Abstract: A wireless coordinate reader composed of:a sense line plate having a plurality of excitation lines and a plurality of sense lines arranged thereon; a coordinate indicator including a resonant circuit having a resonance frequency in proximity to the frequency of an excitation signal and composed of a coil and a first capacitor, and a switch circuit connected in parallel with the resonant circuit and composed of at least one series circuit of a switch and a resistor, and a second capacitor connected in series with one end of the the circuit; an amplification detection circuit for detecting the magnitude of an induction signal which is induced on a selected sense line when the excitation signal is applied to a selected excitation line and the coordinate indicator is placed above the sense line plate in the vicinity of the selected lines and for outputting an amplitude signal representative of the magnitude of the induction signal; a phase detection circuit for receiving a signal corresponding in phase to the exc

Abstract: In construction of an electronic musical instrument having plural musical tone controllers such as keys, push buttons and an expression pedal unit, a number of pulses are generated depending on the extent of movement of each controller on output lines whose number is smaller than that of the pulses so generated and musical tone control parameters such as tone volume, tone color and tonal pitch are changed in multi-stage fashion in response to the pulses generated. Generation of musical tones is assured whilst well reflecting delicate change in player's emotion via subtle key touch control.

Abstract: A modular retroactive keyboard fitted with keys permitting to send back to the user a perception characteristic of the key. Each key is an element of an independent flat and parallelepipedic module that includes a motor, a position detector and an electric connector. Each module further includes arrangement for fixing it to the adjacent module, and the keys are connected to a central processing unit for giving them the desired response by acting on the motor and for processing the detector signals.

Abstract: Electronic telephone set, comprising a transmission circuit arranged for being coupled to a telecommunication network and for receiving and transmitting speech signals, a keyboard means comprising a first matrix with respective numbers of intersecting first and second conductors and at the intersections of the first and second conductors key switches coupled to the respective first and second conductors for producing dial information and status information and including a second matrix with one intersecting first and second conductor or a plurality thereof respectively, and having setting circuits conducting current in one and the same direction coupled to the respective first and second conductors at selected intersections of the latter first and second conductors, whereas all second conductors of the second matrix are arranged common to those of the first matrix, and including a control circuit arranged for generating dialling signals compatible with the telecommunication network in response to the dialling

Abstract: The present invention is directed to a circuit arrangement for adjustment of the triggering point of the keys in an inductive keyboard. The keyboard consists essentially of a printed circuit board designed in a matrix-like manner, comprising coils superimposed upon each other, into which a ferrite pin plunges when a key is actuated. By the cooperation of a pulse generator with a current switch which can be influenced through control lines, said cooperation being controllable by a microcomputer, a current pulse is coupled from one coil to another coil and is recognized as a readout signal by a controllable readout amplifier and is conducted further to a central unit. The adjustment of the triggering point of the keys is accomplished by varying the steepness of the driving current pulse, for example, by means of a blocking time duration in the charging of a capacitor determined only once, which durations are stored in a table of values, or it is derived from the fundamental interlinked signals of the keys.

Abstract: A pen-type computer input device is used to move a cursor on the display of a computer system or enter data such as of figures, letters, numerals, or the like into a computer system. The pen-type computer input device includes a shank, a ball rotatably supported on the tip end of the shank, the ball having a plurality of identifiable regions on an outer peripheral surface thereof, and a circuit including a sensor unit for detecting the identifiable regions in response to rotation of the ball, and for detecting the directions in which the ball rotates and the distances by which the ball moves two perpendicular directions in a plane, and producing an output signal representative of the directions and distances. Since the sensor unit can detect the distance by which the pen-type computer input device moves without any mechanical motion transmitting mechanism incorporated in the shank, the pen-type computer input device may be small in size and can be handled with ease.

Abstract: An optical keyboard comprising: a flat optical block whose top face (9) is intended to co-operate with the keys (12); light inlets (2) and light detection outlets (3) having intersections (4) which couple one light inlet with one light detection outlet; key-actuated elements situated at the intersections for coupling or decoupling the inlets and the outlets; optical ducts which are unobstructed from a corresponding light inlet to a corresponding matrix intersection, and from a corresponding matrix intersection to a corresponding light detection outlet; and a scanning stage for applying a signal successively to each of the inlets and for observing the state of each of the outlets after each signal application; is characterized in that the light inlets and the light detection outlets are disposed along the same one of the sides (31) of said optical block, with each key emplacement being directly connected to a single light emitter and a single light receiver via respective optical ducts (2, 3).

Abstract: A character input device for a computer comprised of a plurality of switches or threshold zones adapted to be activated by a disk movable with the tip of a pen in preset serial patterns.

Abstract: The portable terminal keyboard includes silicone rubber mixed with phosphorescent material used on the external exposed surface of the keyboard and conventional silicone rubber used for the moving parts, so that it is luminous for a certain duration by being irradiated for a while with a light source, thereby facilitating the user's entry operation and also enhancing the durability of the keyboard. The keyboard has its key mat made of a magnetic material so that it is attached by magnetism to the main frane, thereby faciliting replacement with a different key mat. The magnetic key mat structure allows the single access attachment and eliminates such conventional fixtures as lugs, whereby the key mat can be replaced more easily even in darkness and the lugs or the like are not present to be damaged as would be otherwise caused by frequent key mat replacement.

Abstract: A keyboard connectable to scanning means and constituted by an optical block comprising: a top face, a bottom face, and at least one edge interconnecting said faces; a plurality of light injection inlets (2) and a plurality of detection outlets (3) disposed so as to define optimum paths passing through said block between said top and bottom faces and establishing a logical matrix having intersections each of which associates one of said inlets and with one of said outlets; and reflectors (5) disposed at said intersections in order to couple the associated inlet/outlet paris; the keyboard being characterized in that said reflectors are fixed, in that said reflectors and the said optical paths going from the light injection inlets and arriving at said detection outlets are all at the same level; in that at least some of said optical paths cross one another physically at said level, and in that key-operatable shutters (4) are provided in order to allow, to limit, or to prevent at will the coupling established by

Abstract: A push button for an inductive value input keyboard having a push-button socket, a push-button head guided in the push-button socket, a compression spring which acts between the push-button socket and the push-button head, a stop which limits the stroke of the push button in the non-actuated state, and a rod-shaped iron core fastened to the push-button head for interaction with an induction coil formed by conductor paths upon a printed circuit board on which the push button is arranged. A sleeve is molded at the push-button head and has a non-cylindrical aperture therethrough and is elastically deformable transverse to its axis within which the iron core is clamped.

Abstract: A musical keyboard having keys which carry metal spoilers that alter the resonance characteristics of tank circuits associated with the keys as the keys move toward and away from the inductance coils of the tank circuits. The tank circuits are connected sequentially to a frequency sensing circuit which develops indications of key positions by sensing the resonance frequency of each tank circuit.