Back to results
US 2018/0103142 A1Published application
Image forming apparatus to which noise counter-measure is applied
AssigneeCanon Kabushiki Kaisha
InventorsTeruhiko SUZUKI, Masahiro SHINOTSUKA, Kazunori MIYAKE
Life of this patent
Estimating the term…
Abstract
An image forming apparatus may have the followings. A switching transformer has a first coil, a second coil, and a first core. The switching transformer generates a secondary side current in the second coil by a magnetic flux generated in the first core by a current that flows in the first coil. A common mode choke coil has a third coil, a fourth coil, and a second core. The common mode choke coil reduces a common mode noise. The switching transformer and the common mode choke coil are mounted on a substrate so that a direction of the magnetic flux generated in the first core and a direction of a magnetic flux generated in the second core are perpendicular.
Claims14
An image forming apparatus comprising:
- a switching transformer that has a first coil, a second coil, and a first core, the first coil and the second coil being wound around the first core, the switching transformer configured to generate a secondary side current in the second coil by a magnetic flux generated in the first core by a current that flows in the first coil;
- and
- a common mode choke coil that has a third coil, a fourth coil, and a second core, the third coil and the fourth coil being wound around the second core, the common mode choke coil configured to reduce a common mode noise;
- wherein the switching transformer and the common mode choke coil are mounted on a substrate so that a direction of the magnetic flux generated in the first core and a direction of a magnetic flux generated in the second core are perpendicular.
1 more element
An image forming apparatus comprising:
- a switching transformer that has a first coil, a second coil, and a first core, the first coil and the second coil being wound around the first core, the switching transformer configured to generate a secondary side current in the second coil by a magnetic flux generated in the first core by a current that flows in the first coil;
- and
- a common mode choke coil that has a third coil, a fourth coil, and a second core, the third coil and the fourth coil being wound around the second core, the common mode choke coil configured to reduce a common mode noise;
- wherein the first core and the second core are separated and a core surface of the first core and a core surface of the second core are inclined so that a noise current, which is generated in the common mode choke coil by magnetic flux that leaks to the outside of the first core out of the magnetic flux generated in the first core passing through the second core, becomes a predetermined regulation value or less.
1 more element
An image forming apparatus comprising:
- a direct current power supply configured to convert an alternating-current voltage supplied from a commercial alternating current power supply into a direct-current voltage;
- a facsimile control unit having a common mode choke coil and an interface circuit connected via the common mode choke coil to a communication line network, the facsimile control unit configured to perform a facsimile communication with a communication device connected via the communication line network;
- and
- an image forming unit configured to operate by a direct-current voltage supplied by the direct current power supply and form an image on the basis of image data received by the facsimile control unit,
- wherein the direct current power supply has
- a switching transformer that has a first coil, a second coil, and a first core, the first coil and the second coil being wound around the first core, the switching transformer configured to generate a secondary side current in the second coil by a magnetic flux generated in the first core by a current that flows in the first coil;
- a switching element configured to switch a primary alternating-current voltage applied to the first coil;
- and
- a rectification smoothing circuit configured to rectify and smooth a secondary alternating-current voltage outputted from the second coil when the primary alternating-current voltage which is applied to the first coil in the switching transformer is converted,
- wherein the common mode choke coil has a third coil, a fourth coil, and a second core, the third coil and the fourth coil being wound around the second core, and the common mode choke coil configured to reduce common mode noise, and
- the switching transformer and the common mode choke coil are mounted on the same or different substrates so that a direction of the magnetic flux generated in the first core and a direction of a magnetic flux generated in the second core are perpendicular.
8 more elements
Dependencies are inferred from the claim text.