MOTION SENSOR

摘要

A motion sensor comprises an optical fiber (46) disposed between a light source (38) and a light sensor (42). An upper portion of the fiber is treated so that transmission loss of light being communicated through the optical fiber is increased only when the fiber bends in one direction. In another embodiment of the invention, a flexible tube (76) is disposed in close proximity to a finger joint and bends in response to bending of the finger. A light source (38) and light sensor (42) are provided on opposite ends of the tube for indicating the extent of bending of the tube. A wedge (80) is disposed between the tube and the finger for setting the tube straight when the finger is hyperextended. In a further embodiment of the invention, bending the finger in the opposite direction causes the source and sensor to move toward each other.