US 7,486,270 B2
	Electromagnetic induction electronic board with antenna arrayed in gridding inside
Hsuan-Ming Shih, Chungli (Taiwan)
Assigned to Tai Guen Enterprise Co., Ltd., Taoyuan Hsien (Taiwan)
Appl. No. 10/500,419 PCT Filed Sep. 27, 2002, PCT No. PCT/CN02/00689 § 371(c)(1), (2), (4) Date Jun. 25, 2004, PCT Pub. No. WO03/056418, PCT Pub. Date Jul. 10, 2003.
Claims priority of application No. 01 2 79677 U (CN), filed on Dec. 29, 2001; and application No. 02 1 30933 (CN), filed on Sep. 17, 2002.
Prior Publication US 2005/0052424 A1, Mar. 10, 2005
Int. Cl. G08C 21/00 (2006.01)

U.S. Cl. 345—156  [178/18.07; 178/19.03; 345/157; 345/173; 345/905; 343/700]

19 Claims

1. An electronic whiteboard with built-in membrane antenna array lattice electromagnetic induction layer, including: a writing input portion; a covering frame provided around the periphery of the electronic whiteboard; and a control circuit; wherein the writing input portion has a multilayer structure and is enclosed by the frame, said writing input portion includes a surface writing layer, an underlayer, and an input induction layer which is provided between the surface writing layer and the underlayer and is connected to a control circuit by its output, characterized in that: said induction layer comprises an antenna array etched or printed on an insulation membrane and arranged along with X, Y axes of the electronic whiteboard, wherein an area enclosed by each lattice unit formed by the antenna array constitutes one induction cell; said insulation membrane is a film material.