Appeal No. 1999-0236
Application 08/624,173
lines 21-24 and 28-30; col. 25, lines 59-62). In standby (low
power) mode, the LED is chopped with the same amplitude and
on-time pulse width as during normal operation, but with a
0.8% duty cycle (col. 4, lines 24-27; col. 25, lines 64-67),
which reduces the average LED current by over 98% (col. 15,
lines 22-23). If no reflection has been detected recently,
the scanner goes into a low-power mode in which the LED 80 is
pulsed at a very low duty cycle, reducing the power
consumption to a small fraction of its operating value, and as
soon as some reflection of light is detected, the circuitry
switches to the operational mode and the modulation duty cycle
of the LED 80 increases to 50% (col. 11, line 67 to col. 12,
line 7). Sherman discloses the scanner as a wand, although it
could take other forms (col. 2, lines 47-50). Although
figure 1 shows the wand at a distance from the surface and
projecting a light beam 20, the wand is described as having a
translucent window used to contact a surface upon which the
bar code symbol is printed and through which the beam of
light 20 is transmitted and received (col. 3, lines 25-29).
Honda discloses a code mark (bar code) reader. An
infrared camera 6 is mounted in a focus adjustable manner
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