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S5629-02 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 16 page 6 l Position conversion formula (See Figure 3-2.) 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. 3-2 Tetra-lateral type PSD Figure 3-1 Structure chart, equivalent circuit (duo-lateral type PSD) Figure 3-2 Active area chart (duo-lateral type PSD) KPSDC0007EA KPSDC0011EA 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. l Position conversion formula (See Figure 3-4.) l Position conversion formula (See Figure 3-6.) 3-3 Pin-cushion type (improved tetra-lateral type) PSD Figure 3-3 Structure chart, equivalent circuit (tetra-lateral type PSD) KPSDC0008EA Figure 3-4 Active area chart (tetra-lateral type PSD) KPSDC0011EA = ........ (3-1) IX2 - IX1 IX1 + IX2 2x LX = ........ (3-2) IY2 - IY1 IY1 + IY2 2y LY Figure 3-5 Structure chart, equivalent circuit (pin-cushion type PSD) Figure 3-6 Active area chart (pin-cushion type PSD) KPSDC0012EA KPSDC0009EA = ........ (3-3) IX2 - IX1 IX1 + IX2 2x LX = ........ (3-4) IY2 - IY1 IY1 + IY2 2y LY = ........ (3-5) (IX2 + IY1) - (IX1 + IY2) IX1 + IX2 + IY1 + IY2 2x LX = ........ (3-6) (IX2 + IY2) - (IX1 + IY1) IX1 + IX2 + IY1 + IY2 2y LY Characteristic and use LX Y2 X2 X1 Y1 x y ACTIVE AREA LX Y2 X2 X1 Y1 x y ACTIVE AREA LX Y2 X2 X1 Y1 x y ACTIVE AREA * * Active area is specified at the inscribed square. ANODE ( X1) ANODE (X2) CATHODE ( Y2) CATHODE (Y1) Rp PD Cj Rsh P D Cj Rsh Rp Rp : CURRENT GENERATOR : IDEAL DIODE : JUNCTION CAPACITANCE : SHUNT RESISTANCE : POSITIONING RESISTANCE ANODE (X1) ANODE (Y2) ANODE (X2) ANODE (Y1) CATHODE PD Cj Rsh P D Cj Rsh Rp Rp : CURRENT GENERATOR : IDEAL DIODE : JUNCTION CAPACITANCE : SHUNT RESISTANCE : POSITIONING RESISTANCE Rp P D Cj Rsh P D Cj Rsh Rp ANODE ( X2) ANODE ( Y1) ANODE ( X1) ANODE ( Y2) CATHODE : CURRENT GENERATOR : IDEAL DIODE : JUNCTION CAPACITANCE : SHUNT RESISTANCE : POSITIONING RESISTANCE |
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