TW202121012A - Light source module including a light-emitting unit, a light collection unit, a light splitting device, and a light conversion unit - Google Patents

Abstract

A light source module of a projection equipment is disclosed. The main purpose and advantage of the light source module are to reduce the size of the projection equipment. The light source module includes a light-emitting unit, a light collection unit, a light splitting device, and a light conversion unit. The light-emitting unit includes a laser light source or a light-emitting diode (LED) light source for generating a first color light beam. The light collection unit includes a first optical axis and at least one first lens for collecting the source light incident to the light collection unit from the light-emitting unit or other elements. The light splitting device is arranged on the same area as the light collecting unit to reflect the first color light beam incident from the light-emitting unit to the light collecting unit. The light conversion unit includes a first plane substantially perpendicular to the first optical axis, and at least one wavelength conversion area for converting the first color light beam incident from the light splitting device to the at least one wavelength conversion area into at least one second color light beam which can be emitted substantially along the first optical axis.

Description

Light source module

The present invention relates to projection equipment, and particularly relates to a light source module for projection equipment.

According to US Patent No. 9,429,831, a projector light source system is disclosed. As shown in Figure 2 of the patent, the light source system must provide a specific space in the projector to accommodate the light splitting component 25A. Similarly, the projector light source system disclosed in the US Patent No. 10,571,788, as shown in FIG. 1 of the patent, must also provide a specific space in the projector to install the light splitting component 730. The main drawback of the aforementioned light source systems is that they increase the size of the projector, which is quite unfavorable for the miniaturization features required by modern designs. In other words, a light source system that can reduce the size of the projector has always been proposed.

The main purpose and advantage of a light source module for projection equipment disclosed in the present invention is to reduce the size of the projection equipment. The light source module includes a light emitting unit, a light collection unit, a light splitting device and a light conversion unit. The light-emitting unit includes a laser light source or a light-emitting diode (LED) light source for generating a first color light beam. The light collection unit includes a first optical axis, and at least one first lens for collecting the light source incident on the light collection unit from the light-emitting unit or other elements. The light splitting device and the light collecting unit are arranged on the same area and used for reflecting the first color light beam incident from the light emitting unit to the light collecting unit. The light conversion unit includes a first plane that intersects the first optical axis substantially perpendicularly, and at least one wavelength conversion area for converting the first color light beam incident from the light splitting device to the at least one wavelength conversion area into At least one second color light beam can be emitted substantially along the first optical axis.

Another feature of the present invention is that the first color beam of the light-emitting unit has a second optical axis, the second optical axis intersects the first optical axis at a predetermined angle, and the predetermined angle may be 0 degrees or less than 90 degrees .

Another feature of the present invention is that the light-emitting unit and the beam splitting device are located on the same side of the plane where the first optical axis is located.

Another feature of the present invention is that the spectroscopic device includes a spectroscopic coating, which is arranged on the first lens of the light collection unit. Furthermore, in a preferred embodiment, the first lens of the light collection unit may be a plano-convex lens, the plano-convex lens has a first light-incident surface and a first light-emitting surface, the light splitting device of the light splitting device The coating is arranged on a first part of the first light-emitting surface.

Another feature of the present invention is that the first light-emitting bread of the first lens contains a second part for transmitting the incident light beam. In addition, in practice, an anti-reflection coating (Anti Reflection Coating) can also be arranged on the second part. ).

Another feature of the present invention is that the light collection unit further includes a second lens arranged on the light exit path of the first lens. The second lens may also be a plano-convex lens with a second light incident surface, and a first lens. Two light-emitting surfaces; in implementation, the spectroscopic device includes a spectroscopic coating, and the spectroscopic coating is arranged on a first part of the second light-incident surface.

Another feature of the present invention is that the light collection unit further includes a second lens arranged on the light exit path of the first lens. The second lens is also a plano-convex lens with a second light incident surface, and a second lens. The light-emitting surface; the light-splitting device includes a beam splitting lens, which is arranged between the first light-emitting surface of the first lens and the second light-incident surface of the second lens.

Another feature of the present invention is that the light conversion unit further includes a heat dissipation substrate, and the wavelength conversion region is arranged on the heat dissipation substrate.

Another feature of the present invention is that the light conversion unit further includes a rotatable wheel-shaped heat dissipation substrate, the wavelength conversion area is arranged on the wheel-shaped heat dissipation substrate, and includes a first wavelength conversion portion and a second wavelength The conversion part is used to enable each of the wavelength conversion parts to enter the transmission path of the first light beam in turn to perform wavelength conversion.

Another feature of the present invention is that the light conversion unit further includes a rotatable wheel-shaped heat dissipation substrate, and the wavelength conversion area is arranged on the wheel-shaped heat dissipation substrate, and includes a first wavelength conversion portion and a second wavelength conversion portion. Part, and a reflection area for making each of the wavelength conversion parts and the reflection area take turns into the transmission path of the first light beam to perform light wavelength conversion and reflection.

Another feature of the present invention is that the light conversion unit further includes a rotatable wheel-shaped heat dissipation substrate, and the wavelength conversion area is arranged on the wheel-shaped heat dissipation substrate, and includes a first wavelength conversion portion and a second wavelength conversion portion. Part, and a transmission area for making each of the wavelength conversion parts and the transmission area enter the transmission path of the first light beam in turn to perform light wavelength conversion and transmission.

First, referring to Figures 1 and 2, the light source module of the first preferred embodiment of the present invention, as shown in Figure 10, includes a light emitting unit 12, a light collecting unit 14, a light splitting device 16, and a light Conversion unit 18.

The light emitting unit 12 can generally be a laser light source or a light emitting diode (LED) light source for generating a first color light beam. In this embodiment, it is a laser light source and generates a blue light beam 20. The light collection unit 14 may have only one lens for collecting, such as collimating and condensing, the excitation beam emitted by the light conversion unit 18 or the light source emitted by the light-emitting unit 12. The light splitting device 16 and the light collecting unit 14 may be arranged in the same area. In this embodiment, the light collection unit 14 has a first plano-convex lens 22, a second plano-convex lens 24, and a biconvex aspheric lens 26 arranged in sequence. The beam splitting device 16 is arranged on the surface of the first plano-convex lens 22. The light conversion unit 18 has a heat dissipation substrate 28 and a wavelength conversion area 30 arranged on the heat dissipation substrate 28.

In more detail, as shown in FIG. 1, the light conversion unit 18 has a first plane X, and the relative positions of the components in this embodiment are described based on the first plane X. The light source module 10 has a first optical axis Y substantially perpendicular to the first plane X. The blue light beam 20 emitted by the light-emitting unit 12 has a second optical axis BL1, the second optical axis BL1 intersects the first optical axis Y at a predetermined angle θ, the angle θ may be 0 degrees or less than 90 degrees In this embodiment, the angle θ is about 30 degrees. The first plano-convex lens 22, the second plano-convex lens 24 and the biconvex aspheric lens 26 of the light collection unit 14 are coaxially arranged. The first plano-convex lens 22 has a first light-incident surface 23 and a first light-emitting surface 25. In this embodiment, as shown in FIG. 2, the first light-emitting surface 25 has a first portion 27 and a second portion 29. In this embodiment, the spectroscopic device 16 is a spectroscopic coating 17 disposed on the first part 27, and the second part 29 is disposed with an anti-reflection coating (Anti Reflection Coating) 19. In addition, in this embodiment, the light-emitting unit 12 and the spectroscopic coating 17 are also located on the left side of a second plane S where the first optical axis Y is located. The area of the first portion 27 may be less than or equal to 50% of the entire surface area of the first light-emitting surface 25.

The wavelength conversion area 30 is provided with a first fluorescent stimulus material for converting the blue light beam 20 reflected by the beam splitting device 16 to the wavelength conversion area 30 into a red light beam, a green light beam or a yellow light beam. Furthermore, when the blue light beam 20 enters the light collection unit 14, it will be reflected by the beam splitting device 16 and condensed into a light spot on the wavelength conversion area 30 to generate an excitation light beam L2 of a different wavelength, and then transmit the light. The collection unit 14 is transmitted to the back-end device.

Please refer to FIG. 3, the light source module of the second preferred embodiment of the present invention is shown in figure 10'. The difference between the light source module 10' and the light source module 10 of the first embodiment lies in the light emitting unit 12' The second optical axis BL1' of the emitted blue light beam 20' is parallel to the first optical axis Y. The blue light beam 20' is reflected by the beam splitting device 16' to generate an excitation light beam L2' in the wavelength conversion region 30.

Please refer to FIG. 4, the light source module of the third preferred embodiment of the present invention is shown in figure 10". The difference between the light source module 10" and the light source module 10 of the first embodiment lies in the light splitting device 16" It is arranged on the second light-incident surface 240" of the second plano-convex lens 24". The figure BL1" shows the second optical axis of the blue light beam 20" emitted by the light-emitting unit 12". The drawing number L2" shows the excitation light beam generated by the wavelength conversion region 30" being excited by the blue light beam 20".

Please refer to FIG. 5, the light source module of the fourth preferred embodiment of the present invention is shown as figure 100. The light source module 100 includes a light emitting unit 102, a light collecting unit 104, a light splitting device 106, and a light conversion Unit 108. The light collection unit 104 has a first plano-convex lens 110, a second plano-convex lens 112, and a biconvex aspheric lens 114 arranged in sequence. The light source module 100 is different from the light source module 10 of the first embodiment in that the beam splitting device 106 is a beam splitting lens, and the beam splitting lens 106 is arranged on the first light emitting surface 1100 of the first plano-convex lens 110 and the first Between the second light incident surfaces 1120 of the two plano-convex lenses 112. The figure BL10 shows the second optical axis of the blue light beam 1020 emitted by the light-emitting unit 102. The drawing number L20 shows the excitation light beam generated by the light conversion unit 108 being excited by the blue light beam 1020.

6 and 7, the light source module of the fifth preferred embodiment of the present invention is shown as figure 200. The light source module 200 includes a light emitting unit 202, a light collecting unit 204, a light splitting device 206, and A light conversion unit 208. The light collection unit 204 has a first plano-convex lens 210, a second plano-convex lens 212, and a biconvex aspheric lens 214 arranged in sequence. The difference between the light source module 200 and the light source module 10 of the first embodiment is that the light conversion unit 208 includes a wheel-shaped heat dissipation substrate 216 and a wavelength conversion area 218. The wheel-shaped heat dissipation substrate 216 is driven by a motor 220, and the wavelength conversion area 218 is arranged on the wheel-shaped heat dissipation substrate 216. In this embodiment, as shown in FIG. 7, the wavelength conversion region 218 has a ring shape. The blue light beam 224 of the light emitting unit 202 is reflected to the wavelength conversion region 218 by the light splitting device 206 to generate an excitation light beam 226. The excitation beam 226 transmits through the light collection unit 204 to the back-end device.

Please refer to FIGS. 8 and 9, a light source module according to a sixth preferred embodiment of the present invention is shown as figure 300. The light source module 300 includes a light emitting unit 302, a light collecting unit 304, a light splitting device 306, and A light conversion unit 308. The light collection unit 304 has a first plano-convex lens 310, a second plano-convex lens 312, and a double-convex aspheric lens 314 arranged in sequence. The light source module 300 is different from the light source module 200 of the fifth embodiment, as shown in FIG. 9, in that the wavelength conversion area 318 arranged on the heat dissipation substrate 316 of the light conversion unit 308 has a first wavelength conversion portion 320 , And a second wavelength conversion portion 322, the heat dissipation substrate 316 further has a reflection area 324. Thereby, when the wheel-shaped heat dissipation substrate 316 rotates, the blue light beam 328 reflected by the beam splitter 306 will be incident on the first wavelength conversion portion 320, the second wavelength conversion portion 322, and the reflection area in turn. 324. In this embodiment, as shown in FIG. 9, the reflective area 324 is flat. When the blue light beam 328 is reflected by the beam splitting device 306 and incident on the first wavelength conversion part 320, a first excitation beam L1 is generated, and when the blue beam 328 is reflected by the beam splitting device 306 and is incident on the second wavelength conversion part 320, The wavelength conversion part 322 generates a second excitation light beam L2, and when the blue light beam 328 is reflected by the beam splitter 306 and enters the reflection area 324, a reflected light beam L3 is generated.

Please refer to FIG. 10 again. The light source module of the seventh embodiment of the present invention has a light conversion unit 400 different from that of the sixth preferred embodiment. The heat dissipation substrate 402 of the light conversion unit 400 is also provided with a wavelength conversion area 404. The wavelength conversion area 404 has a first wavelength conversion portion 406 and a second wavelength conversion portion 408. In addition, the heat dissipation substrate 402 further has a reflective area 410. In this embodiment, the reflective area 410 is inclined to adjust the direction of the light beam reflected by it.

Referring to FIGS. 11 and 12, the light source module of the eighth preferred embodiment of the present invention has a light conversion unit 500 different from that of the seventh preferred embodiment. A wavelength conversion area 504 is arranged on the heat dissipation substrate 502 of the light conversion unit 500. The wavelength conversion area 504 has a first wavelength conversion portion 506 and a second wavelength conversion portion 508. In addition, the heat dissipation substrate 502 further has a hollow transmission area 510. When the blue light beam 512 is reflected by the beam splitter 514 and enters the transmission area 510, a transmitted light beam L4 is generated. Please refer to FIG. 13 again. In another embodiment, the hollow transmission area 510 can be inlaid with a transmission flat lens 516. Alternatively, a transmissive diffuser lens can also be embedded in the hollow transmissive area 510 to produce transmissive and scattering effects.

In addition, it must be mentioned that, in some embodiments of the present invention, a diffusion unit may be provided in the light path between the light-emitting unit and the light-collecting unit to make the light beam provided by the light-emitting unit available. The uniformity of the light spot converged in the wavelength conversion region is improved. Or, in the light path between the light-emitting unit and the light-collecting unit, an array lens unit may be provided to improve the uniformity of the spot converged by the light beam provided by the light-emitting unit in the wavelength conversion area.

10,10’,10”: Light source module 12,12’,12”: Light-emitting unit 14: Light collection unit 16,16’,16”: Spectroscopic device 17: Spectroscopic coating 18: Light conversion unit 19: Anti-reflective coating 20,20’,20”: blue beam 22: The first plano-convex lens 23: The first light-incident surface 24,24”: The second plano-convex lens 25: The first glossy surface 26: Double convex aspheric lens 27: Part One 28: Heat sink substrate 29: Part Two 30, 30": wavelength conversion area 100: light source module 102: light-emitting unit 104: light collection unit 106: Spectroscopic device 108: light conversion unit 110: The first plano-convex lens 112: second plano-convex lens 114: Double convex aspheric lens 1020: Blue beam 1100: First Glossy Surface 1120: The second light incident surface 200: light source module 202: light-emitting unit 204: light collection unit 206: Spectroscopic device 208: light conversion unit 210: The first plano-convex lens 212: second plano-convex lens 214: Double convex aspheric lens 216: Wheel-shaped heat sink substrate 218: wavelength conversion area 220: Motor 224: Blue beam 226: Excitation beam 240": the second light-incident surface 300: light source module 302: light-emitting unit 304: light collection unit 306: Spectroscopic device 308: optical conversion unit 310: The first plano-convex lens 312: second plano-convex lens 314: Double convex aspheric mirror 316: heat sink substrate 318: wavelength conversion area 320: The first wavelength conversion section 322: The second wavelength conversion section 324: reflection area 328: Blue beam 400: Optical conversion unit 402: heat sink substrate 404: wavelength conversion area 406: The first wavelength conversion section 408: Second wavelength conversion section 410: reflection area 500: light conversion unit 502: heat sink substrate 504: wavelength conversion area 506: The first wavelength conversion section 508: Second wavelength conversion section 510: Transmission area 512: Blue beam 514: Spectroscopic device 516: flat lens BL1, BL1’, BL1”, BL10: second optical axis L1, L2, L2’, L2”, L20: Excitation beam L3: reflected beam L4: transmitted beam S: second plane X: first plane Y: first optical axis θ: Angle

Hereinafter, several embodiments and drawings are used to describe the technical features disclosed in the present invention in more detail, among which: Fig. 1 is a schematic diagram of a light source module according to a first preferred embodiment of the present invention; 2 is a schematic diagram of a plano-convex lens of the light source module according to the first preferred embodiment of the present invention is provided with a spectroscopic coating and an anti-reflection coating; Fig. 3 is a schematic diagram of a light source module according to a second embodiment of the present invention; 4 is a schematic diagram of a light source module according to a third embodiment of the invention; Fig. 5 is a schematic diagram of a light source module according to a fourth embodiment of the present invention; Fig. 6 is a schematic diagram of a light source module according to a fifth embodiment of the present invention; Fig. 7 is a top view of a light conversion unit of a light source module according to a fifth embodiment of the present invention; Fig. 8 is a schematic diagram of a light source module according to a sixth embodiment of the present invention; Fig. 9 is a perspective view of a light conversion unit of a light source module according to a sixth embodiment of the present invention; 10 is a perspective view of a light conversion unit of a light source module according to a seventh embodiment of the present invention; Fig. 11 is a schematic diagram of a light source module according to an eighth embodiment of the present invention; 12 is a perspective view of the light conversion unit of the light source module according to the eighth embodiment of the present invention; and FIG. 13 is a perspective view of a light conversion unit of a light source module according to a ninth embodiment of the present invention.

10: Light source module

12: Light-emitting unit

14: Light collection unit

16: Spectroscopic device

18: Light conversion unit

20: Blue beam

22: The first plano-convex lens

23: The first light-incident surface

24: second plano-convex lens

25: The first glossy surface

26: Double convex aspheric lens

28: Heat sink substrate

30: Wavelength conversion area

BL1: second optical axis

L2: Excitation beam

X: first plane

Y: first optical axis

θ: Angle

Claims (21)

A light source module, including: A light emitting unit for generating a first color light beam; A light collection unit including a first optical axis, and at least one first lens for collecting light sources incident on the light collection unit; A beam splitting device arranged on the same area as the light collecting unit for reflecting the first color light beam incident from the light emitting unit to the light collecting unit; and A light conversion unit includes a first plane that intersects substantially perpendicularly to the first optical axis, and at least one wavelength conversion area for converting the first color light beam incident from the light splitting device into a light beam that can be substantially along the first At least one second color light beam emitted from the optical axis. The light source module according to claim 1, wherein the light emitting unit includes a laser light source or a light emitting diode (LED) light source. The light source module according to claim 1, wherein the first light beam has a second optical axis, the second optical axis intersects the first optical axis at a predetermined angle, and the predetermined angle may be 0 degrees or less than 90 degree. The light source module according to claim 1, wherein the first lens is a first plano-convex lens, the first plano-convex lens has a first light-incident surface and a first light-emitting surface, and the light splitting device includes a light splitting coating , The spectroscopic coating is arranged on a first part of the first light-emitting surface. The light source module according to claim 4, wherein the first light-emitting bread of the first plano-convex lens includes a second part, and the second part is provided with an anti-reflection coating. The light source module according to claim 4, wherein the area of the first part of the first light-emitting surface is less than or equal to 50% of the entire area of the first light-emitting surface. The light source module according to claim 1, wherein the first lens is a first plano-convex lens, the first plano-convex lens has a first light-incident surface and a first light-emitting surface; the light collection unit further includes a A second lens arranged on the light exit path of the first lens. The second lens is a second plano-convex lens with a second light entrance surface and a second light exit surface. The light splitting device includes a light splitting coating. The coating is arranged on a first part of the second light incident surface of the second plano-convex lens. The light source module according to claim 1, wherein the first lens is a first plano-convex lens, the first plano-convex lens has a first light-incident surface and a first light-emitting surface; the light collection unit further includes a A second lens arranged on the light exit path of the first lens. The second lens is a second plano-convex lens with a second light incident surface and a second light exit surface. The beam splitting device includes a beam splitting lens and is arranged Between the first light-emitting surface of the first plano-convex lens and the second light-incident surface of the second plano-convex lens. According to the light source module of claim 7 or 8, the light collecting unit further includes a third lens arranged on the light exit path of the second lens, and the third lens is a biconvex aspheric lens. The light source module according to claim 1, wherein the light conversion unit further includes a heat dissipation substrate, and the wavelength conversion area is arranged on the heat dissipation substrate. The light source module according to claim 10, wherein the wavelength conversion region includes a first fluorescent excited material. The light source module according to claim 1, wherein the light conversion unit further includes a rotatable heat dissipation substrate, and the wavelength conversion area is arranged on the heat dissipation substrate. According to the light source module of claim 12, the wavelength conversion area includes a first wavelength conversion portion and a second wavelength conversion portion. The light source module according to claim 12, wherein the heat dissipation substrate further includes a reflection area for reflecting the incident first color light beam. The light source module according to claim 12, wherein the heat dissipation substrate further includes a transmission area for transmitting the incident first color light beam. The light source module according to claim 14, wherein the reflection area is inclined. The light source module according to claim 15, wherein the transmission area is hollow. The light source module according to claim 17, wherein the transmission area is inlaid with a transmission type diffuser lens. The light source module according to claim 17, wherein the transmissive area is inlaid with a transmissive flat lens. For example, the light source module of claim 1, further comprising a diffusion unit, which is arranged in the light path between the light emitting unit and the light collecting unit, so that the light beam provided by the light emitting unit can be condensed in the wavelength conversion area The resulting spot is improved in uniformity. For example, the light source module of claim 1, further comprising an array lens unit, which is arranged in the light path between the light emitting unit and the light collecting unit, so that the light beam provided by the light emitting unit can be in the wavelength conversion area. The convergent spot is improved in uniformity.

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