HSDL-3603 datasheet(21/24 Pages) HP

Part #	HSDL-3603

Description	IrDA짰 Data Compliant 4 Mbit/s Infrared Transceiver

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Manufacturer	HP [Agilent(Hewlett-Packard)]

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21

Appendix D: 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 60º.

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 25. Window design diagram.

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HSDL-3603 Datasheet(PDF) 21 Page - Agilent(Hewlett-Packard)

HSDL-3603 Datasheet(HTML) 21 Page - Agilent(Hewlett-Packard)

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