KR20120078595A - An apparatus and a method for measuring automatically optical properties of a led module using a integrating sphere - Google Patents

Abstract

PURPOSE: A device and a method for automatically measuring optical properties of a LED module using an integration sphere are provided to automatically position a pre-assembled LED module within an integration sphere, thereby automatically measuring optical properties of the LED module. CONSTITUTION: A device for automatically measuring optical properties of a LED module comprises a transferring device(200), a shift device(300), an integration sphere(400), and a system controlling device(100). The transferring device automatically transfers a LED module. The shift device upwardly shifts the LED module transferred by the transferring device. The integration sphere comprises a LED module insertion jig and measures optical properties with respect to the LED module being inserted into the LED module insertion jig. The system controlling device controls a power supply for driving the transferring device and shift device.

Description

An apparatus and method for measuring automatically optical properties of a LED Module using a integrating sphere}

The present invention relates to a technique for measuring optical characteristics of an LED module using an integrating sphere, and more particularly, an LED module (PCB: circuit board) pre-assembled in an integrating sphere of the type recommended by CIE is automatically integrated into the integrating sphere. The present invention relates to an invention for automatically measuring optical properties such as total light speed, color temperature, spectrum, CRI, and uniformity.

In general, a method of evaluating the performance of a light should measure the total luminous flux from the light, which is the measure of the total amount of light emitted by any light source in all directions. Today's mining industry is constantly changing by creating new light source technologies. Traditional incandescent and discharge lamps are being replaced by light emitting diodes (LEDs) and organic light emitting diodes (OLEDs). Most of these light sources have a narrow wavelength band in the emission spectrum and are designed using a matrix of LEDs to increase the luminous flux. Circuit boards designed and assembled with LED Matrix are called PCBs or LED modules.

However, the conventional method for measuring the total luminous flux of the LED lighting is a method of assembling the LED module in the form of a luminaire, and after the person directly set in the center of the integrating sphere (measuring). In addition, since this method takes a long time, it uses a sampling method rather than a whole measurement. Therefore, according to this measuring method, process defects (assembly) and raw material defects (LED optical characteristics, electrical characteristics, etc.) cannot be detected in advance before the finished product, and the defects are detected in the finished product form, resulting in huge production loss. Will result.

As a result, LED lighting companies focused their efforts on improving process quality and import inspection quality to improve quality while reducing losses due to defects in the form of finished products. Use the method of doing it. For example, the total inspection method uses a method of calculating the total luminous flux and the average color temperature by measuring individual LED luminous fluxes or colors and adding the measured values, and a method of measuring each LED module. As described above, since the measurement method of the LED module unit is measured in the form of a luminaire which is a finished product, it is not possible to prevent in advance process defects and raw material defects that may occur during production. Therefore, there is a problem in the generation and quality control, and the individual LED luminous flux measurement method is also difficult to apply because the measurement error occurs for the following reasons.

The individual LED total luminous flux measurement method is as follows.

1. Measure the absorption of the LED under test. Only the auxiliary bulb is turned on without the LED in the integrating sphere, and after the auxiliary bulb is stabilized, measure the relative spectral radiant flux or total luminous flux by the number of measurements set by the spectroradiometer. Find the mean and sample standard deviation.

2. Open the integrating sphere and insert the LED into the measuring socket or fixture. It is recommended to work with experimental poly-gloves rather than with bare hands to avoid contamination of the LED surface. Insert the LED into the socket, turn it on for a while, and carefully observe the appearance of the LED to see if there is any foreign matter.If the foreign matter is stuck, wipe it gently with a soft cloth or tissue and turn off the LED again.

3. Measure the relative total spectral radiant flux or total luminous flux by the number of measurement set by the spectroradiometer without turning on the LED under test. Find the mean and sample standard deviation. Calculate the absorbance by taking the ratio with the value obtained in 1. After that, the auxiliary light goes out.

4. Apply a forward bias current setpoint to the LED and wait for 3 to 5 minutes.

5. Measure the total luminous flux and junction voltage more than 10 times and record the average of each data sheet. When measuring junction voltage, it is recommended to measure by 4-wire method to minimize the effect of stray resistance. The total luminous flux value corrected is calculated from the absorption rate obtained in step 3.

6. Disconnect power to the LED and remove it from the socket or holder.

However, as described above, in the case of using the method of calculating the total luminous flux and the average color temperature by measuring individual LED luminous fluxes or colors and adding the measured values for the whole inspection, the optical characteristics are measured in units of LED modules. The problem occurs when the error exceeds the limit range. This is because the LED module is composed of matrix and does not take into account the interference generated between each LED, resulting in errors in total light speed and other optical characteristics. Therefore, it is difficult to apply both the above-mentioned method to mass production and the total inspection method.

The problem to be solved by the present invention is to automatically transfer the LED module through the transfer device, to be automatically inserted into the lower portion of the integrating sphere, using a shift device, after measuring the optical properties automatically, the LED light characteristics measured An apparatus and method for automatically measuring optical characteristics of an LED module using an integrating sphere for automatically transferring a module.

In order to solve the above problems, the optical characteristic automatic measuring device of the LED module using the integrating sphere according to the present invention comprises a transfer device for automatically transferring a plurality of LED or LED module is assembled; A shift device for lifting up the LED module transferred from the transport device; And an LED module insertion jig having a predetermined lower portion of the LED module inserted into the integrating sphere so that the LED module lifted by the shift device can be inserted into the integrating sphere. Integrating sphere to measure; And a system controller for controlling a power supply for driving the transfer apparatus and the shift apparatus.

Preferably, the transfer device is provided with a conveyor belt for transferring the LED module to the shift device, the system controller is characterized in that for controlling the power supply to the motor for driving the conveyor belt. .

Preferably, the system controller is characterized in that for controlling the power supply to the motor to transfer the LED module measured the optical characteristics in the integrating sphere to the position for the next process using the conveyor belt.

Preferably, the transfer apparatus transfers the transfer jig equipped with the LED module to the shift apparatus by using a transfer jig which can be separately mounted according to the model type of the LED module. It is characterized by lifting the transfer jig.

Preferably, the shift device is provided with a shift jig for adjusting the alignment so that the LED module can be inserted into the LED module insertion jig, characterized in that for lifting the shift jig.

Preferably, the shift jig, the stopper block for stopping the LED module conveyed from the transfer device in the shift device; Jig alignment pins for adjusting the alignment of the LED module insertion jig and the shift jig itself; And an LED module alignment pin for adjusting the alignment of the LED module.

Preferably, the stopper block is provided with a detection sensor for detecting that the LED module is approaching and leaving the shift device, the system control device according to the detection result of the detection sensor, the transfer device and the It is characterized by controlling the power supply of the shift device.

Preferably, the LED module insertion jig is characterized in that it is sealed in all areas other than the area in which the LED module is inserted.

Preferably, the LED module insertion jig, characterized in that can be replaced by distinguishing each according to the model type of the LED module.

Preferably, the LED module insertion jig, characterized in that it comprises a pin block, a probe pin and a connecting printed circuit board for directly supplying power to the pattern of the LED module for measuring optical characteristics.

Preferably, the optical characteristic automatic measuring device of the LED module using the integrating sphere further comprises a power supply for supplying power to the LED module for measuring the optical characteristics for the LED module inserted into the integrating sphere. Characterized in that.

In order to solve the above problems, a method for automatically measuring optical characteristics of an LED module using an integrating sphere according to the present invention includes the steps of automatically transferring a LED module having a plurality of LEDs or LED packages assembled thereon to a shifting device; Lifting, by the shift device, the LED module transferred from the transfer device; Optical characteristics of the LED module inserted in the LED module insertion jig in the integrating sphere having an LED module insertion jig having a predetermined lower portion hollow so that the LED module lifted by the shift device can be inserted Measuring; The shifting device descending the LED module in which the optical characteristic is measured; And transferring the lowered LED module to a position for a next process.

Preferably, the step of lifting up the LED module conveyed from the transfer device, adjusting the alignment so that the LED module can be inserted into the LED module insertion jig, and after the alignment of the alignment, the LED module It is characterized by lifting.

Preferably, lifting up the LED module transferred from the transfer apparatus stops the LED module transferred from the transfer apparatus to the shift jig of the shift apparatus and the shift jig in which the LED module is stopped. And after adjusting the alignment of the LED module insertion jig, and after adjusting the alignment of the LED module, it is characterized in that the lifting up the LED module.

According to the present invention, by automatically placing the pre-assembled LED module in the integrating sphere to automatically measure the optical characteristics such as total light speed, color temperature, Spectrum, CRI, uniformity, contributes to the quality of the module as a whole inspection and mass production equipment In addition, by allowing the LED module having the optical characteristic measured to be automatically transferred to the device for the next process, the user's convenience is increased.

In addition, the LED module equipped with a large number of LEDs can be automatically measured, enabling a full inspection of the LEDs in a short time.

In addition, by quickly determining whether each LED module is defective, it is possible to optimally maintain the quality of the product using the LED module.

Figure 1 shows the general structure of a conventional integrating sphere for measuring the total luminous flux.
2 is a block diagram illustrating an automatic optical characteristic measuring apparatus of an LED module using an integrating sphere according to the present invention.
3 is a view showing the overall appearance of the automatic measurement device for optical characteristics of the LED module using the integrating sphere according to the present invention.
4 is a reference diagram showing the structure of the transfer apparatus.
5 is a reference diagram illustrating an example of a conveying jig conveyed by a conveying apparatus.
6 is a reference diagram showing the structure of a shift device.
7 is a reference diagram illustrating specific components of the shift jig 310.
8 is a reference diagram illustrating a process in which a shift device lifts an LED module into an integrating sphere.
9 is a reference diagram illustrating an example of a connector for inserting an LED module and supplying power.
10 is a reference view showing an integrating sphere close contact jig forming a lower portion of an integrating sphere for mounting an LED module insertion jig.
11 is a reference diagram illustrating another LED module insertion jig that may be replaced according to the model type of the LED module.
12 is a reference diagram for explaining that the total luminous flux is measured by inserting the LED module into the integrating sphere.
13 is a flowchart illustrating a method for automatically measuring optical characteristics of an LED module using an integrating sphere according to the present invention.

Recently, LED has exceeded 120 [lm / W], which is the lighting efficiency of fluorescent lamps. Thanks to the continuous increase in efficiency, efforts are being made to replace existing lighting with LEDs at home and abroad. For this reason, evaluating LED lighting performance has become a challenge, and the measurement of light intensity and radiance of LEDs is being made at production, development, and research sites. However, LEDs are difficult to accurately measure optical characteristics due to various characteristics different from existing light sources. In order to solve this problem, the International Lighting Commission has made or is encouraging some recommendations, and the Korea Research Institute of Standards and Science, a national standards organization, intends to provide guidelines for accurate LED measurement through related studies.

In the following, the general content of the Commission Internationale de l'clairage Recommendation CIE127: 2007, "Measurement of LEDs," relating to LED measurement, is first introduced.

1. Electrical and Optical Characteristics of LEDs

The photoluminescence mechanism of the LED causes electron-hole recombination by the current injected into the pn junction, resulting in photon emission corresponding to band-gap energy. It can be explained. In semiconductor devices, the electrical conductivity changes with temperature, and the recombination rate and band gap energy causing light emission also change. For this reason, the electrical and optical properties of LEDs tend to be highly dependent on temperature.

Usually, the LED is turned on in three ways: constant-current, constant-voltage, and constant-power. It is recommended to turn on the constant-current supply. As mentioned earlier for LED light-emitting mechanisms, because photon emission depends on the injection current, the constant-current method makes it possible to obtain the most stable light output. However, even if it operates in the constant-current mode, when the temperature of the measurement chamber changes due to the temperature dependence of the LED, the temperature of the LED junction is also changed, and even though the same current is supplied, there is a difference in light output. Therefore, in order to obtain satisfactory reproducibility and consistency, not only the injection current but also the environmental temperature of the measuring room should be the same. It is recommended to record the temperature and environmental conditions of the measuring room together when measuring the LED optical characteristics. In addition, it is good to measure the voltage across the LED junction during constant-current operation. The LED junction junction is a sensitive function of the junction temperature, so recording the junction voltage alone will include information about the junction temperature. At this time, the junction voltage should be measured by 4-wire connection to avoid additional voltage drop due to stray resistance or contact resistance.

On the other hand, the junction temperature of the LED is affected not only by the measurement room environmental temperature but also by ohmic heating caused by the finite resistance of the LED junction. The ohmic calorific value can be estimated by the approximate electrical output supplied to the LED. Of course, if the operating current is large, the junction temperature will have a higher value. In the case of LED lamps, it is composed of various structures such as chip die, cup, terminal wire, epoxy molding, etc. It takes considerable time to equilibrate. Therefore, preheating time of 3 to 5 [minutes] should be allowed before actual light measurement. Otherwise, the light output characteristics of the LED will change during the measurement.

The light emission characteristics of LED can be classified into spectral characteristics and light distribution characteristics according to the angle of light intensity. First, the spectral characteristics, in the case of a monochromatic LED, the full width at half maximum of the spectral power distribution is about 10 to 50 [nm], so that the line width is very narrow compared to the existing incandescent light source. Also, characteristic wavelengths, such as centroid wavelength, vary with junction temperature. As such, due to the spectral characteristics of the narrow line width of the LED, the spectral responsivity error of the instrument confined to a specific region is reflected in the measured average LED intensity and total luminous flux, and thus a relatively high error. Will be generated. In fact, if the half width is large, such as an incandescent light source, even if the measuring instrument has a spectral sensitivity error in some areas, it has the effect of taking an average over the entire spectral area and hardly generates an error.

On the other hand, a white LED is usually made by applying a yellow phosphor (eg YAG: Ce powder) to a blue LED chip, in addition to the LED chip characteristics, the spectral characteristics depend on the optical characteristics of the phosphor and has a very wide spectral line width. In particular, since the phosphor has a high temperature dependency, the fluorescence efficiency is significantly lowered as the temperature is increased, and thus the measurement is much influenced by the environmental temperature. For this reason, when measuring white LEDs, the error caused by the spectral sensitivity of the instrument does not occur very much, and more attention is paid to the environmental temperature. CIE127: 2007 usually sets the environmental temperature for LED measurement to 25 ° C. It is recommended to specify the measured environmental temperature when measuring at other temperatures.

2. LED measuring device

LED measuring device is a device limited to the optical measurement of the LED. Before we get to the device, let's take a quick look at photometric quantities. The optical measurand starts from the spectral irradiance (W nm-1 cm 2) physically when it comes to detecting light. Spectral radiance is defined as the radiant flux per unit wavelength and per unit area incident on a measurement plane. Again, the unit of radiation flux is equal to the electrical output divided by time divided by energy by W. Spectral radiance can soon be converted to illuminance (lx) and, in addition, can be converted to total luminous flux when used with an integrator or goniometer. In addition, since the spectral irradiance includes all the spectral characteristics, it is the basis for the measurement of color coordinates, correlation color temperature, and center wavelength. In actual LED measurement, the spectral radiance may be measured using a spectroradiometer, and then converted into light illuminance, or the light intensity may be directly measured using a light illuminometer.

2.1 illuminance meter

A light illuminator is a device for measuring light intensity (unit [lx]), which is a combination of a color filter for producing Si photodiode and luminous efficiency V ( λ ), a circular aperture, and an additional electronic device for reading a photocurrent. Consists of Due to the characteristics of the instrument, the process of integrating and converting the spectral radiance into light intensity is performed by the combination of the spectral sensitivity of the color filter and the Si photodiode in hardware. Therefore, the spectral radiance cannot be measured. This is converted into light intensity value. If the spectral sensitivity of the light illuminometer is in error compared to V ( λ ), it is propagated to the error of light intensity. How well the spectral sensitivity of the light illuminometer matches V ( λ ) can be quantified by the coefficient of performance. In addition, the spectral sensitivity error of the light intensity meter can be corrected through a process called color correction or spectral mismatch correction, which requires measuring the relative spectral intensity of the measurement LED and the spectral sensitivity of the detector.

2.2 spectroradiometer

Spectroradiometer is a device for measuring the spectral irradiance of light, it is a multi-purpose device that can be applied to the measurement of LED brightness, radiance, color characteristics. Recently, according to the development of high performance array type photodetectors such as CCD and PDA, spectroradiometer called spectrogaph is widely used in industrial field. These spectroradiometers provide faster measurement speeds compared to spectroradiometers using scanning monochomators. Of course, the scanning spectroradiometer has advantages of less stray light and a wider dynamic range. The amount measured by the spectroradiometer is a spectroradiometer as described above. The spectroradiometer calibrates both the wavelength scale and the spectral radiance scale. The wavelength scale is calibrated by using a gas-tight low pressure discharge lamp such as He, Ar, Hg and Ne. Spectral radiance is also calibrated using a standard bulb. In other words, the spectral irradiance scale means the spectral sensitivity of the spectroradiometer.

3. Total luminous flux

The most important measurement parameter when applying LED to lighting is lighting efficiency [lm / W]. Lighting efficiency is an index that evaluates the light output to electric energy, and the basic amount is the total luminous flux. Literally, it means the total amount of light emitted from a light source. As a measuring method, a angle photometer or an integrating sphere method is used. A photometric photometer is a device that allows you to measure the intensity or illuminance of a test light source for all solid angles, and record the intensity or illuminance as the light source and photodetector are mechanically rotated. The total luminous flux can be calculated by numerically integrating the values recorded with respect to the solid angle. However, this method is difficult to apply in the field because the measurement takes more than a few tens of minutes, the total luminous flux measurement method using the integrating sphere is widely used.

The method of using the integrating sphere is measured by using a standard luminous flux standard LED or a standard luminous flux standard bulb. FIG. 1 shows a general structure of an integrating sphere for measuring luminous flux. As shown in FIG. 1, the bulb socket is located at the center of the integrating sphere and is composed of the auxiliary bulb, the front lampshade, the detector port, the detector, and the shade curtain. The CIE 127 recommendation document states that the diameter of the integrating sphere should be at least 10 cm. However, considering the uniformity of the response function of the integrating sphere, the diameter of 30 [cm] is considered appropriate. Larger integrating spheres have more uniform response characteristics, but due to the limited dynamic range of the photodetector, the detector readings are measured at a low level, resulting in relatively high noise signals.

The measurement is described on the basis of a rigorous comparative measurement, as shown in Figure 1 is measured by taking the ratio by measuring the standard LED and the test LED alternately. However, when measuring spectral characteristics such as color coordinates together, it is recommended to use two kinds of standard bulbs, because the response characteristics according to the wavelength of the integrating sphere must be known. First, the tungsten halogen-type standard incandescent light source is used to calibrate the response characteristic of the detector according to the wavelength of the detector, that is, the relative total spectral radiant flux. It is good to calibrate. In the figure, the test LEDs are directed at an angle of about 90 ° to 100 ° from the light intensity meter, which is a condition that minimizes the error resulting from the nonuniformity of the spatial response function. For more accurate error correction in relation to the spatial response function, it is necessary to calculate or fit the actual integrating sphere dimensions.

Hereinafter, with reference to the accompanying drawings, an automatic optical characteristic measuring apparatus of the LED module using the integrating sphere according to the present invention will be described in detail.

2 is a block diagram for explaining an optical characteristic automatic measuring device of the LED module using the integrating sphere according to the present invention, the system control device 100, the transfer device 200, the shifting device 300, the integrating sphere 400 And a power supply 500. In addition, Figure 3 is a view showing the overall appearance of the automatic measurement device for optical characteristics of the LED module using the integrating sphere according to the present invention. 3 (a) shows a front view, and FIG. 3 (b) shows a perspective view, although the system control apparatus 100 is not shown in FIG. 3, power is supplied to the transfer apparatus 200 and the shift apparatus 300. It is provided at any position of the apparatus of FIG. 3 for feeding.

The system controller 100 is a device for controlling the power supply for driving the transfer apparatus 200 and the shift apparatus 300. The system controller 100 supplies power to the transfer apparatus 200 according to an administrator's power application instruction. When the LED module, in which a plurality of LEDs or LED packages are assembled by the device 200, reaches the shifting device 300, the sensing signal for the arrival of the LED module in the shifting device 300 is received and the transfer is performed. The power supply to the device 200 is stopped. At the same time, the system control apparatus 100 applies power to the shift apparatus 300 so that the shift apparatus 300 lifts the LED module toward the integrating sphere 400. Thereafter, after measuring the optical characteristics of the LED module in the integrating sphere 400, when the LED module is separated from the integrating sphere 400, the system controller 100 supplies power to the shifting device 300 To lower the LED module. Thereafter, when the LED module is placed on the conveyor belt of the transfer apparatus 200, the system controller 100 cuts off the power supplied to the shift apparatus 300, and supplies power to the transfer apparatus 200. Supply. Thereafter, the transfer apparatus 200 uses the supplied power to drive the conveyor belt to transfer the LED module to a place for the next work.

The transfer apparatus 200 automatically transfers the LED module to the shift apparatus 120 according to the power supply of the system control apparatus 100.

4 is a reference view showing the structure of the transfer device, Figure 4 (a) is a view showing the transfer device and the integrating sphere together, Figure 4 (b) is a conveyor belt corresponding to the components of the transfer device ( Reference numeral 210 and a drive motor 220 are shown. According to the administrator's instructions, when the system control apparatus 100 supplies power to the conveying apparatus 200, power is supplied to the drive motor 220 which drives the conveyor belt 210, and by a power supply, a drive motor When the 220 rotates, the rotational force of the drive motor 220 is transmitted to the conveyor belt 210 to drive the conveyor belt 210. As shown in FIG. 4B, the conveyor belt 410 transfers the LED module using two lines. The LED module placed on the conveyor belt 210 is transferred to the shift device 300. Accordingly, as shown in (b) of FIG. 4, the LED module is inserted into the feeding direction and transferred to the shift device 300. After the optical characteristic is measured at the integrating sphere 400, the LED is discharged. The module is transferred.

On the other hand, the transfer device 200, the LED module placed on the conveyor belt 210 may be transferred to the shifting device 300 itself, the transfer jig can be mounted separately according to the model type of the LED module, respectively May be transferred to the shift apparatus 300. To this end, the transfer apparatus 200 is provided with a transfer jig to which the LED module can be mounted.

5 is a reference diagram illustrating an example of a conveying jig conveyed by a conveying apparatus. 5 shows an example of a transfer jig equipped with an LED module. As shown in FIG. 5, the transfer jig in which the LED module is mounted is transferred to the shift apparatus 300 by the conveyor belt 210 of the transfer apparatus 200.

The shift device 300 lifts the LED module transferred from the transfer device 200 in the direction of the integrating sphere 400, that is, in accordance with the power supply of the system controller 100. In order to lift up the LED module, the shift device 300 includes components such as an actuator (Rack and pinion, Ballscrew) using pneumatic and motor rotation operated by a power supply.

The shift device 300 includes a shift jig as a component for lifting the transferred LED module up.

FIG. 6 is a reference diagram illustrating a structure of a shift device. In FIG. 6, an integrating sphere close jig, an LED module insertion jig, and an LED module that form an integrating sphere 400 are included in addition to the shifting device. LED module insertion jig, except for the LED module is a portion corresponding to the shift device 300, the shift device includes a shift jig.

The shift jig is a jig for adjusting alignment so that the LED module can be inserted into the integrating sphere 400 (LED module insertion jig of the integrating sphere 400 described later). To this end, the shift jig includes a stopper block, a jig align pin, and an LED module align pin.

FIG. 7 is a reference diagram illustrating specific components of the shift jig 310 and includes a stopper block 320, a jig alignment pin 330, and an LED module alignment pin 340. When the LED module placed on the stopper block 320, the jig align pin 330, and the LED module align pin 340 is lifted by the shift jig 310, these pins are raised between the two rows of conveyor belts described above. Then, the raised LED module is inserted into the integrating sphere 400.

The stopper block 320 allows the LED module transferred from the transfer apparatus 200 to stop at the shift apparatus 300. To this end, the stopper block 320 is provided with a detection sensor for detecting that the LED module is approaching or leaving the shift device 300. When the detection sensor detects the approach or departure of the LED module, the system controller 100 controls the power supply of the transfer device 200 and the shift device 300. The detection sensor is connected to the system controller 100 by wire or wirelessly. Examples of the sensing sensor may include an optical sensor and a touch sensor.

The jig alignment pin 330 adjusts the alignment of the LED module insertion jig and the shift jig 310 of the integrating sphere 400. The jig alignment pin 330 is aligned with the LED module insertion jig and the shift jig 310.

LED module alignment pin 340 adjusts the alignment of the LED module itself. The LED module alignment pin 340 is an alignment pin for accurately matching the LED module and the probe pins of the power supply when the LED module is lifted up and in close contact with the LED module insertion jig of the integrating sphere 400. to be.

FIG. 8 is a reference diagram illustrating a process in which the shift device lifts the LED module into the integrating sphere, and shows that the shift jig moves toward the LED module insertion jig.

On the other hand, the shifting device 300 lifts the transport jig itself toward the integrating sphere 400 when the transport jig in which the LED module is mounted is transported by the transport device 200.

The integrating sphere 400 measures the optical characteristics of the LED module by using the power provided from the power supply device 500 when the LED module lifted by the shift device 300 is inserted. To this end, the power supply device 500 converts commercial power into power for measuring optical characteristics of the LED module in order to measure optical characteristics of the LED module inserted into the integrating sphere 400, and converts the converted power into integrating sphere. Supply to the LED module of 400. The order in which the power is supplied to the module is to supply power to the module by the probe pin (power supply pin: described below) connected to the connected printed circuit board when the power is supplied to the connected printed circuit board (described below). Contact the module and supply power to the module with the correct force.

In order to insert the LED module, the integrating sphere 400 has an LED module insertion jig in which a predetermined area of the lower part is hollow so that the lifted LED module can be inserted.

9 is a reference view showing an example of the LED module insertion jig and a connection terminal for power supply, Figure 10 is an integrating sphere close contact forming the lower portion of the integrating sphere 400 to be mounted to the LED module insertion jig It is a reference figure which shows the jig 420. As shown in FIG. As shown in FIG. 9, the LED module insertion jig 410 has a structure for sealing all regions other than the region where the LED module is inserted. That is, the region other than the region in which the LED module is mounted has a sealed structure for blocking the outside. The LED module insertion jig 410 is inserted into the integrating sphere close jig 420, as shown in FIG.

The LED module insertion jig 410 is a connecting terminal for directly supplying power to the pattern of the LED module for measuring optical characteristics, and includes a pin block 412, a probe pin 414, and a connecting printed circuit board 416. Doing. The power supply method is a method in which a probe pin is directly contacted and applied to a power supply pattern of a pattern of an LED module. As a method of supplying power to the LED module, there are typically a method of supplying power using a connector and a method of directly contacting a required part of the LED module with a pin. In the present invention, a pin contact method is illustrated. .

As shown in FIG. 10, the integrating sphere close jig 420 is sealed to all regions except for the area of the LED module insertion jig 410 of the integrating sphere 400 to measure the LED module.

On the other hand, the LED module insertion jig 410 may be replaced by distinguishing each of the type according to the model of the LED module. 11 is a reference diagram illustrating another LED module insertion jig that may be replaced according to the model type of the LED module. If the type of the LED module produced is changed in the integrating sphere 400, the LED module insertion jig 410 corresponding to the area in which the LED module is inserted must also be replaced.

12 is a reference diagram for explaining that the total luminous flux is measured by inserting the LED module into the integrating sphere. As shown in FIG. 12, the LED module is inserted into the sealed integrating sphere 400 to measure optical characteristics of the LED module. As shown in FIG. 12, the apparatus for automatic measurement of the LED module using the integrating sphere 400 is an LED in a state in which the LED module transferred to the lower region of the integrating sphere is sealed with respect to the inserted region to measure the LED module. Apply optical power to the module and measure the optical characteristics. In order to measure the optical characteristics of the LED module, first, the integrating sphere must be completely closed because the light source is visible. Second, the illumination should not be illuminated except for the light source used directly for the measurement during the time the normal measurement is taken. Third, make sure no external light enters during the measurement. Fourth, the LED module should be in close contact with the integrating sphere. Under these conditions, the integrating sphere 400 measures the optical characteristics such as the total light speed and color temperature, Spectrum, CRI, uniformity for the LED module inserted in the lower region. The specific contents of the optical characteristics to be measured are replaced with the above-described general contents of optical characteristics.

After that, when the measurement of the optical characteristics for the LED module in the integrating sphere 400 is finished, the system controller 100 lowers the LED module in which the optical characteristics are measured in the integrating sphere 400. Power is supplied to the shift device 300. The shift device 300 removes the pneumatic pressure in the case of pneumatic type so that the LED module is lowered, the operation mechanism using the rotation of the motor is rotated in the downward direction.

Then, the shift device 300 is lowered by shifting the shift jig in which the LED module is placed in the integrating sphere, and the lowered LED module is placed on the conveyor belt composed of two lines of the transfer device 200. Thereafter, when the detection sensor provided in the stopper block 320 of the shift device 300 detects the deviation from the integrating sphere of the LED module, the detection signal is transmitted to the system controller 100. When the sensing sensor receives a detection signal indicating that the LED module is separated, the system controller 100 cuts off the power supplied to the shift device 300 and supplies power to the drive motor 220 of the transfer device 200. . Accordingly, the transfer device 200 transfers the LED module placed on the conveyor belt to the position for the next process.

Hereinafter, a method for automatically measuring optical characteristics of an LED module using an integrating sphere according to the present invention will be described with reference to the accompanying drawings.

13 is a flowchart illustrating a method for automatically measuring optical characteristics of an LED module using an integrating sphere according to the present invention.

First, the transfer apparatus automatically transfers an LED module having a plurality of LEDs or LED packages assembled to the shift apparatus (step 1000). When the system controller supplies power to the transfer device, the conveyor belt of the transfer device is driven to transfer the LED module or transfer jig placed on the conveyor belt to the shift device.

After the 1000th step, the shift device lifts up the LED module transferred from the transfer device (step 1002). In the step of lifting up the LED module transferred from the transfer apparatus, the alignment is adjusted so that the LED module can be inserted into the LED module insertion jig, and after the alignment is adjusted, the LED module is lifted. The process of adjusting the alignment specifically stops the LED module transferred from the transfer apparatus to the shift jig of the shift apparatus. As shown in FIG. 7, when the LED module placed on the stopper block 320, the jig align pin 330, and the LED module align pin 340 is lifted by the shift jig 310, these pins are described above. Ascending between the two rows of conveyor belt, the LED module is thus inserted into the integrating sphere 400. When the stopper block provided in the transfer apparatus detects the approach of the LED module transferred from the transfer apparatus, the detection signal is transmitted to the system controller. The system controller cuts off the power supply to the feeder and supplies power to the shifter. The alignment pins provided on the shift jig of the shift device are used to adjust the alignment of the shift jig and the LED module insertion jig in which the LED module is stopped. After that, adjust the alignment of the LED module itself. Thereafter, the aligned LED module is lifted using the shift jig.

After the step 1002, in the integrating sphere having an LED module insertion jig into which the LED module can be inserted, the optical characteristics of the LED module inserted into the LED module insertion jig are measured (step 1004). Since the LED module insertion jig has a pin block, a probe pin, and a connecting printed circuit board for directly supplying power to the pattern of the LED module for measuring optical characteristics, the probe pin is directly connected to the pattern of the LED module. Touch to apply power and measure optical characteristics. The integrating sphere 400 measures optical characteristics such as the total luminous flux and color temperature, Spectrum, CRI, and uniformity of the LED module inserted into the lower region.

After step 1004, the shift device lowers the LED module in which the optical characteristic is measured (step 1006). When the measurement of the optical characteristic of the LED module at the integrating sphere is finished, the system controller supplies power to the shift device to lower the LED module whose optical characteristic is measured at the integrating sphere. Then, the shift device lowers the shift jig in which the LED module is placed, and the lowered LED module is placed on the conveyor belt composed of two rows of the transport device.

After step 1006, the transfer device transfers the lowered LED module to a position for the next process (step 1008). Then, when the detection sensor provided in the stopper block of the shift device detects the departure of the LED module, it transmits this detection signal to the power supply control device. Upon receiving a detection signal indicating that the LED module is detached from the detection sensor, the system controller cuts off the power supplied to the shifting device and supplies power to the drive motor of the transfer device. Accordingly, the transfer device transfers the LED module placed on the conveyor belt to the position for the next process.

On the other hand, the above-described method for automatically measuring the optical characteristics of the LED module using the integrating sphere of the present invention may be implemented as code / instructions (instructions) / program that can be read by a computer (for example, PLC). For example, it may be implemented in a general-purpose digital computer for operating the code / instructions / program using a computer-readable recording medium. The computer-readable recording medium includes storage media such as magnetic storage media (eg, ROM, floppy disk, hard disk, magnetic tape, etc.), optical reading media (eg, CD-ROM, DVD, etc.) .

The apparatus and method for automatically measuring the optical characteristics of the LED module using the integrating sphere of the present inventors have been described with reference to the embodiment shown in the drawings for clarity, but this is merely illustrative, and those skilled in the art It will be appreciated that various modifications and other equivalent embodiments are possible from this. Accordingly, the true scope of the present invention should be determined by the appended claims.

100: system control
200: transfer device
300: shift device
400: integrating sphere
500: power supply

Claims (15)

Transfer device for automatically transferring the LED module is assembled a plurality of LED or LED package;
A shift device for lifting up the LED module transferred from the transport device;
An LED module insertion jig having a predetermined lower area hollow so that the LED module lifted by the shift device can be inserted, and an integral for measuring optical characteristics of the LED module inserted in the LED module insertion jig phrase; And
And a system controller for controlling a power supply for driving the transfer device and the shift device. The method of claim 1,
The transfer device is provided with a conveyor belt for transferring the LED module to the shift device,
The system controller is a device for automatically measuring the optical characteristics of the LED module using the integrating sphere, characterized in that for controlling the power supply to the motor for driving the conveyor belt. The method of claim 2,
The system controller is configured to control the power supply to the motor to transfer the LED module measured the optical characteristics in the integrating sphere to the position for the next process using the conveyor belt, LED using an integrating sphere Automatic measurement of optical properties of modules. The method of claim 1, wherein the transfer device
The transfer jig equipped with the LED module is transferred to the shift device by using a transfer jig which can be separately mounted according to the model type of the LED module.
The optical characteristic automatic measuring device of the LED module using the integrating sphere, characterized in that for lifting the transfer jig in the shift device. The method of claim 1, wherein the shift device
And a shift jig for adjusting alignment so that the LED module can be inserted into the LED module insertion jig, and lifting the shift jig. The method of claim 5, wherein the shift jig
A stopper block for stopping the LED module transferred from the transfer device in the shift device;
Jig alignment pins for adjusting the alignment of the LED module insertion jig and the shift jig itself; And
The optical characteristic automatic measuring device of the LED module using the integrating sphere, characterized in that it comprises an LED module alignment pin for adjusting the alignment of the LED module. The method of claim 6, wherein the stopper block
It is provided with a detection sensor for detecting that the LED module is approaching and leaving the shift device,
The system controller is a device for automatically measuring the optical characteristics of the LED module using the integrating sphere, characterized in that for controlling the power supply of the transfer device and the shift device, according to the detection result of the sensor. The method of claim 1, wherein the shift device
An optical measuring device for an LED module using an integrating sphere, characterized in that it comprises an actuator (Rack and pinion, Ballscrew) using pneumatic and motor rotation operated by power supply. The method of claim 1, wherein the LED module insertion jig
The optical characteristic automatic measuring device of the LED module using the integrating sphere, characterized in that for sealing all areas other than the region in which the LED module is inserted. The method of claim 1, wherein the LED module insertion jig
Automatic measurement device for optical characteristics of the LED module using the integrating sphere, characterized in that each can be distinguished and replaced according to the model type of the LED module. The method of claim 1, wherein the LED module insertion jig
The optical characteristic automatic measuring device of the LED module using the integrating sphere, characterized in that it comprises a pin block, a probe pin and a connecting printed circuit board for directly supplying power to the pattern of the LED module for measuring the optical characteristic. The apparatus of claim 1, wherein the optical characteristic measuring apparatus of the LED module using the integrating sphere is
The apparatus for automatically measuring optical characteristics of an LED module using an integrating sphere further comprises a power supply for supplying power to the LED module for measuring the optical characteristics of the LED module inserted into the integrating sphere. Automatically transferring the LED module having a plurality of LEDs or LED packages assembled thereon to a shifting device;
Lifting, by the shift device, the LED module transferred from the transfer device;
Optical characteristics of the LED module inserted in the LED module insertion jig in the integrating sphere having an LED module insertion jig having a predetermined lower portion hollow so that the LED module lifted by the shift device can be inserted Measuring;
The shifting device descending the LED module in which the optical characteristic is measured; And
Automatically measuring the optical characteristics of the LED module using the integrating sphere comprising the step of transferring the lowered LED module to the position for the next process the transfer device. The method of claim 13, wherein the step of lifting up the LED module transferred from the transfer device
Adjusting the alignment so that the LED module can be inserted into the LED module insertion jig, and after adjusting the alignment, lifting the LED module, characterized in that the automatic measurement method of the LED module using the integrating sphere. 15. The method of claim 14, wherein the step of lifting up the LED module transferred from the transfer device
Stop the LED module conveyed from the transfer device to the shift jig of the shift device, adjust the alignment of the shift jig and the LED module insertion jig in which the LED module is stopped, and adjust the alignment of the LED module After the adjustment, the method for automatically measuring the optical characteristics of the LED module using the integrating sphere, characterized in that lifting the LED module up.

Images