Abstract: A pen type coordinate indicator for a position input device is provided, which is capable of widening a detection range of a pressing pressure (pen pressure) while preventing erroneous (false) detection. A coil spring (i.e., a first elastic body) and a silicon rubber (i.e., a second elastic body) are interposed between an end surface of a first ferrite core, around which a coil connected to a resonance circuit is wound, and an end surface of a second ferrite core, within the pen. The first and second elastic bodies operate to controllably change (narrow) the distance between the two end faces in accordance with the pressure applied to the pen tip. As a result, an inductance value of the coil wound around the first ferrite core is controllably changed and thus a phase (frequency) of an electric wave transmitted from the resonance circuit to a position detector is controllably changed.

Abstract: A position pointer is provided, which includes a housing having an opening, a bar-like rod disposed in the housing such that one end thereof projects from the opening, and a variable capacitor having a capacitance value which varies in response to pressure applied thereto through the rod. The capacitor includes a dielectric member having a first face portion opposite a second face portion, a first electrode section disposed on the first face portion of the dielectric member, a conductive member facing the second face portion of the dielectric member and forming a second electrode section when brought into contact with the second face portion of the dielectric member, and an elastic member coupled with the conductive member and adapted for biasing the conductive member away from the second face portion. A contact area between the conductive member and the second face portion varies depending on the pressure applied thereto through the rod.

Abstract: A variable capacitor is provided for use with an electronic circuit board including a first terminal portion and a second terminal portion, to be built in a position indicator. The variable capacitor includes a dielectric having a first surface portion and a second surface portion opposite to the first surface portion, and a conductive elastic member having a board coupling portion and a dielectric contacting portion. The first terminal portion is coupled to the first surface portion, the second terminal portion is coupled to the board coupling portion, and the dielectric contacting portion is disposed separately from the second surface portion so as to face the second surface portion and is configured to be deformed to come in contact with the second surface portion of the dielectric.

Abstract: A variable capacitor is disclosed, including: a dielectric having a first surface and a second surface opposing the first surface; a first electrode disposed on the first surface of the dielectric; a second electrode disposed to face the second surface of the dielectric; and a pressing member configured to cause the second electrode and the dielectric to contact each other when a pressing force is applied thereto (e.g., when a pen-shaped position indicator including the variable capacitor is pressed against a tablet). In the variable capacitor, the second electrode includes at least one electrode piece having an abutting central portion, against which the pressing member transmits a pressing force applied thereto, and an extension portion that radially extends from the abutting central portion toward a circumferential portion of the dielectric.

Abstract: A nitride semiconductor device includes a first nitride semiconductor layer having a C-plane as a growth surface, and unevenness in an upper surface; and a second nitride semiconductor layer formed on the first nitride semiconductor layer to be in contact with the unevenness, and having p-type conductivity. The second nitride semiconductor layer located directly on a sidewall of the unevenness has a p-type carrier concentration of 1×1018/cm3 or more.

Abstract: A position-detecting device detects a position pointed to by a position-pointing instrument and includes an operation panel detecting the position pointed to by the position-pointing instrument; and a manipulation-detecting unit located at at least one of the interior and the exterior of the operation panel, and detecting a manipulation by a second instrument other than the position-pointing instrument, or detecting a manipulation by both the position-pointing instrument and the second instrument.

Abstract: A position detecting sensor is configured by providing a dielectric member having flexibility between first conductors and second conductors and providing spacers for separating the first conductors or the second conductors from the dielectric member by a determined gap. When a pressing force is applied by an indicator (e.g., a finger or a pen) on the position detecting sensor, the first conductor and the second conductor come to abut each other, with the dielectric member interposed therebetween. Further, an abutting area (contact area) between the dielectric member and the conductor changes (e.g., increases) according to the pressing force applied by the indicator. Thus, capacitance of the capacitor formed between the first conductor and the second conductor is largely changed, to allow detection of a position indicated by the indicator as well as the pressing force applied at the indicated position with high sensitivity and high accuracy.

Abstract: A position indicator includes a case (2), and a rod (3) housed in the case (2). The rod (3) is passed through a cylindrical ferrite core (6) so that its indicating portion (31) (e.g., pen tip) protrudes from an end of the ferrite core (6). A position detecting coil (4) is wound around the periphery of the ferrite core (6). A switch section (5) (e.g., pressure detector) for detecting the pen pressure of the rod (3) is arranged on the other end of the ferrite core (6). An elastic shock-absorbing member (7) is also attached to the other end of the ferrite core (6), so that the shock-absorbing member (7) is fitted between the ferrite core (6) and the switch section (5). Since any impact force applied to the position indicator is alleviated by the shock-absorbing member (7), damage to the ferrite core (6) and the rod (3) can be prevented or reduced.

Abstract: A dielectric (16) is housed in a chassis (15) having an opening (22) and a main face portion (23). The dielectric (16) is formed with a hole (30) extending from a first surface (28) to a second surface (29) thereof, and the main face portion (23) of the chassis (15) is formed with a through-hole (25). A conductive pin (17) is inserted into the hole (30) and the through-hole (25) with one end portion thereof projected to the outside of the chassis (15) from the main face portion (23). Further, the electrode portion (32) of the lead electrode (18) is interposed between the second surface (29) of the dielectric (16) and the main face portion (23) of the chassis (15), and a terminal piece (33) of the lead electrode (18) is projected toward the outside from the main face portion (23) of the chassis (15). Further, a conductive elastic member (19) is arranged to approach the first surface (28) of the dielectric (16).

Abstract: A variable capacitor is provided for use with an electronic circuit board including a first terminal portion and a second terminal portion, to be built in a position indicator. The variable capacitor includes a dielectric having a first surface portion and a second surface portion opposite to the first surface portion, and a conductive elastic member having a board coupling portion and a dielectric contacting portion. The first terminal portion is coupled to the first surface portion, the second terminal portion is coupled to the board coupling portion, and the dielectric contacting portion is disposed separately from the second surface portion so as to face the second surface portion and is configured to be deformed to come in contact with the second surface portion of the dielectric.

Abstract: A nitride semiconductor device includes a first nitride semiconductor layer having a C-plane as a growth surface, and unevenness in an upper surface; and a second nitride semiconductor layer formed on the first nitride semiconductor layer to be in contact with the unevenness, and having p-type conductivity. The second nitride semiconductor layer located directly on a sidewall of the unevenness has a p-type carrier concentration of 1×1018/cm3 or more.

Abstract: A variable capacitor is disclosed, including: a dielectric having a first surface and a second surface opposing the first surface; a first electrode disposed on the first surface of the dielectric; a second electrode disposed to face the second surface of the dielectric; and a pressing member configured to cause the second electrode and the dielectric to contact each other when a pressing force is applied thereto (e.g., when a pen-shaped position indicator including the variable capacitor is pressed against a tablet). In the variable capacitor, the second electrode includes at least one electrode piece having an abutting central portion, against which the pressing member transmits a pressing force applied thereto, and an extension portion that radially extends from the abutting central portion toward a circumferential portion of the dielectric.

Abstract: A position pointer is disclosed, including a housing, a substantially bar-like rod accommodated in the housing such that one end thereof projects to the outer side of the housing, and a variable capacitor having a capacitance value which varies in response to external force applied thereto through the rod. The variable capacitor includes a dielectric member having a first face portion and a second face portion opposite from the first face portion, a terminal member configured to engage with the first face portion of the dielectric member, an electrode section disposed in an opposing relationship to the second face portion of the dielectric member and including a conductive member having a contact area with the second face portion that varies in response to the external force, and an elastic member configured to bias the conductive member in a direction in which the conductive member is spaced away from the second face portion.

Abstract: A position pointer is provided, which includes a housing having an opening, a bar-like rod disposed in the housing such that one end thereof projects from the opening, and a variable capacitor having a capacitance value which varies in response to pressure applied thereto through the rod. The capacitor includes a dielectric member having a first face portion opposite a second face portion, a first electrode section disposed on the first face portion of the dielectric member, a conductive member facing the second face portion of the dielectric member and forming a second electrode section when brought into contact with the second face portion of the dielectric member, and an elastic member coupled with the conductive member and adapted for biasing the conductive member away from the second face portion. A contact area between the conductive member and the second face portion varies depending on the pressure applied thereto through the rod.

Abstract: A position indicator (100) has a variable capacitor 200, a resonant circuit (36) configured with a position indicating coil (13) and a resonant capacitor (15a), and a rod (11). The variable capacitor (200) has a flat disc-shaped dielectric (1) having two mutually opposite surfaces (1a, 1b), an electrode (2) provided on one surface (1a) of the dielectric (1), a hole (1c) extending between the two mutually opposite surfaces of the dielectric, a conductive portion electrically connecting both ends of the hole, and a conductive elastic member (3) provided near the other surface (1b) of the dielectric (1). The conductive elastic member (3) is arranged on one end of the rod (11).

Abstract: A variable capacitor of a position indicator includes a dielectric, an electrode, a conductive member and a conductive portion. The dielectric has an upper surface and a lower surface opposite the upper surface. The electrode is provided on the upper surface of the dielectric. The conductive member is arranged so as to face the lower surface of the dielectric. The conductive portion is provided on the lower surface of the dielectric and is arranged so as to be electrically connectable to the conductive member. The conductive member is adapted to be elastically deformed when pressed against the lower surface by an external force, such that the capacitance of the variable capacitor changes according to a change of the external force.

Abstract: The present invention relates to a position pointing device comprising a housing (12) for receiving a circuit (28), the circuit having a coil member (18, 20) and a circuit component (10), the coil member having a return wire (32) for forming the circuit, the housing having an inner surface, the inner surface having a groove (30) for receiving at least a portion of the return wire.

Abstract: A position-detecting device detects a position pointed to by a position-pointing instrument and includes an operation panel detecting the position pointed to by the position-pointing instrument; and a manipulation-detecting unit located at at least one of the interior and the exterior of the operation panel, and detecting a manipulation by a second instrument other than the position-pointing instrument, or detecting a manipulation by both the position-pointing instrument and the second instrument.

Abstract: A position-detecting device detects a position pointed to by a position-pointing instrument and includes an operation panel detecting the position pointed to by the position-pointing instrument; and a manipulation-detecting unit located at at least one of the interior and the exterior of the operation panel, and detecting a manipulation by a second instrument other than the position-pointing instrument, or detecting a manipulation by both the position-pointing instrument and the second instrument.

Abstract: The present invention provides a variable capacity condenser having fewer components. A variable capacity condenser according to the present invention comprises a dielectric substance, two electrodes, and a flexible electrode. The dielectric substance has two end faces. The two electrodes are disposed on one end face of the dielectric substance. The flexible electrode faces the other end face of the dielectric substance. The flexible electrode is pressible by a pressing member to vary a distance between at least a portion of the flexible electrode and the other end face of the dielectric substance.