Optical Engine and Laser Projection Device

Abstract

The present application discloses an optical engine and a laser projection device, belonging to the technical field of laser projection. The optical engine includes: a housing, a cooling fan, a controller, and a first temperature detector. After the current operating temperature of the optical engine detected by the first temperature detector is higher than the temperature threshold, the optical engine can control the cooling fan to blow air through the controller. The air blown by the cooling fan can enter the housing through the air inlet of the housing and be discharged from the air outlet of the housing. The operating temperature of the components located inside the housing is effectively reduced, and thus the operating temperature of the optical engine is relatively low.

Description

Technical Field

[0001] This application relates to the technical field of laser projection, and particularly to an optical engine and a laser projection device. Background Art

[0002] A laser projection system includes a projection screen and a laser projection device. The laser projection device can project an image on the projection screen to implement functions such as video playback.

[0003] Currently, the laser projection device generally includes a laser projection lens, an optical engine, etc. The optical engine generally includes a housing and components located inside the housing. The components generally include an illumination component, a galvanometer scanner, etc. When the laser projection device is working, the optical engine usually generates a large amount of heat. Therefore, a metal material with strong heat conduction can be used to prepare the housing of the optical engine. When the optical engine is working, the heat generated by the components inside the housing can be conducted out through the metal housing, thereby reducing the working temperature of the optical engine.

[0004] However, currently, in order to prevent external dust from entering the housing of the optical engine and affecting the display effect of the image projected by the laser projection device, the housing of the optical engine needs to be made into a sealed housing. In this way, after the optical engine works for a long time, the heat generated by the components inside the housing is difficult to dissipate through the metal housing, resulting in a relatively high working temperature of the optical engine, and further resulting in relatively low reliability of the components inside the housing, and ultimately resulting in a poor display effect of the image projected by the laser projection device. Summary of the Invention

[0005] Embodiments of this application provide an optical engine and a laser projection device. The problem of poor display effect of the image projected by the existing laser projection device can be solved. The technical solutions are as follows:

[0006] On the one hand, an optical engine is provided, including:

[0007] A housing having an air inlet and an air outlet;

[0008] And a cooling fan, a controller, and a first temperature detector located outside the housing and connected to the housing;

[0009] Wherein, the air outlet surface of the cooling fan faces the air inlet, the controller is electrically connected to the cooling fan and the first temperature detector respectively, and the controller is configured to: after determining that the current working temperature of the optical engine detected by the first temperature detector is higher than the temperature threshold, control the cooling fan to blow air towards the air inlet.

[0010] On the other hand, a laser projection device is provided, including: an optical engine, and a projection lens connected to the optical engine, where the optical engine is the above-mentioned optical engine.

[0011] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0012] The optical engine includes: a housing, a cooling fan, a controller, and a first temperature detector. After the current operating temperature of the optical engine detected by the first temperature detector of the optical engine is higher than the temperature threshold, the optical engine can control the cooling fan to blow air through the controller. The air blown by the cooling fan can enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. In this way, the gas that will flow is located inside the housing, and the flowing gas can take out the heat generated when the components inside the housing work from the air outlet, effectively reducing the operating temperature of the components inside the housing. Furthermore, the operating temperature of the optical engine is relatively low, and the reliability of the components inside the housing can be effectively improved. As a result, the display effect of the image projected by the laser projection device where the optical engine is located is better. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0014] Figure 1 is a schematic structural diagram of an optical engine provided by an embodiment of the application;

[0015] Figure 2 is Figure 1 a schematic structural diagram of the optical engine shown on the other side;

[0016] Figure 3 is a schematic structural diagram of another optical engine provided by an embodiment of the application;

[0017] Figure 4 is Figure 3 an exploded view of the optical engine shown;

[0018] Figure 5 is a schematic structural diagram of the housing in an optical engine provided by an embodiment of the application;

[0019] Figure 6 is a structural block diagram of an optical engine provided by an embodiment of the application;

[0020] Figure 7It is an exploded view of a laser projection device provided by an embodiment of the present application;

[0021] Figure 8 It is a schematic structural diagram of a laser projection system provided by an embodiment of the present application. Detailed implementation manners

[0022] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe in detail the embodiments of the present application with reference to the accompanying drawings.

[0023] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of an optical engine provided by an embodiment of the application, Figure 2 is Figure 1 a schematic structural diagram of the optical engine shown on the other side.

[0024] The optical engine 000 may include: a housing 100, a cooling fan 200, a controller 300, and a first temperature detector 400.

[0025] The housing 100 in the optical engine 000 has an air inlet 101 and an air outlet 102.

[0026] The cooling fan 200, the controller 300, and the first temperature detector 400 in the optical engine 000 are all located outside the housing 100, and the cooling fan 200, the controller 300, and the first temperature detector 400 in the optical engine 000 are all connected to the housing 100.

[0027] Among them, the air outlet surface of the cooling fan 200 in the optical engine 000 may face the air inlet 101 of the housing 100.

[0028] The controller 300 in the optical engine 000 is electrically connected to the cooling fan 200 and the first temperature detector 400 respectively.

[0029] In the present application, since the first temperature detector 400 is connected to the housing 100, the first temperature detector 400 can detect the temperature of the housing 100 in the optical engine 000. Also, since the housing 100 in the optical engine 000 is usually made of a metal material with good thermal conductivity, when the optical engine 000 is working, the temperature of the housing 100 detected by the first temperature detector 400 in the optical engine 000 is the current working temperature of the optical engine 000.

[0030] The controller 300 in the optical engine 000 is configured to: after determining that the current operating temperature of the optical engine 000 detected by the first temperature detector 400 is higher than the temperature threshold, control the cooling fan 200 to blow air towards the air inlet 101 of the housing 100.

[0031] In the embodiment of the present application, when the laser projection device where the optical engine 000 is located is operating, the optical engine 000 can detect the current operating temperature of the optical engine 000 through the first temperature detector 400 in the optical engine 000. After determining through the controller 300 in the optical engine 000 that the current operating temperature of the optical engine 000 is higher than the temperature threshold, it can control the cooling fan 200 to blow air towards the air inlet 101 of the housing 100 to reduce the operating temperature of the optical engine 000.

[0032] In this case, the air blown by the cooling fan 200 in the optical engine 000 can enter the housing 100 through the air inlet 101 of the housing 100 in the optical engine 000 and be discharged from the air outlet 102 of the housing 100. In this way, the gas that will flow inside the housing 100 can carry the heat generated when the components inside the housing 100 are working out of the housing 100 from the air outlet 102, effectively reducing the operating temperature of the components inside the housing 100. Furthermore, the operating temperature of the optical engine 000 is relatively low, and the reliability of the components inside the housing 100 can be effectively improved. As a result, the display effect of the image projected by the laser projection device where the optical engine 000 is located is better.

[0033] In summary, the optical engine provided by the embodiment of the present application includes: a housing, a cooling fan, a controller, and a first temperature detector. After the optical engine detects that the current operating temperature of the optical engine detected by the first temperature detector is higher than the temperature threshold, the optical engine can control the cooling fan to blow air through the controller. The air blown by the cooling fan can enter the housing through the air inlet of the housing and be discharged from the air outlet of the housing. In this way, the gas that will flow inside the housing can carry the heat generated when the components inside the housing are working out of the housing from the air outlet, effectively reducing the operating temperature of the components inside the housing. Furthermore, the operating temperature of the optical engine is relatively low, and the reliability of the components inside the housing can be effectively improved. As a result, the display effect of the image projected by the laser projection device where the optical engine is located is better.

[0034] In the embodiment of the present application, as Figure 3 shown, Figure 3It is a schematic structural diagram of another optical engine provided by an embodiment of the present application. The optical engine 000 may further include: an anti-dust filtering component 500 connected to the housing 100. The anti-dust filtering component 500 in the optical engine 000 is located at the opening of the housing 100 and is used to protect the opening of the housing 100 from dust, preventing tiny particles such as dust from the outside from entering the housing 100 through the opening of the housing 100.

[0035] Exemplarily, the anti-dust filtering component 500 in the optical engine 000 may include: a first ventilation filter screen 501 connected to the air inlet 101 of the housing 100, and a second ventilation filter screen 502 connected to the air outlet 102 of the housing 100.

[0036] In the present application, both the first ventilation filter screen 501 and the second ventilation filter screen 502 can filter tiny particles such as dust, thereby preventing the tiny particles from entering the housing 100 through the air inlet 101 and the air outlet 102 of the housing 100. Furthermore, it avoids the phenomenon that the tiny particles enter the housing 100 and affect the operation of the components in the housing 100, and further improves the display effect of the picture projected by the laser projection device where the optical engine 000 is located. Moreover, both the first ventilation filter screen 501 and the second ventilation filter screen 502 are capable of ventilation. In this way, the air blown by the cooling fan 200 in the optical engine 000 can enter the housing 100 through the first ventilation filter screen 501 and be discharged from the housing 100 through the second ventilation filter screen 502, enabling the cooling fan 200 to reduce the operating temperature of the optical engine 000.

[0037] It should be noted that in the related art, since the housing in the optical engine is sealed, the optical engine needs to blow air into the sealed housing through a fan to reduce the operating temperature of the optical engine. However, in the embodiment of the present application, through the first ventilation filter screen 501 and the second ventilation filter screen 502 on the housing 100 of the optical engine 000, on the premise of preventing tiny particles from entering the housing 100 through the air inlet 101 and the air outlet 102 of the housing 100, the cooling fan 200 can directly blow air towards the first ventilation filter screen 501 on the housing 100 to blow air into the interior of the housing 100, thereby reducing the operating temperature of the optical engine 000. In this way, the embodiment of the present application reduces its operating temperature by directly blowing air into the interior of the housing 100 through the cooling fan 200. Compared with the method in the related art of blowing air towards the outside of the housing of the optical engine to reduce its operating temperature, the cooling method provided by the embodiment of the present application has higher cooling efficiency and is easier to control the operating temperature of the optical engine 000.

[0038] Optionally, as Figure 3 andFigure 4 As shown Figure 4 is Figure 3 an exploded view of the shown optical engine, in which the cooling fan 200 in the optical engine 000 may include: a fan bracket 201 fixedly connected to the housing 100, and a fan body 202 movably connected to the fan bracket 201.

[0039] Exemplarily, the fan bracket 201 in the cooling fan 200 may be fixedly connected to the housing 100 in the optical engine 000 through a plurality of fastening screws. For example, the fan bracket 201 has through holes corresponding one-to-one to the plurality of fastening screws, and the housing 100 also has a plurality of threaded holes corresponding one-to-one to the plurality of fastening screws. Each fastening screw may pass through the corresponding through hole in the fan bracket 201 and then be threadedly connected to the corresponding threaded hole in the housing 100, so that the fan bracket 201 is fixedly connected to the housing 100.

[0040] In this application, the cooling fan 200 may further include: a fan motor (not shown in the figure) connected to the fan body 202, and the fan motor in the cooling fan 200 may be electrically connected to the controller 300 in the optical engine 000.

[0041] Exemplarily, the fan motor in the cooling fan 200 has a drive shaft, and the drive shaft in the fan motor may be connected to the fan body 202 in the cooling fan 200. Thus, the controller 300 in the optical engine 000 may control the rotation of the drive shaft of the fan motor in the cooling fan 200 to drive the rotation of the fan body 202 in the cooling fan 200, so that the rotating fan body 202 can blow air towards the air inlet 101 of the housing 100.

[0042] Optionally, as Figure 3 and Figure 4 shown, the optical engine 000 may further include: a Digital Micromirror Device (DMD) 600, an illumination component (not shown in the figure), and a galvanometer (not shown in the figure).

[0043] In the embodiment of this application, the illumination component and the galvanometer in the optical engine 000 are both located inside the housing 100 and are connected to the housing 100. The digital micromirror device 600 in the optical engine 000 is located outside the housing 100 and is connected to the housing 100. Exemplarily, the housing 100 has a light passing hole (not shown in the figure). After the digital micromirror device 600 is connected to the housing 100, the light receiving surface 601 of the digital micromirror device 600 may face the light passing hole in the housing 100.

[0044] In this application, the illumination component in the optical engine 000 is used to provide an illumination beam; the digital micromirror device 600 in the optical engine 000 is used to modulate the illumination beam provided by the illumination component to form a modulated beam; the galvanometer in the optical engine 000 is usually arranged in the optical path between the digital micromirror device 600 and the projection lens, and the galvanometer is used to be driven electrically to move periodically in four positions, and the modulated beam after passing through the galvanometer enters the projection lens in sequence with a dislocation. Among them, the projection lens can be connected to the optical engine 000.

[0045] Exemplarily, as Figure 5 shown, Figure 5 FIG. is a schematic structural diagram of a housing in an optical engine provided by an embodiment of the present application. The housing 100 in the optical engine 000 has a plurality of positioning posts 103 connected to the projection lens.

[0046] In an embodiment of the present application, the projection lens may include: a lens mount, and a reflector and a plurality of lens groups located in the lens mount. The connection between the optical engine 000 and the projection lens is realized by connecting the housing 100 in the optical engine 000 with the lens mount in the projection lens. In this application, the connection manner between the housing 100 in the optical engine 000 and the lens mount in the projection lens is as follows:

[0047] The housing 100 in the optical engine 000 has a plurality of positioning posts 103, the lens mount in the projection lens has a plurality of positioning holes, and the plurality of positioning holes correspond to the plurality of positioning posts 103 one by one. Each positioning hole on the lens mount can be sleeved on the corresponding positioning post 103 on the housing 100 to realize the connection between the lens mount and the housing 100.

[0048] In order to improve the firmness of the connection between the lens mount and the housing 100, the lens mount and the housing 100 can be connected by a plurality of screws. Among them, the plurality of screws correspond to the plurality of positioning posts 103 in the housing 100 one by one, and correspond to the plurality of positioning holes in the lens mount one by one. Each positioning post 103 in the housing 100 has an internal thread. In this way, each screw can pass through the corresponding positioning hole on the lens mount and then be threadedly connected to the corresponding positioning post 103 in the housing 100, thereby realizing the connection between the lens mount and the housing 100, and ensuring a relatively high firmness of the connection between the lens mount and the housing 100.

[0049] In the related art, when a laser projection device is operating, both the projection lens and the optical engine in the laser projection device will experience thermal expansion as the operating temperature rises. Moreover, the amount of deformation of the projection lens after thermal expansion is usually different from that of the optical engine after thermal expansion, resulting in a change in the distance between the lens group in the projection lens and the light-receiving surface of the digital micromirror device in the optical engine. Consequently, the focal plane of the lens group in the projection lens shifts, and the projection lens exhibits a temperature drift phenomenon. Eventually, the projected image of the laser projection device will appear severely blurred and distorted, seriously affecting the user's viewing experience.

[0050] In the present application, in order to further improve the display effect of the image projected by the laser projection device where the optical engine 000 is located, it is necessary to ensure that the positional relationship between the light-receiving surface 601 of the digital micromirror device 600 in the optical engine 000 and the lens group in the projection lens always remains consistent. For example, it is necessary to ensure that the focal plane of the lens group in the projection lens is always located on the light-receiving surface 601 of the digital micromirror device 600.

[0051] To this end, it is necessary to ensure that when the laser projection device is operating, the amount of deformation of the optical engine 000 after thermal expansion matches the amount of deformation of the projection lens after thermal expansion, so that the distance by which the focal plane of the lens group in the projection lens moves towards the digital micromirror device 600 in the optical engine 000 after thermal expansion is the same as the distance by which the digital micromirror device 600 in the optical engine 000 moves away from the projection lens after thermal expansion. Furthermore, it can be ensured that the focal plane of the lens group in the projection lens is always located on the light-receiving surface 601 of the digital micromirror device 600, avoiding the temperature drift phenomenon of the projection lens, and further improving the display effect of the image projected by the laser projection device, resulting in a better viewing experience for the user.

[0052] It should be noted that since the magnitude of the deformation of the optical engine 000 after thermal expansion is related to the operating temperature of the optical engine 000, and the magnitude of the deformation of the projection lens after thermal expansion is also related to the operating temperature of the projection lens. Therefore, when it is necessary to match the amount of deformation of the optical engine 000 after thermal expansion with the amount of deformation of the projection lens after thermal expansion, it is only necessary to ensure that the operating temperature of the optical engine 000 matches the operating temperature of the laser projection device when the laser projection device is operating. That is to say, it is necessary to ensure that the operating temperature of the optical engine 000 corresponds to the operating temperature of the laser projection device.

[0053] It should also be noted that the corresponding relationship between the operating temperature of the optical engine 000 and the operating temperature of the laser projection device can be obtained in advance by performing a working simulation experiment on the laser projection device. For example, assume that the operating temperature of the projection lens is 45 °C (degrees Celsius). Then, when the operating temperature of the optical engine 000 is 50 °C, the distance by which the focal plane of the lens group moves towards the digital micromirror device 600 in the optical engine 000 after the projection lens expands due to heat is the same as the distance by which the digital micromirror device 600 in the optical engine 000 moves away from the projection lens after the optical engine 000 expands due to heat.

[0054] Therefore, in the embodiment of the present application, when the laser projection device where the optical engine 000 is located is operating, the controller 300 in the optical engine 000 not only needs to obtain the current operating temperature of the optical engine 000, but also needs to obtain the current operating temperature of the projection lens, so that the controller can adjust the rotation speed of the fan assembly 200 based on the current operating temperature of the optical engine 000 and the current operating temperature of the projection lens, so as to adjust the current operating temperature of the optical engine 000 to the operating temperature corresponding to the current operating temperature of the projection lens. In this way, it can be ensured that the distance by which the focal plane of the lens group in the projection lens moves towards the digital micromirror device 600 in the optical engine 000 after the projection lens expands due to heat is the same as the distance by which the digital micromirror device 600 in the optical engine 000 moves away from the projection lens after the optical engine 000 expands due to heat, so that the focal plane of the lens group in the projection lens is always located on the light-receiving surface 601 of the digital micromirror device 600, thereby ensuring that the display effect of the picture projected by the laser projection device is better.

[0055] Exemplarily, as Figure 6 shown, Figure 6 is a structural block diagram of an optical engine provided by an embodiment of the present application. The optical engine 000 may further include: a second temperature detector 700 electrically connected to the controller 300. The second temperature detector 700 is used to detect the operating temperature of the projection lens. In the present application, since the lens mount in the projection lens is usually made of plastic material and has poor thermal conductivity, in order to enable the second temperature detector 700 to more accurately detect the operating temperature of the projection lens, the second temperature detector 700 needs to be located inside the projection lens. For example, the second temperature detector 700 can be installed inside the lens mount of the projection lens. In this way, the temperature inside the lens mount detected by the second temperature detector 700 is the operating temperature of the projection lens.

[0056] In this application, when the laser projection device where the optical engine 000 is located is operating, the first temperature detector 400 in the optical engine 000 can send the currently detected operating temperature of the optical engine 000 to the controller 300. At the same time, the second temperature detector 700 in the optical engine 000 can send the currently detected operating temperature of the projection lens to the controller 300. The controller 300 can simultaneously receive the currently detected operating temperature of the optical engine 000 sent by the first temperature detector 400 and the currently detected operating temperature of the projection lens sent by the second temperature detector 700.

[0057] In this way, the controller 300 can be configured to: after determining that the currently detected operating temperature of the optical engine 000 detected by the first temperature detector 400 is higher than the temperature threshold, control the cooling fan 200 to blow air towards the air inlet 101 of the housing 100 to reduce the operating temperature of the optical engine 000. Moreover, the controller 300 can also be configured to: after controlling the cooling fan 200 to blow air towards the air inlet 101 of the housing 100, based on the currently detected operating temperature of the optical engine 000 detected by the first temperature detector 400 and the currently detected operating temperature of the projection lens detected by the second temperature detector 700, adjust the rotation speed of the cooling fan 200 to adjust the heat dissipation efficiency of the cooling fan 200 for the optical engine 000, so that the operating temperature of the optical engine 000 is reduced to the operating temperature corresponding to the currently detected operating temperature of the projection lens.

[0058] In an embodiment of this application, the controller 300 can be configured to: after detecting the currently detected operating temperature of the projection lens through the second temperature detector 700, determine the target operating temperature corresponding to the currently detected operating temperature of the projection lens according to the pre-determined correspondence between the operating temperature of the projection lens and the operating temperature of the optical engine 000, and based on the temperature difference between the currently detected operating temperature of the optical engine 000 and the target operating temperature, adjust the rotation speed of the cooling fan 200 to adjust the currently detected operating temperature of the optical engine 000 to the target operating temperature. Among them, the rotation speed of the cooling fan 200 is positively correlated with the temperature difference between the currently detected operating temperature of the optical engine 000 and the target operating temperature.

[0059] In this application, the corresponding relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000 is determined in advance through experiments, and this corresponding relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000 can be stored at a specified storage address in the controller 300. Thus, after the controller 300 detects the current operating temperature of the projection lens through the second temperature detector 700, it can determine the target operating temperature corresponding to the current operating temperature of the projection lens according to the stored corresponding relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000. After that, the controller 300 needs to lower the current operating temperature of the optical engine 000 to the target operating temperature by controlling the rotation speed of the cooling fan 200.

[0060] For example, after the controller 300 determines the target operating temperature corresponding to the current operating temperature of the projection lens, when it determines that the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature is large, the controller 300 can increase the rotation speed of the cooling fan 200 to increase the heat dissipation efficiency of the cooling fan 200 for the optical engine 000, so that the current operating temperature of the optical engine 000 can be quickly reduced to the target operating temperature. When it determines that the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature is small, the controller 300 can lower the rotation speed of the cooling fan 200 to reduce the heat dissipation efficiency of the cooling fan 200 for the optical engine 000, and avoid the phenomenon that the current operating temperature of the optical engine 000 is less than the target operating temperature due to the too fast reduction speed of the current operating temperature of the optical engine 000.

[0061] In other alternative implementation manners, the corresponding relationship between the rotation speed of the cooling fan 200 and the temperature difference between the current operating temperature and the target operating temperature of the optical engine 000 can be determined in advance, so that after the controller 300 determines the temperature difference between the current operating temperature and the target operating temperature of the optical engine 000, it can control the cooling fan 200 to rotate at a corresponding speed based on this corresponding relationship and this temperature difference, so that the cooling fan 200 can adjust the current operating temperature of the optical engine 000 to the target operating temperature faster.

[0062] Optionally, the controller 300 in the optical engine 000 is further configured to: during the adjustment of the operating temperature of the optical engine 000 by the cooling fan 200, if it is determined that the temperature change amount of the optical engine 000 within a specified duration is less than the temperature change threshold, the rotation speed of the cooling fan 200 is increased.

[0063] Exemplarily, during the adjustment of the operating temperature of the optical engine 000 by the cooling fan 200, the first temperature detector 400 in the optical engine 000 can continuously detect the current operating temperature of the optical engine 000. Therefore, the controller 300 in the optical engine 000 can determine whether the temperature change amount of the optical engine 000 is less than the temperature change threshold within a specified duration. When the controller 300 determines that the temperature change amount of the optical engine 000 is less than the temperature change threshold within the specified duration, it indicates that the cooling effect of the cooling fan 200 on the optical engine 000 is poor. At this time, the rotation speed of the cooling fan 200 can be increased to improve the cooling effect of the cooling fan 200 on the optical engine 000, so that the current operating temperature of the optical engine 000 can be lowered to the target operating temperature more quickly.

[0064] For example, assuming that the specified duration is 20 seconds and the temperature change threshold is 0.5 °C, during the adjustment of the operating temperature of the optical engine 000 by the cooling fan 200, when the controller 300 in the optical engine 000 determines through the first temperature detector 400 that the temperature change amount of the optical engine 000 is less than 0.5 °C within 20 seconds, the controller 300 can increase the rotation speed of the cooling fan 200 to improve the cooling effect of the cooling fan 200 on the optical engine 000.

[0065] Optionally, the controller 300 in the optical engine 000 is further configured to: after adjusting the current operating temperature of the optical engine 000 to the target operating temperature, the rotation speed of the cooling fan 200 can be lowered.

[0066] In the embodiment of the present application, after the cooling fan 200 in the optical engine 000 adjusts the current operating temperature of the optical engine 000 to the target operating temperature, the controller 300 in the optical engine 000 can lower the rotation speed of the cooling fan 200, so that the cooling fan 200 operates at a low rotation speed. The cooling fan 200 operating at a low rotation speed can not only prevent the operating temperature of the optical engine 000 from rising continuously, but also prevent the operating temperature of the optical engine 000 from decreasing, so that the operating temperature of the optical engine 000 is maintained at the target operating temperature.

[0067] It should be noted that after the current working temperature of the optical engine 000 is adjusted to the target working temperature, the rotation speed of the cooling fan 200 in the optical engine 000 can be positively correlated with the target working temperature, and the corresponding relationship between the rotation speed of the cooling fan 200 and the target working temperature can be obtained in advance through simulation experiments. In this way, after the current working temperature of the optical engine 000 is adjusted to the target working temperature, the controller 300 in the optical engine 000 can query the corresponding relationship between the rotation speed of the cooling fan 200 and the target working temperature, and based on this corresponding relationship, determine the specified rotation speed corresponding to the current working temperature of the optical engine 000, and adjust the rotation speed of the cooling fan 200 to the specified rotation speed, so as to maintain the working temperature of the optical engine 000 at the target working temperature.

[0068] It should also be noted that the above embodiments are all illustrative examples in which the current working temperature of the optical engine 000 is higher than the target working temperature corresponding to the current working temperature of the projection lens, and the cooling fan 200 in the optical engine 000 needs to dissipate heat from the optical engine 000. In other possible implementation manners, the current working temperature of the optical engine 000 may also be lower than the target working temperature corresponding to the current working temperature of the projection lens. In this case, the controller 300 in the optical engine 000 needs to control the cooling fan 200 to stop working, so that the current working temperature of the optical engine 000 rises to the target working temperature.

[0069] Optionally, the controller 200 in the optical engine 000 in the above embodiments may be: a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a modem, and other devices.

[0070] In summary, the optical engine provided by the embodiments of the present application includes: a housing, a cooling fan, a controller, and a first temperature detector. After the current working temperature of the optical engine detected by the first temperature detector is higher than the temperature threshold, the optical engine can control the cooling fan to blow air through the controller. The air blown by the cooling fan can enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. In this way, the gas inside the housing will flow, and the flowing gas can take the heat generated by the components inside the housing out of the housing from the air outlet, effectively reducing the working temperature of the components inside the housing, thereby making the working temperature of the optical engine relatively low, and effectively improving the reliability of the components inside the housing, and further making the display effect of the picture projected by the laser projection device where the optical engine is located better.

[0071] The embodiments of the present application also provide a laser projection device, such as Figure 7As shown Figure 7 is an exploded view of a laser projection device provided by an embodiment of the present application. The laser projection device may include: an optical engine 000, and a projection lens 001 connected to the optical engine 000. The optical engine 000 may be the optical engine 000 in the above embodiment. For example, the optical engine 000 may be Figure 1 , Figure 3 or Figure 6 the optical engine 000 shown

[0072] Exemplarily, the projection lens 001 may include: a lens mount, and a reflector and a plurality of lens groups located within the lens mount. Among them, the reflector is located on the side of the plurality of lens groups away from the optical engine 000. Each lens group may include: at least one convex lens and / or at least one concave lens.

[0073] In an embodiment of the present application, the laser projection device may further include: a light source assembly (not shown in the figure). Exemplarily, the light source assembly may include: a laser, a fluorescence wheel, a color filter wheel, and a reflection assembly, etc. The laser may be a blue laser. After the blue laser emits blue light, red light and green light are generated through the fluorescence wheel. Then, after the blue light, red light, and green light pass through the color filter wheel, they are reflected by the reflection assembly to the optical engine 000.

[0074] The optical engine 000 may include: an illumination assembly, a digital micromirror device, and a galvanometer. The illumination assembly is used to process the light beam input into the optical engine 000 into an illumination light beam; the digital micromirror device 600 is used to modulate the illumination light beam provided by the illumination assembly to form a modulated light beam; the galvanometer in the optical engine 000 is driven by electricity to perform periodic movement at four positions, and the modulated light beam after passing through the galvanometer enters the projection lens 001 in sequence with a dislocation.

[0075] The projection lens 001 may project and image the light beam adjusted by the optical engine 000 through a plurality of lens groups and a reflector.

[0076] An embodiment of the present application also provides a laser projection system, as Figure 8 shown Figure 8 is a schematic structural diagram of a laser projection system provided by an embodiment of the present application. The laser projection system may include: a laser projection device 1 and a projection screen 2. The laser projection device 1 may be the laser projection device shown in the above embodiment. The laser projection device 1 may emit light obliquely upward so that the laser projection device 1 can project a picture onto the projection screen 2.

[0077] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" means two or more, unless otherwise clearly defined.

[0078] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An optical engine, characterized in that, Comprising: A housing having an air inlet, an air outlet, and a light passing hole; A cooling fan, a controller, and a first temperature detector located outside the housing and connected to the housing; A second temperature detector electrically connected to the controller; And A digital micromirror device located outside the housing and connected to the housing, the light receiving surface of the digital micromirror device facing the light passing hole; Wherein, the air outlet surface of the cooling fan faces the air inlet, the controller is electrically connected to the cooling fan and the first temperature detector respectively, and the controller is configured to: after determining that the current operating temperature of the optical engine detected by the first temperature detector is higher than the temperature threshold, control the cooling fan to blow air towards the air inlet; The second temperature detector is located in a projection lens connected to the optical engine, and the controller is configured to: after detecting the current operating temperature of the projection lens through the second temperature detector, determine a target operating temperature corresponding to the current operating temperature of the projection lens according to a pre-determined correspondence between the operating temperature of the projection lens and the operating temperature of the optical engine, and based on the temperature difference between the current operating temperature of the optical engine and the target operating temperature, adjust the rotational speed of the cooling fan to adjust the current operating temperature of the optical engine to the target operating temperature, so that the distance by which the focal plane of the lens group moves towards the digital micromirror device after the projection lens expands due to heat is the same as the distance by which the digital micromirror device moves away from the projection lens after the optical engine expands due to heat, wherein the rotational speed of the cooling fan is positively correlated with the temperature difference.

2. The optical engine according to claim 1, wherein The controller is further configured to: after adjusting the current operating temperature of the optical engine to the target operating temperature, lower the rotational speed of the cooling fan.

3. The optical engine according to claim 1, wherein The controller is further configured to: during the process of adjusting the operating temperature of the optical engine, if it is determined that the temperature change amount of the optical engine within a specified duration is less than the temperature change threshold, increase the rotational speed of the cooling fan.

4. The optical engine according to any one of claims 1 to 3, wherein The optical engine further comprises: a first ventilation filter connected to the air inlet, and a second ventilation filter connected to the air outlet.

5. The optical engine according to any one of claims 1 to 3, wherein The cooling fan comprises: a fan bracket fixedly connected to the housing, and a fan body movably connected to the fan bracket.

6. The optical engine according to any one of claims 1 to 3, characterized in that The optical engine further comprises: a lighting assembly and a galvanometer located inside the housing and connected to the housing.

7. The optical engine according to any one of claims 1 to 3, wherein The housing has a plurality of positioning posts for connecting to the projection lens.

8. A laser projection device, characterized in that, Comprising: An optical engine, and a projection lens connected to the optical engine, the optical engine comprising: the optical engine according to any one of claims 1 to 7.

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