EP3247519A1 - Method and device for manufacturing a fresnel freeform surface superposed on a planar or curved area - Google Patents
Method and device for manufacturing a fresnel freeform surface superposed on a planar or curved areaInfo
- Publication number
- EP3247519A1 EP3247519A1 EP16711961.9A EP16711961A EP3247519A1 EP 3247519 A1 EP3247519 A1 EP 3247519A1 EP 16711961 A EP16711961 A EP 16711961A EP 3247519 A1 EP3247519 A1 EP 3247519A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tool
- workpiece
- turning
- diamond
- optics
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/36—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
- B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
Definitions
- the present invention relates to a method and apparatus for ultra-precision processing of a Fresnel lens which describes a non-rotationally symmetric free-form optical surface.
- the Fresnel structure can be superimposed on a planar or arbitrarily curved surface.
- Design algorithms and ray tracing programs used in the design of optics allow the efficient design of increasingly complex optics to realize functional integration, improved imaging, increased efficiency, or smaller overall space.
- the result of the design results in free-form surfaces which, unlike conventional spherical or aspherical optics, have no symmetry along an optical axis.
- the free-form surface optics should be defined in exactly the same way. Toric lenses, for example, thus also belong to the class of non-rotationally symmetrical free-form surfaces.
- the Fresnelization of optics with rotation axis is an old known method.
- the profile of the optics is cut into concentric ring segments each symmetrical to the optical axis and projected piecewise in a plane.
- Well-known examples are foils from overhead projectors or optics from lighthouses.
- the rounding in the bottom of the groove must be as slight as possible, since it represents an artifact that does not occur in the original, unsected appearance.
- groove base roundings of ⁇ 10 ⁇ m are possible since diamond tools have minimum tool radii of up to 1 ⁇ m and smaller.
- semi-radius tools are often used for Fresnel lens production.
- the diamond tool is set at an angle such that the Fresnel side is cut with an outer edge of the tool and thus the kinematic roughness is bypassed.
- Such small structure characteristics can not be realized by conventional optical production with polishing steps to set the lowest possible surface roughness.
- the laser or electron beam writing is used to produce such fresnelarraer freeform surfaces.
- Electron beam writing is widely used to introduce micro and nanostructures (binary) into a surface. Unlike continuous diamond cutting, a pulse of the electron beam vaporizes a very small volume of polymer or paint. If the combination of material to be processed, property of the electron beam or laser beam and the path of the electron beam (overlap of the individual pulses) is selected correctly from a process engineering point of view, not only binary structures (wells) but also so-called 2.5 D to 3D geometries can be achieved by this method produce.
- the electron or laser writing does not achieve the Fresnel lens quality (smooth, precise edge, minimum groove root radius), which is possible by turning the diamond with Fresnel lenses with rotation axis.
- a monocrystalline diamond tool with a tool radius of less than 50 ⁇ m or a corresponding half-radius tool is used.
- usable manufacturing data from the optics design data CAD data or polynomial descriptions, or point clouds is generated in order to calculate production programs with highest interpolation point density.
- FIG. 1 shows a strongly curved optic 1, which is formed symmetrically with respect to the axis of rotation 2,
- FIG. 2 shows a Fresnelization of the optics shown in FIG. 1,
- FIG. 3 shows a plan view of the fresnelized optical system shown in FIG. 2,
- FIG. 4 shows an example of a free-form optical system
- Figure 5 is a Fresnelization of the optics shown in Figure 4.
- FIG. 6 shows a device for producing fresnelized free-form surfaces.
- FIGS. 1 and 2 show how the profile of the optic 1, which is rotationally symmetrical with respect to the axis 2, can be cut into concentric ring segments 3 and thereby projected piecewise into a plane 4.
- This method is known as Fresnelization of optics with rotation axis.
- a plan view of such a Fresnelized optics 5 is shown in FIG.
- the optics 6 shown in FIG. 4 have no rotational symmetry. However, such an arcuate surface 7, as shown in Figure 5, according to can be fresnelized to a level 8 by projecting sections onto the plane.
- FIG. 6 shows a device for processing such freeform surfaces.
- a workpiece 9 is clamped centrally or decentrally in a chuck 10, wherein the chuck is rotatable on a rotation axis 11.
- This axis of rotation 11 is mounted in a block 12 which is displaceable in the direction of the Y-axis 13 and the X-axis 14.
- a tool 16 is mounted laterally displaceable.
- This workpiece 16 is also pivotable about the axis 17 to perform on the workpiece 9 not only turning but also planing.
- the axes must not be arranged orthogonal to each other and there are any combinations of rotational and translational axes conceivable. In this case, at least two and preferably more than two, such as three, four or five axes should be so controlled to be movable to each other that each individual component of motion is performed synchronously in dependence of one or more other components.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Turning (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015000673.8A DE102015000673A1 (en) | 2015-01-23 | 2015-01-23 | Method and apparatus for producing a fresnelized freeform surface superposed on a planar or curved surface |
PCT/DE2016/000006 WO2016116089A1 (en) | 2015-01-23 | 2016-01-08 | Method and device for manufacturing a fresnel freeform surface superposed on a planar or curved area |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3247519A1 true EP3247519A1 (en) | 2017-11-29 |
Family
ID=55637105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16711961.9A Withdrawn EP3247519A1 (en) | 2015-01-23 | 2016-01-08 | Method and device for manufacturing a fresnel freeform surface superposed on a planar or curved area |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3247519A1 (en) |
DE (2) | DE102015000673A1 (en) |
WO (1) | WO2016116089A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108202147A (en) * | 2016-12-20 | 2018-06-26 | 天津津航技术物理研究所 | A kind of folding with centre bore spreads out blending surface speculum method for turning |
CN113210636B (en) * | 2021-04-13 | 2022-11-25 | 霖鼎光学(上海)有限公司 | Device and method for machining shift-centering type micro lens array |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3333679B2 (en) * | 1996-03-04 | 2002-10-15 | 財団法人神奈川科学技術アカデミー | Groove cutting device and groove cutting method |
DE19653233A1 (en) * | 1996-12-20 | 1998-07-02 | Schneider Gmbh & Co Kg | High-speed lathe for the production of optically effective surfaces |
CN101176923B (en) * | 2007-12-07 | 2010-12-08 | 哈尔滨工业大学 | Processing device of micro optical elements with Fresnel structure |
DE102010039757A1 (en) * | 2010-08-25 | 2012-03-01 | Carl Zeiss Ag | Method for manufacturing Fresnel structure adjusting curved active surface in predetermined area of curved boundary surface of optical element, involves mathematically dividing active surface into surface sections of predetermined height |
JP5695214B2 (en) * | 2011-12-14 | 2015-04-01 | パナソニックIpマネジメント株式会社 | Method for creating processing data for ultra-precise combined machining apparatus and ultra-precise combined machining apparatus |
EP2684643A3 (en) * | 2012-05-22 | 2014-04-16 | Schneider GmbH & Co. KG | Device and method for processing an optical workpiece |
-
2015
- 2015-01-23 DE DE102015000673.8A patent/DE102015000673A1/en not_active Withdrawn
-
2016
- 2016-01-08 WO PCT/DE2016/000006 patent/WO2016116089A1/en active Application Filing
- 2016-01-08 DE DE112016000441.9T patent/DE112016000441A5/en active Pending
- 2016-01-08 EP EP16711961.9A patent/EP3247519A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
WO2016116089A1 (en) | 2016-07-28 |
DE102015000673A1 (en) | 2016-07-28 |
DE112016000441A5 (en) | 2017-11-09 |
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Legal Events
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