Variable capacitance type capacitor

Abstract

A variable capacitance type capacitor is provided, which has a simple construction, can be easily housed in a thin type casing such as that of a position indicator or the like, and can be readily put into mass production. The variable capacitance type capacitor includes an inside member and an outside member including a space for housing the inside member. The inside member has a columnar shape, and a first conductor pattern is formed on a circumferential surface thereof. The outside member has a predetermined dielectric constant, and a second conductor pattern is formed on an outer circumferential surface thereof so as to oppose the first conductor pattern formed on the inside member. The inside member housed in the space of the outside member is displaced relative to the outside member in a direction of a central axis of the inside member in response to an externally applied force, and an opposed area between the first conductor pattern and the second conductor pattern changes to thereby form a capacitance corresponding to the externally applied force between the first electrode and the second electrode.

Description

technical field [0001] The present invention relates to a capacitance variable capacitor that detects pressure applied from the outside as a change in electrostatic capacitance. Background technique [0002] As an example of a position input device used as an input device such as a personal computer, for example, the following devices are known, which include: a position indicator having a pen shape and having a pen pressure detection unit; An input surface for inputting instruction operations, characters, images, and the like. [0003] In addition, conventionally, a capacitance-variable capacitor described in Patent Document 1 (Japanese Patent Laid-Open No. 4-96212) has been used for a pen pressure detection unit of a position indicator. In the capacitance variable capacitor described in Patent Document 1, as a structural component housed in an elongated cylindrical frame, there is a combination of a first conductor mounted on one end surface of a cylindrical dielectric an...

AI Technical Summary

Problems solved by technology

[0010] However, in the capacitance variable capacitor for the position indicator of Patent Document 1, a plurality of component groups are arranged in the direction of the applied pressure, and the second conductor is elastically displaced according to the applied pressure. Therefore, the component groups are assembled in advance. In the case of a modular component, it is necessary to accommodate the component in a predetermined case member, and it is difficult to miniaturize the modular component

Therefore, if it is installed as a modular part, there is a problem that it becomes an obstacle when the pen-shaped position indicator is refined.

In addition, the thinner the pen-shaped position indicator is, the more difficult it is to secure the opposing area between the second conductor and the other end surface of the dielectric.

[0011] In addition, when a predetermined component group is assembled to produce a modular component, the assembly takes time

Therefore, it takes time for the operator to assemble the modular parts, and then combine them with other parts and arrange them in the casing, and there is also a problem of poor productivity.

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