4.2 General guidelines for irradiation distance and UV intensity
Fix the LED head to a jig at the appropriate distance from the workpiece, according to the size of the area to be irradiated (irradiation diameter) and the required UV intensity.
General guidelines for work distance (WD) and UV intensity are offered below.
■UV intensity data (typical characteristics)
LED head: ANUJ6170
UV intensity (mW/cm2)UV intensity (mW/cm2)
UV intensity (mW/cm2)
UV intensity (mW/cm2)
UV intensity (mW/cm2)
14,000 | ANUJ6423 (φ3mm) | |
WD=10 | ||
| ||
12,000 | WD=12 | |
WD=14 | ||
10,000 | WD=16 | |
WD=20 | ||
8,000 |
| |
6,000 |
| |
4,000 |
| |
2,000 |
| |
0 |
| |
| ||
| Irradiation area (mm) | |
12,000 | ANUJ6424 (φ4mm) | |
WD=10 | ||
| ||
10,000 | WD=12 | |
WD=15 | ||
| WD=20 | |
8,000 | WD=25 | |
WD=30 | ||
| ||
| WD=50 | |
6,000 |
| |
4,000 |
| |
2,000 |
| |
0 |
| |
| ||
| Irradiation area (mm) | |
6,000 | ANUJ6426 (φ6mm) | |
WD=10 | ||
| ||
| WD=15 | |
5,000 | WD=20 | |
| WD=25 | |
4,000 | WD=30 | |
WD=40 | ||
| WD=50 | |
3,000 |
|
2,000
1,000
0 
Irradiation area (mm)
4,000 ANUJ6428 (φ8mm)
WD=10
3,500WD=15
WD=20
3,000WD=25
WD=30
2,500WD=40
2,000 | WD=50 | |
| ||
1,500 |
| |
1,000 |
| |
500 |
| |
0 |
| |
| ||
| Irradiation area (mm) | |
2,000 | ANUJ6420 (φ10mm) | |
WD=10 | ||
1,800 | ||
WD=15 | ||
1,600 | WD=20 | |
1,400 | WD=25 | |
WD=30 | ||
1,200 | WD=50 | |
1,000 |
| |
800 |
| |
600 |
| |
400 |
| |
200 |
| |
0 |
|
Irradiation distance vs intensity and area
If an irradiation area of 6 mm diameter
is irradiated at an intensity of 500 mW/cm2 or higher, draw lines on the graph at ±3 mm and 500 mW/cm2. Find the irradiation distance line that covers the area surrounded by the drawn lines. In this example,
the ANUJ6428 head can maintain
an intensity of 500 mW/cm2 or higher for a
by setting the irradiation distance to 50 mm.
UV intensity (mW/cm2)
4,000 ANUJ6428 (φ8mm)
WD=10
3,500WD=15
WD=20
3,000WD=25
WD=30
2,500WD=40
WD=50
2,000 1,500 1,000
500 0
Irradiation area
(mm)
Irradiation area (mm)
[UV intensity level: 100% Room temperature: 25°C With a cooling device attached] * See page 11 for the dimensions of the cooling device.
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