Law Offices of David G. Posz
Photo sensor with signal processing circuit
A photo sensor has a first silicon chip and a second silicon chip mounted on the first silicon chip. Photodiodes are formed in an upper surface portion of the second silicon chip to transform light into electric signals, and circuit elements such as a transistor are formed in an upper surface portion of the first silicon chip to form a signal processing circuit, which manipulates the electric signals from the photodiodes. A metallic thin film is provided on the lower surface of the second silicon chip to cover the circuit element as a shielding film.
Denso Corporation
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Inao Yasutoshi
Toyoda Suzuki