Projection equipment and projection system

Abstract

The utility model discloses projection equipment and a projection system, and the projection equipment comprises a housing which is provided with a first opening, and the housing and the first opening form a cavity together; the imaging assembly is arranged in the cavity so as to divide the cavity into a first cavity and a second cavity, a communication port for communicating the first cavity with the second cavity is formed between the imaging assembly and the shell, and the first cavity is communicated with the first opening; the lens assembly is arranged at the first opening; the light source assembly is arranged in the second cavity; the first fan is arranged in the second cavity and used for driving air in the cavity to flow, and the opening and closing assembly is arranged at the communicating opening in an opening and closing mode and used for closing and opening the communicating opening. When the lens assembly fogs, the opening and closing assembly can open the communication port, and the temperature of the lens assembly and the temperature of the first cavity are balanced rapidly, so that the elimination rate of water mist on the lens assembly can be improved, and the projection effect of the projection equipment is improved.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of projection equipment, and in particular, relates to a projection equipment and a projection system. Background Art

[0002] In projection equipment, due to temperature differences and other reasons, the lens assembly is prone to produce water mist which is difficult to dissipate quickly, resulting in poor projection effect of the projection equipment.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The present disclosure aims to at least to some extent solve the technical problem that water mist on a lens assembly of a projection device affects the projection effect. To this end, the present disclosure provides a projection device and a projection system.

[0005] An embodiment of the present disclosure provides a projection device, the projection device comprising:

[0006] A shell, wherein the shell has a first opening, and the shell and the first opening together form a cavity;

[0007] An imaging component, the imaging component is arranged in the cavity to separate the cavity into a first cavity and a second cavity, a communication port connecting the first cavity and the second cavity is provided between the imaging component and the housing, and the first cavity is connected to the first opening;

[0008] a lens assembly, wherein the lens assembly is disposed at the first opening;

[0009] a light source assembly, wherein the light source assembly is disposed in the second cavity;

[0010] a first fan, the first fan being disposed in the second cavity, the first fan being used to drive air flow in the cavity, and

[0011] An opening and closing component is disposed at the communication port in an opening and closing manner, and is used to close and open the communication port.

[0012] In some embodiments, the communication port is located on a side of the imaging assembly adjacent to the lens assembly.

[0013] In some embodiments, the opening and closing assembly includes:

[0014] a support rod, the support rod comprising a first end and a second end opposite to each other, the first end and the second end being disposed on the housing; and,

[0015] A baffle, the baffle being arranged on the support rod;

[0016] In which, the support rod is rotatably disposed on the shell or the baffle is rotatably disposed on the support rod, and when the connecting port is closed, the ends of the baffle are respectively docked or overlapped with the shell and the imaging component, and when the connecting port is opened, at least the end of the baffle is separated from the imaging component.

[0017] In some embodiments, when the communication port is opened, the blocking piece may be rotated to fit with the housing.

[0018] In some embodiments, the opening and closing assembly further comprises:

[0019] A driving member, when the support rod is rotatably disposed on the shell, the driving member is connected to the support rod, and the driving member is used to drive the support rod to rotate; or, when the baffle is rotatably disposed on the support rod, the driving member is used to drive the baffle to rotate.

[0020] In some embodiments, the driving member is a motor, which is connected to the support rod and is used to drive the support rod to rotate; or, the driving member is an electromagnetic switch, which is used to magnetically attract the baffle to rotate the baffle.

[0021] In some embodiments, the blocking piece includes at least two split blocking pieces, the opening and closing assembly includes electromagnetic switches of a number corresponding to the split blocking pieces, and the electromagnetic switches and the split blocking pieces are arranged on the housing in a one-to-one correspondence.

[0022] In some embodiments, the opening and closing assembly further comprises:

[0023] A transmission member, the transmission member is connected to the transmission member, and the transmission member is also connected to the support rod or the baffle.

[0024] In some embodiments, the driving member is disposed in the cavity.

[0025] In some embodiments, the first end extends outside the cavity, the driving member is disposed outside the cavity, and the driving member is connected to the first end.

[0026] In some embodiments, the projection device further comprises:

[0027] A water mist detection component is used to detect the water mist state of the lens assembly, and the water mist detection component is electrically connected to the driving member.

[0028] In some embodiments, the water mist detection assembly includes:

[0029] a temperature and humidity sensor, the temperature and humidity sensor being disposed in the first cavity; and / or,

[0030] A water mist detection camera is arranged on the inside of the shell or the outside of the shell, and the shooting range of the water mist detection camera covers the lens assembly.

[0031] In some embodiments, the first end extends to the outside of the shell and is provided with a rotating handle, or the second end extends to the outside of the shell and is provided with a rotating handle.

[0032] In some embodiments, sealing rings are respectively provided at the rotational connections between the first end and the second end and the housing.

[0033] In some embodiments, a sealing gasket and / or a sealing matching structure is provided at the joint of the projection device.

[0034] In some embodiments, the shell is provided with a ventilation hole connected to the first cavity and / or the second cavity, and a dustproof net and a waterproof breathable membrane are provided at the ventilation hole.

[0035] In some embodiments, the dustproof net and the waterproof breathable membrane are both black.

[0036] In some embodiments, the lens assembly includes an inner lens and an outer lens, the inner lens is located in the first cavity, the outer lens is located outside the cavity, and the inner lens and / or the outer lens are provided with a waterproof coating.

[0037] In some embodiments, the lens assembly further includes a lens barrel, the inner lens and the outer lens are respectively disposed at opposite ends of the lens barrel, and the lens barrel is filled with an inert gas.

[0038] The embodiment of the present disclosure further provides a projection system, which includes a projection screen and the above-mentioned projection device, wherein the projection screen is used to receive a projection image of the projection device.

[0039] The embodiments of the present disclosure have at least the following beneficial effects:

[0040] The above-mentioned projection device is provided with an opening and closing component at the connecting port. When the lens assembly is fogged, the opening and closing component can open the connecting port to connect the first cavity with the second cavity, so that the first fan can drive air to flow in the first cavity and the second cavity, thereby increasing the air flow speed in the first cavity, and can bring part of the heat in the second cavity to the first cavity, thereby increasing the air flow speed and temperature at the lens assembly in the first cavity, and can quickly balance the temperature of the lens assembly and the first cavity, so as to quickly eliminate the temperature difference between the lens assembly and the first cavity, thereby increasing the rate of eliminating water mist on the lens assembly, and further improving the projection effect of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A diagram showing a process of eliminating water mist at a lens of a projection device in the related art is shown;

[0043] Figure 2 A front view of a projection device in an embodiment of the present disclosure is shown;

[0044] Figure 3 Shows Figure 2 A perspective view of the projection device;

[0045] Figure 4 Shows Figure 2 A perspective view of the projection device from another angle;

[0046] Figure 5 Shows Figure 4 A schematic diagram of the local structure of the opening and closing components in the projection device;

[0047] Figure 6 Shows Figure 5 A schematic diagram of the three-dimensional structure of the middle opening and closing component;

[0048] Figure 7 Shows Figure 2 A perspective view of the projection device from another angle;

[0049] Figure 8 Shows Figure 7 A schematic diagram of the local structure of the driving part in the projection device;

[0050] Fig. 9 A schematic diagram of a partial structure of the other end of the opening and closing assembly in the projection device opposite to the driving member is shown;

[0051] Fig.10 Shows Figure 2 A perspective view of the opening and closing assembly of the projection device when the communication port is closed;

[0052] Fig.11 Shows Fig.10 Schematic diagram of the air duct of the projection equipment;

[0053] Fig.12 Shows Fig.10 A partial schematic diagram of the opening and closing component of the projection device when the communication port is closed;

[0054] Fig.13 Shows Figure 2 A perspective view of the opening and closing component of the projection device when the communication port is opened;

[0055] Fig.14 Shows Fig.13 Schematic diagram of the air duct of the projection equipment;

[0056] Fig.15 Shows Fig.13 A partial schematic diagram of the opening and closing component of the projection device when the connecting port is opened;

[0057] Fig.16 Shows Figure 4 A schematic diagram of the three-dimensional structure of the second radiator in the projection device;

[0058] Fig.17 Shows Figure 4 A schematic diagram of the three-dimensional structure of the optical device in the projection device;

[0059] Fig.18 Shows Figure 4 A schematic diagram of the local structure of the joint in the projection device;

[0060] Fig.19 Shows Figure 4 Schematic diagram of the sealing stop structure at the joint of the projection device;

[0061] Fig. 20 Shows Figure 4 Schematic diagram of the sealing anti-stop structure at the joint of the projection device;

[0062] Fig.21 Shows Figure 4 A partial cross-sectional view of a driving member in a projection device;

[0063] Fig. 22 Shows Figure 4 A partial cross-sectional view of a lens assembly in a projection device;

[0064] Fig.23The diagram shows the demisting effect of the projection device after being provided with an opening and closing component to improve the internal circulation air duct in the embodiment of the present disclosure.

[0065] Reference numerals:

[0066] 100, housing; 110, first opening; 120, communication port; 130, sealing pad; 140, sealing matching structure; 141, sealing stopper; 142, sealing counter-stopper; 150, ventilation hole; 160, first heat sink; 170, first reflector; 180, second reflector; 200, imaging assembly; 210, first Fresnel lens; 220, heat-insulating transparent body; 230, display panel; 240, second Fresnel lens; 300, lens assembly; 310, inner lens; 320, outer lens; 400, light source assembly; 500, first fan; 600, opening and closing assembly Part; 610, support rod; 611, first end; 612, second end; 613, rotating handle; 614, sealing ring; 615, end fixing part; 620, baffle; 630, driving part; 631, driving fixing part; 640, transmission part; 800, second radiator; 810, heat pipe; 820, heat conduction plate; 900, second fan; 1000, control module; Q100, cavity; Q110, first cavity; Q120, second cavity; F100, internal circulation air duct; F110, first internal circulation air duct; F120, second internal circulation air duct; F200, external air duct. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0068] In addition, the present disclosure may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0069] The present disclosure is described below with reference to specific embodiments and in conjunction with the accompanying drawings:

[0070] It should be noted that the directional terms "up, down, front, back (back), horizontal, vertical" in the present disclosure, unless otherwise specified, are all relative concepts, not absolute concepts. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0071] For the sake of convenience and brevity, this disclosure uses the normal working position of the optical machine as a reference, that is, the side of the optical machine facing the projected image (such as a projection screen) is called the front side or the front; the rear side or the rear refers to the side of the optical machine facing away from the projected image, and the left side and the right side are lateral directions perpendicular to the front side and the rear side. The upper side and the lower side are directions perpendicular to the front side and the rear side, as well as the left side and the right side. Fig.10 For example, the lens assembly 300 is located in front of the second reflector 180 and above the second fan 900 .

[0072] With the upgrading and development of liquid crystal display (LCD) technology, the market demand for LCD projection devices has been activated. In projection devices, the optical machine is an important component, and the optical device and heat dissipation device of the projection device are integrated in the optical machine. There are two types of optical machines: open optical machines and closed optical machines. The optical devices of the open optical machine have no dust protection. After long-term use, the dust and water resistance performance is poor, which affects the projection effect and service life, resulting in a short life of the open optical machine and low market recognition; the closed optical machine is provided with a closed shell 100 to protect the optical device from dust, and the projection effect and service life can be improved to a certain extent, but its closed cavity Q100 structure makes it difficult for the optical machine cavity Q100 to quickly exchange temperature and humidity with the outside world. When the temperature and humidity difference between the inside and outside of the optical machine cavity Q100 is large, water mist is easily generated on the lens and is difficult to dissipate quickly, resulting in blurred images of the closed optical machine projection and unable to display the images normally, and poor projection effect, affecting the user experience.

[0073] In the related art, the lens on the end face of the lens assembly 300 of the projection device is made of glass lens. Even if some models use some resin lenses, in order to avoid coating shedding and reliability issues, the lens on the end face of the lens assembly 300 still needs to use glass lens. The surface of the glass lens heats up slowly. If the temperature inside the cavity Q100 of the projection device rises quickly, and the temperature difference between the glass lens of the lens assembly 300 and the surrounding environment is large, water vapor condenses on the glass lens to produce water mist defects. After the projection device is lit, the heating rate inside the optical machine cavity Q100 is much higher than the heating rate of the glass lens of the lens assembly 300. The temperature difference causes water vapor to condense on the inner lens 310 of the lens assembly 300, and a fog surface is produced on the inner lens 310. After the temperature inside the lens assembly 300 gradually rises, the water mist will gradually disappear.

[0074] In addition, the circulation direction of the liquid and / or gas used for cooling in the heat pipe 810 of the radiator in the projection device is the same as the direction of gravity. When the projection device is mounted upside down on the ceiling, the circulation in the heat pipe 810 becomes inverse gravity, resulting in a reduction in the heat dissipation capacity of the radiator, which in turn causes the temperature difference threshold for fogging of the projection device to become lower, causing the lens of the projection device to be more susceptible to environmental influences and fogging.

[0075] For example, when the environment inside and outside the cavity Q100 of the projection device changes significantly, such as when it is moved indoors after being placed outdoors for a period of time (for transportation, storage, etc.), the overall temperature of the projection device approaches the outdoor temperature before it is turned on. When the projection device is turned on, the light source assembly 400 and the imaging assembly 200 in the projection device will generate a certain amount of heat, and there will be a large temperature difference between the cavity Q100 of the projection device and the outside of the cavity Q100; or, when the cold air conditioner is turned on indoors, the projection device is close to the cold air conditioner, which can easily lead to a large temperature difference between the cavity Q100 and the outside of the cavity Q100. Due to the temperature difference, water vapor will be generated in the cavity Q100. When the water vapor circulates to the lens in the cavity Q100, the temperature of the lens is lower than that of other positions in the cavity Q100, causing the water vapor to condense at the lens, forming water mist on the lens that is difficult to dissipate quickly, resulting in blurred projected images that cannot be displayed normally, and poor projection effects.

[0076] In order to solve the lens fogging problem, the present disclosure uses a 4.45-inch projection device for testing. First, the projection device is stored in a low-temperature box to simulate the outdoor transportation and storage environment. When the temperature inside the cavity Q100 of the projection device is more than 13°C different from the room temperature, it is taken out of the low-temperature box and then turned on. Within 2 minutes of turning on, water mist is generated inside the lens 310. Figure 1 As shown, the lens mist change process of the projection device from 2 minutes to 25 minutes after it is turned on is shown. The mist will gradually disappear after the projection device is continuously lit for 20 minutes to 25 minutes.

[0077] In view of the problem that the lens assembly 300 of the projection device is prone to generate water mist and is difficult to dissipate quickly, the embodiment of the present disclosure provides a projection device, such as Figures 2 to 15As shown, the projection device includes a housing 100, an imaging assembly 200, a lens assembly 300, a light source assembly 400, a first fan 500 and an opening and closing assembly 600. The housing 100 has a first opening 110, and the housing 100 and the first opening 110 together form a cavity Q100; the imaging assembly 200 is disposed in the cavity Q100 to separate the cavity Q100 into a first cavity Q110 and a second cavity Q120, and a connection is provided between the imaging assembly 200 and the housing 100 to communicate with the first cavity Q110. The first cavity Q110 is connected to the first opening 110 and the connecting port 120 of the second cavity Q120; the lens assembly 300 is arranged at the first opening 110; the light source assembly 400 is arranged in the second cavity Q120; the first fan 500 is arranged in the second cavity Q120, and the first fan 500 is used to drive the air flow in the cavity Q100; the opening and closing assembly 600 can be opened and closed at the connecting port 120, and the opening and closing assembly 600 is used to close the connecting port 120 and open the connecting port 120.

[0078] The projection device provided in the embodiment of the present disclosure is as follows: Figures 2 to 15 As shown, by arranging an opening and closing component 600 at the connecting port 120, when the lens assembly 300 is fogged, the opening and closing component 600 can open the connecting port 120 to connect the first cavity Q110 with the second cavity Q120, so that the first fan 500 can drive air to flow in the first cavity Q110 and the second cavity Q120, thereby increasing the air flow speed in the first cavity Q110, and can bring part of the heat in the second cavity Q120 to the first cavity Q110, thereby increasing the air flow speed and temperature at the lens assembly 300 in the first cavity Q110, and can quickly balance the temperature of the lens assembly 300 and the first cavity Q110, so as to quickly eliminate the temperature difference between the lens assembly 300 and the first cavity Q110, thereby increasing the rate of eliminating water mist on the lens assembly 300, and thereby improving the projection effect of the projection device.

[0079] The projection device provided in the embodiment of the present disclosure is as follows: Figures 2 to 15As shown, the internal circulation air duct F100 of the cavity Q100 can be adjusted according to environmental changes. When the lens assembly 300 is fogged, the opening and closing assembly 600 can open the connecting port 120, and the first cavity Q110 is connected to the second cavity Q120, so that the first fan 500 can drive the air to flow in the first cavity Q110 and the second cavity Q120. A first internal circulation duct F110 is formed in the first cavity Q110, and the air flow rate in the first cavity Q110 is increased through the first internal circulation duct F110, and part of the heat in the second cavity Q120 can be brought into the first cavity Q110, thereby increasing the air flow rate and temperature at the lens assembly 300 in the first cavity Q110, and quickly balancing the temperature of the lens assembly 300 and the first cavity Q110, so that the temperature difference between the lens assembly 300 and the first cavity Q110 can be eliminated quickly, thereby increasing the rate of eliminating water mist on the lens assembly 300, and further improving the projection effect of the projection device; a second internal circulation duct F120 is formed in the second cavity Q120, and the air flow rate in the second cavity Q120 is increased through the second internal circulation duct F120, thereby ensuring the heat dissipation efficiency of the imaging assembly 200. After the water mist on the lens assembly 300 dissipates, the opening and closing assembly 600 can close the communication port 120 and shorten the inner air duct to the second inner circulation air duct F120 , thereby improving the heat dissipation efficiency of the imaging assembly 200 .

[0080] In some embodiments of the present disclosure, optionally, the shell 100 may include a first shell 100 and a second shell 100, and the first shell 100 and the second shell 100 are respectively located on the left and right sides of the optical machine, and the first shell 100 and the second shell 100 are snapped together to form the shell 100, thereby forming a cavity Q100 in the shell 100.

[0081] In some embodiments of the present disclosure, optionally, some air-guiding structures may be provided on the inner side of the shell 100 to adjust the flow direction of air in the first cavity Q110 and the second cavity Q120, and cooperate with the first fan 500 to form a first internal circulation air duct F110 and a second internal circulation air duct F120 for air to circulate in the cavity Q100.

[0082] In some implementations of the present disclosure, optionally, Figures 2 to 15 As shown, the projection device further includes a base, which is disposed at the bottom of the housing 100 , and a ventilation gap is provided between the base and the bottom of the housing 100 for air circulation and heat dissipation.

[0083] In some implementations of the present disclosure, optionally, Figures 2 to 15 As shown, the projection device further includes a control module 1000 , and the control module 1000 can be disposed in the base.

[0084] In some embodiments of the present disclosure, Figure 7 and Fig.17 As shown, the imaging assembly 200 includes a display panel 230, which may be a liquid crystal display (LCD). The display panel 230 may be detachably disposed in the cavity Q100 through a fixed frame or other structure, or may be detachably disposed in the cavity Q100 through a card slot or other structure on the inner side of the closed housing 100.

[0085] In some embodiments of the present disclosure, Figure 7 and Fig.17 As shown, the imaging assembly 200 further includes a first Fresnel lens 210 and a second Fresnel lens 240, and the first Fresnel lens 210 and the second Fresnel lens 240 are respectively located on both sides of the display panel 230. The first Fresnel lens 210 is located on a side of the display panel 230 adjacent to the light source assembly 400, and is used to adjust the light beam emitted by the light source assembly 400 to parallel light, so as to increase the brightness around the display panel 230, remove the solar photovoltaic effect, and thus improve the uniformity of the display brightness. The second Fresnel lens 240 is located on a side of the display panel 230 away from the light source assembly 400, and is used to focus the light beam emitted by the display panel 230 into the lens assembly 300, so as to improve the clarity of the displayed image. Optionally, the first Fresnel lens 210 and the second Fresnel lens 240 can be detachably disposed in the cavity Q100 through a structure such as a fixing frame, or can be detachably disposed in the cavity Q100 through a structure such as a card slot inside the closed housing 100.

[0086] In some embodiments of the present disclosure, Figure 7 and Fig.17 As shown, the imaging assembly 200 also includes a heat-insulating transparent body 220, which is disposed between the display panel 230 and the light source assembly 400, and is used to insulate the display panel 230 from the light source assembly 400, and prevent the heat generated by the light source assembly 400 from entering the area where the display panel 230 is located, causing the display panel 230 to overheat. The heat-insulating transparent body 220 can be a flat glass, and the light can maintain its original path when passing through the heat-insulating transparent body 220, and will not converge or diverge. Optionally, the heat-insulating transparent body 220 can be detachably disposed in the cavity Q100 through a structure such as a fixing frame, and can also be detachably disposed in the cavity Q100 through a structure such as a card slot on the inner side of the closed shell 100.

[0087] In some embodiments of the present disclosure, Figure 7 and Fig.11As shown, the first Fresnel lens 210, the heat-insulating transparent body 220, the display panel 230 and the second Fresnel lens 240 in the imaging component 200 are sequentially spaced and arranged in the cavity Q100, and there are certain gaps between the first Fresnel lens 210, the heat-insulating transparent body 220, the display panel 230 and the second Fresnel lens 240. When the air circulates in the second internal circulation air duct F120, it can enter these gaps to exchange heat with the display panel 230. That is to say, these gaps can serve as components of the second internal circulation air duct F120.

[0088] In some embodiments of the present disclosure, optionally, Figures 2 to 15 As shown, a first opening 110 communicating with the first cavity Q110 is opened on the front side of the shell 100 , and the lens assembly 300 is disposed at the first opening 110 and is sealed to the shell 100 so that the first cavity Q110 is in a sealed state at the first opening 110 .

[0089] In some embodiments of the present disclosure, optionally, Figures 2 to 15 As shown, the light source assembly 400 may include a base and a light emitting element disposed on the base. The housing 100 may be provided with a second opening connected to the second cavity Q120, the base is disposed at the second opening, and the light emitting element is located in the second cavity Q120. Optionally, an airtight sealing filler such as a sealing gasket 130 is provided between the second opening and the base, so that the second cavity Q120 maintains good sealing, dust can be prevented from entering the second cavity Q120, and the optical device in the second cavity Q120 is kept clean.

[0090] In some embodiments of the present disclosure, the projection device may further include a focusing assembly, which is disposed on the side where the light of the light source assembly 400 is emitted, and the light emitted by the light source assembly 400 is converged or shaped by the focusing assembly, thereby improving the utilization rate of the light emitted by the light source assembly 400 and improving energy efficiency. Optionally, the focusing piece may be a plano-convex lens or a light cup.

[0091] In some embodiments of the present disclosure, optionally, Figure 7 and Fig.17The projection device shown also includes a first reflector 170, which is disposed in the second cavity Q120. Optionally, the first reflector 170 can be disposed on a side of the first fan 500 away from the first heat sink 160, and can be fixed to the first fan 500 or the housing 100 by means of a buckle or adhesive. Since the emitted light of the light source assembly 400 is parallel to the imaging assembly 200, the emitted light of the light source assembly 400 cannot directly enter the imaging assembly 200. The first reflector 170 can be disposed in the second cavity Q120, and the angle of the emitted light of the light source assembly 400 can be adjusted by the first reflector 170, so that the emitted light of the light source assembly 400 can vertically enter the imaging assembly 200.

[0092] In some embodiments of the present disclosure, optionally, Figure 7 and Fig.17 As shown, the projection device further includes a second reflector 180, and the second reflector 180 is disposed in the first cavity Q110. Optionally, the second reflector 180 can be disposed on the inner side of the housing 100 and located in the first cavity Q110, and the outgoing light of the second reflector 180 is collinear with the optical axis of the lens assembly 300. Optionally, the second reflector 180 is disposed in the first cavity Q110 at an angle relative to the imaging assembly 200 and the lens assembly 300, and the second reflector 180 can be detachably mounted on the inner side of the housing 100, so that the second reflector 180 is suspended relative to the imaging assembly 200, so that there is a certain optical path space between the second reflector 180 and the imaging assembly 200. Since the outgoing light of the imaging component 200 is parallel to the lens component 300, the outgoing light of the imaging component 200 cannot directly enter the lens component 300. A second reflector 180 can be set in the first cavity Q110. The angle of the outgoing light of the imaging component 200 can be adjusted by the second reflector 180 so that the outgoing light of the imaging component 200 can enter the lens component 300 vertically.

[0093] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the first fan 500 is arranged in the second cavity Q120. On the one hand, when the lens assembly 300 is fogged, the opening and closing assembly 600 opens the connecting port 120, and the first fan 500 can guide the air in the second cavity Q120 to the connecting port 120, so that the hot air in the second cavity Q120 can enter the first cavity Q110 through the connecting port 120, and form a first internal circulation air duct F110 in the first cavity Q110; on the other hand, the first fan 500 can also make the hot air circulate in the second cavity Q120 to form a second internal circulation air duct F120, so as to dissipate heat and cool the imaging assembly 200 in the second cavity Q120.

[0094] In some embodiments of the present disclosure, the first fan 500 may be a vortex fan or a piezoelectric fan, which drives the air in the cavity Q100 to flow in the internal circulation air duct F100. At the same time, the vortex fan or the piezoelectric fan can change the flow direction of the air, so that the air can circulate continuously in the cavity Q100.

[0095] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the housing 100 is provided with a third opening connected to the second cavity Q120; the projection device further includes a first radiator 160, which is provided at the third opening and is located in the second internal circulation air duct F120 formed in the second cavity by the first fan 500. By providing the third opening on the housing 100, and making the third opening connected to the second cavity Q120, and at the same time arranging the first radiator 160 at the third opening, so that the first radiator 160 is located in the second internal circulation air duct F120 formed by the first fan 500, at least a part of the first radiator 160 can be located in the second cavity Q120 to form a first heat exchange surface. The hot air in the second cavity Q120 circulates in the second internal circulation air duct F120 formed by the first fan 500, and can be in contact with the first heat exchange surface of the first radiator 160 for heat exchange. At the same time, the first heat dissipation surface of the first radiator 160 opposite to the first heat exchange surface is located outside the shell 100, and can be in contact with the cold air outside the shell 100 for heat dissipation. The heat in the second cavity Q120 can be conducted to the outside of the shell 100 through the first radiator 160 to dissipate heat and cool the second cavity Q120. Optionally, a plurality of heat dissipation fins can be provided on the side of the first radiator 160 away from the second cavity Q120, and heat is exchanged with the cold air outside the shell 100 through the heat dissipation fins, so that the heat in the second shell 100 is exchanged to the environment outside the shell 100. Optionally, the first radiator 160 can be a cast aluminum radiator.

[0096] In some embodiments of the present disclosure, Figures 2 to 15 As shown, a third opening communicating with the second cavity Q120 is provided at the rear side of the housing 100 , and the first heat sink 160 is disposed at the third opening and sealed to the housing 100 , so that the second cavity Q120 is in a sealed state at the third opening.

[0097] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the first heat sink 160 may be in an arc shape as a whole. The first heat sink 160 wraps the second cavity Q120 from the rear side of the projection device, which can improve the heat exchange efficiency between the first heat sink 160 and the hot air in the second cavity Q120.

[0098] In some embodiments of the present disclosure, Figures 2 to 15As shown, the first radiator 160 is detachably connected to the housing 100 to facilitate inspection, repair and replacement of the first radiator 160. After removing the first radiator 160, the optical device and / or heat dissipation device in the second cavity Q120 can be inspected, repaired and replaced.

[0099] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the projection device also includes a second radiator 800 and a second fan 900. The second radiator 800 is arranged on the outside of the shell 100 corresponding to the light source assembly 400. The second fan 900 is arranged outside the shell 100 to form an external air duct F200 outside the shell 100, and the external air duct F200 passes through the second radiator 800.

[0100] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the second heat sink 800 is arranged on the outer side of the housing 100 corresponding to the light source assembly 400, and is used to dissipate heat from the light source assembly 400. Optionally, the second heat sink 800 can be in contact with the light source assembly 400 for heat transfer and heat dissipation, and the second heat sink 800 can also be connected with the light source assembly 400 through a heat pipe 810 for heat transfer and heat dissipation. For example, the second heat sink 800 can be provided with a heat conducting plate 820, and the heat conducting plate 820 is in contact with the light source assembly 400 to transfer heat with the light source assembly 400, and the heat conducting plate 820 is also connected with the second heat sink 800 through the heat pipe 810, so that the heat generated by the light source assembly 400 is transferred to the second heat sink 800 through the heat pipe 810, and the heat is dissipated through the second heat sink 800. Optionally, the second heat sink 800 can be a cast aluminum heat sink.

[0101] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the second fan 900 is arranged outside the housing 100. Optionally, the second fan 900 can be fixed outside the housing 100, or can be fixed through the second radiator 800, so that the second radiator 800 is located outside the housing 100. The second fan 900 is used to form an external air duct F200 outside the housing 100, so that the external air duct F200 passes through the second radiator 800, improves the air flow speed of the second radiator 800, and thus improves the heat dissipation efficiency of the second radiator 800. Optionally, the external air duct F200 can pass through the bottom of the housing 100, that is, the ventilation gap between the bottom of the housing 100 and the base.

[0102] In some embodiments of the present disclosure, the second fan 900 may be a vortex fan or an axial flow fan.

[0103] In some embodiments of the present disclosure, Fig.11 and Fig.14As shown, the external air duct F200 can pass through the outside of the first radiator 160, that is, the external air duct F200 formed by the second fan 900 also passes through the outside of the first radiator 160, which can increase the air flow speed outside the first radiator 160, thereby improving the heat dissipation efficiency of the first radiator 160.

[0104] As an optional implementation, Figures 4 to 14 As shown, the communication port 120 is located on a side of the imaging assembly 200 adjacent to the lens assembly 300 .

[0105] In some embodiments of the present disclosure, Figures 4 to 14 As shown, the connecting port 120 is located on the side of the imaging assembly 200 adjacent to the lens assembly 300. Under the driving action of the first fan 500, after the air in the second cavity Q120 enters the first cavity Q110, it can first pass through the part of the lens assembly 300 located in the first cavity Q110, thereby increasing the air flow speed and temperature at the lens assembly 300 and improving the defog effect of the lens assembly 300.

[0106] As an optional implementation, Figures 2 to 15 As shown, the opening and closing component 600 includes a support rod 610 and a baffle 620, the support rod 610 includes a first end 611 and a second end 612 opposite to each other, the first end 611 and the second end 612 are arranged on the shell 100; the baffle 620 is arranged on the support rod 610; wherein, the support rod 610 is rotatably arranged on the shell 100 or the baffle 620 is rotatably arranged on the support rod 610, when the connecting port 120 is closed, the ends of the baffle 620 are respectively connected or overlapped with the shell 100 and the imaging component 200, and when the connecting port 120 is opened, at least the end of the baffle 620 is separated from the imaging component 200.

[0107] In some embodiments of the present disclosure, Figures 2 to 15 As shown, optionally, when the support rod 610 is rotatably disposed on the housing 100, the baffle 620 can be fixed on the support rod 610, and the rotation of the support rod 610 can drive the baffle 620 to rotate synchronously, and the baffle 620 can switch between a state of closing the communication port 120 and a state of opening the communication port 120 when rotating. Figures 10 to 12 As shown, when the baffle 620 is rotated to be parallel to the imaging assembly 200, the end of the baffle 620 corresponding to the housing 100 can be docked with the housing 100, and the end of the baffle 620 corresponding to the imaging assembly 200 can be docked or overlapped with the imaging assembly 200, so that the baffle 620 can cover the connecting port 120, and the internal circulation air duct F100 can be cut off at the connecting port 120, and the circulating air generated by the first fan circulates in the second internal circulation air duct F120, that is, the connecting port 120 is in a closed state, so that the projection device can be in a stable mode. Figures 13 to 15 As shown, when the baffle 620 rotates a certain angle, at least the end portion of the baffle 620 corresponding to the imaging assembly 200 can be separated from the imaging assembly 200, so that part of the connecting port 120 between the baffle 620 and the imaging assembly is opened, so that the first internal circulation air duct F110 of the internal circulation air duct F100 is connected with the second internal circulation air duct F120 at the connecting port 120, and the circulating air generated by the first fan can enter the first internal circulation air duct F110 from the second internal circulation air duct F120 through the connecting port 120 and circulate in the first internal circulation air duct F110, and the air circulates in the first internal circulation air duct F110, The air flow speed and temperature at the lens assembly 300 in the first cavity Q110 can be increased, and the temperature of the lens assembly 300 and the first cavity Q110 can be balanced more quickly, so that the temperature difference between the lens assembly 300 and the first cavity Q110 can be eliminated more quickly, thereby increasing the rate of eliminating water mist on the lens assembly 300, thereby improving the projection effect of the projection device; for example, after the baffle 620 rotates 90° relative to the imaging assembly 200, the baffle 620 is attached to the inner wall of the housing 100 to be separated from the imaging assembly 200, and the baffle 620 can avoid the communication port 120, that is, it is in a state of opening the communication port 120. Optionally, the rotation angle of the support rod 610 can be used to control the angle at which the baffle 620 is separated from the imaging assembly 200, so as to adjust the range of the baffle 620 covering the communication port 120, thereby adjusting the air volume and wind speed entering the first cavity through the communication port 120, thereby controlling the demisting effect of the demisting mode.

[0108] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the ends of the baffle 620 are respectively connected or overlapped with the shell 100 and the imaging component 200, which means that the end of the baffle 620 can be in contact with the shell 100 or the imaging component 200, or the end of the baffle 620 is overlapped on the shell 100 or the imaging component 200, so that the baffle 620 and the shell 100 or the imaging component 200 have a partial overlap, so that there is no gap or the gap is relatively small between the baffle 620 and the shell 100 or the imaging component 200, and air cannot easily pass through.

[0109] Optionally, a support structure may be provided inside the housing 100 , so that the first end 611 and the second end 612 of the support rod 610 are supported on the support structure, so that the support rod 610 is supported by the support structure and can rotate relative to the housing 100 .

[0110] Optionally, the housing 100 may be provided with a mounting hole, so that the first end 611 and the second end 612 of the support rod 610 are placed in the mounting hole to support the support rod 610 and enable the support rod 610 to rotate relative to the housing 100 .

[0111] In some embodiments of the present disclosure, optionally, the baffle 620 is rotatably disposed on the support rod 610, the baffle 610 can rotate relative to the support rod, and the baffle 620 can switch between a state of closing the connecting port 120 and a state of opening the connecting port 120 when rotating.

[0112] Optionally, the opening and closing component 600 may include only one baffle 620, the size of which is comparable to that of the connecting port 120, so that the baffle 620 can be rotated to cover the connecting port 120 or avoid the connecting port 120, so that the projection device can switch between the defog mode and the stable mode; optionally, the range of the baffle 620 covering the connecting port 120 can be adjusted by controlling the rotation angle of the baffle 620 relative to the imaging component 200, thereby adjusting the size of the open area of ​​the connecting port 120, thereby adjusting the air volume and wind speed entering the first cavity through the connecting port 120, thereby controlling the defog effect of the defog mode.

[0113] Optionally, the opening and closing group 600 may include more than two split baffles, and the more than two split baffles are arranged in parallel on the support rod 610, so that the more than two split baffles form a structure with a size equivalent to the connecting port 120, and the more than two split baffles can jointly cover the connecting port 120 to close the connecting port 120; at the same time, the split baffles can be rotatably arranged on the support rod 610, so that each split baffle can be individually controlled and rotated, thereby controlling the position and size of the opening of the connecting port 120, and then adjusting the size and position of the open area of ​​the connecting port 120, thereby adjusting the air volume and wind speed entering the first cavity through the connecting port 120, so as to control the defogger effect of the defogger mode.

[0114] In some embodiments of the present disclosure, the baffle 620 can be made of materials such as iron and stainless steel. The baffle 620 made of such materials has a low cost and does not require a complex mold, thereby reducing the manufacturing cost of the projection device.

[0115] In some embodiments of the present disclosure, the baffle 620 may be made of polymer materials such as plastic. The baffle 620 made of such materials has excellent properties such as high precision and light weight.

[0116] As an optional implementation, Figures 2 to 15 As shown, when the communication port 120 is opened, the blocking piece 620 can be rotated to fit with the housing.

[0117] In some embodiments of the present disclosure, when the communication port 120 is opened, the baffle 620 can be rotated to fit with the housing, so that the baffle 620 completely avoids the communication port 120 , thereby preventing the baffle 620 from generating wind resistance in the communication port 120 .

[0118] As an optional implementation, Figures 2 to 15 As shown, the opening and closing assembly 600 also includes a driving member 630. When the support rod 610 is rotatably disposed on the shell 100, the driving member 630 is connected to the support rod 610, and the driving member 630 is used to drive the support rod 610 to rotate; or, when the baffle 620 is rotatably disposed on the support rod 610, the driving member 630 is used to drive the baffle 620 to rotate.

[0119] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the opening and closing assembly 600 of the projection device may include a driving member 630 .

[0120] Optionally, when the support rod 610 is rotatably disposed on the shell 100, the driving member 630 is connected to the support rod 610, and the support rod 610 is driven to rotate by the driving member 630, so that the blocking piece 620 can be driven to rotate by the support rod 610, thereby realizing automatic engagement of the opening and closing assembly 600, thereby achieving the purpose of automatically closing the connecting port 120 and opening the connecting port 120.

[0121] Optionally, when the baffle 620 is rotatably disposed on the support rod 610, the driving member 630 is used to drive the baffle 620 to rotate, so that the baffle 620 can rotate around the support rod 610 to achieve automatic engagement of the opening and closing assembly 600, thereby achieving the purpose of automatically closing the connecting port 120 and opening the connecting port 120.

[0122] Optionally, the driving member 630 can be fixed to the shell 100 by a driving fixing member 631, and the driving member 630 can be fixed on the inner side of the shell 100, that is, the driving member 630 can be located inside the cavity Q100; the driving member 630 can also be fixed on the outer side of the shell 100, that is, the driving member 630 is located outside the cavity Q100.

[0123] As an optional embodiment, the driving member 630 is a motor, which is connected to the support rod 610 and is used to drive the support rod 610 to rotate; or, the driving member 630 is an electromagnetic switch, which is used to magnetically attract the baffle 620 to rotate the baffle 620.

[0124] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the driving member 630 may be a motor, which drives the support rod 610 to rotate, thereby driving the blocking piece 620 to open and close at the communication port 120 .

[0125] Optionally, the driving member 630 may be a stepping motor, which can control the number of gear steps more accurately, thereby improving the accuracy of the rotation angle of the support rod 610 and the blocking piece 620 .

[0126] In some embodiments of the present disclosure, the driving member 630 may also be an electromagnetic switch, in which case the blocking piece 620 needs to be magnetic, so that the electromagnetic switch can magnetically attract the blocking piece 620 when it is working, so that the blocking piece 620 can rotate around the support rod 610, and the communication port 120 is closed and opened by the rotation of the blocking piece 620. Optionally, the electromagnetic switch can be located below the lens assembly 300 and above the blocking piece 620. When the control module 1000 receives the detection information of the water mist detection component and determines that the lens assembly 300 is fogged, the control module 1000 can send a signal to the electromagnetic switch to enter the defogging mode. After the electromagnetic switch is powered on, the coil of the electromagnetic switch generates magnetism, adsorbs the magnetic baffle 620 so that the baffle 620 rotates under the support of the support rod 610 to open the connecting port 120; when the control module 1000 receives the detection information of the water mist detection component and determines that the water mist of the lens assembly 300 is eliminated, the control module 1000 can send a signal to the electromagnetic switch to enter the stable mode. After the electromagnetic switch is powered off, the magnetism of the coil of the electromagnetic switch is eliminated, and the magnetic baffle 620 loses its magnetic attraction and naturally sinks to dock or overlap with the imaging module under the action of gravity to close the connecting port 120, and the projection device returns to the stable mode. Among them, the amount of electromagnet power of the electromagnetic switch depends on the selection of the electromagnetic switch and the specifications of the projection device. Taking the size of a 4.45-inch vertical projector as an example, the baffle 620 is about 4g and weighs about 0.04N. The electromagnetic switch can be selected with a specification of 3V 0.1A. When the current is full, it can generate a suction force of about 0.3N, which can cover the force required to adsorb the baffle.

[0127] As an optional implementation, the blocking piece 620 includes at least two split blocking pieces, and the opening and closing assembly includes electromagnetic switches of a number corresponding to the split blocking pieces, and the electromagnetic switches and the split blocking pieces are arranged on the housing in a one-to-one correspondence.

[0128] In some embodiments of the present disclosure, the baffle 620 may include more than two split baffles, and the two or more split baffles are arranged in parallel on the support rod 610, so that the two or more split baffles form a structure with a size equivalent to the connecting port 120. At the same time, the opening and closing assembly includes electromagnetic switches corresponding to the number of split baffles, and the electromagnetic switches and the split baffles are arranged on the housing 100 in a one-to-one correspondence, so that each split baffle can be individually controlled, so that each split baffle rotates independently relative to the support rod 610 under the action of the electromagnetic switch, thereby controlling the position and range of the split baffle covering the connecting port 120, and adjusting the size and position of the open area of ​​the connecting port 120, thereby adjusting the air volume and wind speed entering the first cavity through the connecting port 120, so as to control the demisting effect of the demisting mode.

[0129] As an optional implementation, Figures 2 to 15As shown, the opening and closing assembly 600 further includes a transmission member 640 , which is connected to the driving member 630 , and the transmission member 640 is also connected to the support rod 610 or the blocking piece 620 .

[0130] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the driving member 630 can be connected to the support rod 610 or the baffle 620 through the transmission member 640. On the one hand, the transmission member 640 can widen the setting position of the driving member 630, so that there is a larger setting space between the driving member 630 and the support rod 610, which is convenient for adjusting the setting position of the driving member 630 according to the conditions inside and outside the housing 100. On the other hand, the rotation angle ratio between the output shaft of the driving member 630 and the support rod 610 or the baffle 620 can be adjusted to improve the rotation accuracy of the support rod 610 and the baffle 620.

[0131] In some embodiments of the present disclosure, Figures 2 to 15 As shown Fig.21 As shown, the transmission member 640 may include a gear or a gear set formed by two or more gears. For example, the transmission member 640 may include a gear set formed by two gears meshing with each other, and the gear set is meshed and connected with the support rod 610, and is also meshed and connected with the output shaft of the driving member 630, so that when the output shaft of the driving member 630 rotates, it can be transmitted to the support rod 610, so that the support rod 610 can be rotated under the drive of the driving member 630. For example, when the output shaft of the driving member 630 rotates 20°, the support rod 610 can be rotated 5° after being transmitted by the transmission member 640, so that the rotation angle of the support rod 610 can be adjusted more accurately, and the control accuracy of the support rod 610 and the baffle 620 can be improved. Optionally, the transmission member 640 may include two gears, and the end of the support rod 610 may be fixedly connected to a gear via an end fixing member 615 so that the support rod 610 can rotate synchronously with the gear, and the gear is engaged with another gear on the output shaft of the driving member 630, thereby realizing the connection between the driving member 630 and the support rod 610.

[0132] In some embodiments of the present disclosure, Figures 10 to 15 As shown, the projection device can realize two different internal circulation air ducts F100 by rotating the blocking piece in the opening and closing assembly 600 , and can automatically switch between the two internal circulation air ducts F100 under the linkage of the transmission member 640 of the driving member 630 .

[0133] like Figures 10 to 12As shown, in a stable mode without the need for defogger, the baffle 620 is closed on the connecting port 120, and the air outlet of the first fan 500 is opposite to the space below the display panel 230. Driven by the first fan 500, air is blown out from the air outlet of the first air, passes through the gap between the first Fresnel lens 210, the heat-insulating transparent body 220 and the display panel 230, and completes the first heat exchange with the display panel 230 below the display panel 230; then, it turns at the position corresponding to the end of the imaging component 200 and the connecting port 120, passes through the gap between the second Fresnel lens 240 and the display panel 230, and completes the secondary heat exchange with the display panel 230 above the display panel 230; then, it flows back to the first radiator 160, dissipates heat at the first radiator 160, and then flows back to the air inlet of the first fan 500, realizing the second internal circulation air duct F120 in the second cavity Q120. In the stable mode, the internal circulation air duct F100 only includes the second internal circulation air duct F120. Since the circulation path of the second internal circulation air duct F120 is shorter, the air flow speed of the second internal circulation air duct F120 can be increased, the heat exchange efficiency can be improved, and thus the heat dissipation effect on the display panel 230 can be improved.

[0134] like Figures 13 to 15As shown, when water mist appears on the lens assembly 300 or the risk of water mist is high, the baffle 620 can be automatically rotated by the driving member 630 or manually rotated to put the projection device into the defog mode. At this time, the baffle 620 rotates to avoid the connecting port 120, so that the connecting port 120 is open, and the air outlet of the first fan 500 is opposite to the space below the display panel 230. Driven by the first fan 500, air is blown out from the air outlet of the first wind, passes through the gap between the first Fresnel lens 210, the heat-insulating transparent body 220 and the display panel 230, and completes the first heat exchange with the display panel 230 below the display panel 230; then part of the air volume enters the first cavity Q110 through the connecting port 120, passes through the lens assembly 300 and then turns to the second reflector 180, and then can circulate between the lens assembly 300, the second reflector 180 and the top of the second Fresnel lens 240, forming a first internal circulation air duct F110 in the first cavity, which can increase The air circulation and temperature inside the lens assembly 300 are increased, so that the temperature inside the lens assembly 300 is balanced with the temperature inside the cavity Q100 more quickly, thereby improving the condensation conditions of water vapor inside the lens assembly 300 and dissipating the water mist inside the lens assembly 300; at the same time, the remaining air volume and the air volume returning from the first cavity Q110 are turned at the end of the imaging assembly 200 and the position corresponding to the connecting port 120, pass through the gap between the second Fresnel lens 240 and the display panel 230, and complete the secondary heat exchange with the display panel 230 above the display panel 230; then flow back to the first radiator 160, dissipate the heat at the first radiator 160, and flow back to the air inlet of the first fan 500, so as to realize the second internal circulation air duct F120 in the second cavity Q120. In the defog mode, the internal circulation air duct F100 includes a first internal circulation air duct F110 and a second internal circulation air duct F120, which can guide part of the hot air to the lens assembly 300 in the first cavity Q110, thereby improving the water vapor condensation conditions of the lens assembly 300, and avoiding fogging on the inside of the lens assembly 300 and accelerating the dissipation of water mist on the inside of the lens assembly 300 to a certain extent.

[0135] In the defog mode, due to the drainage effect after the connecting port 120 is opened, about 10% of the air volume generated by the first fan 500 enters the first cavity Q110 to form the first internal circulation air duct F110, which reduces the air volume of the second internal circulation air duct F120, which may affect the heat dissipation effect of the components in the second cavity Q120 to a certain extent. Therefore, after the water mist on the lens assembly 300 dissipates, it is possible to switch back to the stable mode in time to ensure the heat dissipation effect of the imaging assembly 200 and extend the service life of the projection equipment.

[0136] In some embodiments of the present disclosure, Figures 10 to 15As shown, in the defogging mode and the stable mode, the change of the inner circulation air duct F100 will not affect the outer air duct F200 of the projection device. Under the action of the second fan 900, the air flows into the gap between the bottom of the housing 100 and the control module 1000 after exchanging heat with the outside of the first radiator 160, and can continue to flow through the second radiator 800 to exchange heat with the second radiator 800 after exchanging heat with the control module 1000, which can increase the air flow speed outside the first radiator 160, and can also ensure the air flow speed of the second radiator 800, and ensure the heat dissipation effect of the first radiator 160 and the second radiator 800.

[0137] As an optional implementation, the driving member 630 is disposed in the cavity Q100.

[0138] In some embodiments of the present disclosure, the driving member 630 may be located in the cavity. Optionally, the driving member 630 may be fixed on the shell 100, that is, the driving member 630 is connected to the support rod 610 in the cavity Q100, so that the support rod 610 does not have to pass through the shell 100 to extend outside the cavity Q100, thereby reducing the number of openings of the shell 100 and ensuring the sealing of the shell 100.

[0139] As an optional implementation, the first end 611 extends to the outside of the cavity Q100 , the driving member 630 is disposed outside the cavity Q100 , and the driving member 630 is connected to the first end 611 .

[0140] In some embodiments of the present disclosure, the first end 611 of the support rod 610 can be extended to the outside of the cavity Q100, and the driving member 630 can be arranged outside the cavity Q100. Optionally, the driving member 630 can also be fixed on the housing 100, and the driving member 630 is connected to the first end 611 of the support rod 610. For example, the driving member 630 can be fixed to the outside of the housing 100 by driving the fixing member 631 so that the driving member 630 is located outside the cavity 630. The driving member 630 can be fixed on the housing 100, and the driving member 630 is connected to the first end 611 outside the housing 100, so that the driving member 630 or the driving member 630 and the transmission member 640 are both located outside the cavity Q100, so as to avoid the driving member 630 or the transmission member 640 being located in the cavity Q100 and affecting the wind resistance of the internal circulation air duct F100.

[0141] As an optional implementation, the projection device further includes a water mist detection component, which is used to detect the water mist state of the lens assembly 300 , and the water mist detection component is electrically connected to the driving member 630 .

[0142] In some embodiments of the present disclosure, the projection device also includes a water mist detection component, which can detect the water mist state of the lens assembly 300. By electrically connecting the water mist detection component to the driving component 630, the driving component 630 can be automatically controlled according to the detection result of the water mist detection component, and then the baffle 620 can be automatically controlled to close the connecting port 120 and open the connecting port 120, thereby realizing automatic detection of water mist in the lens assembly 300 and automatic defog function of the projection device.

[0143] As an optional embodiment, the water mist detection assembly includes a temperature and humidity sensor and / or a water mist detection camera. The temperature and humidity sensor is disposed in the first cavity Q110; the water mist detection camera is disposed inside the housing 100 or outside the housing 100, and the shooting range of the water mist detection camera covers the lens assembly 300.

[0144] Condensation refers to the phenomenon that condensed water appears on the surface of an object when the surface temperature is lower than the dew point temperature of the nearby air. It is an objective climatological phenomenon. At a certain temperature, when the water vapor reaches the saturated state of water vapor partial pressure, heat will be released to form dew. In a humid unsaturated gas, if the temperature of the voids, surface, and interior of an object is lower than that of the air, condensation will occur on the water vapor in the surrounding air. The coagulation of water vapor can be divided into bead coagulation and film coagulation. Based on the coagulation principle of water vapor, the temperature inside the lens assembly 300 and the humidity inside the first cavity Q110 can be measured by a temperature and humidity sensor to determine whether the lens assembly 300 has condensed and mist has appeared.

[0145] In some embodiments of the present disclosure, the water mist detection component may include a temperature and humidity sensor, which may be disposed in the first cavity Q110, for detecting the temperature inside the lens assembly 300 and the humidity inside the first cavity Q110. The detected temperature inside the lens assembly 300 and the humidity inside the first cavity Q110 may be compared with the ambient temperature, relative humidity, and dew point comparison table (constant temperature and humidity chamber) shown in Table 1 to determine whether the temperature inside the lens assembly 300 and the humidity inside the first cavity Q110 measured by the temperature and humidity sensor have reached the condensation condition, thereby determining whether the lens assembly 300 needs to be defogged. The ambient temperature may be obtained by a temperature sensor disposed outside the projection device housing 100, or may be obtained from the cloud or the network through the control module 1000. When it is determined that the lens assembly 300 needs to be defogged, a signal can be sent to the driver 630 so that the driver 630 drives the support rod 610 and the baffle 620 to rotate, thereby opening the communication port 120, so that the projection device enters the defog mode, prevents the lens assembly 300 from fogging or dissipates the water mist on the lens assembly 300; when it is determined that the lens assembly 300 is completed or does not need to be defogged, a signal can be sent to the driver 630 so that the driver 630 drives the support rod 610 and the baffle 620 to rotate, thereby closing the communication port 120 and keeping it closed, so that the projection device enters the stable mode. Through the cooperation of the driver 630 and the temperature and humidity sensor, automatic defog of the projection device can be achieved. Optionally, the temperature and humidity sensor can be electrically connected to the control module 1000, and the control module 1000 determines whether the lens assembly 300 needs to be defogged based on the detection results of the temperature and humidity sensor; at the same time, the control module 1000 is electrically connected to the driving component 630, and the control module 1000 can control the driving component 630 to perform corresponding actions based on the judgment result of whether defogger is needed.

[0146] Table 1 Comparison table of ambient temperature, relative humidity and dew point (constant temperature and humidity chamber)

[0147]

[0148]

[0149] For example, when the temperature and humidity sensor detects that the temperature inside the lens assembly 300 and the humidity inside the first cavity Q110 have a large temperature difference or humidity difference with the external environment. The critical point of the temperature difference is the dew point temperature, which is related to the ambient temperature and relative humidity. Taking Beijing as an example, when the ambient temperature is 26℃~29℃ and the relative humidity is 55%~60%, the dew point temperature is 16.3℃~20.5℃. That is to say, when the ambient temperature is 26℃~29℃ and the relative humidity is 55%~60%, when the temperature inside the lens assembly 300 is 16.3℃~20.5℃ lower than the ambient temperature, water vapor will condense on the inner side of the lens assembly 300 to form water mist.

[0150] In some embodiments of the present disclosure, optionally, a temperature and humidity sensor can be arranged in a position adjacent to the lens assembly 300 in the first cavity Q110. At the same time, the setting position of the temperature and humidity sensor should not affect the optical path between the imaging assembly 200 and the lens assembly 300, so that the temperature and humidity sensor can reflect the inner temperature of the lens assembly 300 as much as possible.

[0151] In some embodiments of the present disclosure, optionally, the temperature and humidity sensor may include a temperature sensor and a humidity sensor. The temperature sensor and the humidity sensor are arranged in a split manner. The temperature sensor can be arranged in the lens assembly 300 without affecting the position of the optical path of the lens assembly 300, and is used to detect the temperature inside the lens assembly 300; the humidity sensor is arranged in the first cavity Q110, and is used to detect the humidity in the first cavity Q110.

[0152] In some embodiments of the present disclosure, the water mist detection assembly may include a water mist detection camera, which is disposed on the inside of the shell 100 or the outside of the shell 100, and the shooting range of the water mist detection camera covers the lens assembly 300. Based on the image of the lens assembly 300 taken by the water mist detection camera and the image recognition algorithm, it can be determined whether water mist is generated on the lens assembly 300.

[0153] In some embodiments of the present disclosure, optionally, the water mist detection camera can be shared with the camera used for focusing and keystone correction and other functions in the projection device, that is, the same camera can be used to perform both the water mist detection function and the focusing and keystone correction functions.

[0154] When judging whether water mist is generated in the lens assembly 300 based on the image of the lens assembly 300 taken by the water mist detection camera and the image recognition algorithm, the image of the lens assembly 300 taken by the water mist detection camera can be divided into several parts. When more than half of the images appear blurred, whitish, condensed, etc., it can be judged that water mist has appeared in the lens assembly 300, and a signal can be sent to the driving member 630 to make the driving member 630 drive the support rod 610 and the baffle 620 to rotate, thereby opening the connecting port 120, so that the projection device enters the defog mode; when no blurry, whitish, condensed, etc. images appear, it can be judged that the water mist of the lens assembly 300 has been eliminated, and a signal can be sent to the driving member 630 to make the driving member 630 drive the support rod 610 and the baffle 620 to rotate, thereby closing the connecting port 120 and keeping it closed, so that the projection device enters the stable mode. For example, the image of the lens assembly 300 taken by the water mist detection camera can be divided into 9 parts. When more than 5 parts of the images appear blurred, whitish, condensed, etc., it can be determined that water mist appears in the lens assembly 300, and a signal can be sent to the driving member 630 to enable the driving member 630 to drive the support rod 610 and the baffle 620 to rotate, thereby opening the connecting port 120 and allowing the projection device to enter the defog mode; when no image appears blurred, whitish, condensed, etc., it can be determined that the water mist of the lens assembly 300 has been eliminated, and a signal can be sent to the driving member 630 to enable the driving member 630 to drive the support rod 610 and the baffle 620 to rotate, thereby closing the connecting port 120 and maintaining the closed state, so that the projection device enters the stable mode.

[0155] As an optional implementation, the first end 611 extends to the outside of the shell 100 and is provided with a rotating handle 613 , or the second end 612 extends to the outside of the shell 100 and is provided with a rotating handle 613 .

[0156] In some embodiments of the present disclosure, Fig. 9 As shown, the first end 611 or the second end 612 of the support rod 610 can extend to the outside of the housing 100 and is provided with a rotating handle 613. The support rod 610 and the baffle 620 can be manually rotated by rotating the handle 613 to manually start the defog mode and manually restore the stable mode, so that the projection device has a manual defog function. The projection device adopts a manual defog mode, and it can be judged by human eye observation whether it is necessary to enter the defog mode, which can reduce the cost of setting the driving member 630 and the water mist detection component, and improve the economy of the projection device.

[0157] In some embodiments of the present disclosure, the opening and closing component 600 can be provided with a driving member 630 to realize an automatic defog function, and can also be provided with a rotating handle 613 to realize a manual defog function, or can also be provided with a driving member 630 and a rotating handle 613 at the same time, so that the projection device has both an automatic defog function and a manual defog function.

[0158] As an optional implementation, Fig.21 As shown, sealing rings 614 are respectively provided at the rotational connection between the first end 611 and the second end 612 and the housing 100 .

[0159] In some embodiments of the present disclosure, Fig.21 As shown, by respectively providing sealing rings 614 at the rotational connections between the first end 611 and the second end 612 and the shell 100, the sealing performance of the shell 100 at the first end 611 and the second end 612 of the support rod 610 can be improved, thereby preventing dust from entering the cavity Q100 under the action of static electricity and being adsorbed on the imaging component 200, or preventing water vapor from entering the cavity Q100 and easily condensing on the lens component 300, thereby ensuring that the projection picture of the projection device is clear.

[0160] As an optional implementation, Figures 18 to 20 As shown, a sealing gasket 130 and / or a sealing matching structure 140 is provided at the joint of the projection device.

[0161] In some embodiments of the present disclosure, Figures 18 to 20 The projection device shown is provided with a sealing gasket 130 and / or a sealing matching structure 140 at the joints. For example, a sealing gasket 130 may be provided at the joints of the shell 100, the joints of the shell 100 and the lens assembly 300, the joints of the shell 100 and the first radiator 160, etc., and a sealing matching structure 140 may also be provided. A sealing gasket 130 and a sealing matching structure 140 may also be provided at the same time, thereby improving the overall sealing of the projection device, preventing dust from entering the cavity Q100 under the action of static electricity and being adsorbed on the imaging assembly 200, or preventing water vapor from entering the cavity Q100 and easily condensing on the lens assembly 300, thereby ensuring that the projection image of the projection device is clear.

[0162] For example, Fig.19 and Fig. 20 As shown, when the shell 100 includes a first shell 100 and a second shell 100, the first shell 100 and the second shell 100 are respectively located on the left and right sides of the optical machine, a sealing stop 141 can be provided at the joint between the first shell 100 and the second shell 100, and a sealing counter-stop 142 can be provided at the joint between the second shell 100 and the first shell 100. When the first shell 100 and the second shell 100 are snap-fitted and spliced, a sealing matching structure 140 is formed by the sealing stop 141 and the sealing counter-stop 142 to ensure the sealing between the first shell 100 and the second shell 100.

[0163] For example, an airtight sealing filler such as a sealing gasket 130 is provided between the first opening 110 of the shell 100 and the lens assembly 300, so that the first cavity Q110 maintains good sealing, which can prevent dust from entering the first cavity Q110 and keep the optical device in the first cavity Q110 clean.

[0164] For example, an airtight sealing filler such as a sealing gasket 130 is provided between the third opening of the housing 100 and the first heat sink 160, so that the second cavity Q120 maintains good sealing, which can prevent dust from entering the second cavity Q120 and keep the optical device in the second cavity Q120 clean.

[0165] For example, optionally, the lens assembly 300 includes an inner lens 310, an outer lens, and a head lens barrel, and the inner lens 310 and the outer lens 320 are arranged at opposite ends of the lens barrel. The assembly point of the inner lens 310 and the lens barrel, the assembly point of the outer lens 320 and the lens barrel, and the splicing point of the lens barrel itself can be provided with a sealing gasket 130 and / or a sealing matching structure 140.

[0166] As an optional implementation, Figures 2 to 15 As shown, the housing 100 is provided with a ventilation hole 150 communicating with the first cavity Q110 and / or the second cavity Q120 , and a dustproof net and a waterproof breathable membrane are provided at the ventilation hole 150 .

[0167] In some embodiments of the present disclosure, Figures 2 to 15 As shown, the housing 100 is provided with a ventilation hole 150 connected to the first cavity Q110 and / or the second cavity Q120. Optionally, the diameter of the ventilation holes 150 reserved on the housing 100 is small and the number is large. The ventilation holes 150 can increase the air in and out of the cavity Q100, balance the temperature and humidity inside and outside the cavity Q100, and quickly reduce the temperature difference inside and outside the cavity Q100, thereby improving the fogging defect of the lens assembly 300; at the same time, a dustproof net and a waterproof breathable membrane are provided at the ventilation holes 150 to isolate water vapor and dust from entering the cavity Q100, and only allow air to enter the cavity Q100.

[0168] In some embodiments of the present disclosure, the dustproof net can be made of non-woven fabrics, nylon nets, sponges, etc. The waterproof breathable membrane can be a water and oxygen barrier membrane. Optionally, the waterproof breathable membrane can be selected from any one of a graphene film, an aluminum-plated film, an aluminum oxide-plated film, and a silicon oxide film.

[0169] As an optional implementation, the dustproof net and the waterproof breathable membrane are both black.

[0170] In some embodiments of the present disclosure, the dustproof net and the waterproof breathable membrane are both black, thereby reducing the light transmittance of the dustproof net and the waterproof breathable membrane, thereby preventing light leakage and brightness loss caused by the light source assembly 400 in the cavity Q100 passing through the breathable through hole 150.

[0171] As an optional implementation, Fig. 22 As shown, the lens assembly 300 includes an inner lens 310 and an outer lens 320 , wherein the inner lens 310 is located in the first cavity Q110 , and the outer lens 320 is located outside the cavity Q100 , and the inner lens 310 and / or the outer lens 320 are provided with a waterproof coating.

[0172] In some implementations of the present disclosure, Fig. 22 As shown, the lens assembly 300 includes an inner lens 310 and an outer lens 320. The inner lens 310 and / or the outer lens 320 are provided with a waterproof coating, which may be a hydrophobic film, so that the surface of the inner lens 310 and / or the outer lens 320 is hydrophobic. Under this effect, water molecules in the air are not easily condensed into water mist on the surface of the inner lens 310 and / or the outer lens 320, thereby increasing the threshold of the influence of temperature and humidity on the lens assembly 300, thereby reducing the probability of water mist generation on the lens assembly 300 and shortening the defog time.

[0173] As an optional implementation, the lens assembly 300 further includes a lens barrel, and an inner lens 310 and an outer lens 320 are respectively disposed at opposite ends of the lens barrel, and the lens barrel is filled with an inert gas.

[0174] In some embodiments of the present disclosure, by filling the lens barrel with an inert gas, such as nitrogen, helium or other inert gas, it is also possible to suppress, to a certain extent, the condensation of water molecules in the air into water mist on the surface of the inner lens 310 and / or the outer lens 320, thereby reducing the probability of fogging of the lens assembly 300.

[0175] In some embodiments of the present disclosure, Fig.23 As shown in Table 2, taking a 4.45-inch platform projection device as an example, the defogging effects of the projection device with different defogging measures were tested after it was moved to room temperature and turned on after being stored at 0°C for 30 minutes.

[0176] Table 2 Defogging effect of projection equipment using different defogging measures

[0177]

[0178]

[0179] Fig.23 The demisting effect diagram after the opening and closing components are provided to improve the internal circulation air duct is shown. Fig.23 It can be seen that after the projection equipment is stored at 0℃ for 30 minutes and then moved to room temperature and turned on immediately, Fig.23 a shows the water mist on the inner lens 3 minutes after the camera is turned on. It can be seen that obvious water mist appears on the inner lens; Fig.23 b shows the water fog on the inner lens 9 minutes after the camera is turned on. It can be seen that the fog on the inner lens begins to disappear; Fig.23 c shows the water fog on the inner lens 11 minutes after the camera was turned on. It can be seen that the fog on the inner lens has disappeared by more than half; Fig.23 d shows the water mist on the inner lens 12 minutes after startup. It can be seen that the fog on the inner lens has basically disappeared and does not affect the display effect of the projection equipment.

[0180] It can be seen from Table 2 that when the projection device adopts the combined measures of the opening and closing component 600 to improve the internal circulation air duct F100 and the waterproof coating to improve the water-repellent property of the lens, the fogging phenomenon of the lens component 300 is extremely slight and can be eliminated in a relatively short time. The defogging effect is good, and the phenomenon that the lens component 300 is easily fogged and affects the clarity of the image can be effectively improved.

[0181] Based on the same inventive concept, an embodiment of the present disclosure proposes a projection system, which includes a projection screen and the above-mentioned optical machine, and the projection screen is used to receive the projection image of the optical machine.

[0182] The projection device proposed in the present disclosure can, to a certain extent, solve the problem of the lens assembly 300 being prone to condensation of water mist when the projection device is under specific environmental conditions (hanging or in an environment with large temperature changes) by means of an opening and closing assembly 600 and the provision of a waterproof coating, thereby ensuring the projection effect of the projection device and improving the user experience.

[0183] Since the projection system provided by the present invention includes the projection device of the above technical solution, the projection system provided by the present invention has all the beneficial effects of the above projection device, which will not be described in detail here.

[0184] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0185] It should be noted that all directional indications in the embodiments of the present disclosure are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0186] In the present disclosure, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0187] In addition, in the present disclosure, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0188] Although embodiments of the present disclosure have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A projection device, characterized in that: The projection device comprises: A shell, wherein the shell has a first opening, and the shell and the first opening together form a cavity; An imaging component, the imaging component is arranged in the cavity to separate the cavity into a first cavity and a second cavity, a communication port connecting the first cavity and the second cavity is provided between the imaging component and the housing, and the first cavity is connected to the first opening; a lens assembly, wherein the lens assembly is disposed at the first opening; a light source assembly, wherein the light source assembly is disposed in the second cavity; a first fan, the first fan being disposed in the second cavity, the first fan being used to drive air flow in the cavity, and An opening and closing component is disposed at the communication port in an opening and closing manner, and is used to close and open the communication port.

2. The projection device according to claim 1, characterized in that: The communication port is located at a side of the imaging assembly adjacent to the lens assembly.

3. The projection device according to claim 1, characterized in that: The opening and closing assembly comprises: a support rod, the support rod comprising a first end and a second end opposite to each other, the first end and the second end being disposed on the housing; and, A baffle, the baffle being arranged on the support rod; In which, the support rod is rotatably disposed on the shell or the baffle is rotatably disposed on the support rod, and when the connecting port is closed, the ends of the baffle are respectively docked or overlapped with the shell and the imaging component, and when the connecting port is opened, at least the end of the baffle is separated from the imaging component.

4. The projection device according to claim 3, characterized in that: When the communication port is opened, the blocking piece can be rotated to fit with the housing.

5. The projection device according to claim 3, characterized in that: The opening and closing assembly also includes: A driving member, when the support rod is rotatably disposed on the shell, the driving member is connected to the support rod, and the driving member is used to drive the support rod to rotate; or, when the baffle is rotatably disposed on the support rod, the driving member is used to drive the baffle to rotate.

6. The projection device according to claim 5, characterized in that: The driving member is a motor, which is connected to the support rod and is used to drive the support rod to rotate; or the driving member is an electromagnetic switch, which is used to magnetically attract the baffle to rotate the baffle.

7. The projection device according to claim 6, characterized in that: The blocking piece includes at least two split blocking pieces, and the opening and closing assembly includes electromagnetic switches corresponding to the number of the split blocking pieces. The electromagnetic switches and the split blocking pieces are arranged on the housing in a one-to-one correspondence.

8. The projection device according to claim 5, characterized in that: The opening and closing assembly also includes: A transmission member is connected to the driving member, and the transmission member is also connected to the support rod or the blocking piece.

9. The projection device according to claim 5, characterized in that: The driving member is disposed in the cavity.

10. The projection device according to claim 5, characterized in that: The first end extends out of the cavity, the driving member is disposed outside the cavity, and the driving member is connected to the first end.

11. The projection device according to claim 5, characterized in that: The projection device also includes: A water mist detection component is used to detect the water mist state of the lens assembly, and the water mist detection component is electrically connected to the driving member.

12. The projection device according to claim 11, characterized in that: The water mist detection component comprises: a temperature and humidity sensor, the temperature and humidity sensor being disposed in the first cavity; and / or, A water mist detection camera is arranged on the inside of the shell or the outside of the shell, and the shooting range of the water mist detection camera covers the lens assembly.

13. The projection device according to any one of claims 3 to 12, characterized in that: The first end extends to the outside of the shell and is provided with a rotating handle, or the second end extends to the outside of the shell and is provided with a rotating handle.

14. The projection device according to claim 13, characterized in that: Sealing rings are respectively provided at the rotational connections between the first end and the second end and the housing.

15. The projection device according to claim 14, characterized in that: The joints of the projection device are provided with sealing pads and / or sealing matching structures.

16. The projection device according to claim 1, characterized in that: The shell is provided with a ventilation hole connected with the first cavity and / or the second cavity, and a dustproof net and a waterproof breathable membrane are provided at the ventilation hole.

17. The projection device according to claim 16, characterized in that: The dustproof net and the waterproof breathable membrane are both black.

18. The projection device according to claim 1, characterized in that: The lens assembly comprises an inner lens and an outer lens, the inner lens is located in the first cavity, the outer lens is located outside the cavity, and the inner lens and / or the outer lens are provided with a waterproof coating.

19. The projection device according to claim 18, characterized in that: The lens assembly also includes a lens barrel, the inner lens and the outer lens are respectively arranged at two opposite ends of the lens barrel, and the lens barrel is filled with inert gas.

20. A projection system, characterized in that: The projection system comprises a projection screen and a projection device according to any one of claims 1 to 19, wherein the projection screen is used to receive a projection image of the projection device.

Images