OVERVIEW

This device performs high-speed measurement and sorting of LED electrical and optical characteristics while synched with control signals from the LED production line inspection and sorting system. The LSCM then provides that pass/fail information to the system. The LSCM is equipped with the function to test both electrical and optical characteristics by applied voltage and current to the LED. This test device was designed to integrate test functions required by the inspection and sorting system into one compact body.
The LSCM uses I/O signal control lines to feedback test start and pass/fail results to the inspection and sorting system and also runs tests synched to the system timing. The LSCM also uses the accessory software library (DLL) to inform customer software of acquisition of measurement and pass/fail result data or measure- ment and pass/fail condition data.
The LSCM uses the uniform diffusion polychromator technique to make distortion-free spectroscopic measurements that acquire highly accurate light source color information based on JIS (CIE) with device variations below 0.004 for all 3 RGB colors on XY chromaticity coordinates per JIS Z 8724.

TEST PARAMETER

Optical Test

・Luminous Intensity

・Peak Wavelength

・Correlated Color Temperature (CCT)

・Chromaticity Coordinate(x, y)

・Full Width Half Maximum(FWHM)

・Chromaticity Coordinate(u, v)

・Sub-Peak Wavelength

・Color Rendering Index (CRI)

・Radiant Flux

・Chromaticity Coordinate(u’, v’)

・Centroid Wavelength

・Total Luminous Flux

・Dominant Wavelength

Electrical Test

• Polarity Judgment (POL)
• Forward Voltage (VF)
• Forward Current (IF)
• Reverse Voltage (VR)
• Reverse Current (IR)

System Configuration Example

Electronic pass/fail function

Current pass/fail

– Contact pass:
fail LED polarity conduct state(threshold judgment)
– Polarity pass:
fail LED polarity direction (threshold judgment)
– If pass:
fail Forward current value vertical range judgment

Voltage pass/fail

– Ir pass:
fail Reverse current value vertical range judgment
– Vf pass:
fail Forward voltage value vertical range judgment
– Vr pass:
fail Reverse voltage value vertical range judgment

Spectrum Functions

– Spectroscopy:
Czerny-Turner spectroscopy
– Wavelength:
300nm~800nm
– Wavelength Resolution:
FWHM<2nm at Hg:546nm - Detection Element: Line Senso(r MOS type:1024 elements or BT-CCD temp. control type:1024 elements) - Detection Method: 16Bit A/D conversion sampling method(Effect:14Bit) - Wavelength Accuracy: ±0.5nm(Theological value) - Light Incidence Method: Bundle type fiber probe - Variations by device: RGB3color xy<0.004 (xy Chromaticity coordination:JIS Z8724)

Color measurement function

Light source color measurement

Light incidence optical type:

Diffusion Plate+Light incidence
by fiber probe Fiber probe is standard equipment.
Diffusion plate specification will be fixed upon consultation.

Spectrometer measurement:

By Czerny-Turner spectroscopy Light source information is acquired by operation from Luminosity information is acquired by operation from optical spectrum and intercomparison coefficient.

Color Pass/Fail Function

Spectrum Distribution Pass/Fail

– 1stPeak wavelength judge:
Vertical range judgment of wavelength value of Max light intensity
– 1stpeak intensity judge:
Vertical range judgment of max light intensity
– 1st peak full width at half max.:
Vertical range judge of full width at half max of max. light intensity
– 2nd peak wavelength judge:
Vertical range judge of the 2nd light intensity
– 2nd peak intensity judge:
The 2nd light intensity vertical range judge
– 2nd peak full width of half max.:
The 2nd light intensity vertical range judge of full width of half max.

Light source color pass/fail

– xy chromaticity coordinate judge:
arch tunnel set, circle reel & ovalreel range judge
– Uv chromaticity coordinate judge:
arch tunnel set, circle reel & oval reel range judge
– u’v’ chromaticity coordinate judge:
arch tunnel set, circle reel & oval reel range judge
– Dominant wavelength(DW) judge:
Spectrum locus dominant wavelength vertical range judge.
– Excitation purity (EP) judge:
Spectrum locus excitation purity vertical range.
– Black body radiation locus deviation (Duv) judge:
Black body radiation locus deviation vertical range judgment
– Correlated color temperature (Tcp) judge:
Black body radiation locus correlated color temperature vertical range
– Avg. color rendering index (Ra) judge:
Avg. color rendering index vertical range judge
Special color (R1-R15) judge:
Special color rendering index(15 colors:each color)vertical range judge

LSCM SPECIFICATIONS BY MODEL