CN110609393A - Laser light source system for balancing service life of laser and eliminating speckles for cinema - Google Patents
Laser light source system for balancing service life of laser and eliminating speckles for cinema Download PDFInfo
- Publication number
- CN110609393A CN110609393A CN201910900937.7A CN201910900937A CN110609393A CN 110609393 A CN110609393 A CN 110609393A CN 201910900937 A CN201910900937 A CN 201910900937A CN 110609393 A CN110609393 A CN 110609393A
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- China
- Prior art keywords
- light source
- laser light
- laser
- cinema
- heat dissipation
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
- H01S5/02415—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling by using a thermo-electric cooler [TEC], e.g. Peltier element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
Abstract
The invention discloses a laser light source system for a cinema for balancing the service life of a laser and eliminating speckles, which comprises a plurality of laser light source modules (1), wherein the back surface of each laser light source module (1) is attached to the cold surface of a semiconductor refrigeration sheet (8), and the hot surfaces of all the semiconductor refrigeration sheets (8) are attached to the cooling end of a heat dissipation circulation system; a temperature sensor (2) is integrated in each laser light source module (1), the temperature sensor (2) is connected with a temperature control system (3), the temperature control system (3) is connected with a constant current driving system (6), and the constant current driving system (6) is connected with each semiconductor refrigerating sheet (8). The invention adopts the rapid switching of the working state of the semiconductor refrigerating sheet to accurately control the temperature of the laser light source, thereby realizing the laser output of different wavelengths and eliminating the speckle problem of laser imaging.
Description
Technical Field
The invention relates to the technical field of laser light source application, laser light source heat dissipation and laser speckle elimination, in particular to a laser light source system for a cinema, which is used for balancing the service life of a laser and eliminating speckles.
Background
Laser displays have become dominant in the cinema industry in recent years, and cinema displays have required a long lifetime of the semiconductor laser used (3 ten thousand hours) in order to reduce costs, while reducing "speckle" due to laser correlation in order to achieve high display quality.
Due to the high coherence of laser light, the vibrations of points on an object to a point of view at an appropriate distance are coherent when a light wave is reflected from the surface of the object. The light field of the observation point is thus a superposition of the coherent sub-waves emitted by each point on the rough surface. Because the roughness is larger than the wavelength of light wave, the phases of the object which emit the wavelets from each point to the observation point are randomly distributed. The coherent addition results in a random intensity pattern of speckles-granular, laser speckle, which is believed to be a disturbance to the optical system that severely affects the resolution of the image. In laser projection imaging, speckle removal is important.
The speckle reduction method mainly comprises two main ideas, one is a method for eliminating the coherence of the laser by increasing the wavelength type or the spectral line width of the laser, and the other is a method for eliminating the speckle by superposing a plurality of speckle patterns in the human eye integration time by vibrating a screen or increasing a rotating scattering sheet. The first method has no moving parts and no noise, and is the first method in cinema field, but the method of increasing the wavelength types or laser line width is generally expensive and difficult to be widely used. At present, a method for processing a laser imaging surface is generally adopted for eliminating speckles in laser imaging, for example, the imaging surface vibrates, and when the vibration frequency of the imaging surface is greater than the frame number of human eyes, the speckle phenomenon observed by human eyes is reduced. However, this method requires a vibration motor to be added to the image forming surface, and is high in labor cost and maintenance cost, and also generates noise.
The optimal method for speckle suppression is to process from the light emitting source of the laser, so that the labor cost and the maintenance cost for later processing of an imaging surface can be saved. In contrast to gas lasers, laser diodes have the most prominent advantage that they have a uniquely tunable wavelength, which, according to the laser's resonant cavity theory, has an operating wavelength ofIn the formula: m is an integer; n is the coefficient of the laser medium; l is the cavity length. When the working temperature is changed by delta T, the output wavelength of the laser diode is shifted by lambda + delta lambda, and the small change isThe change in cavity length is negligible small compared to the coefficient change. Thus, theThe wavelength change Δ λ causes a phase difference change between the object light and the reference light waveDue to the wavelength modulation, the phase difference becomes Φ (x, y) + Δ Φ (Δ λ). It shows that if the wavelength of the laser diode is modulated, the random phase difference Φ (x, y) can be compensated by Δ Φ (Δ λ), which provides a way to eliminate laser speckle from cos Φ (x, y). In addition, the average size of the speckle grains is wavelength dependent, so that speckle can be suppressed by changing the wavelength of the laser.
Disclosure of Invention
The invention aims to realize the change of the wavelength of a laser by controlling the temperature of the laser, further realize the elimination of speckles in laser imaging from a laser source head, and provide a laser light source system for cinema for balancing the service life of the laser and eliminating the speckles
The invention is realized by adopting the following technical scheme:
the utility model provides a cinema is with balanced laser instrument life-span and laser light source system who eliminates speckle, includes a plurality of laser light source modules, and the laminating of every laser light source module back is installed in the cold side of semiconductor refrigeration piece, and the laminating of the hot side of all semiconductor refrigeration pieces is installed in heat dissipation circulation system's cooling end.
A temperature sensor is integrated in each laser light source module, the temperature sensor is connected with a temperature control system, the temperature control system is connected with a constant current driving system, and the constant current driving system is connected with each semiconductor refrigerating sheet.
The laser light source adopts three light source modules of red, green and blue with very high integration level, and outputs white laser after the laser of three colors of red, green and blue is properly proportioned. The laser light source module is convenient for carry out temperature control to laser light source in the module.
The semiconductor refrigeration piece is provided with a plurality of semiconductor refrigeration pieces, the semiconductor refrigeration piece is tightly attached to the back surface of each laser light source module, the two surfaces of each semiconductor refrigeration piece are respectively a cold surface and a hot surface, the cold surface of each semiconductor refrigeration piece is tightly attached to the back surface of each laser light source module, and the hot surface of each semiconductor refrigeration piece is tightly attached to the cooling end of the heat dissipation circulating system.
The heat dissipation circulating system comprises a cooling end, a heat dissipation end, a water pump, a circulating pipeline and a fan, wherein the cooling end, the heat dissipation end and the water pump are connected into a closed circulating channel through the circulating pipeline, and the fan is close to the heat dissipation end.
The temperature sensor is integrated inside the laser light source module and connected with the temperature control system.
The constant current driving system can realize digital control of output current and accurate control of the output current, thereby realizing fine control of the refrigerating capacity of the semiconductor refrigerating sheet. Meanwhile, the constant-current driving system of the semiconductor refrigerating pieces can switch the working state of each semiconductor refrigerating piece at the highest speed through digital signals, and the temperature of the laser light source can be controlled quickly and accurately.
The temperature control system is used for reading a real-time detection signal from the temperature sensor, sending an instruction to the constant current control system, adjusting output current according to the real-time laser light source temperature, controlling and switching the working state of the semiconductor refrigerating sheet, further controlling the refrigerating capacity of the semiconductor refrigerating sheet and realizing accurate control of the laser light source temperature. Meanwhile, the constant-current driving system can be rapidly switched among the plurality of semiconductor refrigerating pieces, and the working state and the working mode of each semiconductor refrigerating piece are rapidly and accurately controlled, so that the temperature of each laser light source module is accurately controlled, and the wavelength of each laser light source is changed.
The laser light source can cause the instability of output power due to the rapid change of temperature, the temperature and the laser light source are controlled in a linkage mode, namely a temperature control system is connected with a laser controller, and the output power of the laser light source is adjusted in real time by adopting a PWM (pulse width modulation) technology to enable the output power of the laser light source to be stabilized in a preset range.
The invention adopts a digital constant current control system to realize the accurate control of the semiconductor refrigeration sheet, simultaneously combines the PWM technology to control the output power of the laser light source, accurately controls the output wavelength of the laser light source, solves the speckle problem of laser imaging from the laser light source, and greatly saves the later installation and maintenance cost.
Drawings
Fig. 1 shows a schematic structural view of the present invention.
In the figure: the method comprises the following steps of 1-a laser light source module, 2-a temperature sensor, 3-a temperature control system, 4-a water pump, 5-a fan, 6-a constant-current driving system, 7-a water cooling plate, 8-a semiconductor refrigeration sheet, 9-a waterway hose and 10-cooling water discharge.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
A laser light source system for a cinema for balancing the service life of a laser and eliminating speckles comprises a semiconductor refrigeration sheet, a temperature detection device, a temperature control system, a heat dissipation circulation system and a constant-current driving system. By adopting a laser light source temperature regulation and control mechanism, the accurate regulation and control of the temperature of the laser light source is realized, and the speckle problem of laser can be effectively solved.
As shown in fig. 1, the semiconductor refrigeration device specifically includes a plurality of laser light source modules 1, the back surface of each laser light source module 1 is attached to the cold surface of a semiconductor refrigeration sheet 8, and the hot surfaces of all the semiconductor refrigeration sheets 8 are attached to the cooling end of the heat dissipation circulation system.
The system adopts the working principle of the semiconductor refrigerating sheet. The semiconductor refrigerating chip is also called as thermoelectric refrigerating chip, and is a heat pump. By using the Peltier effect of the semiconductor materials, when direct current passes through a galvanic couple formed by connecting two different semiconductor materials in series, heat can be absorbed and released at two ends of the galvanic couple respectively, and the aim of refrigeration can be fulfilled. The refrigerating technology generates negative thermal resistance, and the temperature difference range can be realized from positive temperature of 90 ℃ to negative temperature of 130 ℃. The device is characterized by no moving parts and higher reliability. The cold surface of the semiconductor refrigeration piece assembly is tightly attached to the back surface of the laser light source, the hot surface of the semiconductor assembly is tightly attached to the water cooling plate at the hot end of the heat dissipation system, and in order to increase the heat transfer efficiency, heat-conducting silicone grease is coated between the cold surface of the semiconductor refrigeration piece and the back surface of the laser light source module and between the hot surface of the semiconductor refrigeration piece and the cooling end of the heat dissipation circulation system.
The refrigerating temperature range of the semiconductor refrigerating sheet is from 90 ℃ of positive temperature to 130 ℃ of negative temperature, so the system uses a water-cooling heat-dissipation circulating system. The water pump cooling device comprises a cooling end, a heat dissipation end, a water pump 4 and a circulating pipeline (a water channel hose 9), wherein the cooling end, the water pump and the heat dissipation end are connected into a closed circulating channel through the circulating pipeline. Furthermore, the cooling end adopts a water cooling plate 7, the radiating end adopts radiating water discharge 10, in order to enhance the radiating efficiency, the radiating end is additionally provided with a capillary radiating condensation discharge and a fan 5, so that the radiating efficiency is enhanced, the rapid heat exchange is realized, and the overall efficiency of the system is improved. Adopt the water-cooling liquid to circulate in the system, the cooling water among the water pump drive circulation pipeline circulates, takes away the heat of laser light source module from the cooling end, and the cooling water after the cooling returns the cooling end again, cycle work at heat dissipation department release heat. Then, the semiconductor refrigeration piece transmits the temperature of the laser light source from the cold end to the cooling end of the heat dissipation circulation system, the water cooling plate is adopted in the semiconductor refrigeration piece, but the semiconductor refrigeration piece is not limited to the water cooling plate, the water pump conveys the water cooling liquid in the hose from the cooling end of the heat dissipation circulation system to the heat dissipation water discharge, the fan blows the air to the heat dissipation fins of the heat dissipation water discharge, the temperature of the water cooling liquid is reduced, and therefore the heat of the laser light source is brought to the external environment. The temperature through accurate control laser light source module comes the wavelength of modulation laser, eliminates laser imaging speckle through the phase difference of wavelength.
In order to accurately control the working temperature of the laser light source, the device comprises a temperature control system and a constant current driving (control) system.
A temperature sensor 2 is integrated in each laser light source module 1, the temperature sensor 2 is connected with a temperature control system 3, the temperature control system 3 is connected with a constant current driving system 6, and the constant current driving system 6 is connected with each semiconductor refrigerating sheet 8. The temperature control system receives a temperature sensor signal integrated in the light source module, compares the acquired temperature value with a system set temperature value, sends an instruction to the constant-current driving system (control chip) through a preset program, and digitally regulates and controls the refrigerating capacity of the semiconductor refrigerating sheet. Specifically, the temperature control system 3 comprises a processing chip and a control chip, the processing chip is used for reading a real-time detection signal from the temperature sensor and sending an instruction to the control chip, the control chip sends an instruction to the constant-current driving system, output current is adjusted according to the temperature in the real-time laser light source module, and the working state of the semiconductor refrigeration piece is controlled and switched, so that the refrigerating capacity of the corresponding semiconductor refrigeration piece is controlled, and the accurate control of the temperature of the laser light source is realized. In addition, the control chip is also used for controlling the water pump 4 and the fan 5 and controlling the rotating speed and the flow rate simultaneously.
The constant current driving system is a device for outputting constant current by adopting a professional DC/DC controller, and can realize stable operation of a fixed frequency and current mode framework in a wide power supply and output voltage range. The device can realize the digital control of the output current and accurately control the output current, thereby realizing the fine control of the refrigerating capacity of the semiconductor refrigerating sheet. Meanwhile, the constant-current driving system can switch the working state of each semiconductor refrigerating sheet at the highest speed through a digital signal, and ensures that the temperature of a laser light source is controlled quickly and accurately, so that laser output with different wavelengths is realized, and the speckle problem of laser imaging is eliminated.
Adjusting the temperature of the laser can affect the useful life of the laser. Therefore, in order to balance the working life of the laser, the invention adopts a, the temperature of the laser is dynamically changed; b. two regulating mechanisms are adopted for reducing the working current when the temperature of the laser rises above a standard value and for increasing the current when the temperature of the laser falls below the standard value. In practical application, the wavelength of the laser diode is adjusted by changing the working temperature, the thermal converter controlled by a Peltier device can realize the effect, a semiconductor refrigerating sheet is adopted, the action speed of the semiconductor refrigerating sheet is high, the temperature can be quickly controlled and regulated, the working is reliable, the service life is long, the control is easy, the adjustment is convenient, the refrigerating capacity of the device can be adjusted by adjusting the working current, the refrigerating or heating working state can be changed by switching the direction of the current, and the control on the working temperature of the laser diode can be met.
The temperature control system sends a PWM signal to the laser source controller, the output power of the laser source module is regulated and controlled in real time, and the stability of the output power of the laser source is ensured.
The laser light source adopts the very high laser light source module of integrated level, and this module light source is arranged concentratedly, and is small, is convenient for carry out temperature control to laser light source in the module. The system uses red, green and blue light source modules to properly proportion the red, green and blue lasers and then outputs white lasers.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a cinema is with balanced laser instrument life-span and eliminate laser light source system of speckle, includes a plurality of laser light source module (1), its characterized in that: the back surface of each laser light source module (1) is attached to the cold surface of each semiconductor refrigeration piece (8), and the hot surfaces of all the semiconductor refrigeration pieces (8) are attached to the cooling end of the heat dissipation circulating system;
a temperature sensor (2) is integrated in each laser light source module (1), the temperature sensor (2) is connected with a temperature control system (3), the temperature control system (3) is connected with a constant current driving system (6), and the constant current driving system (6) is connected with each semiconductor refrigerating sheet (8).
2. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 1, wherein: the heat dissipation circulation system adopts a water-cooling heat dissipation circulation system and comprises a cooling end, a heat dissipation end, a water pump (4) and a circulation pipeline, wherein the cooling end, the water pump and the heat dissipation end are connected into a closed circulation channel through the circulation pipeline.
3. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 2, wherein: the cooling end adopts a water cooling plate (7).
4. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 2, wherein: the heat dissipation end adopts heat dissipation water discharge (10).
5. The laser light source system for cinema that balances laser lifetime and eliminates speckle as claimed in claim 4, wherein: and a fan (5) is additionally arranged at the heat dissipation end and used for dissipating heat at the heat dissipation end.
6. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 1, wherein: and heat-conducting silicone grease is coated between the cold surface of the semiconductor refrigeration sheet (8) and the back surface of the laser light source module (1) and between the hot surface of the semiconductor refrigeration sheet (8) and the cooling end of the heat dissipation circulation system.
7. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 1, wherein: the temperature control system (3) comprises a processing chip and a control chip, wherein the processing chip is used for reading a real-time detection signal from the temperature sensor and sending an instruction to the control chip, the control chip sends an instruction to the constant-current driving system, the output current is adjusted according to the temperature in the real-time laser light source module, and the refrigerating capacity of the corresponding semiconductor refrigerating sheet is controlled.
8. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 7, wherein: the control chip is also used for controlling the water pump (4) and the fan (5).
9. The laser light source system for cinema that balances laser lifetime and eliminates speckle as claimed in claim 8, wherein: and the control chip sends a PWM signal to the laser light source controller to regulate and control the output power of the laser light source module in real time.
10. The laser light source system for cinema for balancing laser lifetime and eliminating speckle as claimed in claim 1, wherein: the laser light source module comprises a red light source module, a green light source module, a blue light source module and a blue light source module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900937.7A CN110609393A (en) | 2019-09-23 | 2019-09-23 | Laser light source system for balancing service life of laser and eliminating speckles for cinema |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910900937.7A CN110609393A (en) | 2019-09-23 | 2019-09-23 | Laser light source system for balancing service life of laser and eliminating speckles for cinema |
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| CN110609393A true CN110609393A (en) | 2019-12-24 |
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| CN201910900937.7A Pending CN110609393A (en) | 2019-09-23 | 2019-09-23 | Laser light source system for balancing service life of laser and eliminating speckles for cinema |
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Effective date of registration: 20220210 Address after: 030006 workshop No.3, No.51 Zhengyang Street, Taiyuan City, Shanxi Province Applicant after: Shanxi Hanwei laser Polytron Technologies Inc. Address before: 030006 floor 3, No. 2, electronic road, high tech Zone, Taiyuan City, Shanxi Province Applicant before: SHANXI OVO LIGHT VISION PHOTOELECTRIC TECHNOLOGY CO.,LTD. |
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Application publication date: 20191224 |