Projection light machine and projection device

Abstract

The application discloses a projection light machine and a projection device, the projection light machine comprises a shell, an optical assembly, a first heat dissipation assembly and an internal circulation air duct, the optical assembly is arranged on the shell and defines the internal circulation air duct with the surface of the shell, the first heat dissipation assembly is arranged on the shell and comprises a first heat dissipation piece arranged on the inner surface of the shell, the first heat dissipation piece comprises a plurality of heat dissipation columns arranged at intervals, each heat dissipation column extends inward from the inner surface of the shell, the internal circulation air fan is arranged in the internal circulation air duct and is used for driving the airflow in the internal circulation air duct to flow, and the airflow in the internal circulation air duct flows through the optical assembly and the first heat dissipation assembly. Therefore, by the plurality of heat dissipation columns arranged at intervals and extending inward from the inner surface of the shell, the heat dissipation area of the first heat dissipation piece and the turbulence effect of the airflow through the first heat dissipation piece are facilitated to be improved, so that the heat dissipation efficiency of the internal circulation air duct of the projection light machine is improved.

Description

Technical Field

[0001] This invention relates to the field of projection technology, and in particular to a projection optical engine and projection device. Background Technology

[0002] A projection optical engine is a display device that can produce large-screen images. Its core imaging principle is to use optical components to convert the illumination beam emitted by the LED light source into an image beam.

[0003] With the continuous advancement of projection technology, the brightness of projection optical engines has been significantly improved. However, this has also brought greater temperature challenges. During the operation of a projection optical engine, the optical components generate a large amount of heat. When operating in high-temperature environments, the performance of these components degrades considerably, thus affecting the display effect. To ensure the stability of the optical components and extend their lifespan, heat dissipation components are necessary. However, the heat dissipation effect of these components on the optical components needs further improvement. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a projection optical engine and a projection device, wherein the projection optical engine has multiple heat dissipation columns extending inward from the inner surface of the housing and arranged at intervals, which facilitates the increase of the heat dissipation area of ​​the first heat dissipation component and the turbulence effect of airflow through the first heat dissipation component, thereby improving the heat dissipation efficiency of the internal circulation channel of the projection optical engine.

[0005] According to a first aspect embodiment of the present invention, the projection optical engine includes a housing, an optical component, a first heat dissipation component, and an internal circulation fan. The optical component is disposed on the housing and defines an internal circulation channel between itself and the surface of the housing. The first heat dissipation component is disposed on the housing and includes a first heat dissipation element disposed on the inner surface of the housing corresponding to the internal circulation channel. The first heat dissipation element includes a plurality of spaced heat dissipation columns, each heat dissipation column extending inward from the inner surface of the housing. The internal circulation fan is disposed within the internal circulation channel and is used to drive the airflow within the internal circulation channel. The airflow within the internal circulation channel flows through the optical component and the first heat dissipation component.

[0006] According to an embodiment of the present invention, the first heat dissipation component includes a plurality of spaced heat dissipation columns, which helps to reduce airflow resistance during the flow process. At the same time, the arrangement of the heat dissipation columns can improve the turbulence effect of airflow passing through the first heat dissipation component. The heat dissipation columns extend inward from the inner surface of the housing, which facilitates increasing the heat dissipation area of ​​the first heat dissipation component, so that the heat exchange between the airflow in the inner circulation channel and the first heat dissipation component is greater, thereby effectively reducing the temperature of the optical component and improving the stability and service life of the optical component during operation.

[0007] In some embodiments, the first heat sink is configured to satisfy at least one of the following conditions: Condition A1, the plurality of heat sink columns are arranged axially parallel, and the angle between the axial direction of each heat sink column and the corresponding position on the inner surface of the housing is α, 40°≤α≤90°; Condition A2, the axial length of the heat sink column is H, 4mm≤H≤12mm; Condition A3, the cross-sectional area of ​​the heat sink column is S, 1.5mm². 2 ≤S≤3mm 2 Condition A4: The cross-sectional shape of the heat dissipation column is circular or polygonal.

[0008] In some embodiments, the internal circulation channel includes a first flow channel section, a second flow channel section, a third flow channel section, a first transition section, and a second transition section. The internal circulation fan is disposed between the first flow channel section and the second flow channel section. The first flow channel section is located on one side of the axial direction of the internal circulation fan and is opposite to the internal circulation fan along the axial direction of the internal circulation fan. The outlet of the first flow channel section is connected to the air inlet of the internal circulation fan. The inlet of the first flow channel section is bent and connected to the outlet of the third flow channel section through the first transition section. The second and third flow channel sections are both located on the other side of the axial direction of the internal circulation fan, and the second, third, and first transition sections are located on the same side of the internal circulation fan in a first direction. The second and third flow channel sections are stacked at intervals along the first direction, and the inlet of the second flow channel section is connected to the air outlet of the internal circulation fan. The outlet of the second flow channel section is bent and connected to the inlet of the third flow channel section through the second transition section. The first direction is perpendicular to the axial direction of the internal circulation fan.

[0009] In some embodiments, the housing includes a first housing portion, a second housing portion, and a third housing portion connected in sequence. The first housing portion corresponds to a first transition section, the second housing portion and the third housing portion correspond to a first flow channel section and are disposed opposite to the internal circulation fan along the axial direction of the internal circulation fan, and the third housing portion is located on the side of the central axis of the internal circulation fan away from the first housing portion in a first direction. At least one of the first housing portion, the second housing portion and the third housing portion has a plurality of spaced heat dissipation columns on its inner surface.

[0010] In some embodiments, the heat dissipation pillars provided on the inner surface of the first shell are first heat dissipation pillars, the heat dissipation pillars provided on the inner surface of the second shell are second heat dissipation pillars, and the heat dissipation pillars provided on the inner surface of the third shell are third heat dissipation pillars. The arrangement density of the plurality of first heat dissipation pillars in the first shell and the arrangement density of the plurality of third heat dissipation pillars in the third shell are both less than the arrangement density of the plurality of second heat dissipation pillars in the second shell.

[0011] In some embodiments, a plurality of first heat dissipation columns spaced apart along a second direction constitute a first heat dissipation radiator, the first heat dissipation radiator is multi-row and spaced apart along the first direction; a plurality of second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation radiator, the second heat dissipation radiator is multi-row and spaced apart along the first direction; a plurality of third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation radiator, the third heat dissipation radiator is multi-row and spaced apart along the first direction; the first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively; the distance between two adjacent first heat dissipation columns in the first heat dissipation radiator is h1, the distance between two adjacent rows of first heat dissipation radiators is v1; the distance between two adjacent second heat dissipation columns in the second heat dissipation radiator is h2, the distance between two adjacent rows of second heat dissipation radiators is v2; the distance between two adjacent third heat dissipation columns in the third heat dissipation radiator is h3, the distance between two adjacent rows of third heat dissipation radiators is v3; h1 and h3 are both greater than or equal to h2, and v1 and v3 are both greater than or equal to v2.

[0012] In some embodiments, 0.76≤h1 / v1≤0.82, 2.08≤h2 / v2≤2.35, 0.8≤h3 / v3≤0.9; and / or, 4.5mm≤h1≤5mm, 5.5mm≤v1≤7.5mm, 7.5mm≤h2≤8.5mm, 2.25mm≤v2≤2.75mm, 4.5mm≤h3≤5mm, 5mm≤v3≤6mm.

[0013] In some embodiments, the heat dissipation column provided on the inner surface of the second shell is a second heat dissipation column. The second shell has a first arrangement area and a second arrangement area. The first arrangement area and the second arrangement area are respectively provided with a plurality of second heat dissipation columns. At least a portion of the first arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan. The second arrangement area is located on the outer periphery of the first arrangement area and is offset from the air inlet of the internal circulation fan. The arrangement density of the plurality of second heat dissipation columns in the first arrangement area is greater than the arrangement density of the plurality of second heat dissipation columns in the second arrangement area. And / or, the area of ​​the first arrangement area is A1, the area of ​​the second arrangement area is A2, and A1 / (A1+A2)≥1 / 5.

[0014] In some embodiments, for the first arrangement area and the second arrangement area, a plurality of second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation row. The second heat dissipation row consists of multiple rows spaced apart along the first direction. The distance between two adjacent second heat dissipation columns of the second heat dissipation row in the first arrangement area is h21, and the distance between two adjacent second heat dissipation columns of the second heat dissipation row in the second arrangement area is h22. 0.8≤h21 / h22≤0.83. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively.

[0015] In some embodiments, the heat dissipation column provided on the inner surface of the third shell is a third heat dissipation column. The third shell has a third arrangement area and a fourth arrangement area. The third arrangement area and the fourth arrangement area are respectively provided with a plurality of third heat dissipation columns. At least a portion of the third arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan. The fourth arrangement area is located on the outer periphery of the third arrangement area and is offset from the air inlet of the internal circulation fan. The arrangement density of the plurality of third heat dissipation columns in the third arrangement area is greater than the arrangement density of the plurality of third heat dissipation columns in the fourth arrangement area; and / or, the area of ​​the third arrangement area is A3, the area of ​​the fourth arrangement area is A4, and A3 / (A3+A4)≥1 / 6.

[0016] In some embodiments, for the third arrangement area and the fourth arrangement area, a plurality of third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation duct. The third heat dissipation duct is multiple and spaced apart along the first direction. The distance between two adjacent third heat dissipation columns of the third heat dissipation duct in the third arrangement area is h31, and the distance between two adjacent third heat dissipation columns of the third heat dissipation duct in the fourth arrangement area is h32. 0.78≤h31 / h32≤0.81. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively.

[0017] In some embodiments, the heat dissipation column provided on the inner surface of the first shell is the first heat dissipation column, the heat dissipation column provided on the inner surface of the second shell is the second heat dissipation column, and the heat dissipation column provided on the inner surface of the third shell is the third heat dissipation column. A plurality of first heat dissipation columns spaced apart along the second direction constitute a first heat dissipation row. The first heat dissipation row is multi-row and spaced apart along the first direction. A plurality of second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation row. The second heat dissipation row is multi-row and spaced apart along the first direction. A plurality of third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation row. The third heat dissipation row is multi-row and spaced apart along the first direction. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively. The first heat dissipation component is configured to satisfy at least one of the following conditions: Condition B1, the first heat dissipation columns of two adjacent rows of first heat dissipation rows are staggered in the second direction; Condition B2, the second heat dissipation columns of two adjacent rows of second heat dissipation rows are staggered in the second direction; Condition B3, at least a portion of the third heat dissipation columns of two adjacent rows of third heat dissipation rows are staggered in the second direction.

[0018] In some embodiments, the first heat sink is configured to satisfy at least one of the following conditions: Condition C1, the first heat sink satisfies condition B1, the misalignment distance between two adjacent rows of first heat sinks is 0.4 to 0.6 times the distance between two adjacent first heat sink columns of the first heat sink; Condition C2, the first heat sink satisfies condition B2, the misalignment distance between two adjacent rows of second heat sinks is 0.4 to 0.6 times the distance between two adjacent second heat sink columns of the second heat sink; Condition C3, the first heat sink satisfies condition B3, the misalignment distance between two adjacent rows of third heat sinks is 0.6 to 0.7 times the distance between two adjacent third heat sink columns of the third heat sink.

[0019] In some embodiments, the first heat sink satisfies condition B2, the second heat sink has three or more rows, and in the first direction along the direction from the first shell to the second shell, the nth row of the second heat sink is adjacent to the (n+1)th row of the second heat sink relative to the (n-1)th row of the second heat sink, where n is a positive even number.

[0020] In some embodiments, the distance between the second heat dissipation bar in the nth row and the second heat dissipation bar in the (n-1)th row is v21, and the distance between the second heat dissipation bar in the (n-1)th row and the second heat dissipation bar in the (n+1)th row is v22, where 0.7 ≤ v21 / v22 ≤ 0.74.

[0021] In some embodiments, the first heat sink satisfies condition B3, the third housing has a third arrangement area and a fourth arrangement area, the third arrangement area and the fourth arrangement area are respectively provided with a plurality of third heat sink columns, at least a portion of the third arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan, the fourth arrangement area is located on the outer periphery of the third arrangement area and is offset from the air inlet of the internal circulation fan, the third heat sink columns of two adjacent rows of third heat sinks in the third arrangement area are offset in the second direction, and the third heat sink columns of two adjacent rows of third heat sinks in the fourth arrangement area are opposite to each other in the first direction.

[0022] In some embodiments, the heat dissipation column provided on the inner surface of the first shell is the first heat dissipation column, the heat dissipation column provided on the inner surface of the second shell is the second heat dissipation column, and the heat dissipation column provided on the inner surface of the third shell is the third heat dissipation column. A plurality of first heat dissipation columns spaced apart along the second direction constitute a first heat dissipation row. The first heat dissipation row consists of multiple rows spaced apart along the first direction. A plurality of second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation row. The second heat dissipation row consists of multiple rows spaced apart along the first direction. A plurality of third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation row. The third heat dissipation row consists of multiple rows spaced apart along the first direction. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively. The distance between adjacent first heat dissipation rows and second heat dissipation rows is M. The distance between two adjacent rows of first heat dissipation rows is v1, 0.8≤M / v1≤0.9; and / or, the distance between adjacent second heat dissipation rows and third heat dissipation rows is N. The distance between two adjacent rows of third heat dissipation rows is v3, 0.9≤N / v3≤1.

[0023] In some embodiments, the inner surface of the first shell is an arc surface, the inner surface of the second shell is a plane parallel to the first direction and smoothly transitions to the inner surface of the first shell, the inner surface of the third shell extends obliquely in the first direction away from the second shell toward the direction closer to the internal circulation fan, and the axial direction of all heat dissipation columns is perpendicular to the inner surface of the second shell.

[0024] In some embodiments, the plurality of heat dissipation columns include a first heat dissipation column, a second heat dissipation column, and a third heat dissipation column, wherein the height of the first heat dissipation column is H1, the height of the second heat dissipation column is H2, and the height of the third heat dissipation column is H3, wherein 10mm≤H1≤12mm, 9.5mm≤H2≤10.5mm, and 4mm≤H3≤9mm.

[0025] In some embodiments, the internal circulation fan is a centrifugal fan.

[0026] In some embodiments, a portion of the first flow channel section is located on one side of the axial direction of the internal circulation fan, and another portion is located on one side of the internal circulation fan in the first direction. The second flow channel section is located on the other side of the axial direction of the internal circulation fan and is offset on one side of the internal circulation fan in the first direction, which is perpendicular to the axial direction of the internal circulation fan.

[0027] In some embodiments, the dimension L1 occupied by the second flow channel section in the first direction and the dimension L2 of the internal circulation fan in the first direction satisfy 0.2≤L1 / L2≤0.3.

[0028] In some embodiments, the second flow channel segment includes a first flow path and a second flow path connected in series. The first flow path includes a first branch and a second branch connected in parallel. The optical components include an LCD screen, a front Fresnel lens, a heat-insulating glass, and a rear Fresnel lens. The front Fresnel lens, the LCD screen, the heat-insulating glass, and the rear Fresnel lens are spaced apart along a first direction so that a second flow path is defined between the front Fresnel lens and the LCD screen, a first branch is defined between the LCD screen and the heat-insulating glass, and a second branch is defined between the heat-insulating glass and the rear Fresnel lens.

[0029] In some embodiments, the projection optical engine includes a lens, an LED light source, and a light funnel. The lens and the LED light source are arranged correspondingly along the optical path. An optical component is disposed between the lens and the LED light source. The light funnel is disposed between the optical component and the LED light source, with the larger end of the light funnel facing the optical component and the smaller end facing the LED light source.

[0030] In some embodiments, the projection optical engine further includes a second heat dissipation component and an external circulation fan. The second heat dissipation component is disposed outside the housing and located on the side of the light funnel away from the internal circulation fan, and is used for heat exchange with the LED light source. The external circulation fan is disposed between the light funnel and the second heat dissipation component and is used to drive airflow through the second heat dissipation component.

[0031] In some embodiments, the first heat dissipation assembly further includes a second heat dissipation element disposed on the outer surface of the housing. The second heat dissipation element is disposed opposite to the first heat dissipation element, and the second heat dissipation element includes a plurality of spaced fins. The extension direction of each fin is consistent with the direction of airflow in the inner circulation channel flowing through the first heat dissipation element.

[0032] In some embodiments, the housing includes a first housing and a second housing, which are fastened together, and a first heat dissipation assembly is disposed on the first housing and is integral with the first housing.

[0033] A projection device according to a second aspect of the present invention includes a projection optical engine according to a first aspect of the present invention.

[0034] According to the projection device of the present invention, by employing the above-described projection optical engine, the stability of the projection device operation is improved.

[0035] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a schematic diagram of a projection optical engine according to some embodiments of the invention;

[0038] Figure 2 yes Figure 1 A schematic diagram of the first heat sink shown;

[0039] Figure 3 yes Figure 2 Another schematic diagram of the first heat sink shown;

[0040] Figure 4 yes Figure 2 Another schematic diagram of the first heat sink shown;

[0041] Figure 5 yes Figure 1 Another schematic diagram of the first heat sink shown;

[0042] Figure 6 yes Figure 1 Another schematic diagram of the first heat sink shown;

[0043] Figure 7 yes Figure 6 Another schematic diagram of the first heat sink shown;

[0044] Figure 8 yes Figure 1 Another schematic diagram of the first heat sink shown;

[0045] Figure 9 yes Figure 8 Another schematic diagram of the first heat sink shown;

[0046] Figure 10 yes Figure 9 A cross-sectional view of the first heat sink shown;

[0047] Figure 11 yes Figure 10 Enlarged view of point D in the middle;

[0048] Figure 12 yes Figure 1 The diagram shows the assembly of the first heat sink and the fan. The area between the two dashed circles in the diagram is the air inlet of the internal circulation fan. The blank area formed by blocking the heat sink column can be understood as the internal circulation fan.

[0049] Figure 13 yes Figure 1 Another assembly diagram of the first heat sink and fan shown;

[0050] Figure 14 yes Figure 12 Another assembly diagram of the first heat sink and fan shown;

[0051] Figure 15 yes Figure 14 A cross-sectional view of the first heat sink and fan assembly shown in the figure;

[0052] Figure 16 yes Figure 1 A schematic diagram of the second heat sink shown;

[0053] Figure 17 yes Figure 16 Another schematic diagram of the second heat sink shown;

[0054] Figure 18 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0055] Figure 19 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0056] Figure 20 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0057] Figure 21 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0058] Figure 22 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0059] Figure 23 yes Figure 1 Another schematic diagram of the projection optical engine shown;

[0060] Figure 24 This is a projection optical engine airflow velocity distribution diagram according to an embodiment of this application;

[0061] Figure 25 This is a temperature distribution diagram of the optical components in the projection optical engine according to an embodiment of this application;

[0062] Figure 26 This is a projection optical engine airflow velocity distribution diagram according to an embodiment of this application;

[0063] Figure 27 This is a temperature distribution diagram of the optical components in the projection optical engine of this application embodiment.

[0064] Figure label:

[0065] Projector Optical Engine 2

[0066] Shell 10, internal circulation channel 14, first flow channel section 140, second flow channel section 142, first flow path 1420, first branch path 1420, second branch path 1422, third flow channel section 144, first transition section 146, second transition section 148, first shell portion 15, arc surface 150, second shell portion 16, first arrangement area 160, second arrangement area 162, third shell portion 17, third arrangement area 170, fourth arrangement area 172, first shell 18, second shell 19.

[0067] Optical components 20, LCD screen 200, front Fresnel lens 220, heat-insulating glass 240, rear Fresnel lens 260,

[0068] First heat dissipation component 30, first heat dissipation element 32, heat dissipation column 320, first heat dissipation column 3200, first heat dissipation radiator 3201, second heat dissipation column 3202, second heat dissipation radiator 3203, third heat dissipation column 3204, third heat dissipation radiator 3205, second heat dissipation element 34, fins 340, internal circulation fan 40, lens 50, LED light source 52, light funnel 54, second heat dissipation component 56, external circulation fan 58. Detailed Implementation

[0069] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0070] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0071] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0072] Hereinafter, with reference to the accompanying drawings, a projection optical engine 2 according to a first aspect embodiment of the present invention will be described.

[0073] like Figure 1 As shown, according to a first aspect embodiment of the present invention, the projection optical engine 2 includes a housing 10, an optical component 20, a first heat dissipation component 30, and an internal circulation fan 40. The optical component 20 is disposed on the housing 10, and the optical component 20 and the surface of the housing 10 define an internal circulation channel 14. The first heat dissipation component 30 is disposed on the housing 10, and the first heat dissipation component 30 includes a first heat dissipation element 32 disposed on the inner surface of the housing 10. The inner surface of the housing 10 corresponds to the internal circulation channel 14, or in other words, the side surface of the housing 10 facing the internal circulation channel 14 is the inner surface of the housing 10. The first heat dissipation element 32 includes a plurality of spaced heat dissipation columns 320, each heat dissipation column 320 extending inward from the inner surface of the housing 10. The internal circulation fan 40 is disposed in the internal circulation channel 14, and the internal circulation fan 40 is used to drive the airflow in the internal circulation channel 14. The airflow in the internal circulation channel 14 flows through the optical component 20 and the first heat dissipation component 30.

[0074] As can be seen, the first heat sink 32 includes multiple spaced heat sink columns 320, which helps reduce the resistance of airflow when passing through the first heat sink 32. Simultaneously, the arrangement of the heat sink columns 320 improves the turbulence effect of airflow through the first heat sink 32. Each heat sink column 320 extends inward from the inner surface of the housing 10, facilitating an increase in the heat dissipation area of ​​the first heat sink 32. By increasing the heat dissipation area of ​​the first heat sink 32 and improving the turbulence effect of airflow through it, the heat exchange between the airflow in the inner circulation channel 14 and the first heat sink 32 is greater. Since the airflow in the inner circulation channel 14 flows through the optical component 20 and the first heat sink 30, the airflow in the inner circulation channel 14, through heat exchange with the first heat sink 32, results in a lower temperature airflow flowing towards the optical component 20. This lower-temperature airflow can absorb and carry away the heat generated by the optical component 20, thereby reducing the operating temperature of the optical component 20 and minimizing performance degradation or damage caused by overheating. Subsequently, the airflow that has absorbed heat continues to flow in the inner circulation channel 14, passes through the first heat dissipation component 30 again, and transfers the heat to the first heat dissipation element 32. The first heat dissipation element 32 transfers the heat of the airflow to the outside of the housing 10 by thermal conduction, so as to cool the airflow inside the inner circulation channel 14.

[0075] This process constitutes a complete heat dissipation cycle, in which the heat generated by the optical component 20 is carried away by the low-temperature airflow, the airflow then releases heat in the first heat dissipation component 30, and after being cooled, flows back to the optical component 20. This cycle repeats itself, which improves the heat dissipation efficiency of the inner circulation channel 14 and can effectively reduce the temperature of the optical component 20 during operation, thereby improving the stability and service life of the optical component 20 during operation.

[0076] The heat dissipation column 320 is located on the inner surface of the housing 10, eliminating the need for additional heat dissipation space. This makes the structure of the entire projection optical engine 2 more compact, which helps to reduce the size of the projection optical engine 2 and improve its portability and space utilization.

[0077] The arrangement of the multiple heat dissipation pillars 320 is not specifically limited in this embodiment. For example, the multiple heat dissipation pillars 320 can be arranged along a first direction (such as...). Figure 2 (in the AA' direction) and / or the second direction (e.g.) Figure 3 The optical components 20 can be arranged in multiple rows and columns, either in the direction of BB' or in the direction of BB'. The arrangement of multiple heat dissipation columns 320 improves the turbulence effect of airflow through the first heat dissipation component 32, increases the heat exchange between the airflow in the inner circulation channel 14 and the first heat dissipation component 32, and thus effectively reduces the temperature of the optical components 20 during operation.

[0078] In addition, an internal circulation fan 40 is provided in the internal circulation channel 14. The internal circulation fan 40 can drive the airflow circulation in the internal circulation channel 14. That is, the internal circulation fan 40 drives the airflow to flow through the optical component 20 and the first heat dissipation component 30 at a certain speed and flow rate, which accelerates the heat transfer speed and improves the heat exchange efficiency. This allows the heat generated by the optical component 20 to be carried away and released to the external environment more quickly. Moreover, the internal circulation fan 40 is located in the housing 10. Compared with traditional heat dissipation methods (such as external fans), the internal circulation fan 40 works in the closed internal circulation channel 14, which can reduce the transmission of noise and make the projection optical engine 2 quieter during operation, thus improving the user experience.

[0079] Compared to some technologies where the projection optical engine has multiple spaced elongated straight ribs on the inner surface of the shell, and the airflow in the inner circulation channel exchanges heat with the straight ribs, the turbulence effect of the airflow passing through the straight ribs is relatively limited, the first heat sink 32 of this embodiment of the invention has multiple heat sink columns 320, which makes the turbulence effect of the airflow passing through the first heat sink 32 better, thereby improving the heat exchange between the airflow in the inner circulation channel 14 and the first heat sink 32, effectively reducing the temperature of the optical component 20 during operation, and improving the stability and service life of the optical component 20 during operation.

[0080] like Figures 2-11 As shown, in some embodiments, the first heat sink 32 is configured to satisfy at least one of the following conditions:

[0081] Condition A1, axial direction of multiple heat dissipation columns 320 (e.g.) Figure 4The heat sinks are arranged parallel to each other in the CC' direction. The angle between the axial direction of each heat sink 320 and the corresponding position of the heat sink 320 on the inner surface of the housing 10 is α, 40°≤α≤90°, for example, α is 40°, 60°, 75°, 80° or 90°. The optical component 20 and the surface of the housing 10 define an inner circulation channel 14. The angle between each heat dissipation column 320 and the inner surface of the housing 10 corresponding to the location of the heat dissipation column 320 is α. α can vary from 40° to 90° depending on the location of the heat dissipation column 320. When the angle α formed by the heat dissipation column 320 and the inner surface of the housing 10 is within this range, it is beneficial to increase the contact area between the heat dissipation column 320 and the airflow in the inner circulation and enhance the turbulence effect, thereby enhancing the heat exchange effect. As the angle α increases, the side of the heat dissipation column 320 is exposed more to the flowing airflow, which is beneficial to the rapid dissipation of heat. At the same time, when the angle α decreases, the angle formed by the heat dissipation column 320 and the housing 10 can guide the airflow, so that the airflow can flow evenly through the first heat dissipation component 30, further improving the heat dissipation efficiency.

[0082] Condition A2: The axial length of the heat dissipation column 320 is H, where 4mm ≤ H ≤ 12mm. For example, H can be 4mm, 6mm, 9mm, 11mm, or 12mm. H can vary within the range of 4mm to 12mm depending on the location of the heat dissipation column 320. When H is too small (H < 4mm), the heat dissipation column 320 may not provide sufficient surface area for heat exchange with airflow, resulting in poor heat dissipation. When H is too large (H > 12mm), although the heat dissipation surface area of ​​the first heat dissipation component 32 increases, the space occupied by the first heat dissipation component 32 becomes too large. By setting H within the range of 4mm to 12mm, the heat dissipation column 320 can provide sufficient heat dissipation area while also taking into account the space occupied by the first heat dissipation component 32. It can be understood that the axial lengths of all heat dissipation columns 320 can be equal or unequal.

[0083] Condition A3: The cross-sectional area of ​​the heat sink 320 is S, 1.5 mm². 2 ≤S≤3mm 2 The cross-sectional area S of the heat dissipation column 320 affects the contact area between the first heat sink 32 and the airflow in the inner circulation channel 14. By setting the cross-sectional area of ​​the heat dissipation column 320 to 1.5 mm... 2 ~3mm 2 The range allows the heat sink 320 to have sufficient area for heat exchange with the internal circulating airflow, and the heat sink 320 is easy to process.

[0084] Condition A4: The cross-sectional shape of the heat dissipation column 320 is circular or polygonal. When the cross-section of the heat dissipation column 320 is circular, the cross-section of the circular heat dissipation column 320 is smooth and continuous, which helps to reduce the resistance encountered by the airflow when passing through the heat dissipation column 320. Moreover, the circular heat dissipation column 320 can guide the airflow more effectively and reduce the energy consumption of the projection optical engine 2. When the cross-section of the heat dissipation column 320 is polygonal, the cross-section of the polygonal heat dissipation column 320 has more edges and corners, which can increase the heat dissipation area of ​​the first heat dissipation component 32. That is, the polygonal heat dissipation column 320 can provide a larger heat dissipation area within a limited volume, so that while maintaining a compact volume, the heat dissipation column 320 can increase the heat exchange between the airflow in the inner circulation channel 14 and the first heat dissipation component 32, which is convenient for realizing the miniaturization design of the first heat dissipation component 30 and, to a certain extent, helps to enhance the turbulence effect.

[0085] It is understandable that polygons can be triangles, quadrilaterals (such as squares and rectangles), pentagons, hexagons, or even complex shapes with more sides, and users can choose according to their actual needs.

[0086] like Figure 1 As shown, in some embodiments, the internal circulation channel 14 includes a first channel section 140, a second channel section 142, a third channel section 144, a first transition section 146, and a second transition section 148. The internal circulation fan 40 is disposed between the first channel section 140 and the second channel section 142, and the first channel section 140 is located along the axial direction of the internal circulation fan 40 (e.g., axial direction). Figure 14 The first flow channel section 140 is located on one side of the internal circulation fan 40 (in the CC' direction) and is opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. The outlet of the first flow channel section 140 is connected to the air inlet of the internal circulation fan 40. The inlet of the first flow channel section 140 is connected to the outlet of the third flow channel section 144 through the first transition section 146. The second flow channel section 142 and the third flow channel section 144 are both located on the other side of the axial direction of the internal circulation fan 40. The second flow channel section 142, the third flow channel section 144 and the first transition section 146 are located on the same side of the internal circulation fan 40 in the first direction. The second flow channel section 142 and the third flow channel section 144 are stacked at intervals along the first direction. The inlet of the second flow channel section 142 is connected to the air outlet of the internal circulation fan 40. The outlet of the second flow channel section 142 is connected to the inlet of the third flow channel section 144 through the second transition section 148. The first direction is perpendicular to the axial direction of the internal circulation fan 40.

[0087] As can be seen, during the operation of the internal circulation channel 14, the airflow exits through the outlet of the third channel section 144, changes direction after passing through the first transition section 146, and enters the inlet of the first channel section 140. Subsequently, the airflow flows within the first channel section 140 until it reaches the outlet of the first channel section 140. The first channel section 140 is connected to the air inlet of the internal circulation fan 40. The internal circulation fan 40 draws in the airflow within the first channel section 140, accelerates it, and sends it into the inlet of the second channel section 142. The airflow continues to flow within the second channel section 142 and eventually exits from the outlet of the second channel section 142. Then, the airflow changes direction after passing through the second transition section 148 and re-enters the inlet of the third channel section 144, thus forming a complete internal circulation process.

[0088] The design of the first transition section 146 and the second transition section 148 enables the airflow to transition smoothly between different flow channel sections, reducing the resistance generated during the airflow process, thereby improving the smoothness and efficiency of the airflow when transitioning from one flow channel section to another.

[0089] Furthermore, the first flow channel section 140 and the second flow channel section 142 are located on opposite sides of the axial direction of the internal circulation fan 40, while the third flow channel section 144 and the second flow channel section 142 are located on the same side of the axial direction of the internal circulation fan 40. Moreover, in the first direction, the second flow channel section 142 and the third flow channel section 144 are staggered with the internal circulation fan 40, making the entire internal circulation channel 14 structure more compact and saving internal space of the projection optical engine 2, which is conducive to achieving efficient airflow circulation in a limited space. At the same time, the second flow channel section 142 and the third flow channel section 144 can free up space on the side of the internal circulation fan 40 that is axially away from the first flow channel section 140, so as to arrange other components of the projection optical engine 2 (such as the LED light source 52 and the light funnel 54 mentioned later). The design of the second flow channel section 142 and the third flow channel section 144 being stacked at intervals along the first direction is conducive to further compressing the space occupied by the second flow channel section 142 and the third flow channel section 144 in the first direction, which is conducive to realizing the miniaturization design of the projection optical engine 2.

[0090] Optionally, the internal circulation channel 14 does not have an opening connecting to the outside. That is to say, the internal circulation fan 40 drives the airflow to flow in the internal circulation channel 14, and the airflow will not flow to the outside environment, nor will the air from the outside environment flow into the internal circulation channel 14.

[0091] like Figure 1 , Figure 14 and Figure 15As shown, in some embodiments, the housing 10 includes a first housing portion 15, a second housing portion 16, and a third housing portion 17 connected in sequence. The second housing portion 16 is connected between the first housing portion 15 and the third housing portion 17. The first housing portion 15 corresponds to the first transition section 146, and the second housing portion 16 and the third housing portion 17 correspond to the first flow channel section 140. The second housing portion 16 and the third housing portion 17 are both arranged opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. The third housing portion 17 is located on the side of the central axis of the internal circulation fan 40 away from the first housing portion 15 in the first direction. At least one of the first housing portion 15, the second housing portion 16, and the third housing portion 17 has a plurality of spaced heat dissipation columns 320 on its inner surface.

[0092] It is understood that the inner surface of one of the first shell 15, the second shell 16 and the third shell 17 is provided with a plurality of spaced heat dissipation columns 320, or the inner surfaces of two of the first shell 15, the second shell 16 and the third shell 17 are provided with a plurality of spaced heat dissipation columns 320, or the inner surface of each of the first shell 15, the second shell 16 and the third shell 17 is provided with a plurality of spaced heat dissipation columns 320. Users can flexibly choose according to actual space limitations or heat exchange requirements.

[0093] As can be seen, the first shell portion 15 corresponds to the first transition section 146. The first shell portion 15 can participate in defining the first transition section 146. Thus, the first shell portion 15 and the internal circulation fan 40 are offset in the first direction, and the first shell portion 15 can be located at the corner of the internal circulation channel 14. The first shell portion 15 helps to guide the airflow more smoothly through the heat dissipation area, so that the airflow maintains an appropriate speed and direction when flowing through the heat dissipation column 320. The first shell portion 15, the second shell portion 16, and the third shell portion 17 are connected in sequence, and the airflow... The airflow flows through the first shell 15 to the second shell 16, and then through the second shell 16 to the third shell 17. The second shell 16 and the third shell 17 correspond to the first flow channel section 140, and the second shell 16 and the third shell 17 are arranged opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. This allows the airflow in the internal circulation channel 14 to exchange heat after passing through the first shell 15, the second shell 16 and the third shell 17. The cooled airflow can then dissipate heat from the optical component 40 under the action of the internal circulation fan 40.

[0094] For example, after the airflow in the inner circulation channel 14 flows through the optical component 40, it first flows through the first housing 15 so that the airflow direction can be changed at the corner position, and then guides the airflow to the second housing 16 and the third housing 17. After the airflow completes heat exchange in the second housing 16 and the third housing 17, the airflow with lower temperature flows to the optical component 40 through the inner circulation fan 40 for heat dissipation.

[0095] like Figure 2 , Figure 12 and Figure 15 As shown, in some embodiments, the housing 10 includes a first housing portion 15, a second housing portion 16, and a third housing portion 17. The first housing portion 15 is located at a corner of the inner circulation channel 14 and is offset from the inner circulation fan 40 in a first direction. At least a portion of the second housing portion 16 is disposed opposite to the inner circulation fan 40 along the axial direction of the inner circulation fan 40. The third housing portion 17 is connected to the end of the second housing portion 16 away from the first housing portion 15 in the first direction, and the third housing portion 17 is located on the central axis of the inner circulation fan 40 (e.g., ...). Figure 14 In the first direction, at least a portion of the third housing 17 is disposed opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40, and the first direction is opposite to the axial direction of the internal circulation fan 40 (e.g., the axial direction of the internal circulation fan 40). Figure 14 (The CC' direction in the text is perpendicular.)

[0096] It is understood that either the second shell 16 or the third shell 17 may be partially disposed opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40, and the other part may be disposed offset from the internal circulation fan 40 (for example, offset in the second direction). In this case, if the second shell 16 is provided with heat dissipation columns 320, then at least a portion of the heat dissipation columns 320 on the second shell 16 is opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. If the second shell 17 is provided with heat dissipation columns 320, then at least a portion of the heat dissipation columns 320 on the third shell 17 is opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. Alternatively, either the second shell 16 or the third shell 17 may be entirely disposed opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40, thereby improving the heat dissipation efficiency of the first heat dissipation component 32.

[0097] like Figures 2-8 As shown, in some embodiments, the heat dissipation pillars 320 disposed on the inner surface of the first shell portion 15 are first heat dissipation pillars 3200, the heat dissipation pillars 320 disposed on the inner surface of the second shell portion 16 are second heat dissipation pillars 3202, and the heat dissipation pillars 320 disposed on the inner surface of the third shell portion 17 are third heat dissipation pillars 3204. The arrangement density of the plurality of first heat dissipation pillars 3200 in the first shell portion 15 and the arrangement density of the plurality of third heat dissipation pillars 3204 in the third shell portion 17 are both less than the arrangement density of the plurality of second heat dissipation pillars 3202 in the second shell portion 16. Here, arrangement density can be understood as the number of heat dissipation pillars 320 disposed per unit area.

[0098] Since the first heat dissipation column 3200 is disposed on the first shell 15, which is located at the corner of the inner circulation channel 14, the system resistance is relatively large at the corner of the inner circulation channel 14. Arranging too many heat dissipation columns 320 at this location can easily increase airflow resistance, resulting in poor heat dissipation. Therefore, by reducing the arrangement density of the first heat dissipation column 3200, the airflow resistance at the corner can be reduced, allowing more airflow to pass through smoothly and transfer heat, thereby improving heat dissipation efficiency. The third heat dissipation column 3204 is disposed on the third shell 17, which is located on the side of the inner circulation fan 40 away from the first shell 15 in the first direction, and at least a portion of the third shell 17 is disposed opposite to the inner circulation fan 40. Less than half of the portion on the side where the air inlet of the fan 40 is located is opposite the third shell 17. The airflow velocity at the location of the third shell 17 is relatively slow and the resistance is relatively large. Arranging too many heat dissipation columns 320 can easily lead to more obstructed airflow in this area and insufficient heat exchange. Reducing the arrangement density of the third heat dissipation columns 3204 can reduce the poor heat dissipation effect caused by excessive resistance. The second heat dissipation column 3202 is arranged on the second shell 16. At least a portion of the second shell 16 is arranged opposite to the internal circulation fan 40 along the axial direction of the internal circulation fan 40. By increasing the arrangement density of the second heat dissipation column 3202 on the second shell 16, it is easier to improve the turbulence effect of the airflow passing through the second heat dissipation column 3202, thereby increasing the heat exchange between the airflow and the second heat dissipation column 3202.

[0099] like Figures 2-8 As shown, in some embodiments, a plurality of first heat dissipation columns 3200 spaced apart along a second direction constitute a first heat dissipation slab 3201. The first heat dissipation slab 3201 is multi-row and the multi-row first heat dissipation slab 3201 is spaced apart along the first direction. A plurality of second heat dissipation columns 3202 spaced apart along a second direction constitute a second heat dissipation slab 3203. The second heat dissipation slab 3203 is multi-row and the multi-row second heat dissipation slab 3202 is spaced apart along the first direction. A plurality of third heat dissipation columns 3204 spaced apart along a second direction constitute a third heat dissipation slab 3205. The third heat dissipation slab 3205 is multi-row and the multi-row third heat dissipation slab 3205 is spaced apart along the first direction. The first direction and the axis of the internal circulation fan 40 are perpendicular to the second direction, which simplifies the arrangement of the heat dissipation columns 320 and facilitates processing.

[0100] Among them, the distance between two adjacent first heat dissipation columns 3200 in the first heat dissipation row 3201 is h1, the distance between two adjacent first heat dissipation rows 3201 is v1, the distance between two adjacent second heat dissipation columns 3202 in the second heat dissipation row 3203 is h2, the distance between two adjacent second heat dissipation rows 3203 is v2, the distance between two adjacent third heat dissipation columns 3204 in the third heat dissipation row 3205 is h3, the distance between two adjacent third heat dissipation rows 3205 is v3, and both h1 and h3 are greater than or equal to h2, and both v1 and v3 are greater than or equal to v2.

[0101] It can be seen that the arrangement pitch of multiple second heat dissipation columns 3202 in the second heat dissipation row 3203 is less than or equal to the arrangement pitch of multiple first heat dissipation columns 3200 in the first heat dissipation row 3201 and the arrangement pitch of multiple third heat dissipation columns 3204 in the third heat dissipation row 3205. That is, the pitch between adjacent heat dissipation columns in the first heat dissipation row 3201 and the third heat dissipation row 3205 is relatively large, making the arrangement density of multiple second heat dissipation columns 3202 in the second heat dissipation row 3203 larger in the second direction, which is convenient for increasing the heat exchange amount of the airflow flowing through the second heat dissipation row 3203; the arrangement pitch of two adjacent second heat dissipation rows 3203 is less than or equal to the arrangement pitch of two adjacent first heat dissipation rows 3201 and the arrangement pitch of two adjacent third heat dissipation rows 3205. That is, the heat dissipation row pitch between adjacent first heat dissipation rows 3201 and adjacent third heat dissipation rows 3205 is relatively large, making the arrangement density of multiple second heat dissipation columns 3202 in the second heat dissipation row 3203 larger in the first direction, which is convenient for increasing the heat exchange amount of the airflow flowing through the second heat dissipation row 3203.

[0102] Such as Figures 2-8 As shown, in some embodiments, 0.76 ≤ h1 / v1 ≤ 0.82, 2.08 ≤ h2 / v2 ≤ 2.35, 0.8 ≤ h3 / v3 ≤ 0.9, that is, h1 / v1 < h2 / v2, h3 / v3 < h2 / v2. The arrangement density of the second heat dissipation columns 3202 on the second housing 16 is greater than the arrangement density of the first heat dissipation columns 3200 on the first housing 15 and the arrangement density of the third heat dissipation columns 3204 on the third housing 17, which is convenient for improving the flow disturbance effect of the airflow in the internal circulation channel 14 passing through the second heat dissipation columns 3202, thereby increasing the heat exchange amount between the airflow and the second heat dissipation columns 3202; and / or, 4.5 mm ≤ h1 ≤ 5 mm, 5.5 mm ≤ v1 ≤ 7.5 mm, 7.5 mm ≤ h2 ≤ 8.5 mm, 2.25 mm ≤ v2 ≤ 2.75 mm, 4.5 mm ≤ h3 ≤ 5 mm, 5 mm ≤ v3 ≤ 6 mm.

[0103] It is understandable that, based on the position of the first shell 15, when the distance between two adjacent first heat dissipation pillars 3200 is too small (e.g., h1 < 4.5 mm), the resistance to airflow over the first heat dissipation pillars 3200 is likely to increase, leading to poor airflow and ineffective heat dissipation. When the distance between two adjacent first heat dissipation pillars 3200 is too large (e.g., h1 > 5 mm), the airflow over the first heat dissipation pillars 3200 may not form effective wind resistance, and the airflow may be too fast, failing to fully exchange heat with the surface of the first heat dissipation pillars 3200, which will also lead to ineffective heat dissipation. By setting the distance h1 between two adjacent first heat dissipation pillars 3200 in the range of 4.5 mm to 5 mm, the airflow over the first heat dissipation pillars 3200 will form appropriate wind resistance, which helps the airflow stay on the surface of the first heat dissipation pillars 3200 for a longer time, thereby more effectively exchanging heat with the first heat dissipation pillars 3200.

[0104] Based on the position of the first shell 15, when the distance between two adjacent rows of first heat dissipation vents 3201 is too small (e.g., v1 < 5.5 mm), the resistance of airflow over the first heat dissipation vents 3201 is likely to increase, which can easily lead to poor airflow and poor heat dissipation. When the distance between two adjacent rows of first heat dissipation vents 3201 is too large (e.g., v1 > 7.5 mm), the airflow over the first heat dissipation column 3200 may not form effective wind resistance, and the airflow is too fast, which cannot fully exchange heat with the surface of the first heat dissipation vents 3201, which will also lead to poor heat dissipation. By setting the distance v1 between two adjacent rows of first heat dissipation vents 3201 in the range of 5.5 mm to 7.5 mm, the airflow over the first heat dissipation vents 3201 will form appropriate wind resistance, which helps the airflow stay on the surface of the first heat dissipation vents 3201 for a longer time, thereby exchanging heat with the first heat dissipation vents 3201 more effectively.

[0105] Based on the position of the second shell 16, when the distance between two adjacent second heat dissipation pillars 3202 is too small (e.g., h2 < 7.5 mm), the resistance to airflow over the second heat dissipation pillars 3202 is likely to increase, leading to poor airflow and ineffective heat dissipation. When the distance between two adjacent second heat dissipation pillars 3202 is too large (e.g., h2 > 8.5 mm), the airflow over the second heat dissipation pillars 3202 may not form effective wind resistance, and the airflow is too fast, failing to fully exchange heat with the surface of the second heat dissipation pillars 3202, which also easily leads to ineffective heat dissipation. By setting the distance h2 between two adjacent second heat dissipation pillars 3202 in the range of 7.5 mm to 8.5 mm, the airflow over the second heat dissipation pillars 3202 will form appropriate wind resistance, which helps the airflow stay on the surface of the second heat dissipation pillars 3202 for a longer time, thereby more effectively exchanging heat with the second heat dissipation pillars 3202.

[0106] Based on the position of the second shell 16, when the distance between two adjacent rows of second heat dissipation vents 3203 is too small (e.g., v2 < 2.25 mm), the resistance to airflow over the second heat dissipation vents 3203 is likely to increase, leading to poor airflow and ineffective heat dissipation. When the distance between two adjacent rows of second heat dissipation vents 3203 is too large (e.g., v2 > 2.75 mm), the airflow over the second heat dissipation column 3202 may not form effective wind resistance, and the airflow may be too fast, failing to fully exchange heat with the surface of the second heat dissipation vents 3203, which also easily leads to ineffective heat dissipation. By setting the distance v2 between two adjacent rows of second heat dissipation vents 3203 in the range of 2.25 mm to 2.75 mm, the airflow over the second heat dissipation vents 3203 will form appropriate wind resistance, which helps the airflow stay on the surface of the second heat dissipation vents 3203 for a longer time, thereby more effectively exchanging heat with the second heat dissipation vents 3203.

[0107] Based on the position of the third shell 17, when the distance between two adjacent third heat dissipation pillars 3204 is too small (e.g., h3 < 4.5 mm), the resistance to airflow over the third heat dissipation pillars 3204 will increase, easily leading to poor airflow and ineffective heat dissipation. When the distance between two adjacent third heat dissipation pillars 3204 is too large (e.g., h3 > 5 mm), the airflow over the third heat dissipation pillars 3204 may not form effective wind resistance, and the airflow will flow too fast, failing to fully exchange heat with the surface of the third heat dissipation pillars 3204, which will also easily lead to ineffective heat dissipation. By setting the distance h3 between two adjacent third heat dissipation pillars 3204 in the range of 4.5 mm to 5 mm, the airflow over the third heat dissipation pillars 3204 will form appropriate wind resistance, which helps the airflow stay on the surface of the third heat dissipation pillars 3204 for a longer time, thereby more effectively exchanging heat with the third heat dissipation pillars 3204.

[0108] Based on the position of the third shell 17, when the distance between two adjacent rows of third heat dissipation radiators 3205 is too small (e.g., v3 < 5 mm), the resistance to airflow over the third heat dissipation radiators 3205 will increase, easily leading to poor airflow and ineffective heat dissipation. When the distance between two adjacent rows of third heat dissipation radiators 3205 is too large (e.g., v3 > 6 mm), the airflow over the third heat dissipation column 3204 may not form effective wind resistance, and the airflow will be too fast, failing to fully exchange heat with the surface of the third heat dissipation radiators 3205, which will also easily lead to ineffective heat dissipation. By setting the distance v3 between two adjacent rows of third heat dissipation radiators 3205 in the range of 5 mm to 6 mm, the airflow over the third heat dissipation radiators 3205 will form appropriate wind resistance, which will help the airflow stay on the surface of the third heat dissipation radiators 3205 for a longer time, thereby more effectively exchanging heat with the third heat dissipation radiators 3205.

[0109] like Figures 12-15As shown, in some embodiments, the heat dissipation column 320 provided on the inner surface of the second shell 16 is a second heat dissipation column 3202. The second shell 16 has a first arrangement area 160 and a second arrangement area 162. The first arrangement area 160 and the second arrangement area 162 are respectively provided with a plurality of second heat dissipation columns 3202. At least a portion of the first arrangement area 160 is opposite to the air inlet of the internal circulation fan 40 along the axial direction of the internal circulation fan 40. The second arrangement area 162 is located on the outer periphery of the first arrangement area 160 and is offset from the air inlet of the internal circulation fan 40. The arrangement density of the multiple second heat dissipation columns 3202 in the first arrangement area 160 is greater than the arrangement density of the multiple second heat dissipation columns 3202 in the second arrangement area 162. Since the airflow velocity at the air inlet of the internal circulation fan 40 is high, increasing the arrangement density in the first arrangement area 160 improves the turbulence effect of the airflow passing through the first arrangement area 160 at high velocities, thereby increasing the heat exchange between the second heat dissipation columns 3202 and the airflow; and / or, the area of ​​the first arrangement area 160 is A1, and the area of ​​the second arrangement area... The area of ​​162 is A2, and A1 / (A1+A2)≥1 / 5. The first arrangement area 160 directly faces the air inlet of the internal circulation fan 40 and is a high heat dissipation efficiency area. By ensuring that the area ratio of A1 is not less than 1 / 5, the first arrangement area 160 has enough heat dissipation area to be directly impacted by the strong airflow, thereby quickly removing heat. Although the second arrangement area 162 is offset from the air inlet of the internal circulation fan 40, the airflow will still pass through the second arrangement area 162 for heat exchange, which can further disperse and remove heat.

[0110] It is understandable that different devices and application scenarios may have different requirements for the heat dissipation system. By adjusting the area ratio of A1 and A2, different heat dissipation needs can be flexibly adapted. For example, in scenarios requiring higher heat dissipation efficiency, the area ratio of A1 can be appropriately increased, while in scenarios with relatively lower heat dissipation requirements, the area ratio of A1 can be appropriately reduced to lower manufacturing costs. For example, A1 / (A1+A2) can be 0.2, 0.25, 0.27, 0.3, 0.32, 0.43, or 0.5, etc.

[0111] like Figure 8As shown, in some embodiments, for the first arrangement area 160 and the second arrangement area 162, a plurality of second heat dissipation columns 3202 spaced apart along the second direction constitute a second heat dissipation slab 3203. The second heat dissipation slab 3203 is multi-row and the multi-row second heat dissipation slab 3203 is spaced apart along the first direction. The distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation slab 3203 on the first arrangement area 160 is h21, and the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation slab 3203 on the second arrangement area 162 is h22. 0.8≤h21 / h22≤0.83. The first direction and the axis of the internal circulation fan 40 are perpendicular to the second direction, respectively.

[0112] It is evident that when the ratio of the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation radiator 3203 on the first arrangement area 160 to the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation radiator 3203 on the second arrangement area 162 is too large (e.g., 0.83 < h21 / h22 ≤ 1), the spacing of the second heat dissipation columns 3202 on the first arrangement area 160 in the second direction is not significantly different from the spacing of the second heat dissipation columns 3202 on the second arrangement area 162, and the effect of increasing turbulence through the first arrangement area 160 is limited. When the ratio of the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation radiator 3203 on the first arrangement area 160 to the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation radiator 3203 on the second arrangement area 162 is too small (e.g., h21 / h22 < 0.8), then the first arrangement area 160 will have a smaller turbulence effect. The heat dissipation columns 320 on the first arrangement area 160 will be more dense. Although this will increase the heat dissipation area and turbulence effect of the first arrangement area 160, it will also increase the flow resistance of the airflow through the first arrangement area 160 to a certain extent. The increase in flow resistance will cause the internal circulation fan 40 to consume more energy to push the airflow through the first arrangement area 160, which will increase the energy consumption of the projection optical engine 2 and increase the manufacturing difficulty. When the ratio of the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation row 3203 on the first arrangement area 160 to the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation row 3203 on the second arrangement area 162 is in the range of 0.8 to 0.83, the airflow through the first arrangement area 160 can increase the turbulence effect without significantly increasing the flow resistance, thereby achieving a good balance between heat dissipation efficiency and energy consumption.

[0113] Optionally, the distance between two adjacent rows of second heat dissipation vents 3203 on the first arrangement area 160 and the distance between two adjacent rows of second heat dissipation vents 3203 on the second arrangement area 162 are equal, which helps to maintain the uniformity and stability of airflow; of course, in other examples, the distance between two adjacent rows of second heat dissipation vents 3202 on the first arrangement area 160 and the distance between two adjacent rows of second heat dissipation vents 3203 on the second arrangement area 162 may also be unequal.

[0114] like Figures 12-15 As shown, in some embodiments, the heat dissipation column 320 provided on the inner surface of the third shell 17 is a third heat dissipation column 3204. The third shell 17 has a third arrangement region 170 and a fourth arrangement region 172. The third arrangement region 170 and the fourth arrangement region 172 are respectively provided with a plurality of third heat dissipation columns 3204. At least a portion of the third arrangement region 170 is opposite to the air inlet of the internal circulation fan 40 along the axial direction of the internal circulation fan 40. The fourth arrangement region 172 is provided on the outer periphery of the third arrangement region 170 and is offset from the air inlet of the internal circulation fan 40. The arrangement density of multiple third heat dissipation columns 3204 in the third arrangement area 170 is greater than that in the fourth arrangement area 172. Because the airflow velocity at the inlet of the internal circulation fan 40 is high, increasing the arrangement density in the third arrangement area 170 improves the turbulence effect of the airflow passing through the third arrangement area 170 at high velocities, thereby increasing the heat exchange between the third heat dissipation columns 3204 and the airflow; and / or, the area of ​​the third arrangement area 170 is A3, and the fourth arrangement area 1... The area of ​​72 is A4, and A3 / (A3+A4)≥1 / 6. The third arrangement area 170 directly faces the air inlet of the internal circulation fan 40 and is a high heat dissipation efficiency area. By ensuring that the area ratio of A3 is not less than 1 / 6, the third arrangement area 170 has enough heat dissipation area to be directly impacted by the strong airflow, thereby quickly removing heat. Although the fourth arrangement area 172 is offset from the air inlet of the internal circulation fan 40, the airflow will still pass through the fourth arrangement area 172 for heat exchange, which can further disperse and remove heat.

[0115] It is understandable that different devices and application scenarios may have different requirements for the heat dissipation system. By adjusting the area ratio of A3 and A4, different heat dissipation needs can be flexibly adapted. For example, in scenarios requiring higher heat dissipation efficiency, the area ratio of A3 can be appropriately increased, while in scenarios with relatively lower heat dissipation requirements, the area ratio of A3 can be appropriately reduced to lower manufacturing costs. For example, A3 / (A3+A4) can be 1 / 6, 0.2, 0.21, 0.25, 0.3, 0.32, or 0.4, etc.

[0116] like Figure 8As shown, in some embodiments, for the third arrangement region 170 and the fourth arrangement region 172, multiple third heat dissipation columns 3204 spaced apart along the second direction constitute a third heat dissipation radiator 3205. The third heat dissipation radiator 3205 consists of multiple rows spaced apart along the first direction. The distance between two adjacent second heat dissipation columns 3202 of the third heat dissipation radiator 3205 in the third arrangement region 170 is h31, and the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205 in the fourth arrangement region 172 is h32. 0.78 ≤ h31 / h32 ≤ 0.81. The first direction and the axial direction of the internal circulation fan 40 are perpendicular to the second direction, respectively. For example, h31 / h32 can be 0.78, 0.79, 0.8, or 0.81, etc.

[0117] It is evident that when the ratio of the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205 on the third arrangement area 170 to the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205 on the fourth arrangement area 172 is too large (0.81 < h31 / h32 ≤ 1), the spacing of the third heat dissipation columns 3204 on the third arrangement area 170 in the second direction is not significantly different from the spacing of the third heat dissipation columns 3204 on the fourth arrangement area 172 in the second direction, and the effect of increasing turbulence through the third arrangement area 170 is limited. Conversely, when the ratio of the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205 on the third arrangement area 170 to the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205 on the fourth arrangement area 172 is too small (h31 / h32 < 0.78), then... The heat dissipation columns 320 on the third arrangement area 170 will be more dense. Although this will increase the heat dissipation area and turbulence effect of the third arrangement area 170, it will also increase the flow resistance of the airflow through the third arrangement area 170 to a certain extent. The increase in flow resistance will cause the internal circulation fan 40 to consume more energy to push the airflow through the third arrangement area 170, thus increasing the energy consumption of the projection optical engine 2. When the ratio of the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation row 3205 on the third arrangement area 170 to the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation row 3205 on the fourth arrangement area 172 is in the range of 0.78 to 0.81, the airflow through the third arrangement area 170 can increase the turbulence effect without significantly increasing the flow resistance, thereby achieving a good balance between heat dissipation efficiency and energy consumption.

[0118] like Figures 2-8As shown, in some embodiments, the heat dissipation pillars 320 provided on the inner surface of the first shell portion 15 are first heat dissipation pillars 3200, the heat dissipation pillars 320 provided on the inner surface of the second shell portion 16 are second heat dissipation pillars 3202, and the heat dissipation pillars 320 provided on the inner surface of the third shell portion 17 are third heat dissipation pillars 3204. Multiple first heat dissipation pillars 3200 spaced apart along the second direction constitute a first heat dissipation array 3201. The first heat dissipation array 3201 is multi-row, and the multiple rows of first heat dissipation arrays 3201 are spaced apart along the first direction, and the multiple rows spaced apart along the second direction... The spaced-apart second heat dissipation columns 3202 constitute a second heat dissipation radiator 3203. Multiple rows of second heat dissipation radiators 3203 are spaced apart along a first direction. Multiple third heat dissipation columns 3204 spaced apart along a second direction constitute a third heat dissipation radiator 3205. Multiple rows of third heat dissipation radiators 3205 are spaced apart along a first direction. The first direction and the axial direction of the internal circulation fan 40 are perpendicular to the second direction. The first heat dissipation component 32 is configured to satisfy at least one of the following conditions:

[0119] Condition B1: If the first heat dissipation columns 3200 of two adjacent rows of first heat dissipation radiators 3201 are staggered in the second direction, then there is another row of first heat dissipation columns 3200 between any two adjacent first heat dissipation columns 3200 in any row of two adjacent rows of first heat dissipation radiators 3201. When the first heat dissipation columns 3200 in two adjacent rows of first heat dissipation columns 3200 are staggered, the airflow channel formed between them is no longer straight, but presents an interlaced or staggered structure. This helps to reduce the obstruction that the airflow may encounter when passing through the first heat dissipation radiator 3201, so that the airflow can flow more smoothly. At the same time, the staggered arrangement of the first heat dissipation columns 3200 makes the airflow need to flow along a more tortuous path when passing through the first heat dissipation radiator 3201, so that the airflow stays in the first heat dissipation radiator 3201 for a longer time, and thus the heat exchange time between the airflow and the first heat dissipation columns 3200 is also longer, which helps to improve the heat dissipation efficiency.

[0120] Condition B2: If the second heat dissipation columns 3202 of two adjacent rows of second heat dissipation radiators 3203 are staggered in the second direction, then there is another row of second heat dissipation columns 3202 between any two adjacent rows of second heat dissipation radiators 3203. When the second heat dissipation columns 3202 of two adjacent rows of second heat dissipation radiators 3202 are staggered, the airflow channel formed between them is no longer straight, but presents two kinds of interlaced or staggered structures. This helps to reduce the obstruction that the airflow may encounter when passing through the second heat dissipation radiator 3203, so that the airflow can flow more smoothly. At the same time, the staggered second heat dissipation columns 3202 make the airflow need to flow along a more tortuous path when passing through the second heat dissipation radiator 3203, so that the airflow stays in the second heat dissipation radiator 3203 for a longer time, and thus the heat exchange time between the airflow and the second heat dissipation columns 3202 is also longer, which helps to improve the heat dissipation efficiency.

[0121] If, under condition B3, at least a portion of the third heat dissipation columns 3204 of two adjacent rows of third heat dissipation radiators 3205 are misaligned in the second direction, then a portion of the third heat dissipation columns 3204 of the third heat dissipation radiator 3205 and a portion of the third heat dissipation columns 3204 of the adjacent third heat dissipation radiator 3205 are misaligned in the second direction, while the other portion can be arranged facing each other in the first direction; or, all the third heat dissipation columns 3204 of the third heat dissipation radiator 3205 and all the third heat dissipation columns 3204 of the adjacent third heat dissipation radiator 3205 are misaligned in the second direction. When at least some of the third heat dissipation columns 3204 in two adjacent rows are staggered, the airflow channel formed between them is no longer straight, but presents three interlaced or staggered structures. This helps to reduce the obstruction that the airflow may encounter when passing through the third heat dissipation column 3205, allowing the airflow to flow more smoothly. At the same time, the staggered arrangement of the third heat dissipation columns 3204 requires the airflow to flow along a more tortuous path when passing through the third heat dissipation column 3205, making the airflow stay inside the third heat dissipation column 3205 for a longer time, thus extending the heat exchange time between the airflow and the third heat dissipation column 3204 and helping to improve heat dissipation efficiency.

[0122] Optionally, the third heat dissipation radiator 3205 is located on the third housing 17. A portion of the third housing 17 (e.g., the fourth arrangement area 172 mentioned above) may be offset from the air inlet of the internal circulation fan 40. The airflow velocity is relatively low here, and the airflow through the portion of the third housing 17 that is offset from the air inlet of the internal circulation fan 40 is small. Therefore, it is not necessary to offset the third heat dissipation columns 3204 of the two adjacent rows of third heat dissipation radiators 3205 in the second direction, which simplifies the structural design and reduces costs.

[0123] like Figures 2-8 As shown, in some embodiments, the first heat sink 32 is configured to satisfy at least one of the following conditions:

[0124] Condition C1, the first heat sink 32 satisfies condition B1, the misalignment distance between two adjacent rows of first heat sinks 3201 (e.g.) Figure 5h11) is 0.4 to 0.6 times the distance between two adjacent first heat dissipation columns 3200 of the first heat dissipation radiator 3201. For example, the above ratio can be 0.4, 0.46, 0.5, 0.57 or 0.6, etc. It is understandable that when the misalignment distance between two adjacent rows of first heat dissipation radiators 3201 is greater than 0.6 times the distance between two adjacent first heat dissipation columns 3200, or when the misalignment distance between two adjacent rows of first heat dissipation radiators 3201 is less than 0.4 times the distance between two adjacent first heat dissipation columns 3200, the misalignment distance between two adjacent rows of first heat dissipation radiators 3201 is too small. The disturbance formed by the airflow when passing through the first heat dissipation radiator 3201 is relatively small, and the heat transfer efficiency is not improved. The airflow may more easily form laminar flow when passing through the first heat dissipation component 32, rather than the desired turbulent flow. The improvement of the heat exchange efficiency between the airflow and the heat dissipation column 320 is easily limited. By setting the misalignment distance to 0.4 to 0.6 times the distance between two adjacent first heat dissipation columns 3200, the airflow can form a more reasonable flow path when passing through the first heat dissipation radiator 3201. At the same time, the flow path of the airflow when passing through two adjacent first heat dissipation radiators 3201 is longer, which helps to improve the heat dissipation efficiency.

[0125] Condition C2, the first heat sink 32 satisfies condition B2, the misalignment distance between two adjacent rows of second heat sinks 3203 (e.g.) Figure 5 h21) is 0.4 to 0.6 times the distance between two adjacent second heat dissipation columns 3202 of the second heat dissipation 3203. For example, the above ratio can be 0.4, 0.44, 0.5, 0.55 or 0.6, etc. It is understandable that when the misalignment distance between two adjacent rows of second heat dissipation radiators 3203 is greater than 0.6 times the distance between two adjacent second heat dissipation columns 3202, or when the misalignment distance between two adjacent rows of second heat dissipation radiators 3203 is less than 0.4 times the distance between two adjacent second heat dissipation columns 3202, the misalignment distance between two adjacent rows of second heat dissipation radiators 3203 is too small. The disturbance formed by the airflow when passing through the second heat dissipation radiators 3203 is relatively small, and the heat transfer efficiency is not improved. The airflow may more easily form laminar flow when passing through the second heat dissipation component 34, rather than the desired turbulent flow. The improvement of the heat exchange efficiency between the airflow and the heat dissipation column 320 is easily limited. By setting the misalignment distance to 0.4 to 0.6 times the distance between two adjacent second heat dissipation columns 3202, the airflow can form a more reasonable flow path when passing through the second heat dissipation radiators 3203. At the same time, the airflow path is longer when passing through two adjacent second heat dissipation radiators 3203, which helps to improve the heat dissipation efficiency.

[0126] Condition C3, the first heat sink 32 satisfies condition B3, the misalignment distance between two adjacent rows of third heat sinks 3205 (e.g.) Figure 5h31) is 0.6 to 0.7 times the distance between two adjacent third heat dissipation columns 3204 of the third heat dissipation radiator 3205. For example, the above ratio can be 0.6, 0.63, 0.65, 0.66, 0.69 or 0.7, etc. It is understandable that when the misalignment distance between two adjacent rows of third heat dissipation radiators 3205 is greater than 0.7 times the distance between two adjacent third heat dissipation columns 3204, or when the misalignment distance between two adjacent rows of third heat dissipation radiators 3205 is less than 0.6 times the distance between two adjacent third heat dissipation columns 3204, the misalignment distance between two adjacent rows of third heat dissipation radiators 3205 is too small. The disturbance formed by the airflow when passing through the third heat dissipation radiator 3205 is small, and the heat transfer efficiency is not improved. The airflow may more easily form laminar flow when passing through the third heat dissipation component, rather than the desired turbulent flow. The improvement of heat exchange efficiency between the airflow and the heat dissipation column 320 is easily limited. By setting the misalignment distance to 0.6 to 0.7 times the distance between two adjacent third heat dissipation columns 3204, the airflow can form a more reasonable flow path when passing through the third heat dissipation radiator 3205. At the same time, the airflow path is longer when passing through two adjacent third heat dissipation radiators 3205, which helps to improve the heat dissipation efficiency.

[0127] like Figure 5 and Figure 6 As shown, in some embodiments, the first heat sink 32 satisfies condition B2, and the second heat sink 3203 has three or more rows, arranged in a first direction along the first housing portion 15 toward the second housing portion 16. The first row of second heat sinks 3203, the second row of second heat sinks 3203, ... the xth row of second heat sinks 3203 are arranged sequentially, where x is a positive integer and x≥3. The nth row of second heat sinks 3203 is adjacent to the (n+1)th row of second heat sinks 3203 relative to the (n-1)th row of second heat sinks 3203. The fact that n is a positive even number makes the distance between the second heat dissipation row 3203 in the nth row and the second heat dissipation row 3203 in the (n-1)th row larger than the distance between the second heat dissipation row 3203 in the nth row and the second heat dissipation row 3203 in the (n+1)th row. This can significantly reduce the obstruction of airflow when it flows through the second heat dissipation row 3203 in the nth row and the second heat dissipation row 3203 in the (n-1)th row, which helps the airflow pass through the heat dissipation structure more smoothly and can also increase the airflow rate, thereby improving the heat dissipation efficiency of the first heat dissipation component 32.

[0128] like Figure 5 and Figure 6As shown, in some embodiments, the distance between the second heat dissipation radiator 3203 in the nth row and the second heat dissipation radiator 3203 in the (n-1)th row is v21, and the distance between the second heat dissipation radiator 3203 in the (n-1)th row and the second heat dissipation radiator 3203 in the (n+1)th row is v22, where 0.7 ≤ v21 / v22 ≤ 0.74. For example, v21 / v22 can be 0.7, 0.71, 0.72, 0.73, or 0.74, etc. When the ratio of the distance between the second heat dissipation radiator 3203 in the nth row and the second heat dissipation radiator 3203 in the (n-1)th row to the distance between the second heat dissipation radiator 3203 in the (n-1)th row and the second heat dissipation radiator 3203 in the (n+1)th row is too small (e.g., v21 / v22 < 0.7), the distance between the second heat dissipation radiator 3203 in the (n-1)th row and the second heat dissipation radiator 3203 in the nth row decreases, which easily reduces the airflow. When the ratio of the distance between the second heat dissipation radiator 3203 in the nth row and the second heat dissipation radiator 3203 in the (n-1)th row to the distance between the second heat dissipation radiator 3203 in the (n+1)th row and the second heat dissipation radiator 3203 in the (n+1)th row is too small (e.g., v21 / v22 > 0.74), the distance between the second heat dissipation radiator 3203 in the (n-1)th row and the second heat dissipation radiator 3203 in the nth row increases, and the airflow of the second heat dissipation radiator 3203 in the nth row increases. The small distance between 3203 and the (n+1)th row of second heat dissipation radiators 3203 may cause a large airflow buffer zone to form in front of the nth row of second heat dissipation radiators 3203 when the airflow passes through the nth row of second heat dissipation radiators 3203 and the (n+1)th row of second heat dissipation radiators 3203, thus reducing the contact area between the airflow and the second heat dissipation radiators 3203. When the ratio of the distance between the nth row of second heat dissipation radiators 3203 and the (n-1)th row of second heat dissipation radiators 3203 to the distance between the (n-1)th row of second heat dissipation radiators 3203 and the (n+1)th row of second heat dissipation radiators 3203 is in the range of 0.7 to 0.74, the distribution of airflow in the second heat dissipation radiators 3203 can be better balanced. This avoids forming an excessively large airflow buffer zone or causing excessive airflow obstruction, allowing the airflow to flow more evenly through the second heat dissipation radiators 3203 and improving the heat dissipation efficiency.

[0129] like Figures 12-15As shown, in some embodiments, the first heat sink 32 satisfies condition B3, the third housing 17 has a third arrangement region 170 and a fourth arrangement region 172, the third arrangement region 170 and the fourth arrangement region 172 are respectively provided with a plurality of third heat sink columns 3204, at least a portion of the third arrangement region 170 is opposite to the air inlet of the internal circulation fan 40 along the axial direction of the internal circulation fan 40, the fourth arrangement region 172 is located on the outer periphery of the third arrangement region 170 and the fourth arrangement region 172 is offset from the air inlet of the internal circulation fan 40, the third heat sink columns 3204 of two adjacent rows of third heat sinks 3205 in the third arrangement region 170 are offset in the second direction, and the third heat sink columns 3204 of two adjacent rows of third heat sinks 3205 in the fourth arrangement region 172 are opposite to each other in the first direction.

[0130] As can be seen, the third arrangement area 170 is at least partially opposite to the air inlet of the internal circulation fan 40, resulting in a faster airflow velocity in the third arrangement area 170. By staggering the third heat dissipation columns 3204 of the two adjacent rows of third heat dissipation radiators 3205 in the second direction in the third arrangement area 170, the turbulence effect of the airflow through the third arrangement area 170 is increased, thereby improving the heat exchange between the airflow and the third heat dissipation columns 3204. The fourth arrangement area 172 is staggered from the air inlet of the internal circulation fan 40, resulting in a larger flow resistance and a smaller airflow through the fourth arrangement area 172. Therefore, it is not necessary to stagger the third heat dissipation columns 3204 of the two adjacent rows of third heat dissipation radiators 3205 in the second direction, which simplifies the structural design and reduces costs.

[0131] Optionally, the arrangement density of the plurality of third heat dissipation columns 3204 in the third arrangement area 170 is greater than the arrangement density of the plurality of third heat dissipation columns 3204 in the fourth arrangement area 172, and the third heat dissipation columns 3204 of two adjacent rows of third heat dissipation radiators 3205 in the third arrangement area 170 are staggered in the second direction, while the third heat dissipation columns 3204 of two adjacent rows of third heat dissipation radiators 3205 in the fourth arrangement area 172 are directly opposite each other along the first direction. In this embodiment, the third heat dissipation radiators 3205 in the third arrangement area 170 and the corresponding third heat dissipation radiators 3205 in the fourth arrangement area 172 can be flush with each other in the first direction or staggered in the first direction; similarly, the second heat dissipation radiators 3203 in the first arrangement area 160 and the corresponding second heat dissipation radiators 3203 in the second arrangement area 162 can be flush with each other in the first direction or staggered in the first direction.

[0132] like Figures 12-15As shown, in some embodiments, the plurality of heat dissipation pillars 320 include a first heat dissipation pillar 3200, a second heat dissipation pillar 3202 and a third heat dissipation pillar 3204. The area of ​​the plurality of first heat dissipation pillars 3200 in the arrangement area of ​​the first housing portion 15 is S1, the area of ​​the plurality of second heat dissipation pillars 3202 in the arrangement area of ​​the second housing portion 16 is S2, and the area of ​​the plurality of third heat dissipation pillars 3204 in the arrangement area of ​​the third housing portion 17 is S3, where S2 = S1 + S3.

[0133] As can be seen, the first shell 15 is located at the corner of the inner circulation channel 14 and is offset from the inner circulation fan 40, resulting in a slower airflow velocity through the first shell 15. The second shell 16 is at least partially opposite to the inner circulation fan 40, resulting in a faster airflow velocity through the second shell 16. The third shell 17 is connected to the end of the second shell 19 away from the first shell 15 in the first direction and is at least partially opposite to the inner circulation fan 40, causing the airflow through the third shell 17 to be reduced to a certain extent by first passing through the second shell 16, i.e., the airflow through the third shell 17 is less than that through the first shell 15. The airflow in the second shell 16 is such that the airflow passes through the first shell 15 to the second shell 16, and then through the second shell 16 to the third shell 17. Therefore, the main heat dissipation area of ​​the first heat sink 32 is the second shell 16. The area of ​​the second heat sink 3202 in the second shell 16 is the sum of the area of ​​the first heat sink 3200 in the first shell 15 and the area of ​​the third heat sink 3204 in the third shell 17. By making the area of ​​the second heat sink 3202 in the second shell 16 larger, the heat exchange of the airflow passing through the second shell 16 is greater, which helps to improve the heat dissipation efficiency.

[0134] like Figures 12-15As shown, in some embodiments, S1:S2:S3 = 1:3:2, then the area of ​​the third heat dissipation column 3204 in the third shell 17 is larger than the area of ​​the first heat dissipation column 3200 in the first shell 15, and the area of ​​the third heat dissipation column 3204 in the third shell 17 is smaller than the area of ​​the second heat dissipation column 3202 in the second shell 16, i.e., S1 < S2 < S3. The second shell 16, as the main heat exchange area, is designed with the second heat dissipation column 3202's area maximized to ensure sufficient heat dissipation area in the second shell 16 for heat exchange with the airflow in the inner circulation channel 14. As a secondary heat exchange area, the area of ​​the third heat dissipation column 3204 in the third shell 17 is between the area of ​​the first heat dissipation column 3200 in the first shell 15 and the area of ​​the second heat dissipation column 3202 in the second shell 16. This allows the second shell 16 to provide sufficient heat dissipation capacity without excessively increasing costs or occupying too much space. The first shell 15 is located at the corner of the inner circulation channel 14, so the heat dissipation capacity of the first shell 15 is relatively low. The area of ​​the first heat dissipation column 3200 in the first shell 15 is minimized, thus optimizing the overall structure and reducing unnecessary materials and costs.

[0135] It is understandable that for different sizes of projection optical engines 2, because the fan lengths used in projection optical engines 2 are different, the size of the first heat dissipation component 30 is also different, and the design of the corresponding first heat dissipation component 32 will also change. Users can scale the size of the first heat dissipation component 30 proportionally according to the size of the fan, and the spacing of the corresponding heat dissipation pillars 320 is also scaled proportionally.

[0136] like Figures 2-8 As shown, in some embodiments, the heat dissipation column 320 provided on the inner surface of the first shell 15 is the first heat dissipation column 3200, the heat dissipation column 320 provided on the inner surface of the second shell 16 is the second heat dissipation column 3202, and the heat dissipation column 320 provided on the inner surface of the third shell 17 is the third heat dissipation column 3204. A plurality of first heat dissipation columns 3200 spaced apart along the second direction constitute a first heat dissipation row 3201. The first heat dissipation row 3201 is multi-row and the multi-row first heat dissipation row 3201 is spaced apart along the first direction. A plurality of second heat dissipation columns 3202 spaced apart along the second direction constitute a second heat dissipation row 3203. The second heat dissipation row 3203 is multi-row and the multi-row second heat dissipation row 3203 is spaced apart along the first direction. A plurality of third heat dissipation columns 3204 spaced apart along the second direction constitute a third heat dissipation row 3205. The third heat dissipation row 3205 is multi-row and the multi-row third heat dissipation row 3205 is spaced apart along the first direction. The first direction and the axis of the internal circulation fan 40 are perpendicular to the second direction, respectively.

[0137] The distance between adjacent first heat dissipation radiators 3201 and second heat dissipation radiators 3203 is M, and the distance between two adjacent rows of first heat dissipation radiators 3201 is v1, where 0.8 ≤ M / v1 ≤ 0.9. For example, M / v1 can be 0.8, 0.83, 0.84, 0.88, or 0.9. The distance between adjacent first heat dissipation radiators 3201 and second heat dissipation radiators 3203 is less than the distance between two adjacent rows of first heat dissipation radiators 3201. When the ratio of M / v1 is too small (e.g., M / v1 < 0.8), the resistance of airflow over adjacent first heat dissipation radiators 3201 and second heat dissipation radiators 3203 will be relatively large, which may cause the internal circulation fan 40 to need to be extinguished. More energy is consumed to propel the airflow. When the M / v1 ratio is too large (e.g., M / v1 > 0.9), the airflow does not form effective wind resistance when passing through adjacent first heat sinks 3201 and second heat sinks 3203, which may lead to poor heat dissipation. This also requires increasing the fan's energy consumption to compensate. By setting the ratio of the distance between adjacent first heat sinks 3201 and second heat sinks 3203 to the distance between two adjacent rows of first heat sinks 3201 in the range of 0.8 to 0.9, the airflow can form appropriate wind resistance when passing through adjacent first heat sinks 3201 and second heat sinks 3203, helping to guide the airflow more evenly through the adjacent first heat sinks 3201 and second heat sinks 3203. Heat sinks 3201 and 3203 are provided, and appropriate air resistance can increase the contact time between the airflow and the adjacent first heat sink 3201 and second heat sink 3203, thereby improving heat exchange efficiency; and / or, the distance between adjacent second heat sinks 3203 and third heat sinks 3205 is N, and the distance between two adjacent rows of third heat sinks 3205 is v3, 0.9≤N / v3≤1, for example, N / v3 is 0.9, 0.92, 0.95, 0.98, or 1, etc. The distance between adjacent second heat sinks 3203 and third heat sinks 3205 is less than that between two adjacent rows of third heat sinks 3205, when N / v3 is... When the ratio is too small (e.g., N / v3 < 0.9), the resistance of the airflow over the adjacent second and third heat dissipation radiators 3203 and 3205 will increase, causing the internal circulation fan 40 to consume more energy to drive the airflow. When the N / v3 ratio is too large (e.g., N / v3 > 1), no effective wind resistance will be formed when the airflow over the adjacent second and third heat dissipation radiators 3203 and 3205, which may lead to poor heat dissipation. Similarly, the energy consumption of the fan needs to be increased to compensate. This can be achieved by setting the ratio of the distance between the adjacent second and third heat dissipation radiators 3203 and the distance between two adjacent rows of third heat dissipation radiators 3205 to 0.8.Within a range of 9, the airflow passing over adjacent second and third heat sinks 3203 and 3205 creates appropriate wind resistance, which helps guide the airflow more evenly through these adjacent heat sinks. Furthermore, this appropriate wind resistance increases the contact time between the airflow and the adjacent second and third heat sinks 3203 and 3205, thereby improving heat exchange efficiency.

[0138] like Figure 1 and Figure 3 As shown, in some embodiments, the inner surface of the first shell 15 is an arc surface 150, the inner surface of the second shell 16 is a plane parallel to the first direction and smoothly transitions to the inner surface of the first shell 15, the inner surface of the third shell 17 extends obliquely in the first direction away from the second shell 16 toward the direction close to the internal circulation fan 40, and the axial direction of all heat dissipation columns 320 is perpendicular to the inner surface of the second shell 16.

[0139] As can be seen, the first shell 15 is located at the corner of the inner circulation channel 14, and the inner surface of the first shell 18 is designed as an arc surface 150, which helps to guide the airflow to enter the first heat dissipation component 30 more smoothly, reducing the turbulence and eddies of the airflow at the corner, thereby improving the heat dissipation efficiency; the inner surface of the second shell 16 is a plane parallel to the first direction, and the inner surface of the arc surface 150 of the second shell 16 and the first shell 15 are smoothly transitioned, ensuring the continuity and stability of the airflow at the transition point, reducing the energy loss of the airflow during the transition process. At the same time, the axis of all heat dissipation columns 320 is perpendicular to the inner surface of the second shell 16, so that the airflow can directly impact the heat dissipation columns 320, thereby increasing the heat exchange between the inner circulation airflow and the heat dissipation columns 320; the inner surface of the third shell 17 extends inclinedly in the first direction away from the second shell 16 toward the direction closer to the inner circulation fan 40. This inclined design helps to increase the contact area and contact time between the airflow and the heat dissipation columns 320, thereby improving the heat transfer efficiency.

[0140] like Figures 9-11 As shown, in some embodiments, the plurality of heat dissipation pillars 320 include a first heat dissipation pillar 3200, a second heat dissipation pillar 3202, and a third heat dissipation pillar 3204. The height of the first heat dissipation pillar 3200 is H1, the height of the second heat dissipation pillar 3202 is H2, and the height of the third heat dissipation pillar 3204 is H3. The values ​​are: 10mm ≤ H1 ≤ 12mm, 9.5mm ≤ H2 ≤ 10.5mm, and 4mm ≤ H3 ≤ 9mm. For example, H1 can be 10mm, 10.4mm, 11mm, 11.7mm, or 12mm; H2 can be 9.5mm, 9.7mm, 10mm, 10.3mm, or 10.5mm; and H3 can be 4mm, 5mm, 5.6mm, 6mm, 7.4mm, 8mm, 8.5mm, or 9mm.

[0141] It is evident that the height of the first heat dissipation column 3200 is within the range of 10mm to 12mm. When the height of the first heat dissipation column 3200 is too small (e.g., H1 < 10mm), the airflow does not form effective wind resistance when passing through the first heat dissipation column 3200, which may lead to poor heat dissipation and require increased fan energy consumption to compensate. When the height of the first heat dissipation column 3200 is too large (e.g., H1 > 12mm), the resistance of the airflow passing through the first heat dissipation column 3200 will increase, causing the internal circulation fan 40 to consume more energy to drive the airflow. By setting the height of the first heat dissipation column 3200 within the range of 10mm to 12mm, the airflow can form appropriate wind resistance when passing through adjacent first heat dissipation columns 3200, which helps to guide the airflow to pass through the first heat dissipation column 3200 more evenly. Moreover, appropriate wind resistance can increase the contact time between the airflow and the first heat dissipation column 3200, thereby improving the heat exchange efficiency.

[0142] The height of the second heat dissipation column 3202 is within the range of 9.5mm to 10.5mm. When the height of the second heat dissipation column 3202 is too small (e.g., H2 < 9.5mm), the airflow does not form effective wind resistance when passing through the second heat dissipation column 3202, which may lead to poor heat dissipation and require increased fan energy consumption to compensate. When the height of the second heat dissipation column 3202 is too large (e.g., H2 > 10.5mm), the resistance of the airflow passing through the second heat dissipation column 3202 will increase, causing the internal circulation fan 40 to consume more energy to drive the airflow. By setting the height of the second heat dissipation column 3202 within the range of 9.5mm to 10.5mm, the airflow can form appropriate wind resistance when passing through the adjacent second heat dissipation column 3202, which helps to guide the airflow to pass through the second heat dissipation column 3202 more evenly. Moreover, appropriate wind resistance can increase the contact time between the airflow and the second heat dissipation column 3202, thereby improving the heat exchange efficiency.

[0143] The height of the third heat dissipation column 3204 is in the range of 4mm to 9mm. When the height of the third heat dissipation column 3204 is too small (e.g., H3 < 4mm), the airflow does not form effective wind resistance when passing through the third heat dissipation column 3204, which may lead to poor heat dissipation effect and require increased fan energy consumption to compensate. When the height of the third heat dissipation column 3204 is too large (e.g., H3 > 9mm), the resistance of the airflow passing through the third heat dissipation column 3204 will increase, causing the internal circulation fan 40 to consume more energy to drive the airflow. By setting the height of the third heat dissipation column 3204 in the range of 4mm to 9mm, the airflow can form appropriate wind resistance when passing through the adjacent third heat dissipation column 3204, which helps to guide the airflow to pass through the third heat dissipation column 3204 more evenly. Moreover, appropriate wind resistance can increase the contact time between the airflow and the third heat dissipation column 3204, thereby improving the heat exchange efficiency.

[0144] like Figure 1As shown, in some embodiments, the internal circulation fan 40 is a centrifugal fan. The airflow gains kinetic energy through the centrifugal action inside the centrifugal fan, which accelerates the airflow, enabling the projection optical engine to quickly respond to the heat generated by the optical component 20 and effectively dissipate the heat generated by the optical component 20 to the external environment, thereby improving the heat dissipation efficiency of the projection optical engine 2.

[0145] In some embodiments, the dimension L1 occupied by the second flow channel section 142 in the first direction and the dimension L2 of the internal circulation fan 40 in the first direction satisfy 0.2≤L1 / L2≤0.3, for example, L1 / L2 is 0.2, 0.23, 0.24, 0.26, 0.29 or 0.3, etc. When the ratio of the size occupied by the second flow channel section 142 in the first direction to the size of the internal circulation fan 40 in the first direction is too small (e.g., L1 / L2 < 0.2), the airflow channel corresponding to the second flow channel section 142 is relatively small, which can easily reduce the airflow entering the second flow channel section 142 for heat exchange, leading to a decrease in heat dissipation performance. At the same time, an excessively small second flow channel section 142 may make airflow within it difficult, increasing pressure loss and thus reducing the efficiency of the fan. When the ratio of the size occupied by the second flow channel section 142 in the first direction to the size of the internal circulation fan 40 in the first direction is too large (e.g., L1 / L2 > 0.3), the second flow channel section 142 will occupy more space, which may increase the size of the projection optical engine 2, which is not conducive to the compactness and portability of the projection optical engine 2. By setting the ratio of the size occupied by the second flow channel section 142 in the first direction to the size of the internal circulation fan 40 in the first direction within the range of 0.2 to 0.3, the second flow channel section 142 has good heat dissipation performance while optimizing the internal space utilization of the projection optical engine 2.

[0146] like Figure 1 As shown, in some embodiments, the second flow channel segment 142 includes a first branch 1420 and a second branch 1422 connected in parallel. The optical component 20 includes an LCD screen 200, a front Fresnel lens 220, a heat-insulating glass 240, and a rear Fresnel lens 260. The front Fresnel lens 220, the LCD screen 200, the heat-insulating glass 240, and the rear Fresnel lens 260 are spaced apart along a first direction, so that a third flow channel segment 144 is defined between the front Fresnel lens 220 and the LCD screen 200, the first branch 1420 is defined between the LCD screen 200 and the heat-insulating glass 240, and the second branch 1422 is defined between the heat-insulating glass 240 and the rear Fresnel lens 260.

[0147] As can be seen, the airflow with reduced temperature after passing through the first heat dissipation component 30 will flow through the parallel first branch 1420 and second branch 1422 to dissipate heat from the optical component 20. The first branch 1420 is located between the LCD screen 200 and the heat-insulating glass 240, the second branch 1422 is located between the heat-insulating glass 240 and the rear Fresnel lens 260, and the third flow channel 144 is located between the front Fresnel lens 220 and the LCD screen 200. This allows the airflow to increase the heat exchange with the heat-insulating glass 240 through the first branch 1420 and the second branch 1422, thereby more effectively reducing the temperature of the heat-insulating glass 240. At the same time, the airflow can also increase the heat exchange with the LCD screen 200 through the first branch 1420 and the third flow channel 144, thereby more effectively reducing the temperature of the heat-insulating glass 240.

[0148] The entrance of the first branch 1420 is connected to the entrance of the second branch 1422, and the exit of the first branch 1420 is connected to the exit of the second branch 1422, thus achieving parallel connection between the two. The airflow can be distributed into the first branch 1420 and the second branch 1422, respectively flowing through the area between the LCD screen 200 and the heat-insulating glass 240 and the area between the heat-insulating glass 240 and the rear mirror 260.

[0149] like Figure 1 As shown, in some embodiments, the projection optical engine 2 includes a lens 50, an LED light source 52, a light funnel 54, and a projection optical engine according to the first aspect of the present invention. The lens 50 and the LED light source 52 are arranged correspondingly along the optical path. The optical component 20 is disposed between the lens 50 and the LED light source 52. The light funnel 54 is disposed between the optical component 20 and the LED light source 52, with the large end of the light funnel 54 facing the optical component 20 and the small end facing the LED light source 52.

[0150] As can be seen, after the projection optical engine 2 is started, the LED light source 52 emits light. The light is focused by the light funnel 54, with the large end facing the optical component 20 and the small end facing the LED light source 52. Then, it passes through the optical component 20 for further adjustment, focusing, and shaping, and finally is projected onto the screen through the lens 50 to form a clear image. In this process, the projection optical engine can reduce the temperature of the internal optical component 20 of the projection optical engine 2, thereby improving the operational stability of the projection optical engine 2.

[0151] It is understood that the type of projection optical engine 2 in the embodiments of this application is not limited, and can be a vertical projection optical engine, a horizontal projection optical engine, a portable projection optical engine, a desktop projection optical engine, a short-throw projection optical engine, and a long-throw projection optical engine, etc.

[0152] like Figures 18-23As shown, in some embodiments, the projection optical engine 2 further includes a second heat dissipation component 56 and an external circulation fan 58. The second heat dissipation component 56 is disposed outside the housing 10 and is located on the side of the light funnel 54 away from the internal circulation fan 40. The second heat dissipation component 56 is used for heat exchange with the LED light source 52. The external circulation fan 58 is disposed between the light funnel 54 and the second heat dissipation component 56 and is used to drive airflow through the second heat dissipation component 56.

[0153] As can be seen, the second heat dissipation component 56 is located outside the housing 10 and exchanges heat with the LED light source 52. It can effectively absorb and disperse the heat generated by the LED light source 52 and extend the service life of the LED light source 52. At the same time, the external circulation fan 58 is located between the light funnel 54 and the second heat dissipation component 56, driving the airflow through the second heat dissipation component 56, accelerating the transfer and dissipation of heat, thereby improving the heat dissipation efficiency.

[0154] In addition, the second heat dissipation component 56 is located on the side of the light funnel 54 away from the internal circulation fan 40, and the external circulation fan 58 is located between the light funnel 54 and the second heat dissipation component 56. The internal circulation fan 40 and the external circulation fan 58 are spaced apart, which can effectively reduce the interference of the airflow generated by the internal circulation fan 40 on the second heat dissipation component 56, thereby improving the reliability of the second heat dissipation component 56.

[0155] like Figure 16 and Figure 17 As shown, in some embodiments, the first heat dissipation assembly 30 further includes a second heat dissipation element 34 disposed on the outer surface of the housing 10. The second heat dissipation element 34 is disposed opposite to the first heat dissipation element 32, and the second heat dissipation element 34 includes a plurality of spaced fins 340. The extending direction of each fin 340 is consistent with the direction of airflow in the inner circulation channel 14 through the first heat dissipation element 32, so the fins 340 can be formed into elongated shapes. It can be seen that the design of the fins 340 increases the contact area between the second heat dissipation element 34 and the airflow, thereby improving the heat exchange efficiency. At the same time, the extending direction of the fins 340 is consistent with the airflow direction, which is beneficial to achieving heat exchange consistency. Of course, in other embodiments of this application, the first heat dissipation assembly 30 may not include the second heat dissipation element 34; or, the structure of the second heat dissipation element 34 is the same as the structure of the first heat dissipation element 32.

[0156] like Figures 18-23As shown, in some embodiments, the housing 10 includes a first housing 18 and a second housing 19, which are fastened together. A first heat dissipation component 30 is disposed on the first housing 18, and the first heat dissipation component 30 and the first housing 18 are integral parts. It can be seen that the first heat dissipation component 30 is located on the first housing 18, and the first heat dissipation component 30 and the housing 10 are integral parts. This integrated design allows the processing of the heat dissipation component and the housing 10 to be completed in one molding process, thereby significantly improving production efficiency. At the same time, the integrated design reduces quality problems caused by improper assembly or loose connectors, improving the overall quality and reliability of the projection optical engine 2. The first housing 18 and the second housing 19 are fastened together, allowing for easy disassembly of both housings. When the projection optical engine 2 malfunctions or requires maintenance, the housing 10 can be quickly disassembled to check the condition of the internal components and perform necessary repairs or replacements, simplifying the maintenance process of the projection optical engine 2 and reducing maintenance difficulty.

[0157] The inventors performed corresponding simulations of the embodiments of this application and the prior art, and the simulation structures are shown in Table 1 and... Figures 24-27 As shown in the embodiment of this application, the plurality of heat dissipation pillars 320 in the first heat sink 32 are partially staggered in the second direction, and the arrangement density of the plurality of heat dissipation pillars 320 is different in different areas. In contrast, in the prior art, the first heat sink includes a plurality of spaced straight fins, and all other test conditions are the same. From Table 1 and Figures 24-27 It can be seen that the embodiment of this application improves the turbulence effect of airflow through the first heat sink 32 compared with the prior art, thereby increasing the airflow resistance inside the housing 10 and increasing the heat exchange between the airflow and the first heat sink 32, thus improving the problem of excessive temperature of the optical component 20.

[0158] Table 1 shows the simulation results of velocity and temperature distributions in the embodiments of this application and in the prior art.

[0159]

[0160] The projection device according to a second aspect of the present invention includes a projection optical engine 2 according to a first aspect of the present invention.

[0161] According to the projection device of the present invention, by employing the above-described projection optical engine 2, the stability of the projection device operation is improved.

[0162] Furthermore, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately. In addition, various different embodiments of this application can also be arbitrarily combined, as long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

[0163] In the description of this invention, it should be understood that the terms "center," "lateral," "length," "thickness," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0164] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on the upper side" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "on the lower side" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0165] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A projection optical engine, characterized in that, include: case; An optical component is disposed on the housing and defines an internal circulation channel with the surface of the housing; A first heat dissipation assembly is disposed on the housing and includes a first heat dissipation element disposed on the inner surface of the housing corresponding to the inner circulation channel. The first heat dissipation element includes a plurality of spaced heat dissipation columns, each of which extends inward from the inner surface of the housing. An internal circulation fan is provided inside the internal circulation channel and is used to drive the airflow within the internal circulation channel. The airflow within the internal circulation channel flows through the optical component and the first heat dissipation component.

2. The projection optical engine according to claim 1, characterized in that, The first heat sink is configured to satisfy at least one of the following conditions: Condition A1: The axial directions of the plurality of heat dissipation columns are arranged in parallel, and the angle between the axial direction of each heat dissipation column and the inner surface of the housing corresponding to the location of the heat dissipation column is α, where 40°≤α≤90°; Condition A2: The axial length of the heat dissipation column is H, 4mm≤H≤12mm; Condition A3, the cross-sectional area of the heat dissipation column is S, 1.5mm 2 ≤ S ≤ 3mm 2 ; Condition A4: The cross-sectional shape of the heat dissipation column is circular or polygonal.

3. The projection optical engine according to claim 1, characterized in that, The internal circulation channel includes a first flow channel section, a second flow channel section, a third flow channel section, a first transition section, and a second transition section. The internal circulation fan is located between the first flow channel section and the second flow channel section. The first flow channel section is located on one side of the axial direction of the internal circulation fan and is opposite to the internal circulation fan along the axial direction. The outlet of the first flow channel section is connected to the air inlet of the internal circulation fan. The inlet of the first flow channel section is connected to the outlet of the third flow channel section through the first transition section. The second flow channel section and the third flow channel section are both located on the other side of the axial direction of the internal circulation fan. The second flow channel section, the third flow channel section, and the first transition section are located on the same side of the internal circulation fan in a first direction. The second flow channel section and the third flow channel section are stacked at intervals along the first direction. The inlet of the second flow channel section is connected to the air outlet of the internal circulation fan. The outlet of the second flow channel section is connected to the inlet of the third flow channel section through the second transition section. The first direction is perpendicular to the axial direction of the internal circulation fan.

4. The projection optical engine according to claim 3, characterized in that, The housing includes a first housing portion, a second housing portion, and a third housing portion connected in sequence. The first housing portion corresponds to the first transition section. The second housing portion and the third housing portion correspond to the first flow channel section and are arranged opposite to the internal circulation fan along the axial direction of the internal circulation fan. The third housing portion is located on the side of the central axis of the internal circulation fan away from the first housing portion in the first direction. At least one of the first housing portion, the second housing portion, and the third housing portion has a plurality of spaced heat dissipation columns on its inner surface.

5. The projection optical engine according to claim 4, characterized in that, The heat dissipation pillars provided on the inner surface of the first shell portion are first heat dissipation pillars, the heat dissipation pillars provided on the inner surface of the second shell portion are second heat dissipation pillars, and the heat dissipation pillars provided on the inner surface of the third shell portion are third heat dissipation pillars. The arrangement density of the plurality of first heat dissipation columns in the first shell and the arrangement density of the plurality of third heat dissipation columns in the third shell are both less than the arrangement density of the plurality of second heat dissipation columns in the second shell.

6. The projection optical engine according to claim 5, characterized in that, Multiple first heat dissipation columns spaced apart along a second direction constitute a first heat dissipation radiator, and the first heat dissipation radiator is arranged in multiple rows spaced apart along the first direction. Multiple second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation radiator, and the second heat dissipation radiator is arranged in multiple rows spaced apart along the first direction. Multiple third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation radiator, and the third heat dissipation radiator is arranged in multiple rows spaced apart along the first direction. The first direction and the axis of the internal circulation fan are respectively perpendicular to the second direction. The distance between two adjacent first heat dissipation columns in the first heat dissipation radiator is h1, and the distance between two adjacent rows of first heat dissipation radiators is v1. The distance between two adjacent second heat dissipation columns in the second heat dissipation radiator is h2, and the distance between two adjacent rows of second heat dissipation radiators is v2. The distance between two adjacent third heat dissipation columns in the third heat dissipation radiator is h3, and the distance between two adjacent rows of third heat dissipation radiators is v3. h1 and h3 are both greater than or equal to h2, and v1 and v3 are both greater than or equal to v2.

7. The projection optical engine according to claim 6, characterized in that, 0.76≤h1 / v1≤0.82, 2.08≤h2 / v2≤2.35, 0.8≤h3 / v3≤0.9; and / or, 4.5mm≤h1≤5mm, 5.5mm≤v1≤7.5mm, 7.5mm≤h2≤8.5mm, 2.25mm≤v2≤2.75mm, 4.5mm≤h3≤5mm, 5mm≤v3≤6mm.

8. The projection optical engine according to claim 4, characterized in that, The heat dissipation column provided on the inner surface of the second shell is a second heat dissipation column. The second shell has a first arrangement area and a second arrangement area. The first arrangement area and the second arrangement area are respectively provided with a plurality of second heat dissipation columns. At least a portion of the first arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan. The second arrangement area is located on the outer periphery of the first arrangement area and is offset from the air inlet of the internal circulation fan. The arrangement density of the plurality of second heat dissipation columns in the first arrangement area is greater than the arrangement density of the plurality of second heat dissipation columns in the second arrangement area; and / or, The area of ​​the first arrangement area is A1, the area of ​​the second arrangement area is A2, and A1 / (A1+A2)≥1 / 5.

9. The projection optical engine according to claim 8, characterized in that, For the first arrangement area and the second arrangement area, a plurality of second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation row. The second heat dissipation row consists of multiple rows spaced apart along the first direction. The distance between two adjacent second heat dissipation columns of the second heat dissipation row in the first arrangement area is h21, and the distance between two adjacent second heat dissipation columns of the second heat dissipation row in the second arrangement area is h22. 0.8≤h21 / h22≤0.

83. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively.

10. The projection optical engine according to claim 4, characterized in that, The heat dissipation column provided on the inner surface of the third shell is a third heat dissipation column. The third shell has a third arrangement area and a fourth arrangement area. The third arrangement area and the fourth arrangement area are respectively provided with a plurality of third heat dissipation columns. At least a portion of the third arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan. The fourth arrangement area is located on the outer periphery of the third arrangement area and is offset from the air inlet of the internal circulation fan. The arrangement density of the plurality of third heat dissipation columns in the third arrangement area is greater than the arrangement density of the plurality of third heat dissipation columns in the fourth arrangement area; and / or, The area of ​​the third arrangement area is A3, the area of ​​the fourth arrangement area is A4, and A3 / (A3+A4)≥1 / 6.

11. The projection optical engine according to claim 10, characterized in that, For the third arrangement area and the fourth arrangement area, multiple third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation duct. The third heat dissipation duct is multiple rows spaced apart along the first direction. The distance between two adjacent third heat dissipation columns of the third heat dissipation duct in the third arrangement area is h31, and the distance between two adjacent third heat dissipation columns of the third heat dissipation duct in the fourth arrangement area is h32. 0.78≤h31 / h32≤0.

81. The first direction and the axis of the internal circulation fan are perpendicular to the second direction, respectively.

12. The projection optical engine according to claim 4, characterized in that, The heat dissipation columns disposed on the inner surface of the first shell portion are first heat dissipation columns, the heat dissipation columns disposed on the inner surface of the second shell portion are second heat dissipation columns, and the heat dissipation columns disposed on the inner surface of the third shell portion are third heat dissipation columns. Multiple first heat dissipation columns spaced apart along a second direction constitute a first heat dissipation array. The first heat dissipation array consists of multiple rows spaced apart along the first direction. Multiple second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation array. The second heat dissipation array consists of multiple rows spaced apart along the first direction. Multiple third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation array. The third heat dissipation array consists of multiple rows spaced apart along the first direction. The first direction and the axial direction of the internal circulation fan are perpendicular to the second direction, respectively. The first heat sink is configured to satisfy at least one of the following conditions: Condition B1: The first heat dissipation columns of two adjacent rows of the first heat dissipation radiators are staggered in the second direction; Condition B2: The second heat dissipation columns of two adjacent rows of the second heat dissipation radiators are staggered in the second direction; Condition B3: At least a portion of the third heat dissipation columns in two adjacent rows of the third heat dissipation vents are staggered in the second direction.

13. The projection optical engine according to claim 12, characterized in that, The first heat sink is configured to satisfy at least one of the following conditions: Condition C1: The first heat sink meets condition B1, and the misalignment distance between two adjacent rows of the first heat sink is 0.4 to 0.6 times the distance between two adjacent first heat sink columns of the first heat sink. Condition C2: The first heat sink meets condition B2, and the misalignment distance between two adjacent rows of second heat sinks is 0.4 to 0.6 times the distance between two adjacent second heat sink columns of the second heat sink. Condition C3: The first heat sink meets condition B3, and the misalignment distance between two adjacent rows of the third heat sink is 0.6 to 0.7 times the distance between two adjacent third heat sink columns of the third heat sink.

14. The projection optical engine according to claim 12, characterized in that, The first heat sink satisfies condition B2, and the second heat sink has three or more rows. In the first direction, along the direction from the first shell to the second shell, the nth row of the second heat sink is adjacent to the (n+1)th row of the second heat sink relative to the (n-1)th row of the second heat sink, where n is a positive even number.

15. The projection optical engine according to claim 14, characterized in that, The distance between the second heat sink in the nth row and the second heat sink in the (n-1)th row is v21, and the distance between the second heat sink in the (n-1)th row and the second heat sink in the (n+1)th row is v22, where 0.7 ≤ v21 / v22 ≤ 0.

74.

16. The projection optical engine according to claim 12, characterized in that, The first heat sink meets condition B3. The third shell has a third arrangement area and a fourth arrangement area. The third arrangement area and the fourth arrangement area are respectively provided with a plurality of third heat sink columns. At least a portion of the third arrangement area is opposite to the air inlet of the internal circulation fan along the axial direction of the internal circulation fan. The fourth arrangement area is located on the outer periphery of the third arrangement area and is offset from the air inlet of the internal circulation fan. In the third arrangement area, the third heat dissipation columns of two adjacent rows of the third heat dissipation radiators are staggered in the second direction, and in the fourth arrangement area, the third heat dissipation columns of two adjacent rows of the third heat dissipation radiators are arranged opposite to each other along the first direction.

17. The projection optical engine according to claim 4, characterized in that, The heat dissipation columns disposed on the inner surface of the first shell portion are first heat dissipation columns, the heat dissipation columns disposed on the inner surface of the second shell portion are second heat dissipation columns, and the heat dissipation columns disposed on the inner surface of the third shell portion are third heat dissipation columns. Multiple first heat dissipation columns spaced apart along a second direction constitute a first heat dissipation array. The first heat dissipation array consists of multiple rows spaced apart along the first direction. Multiple second heat dissipation columns spaced apart along the second direction constitute a second heat dissipation array. The second heat dissipation array consists of multiple rows spaced apart along the first direction. Multiple third heat dissipation columns spaced apart along the second direction constitute a third heat dissipation array. The third heat dissipation array consists of multiple rows spaced apart along the first direction. The first direction and the axial direction of the internal circulation fan are perpendicular to the second direction, respectively. The distance between adjacent first and second heat sinks is M, and the distance between two adjacent rows of first heat sinks is v1, where 0.8 ≤ M / v1 ≤ 0.9; and / or, The distance between adjacent second and third heat sinks is N, and the distance between two adjacent rows of third heat sinks is v3, where 0.9 ≤ N / v3 ≤ 1.

18. The projection optical engine according to claim 4, characterized in that, The inner surface of the first shell is an arc surface, the inner surface of the second shell is a plane parallel to the first direction and smoothly transitions to the inner surface of the first shell, the inner surface of the third shell extends obliquely in the first direction away from the second shell toward the direction closer to the internal circulation fan, and the axial direction of all the heat dissipation columns is perpendicular to the inner surface of the second shell.

19. The projection optical engine according to claim 18, characterized in that, The plurality of heat dissipation columns include a first heat dissipation column, a second heat dissipation column, and a third heat dissipation column. The height of the first heat dissipation column is H1, the height of the second heat dissipation column is H2, and the height of the third heat dissipation column is H3. The values ​​are: 10mm≤H1≤12mm, 9.5mm≤H2≤10.5mm, and 4mm≤H3≤9mm.

20. The projection optical engine according to claim 3, characterized in that, The internal circulation fan is a centrifugal fan.

21. The projection optical engine according to claim 3, characterized in that, The dimension L1 occupied by the second flow channel section in the first direction and the dimension L2 of the internal circulation fan in the first direction satisfy 0.2≤L1 / L2≤0.

3.

22. The projection optical engine according to claim 3, characterized in that, The second flow channel segment includes two parallel and interconnected first branches. The optical components include an LCD screen, a front Fresnel lens, a heat-insulating glass, and a rear Fresnel lens. The front Fresnel lens, the LCD screen, the heat-insulating glass, and the rear Fresnel lens are spaced apart along a first direction, so that the third flow channel segment is defined between the front Fresnel lens and the LCD screen, the first branch is defined between the LCD screen and the heat-insulating glass, and the first branch is defined between the heat-insulating glass and the rear Fresnel lens.

23. The projection optical engine according to claim 3, characterized in that, It includes a lens, an LED light source, and a light funnel. The lens and the LED light source are arranged correspondingly along the optical path. The optical component is located between the lens and the LED light source. The light funnel is located between the optical component and the LED light source, with the larger end of the light funnel facing the optical component and the smaller end facing the LED light source.

24. The projection optical engine according to claim 23, characterized in that, Also includes: The second heat dissipation component is disposed outside the housing and located on the side of the light funnel away from the internal circulation fan, and is used for heat exchange with the LED light source. An external circulation fan is provided between the light funnel and the second heat dissipation component and is used to drive airflow through the second heat dissipation component.

25. The projection optical engine according to claim 1, characterized in that, The first heat dissipation component further includes a second heat dissipation element disposed on the outer surface of the housing. The second heat dissipation element is disposed opposite to the first heat dissipation element, and the second heat dissipation element includes a plurality of spaced fins. The extension direction of each fin is consistent with the direction of airflow in the inner circulation channel through the first heat dissipation element.

26. The projection optical engine according to any one of claims 1-25, characterized in that, The housing includes a first housing and a second housing, which are fastened together. The first heat dissipation component is disposed on the first housing and is an integral part of the first housing.

27. A projection device, characterized in that, The projection optical engine includes any one of claims 1-26.

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