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:
A two-dimensional coordinate detecting apparatus for use, e.g. over a CRT screen, is arranged such that a potential gradient layer is spaced from a detector layer, one of which is formed of a plurality of fragmentary strips. At a depressed position, the potential gradient layer and the detector layer come into contact, and the coordinates of the depressed position can be detected, by, for example, the potential at the depressed portion, or from factors such as the timing of the voltage detection.
Abstract:
There is disclosed a click disc switch assembly comprising a plate-like base having on it electroconductive ink paths including (a) "row" paths each including a respective row of contact pads in a row-and-column matrix of such pads on the base, and (b) "column" paths corresponding to the columns of the matrix and including respective junction pads. Overlying the columns of the matrix are click disc strips secured to the rest of the assembly solely by being adhered to an overlying sheet sealing the top of the assembly. Interposed between the strips and the "row" paths is an insulating layer deposited on the base to cover portions of the row paths while leaving uncovered their junction pads. Each click disc is electrically coupled to the corresponding "column" path on the base by the coming into contact of the disc when depressed to branch segments of a further electroconductive ink path (one for each click disc strip) deposited on the insulate layer and attached through an aperture therein to the junction pad of that "column" path. Variations in the thickness of the paths on the base and on the layer are cancelled out by depositing on the base, below the click discs, pairs of bars of the same thickness as the lead portions of the paths on the base, and by raising the contact pads by an amount equal to the thickness of the paths on the layer. The base is a laminar member comprising an overlying flexible plastic sheet adhered to an underlying stiffening board. The assembly may include a tail for connecting it to other circuitry.
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:
An electromagnetic relay includes a fixed contact module including a fixed contact, a movable contact module including a movable contact disposed to face the fixed contact, an armature formed of a magnetic material and configured to move the movable contact module to bring the movable contact into and out of contact with the fixed contact, and an electromagnet configured to generate a magnetic field to move the armature. At least one of the fixed contact module and the movable contact module includes a joint at which different components are joined by riveting, and a film with a thermal conductivity higher than, the thermal conductivity of the fixed contact module and the movable contact module is formed on at least one of the fixed contact module and the movable contact module including the joint.
Abstract:
An actuator is provided for creating an electrical contact between two tracks of a printed circuit board. The actuator includes a polymer part, forming an arm including one contact end and one end for setting in motion; and a metal part, fixedly attached to the contact end, having a general shape of a cap.
Abstract:
A high-voltage multipolar circuit breaker including a first chamber for receiving gases, in communication with a first arc quenching chamber, and including a first aperture for exhausting gases to the exterior of the casing, the aperture being provided with a first downstream filtering device. The circuit breaker furthermore includes at least one second chamber for receiving gases, in communication with at least one second arc quenching chamber of another pole of the circuit breaker, the chamber itself being equipped with a second upstream device for filtering gases, the second chamber for receiving gases including a second aperture for exhausting gases to the exterior of the casing, the chamber being provided with a second downstream filtering device, the first chamber for receiving gases and the second chamber for receiving gases being separated fluidically one from the other by an impermeable wall.
Abstract:
An actuator is provided for creating an electrical contact between two tracks of a printed circuit board. The actuator includes a polymer part, forming an arm including one contact end and one end for setting in motion; and a metal part, fixedly attached to the contact end, having a general shape of a cap.
Abstract:
A conductive tracing for a keyboard including a pair of electrically conductive paths that are electrically isolated from each other. The pair of electrically conductive paths may each include conductive surfaces that are electrically coupled together. Each of the plurality of conductive surfaces of the pair of electrically conductive paths extend radially between a center portion and a peripheral portion of the conductive tracing. One or more of the conductive surfaces may include a pair of outer edges that are substantially parallel to a respective radial direction that the outer edges extend in. The conductive surfaces of one of the pair of electrically conductive paths may be complementary formed to the conductive surfaces of another of the pair of electrically conductive paths. The conductive tracing may be substantially symmetric about an axis that passes through the center portion of the conductive tracing.
Abstract:
There is disclosed a click disc switch assembly comprising a plate-like base having on it copper foil paths including (a) "row" paths each including a respective row of contact pads in a row-and-column matrix of such pads on the base, and (b) "column" paths corresponding to the columns of the matrix and including respective bonding pads. Overlying the columns of the matrix are click disc strips having end tabs welded to the bonding pads. Interposed between the strips and the "row" paths is an originally liquid and subsequently solidified coating deposited on the base to cover portions of the row paths while leaving uncovered their contact pads. The base and the strips include holes used to align the latter on the former.