Abstract:
A micromechanical switch comprises a substrate, at least one pair of support members fixed to the substrate, at least one pair of beam members placed in proximity and parallel to each other above the substrate, and connected to one of the support members, respectively, each of the beam members having a moving portion which is movable with a gap with respect to the substrate, and a contact portion provided on the moving portion, and a driving electrode placed on the substrate between the pair of beam members to attract the moving portions of the beam members in a direction parallel to the substrate with electrostatic force so that the contact portions of the beam members which are opposed to each other are short-circuited.
Abstract:
The invention relates to a switch provided with self-cleaning contacts used, in particular for actuating a horn for a steering wheel of a motor vehicle. The inventive switch comprises at least two opposite contacts one of which is movable and touches the opposite contact by means of an actuating element. The self-cleaning of the contacts is carried out by the reciprocal sliding thereof, the contact associated with the actuating element is fixed to a supporting element which is embodied in such a way that it is elastic and fixed to an end, an opposite end being free and moveable. Said invention is characterized in that the supporting element from the fixing side outward has an inclined line with respect to the direction of actuation in the direction of said actuating element, and subsequently in the direction of the free end thereof. A line is also inclined in the direction of the free end thereof with respect to the direction of actuation starting from the actuating element.
Abstract:
A micromechanical switch comprises a substrate, at least one pair of support members fixed to the substrate, at least one pair of beam members placed in proximity and parallel to each other above the substrate, and connected to one of the support members, respectively, each of the beam members having a moving portion which is movable with a gap with respect to the substrate, and a contact portion provided on the moving portion, and a driving electrode placed on the substrate between the pair of beam members to attract the moving portions of the beam members in a direction parallel to the substrate with electrostatic force so that the contact portions of the beam members which are opposed to each other are short-circuited.
Abstract:
A micromechanical switch comprises a substrate, at least one pair of support members fixed to the substrate, at least one pair of beam members placed in proximity and parallel to each other above the substrate, and connected to one of the support members, respectively, each of the beam members having a moving portion which is movable with a gap with respect to the substrate, and a contact portion provided on the moving portion, and a driving electrode placed on the substrate between the pair of beam members to attract the moving portions of the beam members in a direction parallel to the substrate with electrostatic force so that the contact portions of the beam members which are opposed to each other are short-circuited.
Abstract:
In an elastic sheet member of the present invention, a silicon rubber sheet is supported by a fixed member. A wire group functioning as contacts is disposed at either one of the silicon rubber sheet or the fixed member. In other words, electrical continuity paths, which were conventionally provided at a printed circuit board, are basically provided at the elastic sheet member which is formed of a non-conductive material. In accordance with the present invention, there is no need for the printed circuit board to cover a range at which all rubber contacts are disposed, as in conventional art. Accordingly, the printed circuit board can be made compact, space required for placement thereof can be reduced, and degrees of freedom in design are increased.
Abstract:
An elastomeric switch is provided having self cleanings contacts. The switch includes a substrate and a switch actuator configured for reciprocating motion along an axis generally perpendicular to a surface of the substrate. A first switch contact, including a contact surface generally perpendicular to the actuator axis of motion is, carried by the switch actuator. A second switch contact is cantilevered from the surface of the substrate. Reciprocation of the actuator in a first direction toward the substrate acts to force the first contact against the distal end of the second contact. The two contacts are deflected together as result of further reciprocation of the actuator in the first direction. As the contacts are deflected, the distal end of the second contact is scraped across the contact surface of the first contact, thereby removing contaminants and other debris from the contact surface of the first contact. As the contacts are deflected, the second contact is mechanically biases against the first contact to eliminate contact bounce.
Abstract:
A computer keyboard employs a single monoblock structure to both support the keys and to define the aesthetic enclosure. The monoblock has multiple key supports into which key bodies are slidably mounted. The keyboard includes a switch membrane disposed on top of the monoblock and a dome sheet positioned on top of the switch membrane beneath the key bodies. The dome sheet has multiple resilient domes with openings formed therein to provide access for the key bodies to corresponding key supports. The domes support the key bodies and provide the "spring-like" feel during operation of the computer keys. The switch membrane has annular switch contacts positioned about the monoblock key supports beneath the domes. As one of the key bodies is depressed, the associated dome buckles and actuates the annular switch contact. The computer keyboard is low cost due to having only one structural component and is quiet due to the position of the rubber or elastomer dome sheet beneath the key bodies.
Abstract:
A click-action membrane switch unit comprises a flexible base film having two surfaces, flexible circuits formed on at least one of the two surfaces of the base film and having interdigitating electrode contacts, a resist film formed on the flexible circuits and having a window in the region of the electrode contacts, a dome-shaped click spring made of electrically conducting material and having an edge placed on the circuits, and a layer fixed to the other surface of the base film and having an opening formed in the portion of the layer which aligns with the click spring.
Abstract:
A keyboard switch assembly includes a thin, flexible, glass top layer forming a membrane. Disposed on an inner surface of the glass membrane is a first conductive layer forming an electrode. Disposed beneath the first conductive layer is an insulating layer or spacer having an aperture therein that defines a switch contact area. Beneath the spacer a rigid portion of the keyboard switch assembly is provided. The rigid portion of the keyboard switch assembly includes a rigid substrate with a conductive coating formed thereon to provide a second conductive layer or electrode disposed beneath the spacer. A flexible polymer layer may further be disposed between the rigid substrate and the second conductive layer to reduce point contact degradation in the keyboard switch assembly. Decorative paint layers may be formed on the inner surface of the glass membrane between the glass membrane and the first conductive layer. Alternatively, where the layers forming the keyboard switch assembly are transparent, a decorative paint layer may be disposed on an outer surface of the rigid substrate.
Abstract:
A keyboard has first and second nested planar members with depressions formed thereon. The upper member is transparent. The lower member may be color coded and carry replaceable key indicia in the depressions.The laminated overlay nested planar members are disposed adjacent to a conventional elastomeric diaphragm switch assembly having an upper layer of shaped protrusions abutting the lower most inner surfaces of the second or lower member depressions. Frame structure of variable form assists in retaining the laminated overlay members in fixed relationship to the elastomeric diaphragm switch assembly.