JPH0367318A - Position indicator and capacitor used for the same - Google Patents

Abstract

PURPOSE:To always secure the stable transmission of the continuous change information on the using state of a position indicator by using a capacitor having its capacity value changing almost continuously in accordance with operations. CONSTITUTION:A tuning circuit 9 is constituted of a coil 3, a chip capacitor 8, and a pressure variable capacitor 6. The capacitor 6 includes the electrodes 11 and 12, a dielectric body 13, and the elastic bodies 14 and 15. The electrodes 11 and 12 are produced by vapor-depositing the copper on a polyimide film having the 7.5 mum thickness. The dielectric body 13 uses a polyimide film having the 7.5 mum thickness and a 3.5 specific dielectric constant in a 6.1 mm diameter. The elastic bodies 14 and 15 use the silicone rubber and function to slowly transmit the pressure or the displacement applied from outside to both electrodes 11 and 12 as well as to the body 13. In such a constitution, about the 40pF capacity is logically secured with the 84.7pF capacity and with the 500g pressure applied in a state where no displacement is applied at all.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a position indicator capable of transmitting information on a specified position as well as information on its operation, that is, change in usage status, and a capacitor used therein.

(Prior art) Conventionally, a position indicator transmits information on a specified position and change in its usage status to the tablet side, and parameters other than coordinate values, such as the thickness of a line, the hue of a specified position or area, etc. 2. Description of the Related Art Various coordinate input devices that change density (brightness) and the like are known.

Claims (14)

[Claims] (1) A position indicator equipped with a tuned circuit consisting only of passive elements such as coils and capacitors, characterized by using a capacitor whose capacitance value changes almost continuously according to operation. vessel. (2) The position indicator according to claim (1), characterized in that a capacitor whose capacitance value changes almost continuously in response to externally applied pressure or displacement is used. (3) The capacitor is housed in a pen-shaped housing so that its pressure application direction or displacement direction coincides with the axial direction, and the capacitor is held so that one end protrudes outward from the housing and can be moved slightly along the axial direction. 3. The position indicator according to claim 2, wherein the other end of the core body is arranged so as to come into contact with the capacitor. (4) Claim (3) further comprising means for bringing the other end of the core into contact with the capacitor with a predetermined pressure.
) position indicator. (5) The position according to any one of claims (2) to (4), characterized in that a capacitor is used in which a dielectric material is arranged between a pair of electrodes and an elastic material is further arranged on at least one side of the dielectric material. indicator. (6) A capacitor according to any one of claims (2) to (4), characterized in that a capacitor is used, in which a dielectric material is sandwiched between a pair of flexible electrodes, and an elastic material is further arranged on both sides of the dielectric material. position indicator. (7) The capacitor is characterized by using a plurality of members in which a dielectric material is sandwiched between a pair of flexible electrodes, which are laminated with an elastic material sandwiched between them, and the elastic material is further placed on both sides. The position indicator according to any one of claims (2) to (4). (8) A first electrode is disposed on one surface of the dielectric, and a flexible second electrode is brought into contact with the other surface, and the second electrode is brought into contact with the dielectric. The position indicator according to any one of claims 2 to 4, characterized in that a capacitor having an elastic body disposed on the opposite side of the surface is used. (9) The position indicator according to any one of claims (5) to (8), characterized in that ceramic is used as the dielectric material. (10) A capacitor characterized in that a dielectric material is arranged between a pair of electrodes, and an elastic material is further arranged on at least one side of the dielectric material. (11) A capacitor characterized in that a dielectric material is sandwiched between a pair of flexible electrodes, and an elastic material is further arranged on both sides of the dielectric material. (12) A capacitor characterized in that a plurality of members in which a dielectric material is sandwiched between a pair of flexible electrodes are laminated with an elastic material sandwiched therebetween, and further elastic materials are arranged on both sides of the members. (13) A first electrode is disposed on one surface of the dielectric, and a flexible second electrode is brought into contact with the other surface, and the second electrode is brought into contact with the dielectric. A capacitor characterized by having an elastic body placed on the opposite side of the surface. (14) The capacitor according to any one of claims (10) to (13), characterized in that a ceramic is used as the dielectric material.