| 摘要 |
An input document detecting method includes the steps of: (a) modulating a light source of a relative-type optical sensor with a coded digital/analog signal; (b) emitting a code-modulated light beam and directing it toward the object; (c) collecting the reflected code-modulated light beam with a receiver portion of the optical sensor; (d) forwarding the signal from the reflected light beam through an AC amplifier; and (e) feeding the amplified signal to a decoder. Also included is a system (10) for detecting the presence of an object including: a) a modulator (11) and a driver (12); b) a reflective-type optical sensor (13) with an analog output, and a lightsource; an IR transmitter and a receiver portion with a built-in IR filter for collecting a reflected code-modulated light beam; c) a high gain AC amplifier (14) for amplifying the signal from the reflected light beam; and d) a decoder (15).
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