SENSOR SYSTEM AND METHOD FOR DETECTING POSITION OF POINTER

Title:

SENSOR SYSTEM AND METHOD FOR DETECTING POSITION OF POINTER

Document Type and Number:

Japanese Patent JP2011003173

Kind Code:

A

Abstract:

To provide a sensor system capable of detecting a position of a pointer no matter where in a sensing area the pointer is located, and a method for detecting the position of the pointer.

The sensor system comprises a sensing area 116, a reflecting mirror disposed at a dotted line 202, an image sensing device 110, and a processing circuit. The reflecting mirror indicates a mirror image of the pointer 102 that approaches the sensing area. When the pointer approaches the sensing area, the image sensing device senses the pointer and the mirror image. When the pointer approaches the sensing area, the processing circuit calculates a coordinate value of the pointer from the image sensed by the image sensing device and a planned size of the pointer. Here, the radius of a circular orthogonal projection of the pointer formed in the sensing area is the planned size of the pointer.

Inventors:

CHEN HSIN-CHIA
SU TZUNG-MIN
LU CHIH-HUNG
LIN CHO-YI

Application Number:

JP2009213067A

Publication Date:

January 06, 2011

Filing Date:

September 15, 2009

Export Citation:

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Assignee:

PIXART IMAGING INC

International Classes:

G06F3/041; G06F3/033; G06F3/0346; G06F3/038

Domestic Patent References:

JP2007079744A	2007-03-29
JP2001067176A	2001-03-16

Foreign References:

US20090090569A1	2009-04-09
US20050243070A1	2005-11-03

Attorney, Agent or Firm:

Tadahiko Ito
Shinsuke Onuki
Tadashige Ito

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