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an element of two PN-junctions (photodiode) vertically incorporated into one chip with its thickness of silicon acting as an optical filter. This means, as shown in Fig. 2, that with the lights of short wavelength absorbed near the surface of silicon and those of long wavelength going deeper to be absorbed, the photodiode PDl of the less deep PN-junction will have greater sensitivity to short wavelength lights while the photodiode PD2 0f the deeper PN- junction will have greater sensitivity to long wavelength lights. These characteristics are shown in Fig. 3. According to this spectral sensitivity, as a signal processing method for picking up a signal (color signal) corresponding to its wave- length of light, the short circuit current ratio between the two photodiodes above mentioned is used.