Image forming device and method

Patent metadata

Field	Value
Publication number	US-2017227902-A1
Application number	US-201515515250-A
Country	US
Kind code	A1
Filing date	Oct 23, 2015
Priority date	Oct 23, 2014
Publication date	Aug 10, 2017
Grant date	—

Abstract

Provided are an apparatus and a method of detecting an error in the apparatus. The apparatus includes an image former and an induction heating fusing device. The image former forms an image. The induction heating fusing device fuses the image formed by the image former onto paper. Whether the apparatus has an error is determined by limiting a current applied to a resonance circuit included in the induction heating fusing device to less than a certain level.

First claim

1 . An image forming apparatus, comprising:
an image former that forms an image on printing paper; and an induction heating fusing device that fuses the image onto the printing paper and comprises:
a resonance circuit comprising an inductor that is inductively heated by a current to generate fusing heat;
a driver circuit that applies a current to the resonance circuit; and
a controller configured to drive the driver circuit in an A-mode in which a fusing operation is performed, and to determine whether the apparatus has an error in a B-mode in which magnitude of the current applied to the resonance circuit by the driver circuit is limited to less than a preset level.

2 . The apparatus of claim 1 , wherein
the controller is configured to drive the driver circuit in the A-mode when it is determined in the B-mode that the apparatus does not have an error.

3 . The apparatus of claim 1 , wherein
the driver circuit is supplied with power from different power sources respectively in the A-mode and the B-mode.

4 . The apparatus of claim 1 , wherein
the driver circuit comprises a first driver circuit and a second driver circuit, the first driver circuit is driven in the A-mode, and the second driver circuit is driven in the B-mode.

5 . The apparatus of claim 4 , wherein
the driver circuit is alternatively electrically connected to the first driver circuit in the A-mode and the second driver circuit in the B-mode.

6 . The apparatus of claim 4 , wherein
the first driver circuit is electrically separated from the second driver circuit, the first driver circuit is electrically open in the B-mode, and the second driver circuit is electrically open in the A-mode.

7 . The apparatus of claim 1 , wherein
the controller is configured to determine whether the apparatus has an error based on a power consumption value of at least one of the resonance circuit and the driver circuit.

8 . The apparatus of claim 7 , wherein
the driver circuit is driven in the B-mode based on a first frequency and a second frequency, and the power consumption value comprises:
a first power consumption value that is estimated when the driver circuit is driven at the first frequency; and a second power consumption value that is estimated when the driver circuit is driven at the second frequency.

9 . The apparatus of claim 8 , wherein
the controller is configured to determine whether the apparatus has an error based on an inclination measured based on the first frequency, the first power consumption value, the second frequency, and the second power consumption value.

10 . The apparatus of claim 8 , wherein
the driver circuit is driven in the A-mode at a driving frequency within a predetermined range, and the first frequency and the second frequency is within the predetermined range.

11 . The apparatus of claim 1 , wherein
the controller is configured to determine whether the apparatus has an error based on a phase of a current in the resonance circuit.

12 . The apparatus of claim 11 , wherein
the phase of the current in the driver circuit is detected periodically based on a clock of the controller.

13 . The apparatus of claim 1 , wherein
the controller is further configured to determine whether the apparatus has an error in the A-mode, and to stop driving the driver circuit in the A-mode when it is determined that the apparatus has an error.

14 . The apparatus of claim 13 , wherein
the controller is configured to drive the driver circuit in the B-mode to determine whether the apparatus has an error when the controller stops driving the driver circuit in the A-mode.

15 . The apparatus of claim 1 , wherein
a driving frequency of the driver circuit in the A-mode is determined based on a power consumption value of at least one of the resonance circuit and the driver circuit.

16 . The apparatus of claim 1 , wherein
a driving frequency of the driver circuit in the A-mode is determined based on a phase of a current in the resonance circuit.

17 . A method performed by an image forming apparatus, the image forming apparatus comprising:
an image former that forms an image on printing paper; and an induction heating fusing device that fuses the image onto the printing paper and comprises:
a resonance circuit comprising an inductor that is inductively heated by a current to generate fusing heat; and
a driver circuit that applies a current to the resonance circuit, wherein the method comprises:
determining whether the apparatus has an error in a B-mode in which magnitude of the current applied to the resonance circuit by the driver circuit is limited to less than a preset level; and
driving the driver circuit in an A-mode in which a fusing operation is performed when it is determined that the apparatus does not have an error in the B-mode.

18 . The method of claim 17 , wherein
the driver circuit comprises a first driver circuit and a second driver circuit, the first driver circuit is driven in the A-mode, and the second driver circuit is driven in the B-mode.

19 . The method of claim 17 , wherein the determining comprises:
determining whether the apparatus has an error based on a power consumption value of at least one of the resonance circuit and the driver circuit.

20 . The method of claim 17 , wherein the determining comprises:
determining whether the apparatus has an error based on a phase of a current in the resonance circuit.

Assignees

• S Printing Solution Co Ltd

Inventors

• Tomishima Yuichiro

Classifications

• G03G15/55

  Self-diagnostics; Malfunction or lifetime display · CPC title

• H02M1/088

  for the simultaneous control of series or parallel connected semiconductor devices · CPC title

• G03G15/80

  Details relating to power supplies, circuits boards, electrical connections · CPC title

• G03G15/2053 Primary

  Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating · CPC title

• G03G15/2039 Primary

  with means for controlling the fixing temperature · CPC title