Image forming apparatus and image forming method
US-2015277317-A1 · Oct 1, 2015 · US
Image forming apparatus
US11550246B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11550246-B2 |
| Application number | US-202117458853-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 27, 2021 |
| Priority date | Sep 17, 2020 |
| Publication date | Jan 10, 2023 |
| Grant date | Jan 10, 2023 |
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- Title
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Abstract
Official abstract text for this publication.
An image forming apparatus includes a fixing device and circuitry. The fixing device includes a fixing rotator, an electromagnetic induction heater configured to heat the fixing rotator, and a magnetic flux control member. The circuitry is configured to control the electromagnetic induction heater to lead a temperature of the fixing rotator to a target temperature and change an upper limit of power supplied to the electromagnetic induction heater based on the target temperature.
First claim
Opening claim text (preview).
What is claimed is: 1. An image forming apparatus comprising: a fixing device including a fixing rotator, an electromagnetic induction heater configured to heat the fixing rotator, and a magnetic flux control member; and circuitry configured to, control the electromagnetic induction heater to lead a temperature of the fixing rotator to a target temperature, and change an upper limit of power supplied to the electromagnetic induction heater, based on the target temperature by selecting the upper limit of the power corresponding to the target temperature from among a plurality of upper limits of the power corresponding to respective ones of a plurality of target temperatures such that the upper limit of the power that is selected is smaller than another one of the plurality of upper limits of the power corresponding to another one of the plurality of target temperatures lower than the target temperature. 2. The image forming apparatus according to claim 1 , further comprising: a temperature detection sensor configured to detect the temperature of the fixing rotator, wherein the circuitry is configured to change the power supplied to the electromagnetic induction heater, based on the target temperature and a temperature detected by the temperature detection sensor. 3. The image forming apparatus according to claim 1 , wherein the circuitry comprises: a memory configured to store the plurality of target temperatures, including the target temperature, and the plurality of upper limits of the power corresponding to the plurality of target temperatures. 4. The image forming apparatus according to claim 1 , wherein the circuitry is configured to set the target temperature based on a type of a sheet passing through the fixing device. 5. The image forming apparatus according to claim 1 , wherein the circuitry is configured to set the target temperature based on a velocity of a sheet passing through the fixing device. 6. The image forming apparatus according to claim 1 , wherein the circuitry is configured to perform a pulse-width modulation control and change an upper limit of a pulse width controlled by the pulse-width modulation control to change the upper limit of the power. 7. The image forming apparatus of claim 1 , wherein the fixing rotator is wound about a heat generator, the heat generator being made of a magnetic shunt alloy, wherein the magnetic flux control member is inside the heat generator.
Assignees
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Classifications
- G03G15/2039Primary
with means for controlling the fixing temperature · CPC title
relating to the chemical composition of the heat element and layers thereof · CPC title
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- What does patent US11550246B2 cover?
- An image forming apparatus includes a fixing device and circuitry. The fixing device includes a fixing rotator, an electromagnetic induction heater configured to heat the fixing rotator, and a magnetic flux control member. The circuitry is configured to control the electromagnetic induction heater to lead a temperature of the fixing rotator to a target temperature and change an upper limit of p…
- Who is the assignee on this patent?
- Amita Akiyasu, Tokuda Tetsuo, Ujiie Masateru, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification G03G15/2039. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 10 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).