Patent ID: 6350978
Filing Date: 2002-02-26
Classification: G01J,G01R,H05B

Abstract:
A deterioration sensing device comprising:a light-emitting diode; a light-emitting diode driver that supplies an electric power to said light-emitting diode so that said light-emitting diode performs a light-emitting operation to radiate a light beam; a light-receiving diode that senses said light beam; a data output processor that outputs light-emitting data in accordance with said light beam sensed by said light-receiving diode; a light-emitting control circuit that controls said light-emitting diode driver based on said light-emitting data, so that said light-emitting diode performs said light-emitting operation to radiate said light beam at a constant intensity; and a deterioration sensing circuit that compares said light-emitting data with a standard data, so that said deterioration sensing circuit outputs a deterioration signal when a relationship between said light-emitting data and said standard data satisfies a predetermined condition.