Photography – With object illumination for exposure – With power supply detail
Reexamination Certificate
2008-05-09
2010-11-16
Perkey, W. B. (Department: 2862)
Photography
With object illumination for exposure
With power supply detail
Reexamination Certificate
active
07835640
ABSTRACT:
Various embodiments are described herein for a method and related apparatus for safely operating a camera flash on a mobile device powered by a battery module. Upon determination that the camera flash needs to be activated the method comprises measuring several battery parameters including the voltage and temperature of the battery module. An equivalent series resistance (ESR) of the battery module is determined based on the battery temperature. The maximum flash current is then determined based on the battery voltage, and ESR along with potential current loads that may occur during operation of the camera flash, and a minimum battery voltage for safe operation of the mobile device where the battery voltage has been adjusted if needed. The device is then configured to draw a current from the battery module that is not greater than the maximum flash current.
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Book Christopher
Geris Ryan
Winger Lyall
Bereskin & Parr LLP / S.E.N.C.R.L., s.r.l.
Hancock Dennis
Perkey W. B.
Research In Motion Limited
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