Keyboard device
First Claim
1. A keyboard device comprising:
- a keyboard chassis;
a key provided on the keyboard chassis in a manner to be rotatable in a vertical direction;
a hammer member for applying an action load to the key by rotating to be displaced in response to depression of the key; and
an elastic section provided in at least one of either the hammer member or the key, which is elastically deformed in response to the depression of the key;
wherein the keyboard device is configured such that, when considered as a mechanical oscillation system model where L represents a distance in a horizontal direction from a rotation support of the hammer member to a contact point at which the key comes into contact with the hammer member, I represents a moment of inertia around the rotation support of the hammer member, and K represents an elastic modulus in a vertical direction of the elastic section in at least one of either the hammer member or the key, in an initial state in which the key has not been depressed, a relationship of the distance L in the horizontal direction, the moment of inertia I, and the elastic modulus K is set to (2/π
)2·
K·
10−
4≦
(I/L2)≦
4·
(2/π
)2·
K·
10−
4, and a timing at which the action load applied to the key by the hammer member in response to the depression of the key reaches a maximum is delayed by a predetermined amount of time.
1 Assignment
0 Petitions
Accused Products
Abstract
A keyboard device configured such that, when L represents a distance in a horizontal direction from a rotation support of a hammer member 3 to a contact point where a key 2 comes into contact with an elastic section 23 of the hammer member 3, I represents a moment of inertia around the rotation support, and K represents an elastic modulus in a vertical direction of the elastic section 23 coming into contact with the key 2, the relationship of L, I and K is set to (2/π)2·K·10−4≦(I/L2)≦4·(2/π)2·K·10−4. Accordingly, when the key 2 is depressed, a timing at which an action load applied to the key 2 by the hammer member 3 reaches its maximum is delayed by 10-20 milliseconds from the start of the depression, whereby the maximum action load can be applied at a timing that gives a key-touch feel close to that of an acoustic piano.
-
Citations
6 Claims
-
1. A keyboard device comprising:
-
a keyboard chassis; a key provided on the keyboard chassis in a manner to be rotatable in a vertical direction; a hammer member for applying an action load to the key by rotating to be displaced in response to depression of the key; and an elastic section provided in at least one of either the hammer member or the key, which is elastically deformed in response to the depression of the key; wherein the keyboard device is configured such that, when considered as a mechanical oscillation system model where L represents a distance in a horizontal direction from a rotation support of the hammer member to a contact point at which the key comes into contact with the hammer member, I represents a moment of inertia around the rotation support of the hammer member, and K represents an elastic modulus in a vertical direction of the elastic section in at least one of either the hammer member or the key, in an initial state in which the key has not been depressed, a relationship of the distance L in the horizontal direction, the moment of inertia I, and the elastic modulus K is set to (2/π
)2·
K·
10−
4≦
(I/L2)≦
4·
(2/π
)2·
K·
10−
4, and a timing at which the action load applied to the key by the hammer member in response to the depression of the key reaches a maximum is delayed by a predetermined amount of time. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification
-
- Resources
-
Current AssigneeCasio Computer Company Limited
-
Original AssigneeCasio Computer Company Limited
-
InventorsKamimura, Norizo
-
Primary Examiner(s)LOCKETT, KIMBERLY R
-
Application NumberUS12/822,547Publication NumberTime in Patent Office537 DaysField of Search844/23.R, 84/7, 84/20, 84/21, 84 25- 29, 84/33, 84/34, 841/74, 84236-238US Class Current84/423.RCPC Class CodesG10C 3/12 Keyboards; Keys
