Method and device for detection of a blanket or the like being kicked off the body of a sleeping person

摘要

A blanket covers a light-sensing device that is attached to a portion of a sleeping person which is to be protected against cold. A weak light source is furnished. The light-sensing device is electrically connected with an alarm by means of an extension cable, if necessary. Upon the blanket being kicked off, the light-sensing device will be exposed to the weak light source to generate a signal which is passed to a current amplifier for amplification and activation of the alarm.