Optical system and light conversion module thereof

Abstract

An optical system and its light conversion module are disclosed. The light conversion module includes a light source, a first prism, a second prism, a third prism, a light deflector, and a first wavelength plate. The light source has a light-emitting surface and emits a light ray having an optical axis. The first prism includes a first surface, a second surface, and a third surface. The second prism includes a fourth surface and a fifth surface. The third prism includes a sixth surface and a seventh surface. The light deflector is disposed on the first prism. The first wavelength plate is disposed on the first prism and is located away from the optical axis. The first surface faces the light-emitting surface, the second surface is connected to the sixth surface, the seventh surface is connected to the fourth surface, and the fifth surface is located away from the light-emitting surface. The second surface of the first prism or the sixth surface of the third prism serves as a beam-splitting surface. The optical axis passes through the first surface of the first prism, the second surface of the first prism, the sixth surface of the third prism, the seventh surface of the third prism, the fourth surface of the second prism, and the fifth surface of the second prism.

Claims

1. A light conversion module, comprising: A light source has a light-emitting surface that emits a light ray having an optical axis; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a third prism includes a sixth surface and a seventh surface; a light-directing element is disposed on the first prism; and a first wavelength plate is disposed on the first prism and located away from the optical axis; wherein the first surface faces the light-emitting surface, and the second surface is connected to the sixth surface. Then, the seventh surface is connected to the fourth surface, and the fifth surface is away from the light-emitting surface; wherein, the second surface of the first prism or the sixth surface of the third prism is a beam-splitting surface; wherein, the optical axis passes through the first surface of the first prism, the second surface of the first prism, the sixth surface of the third prism, the seventh surface of the third prism, the fourth surface of the second prism, and the fifth surface of the second prism; wherein, there is an air gap between the seventh surface and the fourth surface.

2. An optical conversion module, comprising: A light source has a light-emitting surface that emits a light ray having an optical axis; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a third prism includes a sixth surface and a seventh surface; a light-directing element is disposed on the first prism; and a first wavelength plate is disposed on the first prism and located away from the optical axis; wherein the first surface faces the light-emitting surface, the second surface is connected to the sixth surface, and the third surface... The seventh facet is connected to the fourth facet, and the fifth facet is away from the light-emitting surface; wherein the second facet of the first prism or the sixth facet of the third prism is a beam-splitting surface; wherein the optical axis passes through the first facet of the first prism, the second facet of the first prism, the sixth facet of the third prism, the seventh facet of the third prism, the fourth facet of the second prism, and the fifth facet of the second prism; wherein an anti-reflective coating is formed on the seventh facet of the third prism or the fourth facet of the second prism.

3. An optical conversion module, comprising: A light source has a light-emitting surface that emits a light ray having an optical axis; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a third prism includes a sixth surface and a seventh surface; a light-directing element is disposed on the first prism; and a first wavelength plate is disposed on the first prism and is located away from the optical axis; wherein the first surface faces... The light-emitting surface is such that the second surface is connected to the sixth surface, the seventh surface is connected to the fourth surface, and the fifth surface is away from the light-emitting surface; wherein the optical axis passes through the first surface of the first prism, the second surface of the first prism, the sixth surface of the third prism, the seventh surface of the third prism, the fourth surface of the second prism, and the fifth surface of the second prism; wherein the light-directing component is a prism or a reflective mirror.

4. A light conversion module, comprising: A light source has a light-emitting surface that emits light; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a light-directing component is disposed on the first prism; and a first wavelength plate is disposed on the first prism; wherein the second surface of the first prism is a beam-splitting surface; wherein the light beam includes a first beam and a second beam, the first beam... The beam passes sequentially through the first prism and the second prism, exiting from the fifth surface of the second prism. The second beam passes through the first surface of the first prism and is reflected by the beam-splitting surface. Then, it passes sequentially through the third surface of the first prism and the first wavelength plate, and is reflected by the light-deflecting device. After passing through the first wavelength plate again, it passes sequentially through the first prism and the second prism, exiting from the fifth surface of the second prism.

5. A light conversion module, comprising: A light source has a light-emitting surface that emits a light ray having an optical axis; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a light-directing component is disposed on the first prism; and a first wavelength plate is disposed on the first prism. The first surface faces the light-emitting surface, the second surface is connected to the sixth surface, the seventh surface is connected to the fourth surface, and the fifth surface is away from the light-emitting surface. The optical axis passes through the first surface, the second surface, and the third surface of the first prism. The sixth surface of the third prism, the seventh surface of the third prism, the fourth surface of the second prism, and the fifth surface of the second prism; wherein the light conversion module satisfies any of the following conditions or a combination thereof: 75%≦η≦90%; 1.6≦A5 / A1≦5.8; 1.51≦Nd≦1.95; where η is the light conversion efficiency of the light conversion module, which is the ratio of the amount of light leaving the fifth surface to the amount of light entering the first surface, A5 is the area of ​​the fifth surface, A1 is the area of ​​the first surface, and Nd is the refractive index of any prism.

6. A light conversion module, comprising: A light source has a light-emitting surface that emits a light ray having an optical axis; a first prism includes a first surface, a second surface, and a third surface; a second prism includes a fourth surface and a fifth surface; a light-directing element is disposed on the first prism; and a first wavelength plate is disposed on the first prism and located away from the optical axis; wherein the first surface faces the light-emitting surface, the second surface is connected to the sixth surface, and the seventh surface is connected to the first surface. The four sides are connected, with the fifth side being away from the light-emitting surface; wherein the optical axis passes through the first side of the first prism, the second side of the first prism, the sixth side of the third prism, the seventh side of the third prism, the fourth side of the second prism, and the fifth side of the second prism; wherein the second prism further includes an eighth side; wherein the fourth side and the eighth side form an angle, and the angle conforms to 46 degrees ≤ θ ≤ 63 degrees.

7. The optical conversion module as described in claims 4, 5 or 6 further includes a third prism disposed between the first prism and the second prism, the third prism including a sixth surface and a seventh surface; wherein the third surface of the first prism is sandwiched between the first surface and the second surface and is located away from the optical axis; the first wavelength plate is disposed between the optical deflector and the third surface of the first prism.

8. The optical conversion module as described in any one of claims 1 to 6, wherein the second prism further includes an eighth surface located away from the optical axis, wherein there is no air gap between the second prism and the third prism, and the second prism is composed of a plurality of sub-prisms.

9. The optical conversion module as described in any one of claims 1 to 6 further includes a second wavelength plate disposed on the fifth surface.

10. An optical system comprising a light conversion module as described in any one of claims 1 to 6 and a projection lens disposed on the fifth surface away from the light source.

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