Patent ID: 9545524
Date: 2017-01-17
CPC Classifications: A61N

Claim:
1. Light therapy device comprising: at least one light source; a control device for controlling the operation of the light source; a boundary memory containing boundary information defining boundaries for the distance (D) and relative angle (φ) of a user's head with respect to the light source, wherein the boundaries include a minimum distance (Dmin), a maximum distance (Dmax), a minimum angle (φ min) and a maximum angle (φ max); monitoring means for monitoring the actual distance (D) and actual relative angle (φ) of the user's head with respect to the light source, and generating an output signal indicating the measured distance and angle; wherein the control device has an input coupled to the boundary memory for receiving the boundary information; wherein the control device has an input coupled to the monitoring means for receiving the output signal from the monitoring means; wherein the control device is designed to compare the output signal from the monitoring means with the boundary information; and wherein the control device is designed to issue a warning signal when the comparison results indicate that the actual distance or actual angle of the user's head with respect to the light source is outside said boundaries.