Abstract:
A PHOTOMASK HAS MULTILAYER OPAQUE PLATTERNS ON A TRANSPARENT SUBSTRATE. EACH PATTERN INCLUDES A BOTTOM LAYER AND A TOP LAYER, EACH OF A MATERIAL CAPABLE OF BEING ETCHED BY A SUBSTANCE WHICH WILL NOT ETCH THE SUBSTRATE, AND AN INTERMEDIATE LAYER OF A MATERIAL CAPABLE OF BEING ETCHED BY A SUBSTANCE WHICH WILL NOT ETCH THE BOTTOM AND TOP LAYERS. THE SEVERAL LAYERS COMPENSATE FOR DEFECTS IN EACH LAYER. AN IMPROVED PHOTOMASK FABRICATION METHOD INCLUDES FORMING THE ABOVEMENTIONED PATTERNS BY SUCCESSIVELY DEPOSITING THE BOTTOM AND INTERMEDIATE LAYERS, PHOTOETCHING THE INTERMEDIATE LAYER INTO A DESIRED PATTERN, DEPOSITING THE TOP LAYER, AND THEN PHOTOETCHING THE TOP AND BOTTOM LAYERS INTO A DESIRED PATTERN.
Abstract:
A novel method of making a heat pipe having an easily contaminated internal wetting surface, comprising cleaning the surface and then coating the cleaned surface with a material that is soluble in the working fluid at an operating temperature of the heat pipe. For a heat pipe employing a mercury metal working fluid, easily-oxidized ferrous metal surfaces of the capillary structure and envelope inner wall may be coated with nickel.
Abstract:
A bidirectional gate controlled device, such as a triac, is connected in circuit with a time constant circuit, an AC source, and a load. The time constant circuit is adapted to charge only when the AC source is of a given polarity; its discharge duration being sufficient to provide a triggering signal to the gate of the device to trigger it into consecutive conduction in both of its conducting directions.
Abstract:
A two input OR gate with resistive feedback between the output terminal and one of the input terminals of the OR gate. The second input terminal of the OR gate serves as s the set input terminal to the flip-flop and is normally maintained at a level indicative of a binary '''' 0'''' . To set the flip-flop, a voltage indicative of a 1 is momentarily applied to this set terminal. To reset the flip-flop, a voltage indicative of a zero is momentarily applied to the reset terminal of the flip-flop. The latter is coupled through a level shift circuit, including active element means, to the first input terminal of the OR gate.
Abstract:
A special effects generator employs an electronic switch controlled by a comparator which operates to provide a series of pulses of varying durations to control the switch in a manner to produce a single video signal containing a plurality of different video signals to be displayed simultaneously in an iris display. A feedback scheme permits the comparator to provide greater selectivity for enabling the generator to provide smaller diameter iris displays.
Abstract:
The object it is desired to position has areas thereon whose peripheral edges are boundries between light and dark regions. For example, the areas may be metal electrodes which appear light and are located on a dark substrate. This object is placed beneath a light-sensing element such as an optical fiber. The object is then scanned in different directions under computer control, by producing relative movement between it and the lightsensing element to ascertain the shapes of a number of these areas, and the position within each such area of a characteristic point such as the center of gravity or the center of one particular edge, of each such area. The coordinates of these points are compared with reference coordinates previously stored in the computer memory for calculating the translational and/or the rotational movement required to center the object and for imparting this movement to the object.
Abstract:
The contacts of a semiconductor device are connected to the terminals of a package for the semiconductor device through metal interconnecting strips. The strips are formed on the surface of a plate from which the strips can be easily pulled away. The semiconductor device is seated on the plate with each contact of the semiconductor device engaging a separate one of the strips and the semiconductor device contacts are bonded to the strips. The terminals, which are connected to a frame, are placed in contact with and bonded to the strips. The assembly of the terminals, interconnecting strips and semiconductor device is then removed from the plate. A package is formed around the assembly with the terminals projecting from the package.
Abstract:
METHOD FOR AUTOCATALYTICALLY ELECTROLESSLY PLATING A DIELECTRIC SURFACE WITH A METAL SUCH AS NICKEL, COBALT OR COPPER COMPRISING SENSITIZING THE SURFACE WITH AN IMPORVED SENSITIZING SOLUTION COMPRISING BOTH DIVALENT TIN ION AND TETRAVALENT TIN ION, THE SOLUTION HAVING A PH LESS THAN ABOUT 1.5, TREATING THE SENSITIZED SURFACE WITH A CATALYZING SOLUTION TO PROVIDE CATALYTIC NUCLEATING CENTERS, AND PLATING THE METAL ON THE CATALYZED SURFACE. THE IMPROVED SENSITIZING SOLUTION PERMITS PLATING ON SMOOTH, DENSE, WATER REPELLENT PLASTIC SURFACES SUCH AS TEFLON, LUCITE, SILICONE RUBBERS AND MYLAR.
Abstract:
A tape player apparatus includes a capstan utilized to drive a magnetizable medium past a transducing head. A flywheel is rotatably mounted to the capstan which is adapted to be rotated at two different speeds. The flywheel is driven at a first rotational velocity which is coupled to the capstan by a releaseable securing means. Means are provided for driving the capstan at a different, greater, rotational velocity. The releaseable securing means releases the capstan from the flywheel for independent rotation when the capstan is driven at the second rotational velocity.
Abstract:
An integrated circuit chip having circuit elements capable of relatively high power operation is encapsulated in a body of polymeric material having the form of an elongated rectangular prism. Conductors are electrically coupled to the elements in the integrated circuit chip and extend outwardly of the body of polymeric material through its relatively long sides. Heat conductors thermally coupled to the integrated circuit chip extend outwardly of the package through the same sides as the electrical conductors and are adapted to couple the integrated circuit chip to an external heat dispersing means.