Alps Electric Co., Ltd.

Masamichi Watanabe

Yasushi Watanabe

A circuit board that can be manufactured economically and reliably comprises first and second insulating films and an electrically conductive heat-seal film. Circuit patterns of first and second electrical parts are formed on the first and second insulating films, respectively. These circuit patterns are selectively connected with each other through the heat-seal film. The first insulating film has a hole in which the second insulating film is retained in such a way that the patterns on the first and second insulating films are substantially coplanar with each other.

Circuit board

A circuit board for use in a keyboard has a lower insulating sheet, an insulating sheet, and an upper insulating sheet stacked on top of each other. Switch circuit patterns are formed on the upper and lower insulating sheets so as to be opposed to each other. Circuit patterns acting as electrical parts such as rheostats are formed on the insulating spacer.

Growing community of inventors

Miyagi, Japan

Masamichi Watanabe