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US 6,147,290 AGranted
Electronic musical instrument keyboard apparatus
AssigneeRoland Corporation
InventorShiro Uno
Life of this patent
Estimating the term…
Abstract
Preferred embodiments include a jack holder 48 that is free to swing in accordance with the depression operation of a key 10, a first elastic member 52 that impels the jack holder 48 and applies the first counter force to the key 10 against the key depression action, the jack 42 that, together with being established so that it is not possible for it to swing with respect to the jack holder 48 during the depression operation of the key 10, is also established so that it is free to swing with respect to the jack holder 48 during the releasing operation of the key 10 and the second elastic member 56 that impels the jack 42 and applies the second counter force, which is smaller than the first counter force, to the key 10 against the key releasing action.
Claims33
An electronic musical instrument keyboard apparatus having a key, wherein the key includes a depressing action and a releasing action comprising:
- a first swingable member that is established so that it can freely swing in accordance with the depressing action of the key;
- a first biasing means that applies a bias to the first swingable member and applies a first counter force to the key that resists the depressing action;
- a second swingable member that is established so that it cannot swing with respect to the first swingable member during the depressing action of the key and, together with this, is established so that it is free to swing with respect to the first swingable member during the releasing action of the key;
- a second biasing means that applies a bias to the second swingable member and applies a second counter force to the key that resists the releasing action and is smaller than the first counter force;
- wherein in accordance with the depressing action of the key, in a portion of the depressing process for the key, the first swingable member and second swingable member swing as a unit against the biasing due to the first biasing means;
- and
- wherein in accordance with the releasing action of the key, in a portion of the releasing process for the key, the second swingable member swings independently against the biasing due to the second biasing means.
4 more elements
An electronic musical instrument keyboard apparatus comprises:
- a swingable member that is established so that it can freely swing in accordance with the depressing action of the key;
- and
- an elastic member that together with applying a bias to the swingable member and applying a first counter force to the key that resists the depressing action, applying a second counter force to the key that resists the releasing action and is smaller than the first counter force;
- wherein
- in accordance with the depressing action of the key, in a portion of the depressing process for the key, the swingable member swings against the first counter force and;
- wherein
- in accordance with the releasing action of the key, in a portion of the releasing process for the key, the swingable member swings against the second counter force.
4 more elements
An electronic musical instrument keyboard apparatus comprising:
- a transmitting member including a depressing action and a releasing action;
- a first swingable member that is established so that it can freely swing in accordance with the depressing action of the transmitting member;
- a first biasing means that applies a bias to the first swingable member and applies a first counter force to the transmitting member that resists the depressing action;
- a second swingable member that is established so that it cannot swing with respect to the transmitting member during the depressing action of the transmitting member and, together with this, is established so that it is free to swing with respect to the transmitting member during releasing action of the transmitting member;
- a second biasing means that applies a bias to the second swingable member and applied a second counter force to the transmitting member that resists the releasing action and is smaller than the first counter force;
- wherein in accordance with the depressing action of the transmitting member, in a portion of the depressing action, the depressing action is transmitting to the first swingable member through the second swingable member, the first swingable member swings against the biasing due to the first biasing means;
- and
- wherein in accordance with the releasing action of the transmitting member, in a portion of the releasing process, the second swingable member swings against the biasing due to the second biasing means.
5 more elements
An electronic musical instrument keyboard apparatus having a key, the key including a depressing action and a releasing action, the keyboard apparatus comprising:
- a first swingable member supported for swinging movement in accordance with the depressing action of the key;
- a resilient member adjacent to the first swingable member for applying a first bias to the first swingable member and a first counterforce to the key that resists the depressing action of the key;
- and
- a second swingable member supported so that it cannot swing with respect to the first swingable member during the depressing action of the key, but is free to swing with respect to the first swingable member during the releasing action of the key;
- wherein a second bias is applied to the second swingable member, producing a second counterforce on the key that resists the releasing action of the key;
- wherein the second counterforce is smaller than the first counterforce;
- wherein during a portion of the depressing action of the key, the first swingable member and second swingable member swing as a unit against the first bias from the resilient member;
- and
- wherein during a portion of the releasing action of the key, the second swingable member swings independent from the first swingable member against the second bias.
6 more elements
An electronic musical instrument keyboard apparatus comprising:
- a transmitting member including a depressing action and a releasing action;
- a first swingable member supported for swing movement in accordance with the depressing action of the transmitting member;
- a resilient member adjacent to the first swingable member for applying a first bias to the first swingable member and a first counterforce to the transmitting member that resists the depressing action of the transmitting member;
- a second swingable member supported so that it cannot swing with respect to the transmitting member during the depressing action of the transmitting member, but is free to swing with respect to the transmitting member during the releasing action of the transmitting member;
- wherein a second bias is applied to the second swingable member, producing a second counterforce on the transmitting member that resists the releasing action of the transmitting member;
- wherein the second counterforce is smaller that the first counterforce;
- wherein during a portion of the depressing action of the transmitting member, the depressing action is transmitted to the first swingable member through the second swingable member, the first swingable member swings against the bias from the resilient member;
- and
- wherein during a portion of the releasing action of the transmitting member, the second swingable member swings against the second bias.
6 more elements
A keyboard apparatus for an electronic musical instrument, the keyboard apparatus comprising:
- a chassis;
- a plurality of transmitting members supported on the chassis, each transmitting member including a depressing action and a releasing action;
- a first swingable member coupled to the chassis for swinging in a first direction in accordance with the depressing action of a corresponding transmitting member and for swinging in a second direction opposite to the first direction, wherein when the first swingable member is urged toward the chassis in a first swinging position, the swing in the second direction is limited;
- a first biasing member supported between the chassis and the first swingable member for applying a first bias to the first swingable member that biases the first swingable member in the second direction and for applying a first counterforce to the transmitting member that resists the depressing action of the transmitting member;
- a second swingable member coupled to the first swingable member for swinging in the second direction in accordance with the releasing action of the transmitting member, wherein when the second swingable member is urged toward the first swingable member in a second swinging position, the swing of the second swingable member in the first direction is limited;
- and
- a second biasing member supported between the first swingable member and the second swingable member for applying a second bias to the second swingable member that biases the second swingable member in the first direction and for applying a second counterforce to the transmitting member that resists the releasing action of the transmitting member;
- wherein the second counterforce is smaller than the first counterforce;
- wherein the transmitting member momentarily engages the second swingable member during the depressing and releasing action of the transmitting member;
- wherein during a portion of the depressing action of the transmitting member, the transmitting member engages the second swingable member and transmits the depressing action of the transmitting member to the second swingable member in the first direction, and the first swingable member and the second swingable member swing as a single unit in the first direction against the first bias from the first biasing member;
- wherein after the depressing action of the transmitting member has substantially concluded, the engagement between the transmitting member and the second swingable member is canceled, and the first swingable member and the second swingable member swing as a single unit in the second direction to the first swinging position due to the first bias from the first biasing member;
- wherein during a portion of the releasing action of the transmitting member, the transmitting member engages the second swingable member and transmits the releasing action of the transmitting member to the second swingable member in the second direction, and the second swingable member swings independent from the first swingable member in the second direction against the second bias from the second biasing member;
- and
- wherein after the releasing action of the transmitting member has substantially concluded, the engagement between the transmitting member and the second swingable member is canceled, and the second swingable member swings independent from the first swingable member in the first direction to the second swinging position due to the second bias from the second biasing member.
11 more elements
Dependencies are inferred from the claim text.