Protection Panel with Touch Input Function

Abstract

A protection panel for detecting an X-Y coordinate as an operation position from a potential gradient based on a touch operation to a front substrate is provided. A rear substrate ( 5 ) has a first transparent resistive film ( 5 A) and a contact point ( 5 G) connected to a pair of first terminals ( 5 D) through routing circuits ( 5 C) so that the contact point ( 5 G) is arranged in parallel with the first transparent resistive film ( 5 A). When the rear substrate ( 5 ) and a front substrate ( 6 ) are connected, the contact point ( 5 G) and an expanded region ( 6 Ab) of a second transparent resistive film ( 6 A) on the front substrate ( 6 ) form a switch ( 12 ) for detecting a contact therebetween, based on a voltage detected in the terminals ( 6 D, 5 D) of one of the rear substrate ( 5 ) and the front substrate ( 6 ) when a voltage is applied between the terminals ( 5 D, 6 D) of the other

1 . (canceled) 
     
     
         2 . A protection panel with touch input function comprising:
 a rear substrate whose front face is provided with a first transparent resistive film, a pair of bus bars arranged on opposing sides of the first transparent resistive film, and a pair of first terminals connected to the respective bus bars through respective routing circuits; and   a front substrate whose rear face is provided with a second transparent resistive film, a pair of bus bars arranged on opposing sides of the second transparent resistive film, and a pair of second terminals connected to the respective bus bars through respective routing circuits, and whose front face is provided with a decorated rim portion,   the rear substrate and the front substrate being connected so that the first and second transparent resistive films are arranged opposingly with a predetermined gap and that one of the two pairs of the bus bars are arranged on the opposing sides of the transparent resistive film in an X-direction and the other of the two pairs of the bus bars are arranged on the opposing sides of the transparent resistive film in a Y-direction, to form an analog coordinate input part for detecting an X-Y coordinate as an operation position from a potential gradient based on a touch operation to the front substrate,   wherein   in the front substrate, an expanded region is provided adjacent to a facing region where the second transparent resistive film faces the first transparent resistive film, with a distance between a pair of the bus bars widened,   in the rear substrate, a third transparent resistive film connected to a pair of the first terminals is provided in parallel with the first transparent resistive film, and a pair of bus bars are provided which are arranged on opposing sides of the third transparent resistive film and arranged in parallel with the bus bars,   when the rear substrate and the front substrate are connected, the third transparent resistive film is arranged opposingly with a predetermined gap to the expanded region of the second transparent resistive film, and   the third transparent resistive film and the expanded region of the second transparent resistive film form a switch for detecting a contact therebetween, based on a voltage detected in the terminals of one of the rear substrate and the front substrate when a voltage is applied between the terminals of the other.   
     
     
         3 . The protection panel with touch input function according to  claim 2 , wherein the expanded region of the second transparent resistive film is covered with the same material as that of the bus bar, except for at least a portion where the switch is formed. 
     
     
         4 . The protection panel with touch input function according to  claim 3 , wherein an opening is provided in a portion covered with the same material as that of the bus bar, between the analog coordinate input part and the switch. 
     
     
         5 . (canceled) 
     
     
         6 . The protection panel with touch input function according to  claim 2 , wherein a circuit configuration of the front face of the rear substrate and a circuit configuration of the rear face of the front substrate are interchanged.