| 摘要 |
<p>The three point force sensing system includes three spaced sensor members (40, 42, 44) which change in resistance linearly or monotonically over a selected range of force applied thereto. The sensor members are arranged in a triangle configuration in a flex circuit which is positioned between a brushhead and a brushhead body. The brushhead has three raised portions (76, 78 80) on a lower surface thereof which bear against the sensor members in a spring-like relationship. Electrically conductive trace lines extend from the sensor members along the length of the toothbrush to a connector at the rear end thereof. A microprocessor is used to evaluate the change of resistance as force is applied against the brushhead to determine force in the z direction against the teeth, as well as motion in the x and y direction in a plane parallel with a base portion of the brushhead.</p> |
