IMAGE HEATING APPARATUS

摘要

An image heating apparatus for heating an image formed on a recording material includes a tubular rotary member including a conductive layer, a magnetic core inserted into a hollow portion of the rotary member, a coil helically wound around an outer side of the magnetic core in the hollow portion, and a control unit configured to control a frequency of an alternating current flowing through the coil, in which the conductive layer generates heat by an electromagnetic induction in an alternating magnetic field formed when the alternating current flows through the coil, and the control unit controls the frequency in accordance with a size of the recording material.

主权项

1. An image heating apparatus for heating an image formed on a recording material, the image heating apparatus comprising:
a tubular rotary member including a conductive layer; a magnetic core inserted into a hollow portion of the rotary member; a coil helically wound around an outer side of the magnetic core in the hollow portion, the coil is provided so that a direction of a helical axis of the coil is a direction along a generatrix direction of the rotary member; and a control unit configured to control a frequency of an alternating current flowing through the coil, wherein the conductive layer generates heat by an electromagnetic induction in an alternating magnetic field formed when the alternating current flows through the coil, and wherein the control unit controls the frequency in accordance with a size of the recording material.