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| Number | Title | Issue Date |
| 4765218 | Electronic keyboard musical instrument with processing of depression dynamics A keyboard circuit for an electronic musical instrument which, with the depression of a key, couples an AC signal to an allocated multiplexer input. The output of the multiplexer is connected via a rectifier and a sample-and-hold circuit to a depression r... | 08/23/1988 |
| 4689608 | Magnetically snap actuated contact keyboard apparatus In the preferred embodiment of the invention, the snap actuator is an angled magnetically permeable plate. One leg of the angled plate is attracted to a strip magnet placed on a circuitboard. This particular portion of the plate also has two spring finger... | 08/25/1987 |
| 4671688 | Shielded keyboard A shielded keyboard comprising a sheet of flexible fine wire mesh material between an array of keyboard contacts and an apposed array of switching actuators.... | 06/09/1987 |
| 4651611 | Touch dynamics signal generator for electronic musical instruments The touch dynamics of the operation of keys of an electronic musical instrument are determined through the use of pressure sensitive transducers associated with the keys, the transducers each including a magnetic field responsive semiconductor device and ... | 03/24/1987 |
| 4564832 | Membrane keyboard having key closure retention A membrane panel keyboard is presented having magnetic material in one contact element and magnetic field generating means to achieve self-retention or key closure retention when a key is actuated.... | 01/14/1986 |
| 4529967 | Non contacting inductive keyboard An inductive keyboard, including, printed circuit patterns forming a multiplicity of key excitation patterns and key sensing patterns. The key excitation patterns are divided into groups of excitation patterns formed in rows. The key sensing patterns are ... | 07/16/1985 |
| 4517553 | N-Key rollover keyboard An N-Key Rollover Type Keyboard sequentially scans the keys so as to transmit information correctly as to each key which is depressed without transmitting a garbled code which could result from simultaneous depression of two keys without the sequential sc... | 05/14/1985 |
| 4507651 | Contact-free push-button key for generating an electrical signal upon depression thereof A contact-free push-button key for converting mechanical energy into an electrical signal has a toroidal tape core comprised of material having a low magnetic retentivity such as an amorphous metal alloy, the toroidal tape core having an electrical windin... | 03/26/1985 |
| 4494109 | Noncontacting keyboard employing a transformer element Noncontacting transformer switches are interconnected into keyboard networks which include insertable magnetic core, shorted turn or combination actuators. In a preferred embodiment, windings are provided and interconnected to form differential transforme... | 01/15/1985 |
| 4408101 | Automatic telephone dialing apparatus with magnetic switch assembly A telephone number index and switch device has a series of magnetic switches which are located in fixed positions with corresponding surfaces disposed along a preestablished path of movement of a card finder associated with cards having names and telephon... | 10/04/1983 |
| 4398180 | Contactless keyboard In a contactless keyboard including for each key a transformer with a core displaceable by the key operation and including a compensation transformer common to all key the compensation transformer is so designed that with an unactuated key the signal comp... | 08/09/1983 |
| 4366463 | Keyboard A data entry device durable enough to withstand the rigors of industrial type usage in which the electronic components are isolated from the external environment is described. The device comprises a molded elastomer keyboard matrix with thin stainless ste... | 12/28/1982 |
| 4344068 | Coding schemes for acoustic delay line data collection system A magnetoacoustic system adapted to use as a keyboard can employ a serpentine acoustic delay line passing under a number of transducers which are activated simultaneously with a current pulse through the wire. Magnets adjacent to the wire generate magneto... | 08/10/1982 |
| 4300127 | Solid state noncontacting keyboard employing a differential transformer element A solid state noncontacting mechanically actuated keyboard type switch and interconnecting networks for switch arrays are described herein. The basic switch is a balanced or differential transformer element with a movable magnetic core, or shorted turn, a... | 11/10/1981 |
| 4298861 | Integrated ultrasonic magnetic encoder An ultrasonic waveguide provides the encoding of magnetic keys on a keyboard. The magnetic keys couple their respective magnetic fields to an ultrasonic waveguide producing signals in a given time relation to permit encoding by depressed keys. Since the n... | 11/03/1981 |
| 4283714 | Magnetic keyboard system A contactless travel keyboard has first and second coils with elongated loop portions arranged at each key station so that, when an electrically conductive key element at the station is in a key-up position spaced from the coils, electrical input to the f... | 08/11/1981 |
| 4268814 | Solid state keyboard A solid state keyboard comprised of a base module, a plurality of key members each having a plunger member comprised of a uniform mixture of a magnetic material such as barium ferrite and a binder such as nylon, and a respective plurality of improved Hall... | 05/19/1981 |
| 4203093 | Solid state keyswitch arrangement A solid state keyboard comprised of a base module, a plurality of key members each having a plunger member comprised of a uniform mixture of a magnetic material such as barium ferrite and a binder such as nylon, and a respective plurality of improved Hall... | 05/13/1980 |
| 4156820 | Miniature contactless switching unit A miniature contactless switching unit is disclosed for use in various kinds of position sensors with a magneto-electro converter. The miniature contactless switching unit includes a molded block case in which a permanent magnet and the magneto-electro co... | 05/29/1979 |
| 4145687 | Keyboard switch circuit for use in a matrix which has a series circuit including a reluctance element and a diode connected between each row and column of the matrix A keyboard switch circuit comprises a first plurality of terminals associated with m rows and a second plurality of terminals associated n columns. A plurality of series circuits each including a reluctance element and a diode are connected between the te... | 03/20/1979 |
| 4117438 | Contactless keyswitch for keyboards Inductive sensing keyswitch includes a printed circuit transformer and sheet of material having hinged metal flaps formed therein and each flap is resiliently biased against both printed circuit coils of the transformer for eddy-current shorting of both c... | 09/26/1978 |
| 4099176 | Magnetic key switch having a removable support assembly A keyboard switch employing a saturable magnetic core and a pair of permanent magnets attached to a key stem is disclosed. When the key is not depressed the saturable magnetic core is saturated by the adjacent magnets, and when the key is depressed the co... | 07/04/1978 |
| 4097802 | Magnetoresistive field sensor with a magnetic shield which prevents sensor response at fields below saturation of the shield A thin film magnetoresistive sensor of NiFeCo is juxtaposed with a saturable thin film shield of more highly permeable NiFe material. The curve depicting change of resistance of the sensor as a function of applied magnetic field is flattened, permitting t... | 06/27/1978 |
| 4081068 | Keyboard actuable with the aid of the fingers of at least one hand A keyboard, actuatable with the aid of fingers of at least one hand is described which keyboard includes a support frame, a normal row of keys therein, each of which can be moved out of an initial position of the fingers by the tips of the index finger, m... | 03/28/1978 |
| 4028696 | Double depression magnetic keyswitch A keyswitch for a keyboard which may generate either a first signal or a second signal is formed by a pair of saturable magnetic cores and corresponding drive and sense line wires that are molded into a unitary support assembly in a keyswitch housing. A p... | 06/07/1977 |
| 4017850 | Magnetic keyswitch with two-piece support assembly A keyswitch for a keyboard is disclosed that has a support assembly which holds a saturable magnetic core and drive and sense line wires for the core. A plunger and magnet assembly that is depressible relative to the housing of the switch allows a permane... | 04/12/1977 |
| 3964062 | Keyboard switch system A keyboard switch system for stenographic machines whereby electrical signals corresponding to key depression may be derived. The switch system is comprised of a plurality of coils each having a coil parameter effecting plunger coaxial therewith and sprin... | 06/15/1976 |
| 3938642 | Magnetic key touch control The "touch" or "feel" of a key in a keyboard is controlled by a system of permanent magnets. A first magnet is attached to one end of a key lever and the key lever is pivoted intermediate its ends. A bias spring is provided to normally bias the key lever ... | 02/17/1976 |
