Range finder and method of reducing signal noise therefrom
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United States of America Patent
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Feb 19, 2008
Grant Date -
Sep 22, 2005
app pub date -
Mar 8, 2005
filing date -
Mar 18, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A range finder includes an optical sensor circuit including optical sensors and an integrator circuit disposed for the optical sensors. It further includes selection switches (MOSFETs), which selectively connect optical sensors to the integrator circuit, non-selection switches (MOSFETs), and a biasing voltage circuit or other photoelectron removing device. The non-selection switches (MOSFETS) are switched on to connect the unselected optical sensors to the biasing voltage circuit so that the photoelectron current (photoelectrons) generated in the unselected optical sensors can flow to the biasing voltage circuit but not to the integrator circuit. The range finder can reduce the noises in the unselected optical sensors and measure the object distance accurately.
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