NL1041787B1 - Adaptable segment to replace a segment within a segemented optical surface. - Google Patents

Adaptable segment to replace a segment within a segemented optical surface. Download PDF

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Publication number
NL1041787B1
NL1041787B1 NL1041787A NL1041787A NL1041787B1 NL 1041787 B1 NL1041787 B1 NL 1041787B1 NL 1041787 A NL1041787 A NL 1041787A NL 1041787 A NL1041787 A NL 1041787A NL 1041787 B1 NL1041787 B1 NL 1041787B1
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NL
Netherlands
Prior art keywords
shape
mirror
mirror segment
segment
segments
Prior art date
Application number
NL1041787A
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Dutch (nl)
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NL1041787A (en
Inventor
Ir Christian Werner Dr
Ir Roger Franciscus Mattheus Maria Hamelinck Dr
Original Assignee
Entechna B V
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Publication date
Application filed by Entechna B V filed Critical Entechna B V
Priority to NL1041787A priority Critical patent/NL1041787B1/en
Publication of NL1041787A publication Critical patent/NL1041787A/en
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Publication of NL1041787B1 publication Critical patent/NL1041787B1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/09—Multifaceted or polygonal mirrors, e.g. polygonal scanning mirrors; Fresnel mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
    • G02B23/06—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors having a focussing action, e.g. parabolic mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0825—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a flexible sheet or membrane, e.g. for varying the focus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/10—Mirrors with curved faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
    • G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
    • G02B7/185—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the shape of the mirror surface

Abstract

Optical instruments can have optical surfaces composed from at least two segments. The segments together describe one optical surface. The segments are separated by small gaps. Although almost identical, the segments do vary slightly in shape. One reason is the varying radius of curvature of the optical surface. Additionally, the contour can vary between segments. The invention relates to a mirror segment that comprises of an optical surface and a support structure, which is adaptable in shape so that it can take or duplicate shapes of segments of the segmented mirror.

Description

Adaptable segment to replace a segment within a segmented optical surface.
Description
Optical instruments such as for example telescopes for astronomy can have optical surfaces composed from at least two segments. Figure 1 shows a schematic of such a segmented optical surface in isometric view. The segments 1 together describe one optical surface. This surface typically is rotational symmetric and possibly has a varying radius of curvature. Figure 1, number 5 is the axis of rotation. Figure 2 shows a top view of the schematic mirror.
The segments are typically polygons (e.g. hexagons) separated by small gaps 16. Although the segments are as much as possible identical for practical reasons, they do however vary slightly in shape. One reason is the varying radius of curvature of the optical surface. Additionally, the polygon contour varies between segments, for example to maintain an even gap between the segments.
In many cases some degree of symmetry is present. The segmented mirror of Figures 1 and 2 has a typical six-fold symmetry 6. Subsequently, only six segments 4 within the mirror are identical in shape.
In this particular layout there are several segments on the same radius 7, such as segment 2 and 3 of Figures 1 and 2. Although these segments have the same curvature, they are mirror images of each other.
Commonly, each segment's out-of-plane shape can be adjusted to correct for example thermally induced disturbances. Usually this adjustment yields a temporally low frequent, low amplitude correction of for example optical focus, astigmatism and trefoil.
Segments are periodically removed from the segmented mirror to perform for example maintenance or repairs. One maintenance task is recoating of the segment's optical surface. When a segment is missing from the segmented mirror, the optical instrument's performance deteriorates or the instrument no longer functions at all. A common way to prevent this, is replacement of the missing segment by a spare segment. The shape of the spare segment must be equal to the shape of the removed segment. For a six-fold symmetric layout such as in Figure 1, this necessitates a set of spares equal in number to l/6th or 16.67% of the number of segments in the segmented mirror. Clearly, the cost of manufacture, storage and maintenance of such large set of spares is significant.
The solution proposed here is a spare segment that is adaptable in shape so it can replace any segment within the segmented mirror. Ultimately this spare segment reduces the set of spare segments to one segment only.

Claims (16)

1. Een spiegelsegment (9,18) dat bestaat uit een optisch oppervlak en een draagstructuur (11,12, 13) die in vorm aanpasbaar is zodanig dat de vorm van elke van de segmenten (8,10,17,19, 26, 27) uit een gesegmenteerde spiegel kan worden aangenomen.A mirror segment (9, 18) consisting of an optical surface and a support structure (11, 12, 13) that is adjustable in shape such that the shape of each of the segments (8, 10, 17, 19, 26, 27) can be assumed from a segmented mirror. 2. Een spiegelsegment (9,18) dat bestaat uit een optisch oppervlak en een draagstructuur (11,12, 13) die in vorm aanpasbaar is, zodanig dat de vorm van een groot aantal van de segmenten (8, 10,17,19, 26,27) uit een gesegmenteerde spiegel kan worden aangenomen.2. A mirror segment (9,18) consisting of an optical surface and a support structure (11,12,13) that is adjustable in shape such that the shape of a large number of the segments (8,10,17,19) 26.27) from a segmented mirror. 3. Een spiegelsegment (9,18) dat bestaat uit een optisch oppervlak en een draagstructuur (11,12, 13) die in vorm aanpasbaar is, zodanig dat de vorm van twee of meer verschillende segmenten (8,10,17,19,26,27) uit een gesegmenteerde spiegel kan worden aangenomen.3. A mirror segment (9,18) consisting of an optical surface and a support structure (11,12,13) that is adjustable in shape such that the shape of two or more different segments (8,10,17,19, 26,27) from a segmented mirror. 4. Een spiegelsegment (9,18) dat bestaat uit een optisch oppervlak en een draagstructuur (11,12, 13) die in vorm aanpasbaar is, zodanig dat de vorm kan worden aangenomen van meerdere verschillende segmenten uit een gesegmenteerde spiegel (8,10,17,19, 26,27), waarbij meer vormverandering kan worden gemaakt dan zonder meer mogelijk is met ieder ander ongewijzigd normaal segment van een gesegmenteerde spiegel.4. A mirror segment (9,18) consisting of an optical surface and a support structure (11,12,13) that is shape-adjustable, such that the shape of several different segments of a segmented mirror can be assumed (8,10) , 17.19, 26.27), where more shape change can be made than is possible without any other unchanged normal segment of a segmented mirror. 5. Een spiegelsegment volgens conclusies 1,2,3 of 4 waarbij het spiegelsegment gesplitst is in twee of meer deel-spiegelsegmenten (20, 22).A mirror segment according to claims 1, 2, 3 or 4, wherein the mirror segment is split into two or more sub-mirror segments (20, 22). 6. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 5 waarbij de vormaanpassing een combinatie is van uit het vlak en in het vlak vormaanpassing.A mirror segment according to one or more of claims 1 to 5, wherein the shape adjustment is a combination of out-of-plane and in-plane shape adjustment. 7. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 5 waarbij de vormaanpassing beperkt is tot vormaanpassing uit het vlak.A mirror segment according to one or more of claims 1 to 5, wherein the shape adjustment is limited to shape adjustment from the plane. 8. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 5 waarbij de vormaanpassing beperkt is tot vormaanpassing in het vlak.A mirror segment according to any one of claims 1 to 5, wherein the shape adjustment is limited to shape adjustment in the plane. 9. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 8 waarbij de vormaanpassing is bereikt door krachten uitgeoefend op het spiegelsegment.A mirror segment according to one or more of claims 1 to 8, wherein the shape adjustment is achieved by forces exerted on the mirror segment. 10. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 8 waarbij de vormaanpassing is bereikt door momenten uitgeoefend op het spiegelsegment.A mirror segment according to one or more of claims 1 to 8, wherein the shape adjustment is achieved by moments exerted on the mirror segment. 11. Een spiegelsegment volgens conclusie 5 waarbij een of meerdere spleten (24, 25, 28, 29) in breedte instelbaar is.A mirror segment according to claim 5, wherein one or more slits (24, 25, 28, 29) is adjustable in width. 12. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 11 waarbij de vorm offline ingesteld kan worden.A mirror segment according to one or more of claims 1 to 11, wherein the shape can be set offline. 13. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 12 waarbij de vorm passief vastgehouden wordt.A mirror segment according to any one of claims 1 to 12, wherein the shape is held passively. 14. Een spiegelsegment volgens een of meer van de conclusies 1 tot en met 12 waarbij de vorm actief, door middel van een of meerdere sensoren, een of meerdere actuatoren en een of meerdere regellussen vastgehouden wordt.A mirror segment according to one or more of claims 1 to 12, wherein the shape is actively retained by means of one or more sensors, one or more actuators and one or more control loops. 15. Een spiegelsegment volgens conclusie 14 waarbij de sensoren, actuatoren en regellussen integraal onderdeel vormen met het spiegelsegment.A mirror segment as claimed in claim 14, wherein the sensors, actuators and control loops form an integral part of the mirror segment. 16. Een spiegelsegment volgens conclusie 14 waarbij een of meerdere sensoren, actuatoren en regellussen zich deels of volledig buiten het spiegelsegment bevinden.A mirror segment as claimed in claim 14, wherein one or more sensors, actuators and control loops are partially or completely outside the mirror segment.
NL1041787A 2016-03-30 2016-03-30 Adaptable segment to replace a segment within a segemented optical surface. NL1041787B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL1041787A NL1041787B1 (en) 2016-03-30 2016-03-30 Adaptable segment to replace a segment within a segemented optical surface.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1041787A NL1041787B1 (en) 2016-03-30 2016-03-30 Adaptable segment to replace a segment within a segemented optical surface.

Publications (2)

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NL1041787A NL1041787A (en) 2017-10-04
NL1041787B1 true NL1041787B1 (en) 2017-10-17

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130283793A1 (en) * 2011-01-31 2013-10-31 Konica Minolta, Inc. Solar light collecting mirror and solar thermal power generation system comprising the solar light collecting mirror
DE102013206981A1 (en) * 2013-04-18 2013-12-24 Carl Zeiss Smt Gmbh Facet mirror for e.g. extreme UV (EUV) projection exposure system used in lighting system, has mirror facet unit that varies radius of curvature of mirror facet from specific radius of curvature to another radius of curvature

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Effective date: 20190401