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C3683-01 View Datasheet(PDF) - Unspecified

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Description
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C3683-01 Datasheet PDF : 0 Pages
Characteristic and use
Figure 3-1 Structure chart, equivalent circuit (duo-lateral type PSD)
ANODE (X1)
CATHODE (Y2)
Rp
CATHODE (Y1)
P
ANODE (X2)
D Cj Rsh
Rp
P : CURRENT GENERATOR
D : IDEAL DIODE
Cj : JUNCTION CAPACITANCE
Rsh: SHUNT RESISTANCE
Rp : POSITIONING RESISTANCE
KPSDC0007EA
Figure 3-2 Active area chart (duo-lateral type PSD)
LX
Y2
Figure 3-4 Active area chart (tetra-lateral type PSD)
LX
Y2
X1
y
X2
x
ACTIVE AREA
Y1
KPSDC0011EA
l Position conversion formula (See Figure 3-4.)
IX2 - IX1 = 2x ........ (3-3)
IX1 + IX2 LX
IY2 - IY1 = 2y ........ (3-4)
IY1 + IY2 LY
X1
y
X2
x
ACTIVE AREA
Y1
KPSDC0011EA
l Position conversion formula (See Figure 3-2.)
IX2 - IX1 = 2x ........ (3-1)
IX1 + IX2 LX
IY2 - IY1 = 2y ........ (3-2)
IY1 + IY2 LY
3-2 Tetra-lateral type PSD
The tetra-lateral type has four electrodes on the upper
surface, formed along each of the four edges. Photocur-
rent is divided into 4 parts through the same resistive
layer and extracted as position signals from the four
electrodes. Compared to the duo-lateral type, interaction
between the electrodes tends to occur near the corners
of the active area, making position distortion larger. But
the tetra-lateral type features an easy-to-apply reverse
bias voltage, small dark current and high-speed re-
sponse. The light input position for the tetra-lateral type
shown in Figure 3-4 is given by conversion formulas (3-
3) and (3-4), which are the same as for the duo-lateral
type.
3-3 Pin-cushion type (improved tetra-lateral type) PSD
This is a variant of the tetra-lateral type PSD with an im-
proved active area and reduced interaction between elec-
trodes. In addition to the advantages of small dark current,
high-speed response and easy application of reverse bias
that the tetra-lateral type offers, the circumference distor-
tion has been greatly reduced. The light input position of
the pin-cushion type shown in Figure 3-6 is calculated from
conversion formulas (3-5) and (3-6), which are different
from those for the duo-lateral and tetra-lateral types.
Figure 3-5 Structure chart, equivalent circuit (pin-cushion type PSD)
ANODE (X1)
ANODE (Y1)
ANODE (Y2)
Rp
ANODE (X2)
CATHODE
P
D Cj Rsh
P : CURRENT GENERATOR
D : IDEAL DIODE
Cj : JUNCTION CAPACITANCE
Rsh: SHUNT RESISTANCE
Rp : POSITIONING RESISTANCE
KPSDC0009EA
Figure 3-6 Active area chart (pin-cushion type PSD)
LX
Y2
Figure 3-3 Structure chart, equivalent circuit (tetra-lateral type PSD)
Rp
ANODE (X1)
ANODE (Y2)
X1
y
X2
x
ACTIVE AREA *
ANODE (Y1)
ANODE (X2)
CATHODE
P D Rsh
Cj
P : CURRENT GENERATOR
D : IDEAL DIODE
Cj : JUNCTION CAPACITANCE
Rsh: SHUNT RESISTANCE
Rp : POSITIONING RESISTANCE
KPSDC0008EA
Y1
* Active area is specified at the inscribed square.
KPSDC0012EA
l Position conversion formula (See Figure 3-6.)
(IX2 + IY1) - (IX1 + IY2) = 2x ........ (3-5)
IX1 + IX2 + IY1 + IY2
LX
(IX2 + IY2) - (IX1 + IY1) = 2y ........ (3-6)
IX1 + IX2 + IY1 + IY2
LY
6
 

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