Patent ID: 6316765
Filing Date: 2001-11-13
Classification: G01B,G03F

Abstract:
A device for detecting the position of rotating objects, having an optical signal transmitter and an optical sensor, comprising a stationary light source included in the optical signal transmitter for generating along an optical axis a light beam directed onto a rotating object, the optical sensor being stationary and being arranged on said optical axis on a side of said rotating object located opposite the optical signal transmitter, in the region of said optical axis of the signal transmitter and the sensor, said rotating object being formed with a diametrically extending bore having an entrance window for said light beam and an opposite exit window for said light beam, a slit diaphragm arranged in vicinity of said exit window, and an objective for focusing said light beam onto said slit diaphragm arranged in vicinity of said entrance window, said slit of said slit diaphragm being aligned with a transverse extent thereof at least approximately perpendicularly to an axis of rotation of said rotating object.