TWI703398B - Projector - Google Patents

Abstract

A projector includes a light source module, a collimating lens, a dichroic mirror and a wavelength conversion module. The light source module is configured to provide an illumination beam. The collimating lens is configured to collimating the illumination beam. The collimating lens includes a first part and a second part, and an axle positioned between the first part and the second part. The wavelength conversion module is configured to receive the illumination beam from the first part, and further to generate an excitation beam transmitted toward the first part and the second part. The dichroic mirror is disposed on a position corresponding to the first part. The dichroic mirror is configured to reflect the illumination beam toward the first part and be passed by the excitation beam, or further configured to be passed by the illumination beam and reflect the illumination beam.

Description

Projector

The invention provides a projector, especially a laser projector with fewer components, smaller volume and low cost.

For example, US Patent No. US 9618737B2, laser projectors generally use blue laser sources to provide illumination beams. The illuminating beam needs to be converted into a laser beam of other colors through a wavelength conversion device (such as a color wheel partially coated with phosphor/quantum dots), and then combined with the illuminating beam for use. The traditional light-combining module uses a beam splitter to reflect the illuminating light beam and project it to the color wheel. The color wheel has a wavelength conversion material to generate a received laser beam, and the received laser beam can directly penetrate the beam splitter. In addition, part of the illuminating light beam will pass through the color wheel without wavelength conversion material, and return to the beam splitter through multiple reflectors, and be reflected by the beam splitter to combine with the received laser beam. From this, it can be seen that the traditional light combination module needs to be equipped with a variety of optical components, which not only greatly increases the hardware cost, but also increases the weight and volume of the product.

The present invention provides a projector with fewer components, smaller volume and low cost to solve the above-mentioned problems.

The scope of patent application of the present invention discloses a projector which includes a light source module, a collimating lens, a light splitting element and a wavelength conversion module. The light source module provides an illumination beam. The collimating lens receives and transmits the illumination beam. The collimating lens has a first part and a second part, and an axis located between the first part and the second part. The wavelength conversion module is used for receiving the illumination beam from the first part and generating a received laser beam to the first part and the second part. The light splitting element is arranged opposite to the first part. The light splitting element is used for reflecting the illuminating beam to the first part and allowing the penetrating laser beam, or the light splitting element allows the illuminating beam to penetrate and reflecting the penetrating laser beam.

The patent application scope of the present invention further discloses that when the beam splitting element is used to reflect the illuminating beam to the first part and allow the laser beam to penetrate, the projector further includes a light penetrating component connected to the beam splitting element and arranged Relative to the second part, both the illumination beam and the received laser beam penetrate the light penetrating component. The illuminating light beam is a blue light, and the light splitting element reflects the blue light and allows other colors to pass through. The received laser beam is a yellow light.

The patent application scope of the present invention also discloses that when the beam splitting element allows the illumination beam to penetrate and reflect the laser beam, the projector further includes a first reflector connected to the beam splitting element and arranged opposite to the second part, Used to reflect the illumination beam and the received laser beam. The illuminating beam is a blue light, and the light splitting element allows the blue light to penetrate and reflect other colors of light. The received laser beam is a yellow light.

The projector of the present invention utilizes a partially reflected illuminating beam and a wavelength conversion module that locally generates the received laser beam, and a beam splitting element opposite to the first part of the collimator lens, to form a light combining module with the least number of elements in a limited space To mix light. The spectroscopic element can have a variety of applications. For example, one of them reflects the illuminating beam and allows the laser beam to penetrate, and the other allows the illuminating beam to penetrate and reflects the laser beam. With different characteristics of light splitting elements, the configuration of the light source module, light splitting element and light pipe of the projector will also change accordingly.

10, 10’, 10”: projector

12: Light source module

14: Collimating lens

16: Spectroscopic element

18: Wavelength conversion module

20: Light penetrating parts

22: light pipe

24: The first condenser lens

26: The second condenser lens

28: diffuser

30: Part One

32: Part Two

34: Transparent substrate

36: The first area

38: second area

40: Coating

42: The first section

44: Second section

46: Wavelength conversion coating

48: second reflector

50: Projector

52: light source module

54: Collimating lens

56: Spectroscopic element

58: Wavelength conversion module

60: The first reflector

62: Light Pipe

64: The first condenser lens

66: The second condenser lens

68: Part One

70: Part Two

B1: Illumination beam

B2: by laser beam

Ax: axis

Figure 1 is a schematic diagram of a projector according to an embodiment of the invention.

FIG. 2 is a schematic diagram of the light splitting element and the light transmitting component according to the embodiment of the present invention.

Figure 3 is a schematic diagram of a wavelength conversion module according to an embodiment of the present invention.

Figure 4 is a schematic diagram of a projector according to another embodiment of the invention.

Figure 5 is a schematic diagram of a projector according to another embodiment of the invention.

Figure 6 is a schematic diagram of a projector according to another embodiment of the invention.

Fig. 7 is a diagram showing the relationship between the wavelength and the transmittance of the light splitting element according to the embodiment of the present invention.

Fig. 8 is a diagram showing the relationship between the wavelength and the transmittance of the light splitting element according to the embodiment of the present invention.

Please refer to FIG. 1 and FIG. 7. FIG. 1 is a schematic diagram of the projector 10 according to an embodiment of the present invention, and FIG. 7 is a diagram of the relationship between the wavelength and the transmittance of the light splitting element 16 according to the embodiment of the present invention. The light combining module of the projector 10 may include a light source module 12, a collimator lens 14, a light splitting element 16, a wavelength conversion module 18, a light penetrating component 20, a light pipe 22, a first condenser lens 24, and a second condenser lens. Optical lens 26 and diffuser 28; some of the aforementioned components can be optional accessories, which will be described later. The light source module 12 is used to provide an illumination light beam B1. The second condenser lens 26 is placed on the illumination path of the light source module 12 to converge the illumination beam B1 directed to the light splitting element 16, which means that the second condenser lens 26 can be arranged between the light source module 12 and the light splitting element 16. . The diffuser 28 is preferably arranged between the light source module 12 and the light splitting element 16 to diffuse the illuminating beam B1 so that the light intensity of the spot formed by the illuminating beam B1 can be more evenly distributed within its range; however, the diffuser 28 It can also be placed in other locations, depending on the design requirements.

The light splitting element 16 is used to reflect the illumination beam B1 to the collimating lens 14, so the light source module 12 and the collimating lens 14 are arranged on the same upper side/left side of the light splitting element 16, which means the -Z axis direction of the light splitting element 16, and The position of the light source module 12 relative to the light splitting element 16 does not overlap the position of the collimating lens 14 relative to the light splitting element 16; for example, the illumination path of the light source module 12 is not parallel to the light receiving path of the collimating lens 14. The collimator lens 14 can be divided into a first part 30 and a second part 32. The first part 30 and the second part 32 are separated by an axis Ax. The axis Ax can be the central axis of the collimating lens 14 or an optical axis at any other position, depending on the design requirements, and other changes will not be listed here. The position of the beam splitter 16 is relative to the first part 30, so the beam splitter 16 can reflect the illumination beam B1 to the first part 30 of the collimator lens 14.

The wavelength conversion module 18 and the beam splitting element 16 are respectively arranged on two opposite sides of the collimating lens 14. The illumination beam B1 penetrates the first part 30 of the collimator lens 14 and irradiates the wavelength conversion module 18. After the wavelength conversion module 18 receives the illumination beam B1 from the first part 30, it can partially reflect the illumination beam B1 to the second part 32, and locally generate a receiving beam that can pass through the first part 30 and the second part 32 at the same time. Laser beam B2. The illumination beam B1 and the received laser beam B2 that have passed through the collimator lens 14 are directed to the beam splitting element 16 and the light penetrating component 20. The light pipe 22 is arranged on the other lower side/right side of the beam splitting element 16 which is different from the collimating lens 14 and the wavelength conversion module 18, which means the +Z axis direction of the beam splitting element 16, and the first condensing lens 24 is set on the beam splitting element 16 Between element 16 and light pipe 22. The first condenser lens 24 can be used to converge the illumination beam B1 passing through the second part 32 and the laser beam B2 passing through the first part 30 and the second part 32; the light pipe 22 receives the illumination from the first condenser lens 24 The beam B1 and the received laser beam B2 guide them to other parts.

In this embodiment, the light-transmitting component 20 is connected to the light splitting element 16 and is arranged at a position relative to the second part 32. The optical characteristics of the light splitting element 16 are shown in Fig. 7, which can be used to reflect colored light in a specific wavelength range and allow light beams in other wavelength ranges to pass through; the light penetrating component 20 allows light beams in all wavelength ranges to pass through. For example, if the illuminating beam is blue, the illuminating beam B1 (blue light, with a wavelength of about 450~495nm) is reflected by the light splitting element 16 to the wavelength conversion module 18. The wavelength conversion module 18 locally responds to the laser beam B2 generated by the illuminating beam B1 as yellow light, and the received laser beam B2 (yellow light, with a wavelength of about 570~590nm) can simultaneously penetrate the beam splitting element 16 and the light penetrating component 20. The illumination beam B1 (blue light) partially reflected by the wavelength conversion module 18 only passes through the second part 32 and passes through the light penetrating component 20. Wherein, the light penetrating component 20 may optionally have an optical diffusion characteristic to diffuse the illuminating beam B1 and the receiving laser beam B2 so that the light intensity of the light spot in the projection range is uniformly distributed.

Please refer to FIGS. 2 and 3. FIG. 2 is a schematic diagram of the light splitting element 16 and the light transmitting member 20 according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of the wavelength conversion module 18 according to an embodiment of the present invention. As shown in FIG. 2, the projector 10 may have a transparent substrate 34. The light-transmitting substrate 34 is divided into a first area 36 and a second area 38, and the positions thereof are respectively opposite to the first part 30 and the second part 32 of the collimator lens 14. The first area 36 is covered with a coating 40 to form a beam splitting element 16 that can reflect light of a specific color and allow light of other colors to pass through. The second area 38 allows all colors of light to pass through, which means that the light passes through the component 20. The first area 36 and the second area 38 may be an integrally formed design, or two independent elements spliced together. As shown in FIG. 3, the wavelength conversion module 18 has a first section 42 and a second section 44. The first section 42 is made of a general light-reflecting material, and can reflect the illuminating beam B1 incident from the first part 30 to project it toward the second part 32. The second section 44 is provided with a wavelength conversion coating 46. The wavelength conversion coating 46 contains phosphors or quantum dots, so it can absorb the illuminating beam B1 to generate a received laser beam B2.

In this embodiment, the wavelength conversion module 18 is a rotatable color wheel, including a disc-shaped reflective material, such as an aluminum disc. The second section 44 is a C-shaped ring-shaped area on the disc-shaped reflective material, and the first section 42 is a gap of the C-shaped ring-shaped area. When the illumination beam B1 is reflected by the beam splitter 16 and penetrates the first part 30 of the collimator lens 14 to illuminate the high-speed rotating wavelength conversion module 18, the first section 42 directly reflects the illumination beam B1 to the collimator lens The second section 32 of 14, the second section 44 converts the illumination beam B1 to The laser beam B2 is received and transmitted to the first part 30 and the second part 32 of the collimating lens 14. In this way, the illuminating beam B1 and the received laser beam B2 can be mixed and converged by the first condenser lens 24, and the light pipe 22 guides the mixed beam to other components for supply.

Please refer to Fig. 4, which is a schematic diagram of a projector 10' according to another embodiment of the present invention. In this embodiment, the elements with the same number as the previous embodiment have the same structure and function, and the description will not be repeated here. The difference between the projector 10' and the previous embodiment is that the projector 10' does not connect the light transmitting member 20 beside the beam splitting element 16, which means that the projector 10' is only between the collimator lens 14 and the first condenser lens 24 , The light splitting element 16 is arranged relative to the first part 30 of the collimating lens 14. The beam splitter 16 reflects the illumination beam B1 so that the illumination beam B1 penetrates the first part 30 of the collimator lens 14 to the wavelength conversion module 18. The first section 42 of the wavelength conversion module 18 reflects the illumination beam B1, so that the illumination beam B1 sequentially penetrates the second part 32 of the collimator lens 14 and the first condenser lens 24; the second section of the wavelength conversion module 18 The laser beam B2 generated by the section 44 sequentially penetrates the collimator lens 14 (the first part 30 and the second part 32), the beam splitting element 16 and the first condenser lens 24, and is mixed with the illumination beam B1 and convergence.

Please refer to Figure 5. Figure 5 is a schematic diagram of a projector 10" according to another embodiment of the present invention. The projector 10" has the same components as the projector 10, but the difference lies in the light source module 12 of the projector 10" The light splitting element 16 is not opposed. In this embodiment, the projector 10 ″ may further include a second reflector 48 disposed on the illumination path of the light source module 12 to reflect the illumination beam B1 to the light splitting element 16. The second reflector 48 is provided to reduce the size of the light combining module and the projector 10". The positions and functions of other optical elements are as described in the previous embodiment, and will not be repeated. However, it is particularly mentioned that, The position of the second condenser lens 26 is not limited to that shown in Figure 5. It can be placed on the illumination path to converge the illumination beam B1 projected to the beam splitter 16 via the second reflector 48, or it can be placed on the second reflector. Between the component 48 and the light splitting element 16, the effect of converging the illuminating light beam B1 directed to the light splitting element 16 can also be achieved.

Please refer to FIGS. 6 and 8. FIG. 6 is a schematic diagram of a projector 50 according to another embodiment of the present invention, and FIG. 8 is a diagram of the relationship between the wavelength and the transmittance of the light splitting element 56 according to the embodiment of the present invention. The projector 50 includes a light source module 52, a collimator lens 54, a beam splitting element 56, a wavelength conversion module 58, a first reflector 60, a light pipe 62, a first condenser lens 64 and a second condenser lens 66. The second condenser lens 66 is disposed between the light source module 52 and the light splitting element 56. The wavelength conversion module 58 is disposed on the other side of the light splitting element 56 different from the light source module 52. The collimating lens 54 is located between the beam splitter 56 and the wavelength conversion module 58. The collimating lens 54 has a first part 68 and a second part 70; the beam splitting element 56 is arranged opposite to the first part 68, and the first reflector 60 is connected to the beam splitting element 56 and arranged opposite to the second part 70. The light pipe 62 and the wavelength conversion module 58 are arranged on the same upper side/left side of the light splitting element 56, which means the -Z axis direction of the light splitting element 56. The light receiving and light reflection paths of the wavelength conversion module 58 are not parallel to the light pipe 62 of the light receiving path. In addition, the light splitting element 56 of this embodiment also allows color light in a specific wavelength range (such as blue light) to pass through, and reflects color light in other wavelength ranges (such as yellow light).

As shown in FIG. 6, the light source module 52 provides an illuminating light beam B1, and the illuminating light beam B1 is converged by the second condenser lens 66 and projected to the light splitting element 56. The optical characteristics of the beam splitting element 56 are shown in Figure 8, allowing the illuminating beam B1 (such as blue light) to penetrate and reflect the laser beam B2 (such as yellow light), so the illuminating beam B1 sequentially passes through the beam splitting element 56 and is collimated The first part 68 of the lens 54 is to the wavelength conversion module 58. The wavelength conversion module 58 partially reflects the illumination beam B1 and penetrates the second part 70 of the collimator lens 54 to the first reflector 60, and also locally generates the laser beam B2 that penetrates the collimator lens 54 (the first part 68 and the The second part 70) is projected to the light splitting element 56 and the first reflector 60. The first reflector 60 reflects the illumination beam B1 and the received laser beam B2, and the beam splitter 56 reflects the received laser beam B2. Therefore, the illumination beam B1 and the received laser beam B2 are converged by the first condenser lens 64 to be projected to the light pipe 62.

In summary, the projector of the present invention utilizes a partially reflected illuminating beam and a wavelength conversion module that locally generates a received laser beam, and is matched with a beam splitting element opposite to the first part of the collimator lens, so as to achieve the minimum number of elements in a limited space. The combined light module for mixing light. The spectroscopic element can have a variety of applications. For example, one of them reflects the illuminating beam and allows the laser beam to penetrate, and the other allows the illuminating beam to penetrate and reflects the laser beam. With different characteristics of light splitting elements, the placement of the light source module, light splitting element and light pipe of the projector will also change accordingly.

The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention shall fall within the scope of the present invention.

10: Projector

12: Light source module

14: Collimating lens

16: Spectroscopic element

18: Wavelength conversion module

20: Light penetrating parts

22: light pipe

24: The first condenser lens

26: The second condenser lens

28: diffuser

30: Part One

32: Part Two

B1: Illumination beam

B2: by laser beam

Ax: axis

Claims (15)

A projector comprising: a light source module for providing an illuminating beam; a collimating lens for receiving and transmitting the illuminating beam; the collimating lens has a first part and a second part and is located at the first part An axis between part and the second part; a wavelength conversion module for receiving the illumination beam from the first part and generating a received laser beam to the first part and the second part ; A beam splitting element is arranged opposite the first part, the beam splitting element is used to reflect the illuminating beam to the first part and allow the laser beam to penetrate; and a light penetrating component connected to the beam splitting element and Relative to the second part, both the illuminating beam and the received laser beam penetrate the light penetrating component. The projector according to claim 1, wherein the axis is a central axis of the collimating lens. The projector according to claim 1, further comprising: a light-transmitting substrate arranged opposite to the first part and the second part, the light-transmitting substrate comprising: a first area covering a Coating to form the light splitting element; and a second region is the light penetrating part. The projector according to claim 1, wherein the light penetrating member has an optical diffusion characteristic for diffusing the illumination beam and the received laser beam. The projector according to claim 1, wherein the wavelength conversion module has a first section and A second section, the first section reflects the illumination beam incident from the first section to the second section, and the second section is provided with a wavelength conversion coating that receives the illumination beam and generates The laser beam. The projector according to claim 1, wherein the wavelength conversion coating contains phosphor or quantum dots. The projector according to claim 1, wherein the wavelength conversion module is rotatable. The projector according to claim 1, further comprising: a light pipe for receiving the laser beam from the first part and the second part and the illumination beam from the second part. The projector according to claim 8, further comprising: a first condensing lens arranged between the light splitting element and the light pipe for converging the illumination beam and the received laser beam. The projector according to claim 1, wherein the light source module is opposite to the light splitting element. The projector according to claim 1, further comprising: a second condensing lens arranged between the light source module and the light splitting element to converge the illuminating light beam directed to the light splitting element. The projector described in claim 1 additionally includes: A diffuser is arranged between the light source module and the light splitting element to diffuse the illumination beam. The projector according to claim 1, further comprising: a second reflector for reflecting the illumination beam to the light splitting element. The projector according to claim 1, wherein the illuminating beam is a blue light, and the light splitting element reflects the blue light and allows light of other colors to penetrate. The projector according to claim 1, wherein the received laser beam is a yellow light.

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