Apparatus for detecting an approaching conductor, or an approach point of a conductor and an electrostatic capacity type touch panel apparatus

Patent 6400359 Issued on June 4, 2002. Estimated Expiration Date:

August 26, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Katabami, Koichiro

Assignee

Pentel Kabushiki Kaisha

Application

No. 383653 filed on 08/26/1999

US Classes:

345/173, Touch panel345/174, Including impedance detection345/179Stylus

Examiners

Primary: Shalwala, Bipin
Assistant: Nguyen, Jimmy

Attorney, Agent or Firm

Adams & wilks

Foreign Patent References

61501953 JP. 09/12/1986
1-19176 JP. 04/12/1989
1231119 JP. 09/12/1989
4-48244 JP. 08/12/1992
6-1429 JP. 02/12/1994
7-27434 JP. 03/12/1995
7-69767 JP. 07/12/1995
7-69769 JP. 07/12/1995
7219709 JP. 08/12/1995
8-77894 JP. 03/12/1996
11304942 JP. 11/12/1999

International Class

G09G 005/00

Foreign Application Priority Data

1998-08-27 JP

Abstract

There are provided an apparatus for detecting an approaching conductor and an approach point or position of a conductor, in which a signal processing is simply performed and an improvement in the noise resistance is performed without the influence of a floating capacity. The apparatus has a voltage-oscillating system for equivalently receiving electric oscillation (AC signal) from a detected conductor so that the received electric oscillation is processed as a signal to ground and the processed signal is send to a non-oscillating system through an isolator, the system including a sensor panel or a sensor conductive array, a shield plate, a signal processing circuit, a ground, and power source. In addition, in order to clearly and securably identify a cause of the false earth effect of a detected conductor such as a human body, over 200 kHz oscillation frequency is provided. There is also provided an electrostatic capacity coupling type touch panel apparatus, in which an AC signal is applied into a finger, AC signal being 200 or more kHz frequency.