CN110262588B - Temperature control method, control system, and computer-readable storage medium - Google Patents
Temperature control method, control system, and computer-readable storage medium Download PDFInfo
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- CN110262588B CN110262588B CN201910602479.9A CN201910602479A CN110262588B CN 110262588 B CN110262588 B CN 110262588B CN 201910602479 A CN201910602479 A CN 201910602479A CN 110262588 B CN110262588 B CN 110262588B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
Abstract
The invention discloses a temperature control method, a control system and a computer readable storage medium, wherein the temperature control method is applied to a temperature control system of projection equipment, the projection equipment comprises a light source, the temperature control system comprises a temperature sensor, a heat dissipation device and a fan, the heat dissipation device comprises a first heat dissipation fin, and the temperature control method comprises the following steps: acquiring a first temperature difference value of the light source and the first cooling fin; acquiring a first detection temperature of the first cooling fin; determining a first working temperature according to the first temperature difference and the first detection temperature; and adjusting the rotating speed of the fan according to the first working temperature. The invention provides a temperature control method, a control system and a computer readable storage medium, which solve the problem that the temperature data which can not be directly measured or directly measured on the temperature of a light source is inaccurate in the prior art.
Description
Technical Field
The present invention relates to the field of optical detection technologies, and in particular, to a temperature control method, a temperature control system, and a computer-readable storage medium.
Background
The light source is one of important component parts of the projection equipment, the quality of the light source directly influences the imaging quality of the projection equipment, the temperature of the light source can be gradually increased along with the increase of working time in the working process of the light source, the temperature of the light source can have great influence on the light intensity and the imaging effect of the light source, when a projection optical machine provided with the light source tests the performance of the optical machine, the working temperature of the light source needs to be adjusted according to the heat dissipation condition of the projection equipment, and therefore the parameter accuracy of the light source in the aspects of white balance, color temperature, hue and the like is ensured, and under the condition, the real-time performance and the accuracy of the adjustment of the working temperature of the light source need to be.
In the prior art, in the production process of projection equipment, the temperature of the light source cannot be directly measured, or the temperature of the light source cannot be directly measured, so that the heat dissipation of the light source is influenced, the damage of the light source can be caused, and accurate working temperature data of the light source cannot be obtained.
Disclosure of Invention
The invention provides a temperature control method, a control system and a computer readable storage medium, and aims to solve the problem that the temperature data which cannot be directly measured or directly measured on the temperature of a light source is inaccurate in the prior art.
In order to achieve the above object, the present invention provides a temperature control method, which is applied to a temperature control system of a projection apparatus, the projection apparatus including a light source, the temperature control system including a temperature sensor, a heat sink and a fan, the heat sink including a first heat sink, the temperature control method including:
acquiring a first temperature difference value of the light source and the first cooling fin;
acquiring a first detection temperature of the first cooling fin;
determining a first working temperature according to the first temperature difference and the first detection temperature;
and adjusting the rotating speed of the fan according to the first working temperature.
Optionally, the temperature control system further includes a calibration device, and the acquiring a first temperature difference value between the light source and the first heat sink includes:
abutting the alignment device against the first heat sink;
when the calibration device is determined to work stably, determining a first light source temperature and a first heat sink temperature of the calibration device;
determining the first temperature difference value according to the first light source temperature and the first heat sink temperature.
Optionally, the obtaining a first temperature difference value between the light source and the first heat sink further includes:
acquiring the running time of the calibration device;
determining that the calibration device is in a steady state when the runtime of the calibration device is greater than the warm-up time.
Optionally, the obtaining a first temperature difference value between the light source and the first heat sink further includes:
acquiring a light source temperature change value of the calibration device;
and when the light source temperature change value is smaller than a preset change value, determining that the calibration device is in a stable state.
Optionally, the adjusting the fan speed according to the first operating temperature includes:
when the acquired first working temperature is lower than a preset temperature, reducing the wind speed of the fan;
and when the acquired first working temperature is higher than a preset temperature, improving the wind speed of the fan.
To achieve the above object, the present application provides a temperature control system for detecting a temperature of a projection apparatus, the projection apparatus including a light source, the temperature control system including a temperature sensor, a heat dissipation device, a fan, a calibration device, and a controller, the heat dissipation device including a first heat dissipation plate,
the temperature sensor is used for acquiring a first detection temperature of the first cooling fin;
the calibration device is used for acquiring a first temperature difference value of the first cooling fin and the light source;
the fan is used for adjusting the temperature of the first radiating fin;
the controller is in communication with the temperature sensor and the fan, and is configured to perform the temperature control method according to any one of the embodiments.
Optionally, a groove is formed in the first heat sink, and the temperature sensor is embedded in the groove.
Optionally, the temperature sensor is disposed at the center of one side surface of the light source close to the first heat sink.
Optionally, the temperature control system further includes a heat conducting member and a second heat sink, one end of the heat conducting member is connected to the first heat sink, the other end of the heat conducting member is connected to the second heat sink, and the air outlet direction of the fan points to the second heat sink.
To achieve the above object, the present application proposes a computer-readable storage medium comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, further implementing the steps of the temperature control method according to any one of the above embodiments.
In the technical scheme provided by the application, the temperature control method is applied to a temperature control system of a projection device, the projection device comprises a light source, the temperature control system comprises a temperature sensor, a heat dissipation device and a fan, the heat dissipation device comprises a first cooling fin, and the temperature control method comprises the following steps: the method comprises the steps of firstly obtaining a first temperature difference value between the light source and the first radiating fin, secondly obtaining a first detection temperature of the first radiating fin, determining a first working temperature according to the first temperature difference value and the first detection temperature, and finally adjusting the rotating speed of the fan according to the first working temperature. The working temperature of the light source is indirectly obtained by measuring the temperature of the first radiating fin according to the temperature difference value between the first radiating fin and the light source, so that the working temperature of the light source can be measured in real time, and the problem that the heat radiation of the light source is influenced in the measuring process is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the temperature control system of the present invention;
FIG. 2 is a front view of a first heat sink of the present invention;
FIG. 3 is a schematic flow chart diagram of an embodiment of a temperature control method of the present invention;
FIG. 4 is a schematic flow chart of another embodiment of the temperature control method of the present invention;
FIG. 5 is a schematic flow chart of another embodiment of the temperature control method of the present invention;
FIG. 6 is a schematic flow chart of another embodiment of the temperature control method of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
22 | |
| 20 | |
23 | |
| 21 | The |
30 | Fan with |
| 211 | Groove | 40 | Controller |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a temperature control method, a control system and a computer readable storage medium.
Referring to fig. 1 to 3, the temperature control method is applied to a temperature control system of a projection apparatus, the projection apparatus includes a light source 10, the temperature control system includes a temperature sensor, a heat dissipation device 20 and a fan 30, the heat dissipation device 20 includes a first heat sink 21, and the temperature control method includes:
s100, obtaining a first temperature difference between the light source 10 and the first heat sink 21;
wherein, the first temperature difference is used to represent the temperature difference between the light source 10 and the first heat sink 21 during the operation of the light source 10.
S200, acquiring a first detection temperature of the first cooling fin 21;
wherein the first detected temperature represents a temperature value of the first heat sink 21 detected by the temperature sensor.
S300, determining a first working temperature according to the first temperature difference and the first detection temperature;
wherein the first operating temperature represents an actual operating temperature of the light source 10.
S400, adjusting the rotating speed of the fan 30 according to the first working temperature.
In the technical solution provided in this application, the temperature control method is applied to a temperature control system of a projection apparatus, the projection apparatus includes a light source 10, the temperature control system includes a temperature sensor, a heat dissipation device 20 and a fan 30, the heat dissipation device 20 includes a first heat dissipation plate 21, and the temperature control method includes: first, a first temperature difference between the light source 10 and the first heat sink 21 is obtained, then, a first detected temperature of the first heat sink 21 is obtained, a first working temperature is determined according to the first temperature difference and the first detected temperature, and finally, the rotating speed of the fan 30 is adjusted according to the first working temperature. The working temperature of the light source 10 is indirectly obtained by measuring the temperature of the first radiating fin 21 and according to the temperature difference between the first radiating fin 21 and the light source 10, so that the working temperature of the light source 10 can be measured in real time, and the problem that the heat radiation of the light source 10 is influenced in the measuring process is avoided.
In a specific embodiment, in order to ensure that the light source 10 and the first heat sink 21 and the temperature sensor can stably and well transfer heat, a heat conducting medium is filled between the light source 10 and the first heat sink 21, specifically, the heat conducting medium is heat conducting silica gel or other heat conducting materials capable of transferring heat. The heat that light source 10 sent gives off heat transfer to first fin 21 through heat conduction silica gel, first fin 21 gives off heat again through heat conduction silica gel for temperature sensor, thereby realizes the temperature measurement of first fin 21.
Referring to fig. 4, in some alternative embodiments, the temperature control system further includes a calibration device (not shown), and the step S100 includes:
s110, abutting the alignment device against the first heat sink 21;
the calibration device is used for calibrating the temperature control system, and specifically, a temperature measurement sensor is installed on a light source of the calibration device and can accurately measure the temperature of the light source in the calibration device in real time.
S120, determining a first light source temperature and a first heat sink 21 temperature of the calibration device;
the first light source temperature is used for representing the working temperature of the light source in the calibration device, and specifically, the first light source temperature is measured by a temperature measurement sensor in the calibration device.
S130, determining the first temperature difference according to the first light source temperature and the first heat sink 21 temperature.
In a specific embodiment, the temperature control system performs temperature calibration through the calibration device, specifically, because a temperature measurement sensor is installed on a light source of the calibration device, when the temperature control system is subjected to temperature verification, the calibration device is abutted to the first heat sink 21, the temperature measurement sensor measures the temperature of the light source of the calibration device, and the temperature sensor measures the temperature of the first heat sink 21, a difference value between the temperature of the light source measured by the temperature measurement sensor and the temperature of the first heat sink 21 is a temperature difference value between the light source 10 and the first heat sink 21, and the working temperature of the light source 10 can be indirectly calculated through the first temperature difference value and the first detection temperature of the first heat sink 21.
Referring to fig. 5, in some optional embodiments, the step S100 further includes:
s50, acquiring the running time of the calibration device;
and S60, when the operation time of the calibration device is greater than the preheating time, determining that the calibration device is in a stable state.
Specifically, when the light source of the calibration device starts to operate, the temperature gradually rises and gradually approaches to be stable, and in order to accurately measure the operating temperature of the light source of the calibration device, the light source of the calibration device needs to be preheated, so that the temperature of the light source of the calibration device is measured after the light source of the calibration device is at the stable operating temperature. When the operation time of the light source of the calibration device is longer than the preheating time, it is determined that the operating temperature of the light source of the calibration device approaches a stable state, and the preheating is completed, so that the temperatures of the light source of the calibration device and the first heat sink 21 can be measured.
Referring to fig. 6, in some optional embodiments, the step S100 further includes:
s70, acquiring a light source temperature change value of the calibration device;
and S80, when the light source temperature change value is smaller than a preset change value, determining that the calibration device is in a stable state.
Specifically, when the light source of the calibration device starts to operate, the temperature gradually rises and gradually approaches to be stable, and in order to accurately measure the operating temperature of the light source of the calibration device, the light source of the calibration device needs to be preheated, so that the temperature of the light source of the calibration device is measured after the light source of the calibration device is at the stable operating temperature. When the temperature sensor of the calibration device detects that the temperature of the light source of the calibration device is in a stable range and the temperature change value is smaller than the preset change value, the calibration device is in a stable state, so that the temperatures of the calibration device and the first heat sink 21 can be measured.
In some optional embodiments, the step S400 includes:
when the acquired first working temperature is lower than a preset temperature, reducing the wind speed of the fan 30;
and when the acquired first working temperature is higher than the preset temperature, increasing the wind speed of the fan 30.
Specifically, the heat dissipation device 20 further includes a heat conduction member 22 and a second heat dissipation plate 23, the first heat dissipation plate 21 and the second heat dissipation plate 23 are connected through the heat conduction member 22, the air outlet direction of the fan 30 is directed to the second heat dissipation plate 23, and the fan 30 is configured to take away heat from the first heat dissipation plate 21 on the second heat dissipation plate 23. When the first working temperature is acquired to be higher than the preset temperature, in order to avoid that the imaging effect is reduced due to overheating of the light source 10 and the damage of the light source 10 may be caused, the heat dissipation efficiency of the second heat dissipation fin 23 is improved by increasing the wind speed of the fan 30, so that the temperature of the first heat dissipation fin 21 is reduced. When the acquired first working temperature is lower than the preset temperature, the wind speed of the fan 30 is reduced to maintain the light source 10 within the temperature range required by the working, so that the imaging quality deviation caused by the over-low temperature of the fan 30 is avoided.
In a specific embodiment, in the process of controlling the temperature of the projection apparatus, a first temperature difference between the light source 10 and the first heat sink 21 is first obtained by a calibration device, and when the heat-conducting medium between the first heat sink 21 and the light source 10 or the connection manner between the first heat sink 21 and the light source 10 is changed, the first temperature difference between the light source 10 and the first heat sink needs to be determined again, so as to ensure the accuracy of measuring the first operating temperature.
To achieve the above object, the present application provides a temperature control system for detecting a temperature of a projection device, the projection device comprises a light source 10, the temperature control system comprising a temperature sensor, a heat sink 20, a fan 30, calibration means and a controller 40, the heat dissipation device 20 includes a first heat dissipation plate 21, and specifically, the first heat dissipation plate 21 is connected to the light source 10 through a heat conduction medium, the temperature sensor is used for detecting the temperature of the first heat sink 21 in real time, the fan 30 is used for adjusting the temperature of the first heat sink, the controller 40 is connected in communication with the temperature sensor and the fan 30, and is configured to receive a temperature signal from the temperature sensor, and controls the fan 30 according to the temperature signal of the temperature sensor, thereby performing the temperature control method according to any one of the above embodiments.
In some optional embodiments, the first heat sink 21 is provided with a groove 211, the temperature sensor is embedded in the groove 211, specifically, the temperature sensor is a thermocouple, the thermocouple includes a measuring end and a reference end, the thermocouple generates electromotive force according to a difference between temperatures of the measuring end and the reference end, and measures the temperature according to the electromotive force. Since the thermocouple mainly detects the temperature by contacting the measuring end with the heat source, the measuring end of the thermocouple is embedded in the groove 211 of the first heat sink 21, so that the measuring end of the thermocouple is flush with the surface of the first heat sink 21, thereby facilitating the connection between the light source 10 and the first heat sink 21 and facilitating the contact heat transfer between the light source 10 and the first heat sink 21.
In a preferred embodiment, the temperature sensor is disposed at the center of one side surface of the light source 10 close to the first heat sink 21. Specifically, when the temperature sensor is located at another position on the surface of the light source 10 close to one side of the first heat sink 21, the heat emitted by the light source 10 is not uniformly distributed, so that the temperature sensor is prone to be unable to accurately determine the temperature of the light source 10 transferred to the first heat sink 21, and thus the first operating temperature of the light source 10 indirectly obtained is deviated, and the fan 30 cannot be accurately controlled according to the first operating temperature; when the temperature sensor is located at the center of the side surface of the light source 10 close to the first heat sink 21, the heat emitted by the light source 10 can be transferred to the temperature sensor through the heat-conducting medium after being transferred to the first heat sink 21, so that the problem that the first operating temperature of the light source 10 is not accurately measured due to the uneven temperature distribution of the light source 10 when the temperature sensor is located at other positions is avoided.
In some optional embodiments, the heat dissipation device 20 further includes a heat conduction member 22 and a second heat dissipation fin 23, one end of the heat conduction member 22 is connected to the first heat dissipation fin 21, the other end is connected to the second heat dissipation fin 23, and the air outlet direction of the fan 30 is directed to the second heat dissipation fin 23. Specifically, since the heat dissipation fan 30 in the actual projection apparatus cannot directly dissipate heat of the heat dissipation fins in contact with the light source, the heat dissipation is usually performed indirectly by a heat transfer manner, specifically, after the heat emitted by the light source 10 is transferred to the first heat dissipation fin 21, the first heat dissipation fin 21 transfers the heat to the second heat dissipation fin 23 through the heat conducting member 22, and since the air outlet direction of the fan 30 points to the second heat dissipation fin 23, the fan 30 can take the heat of the second heat dissipation fin 23 away from the second heat dissipation fin 23 along the air outlet direction, so that the heat transfer process from the first heat dissipation fin 21 to the second heat dissipation fin 23 is ensured, and the heat dissipation of the first heat dissipation fin 21 is facilitated.
In a specific embodiment, the projection apparatus is a Digital Light Processing (DLP) projection apparatus, and the display chip used by the DLP projection apparatus is a Digital Micromirror Device (DMD) chip.
It should be understood that the present application is not limited thereto, and in another embodiment, the projection apparatus is a Liquid Crystal On Silicon (LCOS) projection apparatus, and the display chip is an LCOS display chip.
The present application further provides a computer-readable storage medium comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, further implements the steps of the temperature control method according to any of the above embodiments.
In some alternative embodiments, the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the device, such as a hard disk or a memory of the device. The memory may also be an external storage device of the device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the device. Further, the memory may also include both internal and external storage units of the device. The memory is used for storing the computer program and other programs and data required by the device. The memory may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A temperature control method is applied to a temperature control system of a projection device, the projection device comprises a light source, the temperature control system comprises a temperature sensor, a heat dissipation device and a fan, the heat dissipation device comprises a first heat dissipation fin, the temperature control system further comprises a calibration device, and the temperature control method comprises the following steps:
abutting the alignment device against the first heat sink;
when the calibration device is determined to work stably, determining a first light source temperature and a first heat sink temperature of the calibration device;
determining a first temperature difference value according to the first light source temperature and the first heat sink temperature;
acquiring a first detection temperature of the first cooling fin;
determining a first working temperature according to the first temperature difference and the first detection temperature;
and adjusting the rotating speed of the fan according to the first working temperature.
2. The method of temperature control according to claim 1, wherein said abutting said calibration device against said first heat sink further comprises:
acquiring the running time of the calibration device;
determining that the calibration device is in a steady state when the runtime of the calibration device is greater than the warm-up time.
3. The method of temperature control according to claim 1, wherein said abutting said calibration device against said first heat sink further comprises:
acquiring a light source temperature change value of the calibration device;
and when the light source temperature change value is smaller than a preset change value, determining that the calibration device is in a stable state.
4. The method of claim 1, wherein said adjusting said fan speed based on said first operating temperature comprises:
when the acquired first working temperature is lower than a preset temperature, reducing the wind speed of the fan;
and when the acquired first working temperature is higher than a preset temperature, improving the wind speed of the fan.
5. A temperature control system, wherein the temperature control system is used for detecting the temperature of a projection device, the projection device comprises a light source, the temperature control system comprises a temperature sensor, a heat sink, a fan, a calibration device and a controller, the heat sink comprises a first heat sink,
the temperature sensor is used for acquiring a first detection temperature of the first cooling fin;
the calibration device is used for acquiring a first temperature difference value of the first cooling fin and the light source;
the fan is used for adjusting the temperature of the first radiating fin;
the controller is in communication with the temperature sensor and the fan, the controller being configured to perform the temperature control method of any of claims 1-4.
6. The temperature control system of claim 5, wherein the first heat sink has a recess formed therein, and the temperature sensor is embedded in the recess.
7. The temperature control system of claim 5, wherein the temperature sensor is disposed at a center of a side surface of the light source near the first heat sink.
8. The temperature control system of claim 5, further comprising a heat conducting member and a second heat sink, wherein one end of the heat conducting member is connected to the first heat sink and the other end is connected to the second heat sink, and the air outlet direction of the fan is directed to the second heat sink.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a processor, a memory and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, further realizes the steps of the temperature control method according to any one of claims 1-4.
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| CN201910602479.9A CN110262588B (en) | 2019-07-04 | 2019-07-04 | Temperature control method, control system, and computer-readable storage medium |
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| CN110702377B (en) * | 2019-10-21 | 2022-03-25 | 歌尔光学科技有限公司 | Abnormality detection method, projection apparatus, and computer-readable storage medium |
| CN110926401A (en) * | 2019-11-26 | 2020-03-27 | 歌尔股份有限公司 | Method and device for calibrating oscillating angle of galvanometer, projection system and storage medium |
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| CN109462754A (en) * | 2018-12-07 | 2019-03-12 | 成都三叶家具有限公司 | The monitoring system and its monitoring method of projector |
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2019
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