WO2006015998A1 - Tool and method for polishing optical surfaces - Google Patents
Tool and method for polishing optical surfaces Download PDFInfo
- Publication number
- WO2006015998A1 WO2006015998A1 PCT/ES2005/070108 ES2005070108W WO2006015998A1 WO 2006015998 A1 WO2006015998 A1 WO 2006015998A1 ES 2005070108 W ES2005070108 W ES 2005070108W WO 2006015998 A1 WO2006015998 A1 WO 2006015998A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polishing
- tool
- elastic sheet
- rigid body
- face
- Prior art date
Links
- 238000005498 polishing Methods 0.000 title claims abstract description 88
- 230000003287 optical effect Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims description 16
- 229920001296 polysiloxane Polymers 0.000 claims description 7
- 239000002313 adhesive film Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 14
- 230000000750 progressive effect Effects 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
- B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
- B24D9/08—Circular back-plates for carrying flexible material
Definitions
- the present invention relates to a tool for polishing optical surfaces comprising a rigid body provided with a polishing face, at least as large as an optical surface to be polished, and an elastic sheet disposed between said polishing face and the optical surface a Polish.
- the invention also relates to a method that uses such a tool.
- the machining operation can provide a lens surface that adjusts quite precisely to the desired final shape;
- the polishing operation of these lenses is intended to reduce the average roughness Ra of the surface to values between 0.002 and 0.005 ⁇ n, but without altering or deforming the mechanized shape. Therefore, the effect of the polishing operation must be very well controlled.
- polishing tools have been developed in which the polishing surface can be adapted to some extent to the shape of the lens to be polished: for example, US3583111 describes a tool for a refining operation that has a curved base surface, on which an elastic pad is applied; and patent EP1249397 describes a tool for polishing atoric optical surfaces, in which a surface Rigid base arranged under a layer of elastic material is O-ring, which allows to match more tightly with an atoric lens surface to be polished, and therefore generally allows a greater degree of precision.
- An objective of the present invention is to provide a tool for polishing optical surfaces, and a method for polishing complex optical surfaces such as atoric surfaces and "free forms", that is, progressive surfaces and surfaces of this type to which in addition an O-ring or atoric surface is superimposed, with which at least the aforementioned inconveniences are reduced.
- the present invention relates to a tool for polishing optical surfaces of the type defined in the introduction, which is characterized by the fact that the polishing face of the rigid body it is configured as a portion of a geometric surface, said geometric surface being defined by at least three parameters.
- the tool can adapt more closely to the shape of an optical surface to be polished, especially in the case of surfaces with free shapes, and can be more precise than the tools existing in the uniform polishing of the entire surface of the lens, including the areas near the edges and the center of the optical surface.
- said geometric surface is an atoric surface.
- said atoric surface is a surface of revolution;
- the generator of said atoric surface is an ellipse.
- the elastic sheet may comprise a first layer of flexible material, of a thickness of at least 3 mm, and a second layer of polishing material;
- the first layer of flexible material preferably has a thickness of between 3 and 15 mm, for example between 3 and 8 mm.
- the elastic sheet is provided separated from said rigid body and comprises an adhesive film covered with a removable protective paper.
- said elastic sheet may comprise means for its removal from the polishing face after use.
- the invention relates to a method for polishing optical surfaces, characterized by the fact that it comprises the following steps:
- A provide a polishing tool comprising a rigid body, said body being provided with a polishing face at least as large as an optical surface to be polished and configured as a portion of a geometric surface that is defined by at least three parameters;
- B apply an elastic sheet to said polishing face;
- C polishing at least one optical surface with said tool, based on contacting an optical surface with the tool and causing a relative movement between the two while applying a predetermined pressure, for a predetermined time; and (D) change said elastic sheet before polishing other optical surfaces.
- Said step (A) of providing a polishing tool preferably comprises determining by means of the method of least squares the parameters of the atoric surface that fits more precisely to the optical surface to be polished, and selecting from a set of available tools the tool that It has a polishing face with parameters closer to those determined by the least squares method.
- said step (B) of applying an elastic sheet to the polishing face is carried out by means of a tool comprising a support for the rigid body and means for pressing the elastic sheet against the body with a predetermined pressure
- a tool comprising a support for the rigid body and means for pressing the elastic sheet against the body with a predetermined pressure
- said means for pressing the elastic sheet against the rigid body comprise a cylindrical silicone block of medium hardness;
- a single silicone block is enough to exert pressure against a whole set of rigid bodies, without the need to have a counter-body for each body.
- Figures 1a and 1b show a tool according to an embodiment of the invention, respectively with the two components separated and assembled;
- Figure 2 shows a detail of the elastic sheet of the tool of Figures 1a and 1b;
- a polishing tool according to the invention comprises an essentially cylindrical rigid body 10 having a mounting side 11, intended to mount the tool with conventional means in a polishing device, and a face polishing 12, opposite the mounting side.
- the diameter of the rigid body 10 is similar to that of the optical surface to be polished, or preferably larger.
- the polishing face 12 of the rigid body is a curved surface, which is configured as a portion of a complex geometric surface that is defined by at least three parameters.
- the polishing face is convex and is a portion of an atoric surface.
- the parameters that define said atoric surface depend on the shape of the optical surface to be polished; Your determination will be described later.
- polishing face can also be concave, depending on the curvature of the optical surface to be polished.
- the elastic sheet 20 comprises a first layer of flexible material 21, which is relatively thick and is applied on the polishing surface 12, and a second layer of polishing material 22, which is thinner than said first layer 21 and constitutes the outer surface of the sheet 20, intended to come into contact with the optical surface to be polished.
- a suitable material for the first layer 21 is a physically crosslinked polyolefin foam, for example a foam with a density of 40 kg / m 3 and a 50% compressive strength of 95 kPa.
- Another suitable material for said first layer 21 is a closed-cell polyurethane foam of Shore 00 hardness less than 50 chemically foamed.
- the first layer 21 ideally has a thickness of at least 3 mm; a thickness of less than 8 mm should be sufficient for the great majority of applications, although depending on the hardness of the material it could reach thicknesses of up to 15 mm, which would allow a smaller number of different tools to be used.
- the second layer 22 is made of felt or other similar material, which can be natural or synthetic. These materials are well known in the polishing of optical lenses, and have the function of retaining the abrasive particles contained in suspension in the polishing liquid.
- the second layer 22 is firmly fixed to the first flexible layer 21, for example by means of an adhesive 23.
- the elastic sheet 20 also comprises an adhesive film 24 applied on the surface intended to be in contact with the polishing face 12 of the rigid body 10, and a protective layer 25 that is removed when the elastic sheet 20 must be applied to the polishing face 12 of the rigid body 10.
- a method for polishing an optical surface with this tool comprises selecting a rigid body 10 having an atoric polishing face that is appropriate for the optical surface to be polished, from a set of rigid bodies; apply an elastic sheet 20 to the polishing face of the selected rigid body 10 and place it in a polishing machine; and apply a predetermined pressure and relative movement between the tool and the optical surface, for a predetermined period of time. After this, the elastic sheet 20 can be removed from the rigid body and replaced by another sheet. This change can be made after polishing each optical lens, or a small number of lenses, for example between two and five, can be polished with the same sheet 20, before changing it.
- a set of rigid bodies intended to be used in the polishing process is provided, each of which has a polishing face configured as a portion of a geometric surface that is defined by at least three parameters; to simplify, in general only atoric surfaces of revolution will be used, and more particularly those generated by an ellipse that runs through a circle.
- a surface of this type requires three parameters to be defined: the semi-axes (a, b) of the ellipse that generates the atoric surface, and the radius (R) of the circumference.
- a representation of the parameters of such a surface is shown in Figure 3.
- the atoric surface is determined by the method of least squares that fits more precisely to the shape of the lens ("best atoric surface").
- the following table summarizes the results of this determination, for three different prescriptions Pr1, Pr2 and Pr3.
- Each prescription also overlaps the particular design of the progressive lens;
- the resulting lens is defined by means of a certain number of points, for each of which the distance of a given plane is represented. In these examples, the determination was made based on surfaces defined by 90000 points.
- the last column of the table shows the chi-square value for each example, that is, the sum of the squares of the errors between the points of the surface to be polished and the corresponding points of the best atoric surface.
- a tool is selected from a plurality of available tools that have atoric polishing faces; In each case, a tool will be selected that has parameters a, b and R as close as possible to those determined with the least squares method.
- the elastic sheet provides a certain degree of adaptation between the polishing face of the rigid body and the optical surface to be polished, and therefore allows to provide very good results in the polishing operation without the need to provide a very large number. high of tools with different atoric surfaces.
- a comparative example has been carried out, to show the advantage of using an atoric polishing surface.
- the best toric surface has also been determined, that is, the toric surface that fits more precisely to the shape of the lens to be polished, for the same prescriptions and the same progressive lens designs indicated above, also by the method of least squares;
- the following table summarizes the results, that is, the parameters at 1 and b 1 (radii of the two circumferences) of the best toric surface for each example, and the corresponding chi-square value.
- polishing operation with a tool having an atoric surface of this type will provide a better result in terms of maintaining the mechanized lens shape than if the polishing operation was carried out using an toric tool.
- an elastic sheet 20 is applied to said body.
- This operation can be carried out manually, but for a better result it is preferable to apply the sheet 20 by a small press: the rigid body is it is placed in the press and the sheet 20, from which the protective layer 25 has been previously detached, it is placed in position on the polishing face 21; then the press is lowered, so that a curved rubber cylinder that fits only approximately to the curvature of the rigid body and that has a diameter greater than that of a rigid body, or preferably a cylindrical silicone block of medium hardness , presses the elastic sheet 20 against the rigid body 10 causing it to adhere firmly.
- the diameter of said silicone block is preferably greater than that of the rigid body 10 and the end of the block that presses the sheet is concave, in case the surface 12 is convex; in this way a single silicone block is sufficient for a whole set of rigid convex bodies.
- Said silicone block is, as indicated, of medium hardness and preferably about 50 mm high.
- the operation of removing the elastic sheet from the rigid body after use can be performed manually, by stretching from the protruding flange 26, or by means of a simple tool.
- the parameters of the polishing process for polishing a lens of organic material of 70 mm in diameter may be the following: - inclination between the axis of rotation of the lens and the axis of the tool: 0 or 5 or , preferably 3 or
- the elastic sheet 20 could be applied and maintained on the rigid body by other appropriate means, other than an adhesive film.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05774477A EP1787752A4 (en) | 2004-08-03 | 2005-07-26 | Tool and method for polishing optical surfaces |
US11/573,199 US20080047301A1 (en) | 2004-08-03 | 2005-07-26 | Tool and a Method for Polishing Optical Surfaces |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ESP200401970 | 2004-08-03 | ||
ES200401970A ES2249990B1 (en) | 2004-08-03 | 2004-08-03 | TOOL AND PROCEDURE FOR POLISHING OPTICAL SURFACES. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006015998A1 true WO2006015998A1 (en) | 2006-02-16 |
Family
ID=35839158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2005/070108 WO2006015998A1 (en) | 2004-08-03 | 2005-07-26 | Tool and method for polishing optical surfaces |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080047301A1 (en) |
EP (1) | EP1787752A4 (en) |
ES (1) | ES2249990B1 (en) |
WO (1) | WO2006015998A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE602008004494D1 (en) * | 2008-07-08 | 2011-02-24 | Indo Int Sa | Tool for cleaning conventional and free-form optical surfaces |
EP3272456B1 (en) * | 2016-07-21 | 2019-03-13 | Delamare Sovra | A method for manufacturing in series optical grade polishing tools |
PT3272457T (en) * | 2016-07-21 | 2019-06-27 | Delamare Sovra | A method for manufacturing in series optical grade polishing tools |
EP3272458B1 (en) * | 2016-07-21 | 2019-03-27 | Delamare Sovra | A method for manufacturing in series optical grade polishing tools |
DE102019005084A1 (en) * | 2019-07-16 | 2021-01-21 | Schneider Gmbh & Co. Kg | Polishing tool and device for polishing a workpiece |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3594963A (en) * | 1969-07-17 | 1971-07-27 | Univis Inc | Grinding pad |
GB1321931A (en) * | 1971-05-10 | 1973-07-04 | Wylde Ltd J S | Grinding of optical lens blanks |
JPS61214965A (en) * | 1985-03-19 | 1986-09-24 | Canon Inc | Elastic polishing tool |
EP1179390A2 (en) * | 2000-08-07 | 2002-02-13 | Cerium Group Limited | Intermediate lens pad |
EP1249397A2 (en) | 2001-04-09 | 2002-10-16 | Nichiro Kogyo Co., Ltd. | Arch type strapping machine |
US20030017783A1 (en) * | 2001-04-10 | 2003-01-23 | Joel Bernard | Toric tool for polishing an optical surface of a lens and a method of polishing an atoric surface using the tool |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3623800A (en) * | 1969-10-16 | 1971-11-30 | David Volk | Ophthalmic lens of changing power |
US3781096A (en) * | 1972-11-01 | 1973-12-25 | Jessen Inc Wesley | Method and apparatus for designing contact lenses |
US4221083A (en) * | 1978-01-03 | 1980-09-09 | Valley Industrial Products | Heat shield blocking and mounting disc for lens grinding |
US6645059B1 (en) * | 1999-12-01 | 2003-11-11 | Gerber Coburn Optical Inc. | Device for retaining abrasive pad on lap in eyeglass lens making apparatus |
-
2004
- 2004-08-03 ES ES200401970A patent/ES2249990B1/en not_active Expired - Fee Related
-
2005
- 2005-07-26 WO PCT/ES2005/070108 patent/WO2006015998A1/en active Application Filing
- 2005-07-26 EP EP05774477A patent/EP1787752A4/en not_active Withdrawn
- 2005-07-26 US US11/573,199 patent/US20080047301A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3594963A (en) * | 1969-07-17 | 1971-07-27 | Univis Inc | Grinding pad |
GB1321931A (en) * | 1971-05-10 | 1973-07-04 | Wylde Ltd J S | Grinding of optical lens blanks |
JPS61214965A (en) * | 1985-03-19 | 1986-09-24 | Canon Inc | Elastic polishing tool |
EP1179390A2 (en) * | 2000-08-07 | 2002-02-13 | Cerium Group Limited | Intermediate lens pad |
EP1249397A2 (en) | 2001-04-09 | 2002-10-16 | Nichiro Kogyo Co., Ltd. | Arch type strapping machine |
US20030017783A1 (en) * | 2001-04-10 | 2003-01-23 | Joel Bernard | Toric tool for polishing an optical surface of a lens and a method of polishing an atoric surface using the tool |
Non-Patent Citations (1)
Title |
---|
See also references of EP1787752A4 |
Also Published As
Publication number | Publication date |
---|---|
US20080047301A1 (en) | 2008-02-28 |
ES2249990B1 (en) | 2007-08-01 |
EP1787752A1 (en) | 2007-05-23 |
EP1787752A4 (en) | 2010-04-28 |
ES2249990A1 (en) | 2006-04-01 |
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