Hewlett-packard Company

Hewlett-packard Development Company, L.P.

B Mark Hirst

Mark John Wibbels

Kenneth Eugene Heath

Winthrop D Childers

Michael L Bullock

K Trent Christensen

Antoni Gil Miquel

Ronald D Stephens, Jr

David J Arcaro

Wayne E Foote

Gerard Joseph Carlson

Tony Barrett

Andrew J Binder

A snubber circuit comprises a first energy storage device and circuitry coupled to the first energy storage device to facilitate capturing, by the first energy storage device, energy of a switching circuit. The snubber circuit also comprises a second energy storage device coupled to the first energy storage device to store the captured energy. The circuitry additionally facilitates resetting of the first energy storage device.

Snubber circuit

Peripheral devices that have their own power sources. In one embodiment, a peripheral device comprises a processing device, memory, and a power circuit configured to supply power to a peripheral device component, the power circuit including a power source.

Peripheral device having a power supply

A method for refining a length of a scan line, where the scan line is produced from a facet of a scanning device. The method includes the steps of: (a) acquiring a plurality of scan line lengths produced from the facet, (b) determining from the plurality of scan line lengths, an average scan line length for the facet, and (c) determining from the average scan line length, a scan line length correction for the facet. A method for measuring a length of a scan line includes the steps of: (a) charging an electrical current integrator to a voltage while a scan line is produced from a facet, (b) measuring the voltage, and (c) determining from the voltage, the length of the scan line produced from the facet.

Characterization of a scan line produced from a facet of a scanning device

Scanning assemblies, printing devices, and related methods are described. In one embodiment, pole pieces are configured to be coupled with an input voltage source that can produce phase-shifted input voltages, the pole pieces defining at least first and second phases. A rotor is operably associated with the pole pieces for rotation. The pole pieces and the rotor are configured as an induction drive system in which a rotational force for rotating the rotor is produced through interaction of rotor-induced eddy currents from each of the first and second phases with respective magnetic fluxes of the other of the first and second phases.

Scanning assemblies, printing devices, and related methods

The present disclosure relates to a fusing system for fusing toner to a recording medium. The system includes a fuser roller, a pressure roller in contact with the fuser roller, and an external heating roller. In addition, the disclosure relates to a method for heating a fuser roller of a fusing system. The method includes the steps of providing an external heating roller, contacting an outer surface of the fuser roller with the external heating roller, heating the external heating roller, and rotating the external heating roller and the fuser roller such that heat is transferred from the external heating roller to the fuser roller.

Fusing system including an external heater

Disclosed are systems and methods for managing power in an imaging device. In one embodiment, a system and a method pertain to operating multiple heating elements in a temporally-shifted manner to create an effective drive frequency that exceeds an actual drive frequency at which the heating elements are actually driven.

System and method for controlling power in an imaging device

The present disclosure relates to a fusing system for fusing toner to a recording medium. The fusing system includes a fuser roller including a metal layer, a pressure roller in contact with the fuser roller, and an external induction heating element. In addition, the disclosure relates to a method for heating a fuser roller of a fusing system including the steps of positioning an external induction heating element in close proximity to the outer surface of the fuser roller, delivering high frequency current to a coil of the external induction heating element to create a magnetic flux, and directing the magnetic flux toward the fuser roller so as to induce eddy currents within a metal layer of the fuser roller that generate heat within the roller.

Fusing system having electromagnetic heating

A means for determining the voltage of a power source is disclosed. A portion of the available power from the power source is applied to a heating element. By measuring a rate of change in the temperature of the heating element the input voltage can be determined.

Use of the temperature gradient to determine the source voltage

A method for determining a scan line error for a scan line, wherein the scan line is produced from one of a plurality of facets of a rotating reflector of a scanning device. The method comprises the steps of (a) determining a difference between a time of an occurrence of a point in a scan line produced from a first facet and a time of an occurrence of a point in a scan line produced from a second facet, and (b) determining from the difference, a scan line error for the scan line produced from the first facet.

Measurement and correction of a scan line length error

The present disclosure relates to a fusing system for fusing toner to a recording medium. In one embodiment, the fusing system contains a fuser roller configured as a heat pipe including an inner tube and a coaxial outer tube that is mounted to the inner tube, the inner and outer tubes defining an interior space therebetween that is adapted to contain a liquid and to be evacuated so as be maintained in a vacuum, and a pressure roller in contact with the fuser roller. In another embodiment, the fusing system contains a fuser roller, a pressure roller in contact with the fuser roller, and an external heating roller in contact with the fuser roller, the external heating roller being configured as a heat pipe including an inner tube and a coaxial outer tube that is mounted to the inner tube, the inner and outer tubes defining an interior space therebetween that is adapted to contain a liquid and to be evacuated so as be maintained in a vacuum.

Fusing system including a heat distribution mechanism

The present invention provides a synchronous full-wave AC rectifier connectable to an AC voltage source. In one embodiment, the synchronous rectifier includes a full-wave diode bridge having four bridge diodes. A power switch is coupled in parallel with each bridge diode, and each power switch has a power switch control gate. A power switch control circuit is coupled in parallel with each bridge diode. Each power switch control circuit provides a first control voltage to its associated power switch control gate to cause the power switch to turn on when the parallel-connected bridge diode is forward biased. Each power switch control circuit provides a second control voltage to its associated power switch control gate to cause the power switch to turn off when the parallel-connect bridge diode is reverse biased. The power switch control circuits turn their associated power switches on and off synchronously with the AC voltage source to provide the full-wave rectified AC output.

Synchronous bridge rectifier

The present disclosure relates to a fusing system for fusing toner to a recording medium. The fusing system includes a fuser roller including an elastomeric layer and a heat transport layer disposed around the elastomeric layer, the heat transport layer having high thermal capacity, and a pressure roller in contact with the fuser roller. The present disclosure also relates to a fusing method that helps reduce gloss variation of printed media fused to a recording medium with a fusing system. The method includes the steps of forming a heat transport layer having high thermal capacity at an outer surface of a fuser roller of the fusing system, heating the heat transport layer, and transferring heat from the heat transport layer to the recording medium as it passes through a nip of the fusing system.

Fusing system including a heat storage mechanism

The present disclosure relates to a fusing system for fusing toner to a recording medium. The fusing system comprises a fuser roller that does not have an internal heat source, a pressure roller that does not have an internal heat source, the pressure roller being in contact with the fuser roller, and an external heat source that heats at least one of the fuser and pressure rollers.

Simplified fusing system

A DC power supply is disclosed. In one aspect, the DC power supply is a DC bias supply connectable to an AC source. The supply includes a first and second input node connectable to the AC source. A pump capacitor is provided having a first terminal coupled to the first input node and having a second terminal. A pump circuit is coupled between the second terminal of the pump capacitor and the second input node and having first and second output nodes. A storage capacitor is coupled between the output nodes, wherein during a first half-cycle of the AC source the pump circuit causes the pump capacitor accumulate a charge and during a second half-cycle of the AC source the pump circuit causes the pump capacitor to transfer to the storage capacitor the accumulated charge, thereby providing a rectified AC output voltage between the output nodes.

Growing community of inventors

Boise, ID, United States of America

B Mark Hirst