Patent DE-102011082627-A1 (DE)
Title: Device for guiding light beam, comprises angular adjustable optical component, measuring light beam, detector, plane-parallel plate having two plane-parallel surfaces, wedge plate, actuator, focusing optics, and second plane-parallel plate
Inventor: ASHKENASI DAVID DR
IPC: B23K26/10
Filed: 2011-09-13
Abstract: The device comprises: an angular adjustable optical component, which is rotably driven, arranged and formed to a rotational axis (15) so that an incident light beam parallely passes to the rotational axis through the adjustable optical component and as well as is parallely moved and/or deflected as a result of refraction so that the light beam describes circle path in a plane due to the refraction through the optical component and its rotation transverse to the rotational axis, where the optical component comprises a reflecting surface (126). The device comprises: an angular adjustable optical component, which is rotably driven, arranged and formed to a rotational axis (15) so that an incident light beam parallely passes to the rotational axis through the adjustable optical component and as well as is parallely moved and/or deflected as a result of refraction so that the light beam describes circle path in a plane due to the refraction through the optical component and its rotation transverse to the rotational axis, where the optical component comprises a reflecting surface (126), which is held in such a way that a tilt angle (127) of the optical component is adjusted to a tilting axis transversely arranged to the rotational axis; a device for determining the tilt angle having a light source (310), which is arranged adjacent to the optical component; a measuring light beam transferring in direction of the optical component in such a way that the measuring light beam is reflected during a part of a complete revolution of an optical element by the reflecting surface of the optical component; a detector, which is arranged in such a way that the reflected measuring light beam strikes on the detector; a plane-parallel plate having two plane-parallel surfaces; and a wedge plate, which comprises a first optical element (140) and a second optical element and two plane surfaces as end faces. The optical component is the plane-parallel plate, and the tilt angle is an angle of a surface normal of the plane-parallel surface relative to the rotational axis. The optical elements comprise a complementary spherical surface from which the spherical surface forms a concave surface of the first optical element and an other spherical surface forms a convex surface of the second optical element. The concave surface and the convex surface possess a same radius of curvature in such a way that the planar surfaces are proceeded than the respective spherical surface of the surfaces facing towards the respective optical element optionally in plane-parallel or a wedge angle relative to shift each other along the spherical surfaces facing towards one another. The optical component is a first optical element or a second optical element, where the tilt angle is the angle of the surface normal of the end faces of the first- and/or second- optical elements relative to the rotational axis. The first- and second- optical elements are the optical components and are provided with the two measuring light beams and the detectors. The wedge plate is arranged in a propagation direction of the light beam after the plane-parallel plate. The detector: is formed in such a way that it detects a position of the reflected measuring light; and comprises detection elements arranged in a line. The device further comprises: a device for calculating the tilt angle as a function of the position of incidence of the reflected measuring light beam; an actuator, which is adjusted to the tilt angle and/or a controller that is adapted to drive the actuator so that the reflected measuring light beam strikes in a desired position on the detector; focusing optics, which are arranged in the propagation direction of the light beam before the adjustable optical component; and a second plane-parallel plate, which is arranged in the propagation direction of the light beam after the adjustable optical component. The reflecting surface of the adjustable optical component: has a side surface of the optical components that is arranged so that the measuring light beam temporarily meets during the operation of the device on the side surface and is reflected from the side surface as a function of the tilt angle; and is partially, reflectively coated. The controller is proportional controller, a proportional-integral controller, a proportional-integral-derivative controller or a proportional-derivative controller.