Appeal No. 96-0949
Application 08/236,091
circuit means for providing an analog signal representing the
strength of the magnetic field as well as threshold detecting
means for providing a threshold output signal when the analog
output of the sensor is above a predetermined magnitude. All
of these features have not been asserted to be taught by this
reference by the examiner. Laib's overall purpose is to guide
the vehicle along a predetermined path determined by the
buried cable 18 within the slot 16 by use of the vehicle
controller 12 sensing relative vehicle position through Hall
effect sensors 28, 30 and 54, 56 in Figures 1 and 2. These
sensors sense the magnetic fields of the buried permanent
magnets 24, 25 in these figures. The sensors are of the
nature to sense field strength of the magnets buried in the
floor.
The discussion of Figures 3 and 4 of Laib, beginning at
column 5, line 50 through the end of the disclosure indicate
that the Hall effect magnetic field strength sensors are
utilized to ensure that the vehicle of the overall system is
centered along the travel path and travels in close proximity
to the buried magnets with minor deviations. At least with
respect to Figure 4, the analog signals derived from the Hall
4
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