Projection optical path structure

Abstract

The present invention discloses a projection optical path structure, which includes a housing, a light source, a lens device and an LCD module. The lens device and the LCD module are both provided inside the housing. The light source and the LCD module are respectively located on both sides of the lens device. The lens device includes a first plano-convex lens and a second plano-convex lens arranged in parallel. The outer diameter of the first plano-convex lens is larger than that of the second plano-convex lens. The second plano-convex lens is located between the first plano-convex lens and the light source. By providing the lens device, including the first plano-convex lens and the second plano-convex lens, the second plano-convex lens can converge and collect the light emitted by the light source, greatly improving the light collection rate of the light and greatly reducing the amount of light loss. The light passing through the second plano-convex lens can be further converged by the first plano-convex lens and can better act on the LCD module, improving the clarity and brightness of the finally projected image.

Description

Technical Field

[0001] The present invention belongs to an optical path structure for projection, and particularly relates to a projection optical path structure. Background Art

[0002] When the projection optical path is in use, the light emitted by the LED lamp group is projected onto the screen. In the existing common optical light collection system, a separate first plano-convex lens is provided. Due to the optical path requirement and heat relationship, it is far from the LED light source. At this time, the light is absorbed and scattered by the lens bracket wall and scattered around the first plano-convex lens. As a result, too much light is lost, so that the brightness of the light spot formed on the LCD screen is reduced significantly, the low-brightness part at the edge of the light spot is significantly enlarged, and finally the brightness of the projected image is uneven and reduced, especially the edge sharpness is reduced, and the overall effect of the device is not good. Summary of the Invention

[0003] The purpose of the present invention is to provide a projection optical path structure that can solve at least one of the above problems.

[0004] According to one aspect of the present invention, a projection optical path structure is provided, which includes a housing, a light source, a lens device, and an LCD module. The lens device and the LCD module are both arranged in the housing. The light source and the LCD module are respectively located on both sides of the lens device. The lens device includes a first plano-convex lens and a second plano-convex lens arranged in parallel. The outer diameter of the first plano-convex lens is larger than that of the second plano-convex lens. The second plano-convex lens is located between the first plano-convex lens and the light source. The second plano-convex lens protrudes towards the first plano-convex lens side, and the first plano-convex lens protrudes towards the LCD module side. A groove is formed at the bottom of the housing, and the bottom of the LCD module is matched with the groove.

[0005] The beneficial effects of the present invention are as follows: By providing a lens device including a first plano-convex lens and a second plano-convex lens, the second plano-convex lens can converge and collect the light emitted by the light source, greatly improving the light collection rate of the light and greatly reducing the amount of light loss; the light passing through the second plano-convex lens can be further converged by the first plano-convex lens and can better act on the LCD module, improving the clarity and brightness of the image formed by the light transmitted through the LCD screen; by providing a groove at the bottom of the housing, the quick positioning and installation of the LCD module in the housing can be realized.

[0006] In some embodiments, the lens device further includes a lens holder. An accommodation cavity is provided inside the lens holder. An installation plate is provided inside the accommodation cavity. A first installation position is provided on the inner wall of the accommodation cavity, and a second installation position is provided on the installation plate. The first installation position is located on one side of the second installation position. The lens holder, the installation plate, the first installation position, and the second installation position are of an integrally formed structure. The first plano-convex lens is disposed on the first installation position, and the second plano-convex lens is disposed on the second installation position. The light source is located at the tail end of the lens holder, and the lens holder is fixed inside the housing. Thus, due to the integrally formed structure of the lens holder and various structural elements inside the lens holder, when installing the lens, there is no need to reassemble multiple brackets, improving the processing efficiency of the lens holder and facilitating the reduction of the overall cost. At the same time, by providing the first installation position and the second installation position, it is convenient to install the lenses on the respective installation positions, realizing the installation of two lenses on one lens holder, ensuring the optical path relationship formed by the lenses, simplifying the assembly steps, and simplifying the overall processing and assembly procedures. The overall structure is simple.

[0007] In some embodiments, the LCD module includes a front cover, a rear cover, a sealing glass, an LCD screen, and a gasket. The front cover cooperates with the rear cover. There are two pieces of sealing glass, and the two pieces of sealing glass are respectively fixed on the front cover and the rear cover. The LCD screen is disposed between the front cover and the rear cover. A cooling cavity is formed between the front cover and the rear cover. The LCD screen is located inside the cooling cavity. The gasket is clamped between the front cover and the rear cover. A pressure relief bladder is provided on the gasket, and the pressure relief bladder communicates with the cooling cavity. The cooling cavity is filled with a coolant. The front cover and the rear cover are fixed inside the housing, and the front cover is located on the side away from the lens device. Thus, by providing the cooling cavity, the LCD screen can be immersed in the coolant, and a large amount of heat accumulated on the surface of the LCD screen can be taken away by the coolant and conducted to the front cover and the rear cover for export, effectively avoiding excessive heat accumulation on the LCD screen, preventing the temperature of the LCD screen from being too high, keeping it within the normal working temperature range, improving the heat dissipation efficiency, and improving the safety and stability of the equipment during use. By providing the pressure relief bladder, when the coolant heats up and expands, the pressure relief bladder can expand, avoiding the phenomenon that the liquid expands due to the temperature rise and rapidly increasing the coolant leakage amount, ensuring the stability of the pressure inside the cooling cavity and the tightness of the coolant, and ensuring the overall service life.

[0008] In some embodiments, a receiving groove is provided on the inner side of the front cover and / or the rear cover, and the pressure relief bladder is located inside the receiving groove. Thus, by providing the receiving groove, it is convenient to install and place the pressure relief bladder and provides corresponding space for the expansion of the pressure relief bladder.

[0009] In some embodiments, the gasket is clamped at the peripheral mating portion between the front cover and the rear cover, and the pressure relief bladder and the gasket are of an integrally formed structure. Thus, it is convenient for the processing and forming of the pressure relief bladder, and at the same time, it ensures that the pressure relief bladder has a certain elasticity.

[0010] In some embodiments, an opening is provided on one side of the pressure relief bladder, the opening is in communication with the cooling chamber, a communication hole is provided at the bottom of the front cover or the rear cover, the communication hole is in communication with the cooling chamber, and the communication hole is in communication with the opening;

[0011] When the opening is located on the side close to the front cover, the communication hole is located on the front cover;

[0012] When the opening is located on the side close to the rear cover, the communication hole is located on the rear cover. Thus, by providing the communication hole, it is convenient for the coolant in the cooling chamber to flow into the pressure relief bladder; and the coolant in the pressure relief bladder can flow back into the cooling chamber.

[0013] In some embodiments, a reflecting cup is provided on the other side of the mounting plate, a light passing hole is provided on the reflecting cup, the light passing hole corresponds to the second plano-convex lens, and the light source is installed at the light passing hole. Thus, by providing the reflecting cup, it is convenient to install the light source, so that the light directly acts on the second plano-convex lens at the second mounting position after passing through the reflecting cup, improving the light efficiency.

[0014] In some embodiments, the projection optical path structure further includes a heat-insulating glass plate and a rear Fresnel lens, the heat-insulating glass plate is located between the lens device and the LCD module, and the rear Fresnel lens is located on the front side of the LCD module. Thus, the light can be made more uniform.

[0015] In some embodiments, the projection optical path structure further includes a control main board, the control main board is provided on the outside of the housing, and the control main board is electrically connected to the light source. Thus, by providing the control main board, it is convenient to control the light source.

[0016] In some embodiments, the projection optical path structure further includes a cooling pipe and a cooling fan, the cooling pipe is located on the outside of the front cover and the rear cover and is in contact with the front cover and the rear cover, the cooling pipe extends to the outside of the housing, and the cooling fan is fixed on the outside of the housing and is disposed opposite to the cooling pipe. Thus, by providing the cooling pipe and the cooling fan, the heat dissipation of the front cover and the rear cover can be accelerated, so that the local temperature can be more effectively reduced, the heat dissipation efficiency can be improved, and the overheating phenomenon of the LCD screen can be further avoided; at the same time, the cooling fan adopts a direct convection method to dissipate heat from the LCD module and the housing by sucking the relatively low-temperature air outside the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the projection optical path structure of the present invention.

[0018] Figure 2 is a cross-sectional structural diagram of the projection optical path structure of the present invention.

[0019] Figure 3 is a schematic structural diagram of the lens bracket of the lens device in the projection optical path structure of the present invention.

[0020] Figure 4 is Figure 3 A structural schematic diagram from another perspective.

[0021] Figure 5 is Figure 3 A sectional structural schematic diagram of

[0022] Figure 6 A structural schematic diagram of the LCD module in the projection optical path structure of the present invention.

[0023] Figure 7 is Figure 6 An exploded structural schematic diagram of

[0024] Figure 8 A front view structural schematic diagram of the LCD module in the projection optical path structure of the present invention.

[0025] Figure 9 is Figure 8 A sectional structural schematic diagram of A-A in

[0026] Figure 10 is Figure 8 A sectional structural schematic diagram of B-B in

[0027] Figure 11 A structural schematic diagram of the pressure relief liquid bladder of the LCD module in the projection optical path structure of the present invention.

[0028] Figure 12 is Figure 11 A sectional structural schematic diagram of Detailed implementation manners

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Referring to Figure 1 and Figure 2 . The projection optical path structure includes a housing 1, a light source 2, a lens device 3, and an LCD module 4. The lens device 3 and the LCD module 4 are both disposed inside the housing 1. The light source 2 and the LCD module 4 are respectively located on both sides of the lens device 3. The lens device 3 includes a first plano-convex lens 31 and a second plano-convex lens 32 arranged in parallel. The outer diameter of the first plano-convex lens 31 is larger than that of the second plano-convex lens 32. The second plano-convex lens 32 is located between the first plano-convex lens 31 and the light source 2. Among them, the light source 2 can be an LED light source or other alternative light sources; the second plano-convex lens 32 bulges toward the first plano-convex lens 31 side, and the first plano-convex lens 31 bulges toward the LCD module 4 side.

[0031] During installation, the axes of the lens device 3 and the LCD module 4 can be kept on the same straight line, which is beneficial to improving the uniformity of light.

[0032] During use, the light from the light source 2 first passes through the preliminary convergence of the second plano-convex lens 32, and then acts on the first plano-convex lens 31. After passing through the first plano-convex lens 31, it passes through the LCD module 4 and then emits. By providing the second plano-convex lens 32, the distance between the second plano-convex lens 32 and the light source 2 can be made closer. Thus, the light emitted by the light source 2 can be better converged by the second plano-convex lens 32, improving the light collection rate of the entire lens device 3. Compared with the light collection effect of a single lens, it is greatly improved, and the amount of light loss is significantly reduced to a large extent.

[0033] As Figures 2 to 5 shown, the lens device 3 further includes a lens bracket 33. A receiving cavity 331 is provided inside the lens bracket 33. An installation plate 332 is provided inside the receiving cavity 331. A first installation position 333 is provided on the inner wall of the receiving cavity 331. A second installation position 334 is provided on the installation plate 332. The first installation position 333 is located on one side of the second installation position 334. The lens bracket 33, the installation plate 332, the first installation position 333 and the second installation position 334 are of an integrally formed structure. The first plano-convex lens 31 is provided on the first installation position 333. The second plano-convex lens 32 is provided on the second installation position 334. The light source 2 is located at the tail end of the lens bracket 33. The lens bracket 33 is fixed inside the housing 1.

[0034] The first installation position 333 is an installation step. A through hole 3321 is provided on the installation plate 332. The through hole 3321 forms the second installation position 334. The aperture of the first installation position 333 is larger than the aperture of the second installation position 334.

[0035] When installing the second plano-convex lens 32, the second plano-convex lens 32 can be installed facing the through hole 3321. The position of the installation plate 332 around the through hole 3321 is used to limit the periphery of the second plano-convex lens 32, which is convenient for the installation of the second plano-convex lens 32 on the second installation position 334. When installing the first plano-convex lens 31, the first plano-convex lens 31 is located inside the receiving cavity 331. The periphery of the first plano-convex lens 31 is limited by the first installation position 333, which is convenient for the installation of the first plano-convex lens 31 on the first installation position 333.

[0036] Limit buckles 337 are provided on the installation plate 332. The limit buckles 337 are located on the outer periphery of the second installation position 334.

[0037] A vertical edge 34 is formed on the outer periphery of the second installation position 334. The vertical edge 34 is perpendicular to the installation plate 332. The limit buckles 337 are located between adjacent vertical edges 34. The width of the limit buckles 337 is smaller than the width of the vertical edge 34. When the second plano-convex lens 32 is installed at the second installation position 334, the vertical edge 34 can play a certain role in limiting and fixing the periphery of the second plano-convex lens 32; the limit buckles 337 are pressed and inclined towards the through hole 3321 side, which can press the second plano-convex lens 32 to prevent the second plano-convex lens 32 from falling off after installation.

[0038] During actual use, the limit buckle 337 can be of other shapes, and it can press the second plano-convex lens 32 toward the side of the through hole 3321 to fix the second plano-convex lens 32.

[0039] Thus, the second plano-convex lens 32 is fixed mechanically, which is simple and convenient, with quick installation. It eliminates the need to seal the second plano-convex lens 32 on the bracket with high-temperature sealant and the gluing process. Since the second plano-convex lens 32 works at high temperature for a long time, when using sealant, the glue is prone to aging and falling off, which seriously affects the service life of the equipment. Therefore, adopting the mechanical fixing method with the limit buckle 337 greatly reduces this risk, indirectly saves the use of high-temperature glue, and reduces production costs.

[0040] A first fixing hole 338 is provided on the side wall of the lens bracket 33. The first fixing hole 338 is located on the front side of the first installation position 333, and the first installation position 333 is located between the first fixing hole 338 and the second installation position 334. Therefore, when the first plano-convex lens 31 is installed in place on the first installation position 333, after the external positioning screw penetrates through the first fixing hole 338, it presses the front end face of the first plano-convex lens 31, so that the first plano-convex lens 31 is fixed under the combined action of the positioning screw and the first installation position 333. Among them, there are at least two first fixing holes 338, which can be three or more, and can be increased or decreased according to specific requirements. The first fixing holes 338 are evenly distributed on the side wall of the lens bracket 33. Therefore, by using a relatively small locking force, larger optical devices such as the first plano-convex lens 31 can be positioned and locked, and it can prevent the position change of larger-mass devices such as the first plano-convex lens 31 during use, making the lens not easy to loosen and slip, thus ensuring that the optical path relationship of the parts during the period remains determined, greatly improving the performance reliability, saving the use and process of high-temperature adhesive, shortening the production cycle, and relatively simplifying the overall installation process and efficiency.

[0041] During actual use, when the lens bracket 33 is molded, the distance between the first installation position and the second installation position can be adjusted accordingly, so as to adjust the distance between the two lenses to meet different optical path use requirements. The two lenses in the lens bracket 33 are both fixed by mechanical structures, which is convenient for taking out and replacing the corresponding lenses.

[0042] On the other side of the mounting plate 332, there is a reflecting cup 335. A light through hole 336 is provided on the reflecting cup 335. The light through hole 336 corresponds to the second plano-convex lens 32, and the light source 2 is installed at the light through hole 336. Among them, the reflecting cup 335 and the mounting plate 332 are an integrally formed structure. In order to improve the light condensing effect of the reflecting cup 335, the reflecting cup 335 is conical. The size of the reflecting cup 335 can be increased or decreased accordingly according to the size or power of the actual light-emitting lamp group, etc.

[0043] In actual use, a reflective cup made of other materials with higher reflectivity can be installed on the inner side of the reflective cup 335. The upper edge of the reflective cup can be located at the second installation position. The reflective cup can be pressed tightly by the second plano-convex mirror 32 during installation, thereby further improving the projection utilization rate, light collection rate and reflectivity.

[0044] By providing a reflective cup 335, the large end of the reflective cup 335 is close to the through hole 3321, and the external light-emitting lamp group is installed on the outside of the small end of the reflective cup 335. The light passes through the light hole 181 and can be converged by the reflective cup 335 to improve the light collection rate, and then emitted through the lens to meet the use requirements.

[0045] The mounting plate 332 is provided with a second fixing hole 35. Through the second fixing hole 35, it is convenient to pass an external fixing screw through the second fixing hole 35 and then lock and fix it with other structures, thereby facilitating the installation of the entire lens bracket.

[0046] When the light-emitting lamp group on one side of the reflective cup 335 needs to be replaced with a light-emitting device of different specifications or power, since the two lenses in the lens holder 33 are fixed by a mechanical structure, after loosening the corresponding screws or structures, taking out the lenses, and taking out the fixing screws at the second fixing hole 35, the lens holder 33 can be taken out to facilitate replacement of related parts.

[0047] A wire outlet hole 36 is provided on one side of the bottom end of the lens bracket 33. Therefore, the wire outlet hole 36 is provided to facilitate the light-emitting element to be led out through the wire outlet hole 36 when wiring, play a guiding role, facilitate the routing of the wire, avoid the mess of the wire, and improve the simplicity.

[0048] like Figure 2 , Figures 6 to 12 As shown, the LCD module 4 includes a front cover 41, a rear cover 42, a sealing glass 43, an LCD screen 44 and a sealing gasket 45. The front cover 41 and the rear cover 42 are matched. The sealing glass 43 is two pieces, and the two sealing glasses 43 are fixed on the front cover 41 and the rear cover 42 respectively. The LCD screen 44 is arranged between the front cover 41 and the rear cover 42. A cooling cavity 46 is formed between the front cover 41 and the rear cover 42. The LCD screen 44 is located in the cooling cavity 46. The sealing gasket 45 is clamped between the front cover 41 and the rear cover 42. A pressure relief liquid capsule 451 is arranged on the sealing gasket 45. The pressure relief liquid capsule 451 is connected to the cooling cavity 46. The cooling cavity 46 is loaded with cooling liquid. The front cover 41 and the rear cover 42 are fixed in the housing 1, and the front cover 41 is located on the side away from the lens device 3. Among them, the cooling liquid is an existing transparent cooling oil, which does not affect the light transmission effect of the LCD screen 44. The front cover 41 and the rear cover 42 can be made of existing alloy metals with high thermal conductivity and strong rigidity, which can quickly conduct the heat of the coolant and increase the cooling speed of the entire coolant, thereby preventing the entire LCD module 4 from overheating during use.

[0049] When the LCD screen 44 is installed, the bottom of the frame of the LCD screen 44 can be adhesively fixed to the inner side of the front cover 41 or the rear cover 42, and then the gasket 45 is placed at the mating contact of the front cover 41 and the rear cover 42, and the front cover 41 and the rear cover 42 are locked and fixed by screws. A receiving cavity is formed between the front cover 41 and the rear cover 42, which facilitates the installation of the LCD screen 44 and the distribution of the cooling cavity 46. The gasket 45 seals the coolant in the cooling cavity 46 to prevent the coolant from leaking out.

[0050] During actual use, in order for the coolant to better take away the heat on the LCD screen 44, the width of the LCD screen 44 is less than the width of the receiving cavity, so that both the left and right sides of the LCD screen 44 are also located in the coolant, that is, the entire LCD screen 44 is immersed in the coolant. Thus, through the coolant on the entire outer periphery of the LCD screen 44, a large amount of heat accumulated on the surface of the LCD screen can be exported, conducted to the front cover 41 and the rear cover 42, and then dissipated through the front cover 41 and the rear cover 42. In order to improve the heat dissipation efficiency of the front cover 41 and the rear cover 42, the front cover 41 and the rear cover 42 are made of metal materials to improve the heat conduction efficiency and facilitate the rapid dissipation of heat; and a cooling fan or an external cooling pipe can be installed on the outer side of the entire module to facilitate the rapid removal of the heat of the module.

[0051] Through the cooling effect of the coolant in the cooling cavity 46, the heat of the LCD screen 44 can be taken away in time, so that the LCD screen can be within the normal working temperature range, and the operating temperature does not exceed 70°C, which improves the service life of the LCD screen. Among them, the shapes of the front cover, the rear cover, the LCD screen, etc. can be adjusted according to actual use requirements, and can be square, circular, polygonal or other shapes to meet the requirements of different use scenarios.

[0052] When the front cover 41 and the rear cover 42 are assembled, they are locked and fixed at the four top corners by the sealing screws 49; in order to ensure the sealing effect when the front cover and the rear cover are mated, a sealing rubber ring 30 is installed at the lid mating part on the corresponding side of the sealing screw 49 to ensure the corresponding sealing effect.

[0053] A receiving groove 47 is provided on the inner side of the front cover 41 and / or the rear cover 42, and the pressure relief bladder 451 is located in the receiving groove 47. The receiving groove 47 can be opened on the inner side of the front cover 41 or the rear cover 42, below the LCD screen 44, or can be opened on both the front cover 41 and the rear cover 42 to facilitate the placement and installation of the pressure relief bladder 451. Among them, in order to ensure that the pressure relief bladder 451 has enough expansion space when the coolant expands due to heat, the length and width of the receiving groove 47 are correspondingly larger than the length and width of the pressure relief bladder 451.

[0054] The gasket 45 is clamped at the peripheral mating part of the front cover 41 and the rear cover 42, and the pressure relief liquid bladder 451 and the gasket 45 are of an integrally formed structure. Among them, the gasket 45 is made of rubber material, and the pressure relief liquid bladder 451 has a certain elasticity to meet the deformation requirements of the pressure relief liquid bladder 451 under hydraulic action.

[0055] The LCD screen 44 generates heat during operation, and the coolant in the cooling cavity takes away the heat. The temperature of the coolant rises due to heat, and the coolant expands to a certain extent under the action of thermal expansion and contraction. When the coolant expands, the pressure relief liquid bladder 451 is forced to expand outward, facilitating the flow of the coolant to the pressure relief liquid bladder 451 after thermal expansion, avoiding excessive hydraulic pressure in the cooling cavity 46 and preventing leakage caused by excessive coolant pressure.

[0056] An opening 452 is provided on one side of the pressure relief liquid bladder 451, and the opening 452 is communicated with the cooling cavity 46. The opening 452 of the pressure relief liquid bladder 451 is communicated with the cooling cavity, making the coolant in the entire module in a sealed state. A communication hole 48 is provided at the bottom of the front cover 41 or the rear cover 42, and the communication hole 48 is communicated with the cooling cavity 46, and the communication hole 48 is communicated with the opening 452.

[0057] When the opening 452 is located on the side close to the front cover 41, the communication hole 48 is located on the front cover 41.

[0058] When the opening 452 is located on the side close to the rear cover 42, the communication hole 48 is located on the rear cover 42.

[0059] Now, taking the example where the opening 452 is opened on the side close to the front cover 41, the opening of the pressure relief liquid bladder 451 faces the side wall of the front cover 41, so that a sac-like space is formed between the side wall of the front cover 41 and the pressure relief liquid bladder 451. Therefore, when the coolant in the cooling cavity expands due to heat, under hydraulic action, the pressure relief liquid bladder 451 is squeezed, and the pressure relief liquid bladder 451 can expand outward, facilitating the flow of the coolant through the communication hole 48 into the pressure relief liquid bladder 451 to achieve pressure relief and avoid leakage of the coolant caused by excessive hydraulic pressure in the entire cooling cavity. Conversely, when the coolant cools down, the pressure on the pressure relief liquid bladder 451 gradually decreases, so the pressure relief liquid bladder 451 gradually retracts, preventing air from infiltrating from the outside to the inside and causing bubbles in the coolant, and ensuring the light transmission effect of the LCD screen.

[0060] Among them, there can be one or more communication holes 48, which facilitate the coolant in the cooling cavity 46 to enter the pressure relief liquid bladder 451, or the coolant in the pressure relief liquid bladder 451 to enter the cooling cavity through the communication hole 48, facilitating the flow of the coolant during expansion or contraction. During actual use, the size of the opening can be adjusted accordingly and can be reduced to the size of a hole.

[0061] During actual use, in order to ensure that the pressure relief bladder 451 can expand and contract normally within the receiving groove 47, a through hole 20 is provided on the side of the receiving groove 47 facing away from the opening 452. The through hole 20 penetrates the corresponding side of the cover body and is connected to the external atmosphere. The through hole 20 does not affect the sealing effect of the pressure relief bladder 451. By providing the through hole 20, the receiving groove 47 is connected to the external atmosphere, so that the air pressure inside the receiving groove 47 is kept consistent with the external atmospheric pressure. Therefore, under the action of hydraulic pressure and air pressure, the pressure relief bladder 451 can expand when heated and contract when cooled normally. Among them, the through hole 20 can be a circular through hole or a square through hole. While ensuring the connection between the receiving groove 47 and the outside, it can effectively prevent strong light from directly shining on the surface of the pressure relief bladder 451 and avoid local accelerated aging of the pressure relief bladder 451.

[0062] Clamping grooves 10 are provided on both the front cover 41 and the rear cover 42, and the sealing gasket 45 is snapped into the clamping grooves 10. Thus, through the clamping grooves 10, the sealing gasket 45 can be pressed tightly between the front cover 41 and the rear cover 42, and the sealing effect of the sealing gasket 45 is increased.

[0063] First convex ribs 453 and second convex ribs 454 are respectively provided on both sides of the sealing gasket 45. The first convex ribs 453 and the second convex ribs 454 are both clamped between the front cover 41 and the rear cover 42 and are located outside the clamping grooves 10.

[0064] Convex ribs 455 are provided on the other two sides of the sealing gasket 45, and the convex ribs 455 are in contact with the corresponding clamping grooves 10.

[0065] Among them, the sealing gasket 45, the first convex ribs 453, the second convex ribs 454 and the convex ribs 455 are of an integrally injection-molded structure; through the first convex ribs 453 and the second convex ribs 454, the contact area between the sealing gasket 45 and the front and rear covers can be increased, thereby improving the sealing performance; by providing the convex ribs 455, the sealing pressure can be locally increased, so that the overall sealing performance of the sealing gasket is improved. Through the cooperation of the various structures of the sealing gasket 45 with the front and rear covers, the quick positioning and installation of the sealing gasket are facilitated. The installation is simple and convenient, saving the bonding and fixing of the sealing ring to the front and rear covers, saving the use and coating process of the high-temperature sealant, indirectly saving the use and process of the high-temperature glue, and reducing the production cost.

[0066] A first installation groove 411 is provided on the inner side of the front cover 41, and a second installation groove 421 is provided on the inner side of the rear cover 42. One of the sealing glasses 43 is fixed in the first installation groove 411, and the other sealing glass 43 is fixed in the second installation groove 421. Among them, the sizes of the first installation groove 411 and the second installation groove 421 are respectively consistent with the sizes of the corresponding sealing glasses, facilitating the snap-in installation of the sealing glasses; in order to improve the stability of the installation of the sealing glass 43, each sealing glass and the corresponding installation groove are fixed by high-temperature sealant, playing a sealing role and ensuring the stability of the bonding of the sealing glass.

[0067] The projection optical path structure of the present invention further includes a heat-insulating glass plate 5 and a rear Fresnel lens 6. The heat-insulating glass plate 5 is located between the lens device 3 and the LCD module 4, and the rear Fresnel lens 6 is located on the front side of the LCD module 4. Therefore, the light transmitted through the lens device 3 acts on the LCD module 4 after passing through the heat-insulating glass plate 5. By means of the heat-insulating glass plate 5, the uniformity of the projected light can be improved; the light emitted from the LCD module 4 is emitted after passing through the rear Fresnel lens 6. Through the action of the rear Fresnel lens 6, the light can be focused again and transmitted outward, so that the brightness and stability of the final image are improved.

[0068] The projection optical path structure further includes a control main board 7. The control main board 7 is arranged outside the housing 1, and the control main board 7 is electrically connected to the light source 2 through a wire. Therefore, during use, the on / off state of the light source 2 can be controlled through the control main board 7.

[0069] The projection optical path structure of the present invention further includes a cooling pipe 8 and a cooling fan 9. The cooling pipe 8 is located outside the front cover 41 and the rear cover 42 and is in contact with the front cover 41 and the rear cover 42. The cooling pipe 8 extends to the outside of the housing 1. The cooling fan 9 is fixed outside the housing 1 and is arranged opposite to the cooling pipe 8. After the front cover 41 and the rear cover 42 are connected by screws, the cooling pipe can be connected to the screws connecting the two, facilitating the heat to reach the cooling pipe. External coolant can be passed through the cooling pipe, and the heat on the front cover 41 and the rear cover 42 can be quickly taken away by the external coolant, thereby improving the heat dissipation efficiency of the front and rear covers and making the overall heat dissipation effect better. During actual use, in order to better improve the heat dissipation speed of the front cover 41 and the rear cover 42, a cooling fan 9 can be installed on the outside to improve the heat dissipation efficiency of the front and rear covers.

[0070] In the LCD module, by immersing the LCD screen 44 in the coolant, the heat on the entire LCD screen 44 can be taken away in time by the coolant; the coolant uses the existing highly transparent coolant for cooling the display screen, so that for the entire module, except for the LCD screen, the visible light transmittance measurement and calculation of the entire structural frame can reach 88.3-95.5%, thus not affecting the use of the entire module.

[0071] To facilitate the installation and fixation of various structures inside the housing 1, the main body of the housing 1 is U-shaped, and a top cover is provided at the top. The control main board 7 is locked and fixed above the top cover by screws. Among them, the shape of the housing 1 can be adjusted accordingly according to the actual shapes of the lens device 3 and the LCD module 4 to meet the requirements of different scenarios. An arc-shaped groove is formed inside the housing 1, and the arc-shaped groove matches the outer shape of the lens bracket 33 of the lens device 3, so as to facilitate the quick positioning and installation of the lens bracket 33 inside the housing 1. A groove 11 is formed at the bottom of the housing 1. After the front cover 41 and the rear cover 42 of the LCD module 4 are assembled, the bottom can be snapped into the groove 11, and the LCD module 4 can be quickly positioned through the groove 11. At the same time, corresponding clamping grooves can be formed on the inner wall of the housing 1, and the heat insulation glass plate 5 and the rear Fresnel lens 6 are respectively placed in the corresponding clamping grooves to achieve installation and fixation. Finally, the top cover is covered and fixed, and the fixation of various structures inside the housing 1 is realized.

[0072] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Projection optical path structure, characterized in that, It includes a housing (1), a light source (2), a lens device (3), and an LCD module (4). The lens device (3) and the LCD module (4) are both provided inside the housing (1). The light source (2) and the LCD module (4) are respectively located on both sides of the lens device (3). The lens device (3) includes a first plano-convex lens (31) and a second plano-convex lens (32) arranged in parallel. The outer diameter of the first plano-convex lens (31) is larger than that of the second plano-convex lens (32). The second plano-convex lens (32) is located between the first plano-convex lens (31) and the light source (2). The second plano-convex lens (32) bulges towards the first plano-convex lens (31) side, and the first plano-convex lens (31) bulges towards the LCD module (4) side. A groove (11) is formed at the bottom of the housing (1), and the bottom of the LCD module (4) is matched with the groove (11). The LCD module (4) includes a front cover (41), a rear cover (42), a sealing glass (43), an LCD screen (44), and a gasket (45). The front cover (41) is matched with the rear cover (42). There are two pieces of sealing glass (43), and the two pieces of sealing glass (43) are respectively fixed on the front cover (41) and the rear cover (42). The LCD screen (44) is arranged between the front cover (41) and the rear cover (42). A cooling cavity (46) is formed between the front cover (41) and the rear cover (42). The LCD screen (44) is located inside the cooling cavity (46). The gasket (45) is clamped between the front cover (41) and the rear cover (42). A pressure relief bladder (451) is provided on the gasket (45). The pressure relief bladder (451) is communicated with the cooling cavity (46). The cooling cavity (46) is filled with a coolant. The front cover (41) and the rear cover (42) are fixed inside the housing (1), and the front cover (41) is located on the side away from the lens device (3). When the LCD screen (44) is installed, the bottom of the frame of the LCD screen (44) is adhesively fixed to the inner side of the front cover (41) or the rear cover (42). The gasket (45) is placed at the mating contact of the front cover (41) and the rear cover (42), and the front cover (41) and the rear cover (42) are locked and fixed by screws. A receiving groove (47) is provided on the inner side of the front cover (41) and / or the rear cover (42), and the pressure relief bladder (451) is located inside the receiving groove (47). The gasket (45) is clamped at the peripheral mating part of the front cover (41) and the rear cover (42), and the pressure relief bladder (451) and the gasket (45) are of an integrally formed structure. An opening (452) is provided on one side of the pressure relief bladder (451). The opening (452) is communicated with the cooling cavity (46). A communication hole (48) is provided at the bottom of the front cover (41) or the rear cover (42). The communication hole (48) is communicated with the cooling cavity (46), and the communication hole (48) is communicated with the opening (452). When the opening (452) is located on the side close to the front cover (41), the communication hole (48) is located on the front cover (41). When the opening (452) is located close to the side of the rear cover (42), the communication hole (48) is located on the rear cover (42). A through hole (20) is provided on the side of the receiving groove (47) facing away from the opening (452). The through hole (20) penetrates the corresponding side of the cover body and is in communication with the external atmosphere.

2. The projection optical path structure according to claim 1, wherein The lens device (3) further includes a lens bracket (33). An accommodation cavity (331) is provided inside the lens bracket (33). An installation plate (332) is provided inside the accommodation cavity (331). A first installation position (333) is provided on the inner wall of the accommodation cavity (331). A second installation position (334) is provided on the installation plate (332). The first installation position (333) is located on one side of the second installation position (334). The lens bracket (33), the installation plate (332), the first installation position (333) and the second installation position (334) are of an integrally formed structure. The first plano-convex lens (31) is provided on the first installation position (333). The second plano-convex lens (32) is provided on the second installation position (334). The light source (2) is located at the tail end of the lens bracket (33). The lens bracket (33) is fixed inside the housing (1).

3. The projection optical path structure according to claim 2, characterized in that On the other side of the installation plate (332), there is a reflector cup (335). A light passing hole (336) is provided on the reflector cup (335). The light passing hole (336) corresponds to the second plano-convex lens (32). The light source (2) is installed at the light passing hole (336).

4. The projection optical path structure according to any one of claims 1 to 3, characterized in that, It further includes a heat-insulating glass plate (5) and a rear Fresnel lens (6). The heat-insulating glass plate (5) is located between the lens device (3) and the LCD module (4). The rear Fresnel lens (6) is located on the front side of the LCD module (4).

5. The projection optical path structure according to claim 4, wherein It further includes a control main board (7). The control main board (7) is provided on the outer side of the housing (1). The control main board (7) is electrically connected to the light source (2).

6. The projection optical path structure according to claim 1, characterized in that, It further includes a cooling pipe (8) and a cooling fan (9). The cooling pipe (8) is located on the outer sides of the front cover (41) and the rear cover (42) and is in contact with the front cover (41) and the rear cover (42). The cooling pipe (8) extends to the outer side of the housing (1). The cooling fan (9) is fixed on the outer side of the housing (1) and is arranged opposite to the cooling pipe (8).

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