Light source module

Abstract

The invention provides a light source module. The light source module comprises a wavelength conversion unit, a first lens, a second lens, a light path turning element and a light-emitting element, the first lens is disposed in front of the wavelength conversion unit, and the second lens is disposed in front of the first lens. The optical path turning element is disposed beside the second lens and is not located on the optical axis of the first lens. The light-emitting element is arranged beside the first lens and is used for emitting a first light beam. The first light beam is sequentially turned by the light path turning element, penetrates through the first lens and is transmitted to the wavelength conversion unit, and the wavelength conversion unit is used for converting the first light beam into a second light beam. The wavelength of the first light beam is different from that of the second light beam, and the second light beam sequentially penetrates through the first lens and the second lens.

Description

Technical Field

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

[0002] With the advancement of optoelectronic technology, a light source module that uses a laser beam to excite phosphors to emit fluorescence has been developed. In this light source module, since the laser beam has high light intensity, it can also excite high-intensity fluorescence, thereby providing a light source with high luminous intensity.

[0003] In order to separate the optical paths of the laser beam incident on the phosphor and the fluorescence excited by it, a dichroic mirror is used in the conventional technology. Specifically, the wavelength of the laser beam is different from the wavelength of the fluorescence. The dichroic mirror has different reflectivity or transmittance for different wavelength ranges, and the dichroic mirror can be designed to be suitable for reflecting the laser beam and suitable for allowing the fluorescence to pass through. In this way, the laser beam from the laser light source can be reflected by the dichroic mirror and then converged to the phosphor through the lens to excite the fluorescence, and the fluorescence is collimated by the lens and then passes through the dichroic mirror. After passing through the dichroic mirror, it is separated from the optical path of the laser beam and will not irradiate the laser light source.

[0004] Although the above structure using a dichroic mirror can separate the optical paths of the fluorescence and the laser beam so that the fluorescence will not be transmitted back to the laser light source, the dichroic mirror also occupies a large space in front of the lens, making the volume of the optical system larger. Summary of the invention

[0005] An object of the present invention is to provide a light source module with a smaller volume and lower cost.

[0006] One embodiment of the present invention proposes a light source module, which includes: a wavelength conversion unit; a first lens, arranged in front of the wavelength conversion unit; a second lens, arranged in front of the first lens; an optical path turning element, arranged next to the second lens and not located on the optical axis of the first lens; and a light-emitting element, arranged next to the first lens and used to emit a first light beam, wherein the first light beam is sequentially turned by the optical path turning element and penetrates the first lens and is transmitted to the wavelength conversion unit, and the wavelength conversion unit is used to convert the first light beam into a second light beam, the wavelength of the first light beam is different from the wavelength of the second light beam, and the second light beam sequentially penetrates the first lens and the second lens.

[0007] In a preferred embodiment, the first light beam emitted by the light emitting element is transmitted to the light path turning element in the space on the side of the first lens away from the optical axis, and the first light beam turned by the light path turning element is incident on the first lens obliquely.

[0008] In a preferred embodiment, the optical path turning element has a reflective surface facing away from the second lens, and a light homogenizing element is further disposed on the reflective surface.

[0009] In a preferred embodiment, the light homogenizing element is a diffuser or a fly-eye lens.

[0010] In a preferred embodiment, the surface of the second lens facing the first lens also faces the light path turning element, and there is a distance between the light path turning element and the second lens; alternatively, the light path turning element is disposed on the surface of the second lens facing the first lens.

[0011] In a preferred embodiment, another light-emitting element is further included, wherein the wavelength conversion unit is configured between the other light-emitting element and the first lens, and is used to convert the light beam emitted by the other light-emitting element into the second light beam, and the wavelength of the second light beam is different from the wavelength of the light beam emitted by the other light-emitting element.

[0012] In a preferred embodiment, the other light-emitting element is a light-emitting diode chip, and the wavelength conversion unit is a phosphor layer covering the light-emitting diode chip.

[0013] In a preferred embodiment, a plurality of the light emitting elements are included to respectively emit a plurality of the first light beams, wherein the light path turning element is used to turn the plurality of the first light beams to the wavelength conversion unit.

[0014] In a preferred embodiment, it includes a plurality of the light-emitting elements and a plurality of the light path turning elements, wherein the plurality of the light-emitting elements are used to respectively emit a plurality of the first light beams, and the plurality of the light path turning elements are used to respectively turn the plurality of the first light beams to the wavelength conversion unit.

[0015] In a preferred embodiment, the configuration positions of the multiple light path turning elements include positions on opposite sides of the optical axis of the first lens, and the configuration positions of the multiple light emitting elements include positions on opposite sides of the optical axis of the first lens.

[0016] In a preferred embodiment, the wavelength conversion unit is a phosphor layer or a phosphor rotating wheel.

[0017] In a preferred embodiment, a light valve is further included, which is disposed on the path of the second light beam from the second lens and is used to convert the second light beam into an image light beam.

[0018] In a preferred embodiment, the light valve is a digital micromirror device.

[0019] In a preferred embodiment, it also includes a concave mirror, which is arranged on the path of the second light beam from the second lens and is used to reflect the second light beam to the light valve; or, it also includes a lens, which is arranged on the path of the image light beam from the light valve and is used to project the image light beam to the outside, wherein the light source module is a headlight.

[0020] In the light source module of the embodiment of the present invention, the light path turning element is arranged beside the second lens and is not located on the optical axis of the first lens, and the first light beam is sequentially turned by the light path turning element and penetrates the first lens to be transmitted to the wavelength conversion unit, while the second light beam sequentially penetrates the first lens and the second lens. Therefore, through such a design, the effect of separating the light paths of the first light beam and the second light beam can be achieved with a smaller space, and a color separation mirror that takes up space can be omitted in front of the first lens and the second lens. Therefore, the light source module of this embodiment can have a smaller volume and lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a schematic diagram of a light path of a light source module according to an embodiment of the present invention.

[0022] Figure 2 FIG. 4 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention.

[0023] Figure 3 FIG. 4 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention.

[0024] Figure 4 FIG. 4 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention.

[0025] Figure 5 FIG. 4 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention.

[0026] Figure 6 FIG. 4 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] Figure 1 FIG. 1 is a schematic diagram of the light path of a light source module according to an embodiment of the present invention. Figure 1The light source module 100 of the present embodiment includes a wavelength conversion unit 110, a first lens 120, a second lens 130, an optical path turning element 140 and a light emitting element 150. In the present embodiment, the wavelength conversion unit 110 is a phosphor layer or a phosphor rotating wheel. The first lens 120 is disposed in front of the wavelength conversion unit 110, and the second lens 130 is disposed in front of the first lens 120. The optical path turning element 140 is disposed beside the second lens 130 and is not located on the optical axis A1 of the first lens 120. The light emitting element 150 is disposed beside the first lens 120 and is used to emit a first light beam 152. The first light beam 152 is sequentially turned by the optical path turning element 140 and penetrates the first lens 120 and is transmitted to the wavelength conversion unit 110. In the present embodiment, the first light beam 152 emitted by the light emitting element 150 is transmitted to the optical path turning element 140 in the space on the side of the first lens 120 away from the optical axis A1. In addition, in the present embodiment, the light path turning element 140 is a reflector, which is used to reflect the first light beam 152 emitted by the light emitting element 150 to the wavelength conversion unit 110. Specifically, the light path turning element 140 reflects the first light beam 152 from the light emitting element 150 to the first lens 120, and then the first light beam 152 passes through the first lens 120 and is transmitted to the wavelength conversion unit 110. In the present embodiment, the first light beam 152 turned by the light path turning element 140 is incident on the first lens 120 obliquely. In one embodiment, the first lens 120 can converge the nearly parallel first light beam 152 onto the wavelength conversion unit 110. In addition, in the present embodiment, the light path turning element 140 is configured on the surface 132 of the second lens 130 facing the first lens 120.

[0029] In the present embodiment, the light emitting element 150 is a laser light source, such as a laser diode, and the first light beam 152 is a laser light beam. The wavelength conversion unit 110 is used to convert the first light beam 152 into a second light beam 112, wherein the wavelength of the first light beam 152 is different from the wavelength of the second light beam 112. For example, when the wavelength conversion unit 110 is a phosphor layer or a phosphor rotating wheel, the first light beam 152 will excite the phosphor on the phosphor layer or the phosphor rotating wheel to generate fluorescence, and this fluorescence is the second light beam 112. Then, the second light beam 112 sequentially penetrates the first lens 120 and the second lens 130 and is transmitted to the outside to provide lighting to the outside. When the wavelength conversion unit 110 is a phosphor rotating wheel, the phosphor rotating wheel can rotate continuously to make different parts of the phosphor layer be irradiated by the first light beam 152 in sequence, so as to achieve a heat source dispersion effect, so that heat is less likely to accumulate on the phosphor layer.

[0030] In the light source module 100 of the present embodiment, the light path turning element 140 is disposed beside the second lens 130 and is not located on the optical axis A1 of the first lens 120, and the first light beam 152 is sequentially turned by the light path turning element 140 and penetrates the first lens 120 to be transmitted to the wavelength conversion unit 110, while the second light beam 112 sequentially penetrates the first lens 120 and the second lens 130. Therefore, through such a design, the effect of separating the light paths of the first light beam 152 and the second light beam 112 can be achieved with a smaller space, and a dichroic mirror that occupies a larger space can be omitted in front of the first lens 120 and the second lens 130. Therefore, the light source module 100 of the present embodiment can have a smaller volume and lower cost.

[0031] In the present embodiment, the light source module 100 may be a headlight of a car, the first light beam 152 may be, for example, blue light, and the second light beam 112 may be, for example, yellow light. A reflective substrate may be provided below the phosphor layer of the wavelength conversion unit 110. In addition to reflecting the second light beam 112 to the first lens 120, the reflective substrate may also reflect the first light beam 152 that has not been converted by the phosphor layer to the first lens 120 in one embodiment. In this way, the yellow second light beam 112 and the blue first light beam 152 that has not been converted can be mixed into white light, and sequentially penetrate the first lens 120 and the second lens 130 and be transmitted to the outside world, thereby forming white light illumination. However, in other embodiments, the first light beam 152 and the second light beam 112 may also be light beams of other colors or wavelengths. For example, the first light beam 152 may also be ultraviolet light, and the second light beam 112 may be white light.

[0032] In this embodiment, the first lens 120 and the second lens 130 may both be convex lenses. In one embodiment, the first lens 120 is a concave-convex lens, and the second lens 130 is a plano-convex lens. However, in other embodiments, the first lens 120 and the second lens 130 may also be other similar convex lenses, such as biconvex lenses. Alternatively, in other embodiments, the second lens 130 may also be a concave lens, and the types of the first lens 120 and the second lens 130 are not limited to the above.

[0033] Figure 2 FIG. 1 is a schematic diagram of the light path of a light source module according to another embodiment of the present invention. Figure 2 The light source module 100a of this embodiment is Figure 1 In the light source module 100a of the present embodiment, the light path turning element 140 has a reflecting surface 141 facing away from the second lens 130, and a light homogenizing element 142 is disposed on the reflecting surface 141, wherein the light homogenizing element 142 is, for example, a diffuser or a fly-eye lens.

[0034] In the present embodiment, the light source module 100a further includes another light emitting element 160, wherein the wavelength conversion unit 110a is disposed between the light emitting element 160 and the first lens 120, and is used to convert the light beam 162 emitted by the light emitting element 160 into a second light beam 112, wherein the wavelength of the second light beam 112 is different from the wavelength of the light beam 162 emitted by the light emitting element 160. Specifically, in the present embodiment, the light emitting element 160 is a light emitting diode chip, and the wavelength conversion unit 110a is a phosphor layer covering the light emitting diode chip.

[0035] Figure 3 FIG. 1 is a schematic diagram of the light path of a light source module according to another embodiment of the present invention. Figure 3 The light source module 100b of this embodiment is Figure 1 The light source module 100b of this embodiment is similar to the light source module 100 of the embodiment, and the main differences between the two are as follows: The light source module 100b of this embodiment includes a plurality of light emitting elements 150 for respectively emitting a plurality of first light beams 152, wherein the light path turning element 140 is used to turn the first light beams 152 to the wavelength conversion unit 110.

[0036] Figure 4 FIG. 1 is a schematic diagram of a light path of a light source module according to another embodiment of the present invention. Figure 4 The light source module 100c of this embodiment and Figure 1 The light source module 100c of the present embodiment is similar to the light source module 100, and the main differences between the two are described as follows. The light source module 100c of the present embodiment includes a plurality of light-emitting elements 150 and a plurality of light path turning elements 140, wherein the light-emitting elements 150 are used to respectively emit a plurality of first light beams 152, and the light path turning elements 140 are used to respectively turn the first light beams 152 to the wavelength conversion unit 110. In the present embodiment, the configuration positions of the light path turning elements 140 include positions on opposite sides of the optical axis A1 of the first lens 120, and the configuration positions of the light-emitting elements 150 include positions on opposite sides of the optical axis A1 of the first lens 120. In other embodiments, the light-emitting elements 150 may also be symmetrically arranged relative to the optical axis; the light path turning elements 140 are also symmetrically arranged relative to the optical axis, for example, equally distributed on the circumference of the same radius of the surface 132 of the second lens 130.

[0037] Figure 5 FIG. 1 is a schematic diagram of the light path of a light source module according to another embodiment of the present invention. Figure 5 The light source module 100d of this embodiment is Figure 1 In the light source module 100d of this embodiment, the surface 132 of the second lens 130 facing the first lens 120 also faces the light path turning element 140, and there is a distance between the light path turning element 140 and the second lens 130.

[0038] Figure 6 FIG. 1 is a schematic diagram of the light path of a light source module according to another embodiment of the present invention. Figure 6 The light source module 100e of this embodiment is Figure 1 The light source module 100e of the present embodiment is similar to the light source module 100 of the present embodiment, and the main differences between the two are as follows. The light source module 100e of the present embodiment further includes a light valve 170, which is disposed on the path of the second light beam 112 from the second lens 130 and is used to convert the second light beam 112 into an image beam 172, wherein the light valve 170 is, for example, a digital micro-mirror device (DMD).

[0039] In the present embodiment, the light source module 100e further includes a concave mirror 180, which is disposed on the path of the second light beam 112 from the second lens 130 and is used to reflect the second light beam 112 to the light valve 170. In addition, in the present embodiment, the light source module 100e further includes a lens 190, which is disposed on the path of the image light beam 172 from the light valve 170 and is used to project the image light beam 172 to the outside world to provide lighting for the outside world. The light source module 100e is a headlight, such as an adaptive driving beam (ADB), that is, the image light beam 172 is changed by the light valve 170 to form different lighting areas, patterns or texts, or the image light beam 172 can be projected to a distance by the lens 190. The lens 190 may include at least one lens 192, and Figure 6 The figure below takes multiple lenses as an example.

[0040] In other embodiments, Figures 2 to 5 The front of the second lens 130 of the light source modules 100a to 100d is as Figure 6 The light valve 170 and the lens 190 are arranged as shown in FIG. Figure 6 The concave mirror 180) can be used to form other variant embodiments of the adaptive headlight.

[0041] In summary, in the light source module of the embodiment of the present invention, the light path turning element is arranged beside the second lens and is not located on the optical axis of the first lens, and the first light beam is sequentially turned by the light path turning element and penetrates the first lens to be transmitted to the wavelength conversion unit, while the second light beam sequentially penetrates the first lens and the second lens. Therefore, through such a design, the effect of separating the light paths of the first light beam and the second light beam can be achieved with a smaller space, and a color separation mirror that takes up space can be omitted in front of the first lens and the second lens. Therefore, the light source module of this embodiment can have a smaller volume and lower cost.

[0042] 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: wavelength conversion unit; A first lens is disposed in front of the wavelength conversion unit; A second lens is disposed in front of the first lens; An optical path turning element is disposed beside the second lens and is not located on the optical axis of the first lens; as well as The light-emitting element is disposed beside the first lens and is used to emit a first light beam, wherein the first light beam is sequentially deflected by the light path deflection element and penetrates the first lens and is transmitted to the wavelength conversion unit. The wavelength conversion unit is used to convert the first light beam into a second light beam. The wavelength of the first light beam is different from that of the second light beam. The second light beam sequentially penetrates the first lens and the second lens.

2. The light source module according to claim 1, characterized in that: The first light beam emitted by the light emitting element is transmitted to the light path turning element in a space on a side of the first lens away from the optical axis, and the first light beam turned by the light path turning element is incident on the first lens obliquely.

3. The light source module according to claim 1, characterized in that: The optical path turning element has a reflecting surface facing away from the second lens, and a light uniformizing element is also arranged on the reflecting surface.

4. The light source module according to claim 3, characterized in that: The light homogenizing element is a diffuser or a fly-eye lens.

5. The light source module according to claim 1, characterized in that: The surface of the second lens facing the first lens also faces the light path turning element, and there is a distance between the light path turning element and the second lens; or, The light path turning element is disposed on the surface of the second lens facing the first lens.

6. The light source module according to claim 1, characterized in that: Another light-emitting element is also included, wherein the wavelength conversion unit is configured between the other light-emitting element and the first lens, and is used to convert the light beam emitted by the other light-emitting element into the second light beam, the wavelength of the second light beam is different from the wavelength of the light beam emitted by the other light-emitting element.

7. The light source module according to claim 6, characterized in that: The other light emitting element is a light emitting diode chip, and the wavelength conversion unit is a phosphor layer covering the light emitting diode chip.

8. The light source module according to claim 1, characterized in that: It comprises a plurality of light emitting elements for respectively emitting a plurality of first light beams, wherein the light path turning element is used for turning the plurality of first light beams to the wavelength conversion unit.

9. The light source module according to claim 1, characterized in that: It comprises a plurality of the light emitting elements and a plurality of the light path turning elements, wherein the plurality of the light emitting elements are used to respectively emit a plurality of the first light beams, and the plurality of the light path turning elements are used to respectively turn the plurality of the first light beams to the wavelength conversion unit.

10. The light source module according to claim 1, characterized in that: The configuration positions of the plurality of light path turning elements include positions on two opposite sides of the optical axis of the first lens, and the configuration positions of the plurality of light emitting elements include positions on two opposite sides of the optical axis of the first lens.

11. The light source module according to claim 1, characterized in that: The wavelength conversion unit is a fluorescent powder layer or a fluorescent rotating wheel.

12. The light source module according to claim 1, characterized in that: The invention also comprises a light valve, which is arranged on the path of the second light beam from the second lens and used for converting the second light beam into an image light beam.

13. The light source module according to claim 12, characterized in that: Also includes a concave mirror, which is disposed on the path of the second light beam from the second lens and is used to reflect the second light beam to the light valve; or, It also includes a lens, which is arranged on the path of the image light beam from the light valve and is used to project the image light beam to the outside, wherein the light source module is a headlight.

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