Position detecting apparatus

• US 5,453,760 A
• Filed: 05/04/1994
• Issued: 09/26/1995
• Est. Priority Date: 10/26/1990
• Status: Expired due to Term

• Current Assignee: Sharp Electronics Corporation (Hon Hai Precision Industry Co., Ltd.), Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Abe, Hiromi, Okunishi, Toshiyuki, Obuchi, Yasuji
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): Liang, Regina
• Application Number:
  US08/238,142
• Time in Patent Office: 510 Days
• Field of Search: 345/173, 345/174, 345/175, 345/178, 178/18, 178/19, 382/13
• US Class Current: 345/173
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window

Abstract

A position detecting apparatus is provided with a detecting face so as to detect the positions of points specified on the detection face thereof, which is capable of the detection of the minute position with a detection resolution for the whole detection face being not made finer, because the detection resolution of the region in one portion of the detection face is made finer than the detection resolution of the whole detection face, whereby highly advanced manufacturing art is not required as compared with a case where the detection resolution of the whole detection face has been made finer, thus resulting in lower cost.

Claims

1. A position detecting system comprising a position detecting apparatus having a detection face for detecting a position of a specified point and a display apparatus used in combination with said position detecting apparatus,

wherein said position detecting apparatus further comprises:

first position detecting means for roughly detecting a position of a specified point on a first region for rough resolution of the position of the specified point on the detection face, said first region being the entire part of the detection face; and

second position detecting means for precisely detecting the position of the specified point in a second region for fine resolution of the position of the specified point on the detection face, said second region being a partial portion of the detection face, the detection resolution in the second region of the detection face being finer than that of the first region, and

wherein said display apparatus further comprises;

a display screen corresponding to the entire part of the detection face of said position detecting apparatus;

detection position control means for controlling said first and second position detecting means, said detection position control means comprising a region specifying means for specifying a third region of the detection face having the same area and shape as the second region; and

third position detecting means for detecting a position of a point within the third region corresponding to a point from detection results of a position of a point within the second region so that position detection in the third region is effected with the same precise resolution as that of the second region;

display control means for controlling said display apparatus; and

system control means for controlling said position detecting system.

2. The position detecting apparatus as defined in claim 1, wherein the position detecting apparatus and display apparatus are formed integrally as one unit.

3. The position detecting system as claimed in claim 1, wherein data of the positions detected by said first and second position detecting means are transmitted to said display control means by said system control means to control said display apparatus in accordance with the data of the detected positions.