Patent ID: 7816600

Claim:
An electronic keyboard, comprising: a plurality of keys including at least a first key and a second key; a first key support supporting the first key for movement between a rest position and a depressed position, and a second key support supporting the second key through movement between a rest position and a depressed position; a first key return spring including a constant force spring, configured to apply a return force to the first key to bias the first key toward the rest position of the first key, wherein the first key return spring is configured such that the return force has a substantially constant magnitude throughout the movement of the first key between the rest position and the depressed position of the first key; and a second key return spring configured to apply a return force to the second key to bias the second key toward the rest position of the second key, wherein the second key return spring is configured such that the return force of the second key return spring has a substantially constant magnitude throughout the movement of the second key between the rest position and the depressed position of the second key; wherein the first key return spring and the second key return spring are configured to apply substantially the same constant force to the first key and the second key, respectively.