Photography – With object illumination for exposure – With power supply detail
Patent
1999-02-11
2000-06-27
Adams, Russell
Photography
With object illumination for exposure
With power supply detail
396301, G03B 726
Patent
active
060816732
ABSTRACT:
A camera control circuit is provided which is capable of carrying out a control operation under a required high voltage even in the case of using a low withstand voltage circuit element which is capable of operating at a high speed and a low power consumption. A CPU comprises of an I/O section which is capable of operating in a predetermined supply voltage range and a core section which is capable of operating in a predetermined supply voltage range having an upper limit value lower than the I/O section, and outputs a control instruction so as to control peripheral circuits. On the basis of the control instruction, a voltage-up circuit increases a supply voltage of a battery in a supply voltage range enabling the I/O section to operate so as to set as a first supply voltage, and then, supplies the first supply voltage to the I/O section. On the other hand, a regulator included in an interface IC decreases the first supply voltage for a predetermined period in a supply voltage range enabling the core section to operate so as to set as a second supply voltage, and then, supplies the second supply voltage to the core section.
REFERENCES:
patent: 5365305 (1994-11-01), Seki et al.
patent: 5389998 (1995-02-01), Dunsmore et al.
patent: 5640624 (1997-06-01), Lee
patent: 5809315 (1994-11-01), Ohtsuka
patent: 5832324 (1998-11-01), Shimizu et al.
Adams Russell
Olympus Optical Co,. Ltd.
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