Image forming apparatus

Patent metadata

Field	Value
Publication number	US-9429909-B2
Application number	US-201414579211-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 25, 2013
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

An image forming apparatus includes a heat-generating component, a power generation device including a thermoelectric element, a heat radiation device, a cooling device, a temperature detector that detects a temperature increase of the heat-generating component, and a controller. The heat radiation device includes a first radiator plate interposed between the heat-generating component and a surface of the thermoelectric element and a second radiator plate attached to another surface of the thermoelectric element. The cooling device cools the first radiator plate. The controller controls operations of the cooling device and the power generation device by operating the cooling device if the detected temperature increase reaches at least a predetermined threshold value, and causing the power generation device to generate power without operating the cooling device to cool the first radiator plate passively if the detected temperature increase falls below the predetermined threshold value.

First claim

What is claimed is:

1. An image forming apparatus comprising:
a heat-generating component;
a power generation device including a thermoelectric element;
a heat radiation device including a first radiator plate interposed between the heat-generating component and a first surface of the thermoelectric element and a second radiator plate attached to a second surface of the thermoelectric element opposite the first surface;
a cooling device configured to cool the first radiator plate;
a temperature detector configured to detect a temperature increase of the heat-generating component; and
a controller configured to operate the cooling device to actively cool the first radiator plate if the detected increased temperature reaches at least a threshold value, and stop operating the cooling device to passively cool the first radiator plate through allowing the heat to transmit from the first radiator plate to the second radiator plate via the power generation device if the detected increased temperature falls below the threshold value,
wherein the heat-generating component is a pressure roller,
wherein the pressure roller has a rotary shaft formed of a heat pipe, and
wherein the heat pipe is fixed to the first radiator plate to guide the heat towards the first radiator plate.

2. The image forming apparatus according to claim 1 , wherein the first radiator plate has a thermal conductivity higher than that of the second radiator plate.

3. The image forming apparatus according to claim 1 , wherein the first radiator plate has at least a portion directly facing the cooling device.

4. The image forming apparatus according to claim 1 , wherein the first radiator plate, the thermoelectric element, and the second radiator plate are arranged in consecutive order.

5. The image forming apparatus according to claim 1 , wherein the controller operates the cooling device to directly cool the heat-generating component via the power generation device.

6. The image forming apparatus according to claim 1 , wherein the first radiator plate is fixed to and rotates with the heat-generating component.

7. The image forming apparatus according to claim 1 , wherein the first radiator plate and the second radiator plate are circular in shape.

8. The image forming apparatus according to claim 1 , wherein the thermoelectric element is circular in shape.

9. The image forming apparatus according to claim 8 , wherein the thermoelectric element has a smaller diameter than a diameter of the first radiator plate.

10. The image forming apparatus according to claim 8 , further comprising a pair of electrodes on a circumferential surface of the thermoelectric element.

11. The image forming apparatus according to claim 10 , wherein the pair of electrodes are connected to a direct-current converter (DDC) charger.

12. The image forming apparatus according to claim 1 , wherein the thermoelectric element has a similar shape as the first radiation radiator plate.

13. The image forming apparatus according to claim 1 , wherein the thermoelectric element has a similar shape as the second radiator plate.

14. An image forming apparatus comprising:
a heat-generating component;
a power generation device including a thermoelectric element;
a heat radiation device including a first radiator plate interposed between the heat-generating component and a first surface of the thermoelectric element and a second radiator plate attached to a second surface of the thermoelectric element opposite the first surface;
a cooling device configured to cool the first radiator plate; and
a controller configured to predict a temperature increase of the heat-generating component from a control state of the image forming apparatus related to the temperature increase, and to operate the cooling device to actively cool the first radiator plate if the predicted increased temperature reaches at least a threshold value, and stop operating the cooling device to passively cool the first radiator plate through allowing the heat to transmit from the first radiator plate to the second radiator plate via the power generation device if the predicted increased temperature falls below the threshold value,
wherein the heat-generating component is a pressure roller,
wherein the pressure roller has a rotary shaft formed of a heat pipe, and wherein the heat pipe is fixed to the first radiator plate to guide the heat towards the first radiator plate.

15. The image forming apparatus according to claim 14 , wherein the control state of the image forming apparatus indicates a number of prints to be produced by the image forming apparatus.

16. The image forming apparatus according to claim 14 , wherein the control state of the image forming apparatus indicates a thickness of a sheet to be printed by the image forming apparatus.

17. The image forming apparatus according to claim 14 , wherein the control state of the image forming apparatus indicates a print mode of the image forming apparatus.

18. An image forming apparatus comprising:
a heat-generating component;
a power generation device including a thermoelectric element;
a heat radiation device including a first radiator plate interposed between the heat-generating component and a first surface of the thermoelectric element and a second radiator plate attached to a second surface of the thermoelectric element opposite the first surface;
a cooling device configured to cool the first radiator plate;
a temperature detector configured to detect a temperature increase of the heat-generating component; and
a controller configured to operate the cooling device to actively cool the first radiator plate if the detected increased temperature reaches at least a threshold value, and stop operating the cooling device to passively cool the first radiator plate through allowing the heat to transmit from the first radiator plate to the second radiator plate via the power generation device if the detected increased temperature falls below the threshold value,
wherein the first radiator plate is fixed to and rotates with the heat-generating component.

Assignees

• Shirai Takaaki
• Tao Satoru
• Kasai Takuma
• Okada Norikazu
• Ehara Homare
• Maejima Keita
• Yamashita Tomoyuki
• Kubokawa Ryohta
• Ricoh Co Ltd

Inventors

• Shirai Takaaki
• Tao Satoru
• Kasai Takuma
• Okada Norikazu
• Ehara Homare
• Maejima Keita
• Yamashita Tomoyuki
• Kubokawa Ryohta

Classifications

• G03G15/5004

  Power supply control, e.g. power-saving mode, automatic power turn-off · CPC title

• G03G15/2039

  with means for controlling the fixing temperature · CPC title

• G03G21/206 Primary

  Conducting air through the machine, e.g. for cooling, filtering, removing gases like ozone · CPC title

• G03G15/80

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

• G03G15/2017

  Structural details of the fixing unit in general, e.g. cooling means, heat shielding means (G03G15/2053 takes precedence) · CPC title