Patent ID: 7878660
Filing Date: 2011-02-01
Classification: G03B

Abstract:
1. A method for controlling a cooling device of a projecting system with an illuminating device, the method comprising the steps of: starting the projecting system and lighting the illuminating device; cooling the projecting system with a predetermined period as the illuminating device is turned off; restarting the projecting system and lighting the illuminating device; detecting whether the illuminating device is lighted or not; and extending the predetermined period as the illuminating device is not lighted; determining whether the extended predetermined period exceeds an upper limit or not; cooling the projecting system with the extended predetermined period as the extended predetermined period does not exceed the upper limit and adapting the extended predetermined period and lighting the illuminating device again; and cooling the projecting system with the last predetermined period if the extended predetermined period exceeds the upper limit and lighting the illuminating device again.