Patent ID: 6525257
Filing Date: 2003-02-25
Classification: G10C,G10H

Abstract:
A device for producing pressure points in keyboards for electronic keyboard instruments having a frame, the device comprising:a) at least one key lever disposed on, and coupled to the frame; b) at least one electromagnet coupled to said at least one key lever; c) at least one rod shaped anchor coupled to said at least one electromagnet; d) at least one contact surface coupled to said at least one rod shaped anchor and disposed on an underside said at least one key lever; e) at least one rod shaped sensor magnet made from a permanent magnet, coupled to, and disposed below each of said at least one key lever, wherein said at least one rod shaped sensor magnet is movable along its rod axis when said at least one key lever is actuated; f) at least one hall sensor coupled to the frame, and disposed adjacent to said at least one rod shaped sensor magnet, wherein said at least one rod shaped sensor magnet is guided free of contact adjacent to said at least one hall sensor; g) at least one comparator unit in communication with said at least one hall sensor wherein said at least one rod shaped sensor magnet excites said at least one hall sensor wherein information relating to the position and time of said at least one key lever is transmitted by said at least one hall sensor to said at least one comparator unit, which converts analog position data into digital position data; h) at least one programmable evaluation unit coupled downstream of said at least one comparator unit; i) at least one digital signal processor coupled to said at least one programmable evaluation unit which generates data for said at least one digital signal processor; and j) at least one electromagnetic drive coupled to said evaluation unit and in communication with said at least one electromagnet, said at least one electromagnetic drive for controlling said at least one electromagnet to simulate a defined pressure point curve based upon an interpretation of said digital position data using a program when said at least one key lever is actuated.