An element includes an upper electrode, a flexible intermediate layer, and a lower electrode. The upper electrode having an uneven structure. The lower electrode is closely attached to the intermediate layer. The element is configured to generate an electrical signal due to contact and separation between the upper electrode and the intermediate layer. The lower electrode is configured to take a shape fittable to the uneven structure when the upper electrode and the intermediate layer come into contact with each other.

A vacuum variable capacitor includes a pre-vacuum enclosure for reducing a pressure differential across the bellows, wherein a drive is disposed outside the enclosures of the vacuum variable capacitor. The vacuum force load on the drive system can thereby be reduced, allowing faster movement of the movable electrode, faster capacitance adjustment of the vacuum variable capacitor and longer lifetimes of the device.

A variable capacitor includes an enclosure having first and second conductive collars separated by an intermediate electrically insulating element. A movable capacitor plate assembly is electrically coupled to the first conductive collar, and a fixed capacitor plate assembly is electrically coupled to the second conductive collar. An actuator extends into the enclosure for advancing and retracting the movable capacitor plate assembly relative to the fixed capacitor plate assembly. A hermetically sealed volume within the enclosure contains a dielectric fluid serving as a dielectric between a capacitor plate of the movable capacitor plate assembly and a capacitor plate of the fixed capacitor plate assembly. A flexible structure is provided to contain the dielectric fluid displaced when the movable capacitor plate assembly is advanced toward the fixed capacitor plate assembly.

A variable-capacitance capacitor having first and second electrodes mobile with respect to each other and third and fourth electrodes insulated from the first and second electrodes, capable of receiving a control signal to vary the relative position of the first and second electrodes in order to vary the capacitance between the first and second electrodes, the capacitor further including a system for controlling the position of the second electrode with respect to the first electrode, the system being arranged so that, for at least one relative position of the second electrode with respect to the first electrode, the position of the second electrode with respect to the first electrode is independent from the voltage between the first and second electrodes.

According to the present invention there is provided a capacitor (100, 200,900,120,150,300) comprising, a flexible strip (1,50,60,110,130,260) comprising a first region (2a) having a plurality of nodules (5,61,261,262) and a second region (2b) having a plurality of nodules (5,61,261,262), and wherein the strip further comprises a first flexible portion (3a) which is interposed between the first and second regions (2a,b), and wherein the flexible strip (1,50,60,110,130,260) is folded at the first flexible portion (3a) so that, the first and second regions (2a,b) overlay one another and the nodules (5,61,261,262) of the first region (2a) extend in a direction towards the second region (2b), and the nodules (5,61,261,262) of the second region (2b) extend in a direction towards the first region (2a), and wherein the flexible strip (1,50,60,110,130,260) comprises electrically conductive material; and a flexible foil (20, 80,140) which is arranged to be interposed between the first and second regions (2a,b), and wherein the foil (20, 80,140) comprises electrically conductive material. There is further provided a corresponding method of manufacturing said capacitor.

According to the present invention there is provided a capacitor (100, 200,900,120,150,300) comprising, a flexible strip (1,50,60,110,130,260) comprising a first region (2a) having a plurality of nodules (5,61,261,262) and a second region (2b) having a plurality of nodules (5,61,261,262), and wherein the strip further comprises a first flexible portion (3a) which is interposed between the first and second regions (2a,b), and wherein the flexible strip (1,50,60,110,130,260) is folded at the first flexible portion (3a) so that, the first and second regions (2a,b) overlay one another and the nodules (5,61,261,262) of the first region (2a) extend in a direction towards the second region (2b), and the nodules (5,61,261,262) of the second region (2b) extend in a direction towards the first region (2a), and wherein the flexible strip (1,50,60,110,130,260) comprises electrically conductive material; and a flexible foil (20, 80,140) which is arranged to be interposed between the first and second regions (2a,b), and wherein the foil (20, 80,140) comprises electrically conductive material. There is further provided a corresponding method of manufacturing said capacitor.

A variable-capacitance capacitor having first and second electrodes mobile with respect to each other and third and fourth electrodes insulated from the first and second electrodes, capable of receiving a control signal to vary the relative position of the first and second electrodes in order to vary the capacitance between the first and second electrodes, the capacitor further including a system for controlling the position of the second electrode with respect to the first electrode, the system being arranged so that, for at least one relative position of the second electrode with respect to the first electrode, the position of the second electrode with respect to the first electrode is independent from the voltage between the first and second electrodes.

A ring electrode to determine the orientation of the stylus relative to the surface. The stylus can include a ring electrode configuration which can improve capacitive coupling between the ring electrode and the touch panel. The ring electrode configuration can include a ring electrode and ground ring, and ground plate. By varying the lengths of ring electrode, ground ring, ground plate, and the distance between these elements, the electric field emanating from the ring electrode can be tuned to optimize the capacitive coupling between the ring electrode and surface. In some examples, the ring electrode can include multiple sub-rings. In some examples, the ring electrode can comprise a crown shape including projections, each having a width that tapers to a minimum width along the length of the ring electrode.

A capacitance value fast-placing vacuum capacitor includes: a housing, a first electrode group and a second electrode group. A vacuum chamber is provided in the housing. The first electrode group and the second electrode group are mutually coupled and accommodated in the vacuum chamber. An electromagnetic drive mechanism is mounted on the outer side of one end of the housing. The electromagnetic drive mechanism is capable of driving the first electrode group to shift relative to the second electrode group, the vacuum capacitor is switched between two capacitance value states. In the capacitance value rapid-switching vacuum capacitor, the electromagnetic drive mechanism is configured for rapidly adjusting and switching capacitance values of the vacuum capacitor, the capacitance value switching time of the vacuum capacitor is within one hundred milliseconds, thus meeting the requirement of an application device of the vacuum capacitor for rapid matching of an impedance matcher.

A vacuum variable capacitor includes a pre-vacuum enclosure for reducing a pressure differential across the bellows. The vacuum force load on the drive system can thereby be reduced, allowing faster movement of the movable electrode, faster capacitance adjustment of the vacuum variable capacitor and longer lifetimes of the device.