Image forming apparatus
First Claim
1. An image forming apparatus comprising:
- a plurality of image forming units configured to respectively form an image;
a plurality of voltage generation units configured to respectively generate voltages for driving the plurality of image forming units,wherein each of the plurality of voltage generation units comprises;
a voltage generator having a transformer, configured to generate a voltage by a switching operation that is driven by changing an input voltage of primary side of the transformer;
a clock generation unit configured to generate a clock signal of a frequency that becomes a reference frequency of the switching operation;
a setting unit configured to set the frequency of the clock signal that the clock generation unit generates; and
a control unit configured to control so that the frequencies of the clock signals are set by the setting unit to values that are different from each other when the image forming apparatus is in image forming and in a standby state in which the image forming apparatus is waiting for start of image forming.
1 Assignment
0 Petitions
Accused Products
Abstract
An image forming apparatus comprises a plurality of image forming units that respectively form an image, and a plurality of voltage generation circuits that respectively generate voltages for driving the plurality of image forming units. Each of the plurality of voltage generation circuits comprises a voltage generation circuit having a transformer, and generates a voltage by a switching operation that is driven by changing an input voltage of primary side of the transformer, an oscillation circuit that generates a clock signal of a frequency that becomes a reference frequency of the switching operation and a setting unit that sets the frequency of the clock signal that the oscillation circuit generates. The setting units of the plurality of voltage generation circuits set the frequencies of the respective clock signals.
-
Citations
14 Claims
-
1. An image forming apparatus comprising:
-
a plurality of image forming units configured to respectively form an image; a plurality of voltage generation units configured to respectively generate voltages for driving the plurality of image forming units, wherein each of the plurality of voltage generation units comprises; a voltage generator having a transformer, configured to generate a voltage by a switching operation that is driven by changing an input voltage of primary side of the transformer; a clock generation unit configured to generate a clock signal of a frequency that becomes a reference frequency of the switching operation; a setting unit configured to set the frequency of the clock signal that the clock generation unit generates; and a control unit configured to control so that the frequencies of the clock signals are set by the setting unit to values that are different from each other when the image forming apparatus is in image forming and in a standby state in which the image forming apparatus is waiting for start of image forming. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. An image forming apparatus comprising:
-
a plurality of image forming units configured to respectively form an image; and a plurality of voltage generators configured to respectively generate voltages for supplying the plurality of image forming units, wherein each of the plurality of voltage generators comprises; a sinusoidal wave generator configured to generate a sinusoidal wave; a transformer configured to generate a high voltage at a secondary side of the transformer; and a class-D amplifier having a clock generator for generating a clock signal, the class-D amplifier being configured to generate a PWM signal for driving a primary side of the transformer based on the sinusoidal wave generated by the sinusoidal wave generator and the clock signal, wherein the frequencies of the PWM signals generated by the respective class-D amplifiers of the plurality of voltage generators differ from each other so that the PWM signals generated by the respective class-D amplifiers do not synchronize with each other even if a duty of each of the PWM signals generated by the respective class-D amplifiers becomes a same predetermined value. - View Dependent Claims (10, 11, 12, 13, 14)
-
Specification