Abstract: An advanced co-fired multichip/hybrid package comprises a castellated base, each castellation leading to a pad. An insulated wall rises from the leads, but not from the pads, and is topped by a kovar sealing ring and a layer of solder. A board of chips or other electronic components has a plurality of metallized vias extending therethrough, each via being in registration with a pad and having a ball of solder placed in it. A kovar lid is placed on the wall, and the entire apparatus is fired and cooled. The solder on the wall seals the lid to the wall, and the solder ball in each via bonds the board both mechanically and electrically to the base. No wire bond is needed.

Abstract: An advanced co-fired multichip hybrid package comprises a castellated base, each castellation leading to a pad. An insulated wall rises from the leads, but not from the pads, and is topped by a kovar sealing ring and a layer of solder. A board of chips or other electronic components has a plurality of metallized vias extending therethrough, each via being in registration with a pad and having a ball of solder placed in it. A kovar lid is placed on the wall, and the entire apparatus is fired and cooled. The solder on the wall seals the lid to the wall, and the solder ball in each via bonds the board both mechanically and electrically to the base. No wire bond is needed.

Abstract: A laser cathode is formed by placing a conductive hemisphere on the side of the lasing cavity. Material is sputtered from the hemisphere to form a conductive layer on the cavity side and on the seal which bonds the hemisphere to the side. A protective oxide layer is formed on the sputtered layer and the hemisphere by filling the cathode with oxygen and passing a current through it.

Abstract: A planar matrix of display picture elements is operated by supplying power to the picture elements by a high current planar drive electrode connected to the picture elements, and a planar counter electrode slightly separated from the picture elements' display dots, and by addressing the picture elements with low current leads parallel to the plane of the matrix. The planes of the electrodes are parallel to the plane of the matrix. The elimination of high current power leads improves response time and resolution. The separation of the counter electrode from the display dots eliminates the need to refresh the picture elements. An isolation transistor in series with the drive transistor allows simultaneous color change of the entire matrix by simultaneous turning on and off of all isolation transistors.

Abstract: A current carrying drive coil in a magnetic field is moved by the field. An attached tachometer coil, passing through the same field, produces a voltage from which the speed of the coils may be calculated. Changes in the drive coil current produce noise in the tachometer coil. This noise is offset by combining the tachometer voltage with the voltage produced by a stationary pickup coil, which picks up only the noise.

Abstract: A microelectronic device is rendered resistant to reverse engineering by encapsulating it in a dual layer encapsulant. The inner layer is compatible with the operation of the device, and has a greater resistance to chemical attack then does the device. The outer layer includes a filler of barium sulfate and gadolinium oxide, to absorb X-rays and N-rays respectively, is more resistant to chemical attack than the inner layer, and includes a groove around its periphery, to preferentially allow chemical attack radially. A full chemical attack damages the device beyond usable inspection, but a partial chemical attack is insufficient to remove X-ray and N-ray concealment.

Abstract: The present invention eliminates the release of vapors from an adhesive which bonds an organic multilayer substrate to a ceramic layer. Posts from the organic layer are plated up sufficiently high as to enter holes in the ceramic layer, but not completely penetrate through them. The holes may then be filled with solder, which both seals the holes against the escape of adhesive vapors and makes a good electrical contact with the post. A conductive pad may then be stenciled on top of the solder plug, and the chip or other electric component mounted to the pad. The hole is preferably plated with a conductive material prior to being filled with solder, so that the solder may join the plating with the post. The solder plug is formed by forming a slurry of solder with alcohol, which is squeegeed into the holes and fused under pressure. A solder paste is then stenciled over the fused soldered power and is, itself, fused using the vapor phase.

Abstract: A superconductive gravimeter comprises a spool (12, 14, 16) and a circumferential magnet (20, 22, 24), both of which are covered with superconductive material (48, 52, 58, 60) except at the magnetic field gaps (54, 56, 62, 64) between them. A force rebalance coil (28, 30) lies in these gaps and supports a superconductive plate (70) above them. Leakage flux flows through the space between the plate and the circumferential magnet. Variations in gravity result in variations in the weight of the plate, resulting in variations in the height of the space, resulting in variations in the flux in the space, which are detected by a pick up coil (74).

Abstract: A millimeter wave power generator combines two laser beams, tuning the beat frequency to the desired millimeter wave value with an opposing pair of millimeter wave cavities. The combined beam is diffracted onto a plurality of externally powered, modulation doped field effect photodetectors (MDFEPs). A plurality of antennas is provided, one between each pair of adjoining MDFEPs. The antennas are parallel, and each is driven by the MDFEPs at its ends. The back propagating millimeter wave radiation is reflected forward by a wire grid parallel to the antennas. The grid is situated between the diffractor and the MDFEPs, and is spatially tuned to constructively interfere the reflected back propagating with the forward propagating millimeter wave radiation.

Abstract: An interface between a memory tester and a memory includes, in order, an inverter and digital line driver, a short section of coaxial cable, an impedance matching resistor, a level shifter (which may be omitted if the tester and the memory operate at a common voltage), an analog line driver, a long section of coaxial cable, and a final impedance matching resistor. Very high frequency memory interrogation is supported.

Abstract: A pair of single mode laser light sources are tuned to opposite sides of a frequency response curve which forms either a peak or a valley. The laser light sources are offset in frequency from each other by a fixed frequency interval. The average frequency may thus be stabilized at the peak or valley. A third single mode laser light source, offset in frequency at a fixed point between the frequencies of the pair of laser sources, may thus be actively stabilized at the peak or valley. The frequency spectrum is simple, and of high power.

Abstract: A liquid filled pathlength control device is disclosed that responds to a pathlength control signal for adjusting the pathlength in an optical signal process dependent on coherent light. The liquid filled pathlength control device has a housing containing a liquid filled chamber. The liquid filled chamber has an extendable wall having an inner surface subject to pressure from the liquid. An external mirrored surface on the extendable wall is inserted into and the light path. The liquid filled chamber has a deformable wall having an inner surface subject to the pressure of the liquid and an external surface. A displacement transducer is coupled to the deformable wall and responds to a control signal of a first polarity to deflect the internal surface of the deformable wall in a first direction to increase the pressure of fluid in the chamber.

Abstract: Sonic transponders mounted on a train and the track upon which it rolls transmit and receive sonic vibrations along the track. Information currently being transmitted electrically may also be thus transmitted sonically. Since the track interferes with the sonic vibration more than it does with an electrical signal, the condition of the track may also be determined.

Abstract: A high voltage pulse power converter comprises a modified type E pulse charging network (74) in series with a nonlinear magnetic switch (76). The network comprises a ladder of charging elements (78) each of which comprises a shunt section of a pulse charging module (80) in parallel with a pulse receiving capacitor (82), and a series section comprising an inductance (84). The pulse charging module (80) steps up power from a low voltage power supply (102) through a transformer (110) to charge the pulse receiving capacitors (82); the pulse receiving capacitors (82) discharge simultaneously when sufficient volt seconds have been applied to the nonlinear magnetic switch (76).

Abstract: An apparatus and method for measuring the orientation of an observer vehicle with respect to a radiative target. The apparatus comprises a gnomon, a radiation sensor assembly and conventional electronic hardware for measuring the output of the radiation sensor assembly. The radiation sensor assembly is divided into four quadrants each having an equal number of sensor element which emit a current in the presence of radiation. The individual currents from each respective sector are summed by said conventional electronic hardware to provide the orientation/angular relationship between the radiative target and the apparatus.

Abstract: An apparatus and method for providing self-checking voting logic for fault tolerant computing applications. The apparatus comprises a voting circuitry for producing a voting circuit output signal based upon a majority of triplicated logic output signals, unanimous circuitry for producing a unanimous circuit output signal that represents whether or not all of said triplicated logic output signal values are equal or not and self-checking circuitry for monitoring the validity of operation of the voting and the unanimous circuitry as well as said self-checking circuitry itself.

Abstract: An apparatus for aligning and terminating at least one optical fiber of a fiber optic cable within the fiber optic connector assembly aong a predetermined axis. The fiber optic connector comprises a rigid tubular body having a bore dimensioned for receiving the fiber optic cable, a central axis concentric with the predetermined axis, a split alignment sleeve having an outer dimension greater in dimension than the bore of the rigid tubular body, and a threaded alignment sleeve holder having a central aperture dimension for receiving the rigid tubular body and the compressible split alignment sleeve. The apparatus further includes a compression pin which is inserted into the forward end of the fiber optic connector to concetrically align and separate the fibers of the fiber optic cable.

Abstract: A simplified CMOS toggle flip-flop includes a flip-flop that has an input and an output, and a toggle circuit that includes an inverter having an input connected to the flip-flop output, a transfer switch connected between the inverter output and the flip-flop input, and a toggle control responsive to an input toggle signal for closing the transfer switch to connect the inverter output to the flip-flop input to transfer the inverted flip-flop output state to the flip-flop input. The transfer switch may include an NFET having its conduction path connected between the inverter output and the flip-flop input, and having a control gate. The toggle control may include a NAND gate having a first input for receiving a toggle pulse and a second input for receiving a timing pulse, and having an output. A second inverter has an input connected to the NAND gate output and an output connected to the NFET control gate of the transfer switch.