Apparatus for a stylus input system for shielding RFI/EMI fields
First Claim
1. A notepad computer, comprising:
- a cabinet having an opening and defining a chamber, said cabinet having a first RFI/EMI shield positioned thereon;
a digitizer positioned within the chamber of said cabinet and producing an electromagnetic field;
a display device located over said digitizer;
a transparent plate located substantially within the opening of said cabinet and over said display device, said transparent plate having an outer side and an inner side, wherein the electromagnetic field produced by said digitizer is able to be altered by contacting the outer side of said transparent plate with an input stylus; and
a transparent second RFI/EMI shield located between said transparent plate and said digitizer.
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0 Petitions
Accused Products
Abstract
An apparatus for a pen-based input system, such as personal communication device or notepad computer, which shields against RFI/EMI fields causing problems either in the internal electronics or in the environment surrounding the system. A digitizer used in such a system must be able to sense a location of a special pen used for inputting information. This digitizer is also a source of RFI/EMI fields. A shield of such RFI/EMI fields must allow the digitizer to work and reduce the amount of RFI/EMI released to the environment. A special transparent conductive layer, such as a coating of Indium-Tin-Oxide, beneath the pen input protective plate performs these two necessary functions. The conductive layer also shields the system internal electronics from external RFI/EMI sources such as attached cellular telephone systems or radio LAN systems.
81 Citations
26 Claims
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1. A notepad computer, comprising:
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a cabinet having an opening and defining a chamber, said cabinet having a first RFI/EMI shield positioned thereon; a digitizer positioned within the chamber of said cabinet and producing an electromagnetic field; a display device located over said digitizer; a transparent plate located substantially within the opening of said cabinet and over said display device, said transparent plate having an outer side and an inner side, wherein the electromagnetic field produced by said digitizer is able to be altered by contacting the outer side of said transparent plate with an input stylus; and a transparent second RFI/EMI shield located between said transparent plate and said digitizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A notepad computer, comprising:
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a digitizer which produces an electromagnetic field; a transparent plate located above said digitizer, said transparent plate having an outer side and an inner side, wherein the electromagnetic field produced by said digitizer is able to be altered by contact the outer side of said transparent plate with an input stylus; a transparent conductive layer located between said transparent plate and said digitizer; and a ground conductor electrically connected to said transparent conductive layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A notepad computer, comprising:
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a cabinet having an opening and defining a chamber, said cabinet having a first conductive layer positioned thereon; a digitizer positioned within the chamber of said cabinet and producing an electromagnetic field; a transparent plate having a top surface and a bottom surface, wherein the electromagnetic field produced by said digitizer is able to be altered by contacting the top surface of said transparent plate with an input stylus; a transparent second conductive layer attached to the bottom surface of said transparent plate; and a ground plane electrically connected to said transparent second conductive layer for absorbing currents induced in said transparent second conductive layer. - View Dependent Claims (20, 21, 22)
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23. A notepad computer, comprising:
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a cabinet having an opening and defining a chamber, said cabinet having a first RFI/EMI shield positioned thereon; a digitizer positioned within the chamber of said cabinet and producing an electromagnetic field; a transparent plate positioned substantially within the opening of said cabinet and having a top surface and a bottom surface, wherein the electromagnetic field produced by said digitizer is able to be altered by contacting the top surface of said transparent plate with an input stylus; a display device interposed between said transparent plate and said digitizer; and a transparent second RFI/EMI shield positionable between the input stylus and said digitizer when the input stylus is contacting the top surface of said transparent plate. - View Dependent Claims (24, 25, 26)
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Specification