EP0054368B1 - Tampon de rodage - Google Patents

Tampon de rodage Download PDF

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Publication number
EP0054368B1
EP0054368B1 EP19810305599 EP81305599A EP0054368B1 EP 0054368 B1 EP0054368 B1 EP 0054368B1 EP 19810305599 EP19810305599 EP 19810305599 EP 81305599 A EP81305599 A EP 81305599A EP 0054368 B1 EP0054368 B1 EP 0054368B1
Authority
EP
European Patent Office
Prior art keywords
pad
groove
working surface
wear
smoothing
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.)
Expired
Application number
EP19810305599
Other languages
German (de)
English (en)
Other versions
EP0054368A2 (fr
EP0054368A3 (en
Inventor
Cyril Kenneth Edwards
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomas Hunter Ltd
Original Assignee
Thomas Hunter Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomas Hunter Ltd filed Critical Thomas Hunter Ltd
Publication of EP0054368A2 publication Critical patent/EP0054368A2/fr
Publication of EP0054368A3 publication Critical patent/EP0054368A3/en
Application granted granted Critical
Publication of EP0054368B1 publication Critical patent/EP0054368B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to lens smoothing pads for smoothing the surfaces of generated lenses to prescription curvature geometrics.
  • the pads are formed from a variety of materials such as metal foil, perforated zinc, annealed woven wire, tempered expanded steel or non metallic materials.
  • the pads are generally adhered to the smoothing face of the tool and are usually formed as a multi-slotted flat element which enables them to conform to the curvature of the smoothing face.
  • the adhesive may be of a contact type applied to the back of the pad and protected by a peel-off backing paper.
  • An object of the present invention is to provide a smoothing pad which overcomes the foregoing disadvantages and, according to the invention, there is provided a lens smoothing pad for mounting on a rigid curved smoothing tool and having a working surface which, in use, conforms to the surface curvature of the tool, a plurality of wear indicator grooves in said working surface each of which extends across the pad from one edge thereof to another edge for indicating wear of the working surface of the pad, and constituting a reservoir for an abrasive slurry used with the pad, each groove comprising a flat bottom surface and side walls extending from the flat bottom surface to the working surface of the pad to provide an indication of wear of the working surface, characterised in that the side walls of each groove are convex between the flat bottom surface of the groove and the working surface whereby the groove diverges towards the working surface so that the width of the groove will diminish as the working surface wears to provide said indication of wear, and said convex side walls provide a gradual transition from the associated groove to the working surface whereby, in use
  • each groove is convex throughout the distance between the flat bottom surface of the groove and the working surface.
  • the side walls of the groove may be of part circular cross section.
  • each convex side wall preferably lies further from the working surface of the pad than said bottom surface of the associated groove.
  • the pad may comprise a metal foil in which said grooves are formed by rolling so as to form recesses in an undersurface of the pad, said undersurface having a layer of adhesive thereon for attaching the pad to a surfacing tool and said recesses being arranged to receive adhesive which is displaced when the pad is applied to the surfacing tool.
  • wear indicator grooves are arranged so that wear indicator grooves in one portion of the working surface are transverse to wear indicator grooves in another portion of the working surface. At least a portion of each such wear indicator groove may follow a curved path in plan. In such a case, a wear indicator groove in one portion of the working surface may be connected by a further groove to a wear indicator groove in another portion of the working surface.
  • Figures 1 to 3 show typical smoothing pads made, e.g. from metal foil.
  • Each pad has a working surface 1 and is formed with one or more slots 2, the slots enabling the pads to conform to various shapes of surfacing tools.
  • the undersurfaces 3 of each pad may be provided with a layer of adhesive (not shown) for securing the pad to the smoothing tool.
  • the adhesive layer is protected by a peel-off backing sheet (not shown) which is removed to expose the adhesive.
  • Each pad is formed with wear indicating grooves 6 which extend part way through the pad as shown clearly in Figure 5.
  • FIG. 4 a smoothing pad 20 has parallel sided grooves 21 (one only of which is shown) and is supported by a tool 22.
  • a lens 23 is moved in random fashion over the working surface 24 of the pad and slurry S is fed to the pad to act as a smoothing medium.
  • a certain amount of slurry S' is contained in the grooves 21 and during relative movement it is highly desirable that some of the slurry flows out of the grooves and across the pad between the lens 23 and the working surface 24.
  • slurry S on the lens surface tends to be scraped off the lens by sharp lines of transition 25, 25a between the groove 21 and the working surface 24.
  • the slurry is scraped off at 25 and when moving the lens in the opposite direction the slurry is scraped off at 25a.
  • the scraping action tends to inhibit the usefulness of such flow.
  • the groove 6 has a flat bottom 31 and arcuate side walls 32, 32a.
  • the side walls form a gradual transition between the bottom of the groove 6 and the working surface 33 of the pad as opposed to the sharp lines of transition 25, 25a in Figure 4.
  • the curved wall 32 encourages the slurry S11 to be drawn out of the groove by the moving lens and does not have the scraping effect of the sharp transitions.
  • the wall 32a has a similar effect when the lens is moved in the opposite direction. This arrangement is particularly advantageous and reduces the likelihood of dry areas void of slurry occurring on the working surface.
  • the arrangement shown in Figure 5 provides an indication of wear by reduction of width. That point is illustrated well in Figure 6.
  • the width W of the groove is as follows:- where
  • the groove 6 also provides a multiplier wear facility by which the rate of change of groove width is greater than the rate of pad surface wear.
  • Pad grooves can be cut into the pad but such a method of forming can weaken the pad as the grain of the foil is severed.
  • a pad formed in that way is shown in Figure 15 and recesses 9 are formed therein during the rolling operation. Displaced adhesive is received by the recesses 9 to reduce the risk of distorting the bottom of the wear indicating groove 6 when the pad is applied to a surfacing tool.
  • Figures 7 to 14 various groove patterns are illustrated which provide reservoirs and facilitate distribution of slurry over the working surface of pads in accordance with the invention.
  • the provision of a multiplicity of grooves increases the availability of slurry because the grooves form a reservoir for slurry during movement of the pad/lens.
  • pads made in accordance with the present invention are easily checked for wear by the eye, a suitable checking instrument may be used to detect width variation even before it becomes apparent to the naked eye.
  • Pads in accordance with the invention may be formed from material other than metal and need not be provided with an adhesive backing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Claims (8)

1. Tampon de polissage de lentille destiné à être monté sur un outil de polissage (22) rigide et cintré et présentant une surface de travail (33) qui, à l'usage, se conforme à la courbure de l'outil, une pluralité de rainures indicatrices d'usure (6) dans ladite surface de travail, chacune d'entre elles s'étendant de l'une à l'autre extrémité du tampon pour indiquer l'usure de la surface de travail du tampon et constituant un réservoir de boue abrasive (S") utilisée avec le tampon, chaque rainure comprenant une surface de base plate (31) et des parois latérales (32) s'étendant depuis la surface de base plate jusqu'à la surface de travail du tampon pour fournir une indication sur l'usure de la surface de travail, caractérisé en ce que les parois latérales (32) de chaque rainure sont convexes entre la surface de base plate (31) de la rainure (6) et la surface de travail (33), la rainure divergeant vers la surface de travail de telle sorte que la largeur de la rainure diminue quand la surface de travail s'use, afin de fournir ladite indication d'usure, et lesdites parois latérales convexes (32) fournissant une transition graduelle depuis la rainure associée (6) jusqu'à la surface de travail (33), la boue abrasive (S11) étant ainsi encouragée, à l'usage, à s'écouler de chaque rainure sur la surface de travail.
2. Tampon de polissage de lentille selon la revendication 1, caractérisée en ce que les parois latérales (32) de chaque rainure sont convexes sur toute la distance entre la surface de base plate (31) de la rainure et la surface de travail (33).
3. Tampon de polissage de lentille selon les revendications 1 ou 2, caractérisé en ce que lesdites parois latérales convexes (32) sont de section transversale semi-circulaire.
4. Tampon de polissage de lentille selon les revendications 1 ou 3, caractérisé en ce que le centre de courbure de chacune des parois latérales convexes (32) se trouve plus loin de la surface de travail (33) du tampon que ladite surface de base (31) de la rainure associée (6).
5. Tampon de polissage de lentille selon l'une des revendications précédentes, caractérisé en ce qu'il comporte une feuille métallique dans laquelle lesdites rainures (6) sont formées par laminage de façon à former des échancrures (9) dans une face inférieure du tampon, ladite face inférieure comportant une couche d'adhésif pour lier le tampon à l'outil de polissage (22) et lesdites échancrures étant prévues pour recevoir l'adhésif qui est déplacé quand le tampon est appliqué sur l'outil de polissage.
6. Tampon de polissage de lentille selon l'une des revendications précédentes, caractérisé en ce que lesdites rainures indicatrices d'usure (6) sont disposées de telle sorte que les rainures (6) dans une partie de la surface de travail sont transversales aux rainures (6) dans une autre partie de la surface de travail (33).
7. Tampon de polissage de lentille selon la revendication 6, caractérisé en ce qu'une partie au moins de chaque rainure indicatrice d'usure (6) suit un parcours en courbe avec le tampon vu en plan.
8. Tampon de polissage de lentille selon la revendication 7, caractérisé en ce qu'une desdites rainures indicatrices d'usure (6), dans une partie de la surface de travail, est reliée par une autre rainure (10) à une rainure indicatrice d'usure (6) dans une autre partie de la surface de travail.
EP19810305599 1980-11-28 1981-11-26 Tampon de rodage Expired EP0054368B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8038235 1980-11-28
GB8038235 1980-11-28

Publications (3)

Publication Number Publication Date
EP0054368A2 EP0054368A2 (fr) 1982-06-23
EP0054368A3 EP0054368A3 (en) 1983-02-09
EP0054368B1 true EP0054368B1 (fr) 1986-05-21

Family

ID=10517632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810305599 Expired EP0054368B1 (fr) 1980-11-28 1981-11-26 Tampon de rodage

Country Status (2)

Country Link
EP (1) EP0054368B1 (fr)
DE (1) DE3174677D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103958389A (zh) * 2011-03-30 2014-07-30 吉尼工业公司 耐磨片装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577950A (en) * 1993-11-29 1996-11-26 Coburn Optical Industries, Inc. Conformal tool operating apparatus and process for an ophthalmic lens finer/polisher
US5736427A (en) * 1996-10-08 1998-04-07 Micron Technology, Inc. Polishing pad contour indicator for mechanical or chemical-mechanical planarization
JP5635957B2 (ja) * 2010-09-09 2014-12-03 日本碍子株式会社 被研磨物の研磨方法、及び研磨パッド

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804733A (en) * 1953-05-21 1957-09-03 Rexall Drug Company Abrasive article
US2907146A (en) * 1957-05-21 1959-10-06 Milwaukee Motive Mfg Co Grinding discs
FR1390205A (fr) * 1963-06-04 1965-02-26 Zane & C Snc Disque abrasif flexible, procédé pour sa fabrication et moyens pour réaliser ce procédé
US3324608A (en) * 1965-01-27 1967-06-13 Thompson Proc Co Inc Facing assembly for lens grinding tools and the like
US4019289A (en) * 1976-02-23 1977-04-26 Clayton Paul Korver Replaceable lens surfacing pad with integral wear indicating pattern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103958389A (zh) * 2011-03-30 2014-07-30 吉尼工业公司 耐磨片装置
CN103958389B (zh) * 2011-03-30 2016-05-18 吉尼工业公司 耐磨片装置及具有该耐磨片装置的悬臂组件

Also Published As

Publication number Publication date
EP0054368A2 (fr) 1982-06-23
DE3174677D1 (en) 1986-06-26
EP0054368A3 (en) 1983-02-09

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