Travel-distance signal generator for vehicles
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United States of America Patent
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-
Jun 7, 1983
Grant Date -
N/A
app pub date -
Jun 3, 1980
filing date -
Jun 25, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal generator which generates one pulse for each predetermined distance of travel of a vehicle. A rotary member is driven by the rotation of a wheel of the vehicle, and the rotary member has arranged thereon reflecting and non-reflecting portions alternately with each other about a rotary shaft of the rotary member. A pair of optical transmission lines are disposed to confront at one end the surface of the rotary member on which the reflecting and non-reflecting portions are arranged. Light is emitted from a light emitting element to the other end of one of the optical transmission line, and light reflected by the rotary member is incident to the other optical transmission line and received by a photo detector provided at the other end of the optical transmission line. In dependence on whether the reflecting or non-reflecting portion of the rotary member lies opposite to the optical transmission lines, the output from the photo detector varies to provide a travel-distance signal.
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