Light source module

Abstract

The present invention provides a light source module, comprising a first light source, a first wavelength conversion unit, a second spectroscopic unit, a second light source, a second wavelength conversion unit and a first spectroscopic unit. The first light source is used to emit a first light with a first wavelength. The first wavelength conversion unit converts at least a portion of the first light into a first converted light with a second wavelength. The second spectroscopic unit allows light with a second wavelength and a third wavelength to pass through, while reflecting light with a first wavelength. The second light source emits a second light with a first wavelength. The second wavelength conversion unit converts at least a portion of the second light into a second converted light with a third wavelength, wherein the third wavelength, the second wavelength and the first wavelength are different from each other. The first spectroscopic unit is disposed between the first wavelength conversion unit and the second wavelength conversion unit, and is used to allow the first wavelength to be reflected and the second wavelength to pass through.

Description

Technical Field

[0001] The invention relates to a light source module. Background Art

[0002] The existing light source module provides at least one color of light. Generally speaking, the light source of the light source module mostly emits a single color of light. In order to increase the color richness of the light emitted by the light source module, a wavelength conversion unit is usually required to change the wavelength of the light emitted by the light source, and more light splitting units are required to obtain the required color of light through the characteristics of penetration and / or reflection. However, these components lead to a large volume of the light source module. Therefore, proposing a new light source module is one of the goals of the industry in this technical field. Summary of the invention

[0003] The embodiment of the present invention relates to a light source module, which can improve the above-mentioned conventional problems.

[0004] According to one embodiment of the present invention, a light source module is provided. The light source module includes a first light source, a first wavelength conversion unit, a second light splitting unit, a second light source, a second wavelength conversion unit and a first light splitting unit. The first light source is used to emit a first light with a first wavelength; the first wavelength conversion unit is arranged relative to the first light source, and is used to convert at least part of the first light into a first converted light with a second wavelength; the second light splitting unit is arranged relative to the first wavelength conversion unit, and is used to allow one of the first wavelength and the second wavelength to pass through, while the other is reflected, and is used to allow one of the first wavelength and the third wavelength to pass through, while the other is reflected; the second light source is arranged relative to the second light splitting unit, and is used to emit a second light with the first wavelength; the second wavelength conversion unit is arranged relative to the second light splitting unit, and is used to convert at least part of the second light into a second converted light with a third wavelength, and the third wavelength, the second wavelength and the first wavelength are different from each other; and the first light splitting unit is arranged between the first wavelength conversion unit and the second wavelength conversion unit, and is used to allow the first wavelength to be reflected and the second wavelength to pass through.

[0005] Preferably, the first light splitting unit is used to reflect the first light and the second light with the first wavelength back to the first wavelength conversion unit and the second wavelength conversion unit respectively, and allow the first converted light with the second wavelength and the second converted light with the third wavelength to penetrate.

[0006] Preferably, it also includes: a third light source, arranged relative to the second light splitting unit, for emitting a third light having the first wavelength; wherein the second light splitting unit is used to allow the second light and the third light having the first wavelength to be reflected, and to allow the first converted light having the second wavelength and the second converted light having the third wavelength to be transmitted; the third light source and the second light source are respectively located on opposite sides of the second light splitting unit.

[0007] Preferably, it also includes: a third light source, arranged relative to the second light splitting unit, for emitting a third light having the first wavelength; wherein the second light splitting unit is used to allow the second light and the third light having the first wavelength to pass through, and allow the first converted light and the second converted light having the second wavelength to be reflected; the third light source and the second light source are located on the same side of the second light splitting unit.

[0008] Preferably, a reflection unit is further included, and the first light source and the first wavelength conversion unit are configured between the reflection unit and the first light splitting unit.

[0009] Preferably, the first light source has a light emitting surface and a back surface opposite to each other, the first light is emitted from the light emitting surface, and the light source module further comprises: a reflection unit disposed on the back surface and used for reflecting the first light and the second converted light.

[0010] Preferably, the thickness of the first wavelength conversion unit is greater than the thickness of the second wavelength conversion unit.

[0011] Preferably, the first light source, the first wavelength conversion unit, the first light splitting unit, the second wavelength conversion unit and the second light splitting unit are arranged in sequence from the first light source to the second light splitting unit.

[0012] Preferably, at least two adjacent units among the first wavelength conversion unit, the first light splitting unit and the second wavelength conversion unit are in contact with each other.

[0013] Preferably, the first light source and the first wavelength conversion unit are in contact with each other.

[0014] Preferably, the first light source and the second light source are respectively located on two opposite sides of the first light splitting unit.

[0015] Preferably, the first wavelength conversion unit has a first surface and a third surface relative to each other, the second wavelength conversion unit has a second surface and a fourth surface relative to each other, the third surface and the fourth surface are respectively located on opposite sides of the first light splitting unit, the first light is incident on the first surface, and the second light is incident on the second surface.

[0016] Preferably, the second light is emitted from the second light source along an optical path through the second beam splitting unit to emit the second converted light, and the optical path sequentially passes through the second beam splitting unit, the second wavelength conversion unit, the first beam splitting unit, the first wavelength conversion unit, the first light source, the first wavelength conversion unit, the first beam splitting unit, the second wavelength conversion unit and the second beam splitting unit.

[0017] Preferably, the first light is emitted from the first light source through the second light splitting unit along an optical path to become the first converted light, and the optical path passes through the first wavelength conversion unit, the first light splitting unit, the second wavelength conversion unit and the second light splitting unit in sequence.

[0018] Compared with the prior art, the present invention proposes an optical module, including two light sources, two wavelength conversion units and two spectroscopic units. The two light beams emitted by the two light sources are respectively converted into two converted lights with different wavelengths by the two wavelength conversion units, and the light is emitted through one of the spectroscopic units, while the other spectroscopic unit is located between the two wavelength conversion units, and can reflect the light emitted by one of the light sources back to one of the wavelength conversion units to increase the conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a light source module according to an embodiment of the present invention is shown.

[0020] Figure 2 A schematic diagram of a light source module according to another embodiment of the present invention is shown.

[0021] Figure 3 A schematic diagram of a light source module according to another embodiment of the present invention is shown.

[0022] Figure 4 A schematic diagram of a light source module according to another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0023] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0024] Please refer to Figure 1 , which depicts a schematic diagram of a light source module 100 according to an embodiment of the present invention. The light source module 100 can be applied to a device requiring a light source, such as a projector, an illuminator, a display or other types of devices. When applied to a projection device, the light source module 100 can also be called a light combining module.

[0025] The light source module 100 includes a first light source 110 , a first wavelength conversion unit 120 , a first light splitting unit 130 , a second light source 140 , a second wavelength conversion unit 150 , a second light splitting unit 160 and a reflection unit 170 .

[0026] The first light source 110 is used to emit a first light B1 having a first wavelength. The first wavelength conversion unit 120 is disposed relative to the first light source 110 and is used to convert at least a portion of the first light B1 into a first converted light G1 having a second wavelength. The first light splitting unit 130 is disposed between the first wavelength conversion unit 120 and the second wavelength conversion unit 150 and is used to allow the first wavelength to be reflected and the second wavelength to be transmitted. The second light source 140 is disposed relative to the second light splitting unit 160 and is used to emit a second light B2 having a first wavelength. The second wavelength conversion unit 150 is disposed relative to the second light splitting unit 160 and is used to convert at least a portion of the second light B2 into a second converted light R1 having a third wavelength, wherein the third wavelength, the second wavelength and the first wavelength are different from each other. The second light splitting unit 160 is disposed relative to the first wavelength conversion unit 120 and is used to allow one of the first wavelength and the second wavelength to be transmitted and the other to be reflected and to allow one of the first wavelength and the third wavelength to be transmitted and the other to be reflected. In this embodiment, the second light splitting unit 160 allows the light with the first wavelength to be reflected, while the light with the second wavelength and the third wavelength to be transmitted. In summary, the first converted light G1 and the second converted light R1 are converted by the two separate wavelength conversion units 120 and 150, respectively. Due to the relative relationship of these optical elements of the light source module 100, a light source module 100 with a small volume can be obtained.

[0027] In the present embodiment, the first wavelength is, for example, one of red light, blue light, and green light, the second wavelength is, for example, another of red light, blue light, and green light, and the third wavelength is, for example, the rest of red light, blue light, and green light. The first wavelength, the second wavelength, and the third wavelength in the present embodiment are respectively described by taking blue light, green light, and red light as examples. The first light source 110 and the second light source 140 are, for example, light emitting diodes or laser light sources.

[0028] like Figure 1 As shown, in the optical path of the first light B1, the first light B1 is emitted from the first light source 110 along the optical path through the second light splitting unit 160, and the optical path sequentially passes through the first wavelength conversion unit 120 (which converts the first light B1 into the first converted light G1), the first light splitting unit 130, the second wavelength conversion unit 150, and the second light splitting unit 160. The first converted light G1 penetrates the second light splitting unit 160 and is incident on the module 10, such as the illumination module or the imaging module.

[0029] like Figure 1As shown, in the optical path of the second light B2, the second light B2 is emitted from the second light source 140 along the optical path through the second light splitting unit 160, and the optical path sequentially passes through the second light splitting unit 160, the second wavelength conversion unit 150 (converting the second light B2 into the second converted light R1), the first light splitting unit 130, the first wavelength conversion unit 120, the first light source 110, the reflection unit 170, the first wavelength conversion unit 120, the first light splitting unit 130, the second wavelength conversion unit 150 and the second light splitting unit 160. The second converted light R1 penetrates the second light splitting unit 160 and is incident on the module 10.

[0030] like Figure 1 As shown, the first light source 110 has a light emitting surface 110u and a back surface 110b opposite to each other, and the first light B1 is emitted from the light emitting surface 110u. The reflection unit 170 is disposed on the back surface 110b and is used to reflect the first light B1 and the second converted light R1.

[0031] like Figure 1 As shown, the first light source 110 and the second light source 140 are respectively located at two opposite sides of the first light splitting unit 130 , so that the first light B1 emitted by the first light source 110 and the second light B2 emitted by the second light source 140 are respectively incident on two opposite sides of the first light splitting unit 130 .

[0032] like Figure 1 As shown, two adjacent ones of the first light source 110, the first wavelength conversion unit 120, the first light splitting unit 130, the second wavelength conversion unit 150 and the reflection unit 170 are in contact with each other, which can reduce light loss. In addition, in terms of relative position, the reflection unit 170, the first light source 110, the first wavelength conversion unit 120, the first light splitting unit 130, the second wavelength conversion unit 150 and the second light splitting unit 160 are arranged in sequence from the first light source 110 to the second light splitting unit 160 (e.g., along a straight line).

[0033] like Figure 1 As shown, the first wavelength conversion unit 120 has a first surface 120i and a third surface 120e opposite to each other, and the second wavelength conversion unit 150 has a second surface 150i and a fourth surface 150e opposite to each other, and the third surface 120e and the fourth surface 150e are respectively located at two opposite sides of the first light splitting unit 130, and the first light B1 is incident into the first wavelength conversion unit 120 through the first surface 120i, so as to be converted into the first converted light G1 by the first wavelength conversion unit 120, and the second light B2 is incident into the second wavelength conversion unit 150 through the second surface 150i, so as to be converted into the second converted light R1 by the second wavelength conversion unit 150. In summary, the first light B1 and the second light B2 are respectively incident into the two separate wavelength conversion units, and the first converted light G1 and the second converted light R1 are respectively converted by the two separate wavelength conversion units.

[0034] The first wavelength conversion unit 120 and the second wavelength conversion unit 150 are conversion units with different wavelength conversion characteristics. Figure 1 As shown, the first wavelength conversion unit 120 includes a plurality of fluorescent particles 121, which can excite light to convert the wavelength of the light. For example, the first wavelength conversion unit 120 converts the first light B1 with a first wavelength into the first converted light G1 with a second wavelength. The second wavelength conversion unit 150 includes a plurality of fluorescent particles 151, which can excite light to convert the wavelength of the light. For example, the second wavelength conversion unit 150 converts the second light B2 with a first wavelength into the second converted light R1 with a third wavelength.

[0035] like Figure 1 As shown, the thickness T1 of the first wavelength conversion unit 120 is greater than the thickness T2 of the second wavelength conversion unit 150. In one embodiment, the thickness T1 is, for example, 1.1 to 3 times the thickness T2, but may also be larger or smaller. In terms of specific dimensions, the thickness T1 is, for example, between 0.15 millimeters (mm) and 0.3 mm, and the thickness T2 is, for example, between 0.1 mm and 0.25 mm. Since the first wavelength conversion unit 120 has a certain thickness, the path length of the first light B1' reflected back and forth between the first light splitting unit 130 and the reflection unit 170 can be increased to increase the probability or efficiency of converting the first light B1' into the first converted light G1.

[0036] The first light splitting unit 130 is, for example, a dichroic mirror. Figure 1 As shown, the first light splitting unit 130 allows light with a third wavelength (e.g., the second converted light R1) to pass through in addition to the light with the second wavelength. Blocked by the first light splitting unit 130, the first light B1 and the second light B2 cannot pass through the first light splitting unit 130. The first light splitting unit 130 can reflect the first light B1 and the second light B2 with the first wavelength back to the first wavelength conversion unit 120 and the second wavelength conversion unit 150, respectively, and allow the first converted light G1 with the second wavelength and the second converted light R1 with the third wavelength to pass through.

[0037] For example, Figure 1As shown, since the first light splitting unit 130 allows the first wavelength to be reflected, the first light B1 having the first wavelength is reflected by the first light splitting unit 130 back to the first wavelength conversion unit 120 (referred to as the first light B1'), so as to increase the probability or efficiency of the first light B1' being converted into the first converted light G1. The reflected first light B1' is incident on the reflection unit 170 and then reflected back to the first wavelength conversion unit 120, so as to increase the probability or efficiency of the first light B1' being converted into the first converted light G1. In addition, the first light source 110 and the first wavelength conversion unit 120 are disposed between the reflection unit 170 and the first light splitting unit 130, so that the first light B1' can be reflected back and forth between the first light splitting unit 130 and the reflection unit 170, so as to increase the probability or efficiency of the first light B1' being converted into the first converted light G1.

[0038] For another example, the second light B2 with the first wavelength is reflected back by the first light splitting unit 130 (referred to as the first light B1).

[0039] The second wavelength conversion unit 150. The first light B1" penetrates the second wavelength conversion unit 150 and is incident on the second light splitting unit 160, and is reflected from the second light splitting unit 160 to the outside of the light source module 100 or is processed by the light source module 100. The light amount of the first light B1" accounts for less than a preset ratio of the light amount of the second light B2, so the light loss caused by the second light B2 is very small. The aforementioned preset ratio is, for example, equal to or less than 5%.

[0040] The second light splitting unit 160 is, for example, a dichroic mirror. Figure 1 As shown, the configuration angle of the second light splitting unit 160 is, for example, 45 degrees, but the embodiment of the present invention is not limited thereto. In addition, the first light source 110, the first wavelength conversion unit 120, the first light splitting unit 130, the second light source 140, the second wavelength conversion unit 150 and the reflection unit 170 are located on the same side of the second light splitting unit 160, and the second light B2, the first converted light G1 and the second converted light R1 are all incident on the same surface of the second light splitting unit 160.

[0041] Please refer to Figure 2 , which illustrates a schematic diagram of a light source module 200 according to another embodiment of the present invention. The light source module 200 includes a first light source 110, a first wavelength conversion unit 120, a first light splitting unit 130, a second light source 140, a second wavelength conversion unit 150, a second light splitting unit 160, a reflection unit 170, and a third light source 210. The light source module 200 of the embodiment of the present invention has technical features similar to or the same as those of the aforementioned light source module 100, except that the light source module 200 further includes a third light source 210.

[0042] The third light source 210 is arranged relative to the second light splitting unit 160 to emit a third light B3 having a first wavelength. The second light splitting unit 160 is used to allow light having a first wavelength (e.g., the second light B2 and the third light B3) to be reflected and allow light having a second wavelength (e.g., the first converted light G1) and light having a third wavelength (e.g., the second converted light R1) to pass through. After the third light B3 is reflected from the second light splitting unit 160, it is incident on the module 10. In this way, the first converted light G1, the second converted light R1, and the third light B3 of different light colors are incident on the module 10 through the second light splitting unit 160, so that the light source module 200 provides more color-changing light.

[0043] like Figure 2 As shown, the third light source 210 and the second light source 140 are respectively located at opposite sides of the second light splitting unit 160 , so that the third light B3 emitted by the third light source 210 and the second light B2 emitted by the second light source 140 are respectively reflected in two opposite directions to the module 10 and the second wavelength conversion unit 150 .

[0044] Please refer to Figure 3 , which depicts a schematic diagram of a light source module 300 according to another embodiment of the present invention. The light source module 300 includes a first light source 110, a first wavelength conversion unit 120, a first beam splitter unit 130, a second light source 140, a second wavelength conversion unit 150, a second beam splitter unit 360, and a reflection unit 170. The light source module 300 of the embodiment of the present invention has technical features similar to or the same as those of the aforementioned light source module 100, except that the beam splitting characteristics of the second beam splitter unit 360 of the light source module 300 are different from the beam splitting characteristics of the second beam splitter unit 160. The second beam splitter unit 360 is, for example, a dichroic beam splitter.

[0045] In this embodiment, the second light splitting unit 360 allows light with a first wavelength (eg, the second light B2 and the third light B3 ) to pass through, and allows light with a second wavelength (eg, the first converted light G1 ) and light with a third wavelength (eg, the second converted light R1 ) to be reflected.

[0046] like Figure 3 As shown, in the optical path of the first light B1, the first light B1 is emitted from the first light source 110 along the optical path through the second light splitting unit 360, and the optical path sequentially passes through the first wavelength conversion unit 120 (which converts the first light B1 into the first converted light G1), the first light splitting unit 130, the second wavelength conversion unit 150 and the second light splitting unit 360. After being reflected from the second light splitting unit 160, the first converted light G1 is incident on the module 10.

[0047] like Figure 3As shown, in the optical path of the second light B2, the second light B2 is emitted from the second light source 140 along the optical path through the second light splitting unit 360, and the optical path sequentially passes through the second light splitting unit 360, the second wavelength conversion unit 150 (converting the second light B2 into the second converted light R1), the first light splitting unit 130, the first wavelength conversion unit 120, the first light source 110, the reflection unit 170, the first wavelength conversion unit 120, the first light splitting unit 130, the second wavelength conversion unit 150 and the second light splitting unit 360. After being reflected from the second light splitting unit 160, the second converted light R1 is incident on the module 10.

[0048] Please refer to Figure 4 , which illustrates a schematic diagram of a light source module 400 according to another embodiment of the present invention. The light source module 400 includes a first light source 110, a first wavelength conversion unit 120, a first light splitting unit 130, a second light source 140, a second wavelength conversion unit 150, a second light splitting unit 360, a reflection unit 170, and a third light source 210. The light source module 400 of the embodiment of the present invention has technical features similar to or the same as those of the aforementioned light source module 300, except that the light source module 400 further includes a third light source 210.

[0049] The third light source 210 is disposed relative to the second light splitting unit 360 to emit a third light B3 having a first wavelength. The third light B3 is reflected from the second light splitting unit 160 and incident on the module 10. Thus, the first converted light G1, the second converted light R1 and the third light B3 of different light colors are incident on the module 10 through the second light splitting unit 360, so that the light source module 400 provides more color-changing light.

[0050] like Figure 4 As shown, the third light source 210 and the second light source 140 are located at the same side of the second light splitting unit 360 , and the third light B3 emitted by the third light source 210 and the second light B2 emitted by the second light source 140 are incident on the same surface of the second light splitting unit 360 .

[0051] In summary, the embodiment of the present invention provides an optical module, which can be applied to any device that requires light. The optical module includes two light sources, two wavelength conversion units and two spectroscopic units. The two light beams emitted by the two light sources are respectively converted into two converted lights with different wavelengths by the two wavelength conversion units, and the two lights are emitted through one of the spectroscopic units, while the other spectroscopic unit is located between the two wavelength conversion units, and can reflect the light emitted by one of the light sources back to one of the wavelength conversion units to increase the conversion efficiency.

[0052] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A light source module, characterized in that: include: A first light source has a light emitting surface and a back surface opposite to each other, wherein the light emitting surface is used to emit a first light having a first wavelength; A first wavelength conversion unit is disposed relative to the first light source and is used to convert at least a portion of the first light into a first converted light having a second wavelength; A second light splitting unit is disposed relative to the first wavelength conversion unit and is used to allow one of the first wavelength and the second wavelength to pass through and reflect the other, and is used to allow one of the first wavelength and the third wavelength to pass through and reflect the other; A second light source is disposed opposite to the second light splitting unit and is used to emit a second light having the first wavelength; A second wavelength conversion unit is disposed opposite to the second light splitting unit and is used to convert at least a portion of the second light into a second converted light having a third wavelength, wherein the third wavelength, the second wavelength and the first wavelength are different from each other; A first light splitting unit is disposed between the first wavelength conversion unit and the second wavelength conversion unit and is used to allow the first wavelength to be reflected and the second wavelength to be transmitted; as well as The reflection unit is disposed on the back surface and is used to reflect the first light and the second converted light. The first light source and the first wavelength conversion unit are disposed between the reflection unit and the first light splitting unit.

2. The light source module according to claim 1, characterized in that: The first light splitting unit is used for reflecting the first light and the second light with the first wavelength back to the first wavelength conversion unit and the second wavelength conversion unit respectively, and allowing the first converted light with the second wavelength and the second converted light with the third wavelength to penetrate.

3. The light source module according to claim 1, characterized in that: Also includes: A third light source is disposed opposite to the second light splitting unit and is used to emit a third light having the first wavelength; The second light splitter unit is used to allow the second light and the third light with the first wavelength to be reflected, and to allow the first converted light with the second wavelength and the second converted light with the third wavelength to be transmitted; the third light source and the second light source are respectively located on two opposite sides of the second light splitter unit.

4. The light source module according to claim 1, characterized in that: Also includes: A third light source is disposed opposite to the second light splitting unit and is used to emit a third light having the first wavelength; The second light splitting unit is used to allow the second light and the third light with the first wavelength to penetrate, and allow the first converted light and the second converted light with the second wavelength to reflect; the third light source and the second light source are located on the same side of the second light splitting unit.

5. The light source module according to claim 1, characterized in that: The thickness of the first wavelength conversion unit is greater than the thickness of the second wavelength conversion unit.

6. The light source module according to claim 1, characterized in that: The first light source, the first wavelength conversion unit, the first light splitting unit, the second wavelength conversion unit and the second light splitting unit are arranged in sequence from the first light source to the second light splitting unit.

7. The light source module according to claim 1, characterized in that: At least two adjacent units among the first wavelength conversion unit, the first light splitting unit and the second wavelength conversion unit are in contact with each other.

8. The light source module according to claim 1, characterized in that: The first light source and the first wavelength conversion unit are in contact with each other.

9. The light source module according to claim 1, characterized in that: The first light source and the second light source are respectively located at two opposite sides of the first light splitting unit.

10. The light source module according to claim 1, characterized in that: The first wavelength conversion unit has a first surface and a third surface opposite to each other, the second wavelength conversion unit has a second surface and a fourth surface opposite to each other, the third surface and the fourth surface are respectively located on two opposite sides of the first light splitting unit, the first light is incident on the first surface, and the second light is incident on the second surface.

11. The light source module according to claim 1, characterized in that: The second light is emitted from the second light source through the second beam splitter unit along an optical path to emit the second converted light, and the optical path sequentially passes through the second beam splitter unit, the second wavelength conversion unit, the first beam splitter unit, the first wavelength conversion unit, the first light source, the first wavelength conversion unit, the first beam splitter unit, the second wavelength conversion unit and the second beam splitter unit.

12. The light source module according to claim 1, characterized in that: The first light is emitted from the first light source through the second light splitting unit along an optical path to become the first converted light. The optical path passes through the first wavelength conversion unit, the first light splitting unit, the second wavelength conversion unit and the second light splitting unit in sequence.

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