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US 5,229,577 AGranted
Image forming apparatus utilizing an AC voltage control circuit
AssigneeFuji Xerox Co., Ltd.
InventorsTomoyuki Matsuura, Hideki Furuta
Life of this patent
Estimating the term…
Abstract
An image forming apparatus having a built in AC voltage control circuit which enables the apparatus to be used in regions of the world having commercial power supplies with different supply voltages. The AC voltage control circuit first compares the input voltage to a reference voltage and then performs a switching operation to ensure that the voltage supplied to the AC electric components of the image forming apparatus is the voltage necessary for operation of those components.
Claims16
An image forming apparatus having DC components comprising:
- a low voltage DC power source for connection to an AC in voltage source to energize the DC components, said low voltage power source including voltage comparing means for comparing AC input voltage from the AC input voltage source to a predetermined reference voltage;
- an AC electric component which operates on an applied AC voltage;
- and
- voltage applying means for applying said input AC voltage to said AC electric component in response to a signal from said voltage comparing means indicative of said AC input voltage being lower than said reference voltage, and for applying a converter voltage from said AC input voltage having a value substantially equal to one half of said AC input voltage in response to a signal from said voltage comparing means indicative of said AC input voltage being higher than said reference voltage.
1 more element
An image forming apparatus having DC components, comprising:
- a low voltage DC power source for connection to an AC input voltage source to energize the DC components, said low voltage DC power source including voltage comparing means for comparing an AC input voltage from the AC input voltage source to a predetermined reference voltage;
- a fusing unit having a pair of substantially identical heaters which operate on an applied AC voltage;
- and
- connection control means for connecting said pair of heaters in parallel in response to a signal received from said voltage comparing means indicative of said AC input voltage being lower than said reference voltage, and connecting said pair of heaters in series in a response to a signal received from said voltage comparing means indicative of said AC input voltage being higher than said reference voltage.
1 more element
A laser printer having DC components comprising:
- a low voltage DC power source for connection to an AC input voltage source to engage the DC components, said low voltage DC power source including voltage comparing means for comparing an AC input voltage from the AC input voltage source to a predetermined reference voltage;
- an AC electric component which operates on an applied AC voltage;
- and
- voltage applying means for coupling said input AC voltage to said AC electric component in response to a signal received from said voltage comparing means indicative of said AC input voltage being lower than said reference voltage, and coupling a converted voltage from said AC input voltage having a value substantially equal to one half of said AC input voltage in response to a signal received from said voltage comparing means indicative of said AC input voltage being higher than said reference voltage.
1 more element
A laser printer having DC components comprising:
- a low voltage DC power source for connection to an AC input voltage source to energize the DC components, said low voltage DC power source including voltage comparing means for comparing an AC input voltage to a predetermined reference voltage;
- a pair of substantially identical heaters which operate on an applied AC voltage;
- and
- connection control means for connecting said pair of heaters in parallel in response to a signal received from said voltage comparing means indicative of said AC input voltage being lower than said reference voltage, and connecting said pair of heaters in series in response to a signal received from said voltage comparing means indicative of said AC input voltage being higher than said reference voltage.
1 more element
Dependencies are inferred from the claim text.