WO2023246917A1 - 三维打印设备及其光源控制方法、装置 - Google Patents

三维打印设备及其光源控制方法、装置 Download PDF

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Publication number
WO2023246917A1
WO2023246917A1 PCT/CN2023/101906 CN2023101906W WO2023246917A1 WO 2023246917 A1 WO2023246917 A1 WO 2023246917A1 CN 2023101906 W CN2023101906 W CN 2023101906W WO 2023246917 A1 WO2023246917 A1 WO 2023246917A1
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WO
WIPO (PCT)
Prior art keywords
light
led lamp
light source
illumination data
illumination
Prior art date
Application number
PCT/CN2023/101906
Other languages
English (en)
French (fr)
Inventor
梁宇浩
万欣
丁鹏
Original Assignee
广州黑格智造信息科技有限公司
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Publication of WO2023246917A1 publication Critical patent/WO2023246917A1/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • B29C64/264—Arrangements for irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present application relates to the technical field of light source control. Specifically, it relates to a three-dimensional printing equipment and a light source control method and device thereof.
  • LCD masking technology has been developed and used in 3D printing technology.
  • LCD liquid crystal display
  • 405nm UV (Ultra Violet) LED (Light Emitting Diode) lamp beads are used as backlight panels to achieve light-curing 3D printing in LCD.
  • UV LED Light Emitting Diode
  • the current LCD 3D printing technology still has some shortcomings and is difficult to meet the needs of users.
  • the purpose of this application is to provide a three-dimensional printing equipment and its light source control method and device to solve the problem of short service life of the selective light-transmitting screen in the three-dimensional printing equipment.
  • embodiments of the present application provide a light source control method for a three-dimensional printing device.
  • the three-dimensional printing device includes a selective light-transmitting screen, and the light source includes a plurality of LED light groups.
  • the light source control method includes:
  • the driving currents of the plurality of LED lamp groups are adjusted according to the relationship between the plurality of first illumination data, so that the plurality of first illumination data of the plurality of LED lamp groups are consistent.
  • the plurality of first illumination data include a plurality of first illumination intensities
  • the driving currents of the plurality of LED lamp groups are adjusted according to the relationship between the plurality of first illumination data, so that the plurality of first illumination groups of the plurality of LED lamps
  • the steps for consistent lighting data include:
  • the driving current of the LED lamp group with a smaller first illumination intensity among the plurality of first illumination intensities increases the driving current of the LED lamp group with a smaller first illumination intensity among the plurality of first illumination intensities, and/or decrease the driving current of the LED lamp group.
  • the driving current of the LED lamp group with a higher first illumination intensity among the plurality of first illumination intensities is used to reduce the difference between the plurality of first illumination intensities.
  • the step of providing driving current to the multiple LED lamp groups includes: providing constant current to the multiple LED lamp groups; the light source control method further includes:
  • the constant current is adjusted according to the relationship between the second illumination data and the preset illumination data, so that the second illumination data is consistent with the preset illumination data.
  • the second illumination data includes a second illumination intensity
  • the preset illumination data includes a preset illumination intensity
  • the constant current is adjusted according to the relationship between the second illumination data and the preset illumination data, so that the second illumination data is consistent with
  • the steps to preset consistent lighting data include:
  • the constant current is increased to reduce the difference between the second illumination intensity and the preset illumination intensity.
  • At least one of the constant current and the driving current is adjusted according to the light attenuation data, so that the plurality of first illumination data of the plurality of LED lamp groups are consistent and/or the illumination intensity of the second illumination data is consistent with the preset illumination data.
  • each of the plurality of LED light groups includes a plurality of LEDs, or each of the plurality of LED light groups includes one LED.
  • inventions of the present application also provide a light source control device for use in three-dimensional printing equipment.
  • the light source control device includes:
  • Selective light transmission screen set to selective light transmission
  • the light source includes a plurality of LED light groups, wherein the plurality of LED light groups are configured to project light to the selective light-transmitting screen;
  • a power supply electrically connected to the light source, and configured to provide driving current to the plurality of LED lamp groups
  • the current adjustment mechanism is electrically connected to each LED lamp group in the plurality of LED lamp groups, and is configured to adjust the driving current of the corresponding LED lamp group according to the relationship between the plurality of first illumination data of the plurality of LED lamp groups, so as to Make multiple first illumination data of multiple LED lamp groups consistent;
  • the plurality of first illumination data are illumination data obtained after the light projected by the plurality of LED lamp groups passes through the selective light-transmitting screen.
  • a light detection mechanism is also included, and the light detection mechanism is configured to detect a plurality of first illumination data after the light projected by the plurality of LED lamp groups passes through the selective light-transmitting screen.
  • the light detection mechanism includes at least one of a photoresistor, a photodiode, a photoelectric sensor, a photometer, an integrating sphere, and a camera.
  • each of the plurality of LED light groups includes a plurality of LEDs, or each of the plurality of LED light groups includes one LED.
  • the power supply is a constant current source and is configured to provide constant current to multiple LED lamp groups.
  • the number of the multiple power supplies is the same as the number of the multiple LED lamp groups, and the multiple power supplies are electrically connected to the multiple LED lamp groups in one-to-one correspondence.
  • the light source is a COB light source, and each of the plurality of LED light groups includes a COB chip.
  • embodiments of the present application also provide a three-dimensional printing equipment, including a material tray, a forming platform and the above-mentioned light source control device.
  • the material tray is configured to hold printing materials, and the printing materials are configured to be printed layer by layer under the irradiation of a light source. Formed on the build platform to get the print.
  • Embodiments of the present application provide a three-dimensional printing equipment and its light source control method and device.
  • the driving current of each LED lamp group can be adjusted through a current adjustment mechanism or other methods according to the first illumination intensity data of each LED lamp group.
  • Accurate and independent adjustment to achieve independent and precise control of a single LED or LEDs in an area and then make the first lighting data of the LED lamp group consistent through feedback, making its light output consistency better and the adjustment It has higher independence and accuracy, which can improve the light uniformity of the light source on the projection surface; on the other hand, adjusting the light uniformity in this way is similar to the related technology of achieving uniform light through the selective light-transmitting screen itself.
  • Figure 1 is a schematic structural diagram of a three-dimensional printing device provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a first module of a light source control device provided by an embodiment of the present application.
  • FIG. 3 is a schematic circuit diagram of a light source provided by an embodiment of the present application.
  • FIG. 4 is another circuit schematic diagram of the light source provided by the embodiment of the present application.
  • FIG. 5 is a schematic diagram of the second module of the light source control device provided by the embodiment of the present application.
  • Figure 6 is an exemplary flow chart of a light source control method for a three-dimensional printing device provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a third module of the light source control device provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a fourth module of a light source control device provided by an embodiment of the present application.
  • Figure 9 is a schematic diagram of the positions of the LED lamp set, the selective light-transmitting screen and the light detection mechanism provided by the embodiment of the present application.
  • FIG. 10 is a schematic diagram of the fifth module of the light source control device provided by the embodiment of the present application.
  • Figure 11 is another exemplary flow chart of a light source control method for a three-dimensional printing device provided by an embodiment of the present application.
  • Figure 12 is another exemplary flow chart of the light source control method of the three-dimensional printing device provided by the embodiment of the present application.
  • 100-light source control device 110-power supply; 120-light source; 121-LED lamp set; 130-current adjustment mechanism; 140-selective light-transmitting screen; 150-control mechanism; 160-light detection mechanism; 170-communication interface; 200-3D printing equipment; 210-molding platform; 220-material tray; 230-rack.
  • setting and “connection” should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a Indirect connection through an intermediary can be an internal connection between two components.
  • connection should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or a Indirect connection through an intermediary can be an internal connection between two components.
  • the 3D printing device 200 may include a 3D printer for shaping printing materials to obtain printed parts, or may also include a 3D printer for converting the printed parts from 3D printing materials. At least one of a pickup machine that is removed from the printer, a cleaning machine that is used to clean the removed prints, a light curing machine that is used to re-cure the prints, etc., is not limited here.
  • the 3D printer may include a material tray 220, a molding platform 210, a light source control device 100, etc., and a frame 230 for installing the above structures.
  • the material tray 220 is used to hold printing materials.
  • the printing material in this application can be a liquid photo-curing material, which can be cured by irradiation with light of a certain wavelength to form a solid-state print with a certain intensity, such as visible light. Curing materials, ultraviolet curing materials, etc., specifically, they can be photosensitive resins.
  • the forming platform 210 is located on one side of the material tray 220 and is raised and lowered under control so that the forming surface of the forming platform 210 is immersed in the printing material contained in the material tray 220 or is removed from the printing material.
  • the light source control device 100 can be located on the side of the material tray 220 away from the molding platform 210, and is used to project light to the side of the material tray 220, so that the printing material is solidified layer by layer on the molding surface of the molding platform 210 under the irradiation of light. , to get the printout.
  • the light source control device 100 may include a selective light-transmitting screen 140 and a light source 120 .
  • the selective light-transmitting screen 140 can be disposed on the side of the material tray 220 away from the molding platform 210, and is located between the material tray 220 and the light source 120. During 3D printing, the light emitted by the light source 120 selectively transmits The light-transmitting screen 140 then irradiates the printing material in the material tray 220 , so that the printing material is solidified on the forming platform 210 .
  • the light source 120 may include a plurality of LED light groups that may emit visible light and/or ultraviolet light. Light, where each LED light group may include one LED, or multiple LEDs, which are not limited here.
  • the light source 120 can be an ordinary LED light source, a COB light source, etc., and the light source 120 can be various types of LED light sources with optical lenses.
  • the LED lamp group may include one or more LEDs; and when the light source 120 is a COB light source, each LED lamp group may include a COB chip.
  • each LED The light set may include multiple LEDs. Please refer to Figure 3 and Figure 4 respectively.
  • Figure 3 shows the structure of the light source 120 provided by the present invention formed by an ordinary LED light source.
  • Figure 4 shows the structure of the light source 120 provided by the present invention formed by a COB light source.
  • the ordinary LED light source constituted by The light source 120 may include multiple ordinary LEDs, and the multiple ordinary LEDs may be connected in series or in parallel.
  • the light source 120 composed of a COB light source may include multiple COB light sources, and the multiple COB light sources may be independently connected to each other.
  • the selective light-transmitting screen 140 can achieve selective light transmission.
  • the selective light-transmitting screen 140 can transmit light to all areas or selectively partial areas according to the slice data corresponding to the printing task, and of course, it can also be opaque.
  • the multiple LED light groups included in the light source 120 emit light toward the selective light-transmitting screen 140, and the selective light-transmitting screen 140 fully transmits light or partially transmits light, thereby converting the multiple LED light groups into At least part of the emitted light is projected to the printing material contained in the material tray 220, thereby solidifying the printing material.
  • the selective light-transmitting screen 140 may be an LCD, or other screen with similar functions, which is not limited here.
  • the selective light-transmitting screen 140 is an LCD and the 3D printer is an LCD 3D printer, which has many advantages.
  • the price is cheap.
  • the core imaging components of an LCD 3D printer are the LED light source and LCD, both of which are relatively cheap compared to the optical machine of the DLP 3D printer or the laser galvanometer of the SLA 3D printer.
  • the architecture is simple.
  • the core structure of the LCD 3D printer is that the screw drives the molding platform 210 to print on the LCD; in the DLP 3D printing technology, the light emitted through the LED optical device shines on the Digital Micro-mirror Device (DMD) Reflection and then imaging; in addition, in SLA 3D printing technology, imaging is done through a laser galvanometer.
  • DMD Digital Micro-mirror Device
  • the structure of the LCD 3D printer is relatively simple. Again, high resolution.
  • the screens of LCD 3D printers currently on the market all have 4k resolution. In research and development or The pre-sale printers have about 6-8k resolution, or even 10k resolution, which is compared to the 4k resolution of DLP 3D printers through dither imaging, and the screen resolution of LCD 3D printers is very high.
  • LCD 3D printing technology still has some shortcomings.
  • the life of LCD is short, so users need to replace the LCD regularly or irregularly when using LCD 3D printers; secondly, the light transmission of LCD The rate is not high, which will have a certain impact on the quality of the printing material cured during the printing process.
  • the LED is a semiconductor component that emits light by passing electric current through a semiconductor material. It is a semiconductor P-N combination structure.
  • the LED light-emitting process consists of three parts: forward voltage, composite radiation and light energy transmission.
  • the forward voltage is the voltage at the positive and negative ends of the externally loaded LED.
  • the forward voltage causes the electrons in the semiconductor to change from the ground state to the excited state. Since the electrons in the excited state are unstable, they will return to normal after a short period of time without external excitation. To the ground state, electrons recombine with holes and release photons with energy hv-Eg. The photons are transmitted to the outside of the LED through the clean epoxy resin.
  • LED has forward current-voltage characteristics. At low forward bias, the current of the light-emitting diode is dominated by non-radiative recombination current, which is mainly caused by surface recombination around the LED chip. At high forward bias, the current of the light-emitting diode is dominated by radiative diffusion. At a higher bias voltage, the LED current will be limited by the current limiting resistor. The total LED current can be written as:
  • I is the current of the light-emitting diode of the LED
  • I d and I r are the saturation current caused by the diffusion current and the recombination current respectively
  • V is the voltage of the light-emitting diode
  • RS is the resistance of the series resistor
  • q is the amount of charge
  • T is the temperature
  • k is Boltzmann's constant.
  • the recombination current is closely related to the current flowing through the LED.
  • the recombination current can be controlled by controlling the current of the LED, thereby controlling the number of photons and achieving the purpose of controlling the brightness of the LED.
  • the lamp set may be a UV LED lamp set.
  • the light source 120 mainly uses UV LED emitters with a wavelength near 405nm to emit light.
  • the wavelength is not limited to 405nm.
  • it can also be UV light of various bands such as 385nm and 365nm. .
  • the light uniformity of the UV light that shines on the projection surface i.e., the surface of the LCD facing away from the light source 120
  • the light emitted by the light source 120 after passing through the LCD will affect the final print quality.
  • the overall consistency affects the 3D printing effect. Therefore, the light uniformity of the light projected by the light source 120 on the projection surface is crucial for the LCD 3D printer.
  • the doping concentration of different individual LEDs is different, and the doping concentration affects the recombination current generated by holes and electrons. Therefore, even if the current applied to each LED is the same, There are still individual differences in the light intensity of different LEDs. Specifically, the light intensity emitted by the light source 120 after passing through the LCD is different, resulting in light uniformity that is difficult to meet usage requirements. In addition, there are similar problems with the light source 120 composed of COB light sources. Although the semiconductor doping concentration of each LED in the COB produced in the same batch is the same, there are still individual semiconductor doping concentrations for LEDs in different COBs. Differences. Similarly, there are individual differences in the luminous intensity of the light source 120 composed of the COB light source.
  • the light transmittance of the corresponding LCD pixels is adjusted to adjust the light flux of the projection surface of the LCD so that the light flux of the projection surface is consistent, thereby controlling the uniformity of the light passing through the LCD. , to achieve the purpose of uniform light.
  • the corresponding pixel of the LCD is controlled to turn off its polarizer.
  • the corresponding UV light needs to be emitted from inside the pixel. absorption to reduce the light intensity in the area, thereby achieving The purpose of light uniformity.
  • the light source control device 100 in this embodiment may further include a power supply 110 and a current adjustment mechanism 130 .
  • the power supply 110 and the current adjustment mechanism 130 can both be electrically connected to the light source 120.
  • the power supply 110 can be used to provide current to the LED lamp group 121, and the current adjustment mechanism 130 can adjust the driving current of the LED lamp group 121.
  • the light source control device 100 may also include a control mechanism 150 , which may be electrically connected to the selective light-transmitting screen 140 , the power supply 110 and the current regulating mechanism 130 respectively, and be used to control These mechanisms perform tasks, such as controlling the selective light-transmitting screen 140 to selectively transmit light according to the slice data corresponding to the printing task, controlling the power supply 110 to provide current to the light source 120, and controlling the driving current of the LED lamp set of the light source 120 by the current regulating mechanism 130. Make adjustments, etc.
  • control mechanism 150 is not limited to controlling the above-mentioned mechanisms. In some application scenarios, the control mechanism 150 can also be used to control the lifting and lowering of the molding platform 210 of the 3D printer, and control the pickup mechanism to perform pickup, cleaning with a cleaning machine, and curing. Machine curing, etc.
  • the light source control device 100 of the three-dimensional printing device 200 in each of the above embodiments can adjust the light uniformity and the like through the following light source 120 control method.
  • the light source 120 control method of the three-dimensional printing device 200 may include:
  • S102 provides current to multiple LED light groups.
  • the light source 120 needs to be energized to emit light in order to project light to the LCD.
  • the same size of current can be provided to each LED lamp group.
  • different sizes of current can also be passed to different LED lamp groups according to needs.
  • the current value for supplying power to the LED lamp group can be set according to the actual situation.
  • the required light intensity value can be set on the corresponding control software, and the control mechanism 150 can determine the required direction based on the light intensity value.
  • the current supplied by the LED lamp group controls the power supply 110 to supply power to multiple LED lamp groups.
  • this application does not limit the current provided to the LED lamp set to be a constant current or a non-constant current.
  • constant current can be provided to multiple LED lamp groups in this step.
  • the constant current has a constant current value, which means that multiple LED lamp groups can be driven by a constant current.
  • the power supply 110 can be a constant current source, and the constant current can be provided by the constant current source.
  • the constant current source can provide constant current to each LED lamp group under the control of the control mechanism 150, so that each LED The lamp group projects light toward the LCD under the control of the control mechanism 150 .
  • the constant current can also be provided by other power sources outside the light source control device 100 or the three-dimensional printing device 200 , which is not limited here.
  • the constant current source may include a DC-DC or AC-DC power supply 110 converter of Buck, Boost, Buck-Boost, Flyback or LLC topology.
  • the communication method between the control mechanism 150 and the constant current source can adopt IIC bus protocol (Inter Integrated Circuit bus), UART (Universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receiver/Transmitter), At least one of PWM (Pulse width modulation), SPI (Serial Peripheral Interface, serial peripheral interface), etc., to realize the control of the constant current source by the control mechanism 150, which can specifically control the size of the constant current. , on-off time, etc.
  • IIC bus protocol Inter Integrated Circuit bus
  • UART Universal Asynchronous Receiver/Transmitter
  • PWM Pulse width modulation
  • SPI Serial Peripheral Interface
  • serial peripheral interface serial peripheral interface
  • the number of constant current sources i.e., the power supply 110
  • the number of constant current sources can be one, and one constant current source can control multiple LEDs or multiple LED light groups as a whole; while when the light source 120 is composed of a COB light source
  • the number of constant current sources can be the same as the number of COB chips, and they can be connected to multiple COB chips one by one for independent control, so that the operation of multiple COB chips can be controlled according to the actual conditions of different COB chips. Independent and precise control of constant current.
  • multiple constant current sources can also be provided to independently and accurately control each LED lamp group, which is not specifically limited here.
  • the current flowing through the multiple LED lamp groups is constant, and when the current is constant, the current of each LED
  • the recombination current is determined, so the photons emitted by the LED are determined, so the light intensity is a constant value, thus providing a basis for achieving light uniformity on the projection surface.
  • S104 Receive a plurality of first illumination data after the light emitted by the LED lamp group passes through the selective light-transmitting screen 140.
  • the LED lamp group 121 can emit light toward the LCD, and the LCD needs to be opened to make it in a full pass state, so that the light emitted by the LED can Through the entire printing area of the LCD, the light source 120 is controlled based on the entire printing area of the LCD.
  • the plurality of first illumination data here refers to the illumination data corresponding to each of the plurality of LED lamp groups transmitted through the LCD.
  • the first illumination data may include illumination intensity, or may include other parameters, such as at least one of illumination, luminous flux, brightness, gray scale, color gamut and other parameters that can reflect illumination intensity, which are not limited here.
  • the light source control device 100 may also include a light detection mechanism 160 .
  • the mechanism 160 can be connected to the control mechanism 150 and is used to detect a plurality of first illumination data corresponding to each LED lamp group 121.
  • the light detection mechanism 160 may be located on a side of the LCD away from the plurality of LED light groups 121 .
  • the light detection mechanism 160 can be at least one of a photoresistor, a photodiode (such as a UV LED photodiode), a photoelectric sensor, a photometer, an integrating sphere, a camera and other optical detection devices, that is, detection is performed through one of them, Or use two or more combined methods for detection.
  • the photometer can be connected to the control mechanism 150 through USB or other methods, and the photometer collects the illumination intensity of the LED lamp group 121 through the selective light-transmitting screen 140
  • the light intensity can be fed back to the control mechanism 150 through a USB connection, or displayed in a certain manner so that the operator can know it.
  • the light detection mechanism 160 is a camera
  • the camera can be spaced apart from the selective light-transmitting screen 140 and can be installed above the selective light-transmitting screen 140.
  • filters, coatings, and other means can also be added to the camera to protect the camera to prevent light damage to the camera.
  • the light detection mechanism 160 can collect the first illumination data of all LED lamp groups 121 at one time, or can only collect the first illumination data of one or part of the LED lamp groups 121 at a time, so it is necessary to perform Multiple collections are not limited here.
  • the light detection mechanism 160 may include a single or multiple collection ends, and the LCD may be a flat light-transmitting screen.
  • the number of multiple collection terminals can be the same as the number of multiple LED lamp groups 121, and each collection terminal can correspondingly collect the illumination intensity of one LED lamp group 121, so that it can be realized All the first illumination data are acquired at one time; when the light detection mechanism 160 includes a collection end, the collection end can be used to collect the illumination intensity of each LED lamp group 121 successively; of course, in some application scenarios, although the light detection mechanism 160 It only includes one collection end, but this collection end can obtain the first illumination data of multiple LED lamp groups 121 in one collection.
  • the specific selection can be made according to the actual situation, and is not limited here.
  • the light detection mechanism 160 includes a collection end.
  • the LCD uses a flat light-transmitting screen.
  • the plane formed by the multiple LED light groups 121 of the light source 120 is parallel to the plane of the LCD.
  • Different areas of the collection end can collect different LED light groups. 121 light intensity.
  • the area of the collection end can be as large as the area of the selective light-transmitting screen 140, and different areas of the collection end correspond to different LED light groups 121 respectively.
  • the light detection mechanism 160 may not be used as a part of the light source control device 100, but as an external component. When it is necessary to obtain the first light intensity data, it is connected to the control mechanism 150 through USB or type-C. Just connect it and unplug it after use.
  • S106 Adjust the driving currents of the plurality of LED lamp groups according to the relationship between the plurality of first illumination data, so that the plurality of first illumination data of the plurality of LED lamp groups are consistent.
  • step S102 The current provided to each LED lamp group is the same. There may still be a certain difference in the light intensity corresponding to each LED lamp group, and the light intensity after the light passes through the LCD is also different. In order to reduce this difference, the light curing Quality will have adverse effects, and the driving current of the corresponding LED lamp group can be adjusted to make the corresponding illumination intensity of multiple LED lamp groups consistent, so that the illumination intensity after the light passes through the LCD is also consistent to meet the uniformity of light. sexual requirements.
  • the driving current of the LED lamp set can be adjusted through the current adjustment mechanism 130 .
  • the number of the current adjusting mechanism 130 may be one or multiple. No matter it is one or multiple, it can be electrically connected to multiple LED lamp groups 121 respectively, and can be controlled by the control mechanism 150 according to multiple
  • the relationship between the plurality of first illumination data of the LED lamp groups independently adjusts the driving current of the corresponding LED lamp group, so that the plurality of first illumination data of the plurality of LED lamp groups are consistent.
  • the light source control device 100 may also include a communication interface 170.
  • the control mechanism 150 is connected to the current adjustment mechanism 130 through the communication interface 170.
  • the control mechanism 150 is connected to the current adjustment mechanism 130.
  • the communication interface 170 communicates through IIC, UART, PWM or SPI.
  • the current adjustment mechanism 130 in the light source control device 100 of the present application may not be connected to the control mechanism 150. Specifically, the operator can manually operate the corresponding current according to the relationship between multiple first illumination data.
  • the adjustment mechanism 130 is used to adjust the driving current of the corresponding LED lamp group.
  • the current adjustment mechanism 130 may include a driving circuit.
  • each LED lamp group 121 can be electrically connected to the current adjustment mechanism 130 independently, so that the current adjustment mechanism 130 can independently control the driving current of each LED lamp group. For example, when the first LED lamp When the light intensity of one group is weak, the driving current of the first LED lamp group is increased, while the driving current of other LED lamp groups remains unchanged. Or, when the light intensity of the second LED lamp group is relatively strong, the driving current of the second LED lamp group is reduced, while the driving current of the other LED lamp groups remains unchanged, and so on.
  • the driving current of the LED lamp group can be adjusted directly through the current adjustment mechanism 130.
  • the adjustment amplitude for each LED lamp group may be the same or different.
  • the current adjustment mechanism 130 accurately and independently adjusts the driving current of each LED lamp group according to the amplitude that each LED lamp group needs to adjust, so that each LED lamp group corresponds to The first lighting data all meet the requirements.
  • an LED light group may include one LED or multiple LEDs.
  • each LED has a current adjustment mechanism 130 corresponding to the driving current adjustment, thereby enabling independent control of each LED; when an LED lamp group includes multiple LEDs, At this time, the current adjustment mechanism 130 can adjust multiple LEDs located in the same area and the same LED lamp group, thereby enabling regional control of the LEDs; of course, in some application scenarios, multiple LEDs of the same LED lamp group may not be located in the same area, there is no specific limit here.
  • the current adjustment mechanism 130 when the light source 120 is composed of an ordinary LED light source, one end of the current adjustment mechanism 130 is connected to the control mechanism 150 through the communication interface 170, and is further connected to each LED respectively, so as to pass the current adjustment mechanism 130 under the control of the control mechanism 150.
  • the current adjustment mechanism 130 independently and accurately adjusts the driving current of each LED; when the light source 120 is composed of a COB light source, the number of the current adjustment mechanism 130 can be the same as the number of COB chips, and they can be connected to multiple COB chips one by one. Corresponding connections are made to independently adjust the drive current of each COB chip, so that the constant current of each COB chip can be independently and accurately controlled according to the actual conditions of different COB chips.
  • the consistency of the first illumination data is not limited to the fact that the values corresponding to each first illumination data are equal, but can refer to the values corresponding to every two first illumination data in all the first illumination data.
  • the difference between the two is within a certain range. Specifically, the difference between the two can be within a smaller range. For example, this range can make the curing quality of the print obtained by curing under the corresponding light not affected. Impact, or impact, but within an acceptable range.
  • the first illumination data is data that can reflect the illumination intensity of the corresponding LED lamp group. When the multiple first illumination data of the multiple LED lamp groups of the light source 120 are consistent, the light emitted by the light source 120 The intensity of light passing through the LCD is also consistent. This can meet the demand for light uniformity.
  • the driving current of each LED lamp group can be accurately and independently adjusted according to the multiple first light intensity data of each LED lamp group through the current adjustment mechanism 130 and other methods, thereby realizing the control of a single LED ( If each LED corresponds to a pixel of the LCD, pixel-level control can be achieved), or independent and precise control of LEDs in an area, and then the first lighting data of the LED lamp group can be consistent through feedback, so that it emits light.
  • the consistency is better, the independence and accuracy of adjustment are higher, which can improve the light uniformity of the light source 120 on the projection surface; on the other hand, adjusting the light uniformity in this way is different from the selectivity in related technologies.
  • the light-transmitting screen 140 Compared with the way in which the light-transmitting screen 140 itself achieves uniform light, there is no need to use the pixels in the selective light-transmitting screen 140 to absorb the ultraviolet light emitted by the light source 120, which can greatly extend the life of the selective light-transmitting screen 140 to a certain extent.
  • the aging time of the adhesive glue thereby extending the service life of the selective light-transmitting screen 140, especially for the short life of the LCD of the current LCD 3D printer, is undoubtedly a major pain point in the industry; on the other hand, related to the above Compared with other technologies, there is no need for the LCD to absorb UV light for uniform light, which can increase the luminous flux of the LCD to a certain extent, thereby increasing the light transmittance of the LCD and improving the printing quality of the three-dimensional printing device 200 .
  • the aforementioned precise control method may also be combined with the method of light absorption through the LCD itself in related technologies. Compared with the method of completely absorbing light through the LCD itself, a small amount of adjustment of the luminous flux of the LCD is enough. Therefore, unlike the method in related technologies that relies entirely on the LCD for light absorption, it can still reduce the aging of the adhesive inside the LCD and prolong the life of the LCD. The life of the LCD; only a small amount of sacrifice in the luminous flux of the LCD can be achieved to improve the light transmittance of the LCD to a certain extent.
  • the relationship between the plurality of first illumination data of the plurality of LED lamp groups is It can be a relationship between big and small, or a relationship between strength and weakness, high and low, etc.
  • the LED lamp group with a smaller first illumination intensity can be increased.
  • drive current, and/or turn down the first LED with higher light intensity A set of driving currents is used to reduce the difference between the plurality of first illumination intensities, so that the illumination intensity projected by the light source 120 onto the projection surface is uniform. That is to say, the sizes of the multiple first illumination intensities may be inconsistent.
  • the corresponding driving current of the LED lamp group with the corresponding first illumination intensity is smaller can be increased to increase the illumination intensity.
  • the driving current corresponding to the corresponding LED lamp group with higher first illumination intensity can also be adjusted smaller to reduce the first illumination intensity, as long as the first illumination intensities of the multiple LED lamp groups can be made consistent.
  • the light source 120 control method provided by this application is also more flexible for adjusting light uniformity.
  • light uniformity adjustment is achieved by utilizing the selective light-transmitting screen 140 itself to absorb light.
  • the light intensity can only be adjusted in areas with relatively high light intensity.
  • the selective light-transmitting screen 140 such as an LCD, has low light transmittance due to its structural limitations, which is one of the important factors affecting the quality of 3D printing. In this way, the quality of 3D printing will be further affected.
  • the light intensity also needs to be considered. That is, the light intensity of the light emitted by the light source 120 after passing through the selective light-transmitting screen 140 needs to meet a certain level.
  • the requirement for example, needs to be greater than a preset threshold to ensure the printing quality of the three-dimensional printing device 200 .
  • the light source 120 control method of the three-dimensional printing device 200 may also include:
  • S202 Receive a plurality of second illumination data after the light emitted by the plurality of LED lamp groups passes through the selective light-transmitting screen 140.
  • the second illumination data may be the same as or different from the first illumination data. Specifically, it may be the overall illumination data after all the light emitted by all the LED lamp groups of the light source 120 passes through the selective light-transmitting screen 140; In an application scenario, this step can be performed after the uniformity adjustment is completed, so that the first illumination data corresponding to each LED lamp group is consistent, so the second illumination data can also be the illumination data corresponding to a single LED lamp group, here No restrictions.
  • both the second illumination data and the preset illumination data may include illumination intensity, or may include other parameters such as illumination, luminous flux, brightness, grayscale, color gamut, etc. that can reflect illumination. At least one of the intensity parameters is not limited here.
  • the second illumination data can be obtained in the same way as the first illumination data, specifically, it can be obtained through the light detection mechanism 160, and then the illumination intensity detection data can feed back the obtained second illumination data to the control mechanism 150, or It is displayed in a certain way so that the operator can be informed.
  • the specific implementation method for the light detection mechanism 160 to obtain the second illumination data can be the same as mentioned above, and will not be described again here. It should be added that in this method, the light detection mechanism 160 can also directly obtain the overall illumination data after all the light emitted by all the LED lamp groups of the light source 120 has passed through the selective light-transmitting screen 140 .
  • S204 Adjust the constant current according to the relationship between the second illumination data and the preset illumination data, so that the second illumination data is consistent with the preset illumination data.
  • the preset illumination data may be illumination data determined according to the specific structure of the three-dimensional printing device 200, specific requirements for print quality, etc. That is to say, for different three-dimensional printing devices 200, the preset illumination data corresponding to the printed parts
  • the data can be different, or of course can be the same, and there is no limitation here.
  • the consistency between the second illumination data and the preset illumination data mentioned here is not limited to the value corresponding to the second illumination data being equal to the value corresponding to the preset illumination data, but can refer to the difference between the two.
  • the value is within a certain range. Specifically, the difference between the two can be within a smaller range. For example, this range can make the curing quality of the print obtained by curing under the corresponding light better and meet the user's requirements. demand, or although it has an impact, it is within an acceptable range.
  • control mechanism 150 can be used to control the constant current source.
  • the control mechanism 150 can also be adjusted by the operator manually operating the constant current source. There is no specific limit here.
  • the light uniformity may be adjusted first, or the light intensity may be adjusted first, that is, steps S104-S106 may be performed first, and step S202 may be performed first.
  • -S204 comes after, or steps S202-S204 can come before, and steps S104-S106 come after. There is no specific limitation here.
  • adjusting the second illumination data of the light source 120 according to the preset illumination data can control the illumination situation after the light passes through the selective light-transmitting screen 140, thereby improving the printing quality of the three-dimensional printing device 200.
  • both the second illumination data and the preset illumination data include illumination intensity.
  • the constant current when the constant current is adjusted according to the relationship between the second illumination data and the preset illumination data, if the second illumination data corresponds to When the second light intensity does not reach the preset light intensity corresponding to the preset light data, the constant current can be increased to reduce the difference between the second light intensity and the preset light intensity; of course, in some application scenarios , it may also happen that the second illumination intensity corresponding to the second illumination data exceeds the preset illumination intensity corresponding to the preset illumination data. In this case, the constant current can be reduced to reduce the second illumination intensity and the preset illumination intensity. The difference between the intensities, or it can not be adjusted according to actual needs.
  • the adjustment of light uniformity and the adjustment of light intensity can meet the requirements once. In other application scenarios, it may be adjusted once. The requirements may not be met in the end, and multiple adjustments may be required.
  • At least one of the plurality of first illumination data and second illumination data can be received multiple times through cyclic adjustment, that is, in addition to the aforementioned steps S104- In addition to S106 and steps S202-S204, at least one of a plurality of first illumination data and a second illumination data is received at least once, and after receiving a plurality of first illumination data, according to the The relationship between the plurality of first illumination data adjusts the driving current of the corresponding LED lamp group; after receiving the second illumination data, the constant current is adjusted according to the relationship between the second illumination data and the preset illumination data.
  • each step can be performed as many times as required, for example, it needs to be performed 2 times, 3 times, 4 times, etc.
  • the number of executions of the two steps can be the same or different.
  • the light uniformity adjustment is performed once, but the light intensity adjustment is performed once. Executed twice, etc., there is no limit here.
  • the order of each step is not limited.
  • the light uniformity adjustment, light intensity adjustment, and light uniformity adjustment may be performed in sequence, or the light intensity adjustment, light uniformity adjustment, and light intensity adjustment may be performed in sequence, or the light intensity may be adjusted in sequence.
  • Uniformity adjustment, light intensity adjustment, light uniformity adjustment, light intensity adjustment, etc. can be selected according to the actual adjustment situation. There is no limit here, as long as the final light uniformity and light intensity can meet the requirements.
  • the light source 120 may experience light attenuation during the process of emitting light. Therefore, even if the above-mentioned adjustment of the light source 120 is performed, light attenuation will still occur after working for a period of time, and for different LED or COB chips, the light attenuation may be different due to different manufacturing processes and batches. Based on this, please refer to Figure 12.
  • the light source 120 control method may also include:
  • the light attenuation data here can be obtained by using the aforementioned acquisition method of multiple first illumination data and second illumination data.
  • the light detection mechanism 160 can be used to obtain the illumination data of multiple LED lamp groups, and then all the illumination data can be further obtained.
  • the obtained lighting data is compared with the previously adjusted lighting data or the preset lighting data to obtain the light attenuation data.
  • the light attenuation data may be the difference between the currently detected light intensity and the previously adjusted light intensity or the preset light intensity.
  • the light source 120 after obtaining the light attenuation data of multiple LED lamp groups, it can be determined whether the light source 120 suffers from overall light attenuation or partial light attenuation, that is, all LED lamp groups suffer from light attenuation, or only some of the LED lamp groups. Light fade occurs. If the light source 120 as a whole suffers from light attenuation, the constant current of all LED lamp groups can be adjusted for overall compensation, thereby increasing the second illumination intensity of the light source 120 . If light attenuation occurs only partially, you can independently adjust the The driving current of the LED lamp group showing light decay can be independently and accurately compensated, thereby increasing the illumination intensity of a single LED lamp group or a single LED to improve light uniformity.
  • the current of the LED lamp set for compensation when adjusting the current of the LED lamp set for compensation, it can be adjusted manually or automatically under the control of the control mechanism 150.
  • the specific adjustment method can refer to the previous embodiment. , which will not be described again here.
  • step of compensating the light attenuation of the light source 120 can be performed during the 3D printing process of the 3D printing device 200 or before starting the 3D printing process, which is not limited here.
  • the light attenuation of the LED can be compensated for the semiconductor characteristics of the LED, thereby further adjusting the light uniformity or the overall light intensity according to the situation to improve the printing quality and printing effect of the three-dimensional printing device 200 .
  • control mechanism 150 can be controlled through a PID loop or a PID double-loop control method to obtain the required light intensity and light uniformity, and Control the constant current or drive current of the LED.
  • control of the independent current of the LED may include but is not limited to DC current control, PWM current control, digital current control, discrete component current control, etc.
  • the light source 120 of the three-dimensional printing device 200 can be controlled by the following method: 1. Set the required light intensity value through the control software, and control the power supply to the light source 120 according to the light intensity value; 2. Turn on the LCD so that the LCD is in a full pass state; 3. Sample the light intensity of each LED or each LED light group, and calculate the difference in light uniformity; 4. Based on the determined difference in light uniformity, pass the independent and Precise current control adjusts the driving current of the corresponding LED or LED light group so that the light uniformity in the LCD printing area meets the requirements; 5. Detect the difference between the current light intensity and the actual required light intensity; 6.
  • Adjust through the communication control interface The current of the constant current source provided by the light source 120 reaches the required light intensity value; 7. Then sample the light intensity of each LED or each LED lamp group, and calculate the difference in light uniformity; 8. According to the required Based on the determined difference in light uniformity, the driving current of the corresponding LED or LED light group is adjusted through independent and precise current control, so that the light uniformity within the LCD printing area meets the requirements.
  • a three-dimensional printing device including a selective light-transmitting screen is used, by providing multiple LED light groups included in the light sources in the three-dimensional printing device.
  • Driving current receiving a plurality of first illumination data after the light emitted by the plurality of LED lamp groups passes through the selective light-transmitting screen; adjusting the driving current of the plurality of LED lamp groups according to the relationship between the plurality of first illumination data, so as to Make the plurality of first illumination data of the plurality of LED lamp groups consistent.
  • This application can accurately and independently adjust the driving current of each LED lamp group through current adjustment mechanisms and other methods according to the first light intensity data of each LED lamp group, thereby achieving independent and independent control of a single LED or an area of LEDs. Precise control, and then through feedback, makes the first illumination data of the LED lamp group consistent, making its light output consistency better, adjustment independence and accuracy higher, thereby improving the light uniformity of the light source on the projection surface.
  • Technical effect on the other hand, by adjusting the light uniformity in this way, compared with the method of achieving light uniformity through the selective light-transmitting screen itself in related technologies, there is no need or only a small amount of use in the selective light-transmitting screen.
  • the pixels absorb the ultraviolet light emitted by the light source, which can greatly extend the aging time of the adhesive in the selective light-transmitting screen to a certain extent, thereby achieving the technical effect of extending the service life of the selective light-transmitting screen; on the other hand, , compared with related technologies, this application does not need to absorb UV light through a selective light-transmitting screen for uniformity.
  • Light can be used to increase the luminous flux of the selective light-transmitting screen to a certain extent, thereby achieving the technical effect of increasing the light transmittance of the selective light-transmitting screen and improving the printing quality of the three-dimensional printing equipment.

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Abstract

本申请提供了一种三维打印设备及其光源控制方法、装置，涉及光源控制技术领域。该三维打印设备包括选择性透光屏，光源包括多个LED灯组，该光源控制方法包括：向多个LED灯组提供电流，接收LED灯组发出的光线透过选择性透光屏后的多个第一光照数据，依据多个第一光照数据之间的关系调节对应的LED灯组的驱动电流，以使多个LED灯组的第一光照数据一致。本申请提供的三维打印设备及其光源控制方法、装置具有稳定性更强，出光一致性更好，且延长了选择性透光屏使用寿命的优点。

Description

三维打印设备及其光源控制方法、装置
本申请要求于2022年6月23日提交中国专利局、申请号为202210719563.0、发明名称为“三维打印设备及其光源控制方法、装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光源控制技术领域，具体而言，涉及一种三维打印设备及其光源控制方法、装置。
背景技术
目前市面上的存在的3D打印机技术种类很多，根据不同的增量工艺主要区别在于层叠方法和使用的材料，例如立体光固化成型(Stereo lithography Apparatus，SLA)、挤压型的熔融沉积成型(Fused Deposition Modelling，FDM)、颗粒型的选择性激光烧结(Selective Laser Sintering，SLS)、层积型的分层实体制造(Laminated Object Manufacturing，LOM)以及光聚合型的数字光处理技术(Digital Light Processing，DLP)等。
相关技术中，已经研制LCD掩膜技术(LCD masking)使用在3D打印技术中，最早的创客用普通电脑LCD(液晶显示屏，liquid crystal display)显示器去掉背光板，加上405nm的UV(Ultra Violet)LED(Light Emitting Diode)灯珠做背光灯板，实现在LCD的光固化3D打印。然而当前的LCD 3D打印技术尚存在一些缺点，而难以满足用户的使用需求。
发明内容
本申请的目的在于提供一种三维打印设备及其光源控制方法、装置，以解决三维打印设备中选择性透光屏的使用寿命不长的问题。
为了实现上述目的，本申请实施例采用的技术方案如下：
第一方面，本申请实施例提供了一种三维打印设备的光源控制方法，三维打印设备包括选择性透光屏，光源包括多个LED灯组，光源控制方法包括：
向多个LED灯组提供电流；
接收多个LED灯组发出的光线透过选择性透光屏后的多个第一光照数据；
依据多个第一光照数据之间的关系调节多个LED灯组的驱动电流，以使多个LED灯组的多个第一光照数据一致。
可选地，多个第一光照数据包括多个第一光照强度，依据多个第一光照数据之间的关系调节多个LED灯组的驱动电流，以使多个LED灯组的多个第一光照数据一致的步骤，包括：
在多个第一光照数据包括的多个第一光照强度中的至少部分不相等时，调大多个第一光照强度中第一光照强度较小的LED灯组的驱动电流，和/或调小多个第一光照强度中第一光照强度较大的LED灯组的驱动电流，以减小多个第一光照强度之间的差值。
可选地，向多个LED灯组提供驱动电流的步骤包括：向多个LED灯组提供恒流电流；光源控制方法还包括：
接收多个LED灯组发出的光线透过选择性透光屏后的第二光照数据；
依据第二光照数据与预设光照数据之间的关系调节恒流电流，以使第二光照数据与预设光照数据一致。
可选地，第二光照数据包括第二光照强度，预设光照数据包括预设光照强度，依据第二光照数据与预设光照数据之间的关系调节恒流电流，以使第二光照数据与预设光照数据一致的步骤，包括：
在第二光照数据包括的第二光照强度未达到预设光照数据包括的预设光照强度时，增大恒流电流，以减小第二光照强度与预设光照强度之间的差值。
可选地，还包括：
至少一次接收多个第一光照数据和第二光照数据中的至少一者；
在接收到多个第一光照数据后，依据多个LED灯组的多个第一光照数据之间的关系调节多个LED灯组的驱动电流；
在接收到第二光照数据后，依据第二光照数据与预设光照数据之间 的关系调节恒流电流。
可选地，还包括：
获取多个LED灯组的光衰数据；
依据光衰数据调节恒流电流和驱动电流中的至少一者，以使多个LED灯组的多个第一光照数据一致和/或第二光照数据光照强度与预设光照数据一致。
可选地，多个LED灯组中的每个LED灯组包括多个LED，或多个LED灯组中的每个LED灯组包括一个LED。
第二方面，本申请实施例还提供了一种光源控制装置，应用于三维打印设备，光源控制装置包括：
选择性透光屏，设置为选择性透光；
光源，包括多个LED灯组，其中，多个LED灯组设置为向选择性透光屏投射光线；
电源，与光源电连接，设置为向多个LED灯组提供驱动电流；
电流调节机构，与多个LED灯组中的每个LED灯组电连接，设置为依据多个LED灯组的多个第一光照数据之间的关系调节对应的LED灯组的驱动电流，以使多个LED灯组的多个第一光照数据一致；
其中，多个第一光照数据为多个LED灯组所投射的光线透过选择性透光屏后的光照数据。
可选地，还包括光检测机构，光检测机构设置为检测多个LED灯组投射的光线透过选择性透光屏后的多个第一光照数据。
可选地，光检测机构包括光敏电阻、光电二极管、光电传感器、光度计、积分球、摄像头中的至少一种。
可选地，多个LED灯组中的每个LED灯组包括多个LED，或多个LED灯组中的每个LED灯组包括一个LED。
可选地，电源为恒流源，并设置为向多个LED灯组提供恒流电流。
可选地，在所述光源控制装置包括多个电源的情况下，多个电源的数量与多个LED灯组的数量相同，多个电源与多个LED灯组一一对应电连接。
可选地，光源为COB光源，多个LED灯组中的每个LED灯组包括一个COB芯片。
第三方面，本申请实施例还提供了一种三维打印设备，包括料盘、成型平台及上述的光源控制装置，料盘设置为盛放打印材料，打印材料设置为在光源的照射下逐层形成在成型平台上以得到打印件。
相对于现有技术，本申请实施例具有以下有益效果：
本申请实施例提供了一种三维打印设备及其光源控制方法、装置，一方面，能够根据各LED灯组的第一光照强度数据通过电流调节机构等方式对每个LED灯组的驱动电流进行精准、独立地调节，从而实现对单个LED，或者一个区域的LED的独立且精准的控制，进而通过反馈的方式使得LED灯组的第一光照数据一致，使得其出光一致性更好，调节的独立性、准确度更高，从而能够提高光源在投影面的光均匀性；另一方面，通过这种方式对光均匀性进行调节，与相关技术当中通过选择性透光屏本身实现匀光的方式相比，无需或仅需少量利用选择性透光屏中的像素点吸收光源所发出的紫外光，从而在一定程度上能够大大延长选择性透光屏中的粘合胶的老化时间，从而延长选择性透光屏的使用寿命；再一方面，与上述相关技术相比，无需通过选择性透光屏吸收UV光来进行匀光，从而能够在一定程度上提高选择性透光屏的光通量，进而提高选择性透光屏的透光率，改善三维打印设备的打印质量。
为使本申请的上述目的、特征和优点能更明显易懂，下文特举较佳实施例，并配合所附附图，作详细说明如下。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它相关的附图。
图1为本申请实施例提供的三维打印设备的一种结构示意图。
图2为本申请实施例提供的光源控制装置的第一种模块示意图。
图3为本申请实施例提供的光源的一种电路示意图。
图4为本申请实施例提供的光源的另一种电路示意图。
图5为本申请实施例提供的光源控制装置的第二种模块示意图。
图6为本申请实施例提供的三维打印设备的光源控制方法的示例性流程图。
图7为本申请实施例提供的光源控制装置的第三种模块示意图。
图8为本申请实施例提供的光源控制装置的第四种模块示意图。
图9为本申请实施例提供的LED灯组、选择性透光屏以及光检测机构的位置示意图。
图10为本申请实施例提供的光源控制装置的第五种模块示意图。
图11为本申请实施例提供的三维打印设备的光源控制方法的另一示例性流程图。
图12为本申请实施例提供的三维打印设备的光源控制方法的又一示例性流程图。
图中：
100-光源控制装置；110-电源；120-光源；121-LED灯组；130-电流调节机构；140-选择性透光屏；150-控制机构；160-光检测机构；170-通信接口；200-三维打印设备；210-成型平台；220-料盘；230-机架。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定， 术语“设置”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
请参阅图1，本申请实施例提供一种三维打印设备200，该三维打印设备200可包括用于对打印材料进行成型以得到打印件的3D打印机，或者还可以包括用于将打印件从3D打印机上取下的取件机、用于对取下的打印件进行清洗的清洗机、用于对打印件进行再次固化的光固化机等中的至少一者，此处不做限定。
在一实施例中，3D打印机可包括料盘220、成型平台210、光源控制装置100等，以及用于安装上述结构的机架230。其中，料盘220用于盛放打印材料，本申请中的打印材料可以是液态的光固化材料，可通过一定波长的光线照射而固化，从而形成具有一定强度的、固态的打印件，例如可见光固化材料、紫外光固化材料等，具体可以是光敏树脂。成型平台210位于料盘220的一侧，并在控制下升降，以使成型平台210的成型面浸入料盘220所盛放的打印材料中，或者从打印材料中移出。光源控制装置100则可位于料盘220的背离成型平台210的一侧，用于向料盘220一侧投射光线，以使得打印材料在光线的照射下逐层固化在成型平台210的成型面上，从而得到打印件。
进一步结合图2，在一实施例中，光源控制装置100可包括选择性透光屏140及光源120。
其中，选择性透光屏140可设置于料盘220的背离成型平台210的一侧，并位于料盘220与光源120之间，在进行3D打印时，光源120所发出的光线透过选择性透光屏140后照射在料盘220内的打印材料上，从而使得打印材料固化在成型平台210上。
具体地，光源120可包括多个LED灯组，可发射可见光和/或紫外 光，其中每个LED灯组可包括一个LED，或者多个LED，此处不做限定。其中，光源120可以为普通的LED光源，或者COB光源等，光源120可以是各种类型的带光学镜头的LED光源。相应地，在光源120是普通的LED光源时，LED灯组可包括一个或者多个LED；而在光源120是COB光源时，每个LED灯组可包括一个COB芯片，此时，每个LED灯组则可包括多个LED。请分别参阅图3和图4，图3展示了普通LED光源构成本发明提供的光源120的架构，图4展示了COB光源构成本发明提供的光源120的架构，其中，对于普通LED光源构成的光源120，可以包括多个普通的LED，且多个普通的LED之间可以串联也可以并联。而对于COB光源构成的光源120，可以包括多个COB光源，多个COB光源之间可以互相独立连接。
进一步地，选择性透光屏140可实现选择性透光，例如选择性透光屏140可根据打印任务对应的切片数据进行全部区域或者选择性的部分区域透光，当然也可不透光。具体地，在3D打印机工作期间，光源120包括的多个LED灯组朝向选择性透光屏140发光，选择性透光屏140全面透光或部分区域透光，从而将多个LED灯组所发射的光线至少部分投射至料盘220所盛放的打印材料，从而使得打印材料固化成型。具体地，选择性透光屏140可以是LCD，或其它具有类似功能的屏，在此不做限定。
在一实施例中，选择性透光屏140是LCD，3D打印机是LCD 3D打印机，并具有诸多优点。首先，价格便宜。可以理解地，LCD 3D打印机的核心成像部件是LED光源以及LCD，而这两者相对于DLP 3D打印机的光机或者SLA 3D打印机的激光振镜来说都是比较便宜的。其次，架构简单。LCD 3D打印机的核心结构为丝杆带动着成型平台210，在LCD上进行打印；而DLP 3D打印技术中，通过LED光学器件发射的光线照射到数字微镜(Digital Micro-mirror Device，DMD)上进行反射，然后成像；另外，在SLA的3D打印技术中则通过激光振镜来成像，相比之下，LCD 3D打印机的架构是比较简单的。再次，分辨率高。目前市面上在售的LCD 3D打印机的屏幕均为4k的分辨率，在研发或者 在预售的打印机约为6-8k分辨率，甚至10k分辨率，这相比于DLP 3D打印机中通过抖动成像4k分辨率，LCD 3D打印机的屏幕分辨率是很高的。
然而，虽然LCD具有较好的性能，但LCD 3D打印技术仍有一些缺点，例如，LCD的寿命较短，因此用户在使用LCD 3D打印机时需要定期或不定期更换LCD；其次，LCD的透光率不高，这会对打印过程中打印材料进行固化的质量造成一定的影响。
为了更加清楚地理解本申请中的技术方案，此处简单介绍一下LED的发光原理和LCD的工作原理。
LED是电流通过半导体物质从而发光的半导体元器件，是一种半导体的P-N结合的结构。LED发光过程包括三个部分：正向电压、复合辐射和光能传输。正向电压是外部加载LED正负两端的电压，正向电压让半导体内的电子从基态变为激发态，由于激发态中电子不稳定，经过短暂时间后，不需要外部激发，它就会回到基态，电子与空穴复合，并释放出能量为hv-Eg的光子，光子通过洁净的环氧树脂传递到LED外部。
LED具有正向电流-电压特性，在低正向偏压时，发光二极管的电流是以非辐射性的复合电流为主，它主要是由LED芯片周围的表面复合所引起。在高正向偏压时，发光二极管的电流则是以辐射性扩散为主。在更高的偏压时，发光二极管电流将会受到限流电阻所限制发光二极管的总电流可以写成：
上式中I为LED的发光二极管的电流，Id及Ir分别为扩散电流及复合电流所引起的饱和电流，V是发光二极管的电压，RS是串联电阻的阻值，q是电荷量，T是温度，k是玻尔兹曼常数。
从上式能够看出，复合电流与流过LED的电流密切相关，可以通过控制LED的电流来控制复合电流，从而控制光子数量，达到控制LED亮度的目的。
进一步地，本实施例中，LCD 3D打印机的光源120的多个LED 灯组均可以是UV LED灯组，该光源120中主要使用波长在405nm附近的UV LED发光体进行发光，当然，并不限定于405nm波长，例如还可以是385nm、365nm等各个波段的UV光。
由于LCD的内部结构多且复杂，而复杂的结构通常均需要通过粘合胶进行粘合，而且该粘合胶通常为有机胶，然而有机胶对于UV光的耐久性较差。在LCD 3D打印机中，LCD工作时，若对应的像素点呈黑色，即不透光，则对应的偏振片呈关闭状态，此时，光源120所照射的所有的UV光均由该像素内部进行吸收，从而会加速粘合胶的老化，使得LCD失效，从而缩短LCD的使用寿命。
在LCD 3D打印机中，照射在投影面(即LCD的背离光源120的面)上的UV光，即光源120发出的光线透过LCD后的UV光的光均匀性会影响最终得到的打印件的整体一致性，从而影响3D打印效果，因此光源120所投射的光线在投影面的光均匀性对于LCD 3D打印机来说至关重要。
由于对于普通LED光源构成的光源120来说，不同的LED个体的掺杂浓度存在差异，掺杂浓度又对空穴和电子产生的复合电流有影响，因此即便向各个LED施加的电流相同，但是不同LED的发光照强度仍存在个体差异。具体地，光源120所发出的光线在透过LCD后的光照强度是不同的，从而导致光均匀性难以满足使用需求。此外，对于COB光源构成的光源120也有相似问题，虽然在同一个批次生产的COB内的每个LED的半导体掺杂浓度相同，但是对于非同一COB内的LED仍存在半导体个体的掺杂浓度差异，相似地，COB光源构成的光源120的发光照强度也存在个体差异。
相关技术中，为了解决上述问题，通过调整对应的LCD的像素点的透光率，从而调整LCD的投影面的光通量，使得投影面的光通量一致，从而对透过LCD的光线的均匀性进行控制，达到光均匀的目的。具体地，例如在投影面部分区域光照强度较强，而另一部分光照强度较弱时，则控制LCD对应的像素点工作，使其偏振片关闭，此时对应的UV光则需要由该像素内部吸收，以降低该区域的光照强度，从而实现 光均匀的目的。然而，一方面，在这种方式下，由于部分的UV光会被LCD本身所吸收，从而需要以牺牲LCD的透光率为代价来实现光均匀，如此会在一定程度上降低投影面的光照强度，从而影响打印质量；另一方面，如此会加速粘合胶的老化，使得LCD失效，从而缩短LCD的使用寿命，为用户使用带来不便，且提高用户的使用成本。
进一步参阅图2，本实施例中的光源控制装置100还可包括电源110以及电流调节机构130。该电源110和电流调节机构130均可与光源120电连接，其中，电源110可用于向LED灯组121提供电流，电流调节机构130则可对LED灯组121的驱动电流进行调节。
在另一实施例中，请参阅图5，光源控制装置100还可包括控制机构150，该控制机构150可分别与选择性透光屏140、电源110以及电流调节机构130电连接，并用于控制这些机构执行任务，例如根据打印任务对应的切片数据控制选择性透光屏140进行选择性透光，控制电源110向光源120提供电流、控制电流调节机构130对光源120的LED灯组的驱动电流进行调节等。
需要说明的是，控制机构150可不限定于控制上述机构，在一些应用场景中，控制机构150还可用于控制3D打印机的成型平台210进行升降，控制取件机构执行取件、清洗机清洗、固化机固化等。
具体地，上述各实施例中的三维打印设备200的光源控制装置100均可通过如下的光源120控制方法进行光均匀性等的调节。
作为一种实现方式，请参阅图6，该三维打印设备200的光源120控制方法可包括：
S102，向多个LED灯组提供电流。
可以理解地，在进行光均匀性调节前，需要先向光源120通电使其发光，以向LCD投射光线。具体地，本实施例中可对每个LED灯组提供相同大小的电流，当然，在其它实施例中也可以根据需求向不同的LED灯组通不同大小的电流。其中，向LED灯组供电的电流值可以根据实际情况进行设定。在一些应用场景中，可在相应的控制软件上设定所需要的光照强度值，控制机构150可依据该光照强度值确定需要向 LED灯组供电的电流，从而控制供电源110向多个LED灯组供电。
进一步地，本申请中不限定向LED灯组提供的电流是恒流电流，或者非恒流电流。在本实施例中，该步骤中可向多个LED灯组提供恒流电流。其中，该恒流电流具有恒定的电流值，也就是说多个LED灯组均可由恒定的电流驱动。
具体地，电源110可以是恒流源，该恒流电流则可由恒流源提供，具体地，恒流源可在控制机构150的控制下向各个LED灯组提供恒流电流，从而使得各LED灯组在控制机构150的控制下朝向LCD投射光线。在其它应用场景中，该恒流电流也可以由光源控制装置100之外或者三维打印设备200之外的其他电源提供，此处不做限定。
具体地，恒流源可包括Buck、Boost、Buck-Boost、Flyback或LLC等拓扑的DC-DC或AC-DC电源110转换器。进一步地，本实施例中，控制机构150与恒流源之间的通信方式可以采用IIC总线协议(Inter Integrated Circuit，集成电路总线)、UART(Universal Asynchronous Receiver/Transmitter，通用异步收发传输器)、PWM(Pulse width modulation，脉冲宽度调制)、SPI(Serial Peripheral Interface，串行外设接口)等中的至少一种，以实现控制机构150对恒流源的控制，具体可控制恒流电流的大小、通断时间等。
更进一步地，结合图7和图8，本实施例中对于不同的光源120的控制方式也不做限定。例如，在光源120由普通LED光源构成时，恒流源(即电源110)的数量可以为一个，一个恒流源可整体控制多个LED或多个LED灯组；而在光源120由COB光源构成时，恒流源的数量可与COB芯片的数量相同，且分别与多个COB芯片一一对应连接以进行一一独立控制，即可根据不同的COB芯片的实际情况对多个COB芯片的恒流电流的独立、精准控制。当然，在其它实施例中，在光源120由普通LED光源构成时，也可以设置多个恒流源以对各个LED灯组进行独立、精准控制，此处不做具体限定。
可以理解地，通过设置恒流源控制多个LED灯组的驱动电流，使得流经多个LED灯组的电流恒定，而在电流恒定的情况下，各LED的 复合电流确定，因此LED的发出光子确定，因此光照强度为恒定值，从而为实现投影面光均匀性提供基础。
S104，接收LED灯组发出的光线透过选择性透光屏140后的多个第一光照数据。
如前所述，在将LED灯组121接通恒流电流后，LED灯组121能够发射出朝向LCD的光线，而且需要打开LCD，使其处于全通过状态，从而使得LED所发出的光线能够透过LCD整个打印区域，以便基于LCD的整个打印区域进行对光源120的控制。
需要说明的是，由于光源120包括多个LED灯组，此处的多个第一光照数据是指对应于多个LED灯组中每个LED灯组透过LCD后的光照数据。
具体地，第一光照数据可包括光照强度，或者可以包括其它参数，例如照度、光通量、亮度、灰度、色域等其它能够反映光照强度的参数中的至少一种，此处不做限定。
进一步地，在一实施例中，请参阅图9，为了获取每个LED灯组121发出的光线透过LCD后的第一光照数据，光源控制装置100还可包括光检测机构160，该光检测机构160可与控制机构150连接，并用于检测与各个LED灯组121对应的多个第一光照数据。
具体地，至少在获取第一光照数据时，光检测机构160可位于LCD的远离多个LED灯组121的一侧。
其中，光检测机构160可以为光敏电阻、光电二极管(如UV LED光电二极管)、光电传感器、光度计、积分球、摄像头等光学检测器件中的至少一种，即通过其中的一种进行检测，或者两种及以上的复合手段进行检测。具体地，当光检测机构160为光度计时，该光度计可与控制机构150通过USB连接，或者通过其它方式连接，该光度计采集的LED灯组121透过选择性透光屏140的光照强度后，可通过USB连接将该光照强度反馈至控制机构150，或者通过一定的方式显示出来，使操作人员能够获知。在光检测机构160为摄像头时，该摄像头可与选择性透光屏140间隔设置，并可安装于的选择性透光屏140的上方，在需 要获取第一光照数据时，可以拍摄光线透过选择性透光屏140的照片，然后提取照片中的灰度或亮度等信息得到每个灯组对应的第一光照数据，并进而反馈至控制机构150，或者通过一定的方式显示出来，使操作人员能够获知。而且在光检测机构160为摄像头时，还可对摄像头增加滤镜、镀膜等手段对摄像头进行保护，以防光线损伤摄像头。
在一实施例中，光检测机构160能够实现一次性采集所有LED灯组121的第一光照数据，或者也可以是一次仅能采集一个或部分LED灯组121的第一光照数据，从而需要进行多次采集，此处不做限定。
在具体的应用场景中，光检测机构160可包括单个或多个采集端，LCD可为平面透光屏。其中，当光检测机构160包括多个采集端时，多个采集端的数量可与多个LED灯组121的数量相同，每个采集端可对应采集一个LED灯组121的光照强度，从而可实现一次获取全部的第一光照数据；当光检测机构160包括一个采集端时，可以使用该一个采集端逐次采集每一个LED灯组121的光照强度；当然在一些应用场景中，光检测机构160虽仅包括一个采集端，但该采集端可实现一次采集便获取多个LED灯组121的第一光照数据，具体可根据实际情况进行选择，此处不做限定。
在一应用场景中，光检测机构160包括一个采集端，LCD采用平面透光屏，光源120的多个LED灯组121形成的平面与LCD的平面平行，采集端的不同区域可采集不同LED灯组121的光照强度。例如，采集端的面积可与选择性透光屏140的面积等大，并且采集端的不同区域分别对应不同的LED灯组121。
在一实施例中，光检测机构160也可以不作为光源控制装置100的一部分，而作为外部构件，在需要获取第一光照强度数据时，将其通过USB或type-C等方式与控制机构150连接起来，在使用完毕后，再将其拔下即可。
S106，依据多个第一光照数据之间的关系调节多个LED灯组的驱动电流，以使多个LED灯组的多个第一光照数据一致。
如上所述，由于半导体掺杂浓度的差异，因此，即便是在步骤S102 中向每个LED灯组提供的电流相同，每个LED灯组对应的光照强度仍可能存在一定的差异，而且在光线透过LCD后的光照强度也具有差异，为了降低这种差异对光固化质量带来不利影响，可以对相应的LED灯组的驱动电流进行调节，以使得多个LED灯组对应的光照强度一致，从而使得在光线透过LCD后的光照强度也一致，以满足光均匀性要求。
其中，对LED灯组的驱动电流的调节可以通过电流调节机构130进行。具体地，电流调节机构130的数量可以为一个也可以为多个，无论是一个还是多个，均能够实现与多个LED灯组121分别电连接，并可在控制机构150的控制下依据多个LED灯组的多个第一光照数据之间的关系独立调节对应的LED灯组的驱动电流，使得多个LED灯组的多个第一光照数据一致。具体地，作为一种可选的实现方式，请参阅图10，光源控制装置100还可包括通信接口170，控制机构150通过通信接口170与电流调节机构130连接，可选地，控制机构150与通信接口170通过IIC、UART、PWM或SPI等方式进行通信。
在另一应用场景中，本申请光源控制装置100中的电流调节机构130也可以不与控制机构150连接，具体地，操作人员可以根据多个第一光照数据之间的关系手动操作对应的电流调节机构130，从而实现对应的LED灯组的驱动电流的调节。
在一实施例中，电流调节机构130可包括驱动电路，在一种实现方式中，驱动电路可以为多个，使得每个驱动电路均可调节一个LED灯组121的电流，或者，驱动电路也可以仅为一个，该驱动电路可与不同的LED灯组相连，进而调节不同LED灯组的驱动电流。
在一具体的实现方式中，每个LED灯组121均可独立与电流调节机构130电连接，使得电流调节机构130能够独立控制每个LED灯组的驱动电流，例如，当第一个LED灯组的光照强度较弱时，则提升第一个LED灯组的驱动电流，维持其它LED灯组的驱动电流不变。或者，当第二个LED灯组的光照强度较强时，则降低第二个LED灯组的驱动电流，维持其它LED灯组的驱动电流不变，以此类推。
另外，需要调节的LED灯组可能有一个或者多个，在调节的LED 灯组只有一个时，直接通过电流调节机构130调节该LED灯组的驱动电流即可，而在调节的LED灯组有多个时，每个LED灯组需要调节的幅度可能相同也可能不同，相应地，电流调节机构130在控制机构150的控制下，依据每个LED灯组需要调节的幅度对每个LED灯组的驱动电流进行精准且独立的调节，从而使得每个LED灯组对应的第一光照数据均满足要求。
进一步地，如前所述，一个LED灯组可包括一个LED或多个LED。在一个LED灯组包括一个LED时，可以理解地，每个LED均具有对应进行驱动电流调节的电流调节机构130，从而能够实现对每个LED的独立控制；在一个LED灯组包括多个LED时，电流调节机构130可调节位于同一区域、同一LED灯组的多个LED，从而能够实现对LED的区域控制；当然，在一些应用场景中，同一LED灯组的多个LED也可不位于同一区域，此处不做具体限定。
继续参阅图7和图8，在光源120由普通LED光源构成时，电流调节机构130一端通过通信接口170与控制机构150连接，并进而与各个LED分别连接，以在控制机构150的控制下通过电流调节机构130对每一LED的驱动电流进行独立、精准调节；而在光源120由COB光源构成时，电流调节机构130的数量可与COB芯片的数量相同，且分别与多个COB芯片一一对应连接以对每一COB芯片进行独立的驱动电流调节，即可根据不同的COB芯片的实际情况对每个COB芯片的恒流电流的独立、精准控制。
需要说明的是，这里的第一光照数据一致，并不限定于每个第一光照数据对应的数值都相等，而可指所有的第一光照数据中，每两个第一光照数据对应的数值之间的差值在一定的范围内，具体可以是二者之间的差值在一个较小的范围内，例如该范围可以使得在对应的光照下进行固化得到的打印件的固化质量不受影响，或者虽有影响，但是在可接受的范围内。另外，如前所述，第一光照数据是能够反映对应的LED灯组的光照强度的数据，在光源120的多个LED灯组的多个第一光照数据一致时，该光源120所发射的光线透过LCD的光照强度也是一致的， 从而能够满足光均匀性的需求。
上述方式中，一方面，能够根据各LED灯组的多个第一光照强度数据通过电流调节机构130等方式对每个LED灯组的驱动电流进行精准、独立地调节，从而实现对单个LED(若每个LED对应LCD的一个像素，则可实现像素级的控制)，或者一个区域的LED的独立且精准的控制，进而通过反馈的方式使得LED灯组的第一光照数据一致，使得其出光一致性更好，调节的独立性、准确度更高，从而能够提高光源120在投影面的光均匀性；另一方面，通过这种方式对光均匀性进行调节，与相关技术当中通过选择性透光屏140本身实现匀光的方式相比，无需利用选择性透光屏140中的像素点吸收光源120所发出的紫外光，从而在一定程度上能够大大延长选择性透光屏140中的粘合胶的老化时间，从而延长选择性透光屏140的使用寿命，尤其是对于当前LCD3D打印机的LCD的寿命短的问题，无疑是解决行业中的一大痛点；再一方面，与上述相关技术相比，无需通过LCD吸收UV光来进行匀光，从而能够在一定程度上提高LCD的光通量，进而提高LCD的透光率，改善三维打印设备200的打印质量。
另外，在一实施例当中，在对光源120进行控制时，也可以采用前述精准控制方法与相关技术中通过LCD本身进行光吸收的方法相结合的方式进行。相对于完全由LCD本身通过光吸收的方式来说，进行少量调整LCD的光通量即可，从而与相关技术中的完全依靠LCD进行光吸收的方式，仍能够减少LCD内部粘结胶的老化，延长LCD的寿命；仅需少量牺牲LCD的光通量，从而在一定程度上能够提高LCD的透光率。
进一步地，在根据多个LED灯组的多个第一光照数据之间的关系调节对应的LED灯组的驱动电流的步骤中，多个LED灯组的多个第一光照数据之间的关系可以为大小关系，或者强弱、高低等关系。
具体地，以第一光照数据为光照强度为例，在多个第一光照数据对应的第一光照强度中的至少部分不相等时，可以通过调大第一光照强度较小的LED灯组的驱动电流，和/或调小第一光照强度较大的LED灯 组的驱动电流，以减小多个第一光照强度之间的差值，从而使得光源120投射到投影面的光照强度均匀。也就是说，多个第一光照强度之间的大小可能不一致，在进行调节时，既可以使对应的第一光照强度较小的LED灯组对应的驱动电流调大，以增大该光照强度，也可以使对应的第一光照强度较大的LED灯组对应的驱动电流调小，以减小该第一光照强度，只要能够使得多个LED灯组的第一光照强度一致即可。
通过上述方式，本申请提供的光源120控制方法对于光均匀性的调节也更加灵活。相关技术中，通过利用选择性透光屏140本身吸收光的方式实现光均匀性调节，而利用这种方式进行光均匀性的调节时，只能将光照强度相对较高的区域的光照强度调低来实现，但无法将光照强度相对较低的区域调高，也就是说，这种光均匀性调节方法需要以牺牲选择性透光屏140的透光率为代价。然而，选择性透光屏140，例如LCD，因自身结构的限制导致其透光率较低是影响3D打印质量的重要因素之一，如此，通过这种方式会进一步影响3D打印质量。而本申请上述方式中，通过精准的调控对应LED灯组的驱动电流，除了能够通过使对应的光照强度较大的LED灯组对应的驱动电流调小，以减小该光照强度之外，还可以使对应的光照强度较小的LED灯组对应的驱动电流调大，以增大该光照强度，从这个角度来说，在以本申请中的上述方式对光均匀性进行调节时，通过调高部分LED灯组的驱动电流的方式来实现光均匀性的方法无需牺牲选择性透光屏140的透光率，从而与相关技术中的方案相比，能够在一定程度上提高选择性透光屏140的透光率，从而改善三维打印设备200的打印质量。
进一步地，在对光源120进行调节、控制时，除了需考虑光均匀性之外，还需要考虑光照强度，即光源120发出的光线透过选择性透光屏140后的光照强度需要满足一定的要求，例如需要大于预设的阈值，以保证三维打印设备200的打印质量。在此基础上，请参阅图11，该三维打印设备200的光源120控制方法还可包括：
S202，接收多个LED灯组发出的光线透过选择性透光屏140后的多个第二光照数据。
需要说明的是，第二光照数据可与第一光照数据相同或者不同，具体可以是光源120的所有LED灯组所发出的光线全部透过选择性透光屏140后的整体的光照数据；在一应用场景中，该步骤可以在均匀性调节完成后进行，因此各LED灯组对应各自的第一光照数据一致，因此该第二光照数据也可以是单个LED灯组对应的光照数据，此处不做限定。
与前述的第一光照数据相似，此处的第二光照数据和预设光照数据均可包括光照强度，或者可以包括其它参数，例如照度、光通量、亮度、灰度、色域等其它能够反映光照强度的参数中的至少一种，此处不做限定。相应地，该第二光照数据的获取方式也可与第一光照数据相同，具体可通过光检测机构160获取，然后光照强度检测数据可将获取到的第二光照数据反馈至控制机构150，或者通过一定的方式显示出来，使操作人员能够获知。光检测机构160获取第二光照数据的具体实现方式可以前述相同，此处不再赘述。需要补充说明的是，在该方式中，光检测机构160还可以直接获取光源120的所有LED灯组所发出的光线全部透过选择性透光屏140后的整体的光照数据。
S204，依据第二光照数据与预设光照数据之间的关系调节恒流电流，以使第二光照数据与预设光照数据一致。
其中，预设光照数据可以是根据三维打印设备200的具体结构、对打印质量的具体要求等所确定的光照数据，也就是说，对于不同的三维打印设备200、打印件所对应的预设光照数据可以不同，当然也可以相同，此处不做限定。
需要说明的是，这里所说的第二光照数据与预设光照数据一致，并不限定于第二光照数据对应的数值与预设光照数据对应的数值相等，而可指二者之间的差值在一定的范围内，具体可以是二者之间的差值在一个较小的范围内，例如该范围可以使得在对应的光照下进行固化得到的打印件的固化质量较好、满足用户的需求，或者虽有影响，但是在可接受的范围内。
另外，在调节恒流电流时，具体可通过控制机构150控制恒流源进 行调节，当然，也可以通过操作人员手动操作恒流源进行调节，此处不做具体限定。
进一步需要说明的是，在实际对光源120进行调节、控制时，可以先执行对光均匀性的调节，也可以先执行对光照强度的调节，即既可以步骤S104-S106在前，而步骤S202-S204在后，也可以步骤S202-S204在前，而步骤S104-S106在后，此处不做具体限定。
通过上述方式，依据预设光照数据对光源120的第二光照数据进行调节，能够实现对光线透过选择性透光屏140后的光照情况进行把控，从而能够提高三维打印设备200的打印质量。
在一实施例中，第二光照数据和预设光照数据均包括光照强度，此时在依据第二光照数据与预设光照数据之间的关系调节恒流电流时，若在第二光照数据对应的第二光照强度未达到预设光照数据对应的预设光照强度时，则可增大恒流电流，以减小第二光照强度与预设光照强度之间的差值；当然在一些应用场景中，也可能会出现第二光照数据对应的第二光照强度超过预设光照数据对应的预设光照强度的情况，此时可减小恒流电流，以减小第二光照强度与预设光照强度之间的差值，或者也可以根据实际需求不进行调节。
需要说明的是，在一些应用场景中，上述的光源120控制方法中，对光均匀性的调节，以及对光照强度的调节，调节一次便能够达到要求，而在另一些应用场景中可能调节一次后未必能够达到要求，从而可能需要多次调节。
基于此，在一实施例中，在调节过程中，可以通过循环调节的方式多次接收多个第一光照数据和第二光照数据中的至少一者，也就是说，除了前述的步骤S104-S106和步骤S202-S204之外，再至少一次接收多个第一光照数据和第二光照数据中的至少一者，并且，在接收到多个第一光照数据后，依据多个LED灯组的多个第一光照数据之间的关系调节对应的LED灯组的驱动电流；在接收到第二光照数据后，依据第二光照数据与预设光照数据之间的关系调节恒流电流。
也就是说，前述的进行光均匀性调整的步骤和/或光照强度调节的 步骤均可根据需求执行多次，例如均需要执行2次、3次、4次等，当然，两个步骤的执行次数可以相同也可以不同，例如光均匀性调节执行1次，但是光照强度调节执行2次等，此处不做限定。另外，各步骤之间的先后顺序也不做限定。例如在光源120接通电源110的情况下，可以依次进行光均匀性调节、光照强度调节、光均匀性调节，也可以依次进行光照强度调节、光均匀性调节、光照强度调节，或者还可以光均匀性调节、光照强度调节、光均匀性调节、光照强度调节等，具体可根据实际调节情况进行选择，此处不做限定，只要能够使得最终光均匀性和光照强度都能够满足要求即可。
可以理解地，由于半导体的特性，光源120在发射光线的过程中会出现光衰的现象。因此，即便是进行了前述对光源120的调节，在工作一段时间后仍会出现光衰，而且对于不同的LED或COB芯片，因制作工艺、批次不同，可能出现光衰的情况也不同。基于此，请参阅图12，在一实施例中，光源120控制方法还可包括：
S302，获取多个LED灯组的光衰数据。
其中，这里的光衰数据可以采用前述的多个第一光照数据和第二光照数据的获取方法进行获取，具体可使用光检测机构160获取多个LED灯组的光照数据，然后可进一步将所获取的光照数据与先前所调整的光照数据，或者预设光照数据进行对比的得出光衰数据。
具体地，光衰数据可以是当前所检测到的光照强度与先前所调整的光照强度或者预设光照强度之间的差值。
S304，依据光衰数据调节恒流电流和对应的LED灯组的驱动电流中的至少一者，以使多个LED灯组的多个第一光照数据一致和/或第二光照数据与预设光照数据一致。
具体地，在获取到多个LED灯组的光衰数据之后，可以判断出光源120是整体出现光衰，还是局部光衰，即所有的LED灯组均出现光衰，还是仅部分LED灯组出现光衰。如果是光源120整体出现光衰的情况，则可调节所有LED灯组的恒流电流以进行整体补偿，从而提高光源120的第二光照强度。如果仅部分出现光衰情况，则可独立调节出 现光衰的LED灯组的驱动电流以进行独立、精准地补偿，从而提高单个LED灯组或者单个LED的光照强度，以提高光均匀性。
另外，本实施例中，在对LED灯组的电流进行调节以进行补偿时，可以通过手动的方式进行调节，也可以在控制机构150的控制下自动进行调节，具体调节方式可参照前述实施例，此处不再赘述。
需要说明的是，在对光源120进行光衰补偿的步骤可以在三维打印设备200进行3D打印工作的过程中进行，也可以在开始3D打印工作之前进行，此处不做限定。
通过上述方式，针对LED的半导体特性可对LED的光衰进行补偿，从而根据情况进一步调节光均匀性，或者整体的光照强度，以提高三维打印设备200的打印质量和打印效果。
需要说明的是，在上述各实施例的对光源120进行控制的方法中，控制机构150可通过PID环路，或者使用PID双环控制方法进行控制，获得所需的光照强度以及光均匀性，以及进行对LED的恒流电流或驱动电流的控制。而且对LED的独立电流的控制可包括但不限于直流电流控制、PWM电流控制、数字电流控制、分立元器件电流控制等。
另外，在一个应用例中，可通过以下方法对三维打印设备200的光源120进行控制：1、通过控制软件设定需要的光照强度值，并依据该光照强度值控制向光源120供电；2、打开LCD，使得LCD处于全通过状态；3、对每个LED或者每个LED灯组的光照强度进行采样，并且计算出光均匀性的差别；4、根据所确定的光均匀性差别，通过独立且精确电流控制调节对应LED或者LED灯组的驱动电流，使得LCD打印区域内的光均匀性达到要求；5、检测目前的光照强度与实际需要光照强度的差值；6、通过通信控制接口，调整对光源120提供的恒流源的电流，达到所需要的光照强度值；7、再对每个LED或者每个LED灯组的光照强度进行采样，并且计算出光均匀性的差别；8、根据所确定的光均匀性差别，通过独立且精确电流控制调节对应LED或者LED灯组的驱动电流，使得LCD打印区域内的光均匀性达到要求。
进一步地，在按照前述各实施例中的方法对光源120进行调节完成 后，可基于该调节结构进行3D打印。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。
对于本领域技术人员而言，显然本申请不限于上述示范性实施例的细节，而且在不背离本申请的精神或基本特征的情况下，能够以其它的具体形式实现本申请。因此，无论从哪一点来看，均应将实施例看作是示范性的，而且是非限制性的，本申请的范围由所附权利要求而不是上述说明限定，因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本申请内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
工业实用性
本申请实施例提供的方案可应用于光源控制技术领域，在本申请实施例中，采用包括选择性透光屏的三维打印设备，通过向三维打印设备中的光源包括的多个LED灯组提供驱动电流；接收多个LED灯组发出的光线透过选择性透光屏后的多个第一光照数据；依据多个第一光照数据之间的关系调节多个LED灯组的驱动电流，以使多个LED灯组的多个第一光照数据一致。本申请能够根据各LED灯组的第一光照强度数据通过电流调节机构等方式对每个LED灯组的驱动电流进行精准、独立地调节，从而实现对单个LED，或者一个区域的LED的独立且精准的控制，进而通过反馈的方式使得LED灯组的第一光照数据一致，使得其出光一致性更好，调节的独立性、准确度更高，从而实现提高光源在投影面的光均匀性的技术效果；另一方面，通过这种方式对光均匀性进行调节，与相关技术当中通过选择性透光屏本身实现匀光的方式相比，无需或仅需少量利用选择性透光屏中的像素点吸收光源所发出的紫外光，从而在一定程度上能够大大延长选择性透光屏中的粘合胶的老化时间，从而实现延长选择性透光屏的使用寿命的技术效果；再一方面，与相关技术相比，本申请无需通过选择性透光屏吸收UV光来进行匀 光，从而能够在一定程度上提高选择性透光屏的光通量，进而实现提高选择性透光屏的透光率，改善三维打印设备的打印质量的技术效果。

Claims (15)

  1. 一种三维打印设备的光源控制方法，所述三维打印设备包括选择性透光屏，所述光源包括多个LED灯组，所述光源控制方法包括：
    向所述多个LED灯组提供驱动电流；
    接收所述多个LED灯组发出的光线透过所述选择性透光屏后的多个第一光照数据；
    依据所述多个第一光照数据之间的关系调节所述多个LED灯组的所述驱动电流，以使所述多个LED灯组的所述多个第一光照数据一致。
  2. 如权利要求1所述的光源控制方法，其中，所述多个第一光照数据包括多个第一光照强度，依据所述多个第一光照数据之间的关系调节所述多个LED灯组的所述驱动电流，以使所述多个LED灯组的所述多个第一光照数据一致的步骤，包括：
    在所述多个第一光照数据包括的所述多个第一光照强度中的至少部分不相等时，调大所述多个第一光照强度中第一光照强度较小的LED灯组的驱动电流，和/或调小所述多个第一光照强度中第一光照强度较大的LED灯组的驱动电流，以减小所述多个第一光照强度之间的差值。
  3. 如权利要求1所述的光源控制方法，其中，向所述多个LED灯组提供驱动电流的步骤包括：向所述多个LED灯组提供恒流电流；所述光源控制方法还包括：
    接收所述多个LED灯组发出的光线透过所述选择性透光屏后的第二光照数据；
    依据所述第二光照数据与预设光照数据之间的关系调节所述恒流电流，以使所述第二光照数据与所述预设光照数据一致。
  4. 如权利要求3所述的光源控制方法，其中，所述第二光照数据包括第二光照强度，所述预设光照数据包括预设光照强度，依据所述第二光照数据与预设光照数据之间的关系调节所述恒流电流，以使所述第二光照数据与所述预设光照数据一致的步骤，包括：
    在所述第二光照数据包括的所述第二光照强度未达到所述预设光照数据包括的所述预设光照强度时，增大所述恒流电流，以减小所述第 二光照强度与所述预设光照强度之间的差值。
  5. 如权利要求3或4所述的光源控制方法，其中，还包括：
    至少一次接收所述多个第一光照数据和所述第二光照数据中的至少一者；
    在接收到所述多个第一光照数据后，依据所述多个LED灯组的所述多个第一光照数据之间的关系调节所述多个LED灯组的所述驱动电流；
    在接收到所述第二光照数据后，依据所述第二光照数据与所述预设光照数据之间的关系调节所述恒流电流。
  6. 如权利要求3或4所述的光源控制方法，其中，还包括：
    获取所述多个LED灯组的光衰数据；
    依据所述光衰数据调节所述恒流电流和所述驱动电流中的至少一者，以使所述多个LED灯组的所述多个第一光照数据一致和/或所述第二光照数据与所述预设光照数据一致。
  7. 如权利要求1所述的光源控制方法，其中，所述多个LED灯组中的每个LED灯组包括多个LED，或所述多个LED灯组中的每个LED灯组包括一个LED。
  8. 一种光源控制装置，应用于三维打印设备，所述光源控制装置包括：
    选择性透光屏，设置为选择性透光；
    光源，包括多个LED灯组，其中，所述多个LED灯组设置为向所述选择性透光屏投射光线；
    电源，与所述光源电连接，设置为向所述多个LED灯组提供驱动电流；
    电流调节机构，与所述多个LED灯组中的每个LED灯组电连接，设置为依据所述多个LED灯组的多个第一光照数据之间的关系调节对应的所述LED灯组的所述驱动电流，以使所述多个LED灯组的所述多个第一光照数据一致；
    其中，所述多个第一光照数据为所述多个LED灯组所投射的光线 透过所述选择性透光屏后的光照数据。
  9. 如权利要求8所述的光源控制装置，其中，还包括光检测机构，所述光检测机构设置为检测所述多个LED灯组投射的光线透过所述选择性透光屏后的所述多个第一光照数据。
  10. 如权利要求9所述的光源控制装置，其中，所述光检测机构包括光敏电阻、光电二极管、光电传感器、光度计、积分球、摄像头中的至少一种。
  11. 如权利要求8所述的光源控制装置，其中，所述多个LED灯组中的每个LED灯组包括多个LED，或所述多个LED灯组中的每个LED灯组包括一个LED。
  12. 如权利要求8所述的光源控制装置，其中，所述电源为恒流源，并设置为向所述多个LED灯组提供恒流电流。
  13. 如权利要求8所述的光源控制装置，其中，在所述光源控制装置包括多个电源的情况下，所述多个电源的数量与所述多个LED灯组的数量相同，所述多个电源与所述多个LED灯组一一对应电连接。
  14. 如权利要求13所述的光源控制装置，其中，所述光源为COB光源，所述多个LED灯组中的每个LED灯组包括一个COB芯片。
  15. 一种三维打印设备，包括料盘、成型平台及如权利要求8-14中任一项所述的光源控制装置，所述料盘设置为盛放打印材料，所述打印材料设置为在所述光源的照射下逐层形成在所述成型平台上以得到打印件。
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