CN112731748A - Optical engine and laser projection equipment - Google Patents

Optical engine and laser projection equipment Download PDF

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Publication number
CN112731748A
CN112731748A CN202011619634.7A CN202011619634A CN112731748A CN 112731748 A CN112731748 A CN 112731748A CN 202011619634 A CN202011619634 A CN 202011619634A CN 112731748 A CN112731748 A CN 112731748A
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CN
China
Prior art keywords
optical engine
temperature
controller
operating temperature
fan
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011619634.7A
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Chinese (zh)
Inventor
周伯禹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hisense Laser Display Co Ltd
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Qingdao Hisense Laser Display Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Qingdao Hisense Laser Display Co Ltd filed Critical Qingdao Hisense Laser Display Co Ltd
Priority to CN202011619634.7A priority Critical patent/CN112731748A/en
Publication of CN112731748A publication Critical patent/CN112731748A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/145—Housing details, e.g. position adjustments thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3144—Cooling systems

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)

Abstract

The application discloses optical engine and laser projection equipment belongs to laser projection technical field. The optical engine includes: the temperature sensor comprises a shell, 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 may control the heat dissipation fan to blow air through the controller, and the air blown by the heat dissipation fan may enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. The working temperature of the components inside the shell is effectively reduced, and the working temperature of the optical engine is lower.

Description

Optical engine and laser projection equipment
Technical Field
The application relates to the technical field of laser projection, in particular to an optical engine and laser projection equipment.
Background
The laser projection system comprises a projection screen and a laser projection device, wherein the laser projection device can project pictures on the projection screen to realize the functions of video playing and the like.
Currently, the laser projection apparatus generally includes: laser projection lens, optical engine, etc. The optical engine may generally include: the shell and the components and parts located in the shell. The components typically include a lighting assembly, a galvanometer, and the like. The optical engine typically generates a significant amount of heat during operation of the laser projection device. Therefore, the shell of the optical engine can be made of a metal material with high heat conduction performance, and when the optical engine works, heat generated by components inside the shell can be led out through the metal shell, so that the working temperature of the optical engine can be reduced.
However, in order to avoid the phenomenon that the display effect of the picture projected by the laser projection device is affected by the external dust entering the housing of the optical engine, the housing of the optical engine needs to be a sealed housing. Therefore, after the optical engine works for a long time, heat generated by components inside the shell is difficult to dissipate through the metal shell, the working temperature of the optical engine is high, the reliability of elements inside the shell is low, and the display effect of a picture projected by the laser projection equipment is poor.
Disclosure of Invention
The embodiment of the application provides an optical engine and laser projection equipment. The problem that the display effect of the picture projected by the laser projection equipment in the prior art is poor can be solved, and the technical scheme is as follows:
in one aspect, an optical engine is provided, including:
a housing having an air inlet and an air outlet;
the heat dissipation fan, the controller and the first temperature detector are positioned outside the shell and connected with the shell;
wherein, the air-out face of radiator fan is towards the air intake, the controller respectively with radiator fan and the first temperature detector electricity be connected, the controller is configured to: and after the current working temperature of the optical engine detected by the first temperature detector is determined to be higher than a temperature threshold value, controlling the cooling fan to blow air to the air inlet.
In another aspect, there is provided a laser projection apparatus including: the optical engine and the projection lens are connected with the optical engine, and the optical engine is the optical engine.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the optical engine includes: the temperature sensor comprises a shell, 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 may control the heat dissipation fan to blow air through the controller, and the air blown by the heat dissipation fan may enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. So, be located the inside gas that can produce the flow of this casing, the casing can be taken away from the air outlet to the heat that this flowing gas can produce the inside components and parts during operation of this casing, the effectual operating temperature who is located the inside components and parts of this casing that has reduced, and then make the operating temperature of this optical engine lower, and can effectual improvement be located the reliability of the inside components and parts of this casing, and then make the display effect of the picture that laser projection equipment at this optical engine place throws better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an optical engine according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of the optical engine shown in FIG. 1 on the other side;
FIG. 3 is a schematic structural diagram of another optical engine provided in the embodiments of the present application;
FIG. 4 is an exploded view of the optical engine shown in FIG. 3;
fig. 5 is a schematic structural diagram of a housing in an optical engine according to an embodiment of the present disclosure;
FIG. 6 is a block diagram of an optical engine according to an embodiment of the present disclosure;
FIG. 7 is an exploded view of a laser projection device provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a laser projection system according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an optical engine according to an embodiment of the present disclosure, and fig. 2 is a schematic structural diagram of the optical engine shown in fig. 1 on another side.
The optical engine 000 may include: a case 100, a heat radiating fan 200, a controller 300, and a first temperature detector 400.
The housing 100 of the optical engine 000 has an inlet 101 and an outlet 102.
The heat dissipation 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 heat dissipation fan 200, the controller 300, and the first temperature detector 400 in the optical engine 000 are all connected to the housing 100.
The air outlet surface of the cooling fan 200 in the optical engine 000 may face the air inlet 101 of the housing 100.
The controller 300 in the optical engine 000 is electrically connected to the heat dissipation fan 200 and the first temperature detector 400, respectively.
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. Since the housing 100 of the optical engine 000 is usually made of a metal material with a good thermal conductivity, when the optical engine 000 is in operation, the temperature of the housing 100 detected by the first temperature detector 400 of the optical engine 000 is the current operating temperature of the optical engine 000.
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, the heat dissipation fan 200 is controlled to blow air towards the air inlet 101 of the housing 100.
In this embodiment, when the laser projection apparatus in which the optical engine 000 is located operates, the optical engine 000 may detect the current operating temperature of the optical engine 000 through the first temperature detector 400 in the optical engine 000, and after determining that the current operating temperature of the optical engine 000 is higher than the temperature threshold value through the controller 300 in the optical engine 000, the heat dissipation fan 200 may be controlled to blow air to the air inlet 101 of the housing 100, so as to reduce the operating temperature of the optical engine 000.
In this case, the air blown by the heat dissipation fan 200 in the optical engine 000 can enter the housing 100 from the air inlet 101 of the housing 100 in the optical engine 000, and can be discharged from the air outlet 102 of the housing 100. Thus, the gas inside the casing 100 can generate flowing gas, the flowing gas can bring heat generated during operation of the components inside the casing 100 out of the casing 100 from the air outlet 102, the operating temperature of the components inside the casing 100 is effectively reduced, the operating temperature of the optical engine 000 is lower, the reliability of the components inside the casing 100 can be effectively improved, and the display effect of the picture projected by the laser projection equipment where the optical engine 000 is located is better.
In summary, the optical engine provided in the embodiment of the present application includes: the temperature sensor comprises a shell, 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 may control the heat dissipation fan to blow air through the controller, and the air blown by the heat dissipation fan may enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. So, be located the inside gas that can produce the flow of this casing, the casing can be taken away from the air outlet to the heat that this flowing gas can produce the inside components and parts during operation of this casing, the effectual operating temperature who is located the inside components and parts of this casing that has reduced, and then make the operating temperature of this optical engine lower, and can effectual improvement be located the reliability of the inside components and parts of this casing, and then make the display effect of the picture that laser projection equipment at this optical engine place throws better.
In the embodiment of the present application, as shown in fig. 3, fig. 3 is a schematic structural diagram of another optical engine provided in the embodiment of the present application. The optical engine 000 may further include: the dust-proof filter assembly 500 is connected to the housing 100, and the dust-proof filter assembly 500 in the optical engine 000 is located at the opening in the housing 100 for protecting the opening of the housing 100 from dust and preventing external fine particles such as dust from entering the housing 100 through the opening of the housing 100.
For example, the dust-proof filter assembly 500 in the optical engine 000 may include: a first ventilating filter 501 connected to the air inlet 101 of the housing 100, and a second ventilating filter 502 connected to the air outlet 102 of the housing 100.
In this application, this first ventilation filter screen 501 and second ventilation filter screen 502 all can filter the tiny particulate matter such as dust to can prevent that this tiny particulate matter from getting into this casing 100 from the air intake 101 and the air outlet 102 of casing 100 in, and then avoided appearing this tiny particulate matter and got into the phenomenon that causes the influence to the work of components and parts in this casing 100 in the casing 100, further improvement the display effect of the picture that the laser projection equipment that this optical engine 000 belongs to throws out. Moreover, the first ventilation filter 501 and the second ventilation filter 502 are both capable of ventilating, so that the air blown by the cooling fan 200 in the optical engine 000 can enter the housing 100 through the first ventilation filter 501 and be discharged from the housing 100 through the second ventilation filter 502, so that the cooling fan 200 can reduce the operating temperature of the optical engine 000.
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 to the sealed housing by a fan to reduce the operating temperature of the optical engine. In the embodiment of the present application, the first ventilation filter 501 and the second ventilation filter 502 on the housing 100 in the optical engine 000 can directly face the first ventilation filter 501 on the housing 100 through the heat dissipation fan 200 to blow air to the inside of the housing 100 on the premise of preventing the micro particles from entering the housing 100 from the air inlet 101 and the air outlet 102 of the housing 100, so as to reduce the operating temperature of the optical engine 000. In this way, in the embodiment of the present application, the cooling fan 200 directly blows air to the inside of the casing 100 to reduce the operating temperature thereof, and compared with a method in the related art in which a fan blows air to the outside of the casing of the optical engine to reduce the operating temperature thereof, the cooling method provided in the embodiment of the present application has a higher cooling efficiency, and is easier to control the operating temperature of the optical engine 000.
Alternatively, as shown in fig. 3 and 4, fig. 4 is an exploded view of the optical engine shown in fig. 3, and the heat dissipation fan 200 in the optical engine 000 may include: a fan bracket 201 fixedly connected with the casing 100, and a fan body 202 movably connected with the fan bracket 201.
For example, the fan bracket 201 of the heat dissipation fan 200 may be fastened to the housing 100 of the optical engine 000 by a plurality of fastening screws. For example, the fan bracket 201 has through holes corresponding to the fastening screws one by one, and the housing 100 also has threaded holes corresponding to the fastening screws one by one. Each fastening screw can be threaded into a corresponding threaded hole in the casing 100 after passing through a corresponding through hole in the fan bracket 201, so that the fan bracket 201 is fixedly connected with the casing 100.
In this application, the heat dissipation fan 200 may further include: a fan motor (not shown) connected to the fan body 202, wherein the fan motor in the heat dissipation fan 200 can be electrically connected to the controller 300 in the optical engine 000.
Illustratively, the fan motor of the heat dissipation fan 200 has a driving shaft, and the driving shaft of the fan motor may be connected to the fan body 202 of the heat dissipation fan 200. In this way, the controller 300 in the optical engine 000 can control the driving shaft of the fan motor in the heat fan 200 to rotate, so as to drive the fan body 202 in the heat fan 200 to rotate, so that the rotating fan body 202 can blow air towards the air inlet 101 of the housing 100.
Optionally, as shown in fig. 3 and 4, the optical engine 000 may further include: a Digital Micromirror Device (DMD) 600, an illumination assembly (not shown) and a galvanometer (not shown).
In the embodiment of the present application, the illumination assembly and the galvanometer in the optical engine 000 are both located in the housing 100 and connected to the housing 100. The dmd 600 in the optical engine 000 is located outside the housing 100 and connected to the housing 100. For example, the housing 100 has a light hole (not shown), and the light receiving surface 601 of the dmd 600 may face the light hole in the housing 100 after the dmd 600 is connected to the housing 100.
In the present application, the illumination assembly in the optical engine 000 is used to provide an illumination beam; the digital micromirror device 600 in the optical engine 000 is used for modulating the illumination light beam provided by the illumination assembly with an image signal to form a modulated light beam; the galvanometer in the optical engine 000 is usually disposed in the optical path between the dmd 600 and the projection lens, and the galvanometer is electrically driven to perform periodic movement at four positions, and modulated light beams passing through the galvanometer sequentially enter the projection lens in a staggered manner. Wherein the projection lens may be connected to the optical engine 000.
For example, as shown in fig. 5, fig. 5 is a schematic structural diagram of a housing in an optical engine according to an embodiment of the present disclosure. The housing 100 of the optical engine 000 has a plurality of positioning posts 103 connected to the projection lens.
In an embodiment of the present application, the projection lens may include: the lens holder, and the speculum and a plurality of lens group of being located in the lens holder. The connection between the optical engine 000 and the projection lens is realized by the connection between the housing 100 in the optical engine 000 and the lens mount in the projection lens. In the present application, the connection between the housing 100 in the optical engine 000 and the lens mount in the projection lens is as follows:
the housing 100 of the optical engine 000 has a plurality of positioning posts 103, the lens holder of the projection lens has a plurality of positioning holes, and the positioning holes correspond to the positioning posts 103 one by one. Each positioning hole on the lens mount can be sleeved on the corresponding positioning column 103 on the housing 100 to realize the connection between the lens mount and the housing 100.
In order to improve the firmness of the connection between the lens holder and the housing 100, the lens holder and the housing 100 may be connected by a plurality of screws. The screws correspond to the positioning posts 103 in the housing 100 one by one, and correspond to the positioning holes in the lens holder one by one. Every reference column 103 in this casing 100 has the internal thread, so, every screw can pass on the lens mount after the locating hole that corresponds with the reference column 103 threaded connection who corresponds in the casing 100 to realized being connected between lens mount and the casing 100, and can guarantee that the fastness of being connected between this lens mount and the casing 100 is higher.
In the related art, when a laser projection device works, a projection lens and an optical engine in the laser projection device both generate thermal expansion along with the rise of working temperature, and the deformation of the projection lens after thermal expansion is usually different from the deformation of the optical engine after thermal expansion, so that the distance between a lens group in the projection lens and a light receiving surface of a digital micromirror device in the optical engine changes, and further the focal plane of the lens group in the projection lens shifts, and the projection lens generates a temperature drift phenomenon, and finally a picture projected by the laser projection device generates a serious fuzzy distortion phenomenon, thereby seriously affecting the viewing experience of a user.
In the present application, in order to further improve the display effect of the image projected by the laser projection apparatus in which the optical engine 000 is located, it is necessary to ensure that the positional relationship between the light receiving surface 601 of the dmd 600 in the optical engine 000 and the lens group in the projection lens is always 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 dmd 600.
Therefore, when the laser projection apparatus works, the deformation of the optical engine 000 after thermal expansion is matched with the deformation of the projection lens after thermal expansion, so that the distance that the projection lens moves to the direction close to the digital micromirror device 600 in the optical engine 000 on the focal plane of the lens set after thermal expansion is the same as the distance that the digital micromirror device 600 moves to the direction far away from the projection lens after thermal expansion of the optical engine 000. Further, the focal plane of the lens group in the projection lens can be ensured to be always located on the light receiving surface 601 of the digital micromirror device 600, so that the temperature drift phenomenon of the projection lens is avoided, the display effect of the image projected by the laser projection device is further improved, and the watching experience of a user is better.
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 the deformation of the optical engine 000 after thermal expansion is required to be matched with the deformation of the projection lens after thermal expansion, the working temperature of the optical engine 000 and the working temperature of the laser projection device only need to be matched with each other when the laser projection device works. That is, it is necessary to ensure that the operating temperature of the optical engine 000 and the operating temperature of the laser projection apparatus correspond to each other.
It should be noted that the corresponding relationship between the operating temperature of the optical engine 000 and the operating temperature of the laser projection apparatus may be obtained in advance through an operation simulation experiment performed on the laser projection apparatus. For example, if the operating temperature of the projection lens is 45 ℃ (celsius degrees), when the operating temperature of the optical engine 000 is 50 ℃, the distance that the projection lens moves toward the digital micromirror device 600 in the optical engine 000 at the focal plane of the thermally expanded lens set is the same as the distance that the digital micromirror device 600 moves away from the projection lens after the optical engine 000 is thermally expanded.
For this reason, in the embodiment of the present application, when the laser projection apparatus where the optical engine 000 is located operates, the controller 300 in the optical engine 000 needs to obtain not only the current operating temperature of the optical engine 000 but also 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 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. Therefore, the distance that the projection lens moves towards the direction close to the digital micromirror device 600 in the optical engine 000 at the focal plane of the lens group after being heated and expanded can be ensured to be the same as the distance that the digital micromirror device 600 moves towards the direction far away from the projection lens after being heated and expanded by the optical engine 000, 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, and the better display effect of the picture projected by the laser projection equipment is ensured.
For example, as shown in fig. 6, fig. 6 is a block diagram of a structure of an optical engine provided in an embodiment of the present application. The optical engine 000 may further include: and a second temperature detector 700 electrically connected to the controller 300. The second temperature detector 700 is used for detecting the operating temperature of the projection lens. In the present application, since the lens mount in the projection lens is usually made of plastic, which has poor thermal conductivity, in order for the second temperature detector 700 to be able to more accurately detect the operating temperature of the projection lens, the second temperature detector 700 needs to be located in the projection lens, for example, the second temperature detector 700 may be installed in the lens mount in the projection lens. In this way, the temperature inside the lens mount detected by the second temperature detector 700 is the working temperature of the projection lens.
In this application, when the laser projection apparatus in which the optical engine 000 is located operates, the first temperature detector 400 in the optical engine 000 may send the current operating temperature of the optical engine 000 detected by the first temperature detector to the controller 300, and at the same time, the second temperature detector 700 in the optical engine 000 may send the current operating temperature of the projection lens detected by the second temperature detector to the controller 300. The controller 300 may simultaneously receive the current operating temperature of the optical engine 000 detected by the first temperature detector 400 and the current operating temperature of the projection lens detected by the second temperature detector 700.
As such, the controller 300 may be 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, the heat dissipation fan 200 is controlled to blow air towards the air inlet 101 of the housing 100 to reduce the operating temperature of the optical engine 000. And, the controller 300 may be further configured to: after controlling the heat dissipation fan 200 to blow air into the air inlet 101 of the housing 100, based on the current operating temperature of the optical engine 000 detected by the first temperature detector 400 and the current operating temperature of the projection lens detected by the second temperature detector 700, the rotation speed of the heat dissipation fan 200 is adjusted to adjust the heat dissipation efficiency of the heat dissipation 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 current operating temperature of the projection lens.
In the embodiment of the present application, the controller 300 may be configured to: after the current operating temperature of the projection lens is detected by the second temperature detector 700, a target operating temperature corresponding to the current operating temperature of the projection lens is determined according to a predetermined correspondence relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000, and the rotation speed of the cooling fan 200 is adjusted based on a temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature, so as to adjust the current operating temperature of the optical engine 000 to the target operating temperature. The rotation speed of the cooling fan 200 is positively correlated to the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature.
In the present application, the correspondence relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000 is experimentally determined in advance, and the correspondence relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000 may be stored in a designated memory address in the controller 300. In this way, after the controller 300 detects the current operating temperature of the projection lens through the second temperature detector 700, the target operating temperature corresponding to the current operating temperature of the projection lens may be determined according to the stored correspondence relationship between the operating temperature of the projection lens and the operating temperature of the optical engine 000. Then, the controller 300 needs to adjust the current operating temperature of the optical engine 000 to the target operating temperature by controlling the rotation speed of the cooling fan 200.
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 may increase the rotation speed of the cooling fan 200 to increase the cooling 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 is determined that the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature is small, the controller 300 may decrease the rotation speed of the heat dissipation fan 200 to reduce the heat dissipation efficiency of the heat dissipation fan 200 to the optical engine 000, so as to avoid the phenomenon that the current operating temperature of the optical engine 000 is lower than the target operating temperature due to an excessively fast decrease speed of the current operating temperature of the optical engine 000.
In other alternative implementations, a correspondence relationship between the rotation speed of the cooling fan 200 and the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature may be determined in advance, so that after the controller 300 determines the temperature difference between the current operating temperature of the optical engine 000 and the target operating temperature, the cooling fan 200 may be controlled to rotate at a corresponding rotation speed based on the correspondence relationship and the temperature difference, so that the cooling fan 200 can adjust the current operating temperature of the optical engine 000 to the target operating temperature more quickly.
Optionally, the controller 300 in the optical engine 000 is further configured to: in the process of adjusting the operating temperature of the optical engine 000 by the cooling fan 200, if it is determined that the temperature variation of the optical engine 000 is smaller than the temperature variation threshold within the specified time period, the rotation speed of the cooling fan 200 is increased.
For example, during the adjustment of the operating temperature of the optical engine 000 by the heat dissipation fan 200, the first temperature detector 400 in the optical engine 000 can continuously detect the current operating temperature of the optical engine 000. Accordingly, the controller 300 in the optical engine 000 may determine whether the temperature variation of the optical engine 000 is less than the temperature variation threshold for a specified time period. When the controller 300 determines that the temperature variation of the optical engine 000 is smaller than the temperature variation threshold within the specified time period, which indicates that the heat dissipation effect of the heat dissipation fan 200 on the optical engine 000 is poor, at this time, the rotation speed of the heat dissipation fan 200 may be increased to improve the heat dissipation effect of the heat dissipation fan 200 on the optical engine 000, so that the current operating temperature of the optical engine 000 can be quickly reduced to the target operating temperature.
For example, assuming that the specified time period is 20 seconds, and the temperature change threshold is 0.5 ℃, in the process of adjusting the operating temperature of the optical engine 000 by the cooling fan 200, when the controller 300 in the optical engine 000 determines that the temperature change amount of the optical engine 000 is less than 0.5 ℃ within 20 seconds through the first temperature detector 400, the controller 300 may increase the rotation speed of the cooling fan 200 to improve the cooling effect of the cooling fan 200 on the optical engine 000.
Optionally, the controller 300 in the optical engine 000 is further configured to: after the current operating temperature of the optical engine 000 is adjusted to the target operating temperature, the rotation speed of the heat dissipation fan 200 may be adjusted to be low.
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 may adjust the rotation speed of the cooling fan 200 to be low, so that the cooling fan 200 operates at a low rotation speed. The cooling fan 200 operating at a low speed can not only prevent the operating temperature of the optical engine 000 from continuously increasing, but also prevent the operating temperature of the optical engine 000 from decreasing, so as to maintain the operating temperature of the optical engine 000 at the target operating temperature.
It should be noted that, after the current operating temperature of the optical engine 000 is adjusted to the target operating temperature, the rotation speed of the cooling fan 200 in the optical engine 000 may be in positive correlation with the target operating temperature, and the corresponding relationship between the rotation speed of the cooling fan 200 and the target operating temperature may be obtained in advance through a simulation experiment. In this way, after the current operating temperature of the optical engine 000 is adjusted to the target operating temperature, the controller 300 in the optical engine 000 may query the corresponding relationship between the rotation speed of the heat dissipation fan 200 and the target operating temperature, determine a specified rotation speed corresponding to the current operating temperature of the optical engine 000 based on the corresponding relationship, and adjust the rotation speed of the heat dissipation fan 200 to the specified rotation speed, so that the operating temperature of the optical engine 000 is maintained at the target operating temperature.
It should be noted that, in the above embodiments, the current operating temperature of the optical engine 000 is higher than the target operating temperature corresponding to the current operating temperature of the projection lens, and the heat dissipation fan 200 in the optical engine 000 needs to dissipate heat of the optical engine 000. In other possible implementations, the current operating temperature of the optical engine 000 may also be lower than the target operating temperature corresponding to the current operating temperature of the projection lens. In this case, the controller 300 in the optical engine 000 needs to control the heat dissipation fan 200 to stop operating, so that the current operating temperature of the optical engine 000 is increased to the target operating temperature.
Optionally, the controller 200 in the optical engine 000 in the above embodiment may be: a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP) or a Field Programmable Gate Array (FPGA), a modem and the like.
In summary, the optical engine provided in the embodiment of the present application includes: the temperature sensor comprises a shell, 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 may control the heat dissipation fan to blow air through the controller, and the air blown by the heat dissipation fan may enter the housing from the air inlet of the housing and be discharged from the air outlet of the housing. So, be located the inside gas that can produce the flow of this casing, the casing can be taken away from the air outlet to the heat that this flowing gas can produce the inside components and parts during operation of this casing, the effectual operating temperature who is located the inside components and parts of this casing that has reduced, and then make the operating temperature of this optical engine lower, and can effectual improvement be located the reliability of the inside components and parts of this casing, and then make the display effect of the picture that laser projection equipment at this optical engine place throws better.
An embodiment of the present application further provides a laser projection apparatus, as shown in fig. 7, fig. 7 is an exploded view of the laser projection apparatus provided in the embodiment of the present application. The laser projection apparatus 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 embodiments. For example, the optical engine 000 may be the optical engine 000 shown in fig. 1, 3, or 6.
By way of example, the projection lens 001 may include: the lens holder, and the speculum and a plurality of lens group of being located in the lens holder. The reflecting mirror is located on a side of the plurality of lens groups away from the optical engine 000. Each lens set may include: at least one convex lens and/or at least one concave lens.
In an embodiment of the present application, the laser projection apparatus may further include: light source modules (not shown). As an example, the light source assembly may include: laser, fluorescence wheel, filter color wheel and reflection assembly etc.. The laser may be a blue laser. After the blue laser emits blue light, red light and green light are generated by the fluorescent wheel, and then the blue light, the red light and the green light can be reflected to the optical engine 000 through the reflective component after passing through the color filter wheel.
The optical engine 000 may include: an illumination assembly, a digital micromirror device, and a galvanometer. The illumination assembly is used for processing the light beam input to the optical engine 000 into an illumination light beam; the digital micromirror device 600 is used for modulating the illumination light beam provided by the illumination assembly with an image signal to form a modulated light beam; the galvanometers in the optical engine 000 are electrically driven to periodically move at four positions, and modulated light beams passing through the galvanometers sequentially enter the projection lens 001 in a staggered manner.
The projection lens 001 may project and image the light beam adjusted by the optical engine 000 through a plurality of lens groups and mirrors.
An embodiment of the present application further provides a laser projection system, as shown in fig. 8, fig. 8 is a schematic structural diagram of the laser projection system provided in the embodiment of the present application. The laser projection system may include: a laser projection device 1 and a projection screen 2. The laser projection apparatus 1 may be the laser projection apparatus shown in the above-described embodiment. The laser projection apparatus 1 may emit light obliquely upward so that the laser projection apparatus 1 may project a picture to the projection screen 2.
In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. An optical engine, comprising:
a housing having an air inlet and an air outlet;
the heat dissipation fan, the controller and the first temperature detector are positioned outside the shell and connected with the shell;
wherein, the air-out face of radiator fan is towards the air intake, the controller respectively with radiator fan and the first temperature detector electricity be connected, the controller is configured to: and after the current working temperature of the optical engine detected by the first temperature detector is determined to be higher than a temperature threshold value, controlling the cooling fan to blow air to the air inlet.
2. The optical engine of claim 1,
the optical engine further includes: a second temperature detector electrically connected to the controller, the second temperature detector being located within a projection lens connected to the optical engine, the controller being configured to: after the cooling fan is controlled to blow air to the air inlet, the rotating speed of the cooling fan is adjusted based on the current working temperature of the optical engine detected by the first temperature detector and the current working temperature of the projection lens detected by the second temperature detector.
3. The optical engine of claim 2,
the controller is configured to: after the current working temperature of the projection lens is detected by the second temperature detector, determining a target working temperature corresponding to the current working temperature of the projection lens according to a predetermined corresponding relation between the working temperature of the projection lens and the working temperature of the optical engine, and adjusting the rotating speed of the cooling fan based on a temperature difference between the current working temperature of the optical engine and the target working temperature so as to adjust the current working temperature of the optical engine to the target working temperature;
wherein the rotation speed of the cooling fan is positively correlated with the temperature difference.
4. The optical engine of claim 3,
the controller is further configured to: and after the current working temperature of the optical engine is adjusted to the target working temperature, the rotating speed of the cooling fan is reduced.
5. The optical engine of claim 3,
the controller is further configured to: in the process of adjusting the working temperature of the optical engine, if it is determined that the temperature variation of the optical engine is smaller than the temperature variation threshold value within the specified time period, the rotating speed of the cooling fan is increased.
6. An optical engine according to any one of claims 1 to 5,
the optical engine further includes: the first ventilation filter screen is connected with the air inlet, and the second ventilation filter screen is connected with the air outlet.
7. An optical engine according to any one of claims 1 to 5,
the heat dissipation fan includes: the fan bracket is fixedly connected with the shell, and the fan body is movably connected with the fan bracket.
8. An optical engine according to any one of claims 1 to 5,
the housing further has a light passing hole, and the optical engine further includes: the lighting device comprises a digital micro-mirror device, a lighting assembly and a vibrating mirror, wherein the digital micro-mirror device is positioned outside the shell and connected with the shell, and the lighting assembly and the vibrating mirror are positioned in the shell and connected with the shell, and a light receiving surface of the digital micro-mirror device faces the light through hole.
9. An optical engine according to any one of claims 1 to 5,
the shell is provided with a plurality of positioning columns used for being connected with the projection lens.
10. A laser projection device, comprising: an optical engine, and a projection lens coupled to the optical engine, the optical engine comprising: the optical engine of any of claims 1 to 9.
CN202011619634.7A 2020-12-31 2020-12-31 Optical engine and laser projection equipment Pending CN112731748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011619634.7A CN112731748A (en) 2020-12-31 2020-12-31 Optical engine and laser projection equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011619634.7A CN112731748A (en) 2020-12-31 2020-12-31 Optical engine and laser projection equipment

Publications (1)

Publication Number Publication Date
CN112731748A true CN112731748A (en) 2021-04-30

Family

ID=75608143

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011619634.7A Pending CN112731748A (en) 2020-12-31 2020-12-31 Optical engine and laser projection equipment

Country Status (1)

Country Link
CN (1) CN112731748A (en)

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