Touch panel for an acoustic touch position sensor

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave for propagation therein, comprising:

• a touch substrate capable of supporting shear waves for propagation therein;
• at least one top array of reflective elements disposed on a top surface of said substrate along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis;
• and
• at least one bottom array of reflective elements disposed on a bottom surface of said substrate along said axis, the reflective elements of said bottom array being vertically aligned with the reflective elements of said top array.

A touch panel for use in a touch position sensor having a first transducer mounted on said touch panel to impart a shear wave for propagation along a first axis and having a second transducer mounted on said touch panel to impart a shear wave for propagation along a second axis substantially perpendicular to said first axis therein comprising:

• a touch substrate capable of supporting shear waves for propagation therein;
• a top array of reflective elements disposed on a top surface of said substrate along said first axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said first axis;
• and
• a bottom array of reflective elements disposed on a bottom surface of said substrate along said second axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said second axis.

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave for propagation therein, comprising:

• a touch substrate capable of supporting shear waves for propagation therein;
• at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis;
• and
• a spurious wave absorbing material disposed on a top surface and a bottom surface of said substrate parallel to the length of said array.

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:

• a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave;
• at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis;
• and
• the number of reflective elements intersecting a line extending perpendicular to said array axis across the width of said array is equal to or greater than 14.

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:

• a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave;
• at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis;
• and
• means disposed on said substrate parallel to said array for suppressing spurious acoustic waves.

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:

• a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave;
• at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis;
• and
• a spurious wave absorbing material disposed adjacent to the length of said array on a top surface and a bottom surface of said touch substrate to suppress spurious waves propagating in said substrate.

A touch panel for use in a touch position sensor having at least one transducer mounted on said touch panel to impart a shear wave of a given wavelength for propagation in said touch panel, comprising:

• a touch substrate capable of supporting shear waves for propagation therein, the thickness of said touch substrate being less than two times the wavelength of the shear wave to be imparted therein and greater than or less than one wavelength of said shear wave;
• at least one array of reflective elements disposed along an axis, each element of said array being positioned at an approximately 45.degree. angle with respect to said array axis, said array being disposed adjacent a first edge of said substrate;
• and
• a spurious wave absorbing material disposed on a top surface and a bottom surface of said substrate parallel to the length of said array adjacent to a second edge of said substrate opposite said first edge.