Wavelength conversion device and projection device

Abstract

A wavelength conversion device includes a rotating disc, a wavelength conversion material, a light-transmissive weight ring, a first adhesive layer, and at least one weight. The rotating disc has a central axis and rotates about the central axis. The wavelength conversion material is disposed on an outer edge of an upper surface of the rotating disc. The light-transmissive weight ring is disposed on the upper surface of the rotating disc. The light-transmissive weight ring includes a ring body and an outer protrusion. The outer protrusion is disposed on a surface of the ring body that is distal from the rotating disc. The first adhesive layer is disposed between the light-transmissive weight ring and the rotating disc. The at least one weight is disposed distal from the rotating disc from the light-transmissive weight ring. The at least one weight includes a weight and a light-cured material that covers the weight, wherein at least a portion of the light-cured material is located between the weight and the light-transmissive weight ring. In addition, a projection device is also provided. The wavelength conversion device and the projection device provided by the present application can improve the curing effect and structural strength of the light-cured material in the weight.

Description

Technical Field

[0001] This invention relates to an optical device and an electronic device, and more particularly to a wavelength conversion device and a projection device. Background Technology

[0002] A projection device is a display device used to generate images. The imaging principle of a projection device is to convert the illumination beam generated by the illumination system into an image beam through a light valve, and then project the image beam onto the projection target (such as a screen or wall) through a projection lens to form a projected image.

[0003] In lighting systems, the most cost-effective method for generating red and green light currently involves using a blue laser diode to emit an excitation beam to a phosphor wheel, which then excites the phosphors on the phosphor wheel to produce stimulated light. The desired red or green light is then filtered out by a filter element (phosphor wheel) for use. In known phosphor wheels, a metal ring is required to increase the wheel's weight, thereby optimizing the center of mass and improving dynamic balance.

[0004] However, if the weight imbalance of the fluorescent color wheel is significant, a metal sheet must be added to the metal ring to adjust the dynamic balance, for example, by incorporating a metal sheet into the adhesive. Due to the simplicity of the manufacturing process, the adhesive is always UV-curable. However, because the metal sheet itself is opaque, the UV-curable adhesive covering the bottom of the metal sheet may not receive sufficient UV light, preventing complete curing and causing concerns about the adhesion between the metal sheet and the metal ring.

[0005] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0006] This invention provides a wavelength conversion device and a projection device, which can improve the curing effect and structural strength of photocurable materials in counterweights.

[0007] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0008] To achieve one, some, or all of the above objectives, or other objectives, the present invention provides a wavelength conversion device, including a turntable, a wavelength conversion material, a light-transmitting counterweight ring, a first adhesive layer, and at least one counterweight. The turntable has a central axis and rotates about the central axis. The wavelength conversion material is disposed on the outer edge of the upper surface of the turntable. The light-transmitting counterweight ring is disposed on the upper surface of the turntable. The light-transmitting counterweight ring includes a ring body and an outer protrusion. The outer protrusion is disposed on the surface of the ring body away from the turntable. The first adhesive layer is disposed between the light-transmitting counterweight ring and the turntable. At least one counterweight is disposed on the light-transmitting counterweight ring away from the turntable. The at least one counterweight includes a weight and a photocurable material covering the weight, wherein at least a portion of the photocurable material is located between the weight and the light-transmitting counterweight ring.

[0009] To achieve one, some, or all of the above objectives, or other objectives, the present invention further provides a projection device, including an illumination system, at least one light valve, and a projection lens. The illumination system provides an illumination beam. The illumination system includes a wavelength conversion device. The wavelength conversion device includes a turntable, a wavelength conversion material, a light-transmitting counterweight ring, a first adhesive layer, and at least one counterweight. The turntable has a central axis and rotates about the central axis. The wavelength conversion material is disposed on the outer edge of the upper surface of the turntable. The light-transmitting counterweight ring is disposed on the upper surface of the turntable. The light-transmitting counterweight ring includes a ring body and an outer protrusion. The outer protrusion is disposed on the surface of the ring body away from the turntable. The first adhesive layer is disposed between the light-transmitting counterweight ring and the turntable. At least one counterweight is disposed on the light-transmitting counterweight ring away from the turntable. The at least one counterweight includes a weight and a photocurable material covering the weight, wherein at least a portion of the photocurable material is located between the weight and the light-transmitting counterweight ring. At least one light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is positioned in the path of the image beam to project the image beam out of the projection device.

[0010] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the wavelength conversion device and projection device of the present invention, a light-transmitting counterweight ring is disposed on a turntable, and at least one counterweight is disposed on the light-transmitting counterweight ring. The light-transmitting counterweight ring has a light-transmitting structure, and the counterweight includes a weight and a photocurable material covering the weight. Therefore, compared to the structure of a conventional wavelength conversion device, when manufacturing the counterweight, the wavelength conversion device can, through the light-transmitting characteristics of the light-transmitting counterweight ring and the reflection of the turntable, increase the light path of the curing beam irradiating the photocurable material from the side, obliquely downward, or downward. This improves the curing effect and structural strength of the photocurable material.

[0011] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0012] Figure 1This is a schematic diagram of a projection device according to an embodiment of the present invention.

[0013] Figure 2A This is a three-dimensional schematic diagram of the wavelength conversion device according to the first embodiment of the present invention.

[0014] Figure 2B This is a front view schematic diagram of a wavelength conversion device according to another embodiment of the present invention.

[0015] Figure 3 This is a cross-sectional schematic diagram of the wavelength conversion device according to the first embodiment of the present invention.

[0016] Figure 4 This is an exploded perspective view of the wavelength conversion device according to the first embodiment of the present invention.

[0017] Figure 5 This is a three-dimensional schematic diagram of the wavelength conversion device according to the second embodiment of the present invention.

[0018] Figure 6A This is a cross-sectional schematic diagram of the wavelength conversion device according to the second embodiment of the present invention.

[0019] Figure 6B This is a schematic diagram of the projection area of ​​the annular boss and the counterweight in the second embodiment of the present invention.

[0020] Figure 7 This is a three-dimensional exploded view of the wavelength conversion device according to the second embodiment of the present invention.

[0021] Figure 8 This is a three-dimensional schematic diagram of the wavelength conversion device according to the third embodiment of the present invention.

[0022] Figure 9 This is a cross-sectional schematic diagram of the wavelength conversion device according to the third embodiment of the present invention.

[0023] Figure 10 This is a three-dimensional exploded view of the wavelength conversion device according to the third embodiment of the present invention.

[0024] Figure 11 This is a three-dimensional schematic diagram of the wavelength conversion device according to the fourth embodiment of the present invention.

[0025] Figure 12 This is a cross-sectional schematic diagram of the wavelength conversion device according to the fourth embodiment of the present invention.

[0026] Figure 13 This is an exploded perspective view of the wavelength conversion device according to the fourth embodiment of the present invention.

[0027] Figure 14 This is a three-dimensional schematic diagram of the wavelength conversion device according to the fifth embodiment of the present invention.

[0028] Figure 15This is a cross-sectional schematic diagram of the wavelength conversion device according to the fifth embodiment of the present invention.

[0029] Figure 16 This is an exploded perspective view of the wavelength conversion device according to the fifth embodiment of the present invention. Detailed Implementation

[0030] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0031] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Please refer to... Figure 1 This embodiment provides a projection device 10, including an illumination system 50, at least one light valve 60, and a projection lens 70. The illumination system 50 provides an illumination beam LB. The at least one light valve 60 is disposed in the transmission path of the illumination beam LB to convert the illumination beam LB into an image beam LI. The projection lens 70 is disposed in the transmission path of the image beam LI and projects the image beam LI from the projection device 10 onto a projection target (not shown), such as a screen or wall.

[0032] The lighting system 50 is used to provide an illumination beam LB. For example, in this embodiment, the lighting system 50 is composed of a plurality of light-emitting elements, a wavelength conversion device 100, a light-diffusing element, a light-filtering element, and a plurality of light-splitting and combining elements, to provide light of different wavelengths to form the illumination beam LB. The plurality of light-emitting elements are, for example, light-emitting diodes (LEDs) or laser diodes (LDs). However, the present invention does not limit the type or form of the lighting system 50 in the projection device 10. Its detailed structure and implementation can be sufficiently taught, suggested, and described by knowledge of ordinary knowledge in the art, and therefore will not be elaborated further.

[0033] The light valve 60 is, for example, a reflective light modulator such as a liquid crystal on silicon panel (LCoS panel) or a digital micromirror device (DMD). In some embodiments, the light valve 60 may also be a transparent liquid crystal panel, an electro-optic modulator, a magneto-optic modulator, an acousto-optic modulator (AOM), or a transmissive light modulator. This invention does not limit the type or form of the light valve 60. The detailed steps and implementation of the method by which the light valve 60 converts the illumination beam LB into an image beam LI are sufficiently taught, suggested, and described by knowledge of the art and therefore will not be elaborated further. In this embodiment, the number of light valves 60 is one, for example, a projection device 10 using a single digital micromirror device, but in other embodiments, there may be multiple light valves; this invention is not limited thereto.

[0034] The projection lens 70 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include planar optical lenses to project the image beam L1 from the light valve 60 onto the projection target by reflection. The present invention does not limit the type or form of the projection lens 70.

[0035] Figure 2A This is a three-dimensional schematic diagram of the wavelength conversion device according to the first embodiment of the present invention. Figure 2B This is a front view schematic diagram of a wavelength conversion device according to another embodiment of the present invention. Figure 3 This is a cross-sectional schematic diagram of the wavelength conversion device according to the first embodiment of the present invention, for example, using... Figure 2A The dashed line is a schematic diagram of the cross-section of the cutting line. Figure 4 This is an exploded perspective view of the wavelength conversion device according to the first embodiment of the present invention. Please refer to... Figures 2A to 4 The wavelength conversion device 100 of this embodiment can be applied to at least Figure 1 The following description applies to the lighting system 50 of the projection device 10. Figure 1 Taking the lighting system 50 as an example, the wavelength conversion device 100 is, for example, a phosphor wheel, used to convert the excitation beam into an excited beam of different wavelengths, thereby providing it as part of the lighting beam LB.

[0036] In this first embodiment, the wavelength conversion device 100 includes a turntable 110, a wavelength conversion material 120, a light-transmitting counterweight ring 130, a first adhesive layer 140, and at least one counterweight 150. The turntable 110 has a central axis C for supporting other components and rotating around the central axis C. In this embodiment, the surface of the turntable 110 has high reflectivity. For example, the turntable 110 is made of metal or coated with a reflective coating on its upper surface S1. In other embodiments, the turntable 110 may have an opening to allow an excitation beam to pass through, and a light-transmitting substrate may be selectively disposed in the opening. The wavelength conversion material 120 is disposed on the outer edge of the upper surface S1 of the turntable 110 (e.g., the outer edge region of the upper surface S1). In this embodiment, the wavelength conversion material 120 may be a ring structure with a central angle of 360 degrees. In another embodiment, the wavelength conversion material 120A may be a partially ring structure with a central angle less than 360 degrees (i.e., a non-complete ring, such as...). Figure 2B As shown, the counterweight 150 is, for example, closer to the notch of the wavelength conversion material 120A, but the invention is not limited thereto. In other embodiments, when the turntable 110 has an opening, the wavelength conversion material 120 is a partially annular structure, and the notch of the partially annular structure is located in the area corresponding to the opening of the turntable 110. In one embodiment, the wavelength conversion material 120 may include a first wavelength conversion material and a second wavelength conversion material, which are located in different areas and connected to form an annular structure or a partially annular structure.

[0037] A light-transmitting counterweight ring 130 is disposed on the upper surface S1 of the turntable 110 and does not overlap with the wavelength conversion material 120 in a direction parallel to the central axis C. That is, the projection range of the light-transmitting counterweight ring 130 on the upper surface S1 does not overlap with the projection range of the wavelength conversion material 120 on the upper surface S1. The wavelength conversion material 120 is, for example, arranged around the light-transmitting counterweight ring 130. The light-transmitting counterweight ring 130 is used to support at least one counterweight 150 to correct the center of gravity position of the wavelength conversion device 100 (for example, the central axis C is located between the center of gravity of at least one counterweight 150 and the center of gravity of the wavelength conversion device 100 excluding the center of gravity of at least one counterweight 150). The light-transmitting counterweight ring 130 has a light-transmitting structure and includes a ring body 132 and an outer protrusion 134. The ring body 132 is disc-shaped and has a through hole H, through which the central axis C passes, for example. The outer protrusion 134 is disposed on the surface S2 of the ring body 132 away from the turntable 110. In this embodiment, the light-transmitting counterweight ring 130 is composed of a homogeneous material, such as a mixture of glass, ceramics, polymer materials, polymer materials and solid fillers, or a porous material (such as foamed metal or porous ceramics), and has a light transmittance of more than 25%.

[0038] The first adhesive layer 140 is disposed between the light-transmitting counterweight ring 130 and the turntable 110 to fix the light-transmitting counterweight ring 130 and the turntable 110. In this embodiment, the first adhesive layer 140 is made of a light-transmitting material, but the present invention does not limit the type of the first adhesive layer 140 or the material it is made of.

[0039] At least one counterweight 150 is disposed on the side of the light-transmitting counterweight ring 130 away from the turntable 110 (i.e., surface S2) to correct the center of gravity position of the wavelength conversion device 100, for example, to correct the center of gravity shift caused by the coating of the first adhesive layer 140, the center of gravity shift caused by different wavelength conversion materials, or the center of gravity shift caused by a non-complete circular wavelength conversion material. The counterweight 150 includes a weight 152 and a photocurable material 154 covering the weight 152, wherein at least a portion of the photocurable material 154 is located between the weight 152 and the light-transmitting counterweight ring 130. In other words, in this embodiment, the counterweight 150 is formed by curing the photocurable material 154 covering the weight 152 by irradiating it with a curing beam. For example, in this embodiment, the number of counterweights 150 is, for example, two, but the invention is not limited thereto. The counterweight 150 connects, for example, the outer protrusion 134 and the ring body 132 of the light-transmitting counterweight ring 130.

[0040] Therefore, compared to the traditional wavelength conversion device structure, the wavelength conversion device 100 of this embodiment, when manufacturing the counterweight 150, can utilize the reflection from the light-transmitting counterweight ring 130 with light-transmitting properties and the turntable 110 (or the surface of the first adhesive layer 140) to allow the curing beam to be irradiated from the side, obliquely downward, or downward (light path P, such as...). Figure 3 (As shown) UV-curable material 154. In this way, the curing effect and structural strength of UV-curable material 154 can be improved.

[0041] Figure 5 This is a three-dimensional schematic diagram of the wavelength conversion device according to the second embodiment of the present invention. Figure 6A This is a cross-sectional schematic diagram of the wavelength conversion device according to the second embodiment of the present invention. Figure 6B This is a schematic diagram of the projection area of ​​the annular boss and the counterweight in the second embodiment of the present invention. Figure 7 This is an exploded perspective view of the wavelength conversion device according to the second embodiment of the present invention. Please refer to... Figures 5 to 7 The wavelength conversion device 100A of the second embodiment is similar to the wavelength conversion device 100 of the first embodiment. The difference lies in that, in this embodiment, the turntable 110A further includes an annular boss portion 112 (e.g., ...). Figure 6AAs shown in the figure, the annular boss portion 112 has its center of symmetry overlapping the central axis C. The annular boss portion 112 is integrally formed with the surface of the turntable 110A, for example, by stamping. It can be a complete annular structure or a non-complete annular structure, and the present invention is not limited thereto. In addition, the first bonding layer 140 connects the light-transmitting counterweight ring 130 and the annular boss portion 112, and the outer diameter of the annular boss portion 112 is equal to the outer diameter of the first bonding layer. The inner diameter of the annular boss portion 112 can be selectively equal to or smaller than the inner diameter of the first bonding layer. In this embodiment, the annular boss portion 112 is adjacent to the inner edge of the turntable 110A (i.e., the through hole H), and the radius (outer diameter) of the annular boss portion 112 is smaller than the radius (outer diameter) of the light-transmitting counterweight ring 130. Therefore, a portion of the light-transmitting counterweight ring 130 is suspended above the turntable 110A.

[0042] Specifically, in this embodiment, the first adhesive layer 140 is a light-transmitting material, and the surface of the annular protrusion 112 connected to the first adhesive layer 140 is a reflective surface. Furthermore, the counterweight 150 connects the outer protrusion 134 of the light-transmitting counterweight ring 130 and the ring body 132. The annular protrusion 112 has a first projection area 112P (e.g., ...) on the upper surface S1 of the turntable 110. Figure 6B As shown), the counterweight 150 has a second projection area 150P on the upper surface S1 of the turntable 110, and the overlap area CA of the first projection area 112P and the second projection area 150P is (as shown). Figure 6B The area of ​​the dotted area shown is less than 70% of the area of ​​the second projection area 150P. Therefore, when the wavelength conversion device 100A of this embodiment manufactures the counterweight 150, since a portion of the light-transmitting counterweight ring 130 is suspended above the turntable 110A, the curing beam can also use the suspended portion as a light path P to irradiate the photocurable material 154 at the bottom of the counterweight 150, thereby increasing the area of ​​the counterweight 150 irradiated and further improving the curing effect and structural strength of the photocurable material 154.

[0043] Figure 8 This is a three-dimensional schematic diagram of the wavelength conversion device according to the third embodiment of the present invention. Figure 9 This is a cross-sectional schematic diagram of the wavelength conversion device according to the third embodiment of the present invention. Figure 10 This is an exploded perspective view of the wavelength conversion device according to the third embodiment of the present invention. Please refer to... Figures 8 to 10 The wavelength conversion device 100B of the third embodiment is similar to the wavelength conversion device 100 of the first embodiment. The difference lies in that, in this embodiment, the wavelength conversion device 100B further includes an annular boss 160 and a second bonding layer 170. The annular boss 160 includes an annular inner protrusion 162 and an annular boss ring 164. The annular inner protrusion 162 is disposed on the surface S3 of the annular boss ring 164 away from the turntable 110 (e.g., ...). Figure 10As shown, the symmetry center of the annular protrusion 160 overlaps with the central axis C. Specifically, the outer diameter of the inner annular protrusion 162 is smaller than the outer diameter of the annular protrusion ring 164, and the first bonding layer 140 is disposed between the annular protrusion ring 164 and the light-transmitting counterweight ring 130. Therefore, the annular protrusion 160 serves as a spacer structure, suspending the light-transmitting counterweight ring 130 on the turntable 110, while simultaneously increasing the reliability of positioning. Similar to the annular protrusion 112 of the second embodiment, the inner annular protrusion 162 of this embodiment can be a complete annular structure or a non-complete annular structure, and the present invention is not limited thereto. For example, the inner annular protrusion 162 can pass through the through hole H of the ring 132, thereby enhancing the structural stability of the wavelength conversion device 100B. The second bonding layer 170 is disposed between the annular boss ring 164 and the turntable 110 to fix the annular boss ring 164 and the turntable 110.

[0044] In this way, when the wavelength conversion device 100B of this embodiment manufactures the counterweight 150, since a portion of the light-transmitting counterweight ring 130 is suspended above the turntable 110, the curing beam can also use the suspended portion as a light path P to irradiate the photocurable material 154 at the bottom of the counterweight 150, thereby increasing the irradiation area of ​​the counterweight 150 and further improving the curing effect and structural strength of the photocurable material 154.

[0045] Figure 11 This is a three-dimensional schematic diagram of the wavelength conversion device according to the fourth embodiment of the present invention. Figure 12 This is a cross-sectional schematic diagram of the wavelength conversion device according to the fourth embodiment of the present invention. Figure 13 This is an exploded perspective view of the wavelength conversion device according to the fourth embodiment of the present invention. Please refer to... Figures 11 to 13 The wavelength conversion device 100C of the fourth embodiment is similar to the wavelength conversion device 100B of the third embodiment. The difference is that, in this embodiment, the surface of the annular boss 160 has high reflectivity. Therefore, in this embodiment, the annular boss ring 164 of the annular boss 160 can reflect the curing beam. Thus, unlike the third embodiment, the light-transmitting counterweight ring 130 does not need to be suspended; the curing effect can be improved as long as the annular boss ring 164 overlaps with the light-transmitting counterweight ring 130. This further improves the curing effect and structural strength of the photocurable material 154. Specifically, the outer diameter of the annular boss ring 164 can, for example, be equal to the outer diameter of the ring 132, thereby increasing the contact area of ​​the first adhesive layer 140 and the second adhesive layer 170 with the ring 132, the annular boss ring 164, and the turntable 110, and improving the structural stability of the wavelength conversion device 100C.

[0046] Figure 14 This is a three-dimensional schematic diagram of the wavelength conversion device according to the fifth embodiment of the present invention. Figure 15This is a cross-sectional schematic diagram of the wavelength conversion device according to the fifth embodiment of the present invention. Figure 16 This is an exploded perspective view of the wavelength conversion device according to the fifth embodiment of the present invention. Please refer to... Figures 14 to 16 The wavelength conversion device 100D of the fifth embodiment is similar to the wavelength conversion device 100C of the fourth embodiment. The difference lies in that, in this embodiment, the annular boss 160A further includes an annular outer protrusion 166. The annular outer protrusion 166 and the annular inner protrusion 162 are disposed on the same surface (i.e., surface S3) of the annular boss ring body 164. In this embodiment, the outer diameter of the annular outer protrusion 166 is equal to the outer diameter of the annular boss ring body 164. A first bonding layer 140 is disposed between the annular outer protrusion 166 and the light-transmitting counterweight ring 130. The outer diameter of the annular outer protrusion 166 is equal to the outer diameter of the light-transmitting counterweight ring 130.

[0047] Specifically, in this embodiment, the annular outer protrusion 166 and the annular inner protrusion 162 respectively form the outer and inner walls of the annular protrusion, and preferably, the annular inner protrusion 162 is higher than the annular outer protrusion 166. A light-transmitting counterweight ring 130 is disposed on the annular outer protrusion 166, and preferably, is connected to the annular outer protrusion 166 by a first adhesive 140. This allows the light-transmitting counterweight ring 130, the annular inner protrusion 162, the annular outer protrusion 166, and the annular boss ring 164 to surround the reflective cavity E of the solidified light beam. In a preferred embodiment, the surface of the annular boss member 160A (e.g., surface S3) has diffuse reflection characteristics, thereby making the reflective cavity E a diffuse reflection cavity. In another preferred embodiment, the reflective cavity E is filled with air, but the invention is not limited thereto.

[0048] In this way, the curing effect and structural strength of the photocurable material 154 can be further improved in this embodiment. Additionally, in this embodiment, the wavelength conversion device 100D also includes a third adhesive layer 180, disposed on the ring body 132 (e.g., surface S2) of the light-transmitting counterweight ring 130 and connected to the inner annular protrusion 162. The light-transmitting counterweight ring 130 is located between the first adhesive layer 140 and the third adhesive layer 180. This further increases the structural strength of the wavelength conversion device 100D.

[0049] In summary, in the wavelength conversion device and projection device of the present invention, a light-transmitting counterweight ring is disposed on a turntable, and at least one counterweight is disposed on the light-transmitting counterweight ring. The light-transmitting counterweight ring has a light-transmitting structure, and the counterweight includes a weight and a photocurable material covering the weight. Therefore, compared to the structure of a conventional wavelength conversion device, when manufacturing the counterweight, the wavelength conversion device can utilize the light-transmitting characteristics of the light-transmitting counterweight ring and the reflection from the turntable to increase the light path of the curing beam illuminating the photocurable material from the side, obliquely downward, or downward. This improves the curing effect and structural strength of the photocurable material.

[0050] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent changes and modifications made in accordance with the claims and specification of the present invention are still within the scope of the patent coverage of the present invention. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the present invention. In addition, the abstract and title are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

[0051] Explanation of reference numerals in the attached figures

[0052] 10: Projection device

[0053] 50: Lighting System

[0054] 60: Light valve

[0055] 70: Projection lens

[0056] 100, 100A~100D: Wavelength conversion device

[0057] 110, 110A: Turntable

[0058] 112: Annular boss portion

[0059] 112P: First projection area

[0060] 120, 120A: Wavelength conversion material

[0061] 130: Translucent counterweight ring

[0062] 132: Ring body

[0063] 134: Outer protrusion

[0064] 140: First connecting layer

[0065] 150: Counterweight

[0066] 150P: Second projection area

[0067] 152: Heavy objects

[0068] 154: Photocurable materials

[0069] 160, 160A: Annular boss component

[0070] 162: Annular inner protrusion

[0071] 164: Annular boss ring body

[0072] 166: Circular outer protrusion

[0073] 170: Second adjacent layer

[0074] 180: Third connecting layer

[0075] C: Central axis

[0076] CA: Overlapping region

[0077] E: Reflecting cavity

[0078] H: Through hole

[0079] LB: Illumination beam

[0080] LI: Image Beam

[0081] P: Optical path

[0082] S1: Upper surface

[0083] S2, S3: Surface.

Claims

1. A wavelength conversion device, comprising a turntable, a wavelength conversion material, a light-transmitting counterweight ring, a first adhesive layer, and at least one counterweight. The turntable has a central axis and rotates about the central axis. The wavelength conversion material is disposed on the outer edge of the upper surface of the turntable; The light-transmitting counterweight ring is disposed on the upper surface of the turntable. The light-transmitting counterweight ring has a light-transmitting structure and includes a ring body and an outer protrusion. The outer protrusion is disposed on the surface of the ring body away from the turntable. The first bonding layer is disposed between the light-transmitting counterweight ring and the turntable; and The at least one counterweight is disposed on the side of the light-transmitting counterweight ring away from the turntable. The at least one counterweight includes a weight and a photocurable material covering the weight, wherein at least a portion of the photocurable material is located between the weight and the light-transmitting counterweight ring.

2. The wavelength conversion device according to claim 1, characterized in that, The light-transmitting counterweight ring is composed of a mixture of glass, ceramics, polymer materials and solid fillers, polymer materials or porous materials, and has a light transmittance of more than 25%.

3. The wavelength conversion device according to claim 1, characterized in that, The first adhesive layer is a light-transmitting material.

4. The wavelength conversion device according to claim 1, characterized in that, The turntable includes an annular boss portion, and the first adhesive layer is connected between the light-transmitting counterweight ring and the annular boss portion. The outer diameter of the annular boss portion is equal to the outer diameter of the first adhesive layer.

5. The wavelength conversion device according to claim 4, characterized in that, The radius of the annular protrusion is smaller than the radius of the light-transmitting counterweight ring.

6. The wavelength conversion device according to claim 5, characterized in that, The at least one counterweight connects the outer protrusion of the light-transmitting counterweight ring and the ring body. The annular protrusion has a first projection area on the orthographic projection of the upper surface of the turntable, and the at least one counterweight has a second projection area on the orthographic projection of the upper surface of the turntable. The area of ​​the overlapping region between the first projection area and the second projection area accounts for less than 70% of the area of ​​the second projection area.

7. The wavelength conversion device according to claim 1, characterized in that, Also includes: An annular boss component includes an inner annular protrusion and an annular boss ring body. The inner annular protrusion is disposed on the surface of the annular boss ring body away from the turntable. The outer diameter of the inner annular protrusion is smaller than the outer diameter of the annular boss ring body, and a first bonding layer is disposed between the annular boss ring body and the light-transmitting counterweight ring. The second bonding layer is disposed between the annular boss and the turntable.

8. The wavelength conversion device according to claim 4, characterized in that, The first adhesive layer is a light-transmitting material, and the surface of the annular protrusion that connects to the first adhesive layer is a reflective surface.

9. The wavelength conversion device according to claim 7, characterized in that, The annular boss further includes an annular outer protrusion, which is disposed on the same surface as the annular inner protrusion. The outer diameter of the annular outer protrusion is equal to the outer diameter of the annular boss. The first bonding layer is disposed between the annular outer protrusion and the light-transmitting counterweight ring, and the outer diameter of the annular outer protrusion is equal to the outer diameter of the light-transmitting counterweight ring.

10. The wavelength conversion device according to claim 9, characterized in that, Also includes: The third bonding layer is disposed on the ring body of the light-transmitting counterweight ring and connected to the inner protrusion of the ring. The light-transmitting counterweight ring is located between the first bonding layer and the third bonding layer.

11. A projection device, comprising an illumination system, at least one light valve, and a projection lens. The lighting system is used to provide an illumination beam. The lighting system includes a wavelength conversion device, which includes a turntable, a wavelength conversion material, a light-transmitting counterweight ring, a first adhesive layer, and at least one counterweight. The turntable has a central axis and rotates about the central axis. The wavelength conversion material is disposed on the outer edge of the upper surface of the turntable; The light-transmitting counterweight ring is disposed on the upper surface of the turntable. The light-transmitting counterweight ring includes a ring body and an outer protrusion. The outer protrusion is disposed on the surface of the ring body away from the turntable. The first bonding layer is disposed between the light-transmitting counterweight ring and the turntable; and The at least one counterweight is disposed on the side of the light-transmitting counterweight ring away from the turntable. The at least one counterweight includes a weight and a photocurable material covering the weight, wherein at least a portion of the photocurable material is located between the weight and the light-transmitting counterweight ring. The at least one light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam; and The projection lens is positioned on the transmission path of the image beam to project the image beam out of the projection device.

12. The projection device according to claim 11, characterized in that, The light-transmitting counterweight ring is composed of a mixture of glass, ceramics, polymer materials and solid fillers, polymer materials or porous materials, and has a light transmittance of more than 25%.

13. The projection device according to claim 11, characterized in that, The first adhesive layer is a light-transmitting material.

14. The projection device according to claim 11, characterized in that, The turntable includes an annular boss portion, and the first adhesive layer is connected between the light-transmitting counterweight ring and the annular boss portion. The outer diameter of the annular boss portion is equal to the outer diameter of the first adhesive layer.

15. The projection device according to claim 14, characterized in that, The radius of the annular protrusion is smaller than the radius of the light-transmitting counterweight ring.

16. The projection device according to claim 15, characterized in that, The at least one counterweight connects the outer protrusion of the light-transmitting counterweight ring and the ring body. The annular protrusion has a first projection area on the orthographic projection of the upper surface of the turntable, and the at least one counterweight has a second projection area on the orthographic projection of the upper surface of the turntable. The area of ​​the overlapping region between the first projection area and the second projection area accounts for less than 70% of the area of ​​the second projection area.

17. The projection device according to claim 11, characterized in that, The wavelength conversion device further includes an annular boss and a second bonding layer. The annular boss includes an inner annular protrusion and an annular boss body. The inner annular protrusion is disposed on the surface of the annular boss body away from the turntable. The outer diameter of the inner annular protrusion is smaller than the outer diameter of the annular boss body. The first bonding layer is disposed between the annular boss body and the light-transmitting counterweight ring, and the second bonding layer is disposed between the annular boss and the turntable.

18. The projection device according to claim 14, characterized in that, The first adhesive layer is a light-transmitting material, and the surface of the annular protrusion that connects to the first adhesive layer is a reflective surface.

19. The projection device according to claim 17, characterized in that, The annular boss further includes an annular outer protrusion, which is disposed on the same surface as the annular inner protrusion. The outer diameter of the annular outer protrusion is equal to the outer diameter of the annular boss. The first bonding layer is connected between the annular outer wall and the light-transmitting counterweight ring, and the outer diameter of the annular outer protrusion is equal to the outer diameter of the light-transmitting counterweight ring.

20. The projection device according to claim 19, characterized in that, The wavelength conversion device further includes a third bonding layer, which is disposed on the ring body of the light-transmitting counterweight ring and connected to the inner protrusion of the ring. The light-transmitting counterweight ring is located between the first bonding layer and the third bonding layer.

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