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ISL29001IROZ-T7 Fiches technique(PDF) 9 Page - Intersil Corporation

No de pièce ISL29001IROZ-T7
Description  Light-to-Digital Sensor
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29001IROZ-T7 Fiches technique(HTML) 9 Page - Intersil Corporation

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9
FN6166.5
February 8, 2007
n = 1.85. This is a fudge factor to scale back the sensitivity
up to ensure Equation 4 is valid.
k = 7.5. This is a scaling factor for the IR sensitive Diode 2.
Flat Window Lens Design
A window lens will surely limit the viewing angle of the
ISL29001. The window lens should be placed directly on top
of the ISL29001. The thickness of the lens should be kept at
minimum to minimize loss of power due to reflection and
also to minimize loss of loss due to absorption of energy in
the plastic material. A thickness of t = 1mm is recommended
for a window lens design. The bigger the diameter of the
window lens the wider the viewing angle is of the ISL29001.
Table 4 shows the recommended dimensions of the optical
window to ensure both 35° and 45° viewing angle. These
dimensions are based on a window lens thickness of 1.0mm
and a refractive index of 1.59.
Window with Light Guide Design
If a smaller window is desired while maintaining a wide
effective viewing angle of the ISL29001, a cylindrical piece of
transparent plastic is needed to trap the light and then focus
and guide the light on to the ISL29001. Hence the name light
guide or also known as light pipe. The pipe should be placed
directly on top of the ISL29001 with a distance of D1 = 0.5mm
to achieve peak performance. The light pipe should have
minimum of 1.5mm in diameter to ensure that whole area of
the sensor will be exposed. See Figure 13.
DLENS
t
D1
DTOTAL
∅ = Viewing angle
WINDOW LENS
ISL29001
FIGURE 12. FLAT WINDOW LENS
TABLE 4. RECOMMENDED DIMENSIONS FOR A FLAT
WINDOW DESIGN
DTOTAL
D1
DLENS @ 35
VIEWING ANGLE
DLENS @ 45
VIEWING ANGLE
1.5
0.50
2.25
3.75
2.0
1.00
3.00
4.75
2.5
1.50
3.75
5.75
3.0
2.00
4.30
6.75
3.5
2.50
5.00
7.75
t = 1
Thickness of lens
D1
Distance between ISL29001 and inner edge of lens
DLENS
Diameter of lens
DTOTAL
Distance constraint between the ISL29001 and lens
outer edge
* All dimensions are in mm.
DLENS
t
L
DLENS
LIGHT PIPE
ISL29001
D2
D2 > 1.5mm
FIGURE 13. WINDOW WITH LIGHT GUIDE/PIPE
ISL29001


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