| 摘要 |
PROBLEM TO BE SOLVED: To provide a position sensor having an optical waveguide which sinks in when small pressing force is applied and quickly returns to an original shape when the pressing force is released.SOLUTION: A position sensor includes: a square sheet-like optical waveguide W comprising a grid of cores 2 sandwiched between a square sheet-like undercladding layer 1 and overcladding layer 3; an elastic layer R provided on a back surface of the undercladding layer 1 of the optical waveguide W; a light-emitting element 4 coupled to one end face of each linear core 2 constituting the grid of cores 2; and a light-receiving element 5 coupled to the other end faces of the linear cores 2. The elastic layer R has a low durometer hardness in a range of 20-40, and a high modulus of repulsion elasticity of no less than 70%. |
