KR20110092006A - Method and apparatus for test of led brightness by illumination sensor - Google Patents

Abstract

PURPOSE: An LED brightness test apparatus and method using an illuminance sensor are provided to change the brightness of an LED into an electric signal through the illuminance sensor and thereby reliably determine the normality of the LED brightness. CONSTITUTION: An LED brightness test apparatus using an illuminance sensor comprises a measuring device(100), a Mux circuit(200), a resistance meter(300), and a computer(400). The measuring device is embedded with an LED module(700) including a plurality of LEDs and measures the brightness of each LED of the LED module. The Mux circuit scans the resistance output of the measured LED brightness. The resistance meter measures the resistance of each LED. The computer is previously inputted with a conductance range in which the LED brightness is normal, changes the measured resistance into the conductance value, and compares the conductance value with a value in the normal conductance range to determine pass or fault.

Description

LED brightness test device and method using illumination sensor {Method and apparatus for test of LED brightness by illumination sensor}

The present invention relates to an LED brightness test apparatus and an inspection method using an illuminance sensor, and more particularly, LED brightness test apparatus and test using an illuminance sensor for checking whether the brightness of the light generated from each LED provided in the LED module is normal. It is about a method.

LED (Light Emitting Diode) is a semiconductor device that emits light when a voltage is applied in the forward direction.The principle of light emission uses electroluminescent effect, and the color of light is different depending on the material used. Can be.

The technology using the LED is currently used in many fields, such as lighting devices in each field, signboards for advertisements, traffic signal devices and home appliances such as televisions, and the produced LED module is used to determine the pass or fail of each LED brightness. As shown in Fig. 1, a luminance test method using a camera and a visual judgment test method using the naked eye are used.

In the method of inspecting brightness by the camera, as shown in FIG. 1A, 5 to 6 LED images are inspected by one camera at a time, and the LED brightness is determined by comparing the camera image with the reference image.

The visual inspection method is a method in which the operator visually inspects a state in which a worker opens or closes a low current cover on the LED module as shown in FIG.

However, the inspection method using the camera image as described above is expensive because the inspection apparatus is expensive, the visual inspection method is not excellent discrimination because the inspection is made by the operator, when changing the inspection specification (Spec) There is a problem that is not easy to respond.

In order to solve the problems described above, in the present invention, the discrimination power can be improved because the LED brightness is changed to an electrical signal using the illuminance sensor, and the discrimination power can be improved. It is an object of the present invention to provide an LED brightness inspection apparatus and inspection method using an illuminance sensor that can determine whether the LED brightness is normal at low cost.

As a configuration for achieving the purpose is equipped with a LED module is provided with a plurality of LED, measuring device for measuring the brightness of each LED provided in the LED module; A mux circuit unit which scans and reads the resistance output of each measured LED brightness; A resistance measuring meter for measuring each LED resistance value; A conductance value range in which the LED light brightness is normal is input in advance, and the computer converts the measured resistance value into conductance value and compares it with the value in the normal range to determine pass or fail.

A method for achieving the object may include a tenth step in which a conductance value range in which the LED light brightness is normal is input to an input terminal in a computer database; A twenty-stage step of applying power to the LED module mounted on the mounting jig so that each LED generates light, and the illuminance sensor provided on each LED measures light brightness; A thirtieth step of scanning a resistance output of each LED brightness measured by the Mux circuit part electrically connected to the illuminance sensor; Measuring each LED resistance value in a resistance measurement meter, and then transmitting each LED resistance value to a database of a computer through communication; A step 50 for converting a resistance value transmitted from an illuminance converter into a conductance value when an input signal for each LED resistance value is generated to the database; And comparing the converted conductance value with a conductance value of a normal range stored in a database by a comparison analyzer to determine pass or failure for each LED included in the LED module and output the result as a computer screen or a sound. do.

As described above, the present invention can improve the discrimination power by determining the brightness of the LED by converting the LED into an electrical signal, and can easily cope with changes in the inspection specifications, and the LED brightness at a relatively low cost. There is an effect that can determine whether is normal.

1 is a reference diagram showing a conventional LED module inspection method.
2 is a schematic configuration diagram of an LED brightness test apparatus using an illuminance sensor according to the present invention;
Figure 3 is a perspective view of the LED brightness measuring device using the illuminance sensor according to the present invention.
Figure 4 is a front view of the LED brightness measuring device using an illumination sensor according to the present invention.
5 is a plan view of the LED brightness measuring device using an illuminance sensor according to the present invention.
Figure 6 is a side view of the LED brightness measuring device using an illuminance sensor in accordance with the present invention.
Figure 7 is a view showing the internal configuration of the transfer plate and the ball screw in accordance with the present invention.
8 is a view showing a vertical transfer state of the transfer plate according to the present invention.
9 is a flow chart of the LED brightness test method using an illuminance sensor according to the present invention.
10 is an embodiment of giving a serial number when measuring the brightness value of each LED using the illumination sensor according to the present invention.
11 is a reference diagram showing the brightness test results of the LED module using the illuminance sensor according to the present invention.

2 is a schematic configuration diagram of an LED brightness test apparatus using an illumination sensor according to the present invention, FIG. 3 is a perspective view of an LED brightness measurement apparatus using an illumination sensor according to the present invention, and FIG. 4 is an illumination sensor according to the present invention. Figure 5 is a front view of the LED brightness measurement apparatus using, Figure 5 is a plan view of the LED brightness measurement apparatus using the illumination sensor according to the invention, Figure 6 is a side view of the LED brightness measurement apparatus using the illumination sensor according to the invention, Figure 7 Is a view showing the internal configuration of the transfer plate and the ball screw according to the invention, Figure 8 is a view showing a vertical transfer state of the transfer plate according to the present invention, Figure 9 is an LED brightness test using the illuminance sensor according to the present invention 10 is an embodiment of giving a serial number when measuring the brightness value of each LED using the illumination sensor according to the present invention, Figure 11 is an illumination intensity sensor according to the present invention This is a reference diagram showing the results of the brightness test of the LED module.

Hereinafter, the components will be described with reference to the drawings.

2 is a schematic configuration diagram of an LED brightness test apparatus using an illuminance sensor of the present invention, a measuring device 100 for measuring the brightness of the LED module 700 and a Mux electrically connected to the measuring device 100. The circuit unit 200 and the resistance measurement meter 300, and the computer 400 is connected to the communication from the resistance measurement meter (300).

The illuminance sensor includes all sensors capable of determining the brightness of light, including a CDS and a photodiode.

The measuring device 100 is equipped with a LED module 700 is provided with a plurality of LED, to measure the brightness of each LED provided in the LED module 700, the Mux circuit unit 200 is measured each LED The resistance output of the brightness is scanned and read, the resistance measuring meter 300 measures each LED resistance value, and the computer 400 inputs a conductance value range in which the LED light brightness is normal is input in advance. The resultant resistance value is converted into a conductance value and compared with the value in the normal range to determine pass or fail.

3 to 6, the measuring device 100 includes a base plate 110 provided on a bottom surface and a left and right ends of the upper surface of the base plate 110 as shown in the perspective view, the front view, the top view, and the side view of FIGS. 3 to 6. The pillars 120 to be fixed and the guide grooves 131 are formed at both front and rear sides of the left and right ends of the pillars 120 in the vertical direction so that the LM guides 130 are fastened to the bolts B, respectively.

Both sides of the fixing plate 140 are fastened to the rear surface of the left and right end pillars 120, and a mounting panel 141 protrudes from one side of the rear center portion of the fixing plate 140 to protrude the mounting panel 141. The motor 150 is mounted on the surface, and the motor shaft 151 into which the bearing 152 is inserted protrudes from the motor 150.

In addition, the front surface of the fixing plate 140 is provided with a ball screw 160, the fixing block 161 is fastened to the upper portion of the front center of the fixing plate 140, the bolt (B), the outer peripheral surface on the fixing block 161 The ball screw 160 in which a spiral groove is formed in a predetermined section is inserted in the vertical direction, and the lower one side of the ball screw 160 is provided in the vertical direction is provided with an impact absorbing member 164 on the upper side, A spiral groove is formed so that the transfer block 163 is vertically conveyed by the rotation direction of the ball screw 160 is inserted, the bearing 162 is inserted into the ball screw 160 protruding to the upper end of the fixed block 161. do.

A driving belt 170 is provided at both ends of outer surfaces of the bearings 152 and 162 of the motor 150 and the ball screw 160 to fix the rotational force of the motor shaft 151 according to the driving of the motor 150. 161 is transferred to the ball screw 160 protruding upward to control the shanghai transport of the transfer block 163, the motor 150 may use a servo motor capable of forward or reverse control.

The conveying plate 163 is formed on the front of the conveying block 163 so that the conveying plate 180 is fastened to the upper and lower conveying parts, and guide members 181 are provided at the left and right rear surfaces, respectively, to guide grooves of the LM guide 130. The protrusion 181a is inserted into the 131, and the protrusion 181 inserted into the guide groove 131 of the LM guide 130 during the transfer of the transfer plate 180 which is linked to the shanghai of the transfer block 163. 181a) to facilitate the smooth transfer.

In addition, the lower surface of the transfer plate 180 is provided with a sensor fixing portion 182, the lower surface of the sensor fixing portion 182, the illumination sensor (measured to measure the brightness of each LED provided in the LED module 700) 185 is provided at regular intervals, and at the bottom of the sensor fixing part 182 in which the illumination sensor 185 is provided, as shown in the enlarged view of FIG. 4, each illumination sensor 185 is partitioned by a partition 183. When measuring the brightness, the light of the adjacent left and right LEDs are blocked, and the left and right partitions 183 on one side of the lower side of the illuminance sensor 185 are further provided with a transmittance adjusting cover 184, and if too bright LED light is generated, the brightness is reduced. Given.

At the bottom of the sensor fixing part 182 in which the illuminance sensor 185 is provided, a mounting jig 190 is fixed at both ends of the pillars 120 so that the LED module 700 is mounted.

The computer 400 includes a database 410 in which conductance values of a normal range and resistance values of the LEDs measured by the LED module 700 are stored, and the resistance values measured from the resistance measurement meter 300. The communication unit 420, the Mux control unit 430 driving the Mux circuit unit 200, the illuminance conversion unit 440 converting the transmitted resistance value into a conductance value, and the converted conductance value Comparing analysis unit 450 to determine the pass or failure by comparing the conductance value of the normal range stored in the database 410.

7 is a view illustrating an internal configuration of the transfer plate 180 of the measuring device 100 and an internal configuration of the measuring device 100 in a state in which the transfer plate 180 is removed, and FIG. 7 (a) illustrates an LM guide ( ∩-shaped guide member 181 is provided on the rear surface of the transfer plate 180 so as to be inserted into the guide groove 131 of the 130. As shown in the enlarged view, projections 181a are disposed at both ends of the guide member 181 in the vertical direction. It can be seen that it is formed, the fastening hole 186 is fastened to the bolt (B) to the transfer block 163 in the central portion of the transfer plate 180 is formed.

7 (b) is an internal configuration of the measuring device 100 in which the transfer plate 180 is removed, and a fastening hole 165 is formed at the front of the transfer block 163 to fasten the transfer plate 180. The outer circumferential surface of the ball screw 160 has a spiral groove formed in a predetermined section, so that the transfer block 163 is vertically transferred.

8 is a view showing a vertical transfer state of the transfer plate 180, Figure 8 (a) shows a state in which the transfer plate 180 is transferred to the top, Figure 8 (b) shows that the transfer plate 180 is lower Indicates the state transferred to.

The LED brightness test method using the illuminance sensor of the present invention configured as described above will be described with reference to FIG. 9.

In the database 410 of the computer 400, a conductance value range in which the LED light brightness is normal is input to the input terminal, and the conductance value range is a work condition such as a characteristic or brightness change of the LED module 700 to be tested. According to the input terminal (as a general input device, input means such as a mouse or a keyboard) can be easily modified (step S10).

After the LED module 700 is mounted on the mounting jig 190 in the state where the normal conductance value is set as described above, power is applied to the mounted LED module 700 so that each LED generates light. The illumination sensor 185 provided on the LED measures the light brightness (step S20).

At this time, the illuminance sensor 185 for measuring the light brightness of each LED is given a serial number from one end, as shown in Figure 10, whether the LED brightness input to the corresponding illuminance sensor 185 for each LED is passed or defective products For easy understanding, the serial number is assigned when setting the database 410 of the computer 400, for example, when inputting a working condition for testing the LED module 700 having 10 LEDs. A serial number of 01,02 ... 09,10 is input from one end of the illuminance sensor 185 and 01,02 from one end of the illuminance sensor 185 when inputting a working condition for testing 70 provided with 20 LEDs. ... Serial numbers up to 19,20 are entered.

In addition, in the step S20, the height can be adjusted between the illumination sensor 185 and the LED module 700 according to the brightness of the LED to be measured, the rotation direction of the ball screw 160 driven by the motor 150 The height of the transport plate 180 fixed to the transport block 163 to be transported up and down by interlocking with the transport block 163 is adjusted.

The Mux circuit unit 200 electrically connected to the illuminance sensor 185 scans and reads the resistance output of each measured LED brightness (step S30). The resistance value of the resistance output of each LED is measured by a resistance measurement meter ( After the measurement at 300, the LED resistance value is transmitted to the database 410 of the computer 400 by using communication (step S40).

When the input signal for each LED resistance value is generated to the database 410, the resistance value transmitted from the illuminance conversion unit 440 is converted into a conductance value, and the transmitted LED resistance value or the converted conductance value may be somewhat shaken. In this case, the average value is used or filtered (S50 step).

The converted conductance value is compared with the conductance value of the normal range stored in the database 410 in the comparison analysis unit 450 to determine the pass or failure for each LED provided in the LED module 700 to determine the computer 400 ) To output the screen or sound (step S60).

FIG. 11 is a reference diagram illustrating a brightness test result of an LED module using an illuminance sensor of the present invention. As shown in FIG. 11 (a), the normal range value of conductance used for acceptance determination is determined by the database 410 of the computer 400. In the state set in the), as shown in Fig. 11 (b) by measuring the illuminance of the LED located in the second serial number and the LED located in the fourth serial number to determine the pass or fail finally through the steps S30 to S60. One result is shown in Fig. 11 (a), the serial number 2 is passed because it has a conductance value located in the normal range, and the serial number 4 has a conductance value of a position that falls below the normal range, so the bad judgment is It can be seen that it is lowered.

Therefore, the present invention can improve the discrimination power by determining the LED brightness by converting the LED brightness into an electrical signal using an illuminance sensor, and can easily respond even if the inspection specification is changed, and whether the LED brightness is normal at a relatively low cost. Can be determined.

Although the present invention has been shown and described with respect to specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone who can afford it will know.

100: measuring device 110: base plate
120: pillar 130: LM guide
131: guide groove 140: fixed plate
141: mounting panel 150: motor
151: motor shaft 152: bearing
160: ball screw 161: fixed block
162: bearing 163: transfer block
164: shock absorbing member 165: fastening hole
170: driving belt 180: transfer plate
181: guide member 181a: protrusion
182: sensor fixing part 183: partition
184: Transmittance adjustment cover 185: Ambient light sensor
186: fastener 190: mounting jig
200: Mux circuit 300: resistance measurement meter
400: computer 410: database
420: communication unit 430: Mux control unit
440: roughness conversion unit 450: comparative analysis unit
700: LED module B: bolt

Claims (7)

In the LED brightness inspection device using an illuminance sensor,
A LED module 700 having a plurality of LEDs mounted thereon, the measuring device 100 measuring the brightness of each LED provided in the LED module 700;
A mux circuit unit 200 scanning and reading the resistance output of each measured LED brightness;
A resistance measurement meter (300) for measuring the resistance value of each LED;
A conductance value range in which the LED light brightness is normal is input in advance, and is configured as a computer 400 for converting the measured resistance value into conductance value and comparing with the value in the normal range to determine pass or failure. LED brightness inspection device using an illuminance sensor. The method of claim 1, wherein the measuring device 100
A base plate 110 provided on the bottom surface;
Pillars 120 vertically fixed to the left and right ends of the upper surface of the base plate 110;
LM guides (130) formed at both sides of the guide grooves (131) in the vertical direction on the front left and right ends (120) and fastened with bolts (B), respectively;
Both ends of the left and right ends of the pillars 120 are fastened to each other by bolts B, and the fixing plate 140 protrudes from one side of the rear center portion.
A motor 150 mounted on an upper surface of the mounting panel 141 and protruding from the motor shaft 151 into which a bearing 152 is inserted;
The fixed block 161 is fastened to the upper portion of the front center of the fixed plate 140 by a bolt (B), and is inserted in the vertical direction to the fixed block 161 and has a shock absorbing member 164 provided at the upper and lower conveyance. Ball screw 160 is inserted into the block 163, the bearing 162 is inserted into the upper projection of the fixed block 161;
A driving belt 170 fixed at both ends to outer peripheral surfaces of the bearings 152 and 162 of the motor 150 and the ball screw 160;
The transfer block 163 is fastened to the front by the bolt (B) is configured to be transported up and down, and each of the guide member 181 is provided on the rear left and right ends, the projection groove 131 of the LM guide 130 181a is inserted, and the lower surface of the sensor fixing portion 182 is provided, and the lower surface of the sensor fixing portion 182 has an illuminance sensor 185 for measuring the brightness of each LED provided in the LED module 700. A transfer plate 180 provided at regular intervals;
At the bottom of the sensor fixing part 182 provided with the illuminance sensor 185, an illuminance sensor comprising a mounting jig 190 fixed at both ends of the pillar 120 to mount the LED module 700 thereon. LED brightness tester. The method of claim 2,
The lower part of the sensor fixing part 182 provided with the illuminance sensor 185 is divided into partitions 183 for each illuminance sensor 185 to block light of adjacent left and right LEDs when measuring the brightness of the LED. The left and right partitions 183 of the lower side of the sensor 185 is further provided with a transmittance adjusting cover 184, LED brightness inspection device using the illumination sensor, characterized in that to reduce the brightness when too bright LED light is generated. The computer of claim 1, wherein the computer 400 is
A database 410 that stores conductance values in a normal range and resistance values for each LED measured by the LED module 700;
A communication unit 420 receiving the resistance value measured from the resistance measuring meter 300;
A Mux controller 430 for driving the Mux circuit unit 200;
An illuminance conversion unit 440 converting the transmitted resistance value into a conductance value;
LED brightness test device using the illumination sensor, characterized in that the comparison analysis unit 450 to determine the pass or fail by comparing the converted conductance value with the conductance value of the normal range stored in the database 410 . In the LED brightness inspection method using an illuminance sensor,
A tenth step (S10) in which a conductance value range in which LED light brightness is normal is input to an input terminal in a database 410 of the computer 400;
A 20th step of applying power to the LED module 700 mounted on the mounting jig 190 so that each LED generates light, and the illuminance sensor 185 provided on each LED measures light brightness (S20). )Wow;
A thirtieth step (S30) of scanning and reading out a resistance output of each LED brightness measured by the Mux circuit unit 200 electrically connected to the illumination sensor 185;
A 40th step (S40) of measuring each LED resistance value in a resistance measurement meter (300), and then transmitting each LED resistance value to a database (410) of the computer (400) using communication;
A step 50 of converting the resistance value transmitted from the illuminance conversion unit 440 into a conductance value when an input signal for each LED resistance value is generated to the database 410;
The converted conductance value is compared with the conductance value of the normal range stored in the database 410 in the comparison analysis unit 450 to determine the pass or failure for each LED provided in the LED module 700 to determine the computer 400 LED brightness test method using a light sensor, characterized in that it comprises a 60 step (S60) for outputting the screen or sound. 6. The method of claim 5,
The 20th step (S20) is the height adjustment between the illumination sensor 185 and the LED module 700 according to the degree of brightness of the LED to be measured up and down by the rotation direction of the ball screw 160 driven by the motor 150 LED brightness test method using the illumination sensor, characterized in that the height adjustment of the transport plate 180 fixed to the transport block 163 is transferred to the. 6. The method of claim 5,
The 50th step (S50) is an LED brightness test method using the illuminance sensor, characterized in that used as an average value or filtered if there is a slight vibration of the transmitted LED resistance value or the converted conductance value.

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