Keyboard apparatus for electronic musical instrument with key depression detection unit
First Claim
1. A keyboard apparatus for an electronic musical instrument, the keyboard apparatus defining a key depression-release direction and a key arrangement direction generally transverse to the key depression-release direction, the keyboard apparatus comprising:
- a key depression displacement sensor unit, the key depression displacement sensor unit including;
a first resilient member;
a first displacement detection sensor associated with the first resilient member for detection of a key depression force in the key depression-release direction;
a second resilient member coupled to the first resilient member in a unit;
a second displacement detection sensor associated with the second resilient member for detection of a key depression force in the key arrangement direction; and
a fixing member to be fixed to the key board apparatus for supporting both the first and second resilient members such that the second resilient member is movable in the key arrangement direction and the first resilient member through the second resilient member is movable both in the key arrangement direction and in the key depression-release direction.
1 Assignment
0 Petitions
Accused Products
Abstract
A keyboard apparatus for an electronic musical instrument includes a key displacement detection unit. The key displacement detection unit includes a first resilient member, a movable member connected to the first resilient member, a second resilient member connected to the movable member, and a base fixing member connected to the second resilient member. The base fixing member may be directly or indirectly fixed to a keyboard musical instrument so that the key displacement detection unit is mounted to the keyboard musical instrument. A first displacement detection sensor is coupled with the first resilient member for detecting a key depression force in a key depression-release direction, and a second displacement detection sensor is coupled with the second resilient member for detecting a key depression force in a key arrangement direction. Both the first displacement detection sensor and the second displacement sensor are mounted on the key displacement detection unit. The first resilient member and the second resilient member are connected to the movable member in a folded manner. As a result, the key displacement detection unit becomes small in size and yet provides a relatively large displacement in the first and the second resilient members with a relatively small key depression force.
60 Citations
22 Claims
-
1. A keyboard apparatus for an electronic musical instrument, the keyboard apparatus defining a key depression-release direction and a key arrangement direction generally transverse to the key depression-release direction, the keyboard apparatus comprising:
a key depression displacement sensor unit, the key depression displacement sensor unit including; a first resilient member; a first displacement detection sensor associated with the first resilient member for detection of a key depression force in the key depression-release direction; a second resilient member coupled to the first resilient member in a unit; a second displacement detection sensor associated with the second resilient member for detection of a key depression force in the key arrangement direction; and a fixing member to be fixed to the key board apparatus for supporting both the first and second resilient members such that the second resilient member is movable in the key arrangement direction and the first resilient member through the second resilient member is movable both in the key arrangement direction and in the key depression-release direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
10. A key displacement detection unit for an electronic keyboard apparatus defining a key depression-release direction and a key arrangement direction transverse to the key depression-release direction, the key displacement detection unit comprising:
-
a first resilient member; a movable member connected to the first resilient member; a second resilient member connected to the movable member wherein the first resilient member and the second resilient member define a folded structure about the movable member; and a base fixing member connected to the second resilient member and spaced a distance from the first resilient member. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A key displacement detection unit for an electronic keyboard apparatus defining a key depression-release direction and a key arrangement direction transverse to the key depression-release direction, the key displacement detection unit comprising:
-
a first leaf spring disposed in a plane generally extending in the key arrangement direction and having a front end portion for receiving a key depression force and a rear end portion; a movable block connected to the first leaf spring at the rear end portion; at least a second leaf spring disposed in a plane generally extending in the key depression-release direction and having a front end portion and a rear end portion, the second leaf spring being connected at the rear end portion thereof to the movable block wherein the first leaf spring and the second leaf spring define a folded structure about the movable block; and a base fixing member connected to the front end portion of the second leaf spring, wherein the front end portion of the first leaf spring is flexible in the key depression-release direction and movable in the key arrangement direction, and the second leaf spring is flexible in the key arrangement direction. - View Dependent Claims (20, 21, 22)
-
Specification