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Position-detecting-apparatus

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Position detecting apparatus

Details

Inventors: Murakami, Azuma; Yamanami, Tsuguya; Funahashi, Takahiko; Senda, Toshiaki;
Assignee: Kabushiki Kaisha Wakom (Saitama, JP)
Primary Examiner: Schreyer; Stafford D.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc, Becker & Shur

A position detecting apparatus for detecting a position pointed by an input pen which comprises: a position detection section constituted by first and second coil groups each composed of a plurality of loop coils; an input pen having a tuning circuit having a predetermined frequency as a tuning frequency; selector means for successively selecting the loop coils of the first and second coil groups of the position detection section one by one; signal generation means for supplying an A.C. signal of the predetermined frequency to the loop coils; signal detection means for detecting the A.C. signal of the predetermined frequency from the loop coils; and controller means for identifying the position pointed by the position pointer on the basis of the A.C. signal detected by the signal detection means from among the loop coils of the first and second coil groups, whereby the position pointed by the input pen can be detected on the basis of the induced voltages obtained in the first and second coil groups. Because each of the first and second coil groups is constituted by a plurality of patterned coil portions, the position detecting apparatus can be made so as to have high resolution with the reduced number of coils.

DETAILED DESCRIPTION An object of the present invention is to provide a position detecting apparatus incorporating a cordless position pointer which is not connected to any part of the stationary portion of the apparatus, thus facilitating the handling while attaining a high degree of precision in position detection and, at the same time, capable of detecting two-dimensional coordinates value of the pointed position in a rectangular coordinate system.
Another object of the invention is to provide a position detecting apparatus incorporating a position detection section having a plurality of loop coils which are respectively composed of a plurality of coils and are arranged at predetermined intervals, thus attaining a high degree of resolution.
A further object of the invention is to provide a position detecting apparatus incorporating a few number of switching means for selecting the loop coils, thus attaining a reduction of the number of parts while attaining reduction of the weight of the apparatus.
To attain the above objects, according to the present invention, there is provided a position detecting apparatus which comprises: a position detection section having first and second coil groups provided on a substrate, each of the coil groups being composed of a plurality of loop coils; a position pointer having a tuning circuit including at least one coil and one capacitor and having a predetermined frequency as a tuning frequency; selection means for successively selecting the loop coils of each of the first and second coil groups of the position detection section one by one; signal generation means for applying an A.
C.
signal of the predetermined frequency to the loop coils; signal detection means for detecting the A.
C.
signal of the predetermined frequency from the loop coils; and controller means for identifying a position pointed by the position pointer on the basis of the A.
C.
signal detected by the signal detection means from each of the loop coils of each of the first and second coil groups

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