Projection device

Abstract

The utility model discloses a projection device which comprises a shell, a projection lens arranged on the shell, a projection light machine located in the shell, a projection device pose sensor and a fan controller. The plurality of cooling fans are arranged on the shell and used for cooling the internal space of the shell, and the cooling fans comprise a first fan of which the orientation is approximately parallel to the orientation of the projection lens and a second fan of which the orientation is approximately perpendicular to the orientation of the projection lens; the fan controller is connected with each cooling fan and used for controlling the first fan and the second fan according to the sensing result of the projection device pose sensor, so that when the current orientation of the projection lens is roughly parallel to the environment gravity direction, the cooling capacity of the first fan to the inner space of the shell is weakened, or the cooling capacity of the second fan to the inner space of the shell is reduced. And when the current orientation of the projection lens is approximately perpendicular to the environment gravity direction, the heat dissipation capability of the second fan to the internal space of the shell is enhanced. According to the invention, adaptive heat dissipation of the projection device can be realized without a complex structure.

Description

Technical Field

[0001] The present application relates to the display field, and in particular to a projection device. Background Art

[0002] Micro laser projectors are electronic products based on laser and micro-electric technology. They can minimize the size of the projector while maintaining the projection quality. They also have the advantages of less light loss, low power consumption, and easy portability. Micro laser projectors tend to heat up when used for a long time, so the heat dissipation function of micro laser projectors is extremely important.

[0003] In the prior art, the heat dissipation of projection equipment is mostly achieved by first obtaining data about the equipment itself and the external environment through different types of sensors, and then adjusting the heating, cooling and refrigeration components through the set cooling logic to make the machine run at an appropriate temperature.

[0004] However, the existing technology requires a large number of sensors and a specific heat dissipation structure, which is complex and cannot be applied to micro laser projectors, and thus cannot meet the adaptive heat dissipation requirements of projection devices with smaller spaces. Utility Model Content

[0005] The main technical problem solved by the present application is to provide a projection device, which can solve the problem that the prior art cannot meet the adaptive heat dissipation requirements of projection devices with smaller spaces.

[0006] The present application provides a projection device, comprising: a shell, a projection lens arranged on the shell, and a projection optical machine located in the shell, the projection optical machine projects image light outward through the projection lens; a plurality of heat dissipation fans arranged on the shell, for dissipating heat to the inner space of the shell, the heat dissipation fans comprising a first fan and a second fan; wherein the orientation of the first fan on the shell is substantially parallel to the orientation of the projection lens, and the orientation of the second fan on the shell is substantially perpendicular to the orientation of the projection lens; a projection device posture sensor, for sensing the current posture of the projection device to determine the relative state between the current orientation of the projection lens and the direction of environmental gravity; and a fan controller, connected to each heat dissipation fan, for controlling the first fan and the second fan according to the sensing result of the projection device posture sensor, so as to reduce the heat dissipation capacity of the first fan to the inner space of the shell when the current orientation of the projection lens is substantially parallel to the direction of environmental gravity, or to enhance the heat dissipation capacity of the second fan to the inner space of the shell when the current orientation of the projection lens is substantially perpendicular to the direction of environmental gravity.

[0007] There are multiple first fans, including an exhaust fan, and the direction of the exhaust fan is the same as the direction of the projection lens; when the current direction of the projection lens is roughly opposite to the direction of ambient gravity, the fan controller reduces the rotation speed of the exhaust fan in the first fan to weaken the heat dissipation capacity of the first fan to the internal space of the shell.

[0008] There are multiple first fans, including an exhaust fan, and the direction of the exhaust fan is opposite to the direction of the projection lens; when the current direction of the projection lens is roughly opposite to the direction of ambient gravity, the fan controller reduces the rotation speed of the exhaust fan in the first fan to weaken the heat dissipation capacity of the first fan to the internal space of the shell.

[0009] There are multiple first fans, including an intake fan, and the direction of the intake fan is opposite to the direction of the projection lens; when the current direction of the projection lens is approximately the same as the direction of ambient gravity, the fan controller reduces the rotation speed of the intake fan in the first fan to weaken the heat dissipation capacity of the first fan to the internal space of the shell.

[0010] There are multiple second fans, and the second fans include an intake fan, which is used to transport cold air to the internal space of the shell.

[0011] There are multiple second fans, including an intake fan and / or an exhaust fan; when the current orientation of the projection lens is approximately perpendicular to the direction of ambient gravity, the fan controller increases the rotation speed of the second fan to enhance the heat dissipation capacity of the second fan to the internal space of the shell.

[0012] The projection device further comprises a fan speed monitor; the fan speed monitor is used to monitor the speed of each cooling fan and send out an alarm message when a sudden change occurs in the speed and the duration of the sudden change exceeds a preset time threshold.

[0013] The projection device further comprises a temperature monitor; the temperature monitor is used to monitor the temperature of the inner space of the shell, and to send out an alarm message when the temperature exceeds a predetermined temperature threshold.

[0014] Among them, the projection device also includes an alarm; the alarm is connected to the fan speed monitor and / or the temperature monitor, and is used to issue an alarm prompt by emitting sound, vibration, light to the outside world or projecting a predetermined pattern through the projection device according to the alarm information sent by the fan speed monitor and / or the temperature monitor.

[0015] Among them, the projection device also includes a central controller; the central controller is connected to the fan speed monitor and / or the temperature monitor, and is used to reduce the speed of the corresponding cooling fan according to the alarm information issued by the fan speed monitor, and / or reduce the light output power of the projection light machine according to the alarm information issued by the temperature monitor.

[0016] The beneficial effect of the present application is as follows: the present application provides a projection device, which, by arranging multiple cooling fans on a shell and controlling the connected multiple cooling fans through a fan controller, can weaken the heat dissipation capacity of the first fan in the cooling fan to the internal space of the shell through the fan controller when the sensing result of the projection device posture sensor is that the current orientation of the projection lens is approximately parallel to the direction of environmental gravity, and can strengthen the heat dissipation capacity of the second fan in the cooling fan to the internal space of the shell through the fan controller when the sensing result of the projection device posture sensor is that the current orientation of the projection lens is approximately perpendicular to the direction of environmental gravity, thereby realizing adaptive heat dissipation of the projection device without the need for a complex structure, thereby meeting the adaptive heat dissipation requirements of projection devices with smaller spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the first embodiment of the projection device of the present application;

[0019] Figure 2 yes Figure 1 A top view of the projection device;

[0020] Figure 3 yes Figure 1 System architecture diagram of the projection device;

[0021] Figure 4 for Figure 1 A schematic diagram of an embodiment of the projection device in a suspended installation posture;

[0022] Figure 5 for Figure 1 A schematic diagram of another embodiment of the projection device when it is in a hanging installation posture;

[0023] Figure 6 yes Figure 5 A front view of the projection device;

[0024] Figure 7 is a schematic diagram of the three-dimensional structure of the second embodiment of the projection device of the present application;

[0025] Figure 8 yes Figure 7 Front view of the projection device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless otherwise clearly indicated above, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] It should be understood that the terms "include", "comprises" or any other variations used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0030] In the prior art, most of the heat dissipation of projection equipment is to obtain data about the equipment itself and the external environment through different types of sensors, and then adjust the heating, cooling and refrigeration components through the set cooling logic to make the machine run at an appropriate temperature. However, the prior art requires a large number of sensors and a specific heat dissipation structure, which is complex and cannot be applied to micro laser projectors, and thus cannot meet the heat dissipation requirements of projection devices with smaller spaces.

[0031] Based on the above situation, the present application provides a projection device, which can solve the problem that the prior art cannot meet the adaptive heat dissipation requirements of projection devices with smaller spaces.

[0032] To illustrate the specific structure of the projection device of the present application, please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a schematic diagram of the three-dimensional structure of the first embodiment of the projection device of the present application, Figure 2 yes Figure 1 A top view of the projection device. Figure 3 yes Figure 1 System architecture diagram of the projection device.

[0033] In this embodiment, the projection device 100 includes a housing 10, a projection lens 20 disposed on the housing 10, a projection optical machine 21 located in the housing 10, a plurality of cooling fans 30 disposed on the housing 10, a projection device posture sensor 40, and a fan controller 50. The projection optical machine 21 is used to transmit image light outward through the projection lens 20. The plurality of cooling fans 30 include a first fan and a second fan, the orientation of the first fan on the housing 10 is substantially parallel to the orientation of the projection lens 20, and the orientation of the second fan on the housing 10 is substantially perpendicular to the orientation of the projection lens 20. The projection device posture sensor 40 is used to sense the current posture of the projection device 100 to determine the relative state of the current orientation of the projection lens 20 and the direction of environmental gravity. The fan controller 50 is connected to each cooling fan 30, and is used to control the first fan and the second fan according to the sensing result of the projection device posture sensor 40, so as to weaken the heat dissipation capacity of the first fan to the internal space of the shell 10 when the current orientation of the projection lens 20 is roughly parallel to the direction of environmental gravity, or to strengthen the heat dissipation capacity of the second fan to the internal space of the shell 10 when the current orientation of the projection lens 20 is roughly perpendicular to the direction of environmental gravity.

[0034] In this embodiment, the projection device 100 is a micro laser projector.

[0035] In this embodiment, the current orientation of the projection lens 20 is substantially parallel to the direction of environmental gravity, which means that the current orientation of the projection lens 20 is substantially the same as or substantially opposite to the direction of environmental gravity. The orientation of the first fan on the housing 10 is substantially parallel to the orientation of the projection lens 20, which means that the orientation of the first fan on the housing 10 is substantially the same as or substantially opposite to the orientation of the projection lens 20.

[0036] In some implementations, the projection device posture sensor 40 includes a gravity sensor. The gravity sensor can measure the three-dimensional space vector of the projection device 100 in the direction of each coordinate axis of the space, thereby obtaining a sensing result reflecting the posture of the projection device 100.

[0037] For example, Figure 1As shown, the thickness direction of the projection device 100 is the z-axis, and the extending directions of the adjacent and perpendicular first and second sides of the housing 10 are the x-axis and the y-axis, respectively. When the projection device 100 is placed in a horizontal posture, the z-axis is parallel to the environmental gravity direction G, and the environmental gravity direction G is located in the negative direction of the z-axis. The x-axis and the y-axis are respectively perpendicular to the environmental gravity direction G, and the orientation T of the projection lens 20 is located in the negative direction of the y-axis and is perpendicular to the environmental gravity direction G. If the projection device posture sensor 40 detects that the environmental gravity direction G is located in the positive direction of the z-axis, the sensing result is that the projection device 100 has been flipped 180°, and the posture of the projection device 100 is thus known. Similarly, if the projection device posture sensor 40 detects that the environmental gravity direction G is parallel to the x-axis or the y-axis, the sensing result is that the projection device 100 has been flipped 90° to the left or 90° to the right, and the posture of the projection device 100 is thus known.

[0038] In this embodiment, the projection device 100 includes a central controller 60, which is respectively connected to the projection device posture sensor 40 and the fan controller 50, and is used to receive the sensing results transmitted by the projection device posture sensor 40, and control the fan controller 50 based on the sensing results, so that the fan controller 50 controls the rotation speeds of the first fan and the second fan according to the sensing results of the projection device posture sensor 40.

[0039] In some embodiments, the central controller 60 records the number, setting position and preset speed corresponding to different posture data of each cooling fan 30. After receiving the sensing result transmitted by the projection device posture sensor 40, the central controller 60 calculates the required speed of each cooling fan 30 under the corresponding posture data based on the sensing result, and transmits the corresponding speed control signal to the fan controller 50, so that the fan controller 50 adjusts the speed of each first fan and the second fan accordingly according to the speed control signal.

[0040] In some implementations, the fan controller 50 is a fan control chip, and the central controller 60 is a central processing chip.

[0041] In this embodiment, the housing 10 includes at least one air outlet and at least one air inlet, and a heat dissipation fan 30 is correspondingly disposed at each air outlet and each air inlet.

[0042] The heat dissipation fan 30 corresponding to the air outlet is an exhaust fan, and the direction of the exhaust fan is consistent with the air outlet direction of the corresponding air outlet, and is used to discharge the hot air in the internal space of the housing 10. The heat dissipation fan 30 corresponding to the air inlet is an intake fan, and the direction of the intake fan is consistent with the air inlet direction of the corresponding air inlet, and is used to deliver cold air to the internal space of the housing 10.

[0043] Among them, the number of air outlets and air inlets and the corresponding number of exhaust fans and air intake fans can be adjusted according to actual product requirements. For example, the number of air outlets and air inlets can be increased at the same time, or only the number of air outlets or air inlets can be increased. The number of air outlets and air inlets can also be reduced at the same time, or only the number of air outlets or air inlets can be reduced. This application does not limit this.

[0044] In this embodiment, the first fan only refers to the heat dissipation fan 30 whose direction is roughly parallel to the direction T of the projection lens 20, and its function is not limited. The first fan can be an exhaust fan or an intake fan. When the first fan is an exhaust fan, the direction of the exhaust fan can be the same as the direction T of the projection lens 20, or it can be opposite to the direction T of the projection lens 20, and this application does not limit this. When the first fan is an intake fan, the direction of the intake fan is opposite to the direction T of the projection lens 20.

[0045] In this embodiment, the second fan only refers to the heat dissipation fan 30 which is oriented substantially perpendicular to the direction T of the projection lens 20 , and its function is not limited. The second fan may be an exhaust fan or an intake fan, and this application does not limit this.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the housing 10 includes a first side, a second side, a third side and a fourth side, wherein the first side is adjacent to and perpendicular to the second side, the second side is adjacent to the third side, the third side is adjacent to the fourth side, the first side is arranged in parallel with the third side, and the second side is arranged in parallel with the fourth side. The projection lens 20 is arranged on the first side, and an air outlet 101 is respectively arranged at both ends of the projection lens 20, an air outlet 101 is arranged on the third side, and an air inlet 102 is respectively arranged on the second side and the fourth side.

[0047] In other embodiments, two air outlets 101 may be symmetrically arranged on the third side, which is not limited in the present application.

[0048] In this embodiment, the air outlet directions of the two air outlets 101 located on the first side are consistent with the direction T of the projection lens 20, and the directions of the two cooling fans 30 corresponding to the two air outlets 101 are the same as the direction T of the projection lens 20, and are both first fans 31. The air outlet direction of the air outlet 101 located on the third side is opposite to the direction T of the projection lens 20, and the direction of the cooling fans 30 corresponding to the air outlet 101 is opposite to the direction T of the projection lens 20, and are also first fans 31. The air inlet directions of the air inlets 102 located on the second side and the fourth side are perpendicular to the direction T of the projection lens 20, and are both second fans 32.

[0049] In a specific implementation scenario, such as Figure 1As shown, the projection device 100 is in a horizontal installation posture, the orientation T of the projection lens 20 is perpendicular to the ambient gravity direction G, the air outlet directions corresponding to the multiple air outlets 101 and the air inlet directions corresponding to the multiple air inlets 102 are in the horizontal direction, the orientations of the multiple first fans 31 and the second fans 32 are perpendicular to the ambient gravity direction G, and the sensing result of the projection device posture sensor 40 is that the current orientation T of the projection lens 20 is perpendicular to the ambient gravity direction G. Based on the sensing result, the central controller 60 sends a control signal to the fan controller 50 to maintain the current rotation speed, so that the fan controller 50 maintains the rotation speed of the multiple first fans 31 and the multiple second fans 32.

[0050] It can be understood that when the projection device 100 is in a horizontal installation posture, the direction of environmental gravity G has no effect on the exhaust of hot air and the intake of cold air, so there is no need to adjust the rotation speed of the heat dissipation fan 30 .

[0051] See also Figure 4 , Figure 4 for Figure 1 A schematic diagram of an embodiment of the projection device in a suspended installation posture. Figure 2 The top view shown can also be understood as Figure 4 Front view of the projection device.

[0052] In this embodiment, the projection device 100 is in a suspended installation posture and the direction T of the projection lens 20 is opposite to the direction G of the environmental gravity. The wind direction of the two air outlets 101 located on the first side together with the projection lens 20 is the same as the direction T of the projection lens 20. The directions of the first fans 31 corresponding to the two air outlets 101 are the same as the direction T of the projection lens 20 and opposite to the direction G of the environmental gravity. The wind direction of the air outlet 101 located on the third side is opposite to the direction T of the projection lens 20. The direction of the first fan 31 corresponding to the two air outlets 101 is opposite to the direction T of the projection lens 20 and the same as the direction G of the environmental gravity. The wind inlet direction of the air inlet 102 located on the second side and the fourth side is perpendicular to the direction T of the projection lens 20. The directions of the two corresponding second fans 32 are perpendicular to the direction T of the projection lens 20 and perpendicular to the direction G of the environmental gravity. The sensing result of the projection device posture sensor 40 is that the current orientation T of the projection lens 20 is opposite to the environmental gravity direction G. Based on the sensing result, the central controller 60 sends a control signal to reduce the speed of the first fan to the fan controller 50, so that the fan controller 50 reduces the speed of the multiple first fans 31, thereby reducing the heat dissipation capacity of the first fans 31 to the internal space of the housing 10. At the same time, the central controller 60 also sends a control signal to maintain or reduce the speed of the second fan to the fan controller 50, so that the fan controller 50 maintains or reduces the speed of the multiple second fans 32.

[0053] It can be understood that when the projection device 100 is in a suspended installation posture and the direction T of the projection lens 20 is opposite to the direction G of the ambient gravity, the projection lens 20 faces the roof, and the two air outlets 101 on the same side as the projection lens 20 both face upward, and the cold air enters the machine through the air inlet 102. After being heated by various heating components, the air temperature will rise, the volume will increase, and the density will decrease. The rising air will strengthen the air convection. At this time, in the air duct of the first fan 31 corresponding to the above two air outlets 101, there is a natural rising force that will accelerate the discharge of hot air, and the thrust requirement of the first fan 31 corresponding to the above two air outlets 101 will be reduced, so the rotation speed of the first fan 31 of this type can be reduced. At the same time, since the hot air is mainly discharged through the air outlet 101 located at the top, the air outlet 101 located on the third side and the corresponding first fan 31 have a smaller heat dissipation task, so the rotation speed of the first fan 31 can also be appropriately reduced.

[0054] It can be understood that when the hot air moves upward, a low pressure is formed in the internal space of the shell 10, which is different from the external air pressure. The existence of the pressure difference will cause the internal space of the shell 10 to automatically draw in cold air from the outside, thereby reducing the rotation speed of multiple second fans 32 at the same time.

[0055] It can be understood that when the sensing result is that the current orientation T of the projection lens 20 is opposite to the ambient gravity direction G, the fan controller 50 weakens the heat dissipation capacity of the multiple first fans 31 to the internal space of the shell 10, thereby reducing the power of the projection device 100 without affecting the overall heat dissipation requirements.

[0056] See also Figure 5 and Figure 6 , Figure 5 for Figure 1 A schematic diagram of another embodiment of the projection device in a suspended installation posture, Figure 6 yes Figure 5The front view of the projection device in FIG. 1 is a front view of the projection device in FIG. 1. In this embodiment, the projection device 100 is in a suspended installation posture and the direction T of the projection lens 20 is perpendicular to the direction G of the environmental gravity. The wind direction of the two air outlets 101 located on the first side together with the projection lens 20 is the same as the direction T of the projection lens 20, and the direction of the first fans 31 corresponding to the two air outlets 101 is the same as the direction T of the projection lens 20. The wind direction of the air outlet 101 located on the third side is opposite to the direction T of the projection lens 20, and the direction of the corresponding first fan 31 is opposite to the direction T of the projection lens 20. The wind inlet direction of the air inlet 102 located on the second side is perpendicular to the direction T of the projection lens 20, and the direction of the corresponding second fan 32 is perpendicular to the direction T of the projection lens 20 and the same as the direction G of the environmental gravity. The wind inlet direction of the air inlet 102 located on the fourth side is perpendicular to the direction T of the projection lens 20, and the direction of the corresponding second fan 32 is perpendicular to the direction T of the projection lens 20 and opposite to the direction G of the environmental gravity. The sensing result of the projection device posture sensor 40 is that the current orientation T of the projection lens 20 is perpendicular to the environmental gravity direction G. Based on the sensing result, the central controller 60 sends a control signal to the fan controller 50 to increase the speed of the second fan, so that the fan controller 50 increases the speed of the plurality of second fans 32, thereby enhancing the heat dissipation capacity of the second fans 32 to the internal space of the housing 10. At the same time, the central controller 60 also sends a control signal to the fan controller 50 to maintain or increase the speed of the first fan, so that the fan controller 50 maintains or increases the speed of the plurality of first fans 31.

[0057] It can be understood that when the projection device 100 is in a suspended installation posture and the direction T of the projection lens 20 is perpendicular to the environmental gravity direction G, the projection lens 20 faces the side of the room, and the air inlet 102 on the second side adjacent to the first side where the projection lens 20 is located has an air inlet direction downward. In the air duct of the second fan 32 corresponding to the second side air inlet 102, the flow direction of the cold air is the same as the environmental gravity direction G and opposite to the rising direction of the hot air. The entry of the cold air will be hindered by the hot air. Therefore, in order to ensure the delivery of the cold air, it is necessary to increase the speed of the second fan 32 corresponding to the second side. The air inlet direction of the air inlet 102 on the fourth side parallel to the second side is upward, and the flow direction of the cold air is opposite to the environmental gravity direction G and the same as the rising direction of the hot air. It will not be hindered by the hot air. However, since the air inlet of the air inlet 102 corresponding to the second side is affected, the total amount of cold air entering the internal space of the housing 10 will still be reduced to a certain extent. Therefore, in order to compensate for the problem of insufficient cold air entering, it is also necessary to increase the speed of the second fan 32 corresponding to the fourth side.

[0058] It is understandable that since the hot air is discharged through multiple first fans 31 that are perpendicular to the ambient gravity direction G at this time, it cannot be discharged quickly from the upper air duct. Therefore, in order to accelerate heat dissipation, the rotation speed of the multiple first fans 31 can also be appropriately increased.

[0059] It can be understood that when the sensing result is that the current orientation T of the projection lens 20 is perpendicular to the ambient gravity direction G, the fan controller 50 is used to enhance the heat dissipation capacity of the multiple second fans 32 to the internal space of the shell 10, so that when the cold air delivery is affected, the heat dissipation speed of the projection device 100 can be avoided from being reduced, thereby ensuring the heat dissipation effect.

[0060] Please refer to Figure 3 , Figure 7 and Figure 8 , Figure 7 is a schematic diagram of the three-dimensional structure of the second embodiment of the projection device of the present application, Figure 8 yes Figure 7 Front view of the projection device.

[0061] In this embodiment, the projection device 200 includes a housing 10 , a projection lens 20 disposed on the housing 10 , a projection optical engine 21 located in the housing 10 , a plurality of cooling fans 30 disposed on the housing 10 , a projection device posture sensor 40 and a fan controller 50 .

[0062] In this embodiment, the projection device 200 includes a central controller 60 , and the central controller 60 is connected to the projection device posture sensor 40 and the fan controller 50 respectively.

[0063] In this embodiment, the housing 10 includes at least one air outlet and at least one air inlet, and a heat dissipation fan 30 is correspondingly disposed at each air outlet and each air inlet.

[0064] Only the parts of this embodiment that are different from the first embodiment will be described below.

[0065] In this embodiment, the projection lens 20 is disposed on the first side, an air inlet 102 is disposed at each end of the projection lens 20 , an air inlet 102 is disposed on the third side, and an air outlet 101 is disposed on the second side and the fourth side.

[0066] In this embodiment, the air inlet direction of the two air inlets 102 located on the first side is opposite to the direction T of the projection lens 20, and the directions of the two cooling fans 30 corresponding to the two air inlets 102 are opposite to the direction T of the projection lens 20, and both are first fans 31. The air inlet direction of the air inlet 102 located on the third side is the same as the direction T of the projection lens 20, and the directions of the cooling fans 30 corresponding to the air inlet 102 are the same as the direction T of the projection lens 20, and both are first fans 31. The air outlet directions of the air outlets 101 located on the second side and the fourth side are perpendicular to the direction T of the projection lens 20, and both are second fans 32.

[0067] In this embodiment, the projection device 200 is in a suspended installation posture and the direction T of the projection lens 20 is the same as the direction G of the ambient gravity. The wind direction of the two air inlets 102 located on the first side together with the projection lens 20 is opposite to the direction T of the projection lens 20. The directions of the first fans 31 corresponding to the two air inlets 102 are opposite to the direction T of the projection lens 20 and the direction G of the ambient gravity. The wind direction of the air inlet 102 located on the third side is the same as the direction T of the projection lens 20. The direction of the first fans 31 corresponding to the two air inlets 102 is the same as the direction T of the projection lens 20 and the direction G of the ambient gravity. The wind direction of the air outlet 101 located on the second side and the fourth side is perpendicular to the direction T of the projection lens 20. The directions of the two corresponding second fans 32 are perpendicular to the direction T of the projection lens 20 and the direction G of the ambient gravity. The sensing result of the projection device posture sensor 40 is that the current orientation T of the projection lens 20 is the same as the environmental gravity direction G. Based on the sensing result, the central controller 60 sends a control signal to reduce the speed of the first fan to the fan controller 50, so that the fan controller 50 reduces the speed of the multiple first fans 31, thereby reducing the heat dissipation capacity of the first fans 31 to the internal space of the housing 10. At the same time, the central controller 60 also sends a control signal to maintain or reduce the speed of the second fan to the fan controller 50, so that the fan controller 50 maintains or reduces the speed of the multiple second fans 32.

[0068] It can be understood that when the projection device 200 is in a suspended installation posture and the direction T of the projection lens 20 is the same as the direction of environmental gravity G, the projection lens 20 faces the ground, and the air inlet directions of the two air inlets 102 on the same side as the projection lens 20 are both upward. In the air ducts of the two second fans 32 corresponding to the two air inlets 102 on the first side, the flow direction of the cold air is opposite to the direction of environmental gravity G and the same as the rising direction of the hot air, and the entry of the cold air will not be hindered by the hot air. In addition, in the air ducts corresponding to the above-mentioned two first fans 31, there is a natural rising force that accelerates the flow of hot air. Due to the existence of the internal and external pressure difference, the internal space of the housing 10 automatically draws in the cold air from the outside, so the thrust requirements for the first fans 31 corresponding to the above-mentioned two air inlets 102 will be reduced, and the rotation speed of multiple first fans 31 of this type can be reduced. At the same time, since the cold air mainly enters through the two air inlets 102 located at the bottom, the total amount of cold air entering the internal space of the shell 10 is large, and the air inlet 102 located on the third side and the corresponding first fan 31 have a smaller air intake task, so the rotation speed of the first fan 31 can also be appropriately reduced.

[0069] It can be understood that since the cold air entering the shell 10 is delivered at a faster speed, the hot air inside the shell 10 will also be squeezed by the cold air and discharged faster, so the rotation speeds of the multiple second fans 32 can be reduced at the same time.

[0070] It can be understood that when the sensing result is that the current orientation T of the projection lens 20 is the same as the ambient gravity direction G, the fan controller 50 weakens the heat dissipation capacity of the multiple first fans 31 to the internal space of the shell 10, thereby reducing the power of the projection device 100 without affecting the overall heat dissipation requirements.

[0071] Please refer to Figure 1 and Figure 3 In this embodiment, the projection device 100 further includes a fan speed monitor 33. The fan speed monitor 33 is used to monitor the speed of each cooling fan 30, and issue an alarm message when the speed suddenly changes and the duration of the sudden change exceeds a predetermined time threshold.

[0072] Each cooling fan 30 is connected to a fan speed monitor 33, and the fan speed monitor 33 transmits the speed of the cooling fan 30 through a pin at a specific frequency. In some specific implementations, the fan speed monitor 33 can be a Hall effect sensor, a photoelectric sensor, or an electromagnetic induction sensor, which is not limited in this application.

[0073] The sudden change in speed refers to that the actual speed of the cooling fan 30 is greater than the preset speed threshold, or when the duty cycle is set the same as that of the other cooling fans 30 , the actual speed is significantly higher than that of the other cooling fans 30 .

[0074] Specifically, if an air outlet 101 or an air inlet 102 is blocked, the most direct impact is that air stops flowing through the air outlet, which in turn causes the motor load of the cooling fan 30 corresponding to the air outlet to decrease, thereby causing the speed of the cooling fan 30 to increase. If the time for the sudden change in speed is not long, it indicates that the air outlet is only temporarily blocked. If the duration of the sudden change exceeds a predetermined time threshold, it indicates that the air outlet is blocked for a long time, and an alarm needs to be used to remind the outside world so that the projection device 100 can be manually processed.

[0075] In this embodiment, the central controller 60 is connected to the fan speed monitor 33 and is used to reduce the speed of the corresponding cooling fan 30 according to the alarm information sent by the fan speed monitor 33 .

[0076] In some implementations, after receiving the alarm information sent by the fan speed monitor 33 , the central controller 60 sends a control signal to reduce the fan speed to the fan controller 50 , so that the fan controller 50 reduces the speed of the corresponding cooling fan 30 .

[0077] It can be understood that by reducing the rotation speed of the cooling fan corresponding to the blocked air outlet through the central controller 60 and the fan controller 50, damage to the motor of the cooling fan 30 can be prevented.

[0078] Furthermore, the projection device 100 further includes a temperature monitor 70. The temperature monitor 70 is used to monitor the temperature of the internal space of the housing 10, and to issue an alarm message when the temperature exceeds a predetermined temperature threshold.

[0079] There may be multiple temperature monitors 70, which are respectively arranged at different positions of the housing 10 to monitor the temperature at different positions. In some embodiments, each air outlet 101 and each air inlet 102 are respectively provided with a temperature monitor 70, and the cooling effect of the cooling fan 30 is determined by monitoring the ambient temperature at each air outlet. In other embodiments, temperature monitors 70 are respectively provided near the power supply, the color wheel, the projection optical machine 21, and the projection lens 20 to collect the power supply temperature, the color wheel temperature, the laser temperature, and the ambient temperature, which is not limited in the present application.

[0080] The central controller 60 is connected to the temperature monitor 70 and is used to reduce the light output power of the projection light engine 21 according to the alarm information sent by the temperature monitor 70 .

[0081] It can be understood that by reducing the light output power of the projection light engine 21 through the central controller 60, heat generation can be reduced to prevent fires at the air outlet caused by heat accumulation, thereby reducing damage to components in the projection device 100 and subsequently improving the stability and service life of the projection device 100.

[0082] Furthermore, the projection device 100 also includes an alarm (not shown), which is connected to the fan speed monitor 33 and / or the temperature monitor 70, and is used to issue an alarm prompt by emitting sound, vibration, light to the outside world or projecting a predetermined pattern through the projection device based on the alarm information issued by the fan speed monitor 33 and / or the temperature monitor 70.

[0083] In some embodiments, the alarm is connected only to the fan speed monitor 33. In other embodiments, the alarm is connected only to the temperature monitor 70. In still other embodiments, the alarm is connected to both the fan speed monitor 33 and the temperature monitor 70, which is not limited in the present application.

[0084] Furthermore, the projection device 100 further includes a display 80. The display 80 is used to provide an interface for the operating system and the application, and to pop up an alarm window to remind the user when the air outlet is blocked.

[0085] The central controller 60 is connected to the display 80. After receiving the alarm information from the fan speed monitor 33 and / or the temperature monitor 70, the central controller 60 pops up an alarm window through the display 80 and displays the alarm information in the alarm window.

[0086] In response to the alarm window not being eliminated for a long time, the central controller 60 reduces the light output power of the projection light engine 21 .

[0087] It is understandable that if the alarm window is not cleared for a long time, it indicates that no one is currently handling the abnormality of the projection device 100. By reducing the light output power of the projection optical engine 21 through the central controller 60, the probability of damage to the projection device 100 can be reduced.

[0088] It is understandable that since the projection device 100 can be installed in many postures, if the projection device 100 is placed on the ground or on a table in a hanging posture, at least one air inlet 102 or at least one air outlet 101 may be blocked. Through the above-mentioned components that cooperate with each other, the cooling fan 30 or the projection optical engine 21 can be adjusted when the air outlet is blocked, thereby avoiding damage to the projection device 100.

[0089] In a specific implementation scenario, the process of determining whether the air outlet is blocked is as follows: first, an abnormal speed detection is performed through the fan speed monitor 33 to determine whether the speed of the heat dissipation fan 30 suddenly increases. In response to the central controller 60 receiving the alarm information sent by the fan speed monitor 33, the central controller 60 marks the heat dissipation fan 30 corresponding to the alarm information as a fan that may have air outlet blockage. Then, the current posture of the projection device 100 is sensed by the projection device posture sensor 40, and the sensing result is sent to the central controller 60. Based on the sensing result, the central controller 60 obtains the relative spatial position relationship between the projection lens 20 and the environmental gravity direction G, and determines whether there is an air outlet 101 or an air inlet 102 located in a position that is easily blocked in this installation posture. For example, when the projection lens 20 is facing the roof, if the third side opposite to the first side where the projection lens 20 is located is placed on the ground or on the desktop, the bottom of the projection device 100 may be blocked. Then, the temperature of the internal space of the housing 10 is detected by the temperature monitor 70 to determine whether the actual temperature exceeds the predetermined temperature threshold. In response to the central controller 60 receiving the alarm information sent by the temperature monitor 70, it is determined that the marked heat dissipation fan 30 is a fan with a blocked air outlet.

[0090] In another specific implementation scenario, after determining that the air outlet is blocked, the central controller 60 and the fan controller 50 first reduce the speed of the cooling fan 30 corresponding to the blocked air outlet. Secondly, an alarm window pops up through the display 80, and the alarm information is displayed in the alarm window. Finally, in response to the alarm window not being eliminated for a long time, the central controller 60 reduces the light output power of the projection light machine 21.

[0091] Different from the prior art, the present application sets a plurality of cooling fans on the housing, and controls the connected plurality of cooling fans through a fan controller, so that when the sensing result of the projection device posture sensor is that the current orientation of the projection lens is roughly parallel to the direction of environmental gravity, the fan controller can be used to weaken the heat dissipation capacity of the first fan in the cooling fan to the internal space of the housing, and when the sensing result of the projection device posture sensor is that the current orientation of the projection lens is roughly perpendicular to the direction of environmental gravity, the fan controller can be used to strengthen the heat dissipation capacity of the second fan in the cooling fan to the internal space of the housing, thereby realizing adaptive heat dissipation of the projection device without the need for a complex structure, and then meeting the adaptive heat dissipation requirements of projection devices with smaller spaces. Furthermore, by setting a fan speed monitor, a temperature monitor, and a central controller, it is possible to automatically judge whether the air outlet is blocked, and after determining that the air outlet is blocked, the speed of the cooling fan and the power of the projection optical machine are adjusted, thereby reducing the probability of damage to the projection device, thereby improving the stability and service life of the projection device.

[0092] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A projection device, characterized in that: include: A housing, a projection lens disposed on the housing, and a projection light engine located in the housing, wherein the projection light engine projects image light outward through the projection lens; A plurality of cooling fans are arranged on the housing and used for cooling the interior space of the housing, the cooling fans comprising a first fan and a second fan; wherein the orientation of the first fan on the housing is substantially parallel to the orientation of the projection lens, and the orientation of the second fan on the housing is substantially perpendicular to the orientation of the projection lens; A projection device posture sensor, used to sense the current posture of the projection device to determine the relative state between the current orientation of the projection lens and the direction of environmental gravity; and A fan controller is connected to each of the cooling fans and is used to control the first fan and the second fan according to the sensing result of the projection device posture sensor, so as to weaken the heat dissipation capacity of the first fan to the internal space of the shell when the current orientation of the projection lens is roughly parallel to the direction of environmental gravity, or to strengthen the heat dissipation capacity of the second fan to the internal space of the shell when the current orientation of the projection lens is roughly perpendicular to the direction of environmental gravity.

2. The projection device according to claim 1, characterized in that: There are a plurality of first fans, the first fans include an exhaust fan, and the direction of the exhaust fan is the same as the direction of the projection lens; When the current orientation of the projection lens is substantially opposite to the direction of the ambient gravity, the fan controller reduces the rotation speed of the exhaust fan in the first fan to reduce the heat dissipation capability of the first fan to the inner space of the housing.

3. The projection device according to claim 1, characterized in that: There are a plurality of first fans, the first fans include an exhaust fan, and the direction of the exhaust fan is opposite to the direction of the projection lens; When the current orientation of the projection lens is substantially opposite to the direction of the ambient gravity, the fan controller reduces the rotation speed of the exhaust fan in the first fan to reduce the heat dissipation capability of the first fan to the inner space of the housing.

4. The projection device according to claim 1, characterized in that: There are a plurality of first fans, and the first fans include an intake fan, and the direction of the intake fan is opposite to the direction of the projection lens; When the current orientation of the projection lens is substantially the same as the direction of the ambient gravity, the fan controller reduces the rotation speed of the intake fan in the first fan to reduce the heat dissipation capability of the first fan for the inner space of the housing.

5. The projection device according to any one of claims 2 to 4, characterized in that: There are multiple second fans, and the second fans include an intake fan, which is used to transport cold air to the inner space of the shell.

6. The projection device according to claim 1, characterized in that: There are multiple second fans, and the second fans include intake fans and / or exhaust fans; When the current orientation of the projection lens is substantially perpendicular to the direction of the ambient gravity, the fan controller increases the rotation speed of the second fan to enhance the heat dissipation capability of the second fan for the inner space of the housing.

7. The projection device according to any one of claims 1 to 6, characterized in that: The projection device also includes a fan speed monitor; The fan speed monitor is used to monitor the speed of each of the cooling fans and issue an alarm message when a sudden change occurs in the speed and the duration of the sudden change exceeds a preset time threshold.

8. The projection device according to claim 7, characterized in that: The projection device also includes a temperature monitor; The temperature monitor is used to monitor the temperature of the internal space of the shell, and to issue the alarm message when the temperature exceeds a predetermined temperature threshold.

9. The projection device according to claim 8, characterized in that: The projection device also includes an alarm; The alarm is connected to the fan speed monitor and / or the temperature monitor, and is used to issue an alarm prompt by emitting sound, vibration, light to the outside world or projecting a predetermined pattern through the projection device according to the alarm information issued by the fan speed monitor and / or the temperature monitor.

10. The projection device according to claim 8, characterized in that: The projection device also includes a central controller; The central controller is connected to the fan speed monitor and / or the temperature monitor, and is used to reduce the speed of the corresponding cooling fan according to the alarm information issued by the fan speed monitor, and / or reduce the light output power of the projection light machine according to the alarm information issued by the temperature monitor.

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