WO2020184695A1 - Système d'irradiation de lumière - Google Patents

Système d'irradiation de lumière Download PDF

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Publication number
WO2020184695A1
WO2020184695A1 PCT/JP2020/010974 JP2020010974W WO2020184695A1 WO 2020184695 A1 WO2020184695 A1 WO 2020184695A1 JP 2020010974 W JP2020010974 W JP 2020010974W WO 2020184695 A1 WO2020184695 A1 WO 2020184695A1
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WIPO (PCT)
Prior art keywords
light
leds
light irradiation
led
irradiation system
Prior art date
Application number
PCT/JP2020/010974
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English (en)
Japanese (ja)
Inventor
孚 出島
海老原　聡
Original Assignee
株式会社アイテックシステム
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2019047817A external-priority patent/JP7284363B2/ja
Priority claimed from JP2019047816A external-priority patent/JP7329816B2/ja
Priority claimed from JP2019047818A external-priority patent/JP7288274B2/ja
Application filed by 株式会社アイテックシステム filed Critical 株式会社アイテックシステム
Priority to CN202080035756.3A priority Critical patent/CN113892027B/zh
Publication of WO2020184695A1 publication Critical patent/WO2020184695A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V3/00—Globes; Bowls; Cover glasses
    • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • 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
    • H05B47/20—Responsive to malfunctions or to light source life; for protection

Definitions

  • the present invention relates to a light irradiation system.
  • a sensor detects the detection position of a sensor such as a line sensor camera in a product inspection in various manufacturing processes for manufacturing steel plates, flat glass, foods, bills, etc.
  • a line-shaped lighting device that illuminates in a line shape according to the angle of view of the above (see, for example, Patent Document 1).
  • a light irradiation device having a plurality of ultraviolet LEDs arranged on a flat surface for example, in various manufacturing processes for producing a film made of an ultraviolet curable plastic, ultraviolet rays are emitted to cure the plastic to form a film.
  • a planar light irradiation device for irradiating is known (see, for example, Patent Document 2).
  • this type of light irradiation device needs to uniformly irradiate the light irradiation position with strong light.
  • Hundreds or thousands of LEDs in the latter light irradiator are often arranged at a small pitch. Since the photocurable plastic is cured by the light from each LED, if a failure such as a short circuit or a decrease in brightness occurs in some LEDs, the quality of the product is deteriorated.
  • an illuminometer in the light irradiation direction of the light irradiation device and inspect that each LED is normally lit before inspection or manufacturing. ..
  • the light irradiation device is often installed on an inspection line or a production line, and it is difficult to accurately perform an illuminance inspection using a illuminometer.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a light irradiation system capable of accurately detecting an LED failure.
  • the light irradiation system comprises a light irradiation device main body, a plurality of LEDs for curing the resin provided in the light irradiation device main body, and the LEDs.
  • a light irradiation system including a light amount sensor for detecting light and a control means for intermittently lighting the plurality of LEDs in order to cure a resin, wherein the control means can light the plurality of LEDs in an inspection mode. In the inspection mode, the control means turns on the plurality of LEDs for each group during the intermittent lighting extinguishing period, and is based on the comparison result between the detection value and the reference value of the light amount sensor at that time. The control means determines the LED failure.
  • the control means lights a plurality of LEDs for each group, the control means stores a reference value for each group, and a failure of each LED is determined using a smaller number of sensors than the group. .. It is also possible to provide sensors for each group. However, if sensors are provided for each group, the number of sensors increases, and it takes time and effort to check the detection accuracy of the sensors because the number of sensors is large. In particular, when the LED irradiates ultraviolet rays, there is a concern about early failure of the sensor.
  • the output value of the sensor decreases when there is a one-to-one relationship between the sensor and the group, not only is there a possibility that some of the LEDs in the group are defective, but the detection accuracy of the sensor may also be reduced. is there.
  • the number of sensors is smaller than the number of groups, one sensor is in charge of two or more groups. It is unlikely that LED failures will occur simultaneously in each of the two or more groups. Therefore, when the output value of the sensor for any of the two or more groups decreases, it means that the detection accuracy of the sensor does not decrease, but the LED of the group has a failure.
  • the light irradiation system of each of the above-described embodiments can accurately detect the failure of the LED.
  • LED failure can be detected accurately.
  • the LED light irradiation system for example, a predetermined area is irradiated with light in order to cure the photocurable resin.
  • a predetermined area is irradiated with light in order to cure the photocurable resin.
  • the light irradiation device 1, the power supply unit 2, the light irradiation device 1 and the power supply unit 2 are connected, and the power supply unit 2 is connected to the light irradiation device 1.
  • It has a connection cord 3 for supplying electric power.
  • the connection cord 3 supplies driving power to the light irradiation device 1.
  • the light irradiation device 1 has a plurality of substrates 10, and each substrate 10 has a plurality of LEDs 11 connected in series. Each LED 11 mainly emits ultraviolet rays.
  • a FET (field effect transistor) 12 as a transistor and a current detection resistor 13 are connected to each LED substrate 10 via a connection cord 3.
  • the drain terminal of the FET 12 is connected to the low potential end of a plurality of LEDs 11 (LED series circuit) connected in series, and the source terminal of the FET 12 is connected in series with the current detection resistor 13.
  • the FET 12 is connected to the low potential end side of the LED series circuit, but it is also possible to connect the FET 12 to the high potential end side of the LED series circuit. In this case, the source terminal of the FET 12 is connected to the high potential end side of the LED series circuit.
  • Each LED substrate 10 has a high potential side power supply unit 14a connected to the high potential end of the DC power supply device D of the power supply unit 2 via a connection cord 3 and a low potential side power supply unit 14b connected to the FET 12. And have.
  • the power supply unit 2 has one or more dimming boards 20, so that each dimming board 20 dims the plurality of LED boards 10 one by one. It is configured.
  • the dimming substrate 20 is provided in the power supply unit 2, but the dimming substrate 20 may be provided in the light irradiation device 1.
  • a dimming signal supply unit 30 for supplying a dimming signal to each dimming board 20 is provided in the power supply unit 2, and the dimming signal supply unit 30 sets the amount of current to be supplied to the plurality of LED boards 10. can do.
  • the dimming signal supply unit 30 transmits a dimming signal for each LED board 10 according to the information input by the operator to the input unit 40 of the power supply unit 2 to each dimming board 20.
  • Each dimming board 20 supplies the received dimming signal to the reference potential input unit 21b of each operational amplifier 21 via a D / A converter (not shown). That is, each dimming board 20 supplies a reference potential based on the dimming signal from the dimming signal supply unit 30 to the reference potential input unit 21b of the operational amplifier 21 corresponding to each LED board 10. Since it is configured in this way, the light irradiation position directly below the ends of the plurality of LEDs 11 arranged side by side and the light irradiation position directly below the center of the plurality of LEDs 11 arranged side by side have the same amount of light. Adjustment is possible. Further, even if the light amount of each LED 11 varies due to manufacturing factors or the like, it is possible to make adjustments to reduce the variation in the light amount at the light irradiation position.
  • the output terminal 21c of the operational amplifier 21 is connected to the gate terminal of the FET 12, and the comparative potential input unit 21a of the operational amplifier is connected between the source terminal of the corresponding FET 12 and the current detection resistor 13.
  • a well-known constant current circuit having an FET 12, a current detection resistor 13, and an operational amplifier 21 is configured.
  • the FET 12 causes the drive current from the DC current device D to flow through the connected LED series circuit.
  • the potential on the high potential side of the current detection resistor 13 changes according to the potential of the reference potential input unit 21b of the operational amplifier by this constant current circuit, the potential of the reference potential input unit 21b is changed to each LED 11. It is possible to control the flowing current (adjust the amount of light of each LED 11).
  • a constant voltage circuit may be used instead of the constant current circuit.
  • the power supply unit 2 of the present embodiment can light a plurality of LEDs 11 for each group. Specifically, in the present embodiment, the power supply unit 2 can light the LED 11 for each board 10.
  • Each LED substrate 10 is made of, for example, an aluminum plate, is provided on the light irradiation device main body 71, and is fixed so as to be in surface contact with a heat sink 72a extending along the substrate 10.
  • the lower heat sink 72b to which the heat sink 72a is fixed is fixed to the light irradiation device main body 71.
  • the light irradiation device main body 71 includes a lower body 71a to which the lower heat sink 2b is fixed, a plurality of side plates 71b having lower ends fixed to the ends of the lower body 71a, and the lower body 71a and the side plate 71b.
  • the cover 80 has a cover (transparent plate or transparent member) 80 that covers the upper end side of the space formed by.
  • the cover 80 is made of a translucent material such as acrylic plastic or glass.
  • the heat sink 72a and the lower heat sink 72b may be air-cooled, but the water-cooled type can be cooled regardless of the surrounding environment.
  • the light irradiation device 1 is provided with a sensor 90 capable of detecting the amount of light at the end of the cover 80.
  • a sensor 90 capable of detecting the amount of light at the end of the cover 80.
  • a light amount sensor such as a photodiode or a light amount meter capable of detecting the amount of light can be used.
  • the detection result of the sensor 90 is transmitted to the control device (control means) 100 of the power supply unit 2.
  • Sensors 90 which are smaller than the number of the substrates 10, are provided for the plurality of substrates 10.
  • two sensors 90 are provided for 12 substrates 10.
  • One of the two sensors 90 is arranged on one end side of the cover 80 and detects the light emitted from one end of the cover 80.
  • the other of the two sensors 90 is arranged on the other end side of the cover 80, and detects the light emitted from the other end of the cover 80.
  • the juxtaposed direction of the LEDs 11 between one end and the other end of the cover 80 may be referred to as the X direction
  • the direction may be referred to as the Y direction.
  • one surface of the cover 80 in the thickness direction is an incident surface 80a on which the light from the LED 11 is incident, and the other surface in the thickness direction is an exit surface 80b from which the light is emitted.
  • the cover 80 is provided with a plurality of reflecting portions 81.
  • Each reflecting portion 81 is, for example, a recess provided on the exit surface 80b.
  • the recess has four inclined surfaces. As shown in FIG. 5, two of the four inclined surfaces, 81a and 81b, are arranged in the X direction, and the other two inclined surfaces are arranged in the Y direction.
  • the recess has a pyramid shape.
  • the two inclined surfaces 81a and 81b arranged in the X direction are substantially triangular or triangular, respectively, and the two inclined surfaces arranged in the Y direction are also substantially triangular or triangular.
  • the two inclined surfaces 81a and 81b arranged in the X direction may be substantially trapezoidal or trapezoidal, respectively, and the two inclined surfaces arranged in the Y direction may be substantially trapezoidal or trapezoidal, respectively.
  • the angle ⁇ formed by the inclined surfaces 81a and 81b with the exit surface 80b is 30 °.
  • the angle ⁇ may be another angle as long as the functions described below are satisfied.
  • each reflection unit 81 corresponds to a plurality of LEDs 11.
  • each reflecting portion 81 is arranged at the center position of the four LEDs 11 when viewed from the direction of the optical axis LA of the LEDs 11.
  • three reflecting portions 81 are arranged with respect to the twelve LEDs 11 of one substrate 10 in a plan view.
  • the reflecting unit 81 may be arranged at the center position of the three LEDs 11, the center position of the two LEDs 11, the center position of the five LEDs 11, or the center position of the six LEDs 11.
  • the surfaces 81a and 81b reflect the light from the corresponding LED 11 in the X direction. That is, the surfaces 81a and 81b reflect the light from the corresponding LED 11 toward the sensor 90.
  • the angle obtained by adding the angle ⁇ to the angle ⁇ is equal to or greater than the critical angle of the material of the cover 80. If the refractive index of the material forming the cover 80 is about 1.5, the critical angle is about 42 °. In the present embodiment, since the angle ⁇ is 30 °, the light from the LED 11 forming an angle of 12 ° or more with the optical axis LA is totally reflected by the surfaces 81a and 81b. It does not necessarily have to be totally reflected. Even if the angle obtained by adding the angle ⁇ to the angle ⁇ is less than the critical angle of the material of the cover 80, a part of the light incident on the inclined surfaces 81a and 81b is reflected toward the sensor 90.
  • control device 100 is a computer having a processor 110, a storage unit 120, a RAM, and the like, an integrated circuit having the same function as the computer, and the like.
  • the storage unit 120 stores a lighting program 120a and a set of reference values 120b.
  • the lighting program 120a causes the set current to flow through each substrate 10.
  • the lighting program 120a causes a current set for each substrate 10 to flow, for example, as shown in the time chart shown in FIG.
  • the storage unit 120 stores a reference value 120b for each of the plurality of substrates 10.
  • the reference value 120b may be created based on the reference creation program 120c stored in the storage unit 120.
  • the processor 110 lights the LED 11 for each board 10 based on the reference creation program 120c, and sets the detection values of the two sensors 90 provided corresponding to the turned-on board 10 on the board to be detected.
  • the reference value 120b is stored in the storage unit 120.
  • the detected values of the two sensors 90 may be stored separately in the storage unit 120, or the average value, the added value, etc. of the detected values of the two sensors 90 may be stored in the storage unit 120.
  • the identification information of the substrate 10 may be the number of the substrate 10, the position information, or the like.
  • the detection values of all the sensors 90 when the LED 11 is turned on for each substrate 10 may be set as the reference value 120b.
  • the light irradiation device 1 or the power supply unit 2 may be provided with an operation unit such as a button 41 for starting reference setting.
  • the processor 110 may measure the reference value 120b and store it in the storage unit 120 according to the operation of the operation unit. Further, the processor 110 may measure the reference value 120b and store it in the storage unit 120 in response to a predetermined signal from an external computer such as a tablet computer. Since the reference value 120b may change depending on the environment in which the light irradiation device 1 is arranged, the operation of the operation unit or the setting of the reference value 120b according to the signal from the computer is for accurate failure detection of the LED 11. It is advantageous to.
  • the processor 110 Based on the lighting program 120a, the processor 110 lights each LED 11 in the inspection mode while the plurality of substrates 10 are irradiating light, as shown in FIG. As shown in FIG. 6, the processor 110 turns on the LEDs 11 of the plurality of boards 10 in a predetermined lighting period L1, and then turns them off in a predetermined turning-off period L2. The processor 110 turns on and off the plurality of boards 10 at the same time.
  • the processor 110 lights up in the inspection mode based on the lighting program 120a while turning on and off the above.
  • the inspection mode is turned on during the extinguishing period L2. Further, in the inspection mode lighting, for example, as shown in FIG. 6, a plurality of substrates 10 are lit one by one.
  • the processor 110 is No. 1 during the first turn-off period L2. Only the substrate 10 numbered 1 was turned on, and No. 1 was turned on during the second extinguishing period L2. Only the substrate 10 numbered 2 was turned on, and during the third extinguishing period L3, No. Only the substrate 10 numbered 3 is lit, and then the substrates 10 are lit one by one in the same manner.
  • the processor 110 lights a plurality of LEDs 11 for each group in the inspection mode.
  • the processor 110 may light a plurality of boards 10 such as two, three, and the like. Even in this case, it can be said that the processor 110 lights a plurality of LEDs 11 for each group.
  • the processor 110 compares the detection values of the two sensors 90 corresponding to the turned-on board 10 with the reference value 120b of the board 10, and based on the comparison result, of the board 10.
  • the failure of the LED 11 is determined.
  • the detection value of the two sensors 90 is, for example, 5% or more with respect to the reference value 120b. It becomes smaller. Therefore, the processor 110 can determine the failure of each board 10 by the comparison.
  • the reference value 120b for each substrate 10 is stored in the storage unit 120 in advance.
  • the detection value of the corresponding sensor 20 when each substrate 10 is turned on in the inspection mode may be stored in the storage unit 120 as the reference value 120b of each substrate 10.
  • the reference value 120b becomes more accurate.
  • lighting may be performed in the inspection mode by continuously lighting the target substrate 10 during the extinguishing period L2. Even in this case, it is possible to create the reference value 120b. Further, in this case, the amount of light emitted from the LED 11 in the inspection mode is stable even when the extinguishing period L2 is short.
  • the light extinguishing period L2 should be short.
  • the extinguishing period L2 may be several ⁇ s.
  • the extinguishing period L2 is preferably 1 msec or less. The technique of the present embodiment can also be applied when the extinguishing period L2 is 2 msec or more or 1 second or more.
  • lighting in the inspection mode as shown in FIG. 7 is advantageous for stabilizing the light irradiation amount of each LED 11 in the inspection mode.
  • a shutter 91 that blocks the exposed portion of the sensor 90 may be provided.
  • the shutter 91 for example, an electronic shutter such as a well-known focal plane shutter, a lens shutter, an electronic front curtain shutter, or a rolling shutter can be used.
  • the processor 110 controls the shutter 91 so that the shutter 91 is closed during the lighting period L1 and the shutter 91 is opened during the extinguishing period L2.
  • the processor 110 may open only the shutter 91 of the sensor 90 corresponding to the substrate 10 to be turned on in the inspection mode during the extinguishing period L2.
  • This configuration prevents deterioration of the sensor 90 due to the large amount of light from all the LEDs 11 being irradiated to the sensor 90 during the lighting period L1.
  • each LED 11 emits ultraviolet rays and each LED 11 is a high-intensity LED
  • deterioration of the sensor 90 is effectively prevented by the shutter 90.
  • the sensor 90 may be housed in a case 92 and the sensor 90 may be covered by a case 92 and a shutter 91. In this case, deterioration of the sensor 90 is more effectively prevented.
  • This LED light irradiation system uses a light irradiation device 4 that irradiates light in a line shape as shown in FIGS. 9 and 10 instead of the light irradiation device 1 that irradiates light in a planar shape of the first embodiment. Is.
  • This LED light irradiation system has the same power supply unit 2 and connection cord 3 as in the first embodiment.
  • the same reference numerals are given to the same configurations as those in the first embodiment, and the description thereof will be omitted.
  • the light irradiation device 4 has a plurality of substrates 10, and each substrate 10 has a plurality of LEDs 11 connected in series.
  • the connection between the power supply unit 2 and each substrate 10 is the same as in the first embodiment. Therefore, even in the second embodiment, the power supply unit 2 can light a plurality of LEDs 11 for each group, for example, for each substrate 10.
  • the light irradiation device 4 is provided with a sensor 90 capable of detecting the amount of light at the end of the cover 80, and the detection result of the sensor 90 is transmitted to the control device 100 of the power supply unit 2.
  • the number of sensors 90 is smaller than the number of substrates 10 for the plurality of substrates 10.
  • the light irradiation device 4 is provided with one sensor 90 at each end of the LEDs 11 in the parallel direction, and the light irradiation device 4 has three or more substrates 10.
  • Each sensor 90 detects the light emitted from the edge of the cover 80.
  • the parallel direction of the LEDs 11 may be referred to as the X direction
  • the extension direction of the cover 80 orthogonal to the X direction may be referred to as the Y direction.
  • the light irradiation device 4 is provided with a condenser lens 4a for condensing the light from the plurality of LEDs 11 in the Y direction.
  • the condenser lens 4a is made of transparent plastic, glass or the like, and is a linear Fresnel lens, a cylindrical lens, a cylindrical rod lens or the like.
  • a diffuser plate 4b for diffusing the light from the plurality of LEDs 11 may be provided. Light passes through the cover 80 after passing through the condenser lens 4a.
  • the diffuser plate 4b is made of transparent plastic, glass or the like. The condenser lens 4a and the diffuser plate 4b may not be provided.
  • a plurality of reflecting portions 81 similar to those in the first embodiment are provided on the exit surface 80b from which the light emitted from the LED 11 that has passed through the condenser lens 4a, the diffuser plate 4b, and the like is emitted, and the plurality of reflecting portions 81 are arranged in the X direction. I'm out. As shown in FIG. 10, each reflecting unit 81 reflects the light from the plurality of LEDs 11 in one or the other in the X direction in the cover 80 as in the first embodiment.
  • the storage unit 120 stores the reference value 120b for each of the plurality of substrates 10.
  • the processor 110 turns on the LED 11 of each substrate 10 in the lighting period L1 as shown in FIGS. 6 and 7, and turns off the LED 11 in the extinguishing period L2.
  • the processor 110 lights a plurality of substrates 10 one by one in the inspection mode during the extinguishing period L2, and the detection values of the two sensors 90 at that time are used as reference values of the substrate 10. Compare with 120b. Further, the processor 110 determines the failure of each substrate 10 based on the comparison result. In this way, in the second embodiment as well as in the first embodiment, it is possible to accurately determine the failure of each substrate 10 while using the light irradiation device 4.
  • the reflecting portion 81 may be arranged near the end portion of the cover 80 in the Y direction.
  • the failure determination of each substrate 10 is performed by using light other than the light collected in the Y direction by the condenser lens 4a and irradiated to the irradiation position.
  • the light diffusing units 82 and 83 which will be described later, can be arranged in the same manner.
  • the reflection unit 81 may be omitted. Even in this case, for example, when the cover 80 is a diffusion plate and the incident surface 80a of the cover 80 is provided with irregularities for diffusion, a part of the light from each LED is reflected by the emission surface 80b.
  • a part of the reflected light reaches the sensor 90.
  • the diffusion plate 4b can be omitted.
  • the light from the LED 11 may reach the sensor 90 at the end of the cover 80 by another method.
  • the sensor 90 may be provided at the end of the condenser lens (transparent member) 4a, and the sensor 90 may detect the light from the end of the condenser lens 4a.
  • the reflection unit 81 may be omitted, and each sensor 90 may be provided on the substrate 10.
  • the sensor 90 may be arranged at the center position of the four LEDs 11.
  • the number of sensors 90 is smaller than the number of substrates 10 for the plurality of 10 substrates 10.
  • the sensor 90 may be arranged at the center position of the three LEDs 11, the center position of the two LEDs 11, the center position of the five LEDs 11, or the center position of the six LEDs 11.
  • the storage unit 120 stores the reference value 120b for each of the plurality of substrates 10.
  • the processor 110 turns on the LED 11 of each board 10 in the lighting period L1 as shown in FIGS. 6, 7 and the like, and turns off in the extinguishing period L2. Further, as in the first embodiment, the processor 110 lights a plurality of substrates 10 one by one in the inspection mode during the extinguishing period L2, and sets the detection values of the corresponding three sensors 90 on the substrate 10 at that time. Compare with reference value 120b. Therefore, as in the first and second embodiments, it is possible to accurately determine the failure of the LED 11 of each substrate 10 during the use of the light irradiation device 1.
  • each reflecting portion 81 has a pyramid shape, but each reflecting portion 81 may have a dome shape. Each reflecting portion 81 may have another shape as long as it reflects a part of the light from the corresponding LED 11 toward the sensor 90.
  • the senor 90 can be provided at another location in the light irradiation devices 1 and 4.
  • the sensor 90 can be provided outside the light irradiation devices 1 and 4. Even in these cases, if the reference value 120b of each substrate 10 is stored in the storage unit 120, the detection value of the sensor 90 and the reference value 120b are compared with each substrate when the each substrate 10 in the inspection mode is lit. It is possible to accurately determine the failure of the LED 11 of 10.
  • the sensor 90 When the sensor 90 is provided outside the light irradiation devices 1 and 4, the sensor 90 is arranged inside the resin curing device. More specifically, the sensor 90 is arranged in the resin curing chamber of the resin curing device.
  • the resin curing chamber is a chamber for preventing ultraviolet rays from the light irradiation devices 1 and 4 from unnecessarily leaking to the outside of the resin curing device.
  • the light irradiation devices 1 and 4 may not be provided with 80.
  • the light from each substrate 10 in the inspection mode is reflected by at least one of the wall surface in the resin curing chamber, the conveyor, and the body of the light irradiation devices 1 and 4, and the reflected light is detected by the sensor 90.
  • the reference value 120b is also the detection value of the sensor 90 for the reflected light. Even in this case, since it is difficult for light from the outside to enter the resin curing chamber, accurate failure detection of the LED becomes possible.
  • the reference value 120b is stored in the storage unit 120 of the control device 100, and the detection value of the sensor 90 is transmitted to the control device 100.
  • the reference value 120b is stored in the storage unit of the other control device which is a computer, the detection value of the sensor 90 is transmitted to the other control device, and the other control device of each board 10 based on the reference value 120b.
  • the failure of the LED 11 may be determined.
  • the control device 100 and other control devices function as control means.
  • the light irradiation devices 1 and 4 cure the resin by intermittently lighting the plurality of LEDs 11 by the control device 100, and the control device 100 has the plurality of LEDs 11 during the intermittent lighting extinguishing period L2. Is lit for each group. Then, the control device 100 determines the LED failure based on the comparison result between the detection value of the sensor 90 and the reference value 120b.
  • the light irradiation devices 1 and 4 for curing the resin are often arranged deep in the process of curing the resin to manufacture a product. Further, since the step is for curing the resin efficiently and accurately, each LED 11 is not turned off while the resin to be cured is arranged at the light irradiation position.
  • the control device 100 lights a plurality of LEDs 11 for each group, the control device 100 stores a reference value 120b for each group, and each LED 11 uses a smaller number of sensors 90 than the group. Failure is determined. It is also possible to provide the sensor 90 for each group. However, if the sensors 90 are provided for each group, the number of sensors 90 increases, and checking the detection accuracy of the sensors 90 takes time and effort due to the large number of sensors 90. In particular, when the LED 11 irradiates ultraviolet rays, there is a concern that the sensor 90 may fail early.
  • the output value of the sensor 90 decreases when the sensor 90 and the group are one-to-one, not only there is a possibility that a part of the LED 11 of the group has a failure, but also the detection accuracy of the sensor 90 is reduced. There is a possibility.
  • the number of sensors 90 is smaller than the number of groups, one sensor 90 is in charge of two or more groups. It is unlikely that LED 11 failures will occur simultaneously in each of the two or more groups. Therefore, when the output value of the sensor 90 for any of the two or more groups decreases, it means that the detection accuracy of the sensor 90 does not decrease, but the LED 11 of the group has a failure. ..
  • the light irradiation system of each of the above-described embodiments can accurately detect the failure of the LED 11.
  • the senor 90 is arranged so as to detect light from the end portion of the transparent plate or the transparent member. Therefore, the sensor 90 does not reduce the amount of light for light irradiation of the light irradiation devices 1 and 4 in the future. Further, when the light irradiation devices 1 and 4 are irradiated with ultraviolet rays, the sensor 90 is not directly irradiated with the strong light in the irradiation range, so that the early failure of the sensor 90 is prevented.
  • the reflecting portion 81 is provided on the exit surface 80b of the cover 80, a part of the light from the LED 11 can be efficiently directed to the end portion of the cover 80. This is advantageous in accurately determining the failure of the LED 11 based on the detected value of the sensor 90.
  • the reflecting unit 81 is arranged at the center position of the plurality of LEDs 11 when viewed from the direction of the optical axis LA of the LED 11, and the influence of the light amount of each LED 11 on the detected value of the sensor 90 is substantially abbreviated. Equivalent. This is advantageous for accurately detecting the presence or absence of failure of each LED 11.
  • the sensor 90 may be mounted on the substrate 10 so as to be arranged at the center position of the plurality of LEDs 11 when viewed from the direction of the optical axis LA of the LED 11. Even in this case, the influence of the amount of light of each LED 11 on the detected value of the sensor 90 is substantially the same.
  • a single sensor 90 may be provided at the end of the cover (transparent plate) 90 or the condenser lens (transparent member) 4a instead of the plurality of sensors 90. Even in this case, the same effects as described above can be achieved.
  • a light diffusing unit 82 may be provided instead of the reflecting unit 81.
  • the light diffusing portion 82 is provided by forming unevenness of several tens to several hundreds of ⁇ m on a part of the exit surface 80b. The unevenness may be uniform or random.
  • the light diffusing portion 82 is provided by physically or chemically roughening the exit surface 80b.
  • the light diffusing unit 82 is provided instead of the reflecting unit 81, the light from the LED 11 is diffused in various directions by the light diffusing unit 82, and a part of the light is directed to the sensor 90. It can also be said that the light diffusing unit 82 is also a reflecting unit that reflects light toward the sensor 90.
  • a light diffusing unit 83 may be provided instead of the reflecting unit 81.
  • the light diffusing portion 83 is provided by attaching a sheet that diffuses light to a part of the incident surface 80a.
  • the light diffusing portion 83 may be provided by forming irregularities of several tens to several hundreds of ⁇ m on a part of the incident surface 80a. The unevenness may be uniform or random.
  • the light diffusing portion 82 is provided by physically or chemically roughening the exit surface 80b.
  • the light diffusing unit 82 or the light diffusing unit 83 is 3% or less of the total area of the cover 80 in the plan view of the cover 80. Even if the area of the light diffusing portion 82 or the light diffusing portion 83 is 5% or less of the total area of the cover 80, it can be established as long as the amount of light to be irradiated by the target is secured.
  • the light irradiation devices 1 and 4 may be used as lighting for the inspection device.
  • each LED 11 When performing an inspection using ultraviolet rays, each LED 11 mainly emits ultraviolet rays. Depending on the type of inspection, each LED 11 may emit visible light or infrared light.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne un système d'irradiation de lumière comprenant : une pluralité de DEL ; un capteur qui détecte la lumière provenant des DEL (11) ; et un moyen de commande permettant d'allumer par intermittence les DEL (11) afin de durcir une résine, le moyen de commande pouvant allumer les DEL (11) dans un mode d'inspection, et le moyen de commande allumant, en tant que mode d'inspection, les DEL (11) dans des groupes individuels pendant la période d'arrêt d'un éclairage intermittent afin de déterminer une défaillance dans l'une quelconque des DEL sur la base du résultat de la comparaison d'une valeur de référence (120b) et d'une valeur de sortie du capteur (90) à ce moment.
PCT/JP2020/010974 2019-03-14 2020-03-13 Système d'irradiation de lumière WO2020184695A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202080035756.3A CN113892027B (zh) 2019-03-14 2020-03-13 光照射系统

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2019047817A JP7284363B2 (ja) 2019-03-14 2019-03-14 照明システム
JP2019-047816 2019-03-14
JP2019-047818 2019-03-14
JP2019047816A JP7329816B2 (ja) 2019-03-14 2019-03-14 照明システム
JP2019047818A JP7288274B2 (ja) 2019-03-14 2019-03-14 光照射システム
JP2019-047817 2019-03-14

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WO2020184695A1 true WO2020184695A1 (fr) 2020-09-17

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WO (1) WO2020184695A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009262050A (ja) * 2008-04-24 2009-11-12 Panasonic Electric Works Co Ltd 紫外線照射装置
JP2017170616A (ja) * 2016-03-18 2017-09-28 Ｈｏｙａ Ｃａｎｄｅｏ Ｏｐｔｒｏｎｉｃｓ株式会社 光照射装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009262050A (ja) * 2008-04-24 2009-11-12 Panasonic Electric Works Co Ltd 紫外線照射装置
JP2017170616A (ja) * 2016-03-18 2017-09-28 Ｈｏｙａ Ｃａｎｄｅｏ Ｏｐｔｒｏｎｉｃｓ株式会社 光照射装置

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