Wavelength conversion device and projection device
By designing a wavelength conversion device including wavelength conversion elements, condenser lenses, fixing devices, heat dissipation airflow devices and air guide structures in the laser projector, the problem of poor heat dissipation of the condenser lens is solved and more efficient heat dissipation effect is achieved and better projection quality.
Patent Information
- Application Number
- CN202310946696.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-31
- Publication Date
- 2025-02-14
AI Technical Summary
In existing laser projectors, the condenser lens is not effective enough to overheat and may rupture.
A wavelength conversion device is designed, including a wavelength conversion element, a condenser lens, a fixing device, a heat dissipation airflow device and a wind guide structure. The condenser lens is fixed to the fixing device, and the ventilation opening exposes a part of the condenser lens. The air guide structure guides the airflow generated by the heat dissipation airflow device to the ventilation opening to achieve effective heat dissipation of the condenser lens.
Through effective heat dissipation measures, the temperature of the condenser lens is reduced, the problems of overheating and rupture of the condenser lens are avoided, and the projection quality and product competitiveness of the projection device are improved.
Smart Images
Figure CN119439586A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an optical device, and in particular to a wavelength conversion device and a projection device using the wavelength conversion device. Background Art
[0002] Laser projectors currently use laser phosphor as the main technology, in which there is a focusing lens in front of the phosphor wheel to receive incident light and stimulated light. Currently, the heat dissipation method for the focusing lens is mainly to dissipate the heat through the wind flow driven by the rotation of the phosphor wheel. However, this wind flow cannot effectively dissipate the heat of the focusing lens, which leads to the problem of overheating and cracking of the focusing lens.
[0003] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention
[0004] The invention provides a wavelength conversion device which has better heat dissipation efficiency.
[0005] The present invention also provides a projection device, including the wavelength conversion device, which can have better projection quality and product competitiveness.
[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.
[0007] To achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention proposes a wavelength conversion device, including a wavelength conversion element, at least one focusing lens, at least one fixing device, a heat dissipation wind flow device and an air guide structure. The wavelength conversion element includes a substrate, a wavelength conversion layer and a driving component. The substrate has a first surface and a second surface opposite to each other. The wavelength conversion layer is arranged on the first surface, and the driving component drives the substrate to rotate with the rotating shaft of the driving component as the central axis. The focusing lens is arranged on one side of the first surface of the wavelength conversion element and fixed to the fixing device. The fixing device has at least one vent, and the vent exposes a portion of the focusing lens. The air guide structure connects the heat dissipation wind flow device and the vent.
[0008] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the design of the wavelength conversion device of the present invention, the focusing lens is fixed to the fixing device, and the vent of the fixing device exposes a part of the focusing lens, and the wind guide structure connects the heat dissipation wind flow device and the vent. Thereby, the wind guide structure can guide the wind flow generated by the heat dissipation wind flow device to the vent to dissipate the heat of the focusing lens, and can effectively cool the focusing lens. In short, the wavelength conversion device of the present invention can have a better heat dissipation effect, and the projection device using the wavelength conversion device of the present invention can have better projection quality and product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a schematic diagram of a projection device according to an embodiment of the present invention.
[0010] Figure 2 yes Figure 1 Schematic diagram of a wavelength conversion device in a projection device.
[0011] Figure 3A It is a three-dimensional schematic diagram of a projection device according to another embodiment of the present invention.
[0012] Figure 3B yes Figure 3A A three-dimensional diagram from another perspective.
[0013] Figure 3C yes Figure 3A Schematic diagram of a wavelength conversion device in a projection device.
[0014] Figure 3D yes Figure 3C A three-dimensional diagram from another perspective.
[0015] Figure 3E yes Figure 3D A side view schematic diagram from another viewing angle.
[0016] Figure 3F yes Figure 3D An enlarged stereoscopic schematic diagram of the fixing device and the focusing lens.
[0017] Figure 3G for Figure 3F Schematic diagram of the relative positions of the central vent and the focusing lens.
[0018] Description of reference numerals:
[0019] 10a, 10b: Projection device
[0020] 20: Lighting module
[0021] 30: Light valve
[0022] 40: Projection lens
[0023] 50: Shell
[0024] 60: Heat dissipation components
[0025] 61: Cooling fins
[0026] 62: The first heat dissipation part
[0027] 63: Thermally conductive structure
[0028] 64: Second heat dissipation part
[0029] 70: Outer air flow device
[0030] 100a: Wavelength conversion device
[0031] 110: Wavelength conversion element
[0032] 111: First surface
[0033] 112: Substrate
[0034] 113: Second Surface
[0035] 114: Wavelength conversion layer
[0036] 116: Drive components
[0037] 120: Focusing lens
[0038] 120a: First condenser lens
[0039] 120b: Second focusing lens
[0040] 130: Cooling air flow device
[0041] 140: Wind guide structure
[0042] 150, 150a, 150b, 151: Fixing device
[0043] 152, 152a: Ventilation opening
[0044] 160a: First wind flow device
[0045] 160b: Second wind flow device
[0046] D: Rotation axis
[0047] D1: First rotation axis
[0048] D2: Second rotation axis
[0049] E1: First air outlet
[0050] E2: Second air outlet
[0051] F: Romantic
[0052] L1: illumination beam
[0053] L': Excitation beam
[0054] L2: Image beam
[0055] S1: First side
[0056] S2: Second side
[0057] X: center axis. DETAILED DESCRIPTION
[0058] The above-mentioned 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, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.
[0059] Figure 1 is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 In this embodiment, the projection device 10a includes an illumination module 20, a light valve 30 and a projection lens 40. The illumination module 20 is used to provide an illumination beam L1. The illumination module 20 includes a light source module 22 and a wavelength conversion device 100a. The light source module 22 is used to provide an excitation beam L'. The wavelength conversion device 100a is, for example, a phosphor wheel, which is used to receive the excitation beam L'. The wavelength conversion device 100a is disposed on the transmission path of the excitation beam L', and is used to convert the wavelength of the excitation beam L' to generate a converted beam with a different wavelength. Here, the illumination beam L1 includes the excitation beam L' and the converted beam, and the excitation beam L' and the converted beam are, for example, transmitted out of the illumination module 20 in a time-sequential manner, but the present invention is not limited thereto. The light valve 30 is disposed on the transmission path of the illumination beam L1 to convert the illumination beam L1 into an image beam L2. The projection lens 40 is disposed on the transmission path of the image beam L2 to project the image beam L2 out of the projection device 10a.
[0060] Furthermore, the light source module 22 used in the present embodiment is, for example, a laser diode (LD), such as a laser diode bank. Specifically, any light source that meets the volume requirements in actual design can be implemented, and the present invention is not limited thereto. The light valve 30 is, for example, a reflective light modulator such as a liquid crystal on silicon panel (LCoS panel) or a digital micro-mirror device (DMD). In one embodiment, the light valve 30 is, for example, a transmissive light modulator such as a transparent liquid crystal panel (Transparent Liquid Crystal Panel), an electro-optical modulator (Electro-Optical Modulator), a magneto-optical modulator (Maganeto-Optic modulator), or an acousto-optic modulator (AOM), but the present embodiment does not limit the type and type of the light valve 30. The detailed steps and implementation methods of the method for the light valve 30 to modulate the illumination light beam L1 into the image light beam L2 can be sufficiently taught, suggested and implemented by the common knowledge in the relevant technical field, so it is not repeated here. In addition, the projection lens 40, for example, includes a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 40 may also include a planar optical lens to project the image light beam L2 from the light valve 30 out of the projection device 10a in a reflection or penetration manner. Here, this embodiment does not limit the type and type of the projection lens 40.
[0061] Figure 2 yes Figure 1 In this embodiment, the wavelength conversion device 100a includes a wavelength conversion element 110, at least one focusing lens 120, at least one fixing device 150, a heat dissipation device 130 and a wind guide structure 140.
[0062] Further, in this embodiment, the wavelength conversion element 110 includes a substrate 112, a wavelength conversion layer 114 and a driving component 116. The substrate 112 has a first surface 111 and a second surface 113 opposite to each other, wherein the material of the substrate 112 is, for example, aluminum, aluminum alloy, copper or stainless steel, but is not limited thereto. The first side S1 of the wavelength conversion element 110 is, for example, a side of the first surface 111, and the second side S2 of the wavelength conversion element 110 is, for example, a side of the second surface 113, that is, the first side S1 and the second side S2 are separated by the substrate 112. In one embodiment, the wavelength conversion element 110 may further include an optical plate to define a disc shape with the substrate 112, wherein the material of the optical plate is, for example, glass or plastic. In one embodiment, the optical plate may be provided with a reflective layer to reflect blue laser light, but is not limited thereto. The wavelength conversion layer 114 is disposed on the first surface 111, wherein the wavelength conversion layer 114 is, for example, a phosphor layer, but is not limited thereto. The driving component 116 is, for example, disposed on one side of the second surface 113 and drives the substrate 112 to rotate with the rotation axis of the driving component 116 as the central axis. The driving component 116 is coaxially disposed with the substrate 112, wherein the driving component 116 is, for example, a motor, but is not limited thereto. In the present embodiment, the excitation light beam L' from the light source module 22 is first transmitted to at least one condenser lens 120, and after penetrating at least one condenser lens 120, is transmitted to the wavelength conversion layer 114 to generate a conversion light beam, and the conversion light beam is transmitted to at least one condenser lens 120 through reflection by the substrate 112 (or other reflective elements), and is transmitted toward the light valve 30.
[0063] In this embodiment, the at least one condensing lens 120 includes a first condensing lens 120a and a second condensing lens 120b, wherein the first condensing lens 120a is located between the wavelength conversion element 110 and the second condensing lens 120b. Furthermore, the wavelength conversion device 100a of this embodiment has at least one fixing device 150. Here, the number of the at least one fixing device 150 is the same as the number of the at least one condensing lens 120, wherein the at least one fixing device 150 includes a fixing device 150a and a fixing device 150b. The first condensing lens 120a is fixed to the fixing device 150a, and the second condensing lens 120b is fixed to the fixing device 150b. In other embodiments, the fixing devices 150a and 150b can be integrated into one, that is, the number of at least one fixing device 150 is one, which can fix the first condenser lens 120a and the second condenser lens 120b at the same time, so that there is a distance between the first condenser lens 120a and the second condenser lens 120b, and the first condenser lens 120a and the second condenser lens 120b are arranged on one side of the first surface 111 of the wavelength conversion element 110 (that is, the first side S1, the front of the wavelength conversion element 110). Further, the first condenser lens 120a and the second condenser lens 120b overlap a partial area of the wavelength conversion layer 114 in the orthographic projection area of the first surface 111.
[0064] At least one fixing device 150 has at least one ventilation opening 152. In this embodiment, at least one ventilation opening 152 is located between the fixing devices 150a and 150b, for example. Figure 2 As shown, at least one vent 152 exposes a portion of at least one focusing lens 120 (e.g., the first focusing lens 120a). The wind guide structure 140 is connected between the heat dissipation wind flow device 130 and the at least one vent 152 to guide the wind flow F generated by the heat dissipation wind flow device 130 to the at least one vent 152 to dissipate heat for the at least one focusing lens 120. In the present embodiment, the heat dissipation wind flow device 130 is disposed on the second side S2 of the wavelength conversion element 110 (i.e., one side of the second surface 113 of the wavelength conversion element 110, behind the wavelength conversion element 110), and the wind guide structure 140 extends from the second side S2 to be disposed on the first side S1. In other embodiments, the heat dissipation wind flow device 130 can be disposed in areas on different sides of the wavelength conversion element 110 according to its needs and space limitations.
[0065] In this embodiment, in addition to the wind flow driven by the wavelength conversion element 110 when rotating, which can dissipate heat for the first condenser lens 120a and the second condenser lens 120b, the wind flow F generated by the heat dissipation wind flow device 130 added to the second side S2 of the wavelength conversion element 110 can dissipate heat for the first condenser lens 120a and the second condenser lens 120b through the guidance of the wind guide structure 140. In other words, the wind flow F generated by the heat dissipation wind flow device 130 can cool the first condenser lens 120a and the second condenser lens 120b at the same time, and effectively dissipate heat. In a simulation experiment, under the condition of using a laser power of 2.2A, the temperature of the first condenser lens 120a and the second condenser lens 120b can be effectively reduced by 17%. In short, the wavelength conversion device 100a of this embodiment can have a better heat dissipation effect, and reduce the temperature of at least one condenser lens 120 disposed in front of the wavelength conversion element 110, so as to avoid overheating of the element and provide better projection quality.
[0066] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. The description of the omitted parts can be referred to the previous embodiments, and the following embodiments will not be repeated.
[0067] Figure 3A It is a three-dimensional schematic diagram of a projection device according to another embodiment of the present invention. Figure 3B yes Figure 3A A three-dimensional diagram from another perspective. Figure 3C yes Figure 3A Schematic diagram of a wavelength conversion device in a projection device. Figure 3D yes Figure 3C A three-dimensional diagram from another perspective. Figure 3E yes Figure 3D A side view schematic diagram from another viewing angle. Figure 3F yes Figure 3D An enlarged stereoscopic schematic diagram of the fixing device and the focusing lens. Figure 3G for Figure 3F Schematic diagram of the relative position of the central vent and the focusing lens. For the sake of convenience, Figure 3C and Figure 3D The housing is omitted. Figure 3E The shell and Figure 3G The ventilation openings are indicated by dotted lines.
[0068] Please refer to Figure 3A , Figure 3D , Figure 3E and Figure 3FIn this embodiment, the projection device 10b further includes a housing 50, wherein the wavelength conversion element 110, the first condenser lens 120a and the second condenser lens 120b, the heat dissipation airflow device 130 and the air guide structure 140 are disposed in the housing 50. Figure 3A , Figure 3B as well as Figure 3E The projection device 10b of this embodiment further includes a heat dissipation assembly 60, wherein the heat dissipation assembly 60 includes a first heat dissipation portion 62 and a second heat dissipation portion 64 connected to each other. The first heat dissipation portion 62 is disposed in the housing 50 and is located on the side of the wavelength conversion element 110. The second heat dissipation portion 64 is disposed outside the housing 50. Here, the heat dissipation assembly 60 includes a heat dissipation fin group 61 and at least one heat-conducting structure (schematically depicting a plurality of heat-conducting structures 63) passing through the heat dissipation fin group 61, the first heat dissipation portion 62 includes a portion of the heat dissipation fin group 61 and a portion of at least one heat-conducting structure 63, and the second heat dissipation portion 64 includes another portion of the heat dissipation fin group 61 and another portion of at least one heat-conducting structure 63. In one embodiment, the heat sink fin group 61 is, for example, formed by stacking a plurality of metal sheets (each metal sheet is, for example, parallel to the XZ plane), and the heat conducting structure 63 is, for example, a heat pipe (each heat pipe extends, for example, along the Y direction, i.e., the arrangement direction of the plurality of metal sheets), some of the metal sheets are disposed inside the housing 50 and another portion of the metal sheets is disposed outside the housing 50, and the heat pipe extends from inside the housing 50 to outside the housing 50, but is not limited thereto. In addition, as Figure 3B As shown, the projection device 10 b of this embodiment may further include an outer air flow device 70 disposed outside the housing 50 and adjacent to the second heat dissipation portion 64 of the heat dissipation component 60 for cooling the heat dissipation component 60 , thereby reducing the air temperature in the housing 50 .
[0069] Next, please refer to Figure 2 , Figure 3C and Figure 3D The wavelength conversion device 100b of this embodiment is Figure 2The wavelength conversion device 100b is similar to the wavelength conversion device 100a of the embodiment, but the main difference between the two is that: in this embodiment, the wavelength conversion device 100b further includes a first air flow device 160a and a second air flow device 160b. The first air flow device 160a is located on the first side S1, and the first air outlet E1 of the first air flow device 160a faces at least a portion of the wavelength conversion layer 114 of the wavelength conversion element 110. The second air flow device 160b is located on the second side S2, and the second air outlet E2 of the second air flow device 160b faces the wavelength conversion element 110. If the wavelength conversion element 110 is used as a boundary, the front of the wavelength conversion element 110 (the first surface 111 of the wavelength conversion element 110 is, for example, parallel to the YZ plane) can be defined as the first side S1, and the rear of the wavelength conversion element 110 can be defined as the second side S2, and a side adjacent to the first side S1 and the second side S2 is defined as a side edge, and the heat dissipation component 60 is located on this side edge.
[0070] like Figure 3D and Figure 3E As shown, the wavelength conversion element 110 has a central axis X (the central axis X is, for example, parallel to the X-axis), and the heat dissipation airflow device 130 and the second airflow device 160b are located on different sides of the central axis X, that is, the heat dissipation airflow device 130 is located on the lower side of the central axis X, and the second airflow device 160b is located on the upper side of the central axis X (that is, the central axis X is located between the heat dissipation airflow device 130 and the second airflow device 160b). The first airflow device 160a and the second airflow device 160b are located on the same side of the central axis X, that is, the first airflow device 160a and the second airflow device 160b are located on the upper side of the central axis X. The first airflow device 160a and the second airflow device 160b are used to cool the wavelength conversion element 110, and the cooled hot air is dissipated through the heat dissipation component 60 to cool the wavelength conversion element 110 again. Please refer to Figure 3D , Figure 3E as well as Figure 3F The heat dissipation airflow device 130 is located below the second airflow device 160b, and guides the airflow F through the air guide structure 140 to cool the first focusing lens 120a and the second focusing lens 120b at the same time. With this arrangement, the original system volume can be maintained and the space utilization rate can be increased.
[0071] Furthermore, please refer to Figure 3D, the first rotation axis D1 of the first air flow device 160a (the first rotation axis D1 is, for example, parallel to the Y axis) is perpendicular to the rotation axis D of the heat dissipation air flow device 130 (the rotation axis D is, for example, parallel to the X axis). The second rotation axis D2 of the second air flow device 160b is not parallel to and not perpendicular to the first rotation axis D1 (the first rotation axis D1 is, for example, parallel to the YZ plane). That is, the setting method of the second air flow device 160b is different from the setting direction of the first air flow device 160a. Here, the air flow device is, for example, an axial flow device, and the rotation axis is, for example, the rotation axis of the fan blades of the axial flow device, wherein the second rotation axis D2 is inclined relative to the extension direction of the heat conducting structure 63 of the heat dissipation assembly 60, and its purpose is to allow the heat dissipation air flow device 130 to have more cold air from the heat dissipation fin group 61.
[0072] Please refer to Figure 3D , Figure 3E and Figure 3F , the orthographic projection of the second air outlet E2 of the second air flow device 160b on the first surface 111 of the wavelength conversion element 110 is located between the orthographic projection of the first air outlet E1 of the first air flow device 160a on the first surface 111 of the wavelength conversion element 110 and the orthographic projection of at least one focusing lens 120 on the first surface 111 of the wavelength conversion element 110. In this embodiment, the number of at least one fixing device 151 is one, which is used to fix the first focusing lens 120a and the second focusing lens 120b, wherein at least one fixing device 151 has at least one vent (schematically showing one vent 152a), and the vent 152a is, for example, a hole of the fixing device 151, and the air guide structure 140 connects the heat dissipation air flow device 130 and the vent 152a. Please also refer to Figure 3D , Figure 3E , Figure 3F and Figure 3G The vent 152a at least exposes the first condensing lens 120a, and the wind flow F passes between the first condensing lens 120a and the second condensing lens 120b, and the cooled hot air is then dissipated through the heat dissipation assembly 60. In one embodiment, the vent 152a may further cover at least a portion of the wavelength conversion element 110, and the wind flow F may pass through the first condensing lens 120a and the second condensing lens 120b, and pass through the side of the wavelength conversion element 110 at the same time.
[0073] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the design of the wavelength conversion device of the present invention, the focusing lens is fixed to the fixing device, and the vent of the fixing device exposes a portion of the focusing lens, and the wind guide structure connects the heat dissipation wind flow device and the vent. Thereby, the wind guide structure can guide the wind flow generated by the heat dissipation wind flow device to the vent to dissipate the heat of the focusing lens disposed on one side of the first surface of the wavelength conversion element, and can effectively cool the focusing lens. In short, the wavelength conversion device of the present invention can have a better heat dissipation effect, and the projection device using the wavelength conversion device of the present invention can have better projection quality and product competitiveness.
[0074] However, the above is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the invention description are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.
Claims
1. A wavelength conversion device, characterized in that: The wavelength conversion device comprises a wavelength conversion element, at least one focusing lens, at least one fixing device, a heat dissipation and air flow device, and an air guide structure, wherein: The wavelength conversion element comprises a substrate, a wavelength conversion layer and a driving component, wherein the substrate has a first surface and a second surface opposite to each other, the wavelength conversion layer is disposed on the first surface, and the driving component drives the substrate to rotate with the rotation axis of the driving component as the central axis; The at least one condensing lens is disposed on one side of the first surface of the wavelength conversion element and fixed to the at least one fixing device; The at least one fixing device has at least one ventilation opening, and the at least one ventilation opening exposes a portion of the at least one focusing lens; and The air guiding structure connects the heat dissipation air flow device and the at least one vent.
2. The wavelength conversion device according to claim 1, characterized in that: The at least one condensing lens is disposed on a first side of the wavelength conversion element, the heat dissipation airflow device is disposed on a second side of the wavelength conversion element, and the air guide structure extends from the second side and is disposed on the first side.
3. The wavelength conversion device according to claim 2, characterized in that: The wavelength conversion device further comprises a first wind flow device and a second wind flow device, wherein: The first air flow device is located at the first side, and a first air outlet of the first air flow device faces the wavelength conversion element, while the second air flow device is located at the second side, and a second air outlet of the second air flow device faces the wavelength conversion element.
4. The wavelength conversion device according to claim 3, characterized in that: The heat dissipation air flow device and the second air flow device are located on different sides of the central axis, and the first air flow device and the second air flow device are located on the same side of the central axis.
5. The wavelength conversion device according to claim 3, characterized in that: The first rotation axis of the first air flow device is perpendicular to the rotation axis of the heat dissipation air flow device, and the second rotation axis of the second air flow device is not parallel to and not perpendicular to the first rotation axis.
6. The wavelength conversion device according to claim 5, characterized in that: The orthographic projection of the second air outlet on the first surface of the wavelength conversion element is located between the orthographic projection of the first air outlet on the first surface and the orthographic projection of the at least one condensing lens on the first surface.
7. The wavelength conversion device according to claim 1, characterized in that: The at least one condensing lens includes a first condensing lens and a second condensing lens, the first condensing lens is located between the wavelength conversion element and the second condensing lens, and the at least one vent at least exposes the first condensing lens.
8. The wavelength conversion device according to claim 1, characterized in that: The at least one ventilation opening also covers at least a portion of the wavelength conversion element.
9. A projection device, characterized in that: The projection device comprises an illumination module, a light valve and a projection lens, wherein: The lighting module is used to provide an illumination beam, and the lighting module includes a light source module and a wavelength conversion device, wherein: The light source module is used to provide an excitation light beam; and The wavelength conversion device is disposed on the transmission path of the excitation light beam, and the wavelength conversion device includes a wavelength conversion element, at least one focusing lens, at least one fixing device, a heat dissipation air flow device and an air guide structure, wherein: The wavelength conversion element comprises a substrate, a wavelength conversion layer and a driving component, wherein the substrate has a first surface and a second surface opposite to each other, the wavelength conversion layer is disposed on the first surface, and the driving component drives the substrate to rotate with the rotation axis of the driving component as the central axis; The at least one condensing lens is disposed on one side of the first surface of the wavelength conversion element and fixed to the at least one fixing device; The at least one fixing device has at least one ventilation opening, and the at least one ventilation opening exposes a portion of the at least one focusing lens; and The air guide structure connects the heat dissipation air flow device and the at least one vent; The light valve is disposed on a transmission path of the illumination light beam to convert the illumination light beam into an image light beam; and The projection lens is arranged on the transmission path of the image light beam to project the image light beam out of the projection device.
10. The projection device according to claim 9, characterized in that: The projection device further comprises a housing, wherein: The wavelength conversion element, the at least one focusing lens, the heat dissipation and air flow device, and the air guide structure are disposed in the housing.
11. The projection device according to claim 10, characterized in that: The projection device further comprises a heat dissipation component, wherein: The heat dissipation assembly includes a first heat dissipation portion and a second heat dissipation portion connected to each other, the first heat dissipation portion is arranged in the housing and located at the side of the wavelength conversion element, and the second heat dissipation portion is arranged outside the housing.
12. The projection device according to claim 11, characterized in that: The projection device further comprises an outer wind flow device, wherein: The outer air flow device is arranged outside the housing and adjacent to the second heat dissipation portion of the heat dissipation component.
13. The projection device according to claim 11, characterized in that: The heat dissipation assembly includes a heat dissipation fin group and at least one heat conduction structure passing through the heat dissipation fin group.