Sheet size detector and image processing apparatus
First Claim
1. A sheet size detector to detect a sheet size of a recording medium, the sheet size detector comprising:
- a movable member configured to move in a sheet size detection direction to a position corresponding to the sheet size;
a magnetic flux detector including a coil disposed on a board face parallel to the sheet size detection direction, the coil configured to generate a magnetic flux in a direction perpendicular to the board face, the magnetic flux detector configured to output a signal corresponding to changes in magnetic flux in the direction perpendicular to the board face, the signal corresponding to the position of the movable member; and
a target configured to oppose the board face and including a material to affect the magnetic flux, a size of the target changing in the sheet size detection direction to change the magnetic flux in the direction perpendicular to the board face according to movements of the movable member such that an oscillation frequency of the magnetic flux detector continuously increases as the movable member moves in the sheet size detection direction or continuously decreases as the movable member moves in the sheet size detection direction.
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Accused Products
Abstract
A sheet size detector to detect a sheet size of a recording medium includes a movable member to move in a sheet size detection direction to a position corresponding to the sheet size, a magnetic flux detector including a coil disposed on a board face parallel to the sheet size detection direction to generate a magnetic flux in a direction perpendicular to the board face, and a target to oppose the board face and including a material to affect the magnetic flux. The target is different in configuration in the sheet size detection direction to change the magnetic flux in the direction perpendicular to the board face as the movable member moves. The magnetic flux detector outputs a signal corresponding to changes in magnetic flux in the direction perpendicular to the board face, and the signal corresponds to the position of the movable member.
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Citations
19 Claims
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1. A sheet size detector to detect a sheet size of a recording medium, the sheet size detector comprising:
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a movable member configured to move in a sheet size detection direction to a position corresponding to the sheet size; a magnetic flux detector including a coil disposed on a board face parallel to the sheet size detection direction, the coil configured to generate a magnetic flux in a direction perpendicular to the board face, the magnetic flux detector configured to output a signal corresponding to changes in magnetic flux in the direction perpendicular to the board face, the signal corresponding to the position of the movable member; and a target configured to oppose the board face and including a material to affect the magnetic flux, a size of the target changing in the sheet size detection direction to change the magnetic flux in the direction perpendicular to the board face according to movements of the movable member such that an oscillation frequency of the magnetic flux detector continuously increases as the movable member moves in the sheet size detection direction or continuously decreases as the movable member moves in the sheet size detection direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An image processing apparatus comprising:
a sheet size detector to detect a sheet size of a recording medium, the sheet size detector including a movable member configured to move in a sheet size detection direction to a position corresponding to the sheet size, a magnetic flux detector including a coil disposed on a board face parallel to the sheet size detection direction, the coil configured to generate a magnetic flux in a direction perpendicular to the board face, the magnetic flux detector configured to output a signal corresponding to changes in magnetic flux in the direction perpendicular to the board face, the signal corresponding to the position of the movable member, and a target configured to oppose the board face and including a material to affect the magnetic flux, a size of the target changing in the sheet size detection direction to change the magnetic flux in the direction perpendicular to the board face according to movement of the movable member such that an oscillation frequency of the magnetic flux detector continuously increases as the movable member moves in the sheet size detection direction or continuously decreases as the movable member moves in the sheet size detection direction. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A sheet size detector to detect a sheet size of a recording medium, the sheet size detector comprising:
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a movable member configured to move in a sheet size detection direction to a position corresponding to the sheet size; a magnetic flux detector including a planar coil and a planar resistor, the planar coil disposed on a board face parallel to the sheet size detection direction, and the planar resistor patterned on the board face, the planar coil configured to generate a magnetic flux in a direction perpendicular to the board face, the magnetic flux detector configured to output a signal corresponding to changes in magnetic flux in the direction perpendicular to the board face, the signal corresponding to the position of the movable member; and a target configured to oppose the board face and including a material to affect the magnetic flux, a size of the target changing in the sheet size detection direction to change the magnetic flux in the direction perpendicular to the board face according to movements of the movable member such that an oscillation frequency of the magnetic flux detector continuously increases as the movable member moves in the sheet size detection direction or continuously decreases as the movable member moves in the sheet size detection direction.
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Specification