A membrane switch in which a first conductive part is formed on a first substrate, a second conductive part is formed on a second substrate, and the substrates are layered via a spacer such that the conductive parts face each other with a space therebetween, and an organic material showing piezoelectricity is filled, or disposed in the space such that an air gap is present, are useful for obtaining an output signal corresponding to an applied pressure.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.

A soft-rubber keyboard having hard sheets with convex switches includes: a printed circuit film, a keyboard base plate for supporting the printed circuit film, an integrated soft-rubber keycap and a plurality of hard sheets. The integrated soft-rubber keycap includes a plurality of key units. The key unit is formed by connecting a soft-rubber key surface, a soft-rubber supporting body and a soft-rubber key base. Each key unit corresponds to one hard sheet. A convex switch body is downwardly integrated with the center of the hard sheet. The hard sheet is bonded to via an adhesive or integrally formed by injection molding with the bottom surface of the soft-rubber key surface. The convex switch body in the center of the hard sheet corresponds to a circuit switching point of the printed circuit film. The soft-rubber keyboard has the characteristics of simple processing, low cost, simple assembling and good press stability.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.

A transmitter device incorporating a strain gauge proportional push button is disclosed. The transmitter device includes a printed circuit board including one or more electrical components thereon and a proportional push button having a flexible membrane, a dome switch positioned beneath the flexible membrane and attached to the printed circuit board, the dome switch being proximate to the flexible membrane such that depression of the flexible membrane causes the dome switch to snap down and thereby form a closed circuit in the dome switch, and a strain gauge formed on or applied to the printed circuit board and positioned adjacent the dome switch, the strain gauge generating an electrical output proportional to an amount of deflection of the printed circuit board caused by pressure exerted thereon by depression of the flexible membrane and the dome switch.

A low profile keyboard backlight module includes an electrically insulative bottom membrane layer, an intermediate membrane layer including a conducting layer, an insulative layer and a light-emitting layer attached together through lamination and bonded to the top surface of the bottom membrane layer, and an electrically insulative top membrane layer bonded to a top surface of the intermediate membrane layer opposite to the bottom membrane layer and having an integrated elastic layer located at a top surface thereof to support a set of keys. Thus, the low profile keyboard backlight module provides optimal waterproof effects and is practical for use in an electronic product having light, thin, short and small characteristics.

A keyboard device includes an upper housing, a conductive membrane, a key top including a bottom surface and an actuator disposed on the bottom surface, a lower housing and a soft elastic element located on the conductive membrane, wherein the actuator penetrates the upper housing, and the soft elastic element has an engaging part to engage with the key top such that the key top is prevented from being separated from the soft elastic element when the key top rebounds.

A key structure is provided. The key structure comprises a substrate, a membrane circuit disposed on the substrate, a conduction switch disposed on the membrane circuit, a keycap, a bending portion fixed to the keycap, an elastic member disposed on the membrane circuit and abutting against the keycap, and a connecting rod disposed movably between the membrane circuit and the keycap. The connecting rod includes an operating arm and an engaging portion. The operating arm is connected to the engaging portion, and the engaging portion selectively engages with the bending portion. When the operating arm moves in a direction parallel to a surface of the keycap, the operating arm drives the engaging portion to disengage from the bending portion and the elastic member provides a force against the keycap to move the keycap away from the conduction switch.

A pressure sensitive switch device includes a first membrane, a first conductive wire, a second conductive wire, a second membrane, a pressure sensitive layer, a supporting plate, and an elastic body. The second conductive wire is disposed on the first membrane and separated from the first conductive wire. The pressure sensitive layer is disposed on the second membrane and contact to the first conductive wire and the second conductive wire. The first conductive wire is electrically connected to the second conductive wire by the pressure sensitive layer. The supporting plate is located below the first membrane and has a groove. The elastic body is located over the pressure sensitive layer. The elastic body includes a deformation portion and a protruding portion. The deformation portion is configured to generate deformation to drive the protruding portion to move.

A pressure module comprises a substrate, a support structure and a pressing membrane. The support structure is connected to the substrate and the pressing membrane to form an accommodating cavity between the substrate and the pressing membrane. An electrode is disposed on a surface of the substrate or the pressing membrane and a variable resistance layer is respectively disposed on the opposite surface of the other of the substrate and the pressing membrane. On application of pressure to the pressing membrane, the pressing membrane is elastically deformed and the variable resistance layer is brought into contact with the electrode to form a contact area and a resistance value between the variable resistance layer and the electrode. The contact area and the elastic deformation is positively correlated.