US Patent No. 9,216,601

ELECTRIC DEVICE AND PRINTING APPARATUS USING THE SAME


Patent No. 9,216,601
Issue Date December 22, 2015
Title Electric Device And Printing Apparatus Using The Same
Inventorship Hironori Naka, Kawasaki (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 9,216,601

1. An electric device which performs turn on/off control of a plurality of light emitting elements, and key press detection
of a plurality of switches, the device comprising:
a plurality of general purpose input/output ports configured to output driving signals to the plurality of light emitting
elements, and input signals indicating key press from the plurality of switches; and

a control unit configured to time-divisionally perform the turn on/off control of the plurality of light emitting elements
and control of the key press detection of the plurality of switches by periodically repeating a predetermined number of time
zones, whose number is equal to/more than a number of the light emitting elements, and switching between an input state and
output state of each of the plurality of general purpose input/output ports in unit of the single time zone, wherein

the plurality of light emitting elements include at least a first light emitting element and a second light emitting element,
the plurality of switches include at least a first switch, and
the predetermined number of time zones includes a time zone during which control of turn on/off of both the first light emitting
elements and the second light emitting element are performed, and another time zone during which control of turn on/off of
the first light emitting element and control of key press detection the first switch are performed.