Abstract: A color matrix display including a color matrix reflective filter (10) having groups of reflective red, green and blue (R, G, B) color elements (12) arranged in subgroups (20). The elements (12) of each color group (R, B, G) in each subgroup (20) are aligned with pixel subgroups of a matrix control element or LCD (18). The color elements (12) of the reflective filter transmit light (26) of their associated color to an aligned pixel associated with that color and reflect back (30) light of other colors to a reflective light assembly (16) for reuse. The color matrix reflective filter (10) is made by selectively exposing selected areas of a holographic optical element, or HOE, with a light of colors other than the color desired to be transmitted by that element (12) of that selected area.

Abstract: Disclosed are a method and a matrix panel masking apparatus for forming very closely spaced, parallel, elongated, narrow, and electrically separate conductors on a dielectric surface. The matrix panel masking apparatus comprises a plurality of elongated taut wires, being arrangable in a configuration so that the interstices between the wires correspond to the desired matrix panel conductor pattern. The method includes: superposing the matrix panel masking apparatus of this invention on the dielectric surface, depositing conductive material through the interstices and on the dielectric so that after the masking apparatus is removed, the conductors will remain.

Abstract: A capacitive transducer is disclosed which provides a measurement of acceleration. The transducer includes a semiconductor element having a mass ring suspended from an elastic diaphragm which is retained by a support. The mass ring is formed to have opposed parallel planar surfaces, each of which are spaced adjacent a metal layer deposited on a glass substrate to form a capacitive circuit. The metal layers are configured in the shape as the flat surface of the mass ring and are coupled to provide an electrical output. The semiconductor element forms a common capacitor plate disposed between the two capacitor plates formed by the metal layers. Movement of the mass ring in response to acceleration causes a change in the spacing between the mass ring and metal layers thereby changing the capacitance and providing a measure of acceleration.

Abstract: A piezoresistive acceleration sensing transducer is disclosed which enables low cost microcircuit construction of accelerometers. A silicon wafer is etched to form individual acceleration sensing elements each of which includes a mass ring suspended from a diaphragm and mounted to a center pedestal support portion. A plurality of piezoresistive strain gauges are located on the diaphragm about the periphery of the pedestal portion and are positioned to form a circuit for sensing strain produced in the diaphragm by movement of the mass ring in response to acceleration. A pair of temperature sensors are located in a zero-stress area of the diaphragm to compensate for temperature effects. In one embodiment, the gauges are coupled in a bridge circuit to provide a measure of acceleration in one axis only. In another embodiment, the mass ring is modified to locate its center of mass above the plane of the diaphragm so that the mass ring responds to acceleration in three axes.

Abstract: This disclosure describes a method and apparatus for using a single sensor to determine the relative velocity between an object and a fluid stream, the average temperature, pressure and/or density of the fluid stream, and thereby the mass flow of the fluid stream. Select properties of a signal, such as a sonic signal, directed through a vortex street are detected using modifications of existing single sensor vortex volumetric flowmeter methods and apparatus. The modifications facilitate the measurement of mass flow by measurements of the relative energy of the signal and the temperature of the fluid as ascertained from the time delay in signal passage from a signal directing means (43) to a signal receiving means (45).

Abstract: The faces of transducers for transmitting or receiving sonic signals have outwardly protruding conical shapes to reduce problems caused by reflections of the sonic signals.