An adaptive wide-temperature-range optical projector and temperature control method

Abstract

The application belongs to the field of outdoor engineering projection equipment, and particularly relates to a self-adaptive wide-temperature-range optical projector and a temperature control method applied to the self-adaptive wide-temperature-range optical projector. The self-adaptive wide-temperature-range optical projector for outdoor engineering projection comprises a double-cavity isolation main body, a multi-point distributed temperature and humidity measuring module and a cold and hot bidirectional executing module. The double-cavity isolation main body comprises an optical sealing inner cavity and an external heat dissipation outer cavity. The outer part of the optical sealing inner cavity and the outer part of the external heat dissipation outer cavity are tightly attached through an adiabatic composite layer and a heat pipe. The optical sealing inner cavity is used for waterproofing and dustproofing. The wide-temperature-range adaptation, waterproofing and heat dissipation, precise intelligent temperature control, multi-point partition temperature measurement, four-mode self-adaptive switching, anti-condensation long-term protection, air pressure balance and dry circulation are realized.

Description

Technical Field

[0001] This invention relates to the field of outdoor engineering projection equipment, and in particular to an adaptive wide temperature range optical projector and a temperature control method applied to the adaptive wide temperature range optical projector. Background Technology

[0002] Currently, conventional engineering projectors are only suitable for indoor or normal-temperature outdoor environments, with temperature control ranges mostly limited to 0℃~40℃. For extreme outdoor conditions, existing technologies mainly employ the following methods: Single air cooling / heat pipe cooling: Relying on external fans and heat sinks for passive heat dissipation, the cooling efficiency is insufficient in high-temperature environments, and the internal light source, DMD chip, and optical engine module are prone to heat accumulation, triggering the device to reduce brightness and automatically shut down for protection, making it unable to work continuously; Simple low-temperature heating: Heating the entire machine only through the overall heating module, the temperature rise is slow, energy consumption is high, and there is no precise temperature control for the core optical components. At low temperatures, the thermal expansion and contraction of the lenses can easily cause the image to become less clear or distorted; Conventional sealed waterproof structure: Although the fully sealed shell can achieve basic waterproofing, there is no pressure balance between the inside and outside. When the temperature difference between day and night / winter and summer / winter changes, condensation is prone to occur inside the machine, leading to circuit board corrosion and mold growth on optical lenses; No temperature-linked optical compensation: The drift of optical device parameters caused by temperature changes relies entirely on manual calibration. In outdoor high-altitude and large-area installation scenarios, real-time adjustment is not possible, resulting in extremely poor image stability.

[0003] Existing technical defects and industry pain points: Narrow temperature range: Unable to meet the all-weather operation requirements of extreme outdoor environments such as -35℃ high cold and +60℃ high sun exposure, resulting in poor environmental adaptability; Conflict between heat dissipation and waterproofing: Fully sealed waterproofing hinders heat dissipation, while opening for heat dissipation compromises waterproofing and dustproofing effects, leading to high equipment failure rate; Low temperature control accuracy and lack of zoned control: Only the temperature of the entire machine is collected at a single point, making it impossible to differentiate the temperature control of core components such as light source, chip, and lens, resulting in large temperature control errors; Easily causes condensation due to temperature fluctuations: Imbalance between internal and external air pressure allows moisture to enter the machine, shortening its lifespan; Temperature-induced image quality drift: Without an optical adaptive compensation mechanism, the image focus, color, and contrast are unstable at high and low temperatures, failing to meet the image quality requirements of engineering projection. Summary of the Invention

[0004] To address the technical problem of a narrow temperature range adaptation, this invention provides an adaptive wide temperature range optical projector and a temperature control method applied to the adaptive wide temperature range optical projector.

[0005] The first aspect provides an adaptive wide temperature range optical projector for outdoor engineering projection, including: a dual-cavity isolated main body, a multi-point distributed temperature and humidity measurement module, and a bidirectional hot and cold execution module; The dual-cavity isolated body includes an optically sealed inner cavity and an external heat dissipation outer cavity; the outer surface of the optically sealed inner cavity and the outer surface of the external heat dissipation outer cavity are tightly bonded together by a heat insulation composite layer and a heat pipe; the optically sealed inner cavity is used for waterproofing and dustproofing. The multi-point distributed temperature and humidity measurement module collects temperature data and transmits it to the main control chip through temperature probes respectively located in the optical sealed cavity, outside the optical projector, the optical lens of the optical projector, the laser light source, and the power module; it also acquires humidity data through a humidity sensor located in the optical sealed cavity and transmits it to the main control chip. The bidirectional cooling and heating execution module includes a semiconductor cooling and heating component for cooling or heating regulation; an internal micro-positive pressure circulating fan for low-speed circulation to avoid airflow disturbance to the optical path; a waterproof and breathable balance valve for pressure balance and waterproofing; and a lens transparent heating film for heating.

[0006] Preferably, the interior of the optically sealed cavity is provided with: a laser source, a DMD chip, an optomechanical lens assembly, and a main control circuit board; The laser light source is used as the light source for the optical projector; The DMD chip is used to control the conversion of electrical signals into optical images; The optomechanical lens assembly includes an optical lens and a lens fine-tuning mechanism; it is used to project optical images. The main control circuit board is used to carry the main control chip and control the hot and cold bidirectional execution module.

[0007] Preferably, it also includes an optical adaptive compensation module; the optical adaptive compensation module includes: a lens micro-displacement driving mechanism, an RGB color gamut calibration unit, a Gamma grayscale adjustment unit, and a pre-stored full-temperature-range optical compensation database, used to receive the temperature data of the optical lens and the laser light source of the optical projector, and to perform correction of the lens position, color gamut parameters, and grayscale parameters.

[0008] Secondly, a temperature control method for adaptive wide-temperature-range optical projectors is provided, comprising: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is greater than 45°C, the main control chip triggers the cooling start of the semiconductor cooling and heating components, and the heat is discharged through the heat pipe's heat dissipation fins. The internal cavity features a slightly positive pressure fan that circulates at low speed to prevent airflow from disturbing the optical path.

[0009] Thirdly, a temperature control method for adaptive wide-temperature-range optical projectors is provided, including: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is above 0℃ and below 45℃, turn off the semiconductor cooling and heating components; The internal cavity temperature is maintained by relying on a water-cooled radiator and a heat exchanger; the water-cooled radiator includes: a water cooling head and a water cooling radiator.

[0010] Fourthly, a temperature control method for adaptive wide-temperature-range optical projectors is provided, comprising: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is below 0℃, the heating function of the semiconductor cooling and heating components is activated to heat the optically sealed inner cavity; Turn on the lens's transparent heating film to precisely preheat the optical lens.

[0011] Fifthly, a temperature control method for adaptive wide-temperature-range optical projectors is provided, comprising: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the temperature rises or falls by more than 20°C, the temperature sensor reads the data in real time and feeds it back to the main control chip. The main control chip automatically controls the temperature and air pressure of the optical seal cavity to maintain a slightly positive pressure state and prevent external moisture from entering. The humidity inside the optically sealed cavity is obtained by using a humidity sensor, and the drying cycle is started by the main control chip to control the humidity inside the machine at 45%±5%.

[0012] Beneficial effects: 1. Wide temperature range adaptability: Achieve stable operation in extreme environments from -35℃ to +60℃, covering all outdoor engineering needs in cold, hot, and large temperature differences between day and night. 2. Waterproof and heat dissipation in one: The dual-cavity isolation structure achieves IP66 waterproof and dustproof rating while ensuring efficient heat exchange, completely resolving the core contradiction between waterproofing and heat dissipation in the industry; 3. Precise and intelligent temperature control: Multi-point zone temperature measurement + four-mode adaptive switching, temperature control accuracy reaches ±3℃, core component targeted temperature control, reducing energy consumption by more than 30%; 4. Long-lasting anti-condensation protection: air pressure balance + drying circulation, eliminates condensation due to temperature difference and mold growth, and extends the service life of the equipment; 5. High stability: No external constant temperature enclosure, integrated design of the whole machine, convenient installation and maintenance, suitable for long-term unattended operation in outdoor high-altitude and harsh environments. Attached Figure Description

[0013] Figure 1 This is a first side view of an adaptive wide-temperature-range optical projector; Figure 2 This is a second side view of an adaptive wide-temperature-range optical projector; Figure 3 This is a third side view of an adaptive wide-temperature-range optical projector; Figure 4 Figure 1 shows a first embodiment of a temperature control method applied to an adaptive wide-temperature-range optical projector; Figure 5 This is a second embodiment of a temperature control method applied to an adaptive wide-temperature-range optical projector; Figure 6 This is a third embodiment of a temperature control method applied to an adaptive wide-temperature-range optical projector; Figure 7 This is a fourth embodiment of a temperature control method applied to an adaptive wide-temperature-range optical projector.

[0014] Explanation of reference numerals in the attached figures: 1. Waterproof and breathable valve; 2. PCB board; 3. Temperature and humidity sensor; 4. TEC temperature control module; 5. Laser light source; 6. Light source temperature probe; 7. Water cooling head; 8. Water cooling radiator; 9. External heat dissipation cavity; 10. Waterproof power supply; 11. Built-in power supply temperature probe; 12. Optical lens; 13. Optical lens heating film; 14. Lens temperature probe; 15. Equipment sealed inner cavity; 16. DMD temperature probe; 17. DMD chip; 18. Heat exchanger; 19. Fan 1; 20. Heat pipe radiator; 21. Thermal insulation pad; 22. TEC components; 23. Aluminum finned radiator; 24. Fan 2; 25. DMD heat pipe radiator; 26. Water cooling pipe; 27. Lens fine-tuning mechanism. Detailed Implementation

[0015] Terminology Explanation: DMD chip: Digital Micromirror Device, is the core of image generation in a digital light processing (DLP) projection system and belongs to MEMS spatial light modulators. The upstream laser / lamp light source provides uniform white light, and the digital micromirror device is responsible for converting the electrical signal into an optical image with corresponding brightness and grayscale, which is then projected onto the screen through the lens, equivalent to the "imaging pixel panel" of the projection.

[0016] TEC Temperature Control Module: Thermoelectric Cooler; TEC thermoelectric cooler is a bidirectional device; it can both cool and heat; forward current: the cold side absorbs heat and the hot side releases heat (cooling), and the hot side releases heat; reverse power supply (reverse current): the original cold side becomes the heating side, and the original hot side becomes the heat-absorbing side, thus achieving heating.

[0017] Firstly, such as Figure 1 , Figure 2 , Figure 3As shown, an adaptive wide temperature range optical projector is provided for outdoor engineering projection, including: a dual-cavity isolated main body, a multi-point distributed temperature and humidity measurement module, and a bidirectional cooling and heating execution module; The dual-cavity isolated main body includes an optically sealed inner cavity and an external heat dissipation outer cavity. The outer surfaces of the optically sealed inner cavity and the external heat dissipation outer cavity are tightly bonded together by a thermal insulation composite layer and a heat pipe. The optically sealed inner cavity is used for waterproofing and dustproofing. The outer surfaces of the optically sealed inner cavity and the external heat dissipation outer cavity must be tightly bonded together by the thermal insulation composite layer and the heat pipe to enable the external heat dissipation outer cavity to dissipate heat from the optically sealed inner cavity. The thermal insulation composite layer includes a TEC temperature control module and a thermal insulation pad. The heat pipe is connected to the heat pipe radiator. The multi-point distributed temperature and humidity measurement module collects temperature data and transmits it to the main control chip through temperature probes respectively located in the optical sealed cavity, outside the optical projector, the optical lens of the optical projector, the laser light source, and the power module; it also acquires humidity data through a humidity sensor located in the optical sealed cavity and transmits it to the main control chip. The bidirectional cooling and heating execution module includes semiconductor cooling and heating components for cooling or heating regulation; it is composed of a TEC temperature control module; an internal cavity micro-positive pressure circulating fan for low-speed circulation to avoid airflow disturbance to the optical path; a waterproof and breathable balance valve for pressure balance and waterproofing; and a lens transparent heating film for heating. This technical solution employs a dual-cavity isolated sealing structure, multi-point distributed zone temperature measurement, a bidirectional cooling and heating adaptive execution mechanism, and a temperature-linked optical compensation algorithm. It divides the projector into a fully sealed optical inner cavity and an independent heat dissipation outer cavity, achieving separation of waterproofing and heat dissipation. Through real-time acquisition of temperature data from multiple points, it intelligently switches between four working modes: high-temperature cooling, passive constant temperature at room temperature, precise heating at low temperature, and alternating anti-condensation. Simultaneously, it corrects optical focus, color temperature, and grayscale parameters in real time according to temperature changes, ultimately achieving fault-free operation and continuous image stability under extreme wide temperature ranges. The semiconductor cooling and heating components can be replaced with a miniature compression cooling module, suitable for higher lumen and ultra-high power outdoor projectors; the internal cavity micro-positive pressure circulating fan is fan two.

[0018] Preferably, the interior of the optically sealed cavity is provided with: a laser source, a DMD chip, an optomechanical lens assembly, and a main control circuit board; The laser light source is used as the light source for the optical projector; The DMD chip is used to control the conversion of electrical signals into optical images; a DMD temperature probe is also provided on the surface of the DMD chip to monitor the temperature of the DMD chip and send the temperature to the main control chip; the main control chip controls the operation of the DMD chip.

[0019] The optomechanical lens assembly includes an optical lens and a lens fine-tuning mechanism; it is used to project optical images. The main control circuit board is used to carry the main control chip and control the hot and cold bidirectional execution module.

[0020] Preferably, it also includes an optical adaptive compensation module; the optical adaptive compensation module includes: a lens micro-displacement driving mechanism, an RGB color gamut calibration unit, a Gamma grayscale adjustment unit, and a pre-stored full-temperature-range optical compensation database, used to receive the temperature data of the optical lens and the laser light source of the optical projector, and to perform correction of the lens position, color gamut parameters, and grayscale parameters.

[0021] Secondly, such as Figure 4 As shown, a temperature control method for an adaptive wide-temperature-range optical projector is provided, comprising: S101: The ambient temperature is obtained by a temperature probe installed outside the optical projector; S102: When the ambient temperature is greater than 45°C, the main control chip triggers the cooling start of the semiconductor cooling and heating components, and the heat is discharged through the heat pipe heat sink fins. S103: The internal cavity has a micro-positive pressure fan that circulates at low speed to avoid airflow disturbance to the optical path.

[0022] Thirdly, such as Figure 5 As shown, a temperature control method for an adaptive wide-temperature-range optical projector is provided, comprising: S201: The ambient temperature is obtained by a temperature probe installed outside the optical projector; S202: When the ambient temperature is greater than 0℃ and less than 45℃, shut down the semiconductor cooling and heating components; S203: The internal cavity temperature is kept stable by relying on a water-cooled radiator and a heat exchanger; the water-cooled radiator includes: a water cooling head and a water cooling radiator.

[0023] Fourthly, such as Figure 6 As shown, a temperature control method for an adaptive wide-temperature-range optical projector is provided, comprising: S301: Ambient temperature is obtained by a temperature probe installed outside the optical projector; S302: When the ambient temperature is below 0℃, the heating function of the semiconductor cooling and heating components is activated to heat the optically sealed inner cavity; S303: Opens the lens transparent heating film for precise preheating of the optical lens.

[0024] Fifthly, such as Figure 7 As shown, a temperature control method for an adaptive wide-temperature-range optical projector is provided, comprising: S401: Ambient temperature is obtained by a temperature probe located outside the optical projector; S402: When the temperature rises or falls by more than 20°C, the temperature sensor reads the data in real time and feeds it back to the main control chip. The main control chip automatically controls the temperature and air pressure of the optical seal cavity to maintain a slightly positive pressure state and prevent external moisture from entering. S403: The humidity sensor is used to obtain the humidity of the optically sealed inner cavity, and the main control chip is used to start the drying cycle to control the humidity inside the machine at 45%±5%.

[0025] Specific implementation parameters: Applicable equipment: 5000-12000 lumen outdoor engineering laser projectors; Operating temperature range: -35℃~+50℃; Temperature control accuracy: ±3℃; Protection rating: IP66; Humidity control range: 40%-70%RH.

[0026] Specific operating steps: 1. After the device is powered on, the multi-point distributed temperature measurement module collects the temperature of six points in real time: environment, internal cavity, light source, DMD chip, lens, and power supply, and transmits the data to the main control chip every 100ms. 2. The main control chip compares temperature data, determines the current operating condition, and automatically switches to the corresponding temperature control mode: During summer outdoor exposure to the sun, when the ambient temperature reaches 55℃, the high-temperature cooling mode is activated. The TEC cooling components, together with heat pipes and heat dissipation fins, quickly dissipate heat, and the internal cavity temperature is stabilized below 40℃. In winter outdoor conditions, where the ambient temperature drops to -25℃, activating the TEC heating mode activates the lens heating film, which works in conjunction with the lens heating film to raise the temperature of the lens and optical engine to above 0℃ within 10 minutes, allowing the equipment to start normally. When the temperature difference between day and night changes drastically, the anti-condensation mode is activated, the temperature is automatically adjusted, the waterproof and breathable valve balances the air pressure, and the slight positive pressure in the inner cavity prevents water vapor from entering and keeps the inside dry; the lens heating film is automatically activated based on temperature and humidity data. 3. The temperature control system synchronously triggers the optical compensation model, automatically correcting the focal length, color temperature, and grayscale according to the real-time temperature, ensuring no image shift or distortion; 4. During equipment operation, the main control chip learns temperature data and optimizes control parameters to achieve long-term stable adaptive operation.

[0027] Beneficial effects: 1. Wide temperature range adaptability: Achieve stable operation in extreme environments from -35℃ to +60℃, covering all outdoor engineering needs in cold, hot, and large temperature differences between day and night. 2. Waterproof and heat dissipation in one: The dual-cavity isolation structure achieves IP66 waterproof and dustproof rating while ensuring efficient heat exchange, completely resolving the core contradiction between waterproofing and heat dissipation in the industry; 3. Precise and intelligent temperature control: Multi-point zone temperature measurement + four-mode adaptive switching, temperature control accuracy reaches ±3℃, core component targeted temperature control, reducing energy consumption by more than 30%; 4. Long-lasting anti-condensation protection: air pressure balance + drying circulation, eliminates condensation due to temperature difference and mold growth, and extends the service life of the equipment; 5. High stability: No external constant temperature enclosure, integrated design of the whole machine, convenient installation and maintenance, suitable for long-term unattended operation in outdoor high-altitude and harsh environments.

[0028] Finally, it should be noted that any modification or equivalent substitution of some or all of the technical features based on the device structure and the technical solutions of the embodiments of the present invention, without departing from the corresponding technical solutions of the present invention, shall fall within the patent scope of the device structure and the embodiments of the present invention.

Claims

1. An adaptive wide-temperature-range optical projector for outdoor engineering projection, characterized in that, include: Dual-cavity isolated main body, multi-point distributed temperature and humidity measurement module, and bidirectional hot and cold execution module; The dual-cavity isolated body includes an optically sealed inner cavity and an external heat dissipation outer cavity; the outer surface of the optically sealed inner cavity and the outer surface of the external heat dissipation outer cavity are tightly bonded together by a heat insulation composite layer and a heat pipe; the optically sealed inner cavity is used for waterproofing and dustproofing. The multi-point distributed temperature and humidity measurement module collects temperature data and transmits it to the main control chip through temperature probes respectively located in the optical sealed cavity, outside the optical projector, the optical lens of the optical projector, the laser light source, and the power module; it also acquires humidity data through a humidity sensor located in the optical sealed cavity and transmits it to the main control chip. The bidirectional cooling and heating execution module includes a semiconductor cooling and heating component for cooling or heating regulation; an internal micro-positive pressure circulating fan for low-speed circulation to avoid airflow disturbance to the optical path; a waterproof and breathable balance valve for pressure balance and waterproofing; and a lens transparent heating film for heating.

2. The adaptive wide-temperature-range optical projector according to claim 1, characterized in that, The interior of the optically sealed cavity contains: a laser source, a DMD chip, an optomechanical mirror assembly, and a main control circuit board; The laser light source is used as the light source for the optical projector; The DMD chip is used to control the conversion of electrical signals into optical images; The optical-mechanical lens assembly includes an optical lens and a lens fine-tuning mechanism; Used to project optical images; The main control circuit board is used to carry the main control chip and control the hot and cold bidirectional execution module.

3. The adaptive wide-temperature-range optical projector according to claim 2, characterized in that, It also includes an optical adaptive compensation module; The optical adaptive compensation module includes: a lens micro-displacement driving mechanism, an RGB color gamut calibration unit, a Gamma grayscale adjustment unit, and a pre-stored full-temperature-range optical compensation database, used to receive the temperature data of the optical lens and laser light source of the optical projector, and to perform correction of lens position, color gamut parameters, and grayscale parameters.

4. A temperature control method for an adaptive wide-temperature-range optical projector, characterized in that, include: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is greater than 45°C, the main control chip triggers the cooling start of the semiconductor cooling and heating components, and the heat is discharged through the heat pipe's heat dissipation fins. The internal cavity features a slightly positive pressure fan that circulates at low speed to prevent airflow from disturbing the optical path.

5. A temperature control method for an adaptive wide-temperature-range optical projector, characterized in that, include: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is above 0℃ and below 45℃, the semiconductor cooling and heating components will be turned off. The internal cavity temperature is kept stable by relying on water-cooled radiators and heat exchangers; The water-cooled radiator includes: a water block and a water radiator.

6. A temperature control method for an adaptive wide-temperature-range optical projector, characterized in that, include: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the ambient temperature is below 0℃, the heating function of the semiconductor cooling and heating components is activated to heat the optically sealed inner cavity. Turn on the lens's transparent heating film to precisely preheat the optical lens.

7. A temperature control method for an adaptive wide-temperature-range optical projector, characterized in that, include: The ambient temperature is obtained by a temperature probe placed outside the optical projector; When the temperature rises or falls by more than 20°C, the temperature sensor reads the data in real time and feeds it back to the main control chip. The main control chip automatically controls the temperature and air pressure of the optical seal cavity to maintain a slightly positive pressure state and prevent external moisture from entering. The humidity inside the optically sealed cavity is obtained by using a humidity sensor, and the drying cycle is started by the main control chip to control the humidity inside the machine at 45%±5%.

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