Projection light machine and projection device

Abstract

The present application relates to a kind of projection light machine and projection equipment.Projection light machine includes shell, optical assembly, heat exchange device and fan.First lens, second lens and shell form first closed chamber, first closed chamber includes air-cooled chamber, first heat exchange chamber and second heat exchange chamber, first heat exchange chamber and second heat exchange chamber are located at the two sides of light collector respectively, air-cooled chamber is arranged between first heat exchange chamber and second heat exchange chamber, and is communicated with first heat exchange chamber and second heat exchange chamber respectively, liquid crystal light valve is arranged in air-cooled chamber.Heat exchange device is arranged on the cavity wall of first heat exchange chamber and / or second heat exchange chamber, part of heat exchange device is located in first heat exchange chamber and / or second heat exchange chamber, fan is arranged in first heat exchange chamber or second heat exchange chamber, can improve heat dissipation efficiency.In addition, light collector is arranged in the space surrounded by first heat exchange chamber, air-cooled chamber and second heat exchange chamber, make full use of space, it is advantageous to reduce the volume of projection light machine.

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 consists of a light source, a light-collecting element, a front Fresnel lens, a liquid crystal light valve, a rear Fresnel lens, and a projection lens. During projection, the light source emits light, which passes through the rear Fresnel lens to illuminate the liquid crystal light valve. The front Fresnel lens then converges the emitted light onto the projection lens, ultimately projecting the content displayed by the liquid crystal light valve onto the screen.

[0003] Because the transmittance of the liquid crystal light valve is low, most of the light is concentrated on the light valve and absorbed, manifesting as heat, resulting in a very high temperature for the light valve. To solve the heat dissipation problem, heat exchange devices are installed inside the projector optical engine; however, common projector optical engines have low heat dissipation efficiency and large size. Summary of the Invention

[0004] Therefore, it is necessary to provide a projection optical engine and projection device that can improve heat dissipation efficiency and reduce size.

[0005] A projection optical engine, comprising:

[0006] chassis;

[0007] An optical assembly includes a light source and a focusing element, a first lens, a liquid crystal light valve, and a second lens arranged sequentially along the propagation path of the light emitted from the light source. The first lens, the second lens, and the housing enclose a first enclosed chamber. The first enclosed chamber includes an air-cooled chamber, a first heat exchange chamber, and a second heat exchange chamber. The first heat exchange chamber and the second heat exchange chamber are located on opposite sides of the focusing element. The air-cooled chamber is located between the first heat exchange chamber and the second heat exchange chamber and communicates with both the first heat exchange chamber and the second heat exchange chamber. The liquid crystal light valve is located inside the air-cooled chamber.

[0008] A heat exchange device, wherein the heat exchange device is disposed on the cavity wall of the first heat exchange chamber and / or the second heat exchange chamber, and a portion of the heat exchange device is located within the first heat exchange chamber and / or the second heat exchange chamber;

[0009] A fan is disposed in the first heat exchange chamber or the second heat exchange chamber. The fan is used to drive the heat dissipation airflow in the first heat exchange chamber, the air-cooled chamber and the second heat exchange chamber to circulate and flow through the liquid crystal light valve and the heat exchange device.

[0010] In one embodiment, a first air duct is formed between the first lens and the liquid crystal light valve, and a second air duct is formed between the liquid crystal light valve and the second lens. One end of the first air duct is connected to one end of the second air duct through the first heat exchange chamber, and the other end of the second air duct is connected to the other end of the first air duct through the second heat exchange chamber. The fan is disposed in the second heat exchange chamber and has an air inlet and an air outlet. The air outlet is connected to the first air duct, and the air inlet is connected to the second air duct.

[0011] In one embodiment, the heat exchange device includes a first heat exchanger, which includes a first heat dissipation section and a first heat exchange section. The first heat exchange section is disposed inside the first heat exchange chamber, and the first heat dissipation section is disposed outside the first heat exchange chamber.

[0012] In one embodiment, the projection optical engine further includes a first partition, one end of which is sealed to the side of the liquid crystal light valve near the first heat exchange chamber, and the other end extends into the first heat exchange chamber and has a first gap between it and the cavity wall of the first heat exchange chamber away from the liquid crystal light valve, so as to divide the first heat exchange chamber into a third air duct near the light focusing element and a fourth air duct away from the light focusing element. One end of the third air duct is connected to the fourth air duct through the first gap, the other end of the third air duct is connected to the first air duct, and the other end of the fourth air duct is connected to the second air duct.

[0013] In one embodiment, the first heat exchange section is disposed in the fourth air duct, and the first heat exchange section extends from one end of the fourth air duct near the air-cooled chamber to the other end of the fourth air duct away from the air-cooled chamber.

[0014] In one embodiment, the end of the first heat exchange section away from the air-cooled chamber passes through the first interval and extends into the third air duct; the height of the first interval is less than half the height of the first heat exchange chamber.

[0015] In one embodiment, the projection optical engine further includes a second partition, one end of which is sealed to the side of the liquid crystal light valve near the second heat exchange chamber, and the other end extends into the second heat exchange chamber and has a second gap between it and the cavity wall of the second heat exchange chamber away from the liquid crystal light valve, so as to divide the second heat exchange chamber into a fifth air duct away from the focusing element and a sixth air duct near the focusing element. The air outlet is located at the end of the fan near the air-cooled chamber, and the two sides of the fan at the end with the air outlet respectively abut against the second partition and the housing. The air outlet is connected to the first air duct through the sixth air duct. The air inlet is located on the side of the fan away from and / or facing the focusing element, and the air inlet is connected to the second air duct through the second gap and the fifth air duct.

[0016] In one embodiment, the heat exchange device further includes a second heat exchanger, which includes a second heat dissipation section and a second heat exchange section. The second heat exchange section is disposed inside the second heat exchange chamber, and the second heat dissipation section is disposed outside the second heat exchange chamber.

[0017] In one embodiment, the second heat exchange section is disposed in the fifth air duct, and the second heat exchange section extends from one end of the fifth air duct near the air-cooled chamber to the other end of the fifth air duct away from the air-cooled chamber.

[0018] In one embodiment, the optical component further includes a heat-insulating optical plate disposed within the air-cooled cavity; the heat-insulating optical plate is disposed between the first lens and the liquid crystal light valve, and the heat-insulating optical plate and the first lens are sealed together, forming a first air duct between the heat-insulating optical plate and the liquid crystal light valve; or, the heat-insulating optical plate divides the first air duct into a first branch air duct and a second branch air duct in parallel, wherein the first lens and the heat-insulating optical plate form a first branch air duct, and the heat-insulating optical plate and the liquid crystal light valve form a second branch air duct; or, the heat-insulating optical plate is disposed on the side of the first lens away from the liquid crystal light valve, and the heat-insulating optical plate and the first lens are sealed together.

[0019] In one embodiment, the light-concentrating element is a light cone, which has an incident light end and an exit light end. The cross-sectional area of ​​the light cone gradually increases along the direction from the incident light end to the exit light end. The light source is located at the incident light end, and the first lens is located at the exit light end.

[0020] In one embodiment, the projection optical engine further includes a bracket connected to the housing, the bracket having a receiving cavity adapted to the light cone, the light cone being disposed within the receiving cavity, and the side wall of the bracket having heat dissipation holes communicating with the receiving cavity.

[0021] In one embodiment, the second lens and the housing further enclose a second sealed chamber located on the side of the air-cooled chamber away from the light-concentrating element; the optical assembly also includes a projection lens and a reflector, the reflector and at least a portion of the projection lens being disposed within the second sealed chamber, the reflector being used to reflect light emitted from the second lens to the projection lens.

[0022] A projection device, including the aforementioned projection optical engine.

[0023] In the aforementioned projection optical engine and projection equipment, during projection, the light emitted from the light source is focused by a focusing element and then passes sequentially through a first lens, a liquid crystal light valve, and a second lens, finally projecting the content displayed by the liquid crystal light valve onto the screen. During projection, when light that cannot pass through the liquid crystal light valve is converted into heat, a fan operates, causing the cooling airflow in the first heat exchange chamber, the air-cooled chamber, and the second heat exchange chamber to circulate. This cooling airflow flows through the liquid crystal light valve to remove its heat. Then, the cooling airflow passes through a heat exchange device located in the first and / or second heat exchange chambers. The heat exchange device absorbs the heat from the cooling airflow and conducts it to the outside of the first and second heat exchange chambers for cooling. After heat exchange, the cooling airflow, under the action of the fan, flows through the liquid crystal light valve, thus circulating and cooling the liquid crystal light valve, ensuring it operates at a suitable temperature, preventing damage due to temperature, and extending the lifespan of the projection optical engine. Since the first enclosed chamber includes a first heat exchange chamber, an air-cooled chamber, and a second heat exchange chamber, with the air-cooled chamber located between and communicating with both chambers, and the heat exchange device situated on the walls of the first and / or second heat exchange chambers (partially located within each chamber), this increases the heat dissipation area and improves heat dissipation efficiency. Furthermore, the first and second heat exchange chambers are located on opposite sides of the focusing element, meaning the focusing element is situated within the space enclosed by the first, air-cooled, and second heat exchange chambers. This maximizes space utilization and helps reduce the size of the projection engine. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a projection optical engine according to an embodiment of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the structure of a projection optical engine according to an embodiment of the present invention. Figure 2 ;

[0028] Figure 3 This is a schematic diagram of the structure of a projection optical engine according to an embodiment of the present invention. Figure 3 ;

[0029] Figure 4 This is a schematic diagram of the structure of a projection optical engine according to an embodiment of the present invention. Figure 4 ;

[0030] Figure 5 This is a schematic diagram of the structure of a projection optical engine according to an embodiment of the present invention. Figure 5 ;

[0031] Figure 6 for Figure 1 The diagram shows the structural design of the projection engine's support frame.

[0032] Figure 7 for Figure 1 The schematic diagram of the first or second heat exchanger of the projection optical engine shown. Figure 1 ;

[0033] Figure 8 for Figure 1 The schematic diagram of the first or second heat exchanger of the projection optical engine shown. Figure 2 .

[0034] Reference numerals: 10. Housing; 11. First enclosed chamber; 111. First heat exchange chamber; 1111. Third air duct; 1112. Fourth air duct; 1113. First partition; 112. Second heat exchange chamber; 1121. Fifth air duct; 1122. Sixth air duct; 1123. Second partition; 113. Air-cooled chamber; 1131. First air duct; 1132. Second air duct; 1133. First branch air duct; 1134. Second branch air duct; 12. Second enclosed chamber; 13. Mounting slot; 20. Optical components; 21. 22. Light source; 23. Concentrating element; 24. First lens; 25. Liquid crystal light valve; 26. Second lens; 27. Heat-insulating optical plate; 28. Reflector; 39. Projection lens; 30. Heat exchange device; 31. First heat exchanger; 311. First heat dissipation part; 312. First heat exchange part; 32. Second heat exchanger; 321. Second heat dissipation part; 322. Second heat exchange part; 33. Heat dissipation structure; 34. Heat dissipation fins; 40. Fan; 50. First partition; 60. Second partition; 70. Support; 71. Receiving cavity; 72. Heat dissipation hole. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Please see Figure 1 , Figure 2 and Figure 5 An embodiment of the projection optical engine of the present invention includes a housing 10, an optical assembly 20, a heat exchange device 30, and a fan 40. The optical assembly 20 includes a light source 21 and a focusing element 22, a first lens 23, a liquid crystal light valve 24, and a second lens 25 arranged sequentially along the propagation path of the light emitted from the light source 21. The first lens 23, the second lens 25, and the housing 10 enclose a first closed chamber 11. The first closed chamber 11 includes an air-cooled chamber 113, a first heat exchange chamber 111, and a second heat exchange chamber 112. The first heat exchange chamber 111 and the second heat exchange chamber 112 are located on opposite sides of the focusing element 22. The air-cooled chamber 113 is disposed between the first heat exchange chamber 111 and the second heat exchange chamber 112 and is connected to both the first heat exchange chamber 111 and the second heat exchange chamber 112. The liquid crystal light valve 24 is disposed within the air-cooled chamber 113. The heat exchange device 30 is disposed on the cavity wall of the first heat exchange chamber 111 and / or the second heat exchange chamber 112, and a portion of the heat exchange device 30 is located within the first heat exchange chamber 111 and / or the second heat exchange chamber 112. The fan 40 is disposed within the first heat exchange chamber 111 or the second heat exchange chamber 112, and the fan 40 is used to drive the heat dissipation airflow in the first heat exchange chamber 111, the air-cooled chamber 113, and the second heat exchange chamber 112 to circulate, and flow through the liquid crystal light valve 24 and the heat exchange device 30.

[0037] In the aforementioned projection optical engine, during projection, the light emitted from the light source 21 is focused by the focusing element 22 and then passes sequentially through the first lens 23, the liquid crystal light valve 24, and the second lens 25, finally projecting the content displayed by the liquid crystal light valve 24 onto the screen. During projection, when light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the cooling airflow in the first heat exchange chamber 111, the air-cooled chamber 113, and the second heat exchange chamber 112 to circulate. The cooling airflow flows through the liquid crystal light valve 24 to remove the heat from it. Then, the cooling airflow passes through the heat exchange device 30 located in the first heat exchange chamber 111 and / or the second heat exchange chamber 112. The heat exchange device 30 absorbs the heat from the cooling airflow and conducts the heat to the outside of the first heat exchange chamber 111 and the second heat exchange chamber 112 for cooling. After heat exchange, the cooling airflow flows through the liquid crystal light valve 24 under the action of the fan 40. This cycle repeats, cooling the liquid crystal light valve 24 and ensuring it operates at a suitable temperature, preventing damage due to temperature and extending the lifespan of the projection engine. Since the first enclosed chamber 11 includes a first heat exchange chamber 111, an air-cooled chamber 113, and a second heat exchange chamber 112, with the air-cooled chamber 113 located between and communicating with both chambers, and the heat exchange device 30 located on the walls of the first and / or second heat exchange chambers 111 and 112 (partially within each chamber), this increases the heat dissipation area and improves heat dissipation efficiency. In addition, the first heat exchange chamber 111 and the second heat exchange chamber 112 are respectively located on opposite sides of the focusing element 22, that is, the focusing element 22 is located in the space enclosed by the first heat exchange chamber 111, the air-cooled chamber 113 and the second heat exchange chamber 112. This can make full use of the space and help reduce the size of the projection optical engine.

[0038] In one embodiment, see Figure 1A first air duct 1131 is formed between the first lens 23 and the liquid crystal light valve 24, and a second air duct 1132 is formed between the liquid crystal light valve 24 and the second lens 25. One end of the first air duct 1131 is connected to one end of the second air duct 1132 through the first heat exchange chamber 111, and the other end of the second air duct 1132 is connected to the other end of the first air duct 1131 through the second heat exchange chamber 112. A fan 40 is located in the second heat exchange chamber 112 and has an air inlet and an air outlet. The air outlet is connected to the first air duct 1131, and the air inlet is connected to the second air duct 1132. During projection, when light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the cooling airflow in the first closed chamber 11 to flow. The cooling airflow flows through the first air duct 1131, carrying away the heat from the side of the liquid crystal light valve 24 facing the first lens 23, and then flows through the first heat exchange chamber 111. If the first heat exchange chamber 111 is equipped with a heat exchange device 30, the heat exchange device 30 in the first heat exchange chamber 111 absorbs the heat from the cooling airflow and conducts the heat to the outside of the first heat exchange chamber 111 for cooling. The cooled airflow then flows through the second air duct 1132. If the first heat exchange chamber 111 is not equipped with a heat exchange device 30, the cooled airflow flows directly into the second air duct 1132 through the first heat exchange chamber 111. The cooled airflow flowing through the second air duct 1132 carries away the heat from the side of the liquid crystal light valve 24 facing the second lens 25, and then the cooled airflow flows into the second heat exchange chamber 112. If the second heat exchange chamber 112 is equipped with a heat exchange device 30, the heat exchange device 30 located in the second heat exchange chamber 112 absorbs the heat of the heat dissipation airflow and conducts the heat to the outside of the second heat exchange chamber 112 for cooling. The heat dissipation airflow after heat exchange flows into the air inlet of the fan 40. If the second heat exchange chamber 112 is not equipped with a heat exchange device 30, the heat dissipation airflow flows directly into the air inlet of the fan 40 through the second heat exchange chamber 112.

[0039] Optionally, see Figure 1The first heat exchange chamber 111 and the second heat exchange chamber 112 are each equipped with a heat exchange device 30. The heat dissipation airflow discharged from the air outlet of the fan 40 flows through the first air duct 1131, carrying away the heat on the side of the liquid crystal light valve 24 facing the first lens 23. Then the heat dissipation airflow flows into the first heat exchange chamber 111. The heat exchange device 30 in the first heat exchange chamber 111 absorbs the heat of the heat dissipation airflow and conducts the heat to the outside of the first heat exchange chamber 111. After heat exchange, the heat dissipation airflow flows through the second air duct 1132. The heat dissipation airflow flowing through the second air duct 1132 carries away the heat on the side of the liquid crystal light valve 24 facing the second lens 25. Then the heat dissipation airflow flows into the second heat exchange chamber 112. The heat exchange device 30 in the second heat exchange chamber 112 absorbs the heat of the heat dissipation airflow and conducts the heat to the outside of the second heat exchange chamber 112, and then flows into the air inlet of the fan 40. Thus, before the cooling airflow enters the first air duct 1131 and the second air duct 1132, it has already exchanged heat with the heat exchange device 30 in the first heat exchange chamber 111 and the second heat exchange chamber 112. When the cooling airflow passes through the first air duct 1131 and the second air duct 113 respectively, it can carry away more heat from the liquid crystal light valve 24, which is beneficial to improving the heat dissipation efficiency.

[0040] In this embodiment, the fan 40 is a vortex fan, which has two air inlets and one air outlet. The two air inlets are arranged opposite to each other, with one air inlet facing the side of the second heat exchange chamber 112 closer to the concentrator 22, and the other air inlet facing the side of the second heat exchange chamber 112 away from the concentrator 22. The air outlet faces the first air duct 1131.

[0041] Further, see Figure 1 and Figure 3 The optical assembly 20 also includes a heat-insulating optical plate 26 disposed within the air-cooled chamber 113. The heat-insulating optical plate 26 is located between the first lens 23 and the liquid crystal light valve 24; alternatively, the heat-insulating optical plate 26 is located on the side of the first lens 23 away from the liquid crystal light valve 24. Optionally, the heat-insulating optical plate 26 is heat-insulating glass, which is either heat-reflective or heat-absorbing. During projection, the heat-insulating optical plate 26 effectively blocks the heat generated by the light source 21 from being conducted to the liquid crystal light valve 24, preventing the heat from affecting other components in the optical assembly 20. Furthermore, it also helps to improve light utilization.

[0042] Optionally, see Figure 1 and Figure 3 During the projection process, if the temperature of the first lens 23 is not high, the two sides of the heat-insulating optical plate 26 can be sealed and fitted to the two sides of the first lens 23 respectively.

[0043] Optionally, see Figure 2During projection, if the temperature of the first lens 23 becomes too high, a heat-insulating optical plate 26 is positioned between the first lens 23 and the liquid crystal light valve 24, dividing the first air duct 1131 into a first branch air duct 1133 and a second branch air duct 1134 in parallel. The first branch air duct 1133 is formed between the first lens 23 and the heat-insulating optical plate 26, and the second branch air duct 1134 is formed between the heat-insulating optical plate 26 and the liquid crystal light valve 24. Thus, under the action of the fan 40, the cooling airflow flows into the first branch air duct 1133 and the second branch air duct 1134 respectively, reducing the temperature of the first lens 23 and the heat-insulating optical plate 26.

[0044] In one embodiment, see Figure 1 The heat exchange device 30 includes a first heat exchanger 31. The first heat exchanger 31 includes a first heat dissipation part 311 and a first heat exchange part 312. The first heat exchange part 312 is disposed inside the first heat exchange chamber 111, and the first heat dissipation part 311 is disposed outside the first heat exchange chamber 111. During the projection process, when the light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the heat dissipation airflow in the first closed chamber 11 to flow. The heat dissipation airflow flows through the first air duct 1131 in sequence, carrying away the heat on the side of the liquid crystal light valve 24 facing the first lens 23. Then the heat dissipation airflow flows through the first heat exchange chamber 111. The first heat exchange part 312 absorbs the heat of the heat dissipation airflow and conducts the heat to the first heat dissipation part 311 for cooling. After heat exchange, the heat dissipation airflow flows through the second air duct 1132. The heat dissipation airflow flowing through the second air duct 1132 carries away the heat on the side of the liquid crystal light valve 24 facing the second lens 25. Then the heat dissipation airflow flows into the second heat exchange chamber 112 and then into the air inlet of the fan 40.

[0045] Further, see Figure 1 , Figure 4 and Figure 5The projection optical engine also includes a first partition 50. One end of the first partition 50 is sealed to the side of the liquid crystal light valve 24 near the first heat exchange chamber 111, and the other end extends into the first heat exchange chamber 111, having a first gap 1113 between it and the cavity wall of the first heat exchange chamber 111 away from the liquid crystal light valve 24, thereby dividing the first heat exchange chamber 111 into a third air duct 1111 near the light focusing element 22 and a fourth air duct 1112 away from the light focusing element 22. One end of the third air duct 1111 is connected to the fourth air duct 1112 through the first gap 1113, the other end of the third air duct 1111 is connected to the first air duct 1131, and the other end of the fourth air duct 1112 is connected to the second air duct 1132. During projection, when light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the cooling airflow within the first enclosed chamber 11 to circulate. The cooling airflow flows sequentially through the first air duct 1131, carrying away heat from the side of the liquid crystal light valve 24 facing the first lens 23. Then, the cooling airflow flows sequentially through the third air duct 1111 and the fourth air duct 1112. The first heat exchange unit 312 absorbs the heat from the cooling airflow and conducts it to the first heat dissipation unit 311 for cooling. After heat exchange, the cooling airflow flows through the second air duct 1132, carrying away heat from the side of the liquid crystal screen facing the second lens 25. Then, the cooling airflow flows through the second heat exchange chamber 112 and flows into the air inlet of the fan 40. Thus, by setting the first separator 50, the cooling airflow passes through the first heat exchanger 31 along the longest possible path, improving heat dissipation efficiency.

[0046] Further, see Figure 1 The first heat exchange section 312 is disposed within the fourth air duct 1112, extending from one end of the fourth air duct 1112 near the air-cooled chamber 113 to the other end of the fourth air duct 1112 away from the air-cooled chamber 113. In this way, the space of the fourth air duct 1112 is fully utilized, the area of ​​the first heat exchange section 312 is increased, and the heat dissipation efficiency is improved.

[0047] Optionally, see Figure 7 and Figure 8The first heat exchanger 31 is a heat exchange device 30 with needle-shaped or columnar heat dissipation structures manufactured by die casting. Both the first heat dissipation section 311 and the first heat exchange section 312 include multiple needle-shaped or columnar heat dissipation structures 33. Alternatively, the first heat exchanger 31 is a heat exchange device 30 with heat dissipation fins 34 manufactured by extrusion. Both the first heat dissipation section 311 and the first heat exchange section 312 include multiple spaced heat dissipation fins 34. The multiple heat dissipation fins 34 of the first heat exchange section 312 extend from the end of the fourth air duct 1112 near the air-cooled chamber 113 towards the end of the fourth air duct 1112 away from the air-cooled chamber 113, and an airflow channel is formed between two adjacent heat dissipation fins 34. The multiple heat dissipation fins 34 of the first heat dissipation section 311 are located outside the first heat exchange chamber 111, and their arrangement is the same as that of the heat dissipation fins 34 of the first heat exchange section 312.

[0048] Furthermore, the end of the first heat exchange section 312 furthest from the air-cooled chamber 113 passes through the first interval 1113 and extends into the third air duct 1111. The height of the first interval 1113 is less than half the height of the first heat exchange chamber 111. In other embodiments, the height of the first interval 1113 may be less than one-third or one-quarter of the height of the first heat exchange chamber 111. This allows the cooling airflow to pass through the first heat exchanger 31 along the longest possible path, improving heat dissipation efficiency.

[0049] In one embodiment, see Figure 1 and Figure 4The projection optical engine also includes a second partition 60. One end of the second partition 60 is sealed to the side of the liquid crystal light valve 24 near the second heat exchange chamber 112, and the other end extends into the second heat exchange chamber 112, having a second gap 1123 between it and the chamber wall of the second heat exchange chamber 112 away from the liquid crystal light valve 24, thereby dividing the second heat exchange chamber 112 into a fifth air duct 1121 away from the focusing element 22 and a sixth air duct 1122 near the focusing element 22. An air outlet is located at one end of the fan 40 near the air-cooled chamber 113. The two sides of the end of the fan 40 with the air outlet respectively abut against the second partition 60 and the housing 10. The air outlet is connected to the first air duct 1131 through the sixth air duct 1122. An air inlet is located on the side of the fan 40 away from and / or facing the focusing element 22. The air inlet is connected to the second air duct 1132 through the second gap 1123 and the fifth air duct 1121. During projection, when light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the cooling airflow within the first enclosed chamber 11 to flow. This cooling airflow sequentially flows through the first air duct 1131, carrying away the heat from the side of the liquid crystal light valve 24 facing the first lens 23. Then, the cooling airflow flows through the first heat exchange chamber 111 into the second air duct 1132, where it carries away the heat from the side of the liquid crystal light valve 24 facing the second lens 25. Finally, the cooling airflow flows through the fifth air duct 1121 and the second partition 1123 into the air inlet of the fan 40. Thus, by providing the second partition 60, the exhaust airflow and intake airflow of the fan 40 are separated.

[0050] Further, see Figure 1 The heat exchange device 30 also includes a second heat exchanger 32. The second heat exchanger 32 includes a second heat dissipation section 321 and a second heat exchange section 322. The second heat exchange section 322 is disposed inside the second heat exchange chamber 112, and the second heat dissipation section 321 is disposed outside the second heat exchange chamber 112. During the projection process, when the light that cannot pass through the liquid crystal light valve 24 is converted into heat, the fan 40 operates, causing the heat dissipation airflow in the first closed chamber 11 to flow. The heat dissipation airflow flows through the first air duct 1131 in sequence, carrying away the heat on the side of the liquid crystal light valve 24 facing the first lens 23. Then, the heat dissipation airflow flows through the first heat exchange chamber 111 into the second air duct 1132. The heat dissipation airflow flowing through the second air duct 1132 carries away the heat on the side of the liquid crystal light valve 24 facing the second lens 25. Then, the heat dissipation airflow flows into the second heat exchange chamber 112. The second heat exchange section 322 absorbs the heat of the heat dissipation airflow and conducts the heat to the second heat dissipation section 321 for cooling. The heat dissipation airflow after heat exchange flows into the air inlet of the fan 40.

[0051] Furthermore, see Figure 1The second heat exchange section 322 is disposed within the fifth air duct 1121, extending from one end of the fifth air duct 1121 near the air-cooled chamber 113 to the other end of the fifth air duct 1121 away from the air-cooled chamber 113. This fully utilizes the space of the fifth air duct 1121, increasing the area of ​​the heat exchange section of the second heat exchanger 32 and improving its heat exchange efficiency.

[0052] Optionally, see Figure 7 and Figure 8 The second heat exchanger 32 is a heat exchange device 30 with needle-shaped or columnar heat dissipation structures manufactured by die casting. Both the second heat dissipation section 321 and the second heat exchange section 322 include multiple needle-shaped or columnar heat dissipation structures 33. Alternatively, the second heat exchanger 32 is a heat exchange device 30 with heat dissipation fins 34 manufactured by extrusion. Both the second heat dissipation section 321 and the second heat exchange section 322 include multiple spaced heat dissipation fins 34. The multiple heat dissipation fins 34 of the second heat exchange section 322 extend from the end of the fifth air duct 1121 near the air-cooled chamber 113 to the end of the fifth air duct 1121 away from the air-cooled chamber 113, and an airflow channel is formed between two adjacent heat dissipation fins 34. The multiple heat dissipation fins 34 of the second heat dissipation section 321 are located outside the second heat exchange chamber 112, and their arrangement is the same as that of the heat dissipation fins 34 of the second heat exchange section 322.

[0053] In one embodiment, the light-concentrating element 22 is a light cone. The light cone has an incident end and an exit end, and the cross-sectional area of ​​the light cone gradually increases from the incident end to the exit end. The light source 21 is located at the incident end, and the first lens 23 is located at the exit end. Specifically, the incident end of the light cone is located at the light inlet of the support 70, and the exit end of the light cone is located at the light outlet of the support 70. In this way, using a light cone for light concentration can improve the efficiency of the optical component 20, reduce light loss, increase brightness, and also reduce costs.

[0054] Further, see Figure 1 and Figure 6 The projection engine also includes a bracket 70 connected to the housing 10. The bracket 70 has a receiving cavity 71 adapted to the light cone, which is housed within the cavity 71. The side wall of the bracket 70 has heat dissipation holes 72 communicating with the cavity 71. Thus, the bracket 70 facilitates the installation of the light cone. Furthermore, since a large amount of light is converted into heat on the light cone, causing its temperature to rise, the heat dissipation holes 72 on the side wall of the bracket 70 allow external airflow to cool the light cone, preventing overheating and damage to the optical components. The heat dissipation holes 72 also help dissipate heat from inside the projection engine. It should be noted that the number and shape of the heat dissipation holes 72 can be customized according to actual conditions and are not specifically limited here.

[0055] Specifically, see Figure 1A mounting groove 13 is formed by the first heat exchange chamber 111, the air-cooled chamber 113, and the second heat exchange chamber 112. The bracket 70 and the light cone are both disposed within the mounting groove 13. A light-transmitting hole is provided at the bottom of the mounting groove 13, and the first lens 23 is disposed within the light-transmitting hole. It should be noted that the mounting groove 13 penetrates the housing 10 along a first direction, and the first heat exchange chamber 111 and the second heat exchange chamber 112 are located on both sides of the bracket 70 in a second direction, wherein the first and second directions are perpendicular. Thus, with both the bracket 70 and the light cone disposed within the mounting groove 13, the cooling airflow flowing outside the housing 10 can enter the mounting groove 13 through its opening, then enter the receiving cavity 71 of the bracket 70 through the heat dissipation hole 72. The airflow, after heat exchange, can exit through the heat dissipation hole 72 and the opening of the mounting groove 13, thereby cooling the light cone, improving its heat dissipation efficiency, and preventing damage to the optical components due to excessively high light cone temperatures.

[0056] In one embodiment, see Figure 1 The second lens 25 and the housing 10 further enclose a second sealed chamber 12, which is located on the side of the air-cooled chamber 113 away from the light-collecting element 22. The optical assembly 20 also includes a projection lens 28 and a reflector 27. The reflector 27 and at least part of the projection lens 28 are disposed within the second sealed chamber 12. The reflector 27 reflects the light emitted from the second lens 25 to the projection lens 28. Thus, the housing 10 is divided into a first sealed chamber 11 and a second sealed chamber 12 by the second lens 25. The liquid crystal light valve 24, the fan 40, etc., are disposed in the first sealed chamber 11, while the reflector 27 and the projection lens 28 are disposed in the second sealed chamber 12. This prevents heat generated by the liquid crystal light valve 24, etc., in the first sealed chamber 11 from entering the second sealed chamber 12 and affecting the projection lens 28. Furthermore, by placing the reflector 27 within the second sealed chamber 12, the reflector 27 can fold the light path, reducing the size of the housing 10, thereby enabling miniaturization of the projection optical engine. Of course, in other embodiments, the reflector 27 may not be provided in the second closed chamber 12. The light emitted from the light source 21 is focused by the light-concentrating element 22 and then passes through the first lens 23, the liquid crystal light valve 24 and the second lens 25 in sequence to directly illuminate the projection lens 28, so that the light path is in a straight line.

[0057] Furthermore, the second enclosed chamber 12 is located below the projection lens 28, and the fan 40 is located inside the second enclosed chamber 12. In this way, space can be fully utilized, which is beneficial to reducing the size of the projection optical engine.

[0058] See Figure 1 One embodiment of the projection device of the present invention includes the projection optical engine of any of the above embodiments. The beneficial effects of the projection device can be referred to the beneficial effects of the projection optical engine, and will not be repeated here.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly 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 top" 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 "under" 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.

[0063] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A projection optical engine, characterized in that, include: chassis; An optical assembly includes a light source and a focusing element, a first lens, a liquid crystal light valve, and a second lens arranged sequentially along the propagation path of the light emitted from the light source. The first lens, the second lens, and the housing enclose a first sealed chamber. The first sealed chamber includes an air-cooled chamber, a first heat exchange chamber, and a second heat exchange chamber. The first heat exchange chamber and the second heat exchange chamber are located on opposite sides of the focusing element. The air-cooled chamber is located between the first heat exchange chamber and the second heat exchange chamber and communicates with both of them. The liquid crystal light valve is located within the air-cooled chamber. A first air duct is formed between the first lens and the liquid crystal light valve, and a second air duct is formed between the liquid crystal light valve and the second lens. One end of the first air duct communicates with one end of the first heat exchange chamber and one end of the second air duct, and the other end of the second air duct communicates with the other end of the first air duct through the second heat exchange chamber. A heat exchange device, wherein the heat exchange device is disposed on the cavity wall of the first heat exchange chamber and / or the second heat exchange chamber, and a portion of the heat exchange device is located within the first heat exchange chamber and / or the second heat exchange chamber; A fan is provided in the first heat exchange chamber or the second heat exchange chamber. The fan has an air inlet and an air outlet. The air outlet is connected to the first air duct, and the air inlet is connected to the second air duct. The fan is used to drive the heat dissipation airflow in the first heat exchange chamber, the air-cooled chamber and the second heat exchange chamber to circulate and flow through the liquid crystal light valve and the heat exchange device.

2. The projection optical engine according to claim 1, characterized in that, The heat exchange device includes a first heat exchanger, which includes a first heat dissipation part and a first heat exchange part. The first heat exchange part is disposed inside the first heat exchange chamber, and the first heat dissipation part is disposed outside the first heat exchange chamber.

3. The projection optical engine according to claim 2, characterized in that, The projection optical engine further includes a first partition, one end of which is sealed to the side of the liquid crystal light valve near the first heat exchange chamber, and the other end extends into the first heat exchange chamber and has a first gap with the cavity wall of the first heat exchange chamber away from the liquid crystal light valve, so as to divide the first heat exchange chamber into a third air duct near the light focusing element and a fourth air duct away from the light focusing element. One end of the third air duct is connected to the fourth air duct through the first gap, the other end of the third air duct is connected to the first air duct, and the other end of the fourth air duct is connected to the second air duct.

4. The projection optical engine according to claim 3, characterized in that, The first heat exchange section is disposed in the fourth air duct, and the first heat exchange section extends from one end of the fourth air duct near the air-cooled chamber to the other end of the fourth air duct away from the air-cooled chamber.

5. The projection optical engine according to claim 4, characterized in that, The end of the first heat exchange section away from the air-cooled chamber passes through the first interval and extends into the third air duct; the height of the first interval is less than half the height of the first heat exchange chamber.

6. The projection optical engine according to claim 1, characterized in that, The projection optical engine further includes a second partition, one end of which is sealed to the side of the liquid crystal light valve near the second heat exchange chamber, and the other end extends into the second heat exchange chamber, having a second gap between it and the cavity wall of the second heat exchange chamber away from the liquid crystal light valve, so as to divide the second heat exchange chamber into a fifth air duct away from the focusing element and a sixth air duct near the focusing element; the air outlet is located at the end of the fan near the air-cooled chamber, and the two sides of the end of the fan with the air outlet respectively abut against the second partition and the housing, and the air outlet is connected to the first air duct through the sixth air duct; the air inlet is located on the side of the fan away from and / or facing the focusing element, and the air inlet is connected to the second air duct through the second gap and the fifth air duct.

7. The projection optical engine according to claim 6, characterized in that, The heat exchange device further includes a second heat exchanger, which includes a second heat dissipation section and a second heat exchange section. The second heat exchange section is located inside the second heat exchange chamber, and the second heat dissipation section is located outside the second heat exchange chamber.

8. The projection optical engine according to claim 7, characterized in that, The second heat exchange section is disposed in the fifth air duct, and the second heat exchange section extends from one end of the fifth air duct near the air-cooled chamber to the other end of the fifth air duct away from the air-cooled chamber.

9. The projection optical engine according to claim 1, characterized in that, The optical assembly also includes a heat-insulating optical plate, which is disposed within the air-cooled cavity. The heat-insulating optical plate is disposed between the first lens and the liquid crystal light valve, and the heat-insulating optical plate and the first lens are sealed together, forming the first air duct between the heat-insulating optical plate and the liquid crystal light valve; or, the heat-insulating optical plate divides the first air duct into a first branch air duct and a second branch air duct in parallel, wherein the first branch air duct is formed between the first lens and the heat-insulating optical plate, and the second branch air duct is formed between the heat-insulating optical plate and the liquid crystal light valve. Alternatively, the heat-insulating optical plate is disposed on the side of the first lens away from the liquid crystal light valve, and the heat-insulating optical plate and the first lens are sealed together.

10. The projection optical engine according to claim 1, characterized in that, The light-concentrating element is a light cone, which has an incident light end and an exit light end. The cross-sectional area of ​​the light cone gradually increases along the direction from the incident light end to the exit light end. The light source is located at the incident light end, and the first lens is located at the exit light end.

11. The projection optical engine according to claim 10, characterized in that, The projection optical engine also includes a bracket connected to the housing. The bracket has a receiving cavity adapted to the light cone, the light cone is disposed in the receiving cavity, and the side wall of the bracket has heat dissipation holes communicating with the receiving cavity.

12. The projection optical engine according to claim 1, characterized in that, The second lens and the housing further enclose a second sealed chamber, which is located on the side of the air-cooled chamber away from the light-concentrating element; the optical assembly also includes a projection lens and a reflector, the reflector and at least part of the projection lens are disposed in the second sealed chamber, and the reflector is used to reflect the light emitted from the second lens to the projection lens.

13. A projection device, characterized in that, Includes the projection optical engine as described in any one of claims 1 to 12.

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