This is not easy due to the optical efficiency and alignment of the optical system, and the structure of the optical system is so large that miniaturization and commercialization are limited. Also, it was difficult to lower the cost in terms of manufacturing and cost of each device.

In the present invention, the structure of the white light incidence portion is improved to miniaturize and integrate the optical system, so that the optical system can be easily aligned and can be applied to various optical separation mechanisms at a low manufacturing cost.

Description

Optical separation apparatus and method using polarization angle and manufacturing method of optical separation apparatus

A light applying apparatus using a white light source is composed of a light generating unit, an optical modulating unit, and a scanning unit. When the white light is generated in the light generating part, the separated light source is incident on the light modulating part so that the beam is modulated from the respective image signals, and the modulated beam is imaged by the scanning part. In the case of the image implementing apparatus, the first incident white light uses a first dichroic mirror for separating the blue beam to reflect the blue beam, and the passed beam uses a second dichroic mirror to separate the green beam, And the passed red beam is reflected by the broadband high reflection mirror and separated into three beams, respectively. However, each of the separated beams must be accurately aligned with the optical system so that modulation can be performed from the optical modulation unit. In this case, a minimum space is required depending on the size of each color separation filter, thereby increasing the configuration of the optical system, and optical alignment between the respective elements and the modulator is required, resulting in a loss. This results in a large-scale system as a whole, making it difficult to commercialize the system.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of separating a white light source from a white light source for the purpose of color separation of a white light source, And the white light is separated into a desired wavelength region such as blue, green, and red, and a polarized angle that allows the separated parallel beams to smoothly enter the modulator and the like for carrying information And an object of the present invention is to provide an optical isolating apparatus and method and a manufacturing method of the optical isolating apparatus.

FIG. 1 is a cross-sectional view

2 is a detailed view of the optical isolator according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1: incident light source

2: photoconductive medium

3: 1st dichroic mirror

4: second dichroic mirror

5:? 1

6:? 2

7:? 3

8: incidence plane

9: Transmissive surface

It is an object of the present invention to improve the structure of optical separation, to easily align an optical system, to miniaturize a system, and to dramatically improve the structure of a light application apparatus. In order to achieve this object, the structure of a light separation unit incident from a white light source is as follows.

An incidence surface formed so that light incident at a first angle from the light source is refracted in the medium at a second angle;

A first dichroic mirror that transmits only light of a first wavelength out of the medium with respect to light incident from the incident surface and reflects light of a different wavelength at the second angle;

A total reflection surface on which light reflected from the first dichroic mirror causes total reflection at the second angle;

A second dichroic mirror which transmits only light of a second wavelength different from the first wavelength to the light reflected from the total reflection surface and reflects light of another wavelength at the second angle;

A total reflection surface that totally reflects light reflected from the second dichroic mirror at the second angle;

And a third wave different from the first and second wavelengths with respect to the light reflected from the total reflection surface.

A transmissive surface formed as a non-reflective coating film so that light having a long wavelength is transmitted outside the medium in parallel with the first wavelength and the second wavelength without loss of light;

A medium in which light incident from the incident surface and light reflected by the first and second dichroic mirrors and the total reflection surface proceeds;

.

The first angle is a Brewster angle from a vertical direction of an incident surface, and the second angle is a total reflection angle determined by a refractive index of the medium, and is an angle from a vertical direction of the reflection surface.

And the total reflection surface is spaced apart from and parallel to the first and second dichroic mirrors by the medium at an equal distance t, and the light having the first wavelength transmitted from the first dichroic mirror, The interval formed by the light of the second wavelength transmitted from the wiper is equal to the interval between the light of the second wavelength transmitted from the second dichroic mirror and the light of the third wavelength transmitted from the transmitting surface .

The transmissive surface may be formed by forming an antireflective coating film on the substrate on which the first and second dichroic mirrors are formed or by processing the transmissive surface perpendicular to the direction in which the beam of the third wavelength advances, .

In the present invention, in order to adjust the interval between the light of the first wavelength transmitted and the light of the second wavelength transmitted or the light of the transmitted second wavelength and the light of the third wavelength transmitted, The thickness t of the medium is varied.

In the present invention, if the first, second, and third wavelength lights are red, green, and blue wavelengths, the present invention is applied as follows.

The incident surface 8 of the light conducting medium 2 is formed by cutting the incident light 8 such that the light 1 incident from the vertical direction of the incident surface is incident at the Böstler angle and is totally reflected at a predetermined angle on the total reflection surface, A DM1 (Dichroic mirror1) coating film 3 for transmitting a light of wavelength λ1 and reflecting other light, a DM2 (Dichroic mirror2) coating film 4 for transmitting λ2 and reflecting λ3, A nonreflective coating is formed on the red beam to form a transmission surface. The beams having passed through the optical splitting unit constructed as above are separated into? 1 (5),? 2 (6), and? 3 (7), respectively. Here, the total slope is parallel to DM1 and DM2 and has the same distance, and lambda 1, lambda 2 and lambda 3 correspond to one of red (R), green (G) and blue (B), respectively. Hereinafter, for the sake of clarity, it is explained that lambda 1 corresponds to blue, lambda 2 to green, and lambda 3 corresponds to red.

As described above, the present invention is advantageous for commercialization and downsizing because of miniaturization of a module and a simple optical system configuration because a miniaturized optical splitting structure exhibits the same performance as a conventional optical system. Particularly, according to the present invention, it is possible to manufacture a large-scale optical separation unit with a very compact structure and low cost, and its application field and economic value are very effective inventions.

Claims (15)

An incidence surface formed so that light incident at a first angle from the light source is refracted in the medium at a second angle; A first dichroic mirror that transmits only light of a first wavelength out of the medium with respect to light incident from the incident surface and reflects light of a different wavelength at the second angle; A total reflection surface on which light reflected from the first dichroic mirror causes total reflection at the second angle; A second dichroic mirror which transmits only light of a second wavelength different from the first wavelength to the light reflected from the total reflection surface and reflects light of another wavelength at the second angle; A total reflection surface that totally reflects light reflected from the second dichroic mirror at the second angle; A reflective surface formed of a non-reflective coating film such that light having a third wavelength different from the first and second wavelengths is transmitted through the medium in parallel with the first wavelength and the second wavelength with no light loss, ;and Light incident from the incident surface and the first and second dichroic mirrors; And a medium in which the light reflected by the total reflection surface travels. The optical device according to claim 1, wherein the first angle is a Brewster angle from a vertical direction of an incident surface, and the second angle is a total reflection angle determined by a refractive index of the medium, And a polarization angle of the optical signal. The optical separation device according to claim 2, wherein the total reflection plane is parallel to the first and second dichroic mirrors. The optical separation device according to claim 3, wherein the first and second dichroic mirrors and the total reflection surface are spaced equidistantly from each other by the medium. 5. The light source device according to claim 4, wherein an interval between the light of the first wavelength transmitted from the first dichroic mirror and the light of the second wavelength transmitted from the second dichroic mirror is transmitted from the second dichroic mirror And an interval between the light of the second wavelength and the light of the third wavelength transmitted from the transmitting surface. The method as claimed in claim 5, wherein an interval between the transmitted light of the first wavelength and the transmitted light of the second wavelength or an interval between the transmitted light of the second wavelength and the transmitted light of the third wavelength is Characterized in that the thickness (t) of the medium is varied to adjust the polarization angle. The method as claimed in claim 1, wherein the transmissive surface is formed by forming an antireflection coating film on a substrate having first and second dichroic mirrors formed thereon, or by forming a transmissive surface perpendicular to the direction in which the beam of the third wavelength advances Reflection coating film is formed on the surface of the substrate. The optical separation device according to any one of claims 2 to 7, wherein the incident light is white light. The optical isolator according to claim 8, wherein the first, second, and third wavelengths are wavelengths having red, wavelengths having green, and blue. Entering incident light incident at a first angle into the medium at a second angle through an incident surface; Transmitting only the light of the first wavelength out of the medium at the second angle with respect to the incident incident light and firstly reflecting the light of another wavelength into the medium at the second angle; A first total reflection of the primary reflected light into the medium at the second angle; Transmitting only the light of the second wavelength different from the first wavelength to the first total reflected light out of the medium at the second angle and secondly reflecting the light of the other wavelength at the second angle; A second total reflection of the second reflected light into the medium at the second angle; And transmitting light having a third wavelength different from the first and second wavelengths to the second total reflected light out of the medium through the transmission surface in parallel with the first wavelength and the second wavelength. Lt; / RTI > The optical device according to claim 10, wherein the first angle is a Brewster angle from a vertical direction of an incident surface, and the second angle is a total reflection angle determined by a refractive index of the medium, . ≪ / RTI > The method according to claim 11, wherein an interval between the light of the first wavelength transmitted and the light of the second wavelength transmitted or the interval of the light of the second wavelength transmitted and the light of the third wavelength transmitted is And adjusting the thickness t of the medium to be adjusted. The optical separation method according to any one of claims 10 to 12, wherein the incident light is white light. 14. The optical separation method according to claim 13, wherein the first, second, and third wavelengths are wavelengths having red, wavelengths having green, and blue. A total reflection angle at which a light incident on a flat surface of a flat substrate having a thickness t and a refractive index n and having a good flatness on both planes from a light source to a Brewster's angle is determined by a refractive index n of the flat substrate, Forming an incidence surface by cutting And a second total reflection angle for reflecting light having a first wavelength at the total reflection angle and for light having a different wavelength at the total reflection angle with respect to light transmitted from the incident surface to a partial area on the substrate opposite to the plane on which the incident surface is formed, Forming a dichroic mirror; Forming a total reflection surface for reflecting light reflected from the first dichroic mirror at the total reflection angle in a remaining area on the substrate on the plane on which the incidence plane is formed; Wherein the first dichroic mirrors are formed to transmit only light of a second wavelength different from the first wavelength with respect to light reflected from the total reflection plane at the total reflection angle and reflect the light of another wavelength at the total reflection angle Forming a second dichroic mirror on the substrate adjacent to the first dichroic mirror; And a second dichroic mirror for transmitting light having a third wavelength different from the first and second wavelengths to light reflected from the total reflection surface, out of the medium in parallel with the first and second wavelengths without loss of light, And forming a nonreflective coating film on the transmission surface so as to be adjacent to the second dichroic mirror on the substrate on the surface on which the second dichroic mirror is formed.