Abstract: An electronic fuel control system for varying the fuel flow to a gas turbine engine during the engine's acceleration. The reference speed set point of the engine's fuel controlling governor is increased as a function of the elapsed time from engine start-up and the engine characteristics so that the engine accelerates substantially along its "required to run line.
Abstract: A logic circuit subsection of a digital watch integrated circuit (IC) chip which enables the final watch electronics module to determine whether it is in a two or three button watch. The IC chip then uses this information to alter the pushbutton responses so that it is appropriate for either a two or three button watch.The logic circuit of the present invention consists of a plurality of logic gates in combination with latching means which cause the digital watch to be in either a two or three button mode.In the two button digital watch, by placing the batteries in the watch the circuit of the present invention causes the watch to be in the two button mode, and to thereby function as a two button watch. Simultaneous depression of both of the watch's buttons will also cause the watch to be in the two button mode.In the three button watch, depression of the third button will cause the watch to be in the three button mode and to thereby function as a three button watch.
Abstract: A flexible printed circuit, located within a digital watch, which provides the interconnection circuitry between the digital watch's electro-optical displays and the electronic components and the batteries and the watch push buttons. The flexible printed circuit consists of a pliable plastic material to which battery contacts, push button contacts, interconnection circuitry (between the batteries, watch push buttons, electronic component, and electro-optical displays), and contacts for the electronic components and displays are affixed.
Abstract: A digital LED display watch is provided with 1) an operating button to select and control display of data in the normal operating mode, and 2) a recessed button to select separately for possible setting each unit of horological data except seconds. The display of the data selected for possible setting is flashed, and the actual advancing is controlled by the operating button. The data displayed in the normal mode is timed hours-minutes, separated by a colon, with seconds after hours-minutes if the operating button is held down, and month-date separated by a dash if the operating button is pushed twice. In the setting mode, data not being set (but otherwise associated in the display with data that is) is blanked, but the colon or dash is retained. During setting of hours the dash is added to the colon during the first 12 hours of each day to indicate AM. An optional recessed button is provided to manually select the duty cycle of the LED display and thus alter apparent brightness and power consumed.
July 9, 1975
Date of Patent:
April 18, 1978
Hughes Aircraft Company
Richard J. Belardi, Norman E. Moyer, Ernest C. Ho
Abstract: A digital timing circuit in a digital watch with a two digit display. When said circuit is activated by a push button, the two display elements first display the hours information, next are blank for a short duration, then display the minutes information, then go blank until the button is pushed again.
Abstract: A resettable interval timer in combination with, but functioning independently from a digital watch which provides horological information. The watch operates in two modes; the first mode displaying horological information on the display devices and the second or stopwatch mode displaying interval timing information on the display devices. In the watch mode the user can program which horological information he desires to be continuously displayed on the display devices, either hours, minutes, and seconds, or hours, minutes, and date. By depressing one of the watch push buttons the user can momentarily display month, date, and the A.M. or P.M. horological information on the display devices. A predetermined push button depression sequence can be used to reset the horological information. When a second push button is depressed a predetermined number of times within a defined time interval the watch enters the stopwatch mode.
Abstract: A tabulator keyboard of simplified design may be fabricated from a single flexible circuit and a minimum of other mechanical structures. The flexible circuit combines in one piece an array of deformable upper contacts, an array of stationary lower contacts, as well as the required interconnections between the elements of these arrays and the electronics module. The flexible circuit may be made of a reasonable transparent dielectric film (e.g. polyamide). The flexible circuit is folded in use such that the lower stationary array has its conductive surface opposite the upper deformable array. Means are provided for making electrical contact between a selected element in said lower array with a selected element in said upper array.