KEYBOARD DEVICE FOR ELECTRONIC KEYBOARD INSTRUMENT
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United States of America Patent
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Issued Date -
Aug 20, 2020
app pub date -
Feb 6, 2020
filing date -
Feb 19, 2019
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Abstract
A pressing surface of a hammer and a to-be-pressed surface of a key switch have relatively-concaved shapes in a longitudinal direction of the hammer. When a switch body is pressed by the hammer, an inclination caused by an overall curvature of the switch body that results from the fact that the switch body is pressed by the hammer from an oblique direction is canceled by an inclination of the switch body caused by partial compression and deformation that results from the relatively-concaved shapes, so that movable contacts in the switch body frontally face stationary contacts and come into contact with the stationary contacts, respectively.
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