US 10,895,734 B2Granted

Korsch telescope

AssigneeThales

InventorsNicolas Tetaz, François-Régis Gourillon

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Abstract

An anastigmat Korsch telescope with three aspherical mirrors includes a bearing structure having a first face to which the first mirror is attached, a hollow structure of a shape elongated in a direction substantially perpendicular to the plane of the central aperture, limited by walls attached to the inside of which are the second mirror in a portion of the hollow structure located in front of the first mirror, and at least one other mirror selected from the third mirror and the at least one deflecting mirror, the walls having at least one first aperture so as to allow a light beam to pass through coming from the object originating from the first mirror and heading toward the second mirror, the bearing structure further comprising means of attachment of the hollow structure to the bearing structure, at least one structure selected from the hollow structure and the bearing structure having a portion traversing the central aperture.

Claims20

Dependent claims

An anastigmat Korsch telescope comprising at least one first concave mirror having a central aperture, a second convex mirror arranged in front of the first concave mirror, a third concave mirror, at least one deflecting mirror and a detector, the first concave mirror, second concave mirror and third concave mirror being aspherical mirrors,

the mirrors being arranged so that the first concave mirror and the second convex mirror form an intermediate image of an object at infinity, the image being located between the second convex mirror and the third concave mirror, the third concave mirror forming a final image of this intermediate image in the focal plane of the telescope wherein the detector is placed,
the telescope further comprising:
a bearing structure having a first face to which the first concave mirror is attached,
a hollow structure of a shape elongated in a direction substantially perpendicular to the plane of the central aperture, limited by walls, attached to the inside of which are the second convex mirror in a portion of the hollow structure located in front of the first concave mirror, and at least one other mirror selected from the third concave mirror and the at least one deflecting mirror,
said walls having at least one first aperture so as to allow a light beam to pass through coming from the object originating from the first concave mirror and heading toward the second convex mirror,
said bearing structure further comprising an attachment device which attaches the hollow structure to said bearing structure,
at least one structure selected from the hollow structure and the bearing structure having a portion traversing said central aperture.

4 more elements

A method of manufacturing an anastigmat Korsch telescope with three aspherical mirrors comprising at least one first concave mirror having a central aperture, a second convex mirror, a third concave mirror, at least one deflecting mirror and a detector, the first concave mirror, second convex mirror and third concave mirror being aspherical mirrors,

the mirrors being arranged so that the first concave mirror and the second convex mirror form an intermediate image of an object at infinity, the image being located between the second convex mirror and the third concave mirror, the third concave mirror forming a final image of this intermediate image in the focal plane of the telescope wherein the detector is placed, the method comprising the steps of:
providing a bearing structure having a first face to which the first concave mirror is attached and having a hollow front portion traversing the central aperture of the first concave mirror,
providing a hollow structure of elongated shape and limited by walls, attached to the inside of which are the second convex mirror and at least one other mirror selected from the third concave mirror and the at least one deflecting mirror, said walls of the hollow structure having at least one first aperture,
inserting the hollow structure into the front hollow portion of the bearing structure,
positioning said hollow structure with respect to the bearing structure in a direction substantially perpendicular to the plane of the central aperture with a position adjustment device, so that the second convex mirror is positioned in front of the first concave mirror at a determined position with respect to the first concave mirror, the first aperture being configured so as to allow a light beam to pass through coming from the object, originating from the first concave mirror and heading toward the second convex mirror,
attaching the hollow structure to the bearing structure by an attachment device implemented from the front portion of the bearing structure,
withdrawing the position adjustment device.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/164,600Filed 18 Oct 2018
Priority: FR 17 0108719 Oct 2017
Published: US 2019/0121114 A125 Apr 2019
Granted: 19 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G02B 23/02
Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices:…
G02B 7/183
For mirrors: specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
G02B 17/0631
Using three curved mirrors: on-axis systems with at least one of the mirrors having a central aperture
G02B 17/0636
Using three curved mirrors: off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry