Patent ID: 7833567

Claim:
A method for forming an electric circuit on at least one door trim panel comprised by a car, the method comprising the steps of: determining a position and a profile of the door trim panel disposed on the car and a position and a shape of an electric circuit formed on the door trim panel when the car is designed; storing a set of three-dimensional data of the door trim panel and the electrical circuit determined at the design into a storage section as a first reference coordinate system; and converting the car set of three-dimensional data in the first coordinate system to a door trim panel set of three-dimensional data in a second coordinate system provided in relation to the door trim panel disposed on a transfer unit and having a second origin in the door trim panel; and intermittently jetting a molten metal against the door trim panel to define rows of metal grains so as to deposit the molten metal on a surface of the door trim panel to form the electric circuit on the door trim panel based on the door trim panel set of three-dimensional data, wherein the first coordinate system and the second coordinate system do not coincide, wherein the deposited metal grains overlap one another such that the electric circuit has the cross-sectional area stored in the second set of three-dimensional data between the two points, and wherein the molten metal is jetted from a nozzle and both the nozzle and the door trim panel have respective X, Y, Z axes perpendicular to each other, the nozzle being movable along each of the X, Y, Z axes, the nozzle moving in a circumferential direction around each of the X axis and Y axis, and the door trim panel being movable along each of X, Y, Z axes and also in a circumferential direction around each of the X, Y, Z axes.