Patent ID: 6087660
Filing Date: 2000-07-11
Classification: G02B,H01J

Abstract:
A night vision device (NVD) comprising:an image intensifier tube;a source of electrical power for said image intensifier tube;a switch circuit which in a first position of said NVD relative to the earth allows electrical power supply to said image intensifier tube, in a second position of said NVD relative to the earth said switch circuit causing electrical power supply to said image intensifier tube to be discontinued;whereby in said second position of the night vision device, said image intensifier tube is turned off;wherein said switch circuit includes an acceleration-responsive switch sensing movement of said NVD between the first and second positions; in which said acceleration-responsive switch senses accelerations applied to the night vision device;wherein said switch circuit further includes a time delay circuit portion delaying the turning off of said image intensifier tube for a certain interval after each of: the sensing by said acceleration-responsive switch of movement of the NVD to said second position, and after the application of a sufficient acceleration to the NVD affecting said acceleration-responsive switch.