Key sheet for pointing device and pointing device
First Claim
1. A key sheet for a pointing device in which a change in magnetic flux density, which occurs as a magnet laterally moves, is detected by at least one magnetic field sensor provided on a printed circuit board, the key sheet comprising a base sheet made of a rubber-like elastic body, comprising:
- a support portion for supporting a magnet;
a flexible portion that is laterally deformable to expand and contract so that the support portion can be laterally moved; and
a directional deformation portion formed in the flexible portion, for guiding and displacing a reverse face of the flexible portion away from a front face of a printed circuit board as the support portion laterally moves.
2 Assignments
0 Petitions
Accused Products
Abstract
Provided is a pointing device that can be reduced in thickness even if a magnetic field sensor is mounted to a front face of a printed circuit board. When a support portion laterally moves, a reverse face of a flexible portion is displaced while being guided away from the printed circuit board due to deformation of a mountain fold flexure portion as a directional deformation portion. Therefore, a clearance between the reverse face of the flexible portion and the printed circuit board increases, and the magnetic field sensor can be mounted to the front face of the printed circuit board, thereby making it possible to reduce thickness of the pointing device. At the same time, the flexible portion would not be ruptured through sliding contact with the magnetic field sensor.
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Citations
20 Claims
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1. A key sheet for a pointing device in which a change in magnetic flux density, which occurs as a magnet laterally moves, is detected by at least one magnetic field sensor provided on a printed circuit board,
the key sheet comprising a base sheet made of a rubber-like elastic body, comprising: -
a support portion for supporting a magnet;
a flexible portion that is laterally deformable to expand and contract so that the support portion can be laterally moved; and
a directional deformation portion formed in the flexible portion, for guiding and displacing a reverse face of the flexible portion away from a front face of a printed circuit board as the support portion laterally moves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pointing device, comprising:
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a magnet;
a base sheet made of a rubber-like elastic body and having a flexible portion that is laterally deformable to expand and contract so that a support portion for supporting the magnet can be laterally moved; and
at least one magnetic field sensor that is provided on a printed circuit board and detects a change in magnetic flux density caused by the magnet moving laterally together with the support portion, wherein the base sheet has a directional deformation portion formed in the flexible portion, which guides and displaces a reverse face of the flexible portion away from a front face of the printed circuit board as the support portion laterally moves. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification