Patent ID: 6660998
Filing Date: 2003-12-09
Classification: G01D

Abstract:
A positioning device for positioning a machine part which is moved by an actuator and a control circuit along a path inside a housing, wherein a timing device (3) is used as a reference point for positioning, the timing device (3) is arranged in a beam path of a light source (6) associated with a sensor unit (5), the positioning device comprisinga beam mask (7) made of a film material; and guide means (12), (14), (22) for positioning the beam mask (7) inside the housing in front of the light source (6); wherein the beam mask (7) is disposed between the light source (6) and the timing device (3) in a mask carrier (8) having a window, wherein the mask carrier (8) integrally comprises spacer elements (9), (18) facing the timing device and maintaining a predetermined spacing between the mask carrier and the timing device by making direct surface contact with the timing device, and wherein the mask carrier (8) further comprises a positioning and mounting plane (10a, 10b) for registration with a base plate (11).