02/04/2020

INTRODUCTION ABOUT PS UNIT

INTRODUCTION ABOUT PS UNIT

 

I. General introduction:

PS Unit is a unit that measures luminous intensity and chromaticity of luminescent materials such as LEDs.

Each PS Unit has 48 optical fibers to measure. Up to 20 units can be connected to one inspection machine.

Please use the self-powered type USB hub when the main unit’s USB port is insufficient.

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Figure 1: Structure of PS Unit

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Figure 2: Actual photo of PS Unit

II. Structure and notes:

1. Photo sensor unit

Please fix the sensor unit to body of the jig when using it.

Using the attached L bracket for attachment, loosen the screw (2 places) on the side of the sensor unit to body of the jig (L Insert the metal fittings and tighten the screws ).

The mounting direction is arbitrary. (It does not matter which surface is on the top).

Please do not to apply excessive force to the optical fiber.

2. Ferrule

It is a light detector attached to the one side of the optical fiber. A jig was placed so as to face the LED of the target board.

Adjust the hole diameter on the jig side appropriately so that it can be press-fitted with moderate force.

Because the core of the optical fiber is exposed in the detection part, please be careful not to get dirty and scratched.

Please do not to apply excessive force to the optical fiber.

With optical fibers not to be used for inspection, protect the ferrule part with a bag etc.

III. Check the results received ( Receive frame, character string )

Receive verification check, string check, serial receive data is being inspected. By “Detail” button, the received data (byte) will be displayed.

Example image data received:

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Description of detail data receive table

Item

Description

ByteIt is a byte number. The 1000th digit of the number is the serial port number of the inspection machine. The order 3 digits are the order of the received bytes. The lower 3 digits = 000 stores the error code.
NameIt is the name of the port. The name is written in script.
OrderIf an error code is displayed, the received value of that line is an error code. Numbers indicate reception order.
Rx dataError code, or received data.In the case of character string inspection, the character when interpreting the data as ASCII code is referred to as a single quot

It is displayed surrounded by tessions.

OK dataIt is a normal error code or received data.When MASK is displayed, if the logical product of the received value and MASK becomes normal, it is normal

In the case of character string inspection, the character when interpreting the data as ASCII code is referred to as a single quot

It is displayed surrounded by tessions.

MaskMask data of received data.
ResultIf it is determined that the byte data is normal, “normal” (PASS) is displayed. In case of explanation of defect contents is displayed.

 

IV. Measurement details:

The optical measurement inspection is one step on the inspection result table, but actually, with respect to all the photosensors of interest

Light intensity and chromaticity are measured. If you click the “details” button, you can display all measurement results.

Measured values ​​and normal range are expressed in light intensity (Y), chromaticity (CX, CY). Plot the sensor measurement result (chromaticity and light intensity) on the graph.

Example of display of optical measurement details light.

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Item

Description

SensorIt is the fiber number of photosensor.
NameIt is the name of the port. The name is written in script.
SensIt is a measure of the measurement color. It is different from the actual light color.
OKIt is a measure of the measured color when swathed. It is different from the actual light color.
TimeIt is the exposure time at measurement. In the case of the same light source, the luminous intensity (Y) measured value is proportional to the exposure time will be increase. Normally, the exposure time is automatically determined at the time of sucking up the sample.In the case where it is impossible to emit light for a long time due to a problem of heat generation, when the exposure time is regulated by a script.
YIt is a measurement value of light intensity. It is not a numerical value showing absolute luminosity, but the exposure time is constant.The measured Y value will be proportional to the light intensity (not gamma corrected).
minIt is the minimum value of the normal range of light intensity (Y). If a number is followed by a “*” symbol, it indicates that the value has been adjusted manually.If the symbol is not attached after the numerical value, the value sucked up from the sample is the standard. To sample

The allowable range of error to be made is described in the script.

maxIt is the same as the above min except that the maximum value of the normal range is displayed.
CXxy It is 1000 times the value of x of chromaticity. In general xy chromaticity display, x = 0.3 y = 0.31 is a bookIt corresponds to CX = 300, CY = 310 on the inspection machine.

The chromaticity value does not guarantee absolute accuracy.

minIt is the minimum value of the normal range of CX.If a number is followed by a “*” symbol, it indicates that the value has been adjusted manually.

If the symbol is not attached after the numerical value, the value sucked up from the sample is the standard.

The allowable range of error to be made is described in the script.

maxIt is the same as the above min except that the maximum value of the normal range is displayed.
CYxy It is 1000 times the value of y of chromaticity. In general xy chromaticity display, x = 0.3 y = 0.31 is a bookIt corresponds to CX = 300, CY = 310 on the inspection machine.

The chromaticity value does not guarantee absolute accuracy.

minIt is the minimum value of the normal range of CY.If a number is followed by a “*” symbol, it indicates that the value has been adjusted manually.

If the symbol is not attached after the numerical value, the value sucked up from the sample is the standard. The allowable range of error to be made is described in the script.

maxIt is the same as the above min except that the maximum value of the normal range is displayed.
Result“Normal” (PASS) will be displayed if it is judged as normal in the inspection step. When it is fixed, explanation of defect content is displayed.

1. Light measurement details (polygonal range)

The outline of the inspection and display is the same as the details of the optical measurement described above, but if it is within the polygon range on the chromaticity graph

It is a method to make a pass / fail judgment. The polygon showing the chromaticity threshold value is arbitrary vertex from triangle to octagon

It is a score. The number of vertices of a polygon and the coordinates of each vertex are determined at the time of script design, but for each coordinate,

It can be changed by the normal min / max correction method. Number of vertices decided at script design changed by min / max correction can not.

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 2. Light measurement details (Individual sensor display)

When clicking the sensor name on the light measurement detail screen, the measurement result of only that sensor is plotted and chromaticity

And the allowable range of light intensity with a yellow frame.

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3. Light measurement details (polygonal range) (Individual sensor display)

As with the individual sensor display, clicking on the name of the sensor in the list, the measurement result of only that sensor

Plot the results and display the tolerance range of chromaticity and luminosity in yellow borders.

You can change the display magnification in the chromaticity graph.

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V. PS Unit Specification

Color systemCIE Yxy
Measurement itemLuminous intensity Y ; chromaticity CX ; chromaticity CY.CX, CY is 1000 times the value of CIE color system x, y.
Measurement methodOptical fiber + color photosensor
Exposure time0.17 ms to 95 ms (Automatically set at sample pickup)
Measurement time20 ms to 400 ms (per step)
Host connectionUSB MINI-B connector
External connection10P connector
Display LED ( Notify )2 (power supply operation)
Number of measurement points48 (per unit)
Number of units connected20 (Number of units that can be connected to one main unit)
Unit case dimensions70 mm (width) x 110 mm (depth) x 32 (height)  Excluding protrusions
Optical fiberMulti core outer diameter 1.0 φ length 610 mm ± 30 mm (from the unit case exit to the ferrule tip)
Ferrule dimensionsMaximum diameter 3.0 φ Jig insertion part diameter 2.61 φ Length 25 mm

 

 

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