US 9,285,729 B2Granted

Image forming apparatus including temperature detection processing of a fixing member

AssigneeCanon Kabushiki Kaisha

InventorsHiroshi Saito, Kenichi Tanaka

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Abstract

An image forming apparatus includes a fixing unit having a heater, and a fixing member, the fixing unit configured to fix an image onto a recording material, a film configured to increase its temperature by absorbing infrared rays, a first sensor configured to measure a temperature of the film, a holding member configured to hold the film, a second sensor configured to measure a temperature of the holding member, a storage unit for storing a plurality of temperature determination information, a selection unit configured to select temperature determination information to interest, based on the measurement results of the first and the second sensor, from among the plurality of the stored temperature determination information, and a determination unit configured to determine a temperature of the fixing unit using the temperature determination information to interest selected by the selection unit, based on the measurement results of the first and the second sensor.

Claims17

Dependent claims

An image forming apparatus comprising:

a fixing unit having a heater, and a fixing member configured to be heated by the heater, the fixing unit configured to heat a recording material bearing an image using the fixing member so that the image is fixed on the recording material;
a film provided in non-contact with the fixing member, the film configured to increase its temperature by absorbing infrared rays emitted from the fixing member;
a first sensor configured to measure a temperature of the film;
a holding member configured to hold the film;
a second sensor configured to measure a temperature of the holding member;
a storage unit for storing corresponding relations among information about measurement results of the first sensor and measurement results of the second sensor, and the temperature of the fixing member, as a plurality of temperature determination information wherein the plurality of temperature determination information has the different corresponding relations;
a selection unit configured to select temperature determination information to interest, based on the measurement results of the first sensor and the measurement results of the second sensor, from among the plurality of the temperature determination information stored in the storage unit;
and
a determination unit configured to determine a temperature of the fixing member using the temperature determination information to interest selected by the selection unit, based on the measurement results of the first sensor and the measurement results of the second sensor.

6 more elements

An image forming apparatus comprising:

an image forming unit configured to form an image on a recording material;
a fixing unit including a heating portion configured to heat the image formed on the recording material, configured to fix the image onto the recording material by using the heating portion;
a film arranged by not being in contact with the heating portion, configured to increase a temperature thereof by absorbing infrared rays emitted from the heating portion;
a first sensor configured to measure a temperature of the film;
a case disposed by not being in contact with the heating portion and having the film therein;
a second sensor configured to measure a temperature of the case;
a determining unit configured to determine a temperature information of the heating portion according to a measurement result of the first sensor and a measurement result of the second sensor based on a first temperature determination condition in a case where a first temperature corresponding to the measurement result of the first sensor is higher than a second temperature corresponding to the measurement result of the second sensor, and determine a temperature information of the heating portion according to a measurement result of the first sensor and a measurement result of the second sensor based on a second temperature determination condition that is different from the first temperature determination condition in a case where the first temperature is lower than the second temperature;
and
a controller configured to control a temperature of the heating portion based on the temperature information determined by the determining unit.

6 more elements

Dependencies are inferred from the claim text.