Abstract:
A contact element for high voltage direct current switches includes a matrix made of a first material selected from the group comprising copper, silver, palladium, platinum, tungsten, molybdenum, rhenium, nickel, gold, and alloys thereof. The contact element also includes a foreign phase, which is dispersed in the matrix and is made of a second material selected from the group comprising carbon, tin(II) oxide, tin(IV) oxide, zinc(II) oxide, tungsten, nickel and mixtures thereof. The contact element has a porosity of ≦1.0% by volume, based on a total volume of the contact element.
Abstract:
In a conductive sheet using a metal nanofiber, metal migration in a visible conductive pattern is eliminated. Also, the intervals of the conductive portion (separate sheet terminal) are shortened. On a substrate (26) is a conductive sheet (10), formed from a transparent conductive pattern (11) and a visible conductive pattern (16). The transparent conductive pattern comprises a first nanofiber layer (12) that is a layer including a metal nanofiber, and a first heat-insulating layer (29) adjacent to the first nanofiber layer. The visible conductive pattern (16) forms an underlayer pattern from a second nanofiber layer (17) that is a layer including a metal nanofiber, and a second heat-insulating layer (27) adjacent to the second nanofiber layer; and a top-layer pattern comprising a paste layer (18) that is a layer including a metal paste laminated on the underlayer pattern. The second heat-insulating layer (27) is a conductive sheet that is a layer including a metal nanofiber cut to a minimum size. The visible conductive pattern (16) forms a water-shielding layer (21) on the underlayer pattern, and forms the top-layer pattern on the water-shielding layer.
Abstract:
In a push-button switch member provided with a movable contact composed of a metal member 7 constituting a contact surface to an opposing electrode 4, a number of holes 6 are formed to the contact surface in the height direction thereof, and the holes 6 are filled up with a filler 8 formed of a flexible resin.
Abstract:
A membrane switch that suppresses the growth, or migration, of metallic ion crystals caused by condensation. First and second metallic conductive layers are provided on an inside of the first and second resin film, respectively. First and second non-metallic conductive layers cover the first and second metallic conductive layers, respectively. A spacer separates the first and second metallic conductive layers and includes an inner wall that, together with the first and second metallic conductive layers, defines a spacer cavity. At least one of the first and second metallic conductive layers is located a prescribed distance from the spacer inner wall, as the spacer inner wall provides a pathway for the metallic ion crystal migration.
Abstract:
A membrane switch having a pair of flexible printed boards and a pair of contacts respectively disposed on said printed boards. The contacts are formed of powdered alloy of silver and palladium bounded by resinous material, and a conductive layer of silver powder is disposed between the flexible printed board and the contact. Preferably, the powdered alloy contains 50-97 weight percent silver and palladium in the remainder of weight percent.
Abstract:
In order to produce keyboards, two pairs of diagonally connected squares with rounded corners are used as fixed contacts. A direct diagonal connection electrically connects two non-adjacent squares. The squares are conductive lacquer (carbon lacquer) and cover copper pads on a printed circuit board.
Abstract:
An autoclavable electrical switch assembly for use with a medical device having electrical functions comprising a flexible substrate formed of an insulating material and having a first and second surfaces, and having outer margins, first conductive means adherent to the first surface and forming a pattern surrounding an area of the surface and a contact disposed within the area, second conductive means adherent to the second surface and forming a ground plane and at least one, feedthrough means forming a connection between the contact on the first surface and the ground plane on the second surface, a snap dome of a conductive material overlies the contact and engages the pattern surrounding the area, flexible cover means disposed over the first and second surfaces and means for forming a hermetic seal between the outer margins so that the dome is hermetically sealed, said cover means and said hermetic seal being capable of withstanding repeated autoclaving.
Abstract:
The membrane keyboard assembly comprises upper and lower membrane keyboards, a spacer interposed therebetween and a common flexible base including two half portions associated with the upper and lower membrane keyboards. The flexible base has silver paint contact areas and connection lines printed thereon and the silver paint connection lines have gaps at spaced points along their length. Resistive layers are applied on the contact areas and connection lines including the gaps therein so that suppression resistances in series connected across the connection lines are formed. The resistance value of the suppression resistances can be varied by suitably selecting the length and width of the connection lines.
Abstract:
A switching device having a movable contact element characterized by a set of unconnected, curved slots radiating outward from a central key area and equally spaced around the central key area. The radially extending unconnected, curved slots may be sections of a spiral, at least some of which sections overlap each other. Adjustment of the spring rate of the movable contact element is accomplished by adjusting the length of the slots or by regulating the distance of the inner terminus of the slots from a central point of the central key area. The movable contact element either contacts a second contact element for contact switching or approaches the second contact element for capacitive switching.A plurality of the switching elements can be formed in a planar array on a continuous metallic substrate to provide a keyboard. The movable switching elements can be formed on the metallized areas of a printed circuit board.
Abstract:
In a matrix of switches disposed in rows and columns, a plurality of first discrete conductors are deposited on the surface of a first backing member to extend in a first direction and a plurality of second discrete conductors are deposited on the surface of a second backing member to extend in a second direction. Dielectric spacing means is disposed between the first and second backing members to maintain the first and second conductors in a normally spaced relationship. The spacing means defines a plurality of openings each extending between an associated pair of the first and second conductors which define one of the switches. By pressing the associated pair of conductors into relative engagement through the associated opening in the spacing means, a signal on the associated first conductor is switched to the associated second conductor. The second conductors can extend through a pair of the switches and can be bisected therebetween to increase the number of discrete switches in the matrix without increasing the number of conductors. A bar clamp provides an interface between the switches in the matrix and the electronics associated with the controlled operations. A method for making the matrix of switches includes the steps of providing a spool for each of the backing members, the conductors, and the spacing means, and guiding the conductors and the spacing means in a spaced relationship onto the backing member. This process can be performed at high speed with inexpensive materials to significantly reduce the cost of manufacturing the matrix of switches.