參數(shù)資料
型號: HSDL-3603-207
廠商: Avago Technologies Ltd.
英文描述: IrDA㈢ Data Compliant 4 Mbit/s Infrared Transceiver
中文描述: 紅外線㈢數(shù)據(jù)符合4 Mbit / s的紅外收發(fā)器
文件頁數(shù): 26/29頁
文件大?。?/td> 226K
代理商: HSDL-3603-207
26
Appendix E: Window Design
Optical Port Dimensions for HSDL-
3603:
To ensure IrDA compliance,
some constraints on the height
and width of the window exist.
The minimum dimensions ensure
that the IrDA cone angles are met
without vignetting. The maximum
dimensions minimize the effects
of stray light. The minimum size
corresponds to a cone angle of
30
°
and the maximum size corre-
sponds to a cone angle of 60
o
.
In the figure below, X is the width
of the window, Y is the height of
the window and Z is the distance
from the HSDL-3603 to the back
of the window. The distance from
the center of the LED lens to the
center of the photodiode lens, K,
is 7.08 mm. The equations for
computing the window dimen-
sions are as follows:
X = K + 2
*
(Z + D)
*
tanA
Y = 2
*
(Z + D)
*
tanA
The above equations assume that
the thickness of the window is
negligible compared to the dis-
tance of the module from the back
of the window (Z). If they are com-
parable, Z' replaces Z in the above
equation. Z' is defined as
Z' = Z + t/n
where ‘t’ is the thickness of the
window and ‘n’ is the refractive
index of the window material.
The depth of the LED image in-
side the HSDL-3603, D, is 8 mm.
‘A’ is the required half angle for
viewing. For IrDA compliance,
the minimum is 15
°
and the maxi-
mum is 30
°
. Assuming the thick-
ness of the window to be
negligible, the equations result in
the following tables and graphs:
D
Z
K
A
IR TRANSPARENT
WINDOW
OPAQUE
MATERIAL
OPAQUE
MATERIAL
IR TRANSPARENT WINDOW
X
Y
Figure 31. Window design diagram.
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相關代理商/技術參數(shù)
參數(shù)描述
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