An input device has a circular arc resistive layer and a metal plate as a conductive layer that is faced to the circular arc resistive layer, and can detect a position operated by partial contact between them. The input device has an element unit where a linear insulating layer as a contact preventing unit for preventing both ends of the circular arc resistive layer from simultaneously coming into contact with the metal plate during operation is disposed on one end of the circular arc resistive layer.
1. An input device comprising:
a circular arc resistive layer having an opening in a circumferential direction of the circular arc resistive layer and two ends defining the opening in the circumferential direction, wherein the two ends have opposing surfaces facing to each other across the opening; and
a conductive layer faced to the circular arc resistive layer with a gap formed between the conductive layer and the circular arc resistive layer,
wherein the input device can detect a position operated by partial contact between the circular arc resistive layer and the conductive layer, and
wherein the input device further comprises a contact preventing unit, the contact preventing unit preventing both ends of the circular arc resistive layer from simultaneously coming into contact with the conductive layer when operation is performed at an angle position between the both ends of the circular arc resistive layer,
wherein the contact preventing unit is formed of an insulating layer including a first portion overlaid on at least one end of the circular arc resistive layer and a second portion inserted into the opening always in contact with both at least one of the opposing surfaces of the circular arc resistive layer and the conductive layer.
2. The input device of claim 1 ,
wherein the contact preventing unit is L-shaped in a sectional view, and
wherein one leg of the L-shaped contact preventing unit is the first portion, and another leg of the L-shaped contact preventing unit is the second portion that covers a side face of at least one end of the circular arc resistive layer.
3. The input device of claim 1 ,
wherein the second portion is separated from another end of the circular arc resistive layer.