Abstract: A high resolution optical lithographic system for exposing 0.25 microns to 0.5 microns linewidths on integrated circuit substrates. The system comprises a deep ultra-violet (UV) source of illumination in conjunction with an optical condenser system and high reduction ratio optical projection system and a deep UV sensitive photoresist. A three-slit interferometric sensor may be used to provide the resolution required to automatically focus the system.

Abstract: A stable alignment mechanism for laser mirrors has a resilient diaphragm integrally formed between a base and a support for the laser mirror. An adjusting screw or screws rotate the support with respect to the base to align the mirror.

Abstract: An imaging system in which the line of sight defined by the spatial position of optical and detector elements in such system is movable in a first axis by a signal which is used to modulate a bias or mid position of a scanning mirror included in such optical elements and in a second axis by modulating the time delay between video information of the scene imaged and the synchronization pulses used for display in the direction of such second axis.

Abstract: An opto-mechanical scanning system in which a counterbalancing mechanism is placed in a remote location from and on a different plane than the scanning mirror, thereby minimizing the effect of system spatial constraints which would normally preclude adequate counterweighting.

Abstract: An improved boiler purge control in which purging air is forced into the boiler only after the damper is substantially in its high fire position.

Abstract: A thermal reference source which includes a blackbody element and which is capable of being either heated or cooled based on a measured temperature of a scene of interest of an infrared system.

Abstract: A reserve battery having a plurality of galvanic cells and a series of ports through which electrolyte can flow into the cells. A spring activated valve opens the ports during periods of angular acceleration of the battery and closes the ports when there is no acceleration.

Abstract: A driver circuit in which a signal received at an input gate provides, at the output of the circuit, a signal having fast rise and fall times and high voltage swings. The input stage of the circuit includes two transistors coupled in a complementary emitter follower arrangement and the output stage of the circuit includes two transistors in a complementary common emitter amplifier arrangement. The circuit includes separate high speed and low speed signal paths.

Abstract: A thermostat with a single control to establish the quantity of set back during heating and set up during cooling.

Abstract: Opto-mechanical scanning of a scene of interest is provided by use of an unequal four-bar linkage assembly which simultaneously rotates and translates a scan mirror, thereby minimizing the size of the optical window, the size of the scan mirror, and the working space required by the scan mirror.

Abstract: A combustible gas analyzer for determining the Wobbe Index of a combustible gas uses a constant pressure combustible gas supply and constant flow rate air supply to provide oxygen and gas for combustion. The air is supplied directly to be mixed with the combustible gas while the gas is passed through a variable orifice or valve before mixing with the air supply. A zirconium oxide detector is arranged to measure the oxygen content of the combustion products to enable a predetermined oxygen level to be reached. The valve is operated by a valve control response to the output of the zirconium oxide detector to maintain the preset oxygen level. The position of the valve is monitored as a representation of the Wobbe Index of the combustible gas.

Abstract: An evaporated thin-film platinum resistance thermometer interleaved with a nichrome heating element on a sapphire substrate so as to calibrate infrared detectors and allow accurate control of the output signals of such detectors.

Abstract: A delay circuit in a conventional D type flip-flop circuit sets a flip-flop to a predetermined logic state in the event of an internal circuit failure.

Abstract: A programmable signal equalizer uses a plurality of active RC circuits arranged to be controlled by a ladder resistor network. The resistor ladder circuits are selected by digital word signals representative of the selected magnetic tape speed to produce a signal equalization operation at each of the selected tape speeds. A combination of the ladder network circuits is selected by the digital bits in the digital word to form an active RC circuit producing a signal equalization correlated to a selected tape speed. Using an eleven line digital word code and an eleven RC ladder, eight master speed equalizations are selected as well as seven equalizations between the master speeds for a total of sixty-four equalization functions.

Abstract: A terminal block connector uses a first nut having an internal thread of a first diameter and type and a second nut coaxially arranged therewith having an internal thread of a second diameter and type. To further the universality of the connector, the first thread may be an SAE thread while the second thread may be a metric thread, while the first diameter is always smaller than the second diameter. The first nut is arranged to cooperate with a first diameter machine screw while the second nut is arranged to cooperate with a second diameter machine screw. The two nuts are held rotationally captive in a coaxial recess in an electrically insulating block with the larger thread diameter second nut located at the entrance to the recess. The smaller thread diameter first nut is initially positioned beneath the large diameter second nut and in frictional engagement with the wall of the recess with a space between the first nut and the bottom of the recess.

Abstract: A mounting means for apparatus useful for processing infrared signals including a pyroelectric detector array with a plurality of detector elements, a plurality of electrically conductive epoxy polymer mounting means having two ends and attached at one end to the detector array to provide individual electrical contact for each of the detector elements. The apparatus further includes circuit means attached to the other end of the mounting means for processing electrical signals from the array.

Abstract: A demand defrost system in which a high resistive epoxy resin hermetically seals a capacitive sensor plate and a noise immune phase detector detects a phase shift caused by the build up of frost.

Abstract: A butterfly valve having a valve body and a valve disc which is rotated to produce an engagement with a peripheral edge of the disc and an annular seat or wall defined by a portion of an internal fluid passage in the valve body uses a seal ring member mounted in an annular groove in the valve body adjacent to the annular seat. The seal ring member includes a pair of bowed seal rings arranged in a "V" within a triangular shaped annular recess in the wall of the fluid passage in the valve body. One side, i.e., an inner side, of each of the seal rings projects from the triangular recess to contact the edge of the valve disc to form a fluid-tight seal in response to fluid pressure acting on a convex face of a seal ring to flatten the seal ring. The other side of each of the seal rings contacts a respective corner of the recess with the convex faces of the seal rings facing each other.

Abstract: A multi-point recorder has a multi-color ink cartridge arranged to be selectively aligned with a recording head having a plurality of selectively energizable recording elements whereby a color from the multi-color ink cartridge is selected for printing by the recording elements. The recorder can either be operated in a fixed color operation by maintaining a preselected alignment of the recording head and a desired color in the multi-color ink cartridge or the color of the recording can be selectively altered at any time to produce a multi-color recording by selecting a corresponding color from the multi-color ink cartridge and aligning the recording head therewith for each recording. A drive mechanism having a single drive motor for the ink cartridge and the recording head is used to align the ink cartridge with the recording head along a recording line on a recording medium and to position the recording head and the ink cartridge at a printing location on the recording line.

Abstract: A direct current motor having pole pieces in the shape of partial cylinders each having an inner surface terminating in a leading and trailing edge. A series of notches are formed along the edges of the pole pieces so that each of the edges alternately slopes toward and away from the center of the inner arc surface of the pole piece.