Touch panel device and method for manufacturing touch panel devices

A method for manufacturing a touch panel device including a transparent substrate, a touch area disposed at the middle portion of the substrate and transducers disposed at the peripheral portion of the touch area, each of the transducers consisting of a piezoelectric thin film, a plate electrode disposed at one surface of the piezoelectric thin film and a comb-like electrode disposed at the other surface of the piezoelectric thin film, the comb-like electrode having a plurality of comb-like electrode fingers and a linear bus electrode to which one end of each of the plural comb-like electrode fingers is connected, the method comprising the steps of:

• forming the plate electrode on a surface of the substrate;
• forming the piezoelectric thin film on the plate electrode;
• forming the plural comb-like electrode fingers and the bus electrode on the surface of the piezoelectric thin film at the same time as forming an electrode base portion of a wiring electrode that is connected to the plate electrode and the bus electrode on the surface of the substrate by printing silver paste containing fine particles;
• and
• forming an electrode main body of the wiring electrode on the electrode base portion by printing silver paste containing large particles and fine particles in a mixed manner.

A method for manufacturing a touch panel device including a transparent substrate, a touch area disposed at the middle portion of the substrate and transducers disposed at the peripheral portion of the touch area, each of the transducers consisting of a piezoelectric thin film, a plate electrode disposed at one surface of the piezoelectric thin film and a comb-like electrode disposed at the other surface of the piezoelectric thin film, the comb-like electrode having a plurality of comb-like electrode fingers and a linear bus electrode to which one end of each of the plural comb-like electrode fingers is connected, the method comprising the steps of:

• forming the plate electrode on a surface of the substrate;
• forming the piezoelectric thin film on the plate electrode;
• forming the plural comb-like electrode fingers on the surface of the piezoelectric thin film at the same time as forming an electrode base portion of each of the bus electrode and a wiring electrode that is connected to the plate electrode and the bus electrode on the substrate by printing silver paste containing fine particles;
• and
• forming electrode main bodies of the bus electrode and the wiring electrode on each of the electrode base portions by printing silver paste containing large particles and fine particles in a mixed manner.