Abstract:
A low profile electromechanical keyboard switch, displaying very low electrical bounce. The switch key top bears against a generally cylindrical plunger which has a depressed flat portion on its side engageable with a tactile ball biased by a spring nested in the switch housing. Upon application of a force to the key top which exceeds a threshold value, the tactile ball is displaced from the flat and over the shoulder defined between the depressed flat and the cylindrical portion of the plunger. Sudden, positive movement of the plunger against an underlying contact leaf ensues. The contact leaf is branched into multiple contact fingers, and arranged with respect to an underlying contact plate so that wiping contact occurs between fingers and plate. The switch housing is configured to carry sufficient diodes and resistors to assure full control and encoding functions in the keyboard in which such switch may be mounted.
Abstract:
A unitized configuration including plurality of key top switches. A single unit shell overlies and is secured to a circuit board upon which the contact leafs for the various switches are so mounted as to be cantilevered over their respective printed contacts. The plungers associated with the several key tops pass through openings in the shell and are biased out of contact with the underlying cantilevered leafs by spring means. Depressing of the key tops drives the plungers downward to deflect the respective contact leafs and close the associated circuits.
Abstract:
A reflecting-type fly''s eye lens array is described having extremely high resolution capabilities. By means of photoresist techniques, a first array of similar reflecting surfaces are formed on each of a first multitude of substantially identical curved surfaces of a transparent medium and a second array of similar reflecting surfaces are formed on each of a second multitude of substantially identical curved surfaces of a transparent medium. The surfaces of the two multitudes are aligned with each other in one-to-one relationship so that each curved surface of the first multitude has a common optical axis with a corresponding curved surface of the second multitude. In addition, the reflecting surfaces of the first and second arrays are shaped in the characteristic ring and dot patterns of a Cassegrain or Gregorian lens; and the curvatures of the reflecting surfaces are selected such that electromagnetic radiation incident upon each ring-shaped reflective surface is reflected to the corresponding dot-shaped reflective surface. As a result, a multitude of small reflecting lenses are formed having an extremely high resolution that permits the fabrication by photoresist techniques of elements having submicron dimensions.
Abstract:
A low profile keyboard unit including an etched circuit board and a plurality of keyboard switches mounted on one surface thereof. Individual switches include housings configured to carry in self-contained fashion up to ten diodes plus a resistor, the leads from these elements being passed through holes in the board and flow soldered at the back side of the board.