Patent ID: 6937331
Filing Date: 2005-08-30
Classification: G01J

Abstract:
1. A high-speed electro-mechanical shutter comprising: at least two rotary choppers each having a motor which operates at 3,000 to 10,000 rpm and which are synchronized using a phase-locked loop electronic control; wherein the rotary choppers each comprise a blade means defining a series of transmission apertures which is driven by the motor to cause rotation of the transmission apertures, and wherein the at least two blade means are positioned to cause intermittent synchronous alignment of a first of the transmission apertures of one of the blade means with a second of the transmission apertures of another of the blade means to parse an energy beam that passes through the first and second transmission apertures; and wherein the motors drive the respective blade means so that the first and the second aperture travel pass each other in opposite directions; and wherein, the blade means comprises a disc or a drum; and wherein the blade means comprise a disc and the transmission apertures comprise from about 45 to about 75 evenly distributed slots in the disc, and wherein each slot is about 0.3 to about 0.8 mm wide and about 5 to about 20 mm long; and wherein the slots are peripheral; and a third rotary chopper having a blade means which includes at least one transmission aperture which is positioned to further parse the energy beam that has passed through the first and the second transmission apertures.