TWI734621B - Light source module - Google Patents

Abstract

A light source module for projection equipment, the main purpose and advantage of which 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, a first lens, and a second lens. The second lens is arranged on the light exit path of the first lens to collect incident light from the light emitting unit or other elements to the The light source of the light collection unit. The beam splitting device is arranged between the first light incident surface of the first lens and the second light exit surface of the second lens for reflecting the first color light beam incident from the first light incident surface and causing the reflected light The first color light beam is emitted from the first light incident surface of the first lens. The light conversion unit includes a first plane substantially perpendicular to the first optical axis, and at least one wavelength conversion area for receiving the first color light beam reflected from the light splitting device and converting it into a substantially At least one second color light beam emitted 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 for collimating and condensing the light source incident from the light emitting unit or other elements, a first lens and a second lens, and the second lens is arranged on the first lens. In the light exit path of the lens, the first lens has a first light entrance surface and a first light exit surface, and the second lens has a second light entrance surface, And a second light-emitting surface, wherein the first light-emitting surface is adjacent to the second light-incident surface, and the first color light beam is incident to the light collection unit from the first light-incident surface. The beam splitting device is arranged between the first light-incident surface of the first lens and a second light-emitting surface of the second lens to reflect the first color light beam incident from the first light-incident surface and be reflected The first color light beam is emitted from the first light incident surface of the first lens. The light conversion unit includes a first plane substantially perpendicular to the first optical axis, and at least one wavelength conversion area for receiving the first light beam reflected from the light splitting device and converting it into a At least one second color light beam emitted from 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 having a flat first light incident surface and a convex arc-shaped first light output Surface, the spectroscopic coating of the spectroscopic device 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 flat A second light-incident surface and a convex arc-shaped second light-emitting surface; 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 flat second light incident surface. And a convex arc-shaped second light-emitting surface; the light splitting device includes a dichroic lens 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.

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: second light incident surface

242: Second Glossy Surface

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

The following is a more detailed description of the technical features disclosed in the present invention with several embodiments and accompanying drawings. Among them: FIG. 1 is a schematic diagram of a light source module according to a first preferred embodiment of the present invention; FIG. 2 is a first embodiment of the present invention. A schematic diagram of a plano-convex lens of a light source module of a preferred embodiment with a spectroscopic coating and an anti-reflection coating; FIG. 3 is a schematic diagram of the light source module of the second embodiment of the present invention; FIG. 4 is the third embodiment of the present 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 light source module according to the fifth embodiment of the present invention The top view of the light conversion unit of the module; FIG. 8 is a schematic diagram of the light source module of the sixth embodiment of the present invention; FIG. 9 is a three-dimensional view of the light conversion unit of the light source module of the sixth embodiment of the present invention; A three-dimensional view of the light conversion unit of the light source module according to the seventh embodiment of the present invention; FIG. 11 is a schematic diagram of the light source module of the eighth embodiment of the present invention; FIG. 12 is the light conversion unit of the light source module according to the eighth embodiment of the present invention Perspective view; 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.

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 flat first light-incident surface 23 and a convex arc-shaped first light-emitting surface 25, and the second plano-convex lens 24 has a flat second light-incident surface 240, And a convex arc-shaped second light-emitting surface 242. 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 light splitting device 16 is a light splitting coating 17 disposed on the first portion 27. , The second part 29 is provided 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, a light source module according to a fourth preferred embodiment of the present invention is shown in 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 converting unit. 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 drawing number BL10 shows the blue light beam emitted by the light-emitting unit 102 The second optical axis of 1020. 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, a light source module according to a fifth preferred embodiment of the present invention is shown in 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 in 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 splitter 306 When the blue light beam 328 is reflected by the beam splitter 306 and enters the second wavelength conversion portion 322, a second excitation light beam L1 will be generated. The light beam L2 generates a reflected light beam L3 when the blue light beam 328 is reflected by the beam splitter 306 and enters the reflection area 324.

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 for The uniformity of the spot converged by the light beam provided by the light-emitting unit in the wavelength conversion area is improved.

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

240: The first light-incident surface

242: Second Glossy Surface

BL1: second optical axis

L2: Excitation beam

X: first plane

Y: first optical axis

θ: Angle

Claims (21)

A light source module includes: a light emitting unit for generating a first color light beam; a light collecting unit for collimating and condensing a light source incident from the light emitting unit or other elements, the light collecting unit including There is a first optical axis, a first lens and a second lens. The second lens is arranged on the light exit path of the first lens. The first lens has a first light incident surface and a first light exit surface , The second lens has a second light entrance surface and a second light exit surface, wherein the first light exit surface is adjacent to the second light entrance surface, and the first color light beam is incident from the first light entrance surface To the light collection unit; a beam splitting device is arranged between the first light-incident surface of the first lens and a second light-emitting surface of the second lens to reflect the incident from the first light-incident surface The first color light beam and the reflected first color light beam are emitted from the first light incident surface of the first lens; and a light conversion unit including a first plane that intersects substantially perpendicularly to the first optical axis, and At least one wavelength conversion area is used to receive the first light beam reflected from the light splitting device and convert it into at least one second color light beam that can be emitted substantially along the first 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 color beam has a second optical axis, and 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. The light source module according to claim 1, wherein the first lens is a first plano-convex lens, and the first plano-convex lens has a flat first light incident surface and a convex arc-shaped first output The light-splitting device includes a light-splitting coating, and the light-splitting 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, and the first plano-convex lens has a flat first light-incident surface and a convex arc-shaped first light-emitting surface The light collection unit further includes a second lens arranged on the light exit path of the first lens, the second lens is a second plano-convex lens, has a flat second light incident surface, and a convex arc The second light emitting surface, the light splitting device includes a light splitting coating, and the light splitting 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, and the first plano-convex lens has a flat first light-incident surface and a convex arc-shaped first light-emitting surface The light collection unit further includes a second lens arranged on the light exit path of the first lens, the second lens is a second plano-convex lens, has a flat second light incident surface, and a convex arc The second light-emitting surface, the light splitting device includes a light-splitting lens, which 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 collection 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.

Images