Patent ID: 7463396
Filing Date: 2008-12-09
Classification: G02B

Abstract:
1. Device for confocal optical scanning comprising: a rotationally mobile mirror comprising an object face and an image face, the image face being opposed to the object face of the rotationally mobile mirror, an optical path connecting the object face of the rotationally mobile mirror to the image face of the rotationally mobile mirror, at least one microscopic hole placed in an intermediate image plane on the optical path, a first group of at least one control lens, made up of all lenses placed in the optical path between the object face of the rotationally mobile mirror and the microscopic hole, said first group having a positive focal length, a second group of at least one control lens, made up of all lenses placed in the optical path between the microscopic hole and the image face of the rotationally mobile mirror, said second group having a positive focal length, four redirection mirrors for folding the optical path, to allow the optical path to correct the object face of the rotationally mobile mirror to the image face of the rotationally mobile mirror, the orientation of the redirection mirrors being adapted so that a beam incident on the object face with a fixed direction leaves the image face with a fixed direction independent of the position of the rotationally mobile mirror, and so that a beam coming from the object face and incident on the image face has the same direction as the same beam when it leaves the object face towards the image face, comprising no other elements for folding the optical path than said four redirection mirrors, wherein the points A, B, C, D, E, F are not in a same plane, wherein: A is the point on the object face of the movable mirror which is situated on the optical axis, B is the point on the first redirection mirror reached by a beam directed from the object face to the image face of the movable mirror, which is situated on the optical axis, C is the point on the second redirection mirror reached by a beam directed from the object face to the image face of the movable mirror, which is situated on the optical axis, D is the point on the third redirection mirror reached by a beam directed from the object face to the image face of the movable mirror, which is situated on the optical axis, E is the point on the fourth redirection mirror reached by a beam directed from the object face to the image face of the movable mirror, which is situated on the optical axis, F is the point on the image face of the movable mirror which is situated on the optical axis.