A sealed semi-vertical LCD projection optical machine

Abstract

The present invention discloses a sealed semi-vertical LCD projection optical machine, comprising an optical machine housing, an optical component and a heat dissipation component; the optical machine housing is provided with a light source installation port, a lens installation port, a heat exchange installation port and a reflector installation port; the optical component comprises an LED light source, a condenser, an illumination reflector, a collimating lens, a heat-reflecting glass, an LCD light valve, a field lens, an imaging reflector and a projection lens arranged in sequence according to the direction of light travel; the heat dissipation component comprises a radiator, an external fan, an air guide cover, a heat exchange component, an internal fan, a heat expander and a return air duct. The present invention makes the structure of the fully sealed optical machine simpler and the heat dissipation more efficient under a new optical path structure shape, creating favorable conditions for the simpler and more efficient production of the fully sealed optical machine, outputting higher brightness and better durability.

Description

Technical Field

[0001] The invention relates to the field of projectors, and in particular to a sealed semi-vertical LCD optical machine. Background Art

[0002] Single LCD projectors with fully sealed optical systems have been rare in the industry since their birth in 2009. In addition to high cost, complex structure and cumbersome production, another big problem is that after sealing, because the transmission efficiency of LCD light valve is too low, most of the energy of the illumination light is concentrated inside the optical machine to form Joule heat, which is difficult to transfer to the outside of the optical machine efficiently. In order to maintain the thermal working reliability of the optical machine, especially the liquid crystal, the existing technology almost all chooses to sacrifice the output brightness of the projector, that is, to reduce the power of the projection light source (total heat source) to maintain the temperature threshold of the optical machine. Therefore, in view of the above technical constraints, the fully sealed single LCD projection optical machine has not become popular in the industry.

[0003] In the process of people's continuous attempts to achieve full sealing, even cooling technologies such as Peltier, multi-dimensional thermal conductivity technologies such as temperature spreaders, cutting-edge technologies such as graphene, advanced materials such as thermally conductive plastics, etc., have been applied to fully sealed optical machines. The commonality of these technologies is that they further, significantly, and even the market cannot accept them at all, increase the production cost of optical machines and the cumbersome difficulty of the process. For example, an optical machine that uses a 3.5-inch FHD light valve to achieve a 200Lm output uses graphene for heat conduction and heat expansion. The cost increase is more than 15-20 times that of the original optical machine. The market is unlikely to accept such high-priced and inefficient products; some technologies also greatly reduce the reliability of optical machines, such as semiconductor refrigeration and thermally conductive plastics. Therefore, these new application technologies have almost never gained basic market recognition.

[0004] In 2020, the shipment volume of single LCD projectors hit a record high, surpassing the 10 million mark. Some influential brand merchants have also actively joined in. Although the open optical system is relatively easy to dissipate heat and has a high output brightness, it is almost completely non-durable and weather-resistant to real working environments such as dust, moisture, and smoke. The brightness of the sealed optical machine is too low and the cost performance is low, lacking strong market adaptability. These inherent deficiencies are difficult for merchants who already have a certain brand value and level to accept, because they represent the needs of users with higher quality requirements, that is, the product must have a certain degree of durability and weather resistance in real working environments such as dust, moisture, and smoke, to provide users with more lasting value, and the product must have a higher output brightness to meet user needs. Therefore, on the road to the transformation of single LCD projectors to consumer digital products, how to solve the engineering and technical problems of low output brightness, high cost, complex structure, and cumbersome production of sealed optical machines has become a problem that technicians in this field need to continue to solve. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a sealed semi-vertical LCD projection optical machine, which obtains a brand-new optical path structure shape, makes the structure of the fully sealed optical machine simpler and the heat dissipation more efficient, and creates favorable conditions for the fully sealed optical machine to be manufactured more simply and efficiently, output higher brightness and better durability.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a closed semi-vertical LCD projection optical machine, including an optical machine housing, an optical component and a heat dissipation component; the optical machine housing is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port; the optical component includes an LED light source, a condenser, an illumination reflector, a collimating lens, a heat-reflecting glass, an LCD light valve, a field mirror, an imaging reflector and a projection lens, which are arranged in sequence according to the direction of light travel.

[0007] The heat dissipation component includes a radiator, an external fan, an air guide cover, a heat exchange component, an internal fan, a heat diffuser and a return air duct.

[0008] The LED light source is located at the light source mounting port, the projection lens is located at the lens mounting port, the lighting reflector is located at the reflector mounting port, the radiator is located outside the optical machine housing and is arranged in close proximity to the LED light source, and the heat exchange assembly is installed at the heat exchange mounting port, so that the interior of the optical machine housing is sealed and isolated from the external air.

[0009] The condenser, collimating lens, heat-reflecting glass, LCD light valve, field lens and imaging reflector are located in the optical machine housing. The illumination reflector reflects and deflects the light irradiating the LCD light valve in the up-down direction, and the imaging reflector reflects and deflects the light emitted by the LCD light valve in the left-right direction.

[0010] The external fan is located outside the optical machine housing and connected to the outer wall of the optical machine housing; the internal fan is installed inside the optical machine housing.

[0011] A first channel is formed between the reflecting surfaces of the condenser and the illumination reflector and the incident surface of the collimating lens; a second channel is formed between the exit surface of the collimating lens and the incident surface of the heat-reflecting glass; a third channel is formed between the exit surface of the heat-reflecting glass and the incident surface of the LCD light valve; a fourth channel is formed between the exit surface of the LCD light valve and the incident surface of the field lens; the return air duct is located outside the optical machine housing, and one end of the return air duct is connected to the first channel, and the other end is connected to the air inlet of the internal fan.

[0012] The heat exchange assembly includes a heat absorbing part located inside the optical machine housing, and a heat releasing part connected to the heat absorbing part and located outside the optical machine housing; the air outlet of the internal fan is aligned with one end of the heat absorbing part, and the other end of the heat absorbing part is opposite to the second channel, the third channel and the fourth channel; the heat releasing part and the radiator are arranged side by side; the heat spreader is attached to the outer surface of the lighting reflector. Preferably, the heat absorbing part is composed of multiple metal sheets arranged side by side, and gaps are reserved between adjacent metal sheets to form a ventilation heat absorbing pipeline.

[0013] The forced airflow generated by the internal fan is divided into a first part of the airflow and a second part of the airflow after passing through the heat absorption part; the second part of the airflow flows back to the air inlet of the internal fan through the fourth channel; a part of the first part of the airflow flows back to the air inlet of the internal fan after passing through the third channel; another part of the first part of the airflow flows back to the air inlet of the internal fan after passing through the second channel, the first channel and the return air duct in sequence.

[0014] The air inlet of the external fan is opposite to the heat diffuser, and the air outlet of the external fan is connected to the air guide cover; the air outlet of the air guide cover is aligned with the radiator and the heat release part. Preferably, the external fan is a turbo fan.

[0015] Preferably, the lighting reflector is made of a mirrored aluminum plate.

[0016] Preferably, the condenser is a plano-convex lens, the plane faces the LED light source, and the convex surface is a deformed aspheric surface or an XY polynomial free-form surface.

[0017] Furthermore, the heat exchange component also includes a guide member and a diverter installed in the heat absorption part; the guide member and the diverter are arc-shaped thin film structures, and the diverter divides the forced airflow generated by the internal fan into the first part of the airflow and the second part of the airflow; the guide member is used for guiding the first part of the airflow.

[0018] Furthermore, the heat dissipation assembly also includes a first air guide portion located in the optical machine housing and used to guide the fourth channel, a second air guide portion located in the optical machine housing and used to guide the third channel, and a third air guide portion located in the optical machine housing and used to connect the first channel and the second channel.

[0019] Furthermore, the number of the internal fans is one or more, and the internal fans are turbo fans.

[0020] Preferably, the radiator, the heat release part and the heat diffuser are straight rib aluminum radiators.

[0021] Optionally, the return air duct is made of metal material.

[0022] Optionally, the heat dissipation assembly further includes a heat diffusion structure provided on the inner wall and the outer wall of the return air duct.

[0023] The present invention obtains a new light path structure shape by combining the illumination reflector and the imaging reflector in different directions, creates a new optical-mechanical stacking shape and has a decisive influence on the appearance of the projector. It is different from the existing horizontal or vertical projector appearance and provides users with a new choice.

[0024] The sealed semi-vertical LCD projection optical machine provided by the present invention has excellent durability and weather resistance compared to an open optical path, and provides users with more lasting value.

[0025] The sealed semi-vertical LCD projector provided by the present invention improves the heat exchange inside and outside the traditional sealed projector, adds a heat expander and a return air duct for heat absorption and heat dissipation, connects the first channel and the internal fan, so that the heat exchange capacity inside and outside the projector can be increased by more than one time; by arranging the guide and the diverter inside the heat exchange component, and arranging each air guide part on each channel, it is helpful to reduce the wind resistance of the wind flow circulation loop inside the projector and improve the heat exchange coefficient of the heat dissipation system. It creates a favorable basic condition for the projector to output higher brightness.

[0026] The sealed semi-vertical LCD projection optical machine provided by the present invention has a simple overall structure through a light source mounting port, a lens mounting port, a heat exchange mounting port, and a reflector mounting port, and effectively solves the engineering and technical problems of the existing fully sealed LCD projection optical machine having a complex structure and complicated manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a cutaway perspective view of the projection optical machine of the present invention;

[0029] Figure 2 It is a cutaway perspective view of the projection optical machine of the present invention;

[0030] Figure 3 This is an exploded view of the projection optical machine of the present invention;

[0031] Figure 4 This is a diagram showing the overall appearance of the projection light machine of the present invention;

[0032] Figure 5 This is a diagram showing the overall appearance of the projection light machine of the present invention;

[0033] Figure 6 This is an exploded view of the heat exchange module of the present invention;

[0034] Figure 7 A schematic diagram of the bisector of the LCD light valve display window;

[0035] Figure 8 It is a cross-sectional schematic diagram of the return air duct of the present invention;

[0036] Fig. 9 It is a schematic diagram of the appearance of an existing horizontal projector;

[0037] Fig.10 The figure is a schematic diagram of the appearance of an existing vertical projector. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, or are the orientation or positional relationship in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiments

[0044] See Figure 1-8 The enclosed semi-vertical LCD projection optical machine provided in this embodiment includes an optical machine housing, an optical component and a heat dissipation component. The optical machine housing is provided with a light source installation port, a lens installation port, a heat exchange installation port and a reflector installation port. In this embodiment, the optical machine housing includes an optical machine lower shell 18, an optical machine cover plate 17 and an air duct cover plate 16 which are connected and stacked from bottom to top. The lower part of the optical machine lower shell 18 is provided with a light source installation port and a heat exchange installation port, and the side is provided with a lens installation port; the optical machine cover plate 17 is provided with a reflector installation port.

[0045] The optical assembly includes an LED light source 1, a condenser 2, an illumination reflector 3, a collimating lens 4, a heat-reflecting glass 19, an LCD light valve 5, a field lens 6, an imaging reflector 7 and a projection lens 8 which are arranged in sequence according to the direction of light travel.

[0046] The condenser 2 uses a single lens with a plano-convex structure to achieve condensed illumination. The convex surface is an XY polynomial free-form surface, which can easily achieve the light distribution characteristics of the LED light source 1 and the light matching of the LCD light valve 5 under the constraints of the projection lens 8, and achieve uniform, efficient and cheap illumination.

[0047] The lighting reflector 3 is made of a mirror aluminum plate cut into a required size, preferably a 1.2 mm thick mirror aluminum plate with a total reflectivity of ≥95% produced by Al anod of Germany.

[0048] The heat dissipation component includes a radiator 9 , an external fan 10 , an air guide cover 11 , a heat exchange component 12 , an internal fan 13 , a heat expander 14 , and a return air duct 15 .

[0049] The LED light source 1 is located at the light source mounting port, the projection lens 8 is located at the lens mounting port, the lighting reflector 3 is located at the reflector mounting port, the radiator 9 is located outside the optical machine housing and is installed in close proximity to the LED light source 1; the heat exchange component 12 is installed at the heat exchange mounting port, so that the interior of the optical machine housing is sealed and isolated from the external air, thereby achieving complete air-tight isolation.

[0050] The condenser 2, the collimating lens 4, the heat-reflecting glass 19, the LCD light valve 5, the field lens 6 and the imaging reflector 7 are located in the optical machine housing.

[0051] See also Figure 7 , Ls is the long side of the display window 51 of the LCD light valve 5, Ss is the short side of the display window 51, x' is the bisector of Ss, and y' is the bisector of Ls.

[0052] When viewed along the direction of the optical path, the illumination reflector 3 reflects and deflects the light irradiating the LCD light valve 5 in the up and down directions. That is, after the illumination reflector 3 is set, the area originally irradiated on the upper side of the LCD light valve 5 ( Figure 7 The light along the horizontal bisector of the display window 51 ( Figure 7 The x' in the figure is reflected on the area below the LCD light valve 5 in a mirrored manner. Similarly, the area below the LCD light valve 5 ( Figure 7 The imaging reflector 7 reflects the light emitted from the LCD light valve 5 in the left and right directions, that is, along the vertical bisector ( Figure 7 Because of the existence of the imaging reflector 7, the light emitted from the LCD light valve 5 is mirrored in the left and right directions (along y') when it reaches the projection lens 8.

[0053] The external fan 10 is located outside the optical machine housing and connected to the optical machine housing; the internal fan 13 is installed inside the optical machine housing. The internal fan 13 uses a turbo fan, and the number is one or more. In this embodiment, there are two internal fans 13 to obtain a larger wind pressure.

[0054] A first channel is formed between the reflecting surfaces of the condenser 2 and the illumination reflector 3 and the incident surface of the collimating lens 4; a second channel is formed between the exit surface of the collimating lens 4 and the incident surface of the heat-reflecting glass 19; a third channel is formed between the exit surface of the heat-reflecting glass 19 and the incident surface of the LCD light valve 5; a fourth channel is formed between the exit surface of the LCD light valve 5 and the incident surface of the field lens 6; the return air duct 15 is located outside the optical machine housing, one end of which is connected to the first channel, and the other end of which is connected to the air inlet of the internal fan 13.

[0055] The heat exchange component 12 includes a heat absorbing part 121 located inside the optical machine housing, and a heat releasing part 122 connected to the heat absorbing part 121 and located outside the optical machine housing; the air outlet of the internal fan 13 is aligned with one end of the heat absorbing part 121, and the other end of the heat absorbing part 121 is opposite to the second channel, the third channel and the fourth channel; the heat releasing part 122 is arranged side by side with the radiator 9; the heat diffuser 14 is attached to the outer surface of the lighting reflector 3.

[0056] When the forced airflow generated by the internal fan 13 passes through the heat absorption part 121, the air collides with the heat absorption part 121 and transfers the heat to the heat absorption part 121. The heat absorption part 121 conducts the heat to the heat release part 122 with extremely low thermal resistance, wherein the forced airflow is divided into a first part of airflow a and a second part of airflow b after passing through the heat absorption part 121; the second part of airflow b dissipates heat from the exit surface of the LCD light valve 5 in the fourth channel and then flows back to the air inlet of the internal fan 13; a part of airflow d of the first part of airflow a dissipates heat from the incident surface of the LCD light valve 5 in the third channel and then flows back to the air inlet of the internal fan 13, and at the same time, another part of airflow c of the first part of airflow a flows back to the air inlet of the internal fan 13 after passing through the second channel, the first channel and the inner wall of the return air duct 15 in sequence. Among them, in the second channel, another part of the wind flow c dissipates the heat to the incident surface of the heat-reflecting glass 19, and in the first channel, another part of the wind flow c collides with the reflecting surface of the lighting reflector 3, and transfers the heat carried by the other part of the wind flow c to the lighting reflector 3. Then, inside the return air duct 15, another part of the wind flow c collides with the inner wall of the return air duct 15, and continues to efficiently transfer the residual heat to the return air duct 15, and diffuses the heat into the atmosphere through the heat diffuser 14 attached to the outer wall of the lighting reflector 3 and the outer wall of the return air duct 15. Inside the projection light machine, the devices for heating the circulating air mainly include the LCD light valve 5 and the heat-reflecting glass 19, and the parts that absorb the heat of the circulating air mainly include the heat-absorbing part 121 of the heat exchange component 12, the reflecting surface of the lighting reflector 3 and the inner wall of the return air duct 15; outside the projection light machine, the heat-releasing part 122 of the heat exchange component 12, the heat diffuser 14 and the outer wall of the return air duct 15 diffuse the corresponding heat into the air to maintain the thermal balance of the temperature rise inside the light machine.

[0057] The air inlet of the external fan 10 is opposite to the heat diffuser 14, and the air outlet of the external fan 10 is connected to the air guide cover 11. The air outlet of the air guide cover 11 is aligned with the radiator 9 and the heat release part 122, so that the LED light source 1 and the heat release part 122 of the heat exchange component 12 can be efficiently dissipated simultaneously by an external fan 10, so that the heat inside the projection light machine can be taken away by the external fan 10, thereby achieving the cooling of the air inside the projection light machine. As far as the fully sealed LCD projection light machine currently released by the industry is concerned, due to layout, volume and cost, there is no case of using a fan to blow air to the heat release part of the heat exchange component 12. Preferably, the external fan 10 adopts a turbo fan.

[0058] In this embodiment, the radiator 9, the heat release part 122 and the heat diffuser 14 are preferably straight rib aluminum radiators, which are inexpensive and good quality and do not have durability and quality dispersion problems such as heat pipe radiators. The air inlet of the external fan 10 is opposite to the ribs of the heat diffuser 14. The air outlet of the air guide 11 is opposite to the ribs of the radiator 9 and the heat release part 122.

[0059] In this embodiment, the heat absorption part 121 is composed of multiple metal sheets arranged side by side, and gaps are reserved between adjacent metal sheets to form a ventilation heat absorption pipeline. The material of the metal sheet is preferably copper, and the ratio of the gap to the thickness of the metal sheet is 3-4:1. In this embodiment, the thickness of the metal sheet is 0.4mm and the gap is 1.4mm.

[0060] The existing projection optical path structure using two reflectors has the same reflection and turning direction for the light, for example, the same left and right direction (along the Figure 7 y'), or in both up and down directions (along Figure 7 In this embodiment, the illumination reflector 3 and the imaging reflector 7 are combined in different directions (see Figure 7 , the illumination reflector 3 is to mirror the light along x', and the imaging reflector 7 is to mirror the light along y'), thus obtaining a new optical path structure shape, creating a new optical-mechanical stack and affecting and determining the shape of the projector, which is different from the existing horizontal type (see Fig. 9 , w' / h' is usually about ≥2, P' is the projection lens) or vertical (see Fig.10 , h" / w" is about 1.18-2.5, P" is the projection lens) of the projector, providing users with a new choice.

[0061] The sealed semi-vertical LCD projection optical engine provided in this embodiment has excellent durability and weather resistance compared to an open optical path, providing users with more lasting value.

[0062] The sealed semi-vertical LCD projector provided in this embodiment improves the internal and external heat exchange of the traditional sealed projector by adding a heat diffuser 14 and a return air duct 15 for heat absorption and heat dissipation, and connects the first channel of the heat dissipation blind spot of the prior art with the internal fan 13, so that the heat exchange capacity inside and outside the projection light machine can be increased by more than double.

[0063] See also Figure 1 , Figure 6 The heat exchange component 12 also includes a guide 123 and a diverter 124 installed in the heat absorption part 121; the guide 123 and the diverter 124 are arc-shaped thin film structures; the diverter 124 divides the forced airflow generated by the internal fan 13 into a first part of the airflow a and a second part of the airflow b; the guide 123 is used for guiding the first part of the airflow a, and the guide 123 is set to reduce the wind resistance of the first part of the airflow a.

[0064] See also Figure 1 and 2 The heat dissipation assembly further includes a first air guide 20 located in the optical machine housing and used for guiding the fourth channel, a second air guide 21 located in the optical machine housing and used for guiding the third channel, and a third air guide 22 located in the optical machine housing and used for connecting the first channel and the second channel. The first air guide 20 is arranged on the inner wall of the optical machine cover 17. The second air guide 21 is arranged on the inner wall of the air duct cover 16, and the third air guide 22 connecting the second channel and the first channel is arranged at the same time. All the air guides mentioned above are streamlined to reduce the wind resistance of the internal wind flow.

[0065] In this embodiment, by providing the guide member 123 and the diverter member 124 inside the heat exchange assembly 12, and providing each air guide portion on each channel, it is helpful to reduce the wind resistance of the wind circulation loop inside the projection optical machine and improve the heat exchange coefficient of the heat dissipation system, creating a favorable basic condition for the projector to output higher brightness.

[0066] In this embodiment, the return air duct 15 is made of metal material. Furthermore, a heat diffusion structure is provided on the return air duct 15. Figure 8 As shown, rib-shaped heat diffusion structures are made on the inner wall and the outer wall of the return air duct 15 to further cool the air flowing through the return air duct 15 .

[0067] The existing projector is provided with a piece of anti-heat glass 19 made of DBEF (Dual Brightness Enhancement Film) or APF (Advanced Polarizer Film) film material such as 3M Company of the United States at a position of about 2-3mm behind the exit surface of the collimating lens 4 (that is, the DBEF or APF film is attached to a piece of white plate glass, and the film is generally attached to the incident surface), so as to significantly cool down the LCD light valve 5, which has become a common practice in the current industry. The above-mentioned film material reflects back a line of polarized light in the illumination light that is useless to the LCD light valve 5, and only transmits a line of polarized light that is useful to the LCD light valve 5. Therefore, in theory, the light irradiating the LCD light valve 5 is reduced by half, and the heat generation will also be reduced by 1 time. This part of the reflected light is reflected back and forth or diffusely reflected many times inside the optical machine housing and on the optical path, and is finally absorbed by the optical machine housing and optical devices and converted into heat. The optical machine housing is generally made of ordinary plastic material due to cost considerations. For example, the thermal conductivity of the commonly used ABS plastic is only 0.02-0.046W / m·K. Not only does it conduct heat almost nothing, it also has excellent thermal insulation effect. Therefore, once the heat is deposited inside the projection optical machine, it is difficult to dissipate it quickly. This is also a key factor that restricted the brightness of fully sealed optical machines in the past. The fact that the light irradiating the LCD light valve 5 is reduced by half does not mean that the working environment of the LCD light valve 5 is improved by half.

[0068] The anti-heat glass 19 reflects ≥50% of the light. This part of heat has not attracted people's attention in the past. It is always believed that it will not endanger the safety of the LCD light valve 5. However, it actually raises the temperature of the entire projection light machine. For example, in the first channel mentioned above, on the sealed light machine, people have never taken any heat dissipation measures.

[0069] In the existing optical machine with an illumination reflector 3 disposed between the LED light source 1 and the collimating lens 4, the industry habitually selects a cost-effective aluminum film reflector (i.e., a layer of aluminum reflective film is deposited or vacuum-plated on the surface of a flat glass substrate), which has a low reflectivity (usually 82-86%), and the thermal conductivity of the glass substrate is extremely poor (thermal conductivity is about 0.8-1W / m·k). The above-mentioned useless light will be continuously reflected back and forth multiple times inside the optical machine housing, between the heat-reflecting glass 19 and the substrate surface of the LED light source 1, and each time it reaches the illumination reflector 3, it will absorb 14-18% of the heat (optical power), while the absorption rate of the condenser 2 and the collimating lens 4 is relatively much lower, so most of the above-mentioned useless light is absorbed by the optical machine housing and the illumination reflector 3 corresponding to the first channel, so it is a reasonable measure to dissipate the heat of the optical machine housing corresponding to the first channel and diffuse the internal heat through the illumination reflector 3.

[0070] Another part of the wind flow c flows through the surface of the lighting reflector 3 to transfer the heat to the lighting reflector 3. In this embodiment, preferably, the lighting reflector 3 is made of a mirror aluminum plate, wherein the thermal conductivity of the mirror aluminum plate is close to that of pure aluminum, so the heat is further efficiently transferred to the heat diffuser 14, and most of the heat of the useless light is diffused into the atmosphere through the external fan 10. The setting of the return air duct 15, in addition to innovatively connecting the first channel and the internal fan 13, further diffuses the residual heat into the atmosphere.

[0071] The sealed semi-vertical LCD projection optical machine provided in this embodiment also simplifies the overall structure through the light source mounting port, the lens mounting port, the heat exchange mounting port, and the reflector mounting port, effectively solving the engineering and technical problems of the existing fully sealed LCD projection optical machine with complex structure and complicated production.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A closed semi-vertical LCD projection optical machine, characterized in that: The invention comprises an optical machine housing, an optical component and a heat dissipation component; the optical machine housing is provided with a light source mounting port, a lens mounting port, a heat exchange mounting port and a reflector mounting port; the optical component comprises an LED light source (1), a condenser (2), an illumination reflector (3), a collimating lens (4), a heat-reflecting glass (19), an LCD light valve (5), a field lens (6), an imaging reflector (7) and a projection lens (8) which are arranged in sequence according to the direction of light travel; The heat dissipation component comprises a radiator (9), an external fan (10), an air guide cover (11), a heat exchange component (12), an internal fan (13), a heat diffuser (14) and an air return duct (15); The LED light source (1) is located at the light source mounting port, the projection lens (8) is located at the lens mounting port, the lighting reflector (3) is located at the reflector mounting port, the heat sink (9) is located outside the optical machine housing and is arranged in close contact with the LED light source (1), and the heat exchange component (12) is installed at the heat exchange mounting port, so that the interior of the optical machine housing is sealed and isolated from the external air; The condenser lens (2), the collimating lens (4), the heat-reflecting glass (19), the LCD light valve (5), the field lens (6) and the imaging reflector (7) are located in the optical machine housing; The illumination reflector (3) reflects and deflects the light irradiating the LCD light valve (5) in the up-down direction, and the imaging reflector (7) reflects and deflects the light emitted by the LCD light valve (5) in the left-right direction; The external fan (10) is located outside the optical machine housing and connected to the outer wall of the optical machine housing; the internal fan (13) is installed inside the optical machine housing; A first channel is formed between the reflecting surfaces of the condenser (2) and the illumination reflector (3) and the incident surface of the collimating lens (4); a second channel is formed between the exit surface of the collimating lens (4) and the incident surface of the heat-reflecting glass (19); a third channel is formed between the exit surface of the heat-reflecting glass (19) and the incident surface of the LCD light valve (5); a fourth channel is formed between the exit surface of the LCD light valve (5) and the incident surface of the field lens (6); the return air duct (15) is located outside the optical machine housing, and one end of the return air duct (15) is connected to the first channel, and the other end is connected to the air inlet of the internal fan (13); The heat exchange component (12) comprises a heat absorbing part (121) located inside the optical machine housing, and a heat releasing part (122) connected to the heat absorbing part (121) and located outside the optical machine housing; the air outlet of the internal fan (13) is aligned with one end of the heat absorbing part (121), and the other end of the heat absorbing part (121) is opposite to the second channel, the third channel and the fourth channel; the heat releasing part (122) and the radiator (9) are arranged side by side; and the heat spreader (14) is attached to the outer surface of the lighting reflector (3); The forced airflow generated by the internal fan (13) is divided into a first airflow and a second airflow after passing through the heat absorption part (121); the second airflow flows back to the air inlet of the internal fan (13) through the fourth channel; a part of the first airflow flows back to the air inlet of the internal fan (13) after passing through the third channel; and another part of the first airflow flows back to the air inlet of the internal fan (13) after passing through the second channel, the first channel and the return air duct (15) in sequence; The air inlet of the external fan (10) is opposite to the heat diffuser (14), and the air outlet of the external fan (10) is connected to the air guide cover (11); the air outlet of the air guide cover (11) is aligned with the radiator (9) and the heat release part (122).

2. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The lighting reflector (3) is made of a mirrored aluminum plate.

3. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The condenser (2) is a plano-convex lens, the plane of which faces the LED light source (1), and the convex surface is a deformed aspheric surface or an XY polynomial free-form surface.

4. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The heat exchange assembly (12) further comprises a flow guide (123) and a flow divider (124) installed in the heat absorption part (121); the flow guide (123) and the flow divider (124) are in the form of an arc-shaped thin sheet structure; the flow divider (124) divides the forced airflow generated by the internal fan (13) into the first part of the airflow and the second part of the airflow; the flow guide (123) is used for guiding the first part of the airflow.

5. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The heat dissipation assembly further comprises a first air guide portion (20) located in the optical machine housing and used for guiding air in the fourth channel, a second air guide portion (21) located in the optical machine housing and used for guiding air in the third channel, and a third air guide portion (22) located in the optical machine housing and used for connecting the first channel and the second channel.

6. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The number of the internal fans (13) is one or more, and the internal fans (13) are turbo fans.

7. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The external fan (10) is a turbo fan.

8. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The radiator (9), the heat release portion (122) and the heat diffuser (14) are straight rib-type aluminum radiators.

9. The enclosed semi-vertical LCD projection optical machine according to claim 1, characterized in that: The return air duct (15) is made of metal material.

10. The enclosed semi-vertical LCD projection optical machine according to claim 9, characterized in that: The heat dissipation component also includes a heat diffusion structure arranged on the inner wall and the outer wall of the return air duct (15).

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