hsdl-3209 ETC-unknow, hsdl-3209 Datasheet - Page 16

• Manufacturer Part Number: hsdl-3209
• Description: Irda Data Compliant Low Power 115.2 Kbit/s Infrared Transceiver
• Manufacturer: ETC-unknow

Shape of the Window
From an optics standpoint, the
window should be flat. This
ensures that the window will
not alter either the radiation
pattern of the LED, or the
receive pattern of the
photodiode.
If the window must be curved
for mechanical or industrial
design reasons, place the same
curve on the back side of the
window that has an identical
radius as the front side.
Flat Window
(First choice)
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Data subject to change.
Copyright © 2004 Agilent Technologies, Inc.
August 19, 2004
5989-1520EN
While this will not completely
eliminate the lens effect of the
front curved surface, it will
significantly reduce the effects.
The amount of change in the
radiation pattern is dependent
upon the material chosen for
the window, the radius of the
front and back curves, and the
distance from the back surface
to the transceiver. Once these
items are known, a lens design
can be made which will
eliminate the effect of the
front surface curve.
Curved Front and Back
(Second choice)
The following drawings show
the effects of a curved window
on the radiation pattern. In
all cases, the center thickness
of the window is 1.5 mm, the
window is made of
polycarbonate plastic, and the
distance from the transceiver
to the back surface of the
window is 3 mm.
Curved Front, Flat Back
(Do not use)