Patent ID: 6731421
Filing Date: 2004-05-04
Classification: B01D,G02B

Abstract:
An apparatus for focusing an input laser beam projected along a projection axis, the apparatus comprising:a first wedge plate extending from an inlet end to a discharge end, the first wedge plate being positioned at a reflection angle relative to the projection axis of the input laser beam; and a second wedge plate extending from an inlet end to a discharge end, the second wedge plate being positioned at the reflection angle relative to the projection axis in a direction opposite the first wedge plate, wherein the inlet end of the first wedge plate and the inlet end of the second wedge plate are separated by an inlet opening and the discharge end of the first wedge plate and the discharge end of the second wedge plate are separated by a discharge opening, wherein the width of the inlet opening is greater than the width of the input laser beam and the width of the discharge opening is less than the width of the input laser beam, wherein the first wedge plate and the second wedge plate are rotatable about the projection axis and maintain the reflection angle between the first and second wedge plates and the projection axis during said rotation, wherein rotation about the projection axis adjusts the output pattern of the focusing device.