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7386882 Key pad decoder  
A system for determining which key of a key-pad device is activated by an algorithm that employs the same number of steps to make the determination regardless of which key is pressed. In one...
7167107 Keypad array having reduced number of input/outputs and method for generating same  
The invention concerns a method ( 200 ) of generating an array ( 100, 300, 400 ) having a reduced number of input/outputs ( 114, 314, 414 ). The method includes the steps of, for each array row...
7056043 Keyboard for a mobile device  
An apparatus has a keyboard panel with a QWERTY array of alphabetic key actuation indicia. The apparatus further has a QWERTY array of keys that are free of alphabetic key actuation indicia, and...
6985080 Flame sense circuit and method with analog output  
An analog flame sense circuit is provided that utilizes the flame rectification method of sensing flame. The circuit uses an AC voltage source and discrete components to provide the sensing of the...
6833825 Apparatus for remotely controlling a digital processing system  
According to one aspect of the invention an apparatus is provided for remotely controlling a digital processing system, comprising a housing, a scrolling detector, a cursor positioning detector,...
6705783 Ruggedized keyboard with cursor positioning device  
A rugged keyboard and cursor positioning device with an inherent restiveness from external fluids to interior keyboard fluid contamination. The key interrupters and cursor positioning device block...
6417787 Method and apparatus for increasing the number of keys of a key-matrix  
An apparatus and a method for increasing the number of keys in a ready made key-matrix , it is necessary to increase some extra diodes and change the keyboard scanning method . To increase some...
6198475 Touch operation information output device  
A touch operation information output apparatus is provided in a position at which a driver can operate it, and detects a touched position with respect to the input pad and outputs its coordinate...
6104318 Method for entering a special mode of an electric device  
A method for entering a special mode of an electric device in which the special mode such as a test mode exists. According to the method, at least two coded keys are continuously inputted. From an...
5689247 Automated system for identifying authorized system users  
A method and apparatus for identifying authorized users of a secure system. A user of the secure system is prompted to enter a personal identification code which is then received into the secure...
5583498 Input device  
In an input device, switches are disposed at points of intersection of an n×m matrix, a scanning signal is applied from rows or columns of the matrix, and an operated switch is detected by...
5552781 Fault tolerant method of decoding an electronic key system  
A fault tolerant method of decoding an electronic key system includes the steps of reading a key return image from one or more actuated keys and comparing the read key return image to the previous...
5539400 Ultra-low power, scan on demand keypad encoder  
A keypad encoder is used with a keypad having an array of keys arranged in columns and rows. Depressing any key on the keypad closes a corresponding switch, coupling one of the columns to one of...
5523755 N-key rollover keyboard without diodes  
A n-key rollover keyboard having an application specific integrated circuit (ASIC) with a large number of pins, each pin directly connected to a key contact, with the other side of the key contact...
5486824 Data processor with a hardware keyscan circuit, hardware keyscan circuit, and method therefor  
A data processor (50) includes a hardware keyscan circuit (54) to interface to an external keypad matrix (80). In one embodiment, the data processor (50) has a first register (62) for driving data...
5448236 N-key rollover circuit  
An N-key rollover circuit including a matrix of crossing drive and output lines, switch elements connected between the drive and output lines, series resistors connected to the switch elements and...
5424730 Method and apparatus for differentiating simultaneous and sequential key strokes  
A method differentiates simultaneous and sequential key strokes by detecting simultaneous key strokes if two keys are pushed within a judging time T L . The method includes the steps of (a)...
5371498 Circuit for recognizing key inputs  
A circuit for recognizing double key inputs includes a key input part, a key signal generating part, a comparing circuit and a detecting part, the key signal generating part operates simultaneously...
5264845 Key scan circuit and method in a microcomputer system  
A key scan circuit and the method thereof in a microcomputer is disclosed which requires no diode for preventing circuit short and performs key check or automatic operations with a simplified...
5177330 Key board switch  
A key board switch capable of permitting all key switches to exhibit an N-key rollover function at a low cost while preventing an increase in thickness of the key board switch. For this purpose, a...
5137383 Chinese and Roman alphabet keyboard arrangement  
An apparatus and method for encoding Chinese characters into a computer. Each character is divided into a leading part and a body part. The leading part is represented by one code element and the...
5059974 Method for determining phantom switch condition  
A method of determining a phantom key condition in an encoder array (10) including (1) enabling each row (R1-R14) of the encoder to a high position; (2) pulling the first row (R1) to be scanned to...
5053585 Multipurpose keyboard using digitizer pad featuring spatial minimization of a pressure contact area and method of making same  
A multipurpose keyboard incorporating an electronic pressure sensing device, a digitizer pad featuring spatial minimization of a pressure contact area capable of locating the leading and trailing...
4994634 Sheet switch  
A sheet switch comprises a pair of flexible insulative films, one of which is provided with a plurality of electrodes, resistances connected to the electrodes, respectively, and line patterns for...
4988997 Method for character code generation  
In a keyboard operation two sequential keystrokes are used for generation of a character code. A rule is set up according to which some preset combinations of two sequential keystrokes are valid...
4929944 Key input apparatus  
An input key apparatus comprises a keyboard including a plurality of keys and generating key signals when keys are pressed and a key input decoder receiving the key signals from the keyboard for...
4922248 Key output method for keyboards  
A keyboard with N-key rollover has a matrix of key columns and lines for successively issuing key codes for depressed keys. When first and second keys on the same column are detected as being...
4918444 Key-depression data input device  
A key-depression data input device for detecting a depressed key in a plurality of keys arranged in a key matrix, the device including phantom key detection unit for detecting an occurrence of...
4878056 Key input circuit  
A plurality of key switches are provided, each of which is connected, at one end, to the ground, and at the other end, to a power supply, by means of a resistor. The key switches are coupled, at...
4833447 Input device  
An input device relating to the manipulation of data indicating the depressed state of key switches and to the transmission of data and adapted for picking up on-off data on switches provided at...
4817010 Vending machine control with improved vendor selector switch detection and decoding apparatus  
A vending machine control with an improved vendor selector switch detection and decoding circuit is described which detects and decodes the closure of selector switches in a vending machine...
4794375 Keyboard crosspoint encoder having pseudo-n-key rollover  
A crosspoint encoder having a n-key rollover data collection system in which all keystrokes are recognized. A phantom key detection routine detects phantom key conditions and provides for temporary...
4739310 Keyboard control system  
A keyboard control system is comprised of a key matrix circuit and a keyboard controller. The key matrix circuit includes scanning lines and return lines, these lines being connected to keys on a...
4728931 Charge redistribution capacitance detection apparatus  
A charge redistribution capacitance detector is disclosed for detecting whether the capacitance of a variable capacitor is smaller or larger than that of a reference capacitor. First plates of the...
4713564 Bounce-nullifying switch unit  
The opening and closure of the contacts of a push-button actuated switch duces across impedance means a voltage which is stably high and low when such contacts are maintained closed and open,...
4709228 Electronic data input keyboard comprising keys provided with conductive contacts  
In matrix keyboards whose keys are provided with conductive contacts and are arranged at respective crosspoints of conductors, a diode is connected in series with each key contact in order to allow...
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...
4498073 Keyboard with simultaneous operations  
A keyboard in which, when one of the function keys is depressed simultaneously with one of the character keys, the signal generated by the depressed function key is transmitted during a first...
4420744 Keyboard crosspoint encoder having N-key rollover  
A keyboard crosspoint encoder and a method of operating it which provide N-key rollover. The encoder has an information storage device. The matrix of crosspoint switches is scanned to determine the...
4359613 Molded keyboard and method of fabricating same  
A moldable, impulse operation synthetic resin keyboard, and a method of fabricating the same, are provided wherein the keyboard achieves essentially standard, tactile feel and feedback, mechanical...
4359612 Universal keyboard and method of producing same  
An extremely low cost, high speed, full stroke keyboard is disclosed which provides momentary impulse operation. N-key rollover protection and standard tactile feedback. The keyboard includes a...
4278965 Photo-optical keyboard having n-key rollover  
The invention relates to a photo-optical keyboard having an improved keyboard housing and keys to provide an N-key rollover feature. The keyboard is comprised of a keyboard housing and keys, and...
4193038 Key input apparatus  
A key input apparatus is provided with a plurality of input operation keys and a time signal generating circuit which in correspondence to the number of these input keys performs a step operation...
4140883 Keyboard with selective key entry block  
Particular keys are provided with locking arms that may or may not enter a duct filled with balls and being displaceable in the duct only if a locking element is not inserted. That element will be...
4121048 Multiple shift electronic keyboard  
A full-roll electronic keyboard having upper and lower case capabilities is disclosed. The keyboard includes a shift key which when depressed will generate first and second coded signals with the...
4109315 Wristwatch calculator with selectively scanned keyboard  
A wristwatch calculator is provided with a keyboard for the entry of information into and control of operations of the apparatus. The keyboard comprises an array of switches connected in an X-Y...
4109118 Keyswitch pad  
The keyswitch pad includes a plurality of keyswitches on a common backing member, each of the keyswitches including a fluid filled bag underneath a key cap. The bags of the keyswitches are...
4105902 Touch sensitive input for electronic wristwatch and/or electronic calculator  
A touch sensitive input particularly suited for use with an electronic wristwatch, an electronic calculator or a combination thereof is provided. The touch sensitive input includes a touch...
4103289 Calculator theft prevention device  
A security device for an electronic calculator consists of an electronic circuit within the calculator which permits operation of the calculator only after the operator has correctly operated a...
3978474 Keyboard with N-key lockout and two-key rollover protection  
A keyboard having N-Key Lockout and Two-Key Rollover Protection is disclosed. Each key switch of the keyboard is assigned a unique time slot in a scan cycle. A key switch actuation results in a...
Matches 1 - 50 out of 69 1 2 >