US3865178A - Apparatus for casting a holding block on an ophthalmic lens - Google Patents

Apparatus for casting a holding block on an ophthalmic lens Download PDF

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Publication number
US3865178A
US3865178A US361971A US36197173A US3865178A US 3865178 A US3865178 A US 3865178A US 361971 A US361971 A US 361971A US 36197173 A US36197173 A US 36197173A US 3865178 A US3865178 A US 3865178A
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US
United States
Prior art keywords
blank
mounting member
face
finished
annular portion
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 - Lifetime
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US361971A
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English (en)
Inventor
Serge Legendre
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.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
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Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
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    • 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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • B24B13/0052—Lens block moulding devices
    • 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

Definitions

  • ABSTRACT The ophthalmic lens blank finished on one face is covered with a mounting member of which the wall covering the finished face of the blank is shaped to act as a bearing means for positioning the lower contour of the mould of the holding-block casting device and permitting the penetration, between said finished face of the blank and the mounting member, of the lowmelting alloy cast by the holding-block casting device.
  • the mounting member remains incorporated in the block-supported blank except for a centering strip surrounding the cylindrical edge of the blank, said strip being removed by pulling a gripping member and tearing circumferentially a circular bridge portion of moderate thickness, before fit- [56] References Cited ting the block-supported blank on the machine for UNITED STATES PATENTS surfacing, grinding or shaping the unfinished face of 1,952,373 3/1934 Hill 51/216 LP he blank.
  • the essential object of this invention is to warrant an easy and accurate fixing, on a semi-finished blank of ophthalmic lens, notably a blank of which the finished or first face is not spherical (such as toroidal, progressive, non-toroidal, or non-spherical), a metal block for subsequently mounting or blocking this blank in a conventional surfacing machine in which the other face is eventually finished.
  • a semi-finished blank of ophthalmic lens notably a blank of which the finished or first face is not spherical (such as toroidal, progressive, non-toroidal, or non-spherical)
  • a metal block for subsequently mounting or blocking this blank in a conventional surfacing machine in which the other face is eventually finished.
  • a very accurate positioning of the mould in relation to the reference axes of the lens blank, i.e., in relation to the first finished face must be obtained in order to ensure the necessary precision of the subsequent operations such as edge-shaping or grinding and trimming.
  • an ordinary casting and blocking device can be utilized as such and without bringing any modification thereto, irrespective of the nature of the surface of the finished face of the lens blank.
  • a known proposition for solving this problem and meeting these requirements consists in providing for each type of device to be blocked a set of adaptor rings having one face shape to accommodate the finished face of the blank and the other face shaped to adapt itself to the blocking device to be used.
  • This solution makes it necessary for the surfacing operator to have at his disposal a considerable stock of adaptor rings and obviously this stock must further be increased or replaced with another one if the operator utilizes several types of blocking devices or changes the lens model to be manufactured.
  • the positioning of the ring in relation to the lens blank is relatively inaccurate and may become accidentally misadjusted during the handling preceding the block casting operation.
  • This invention relates to an improved method of blocking and casting an ophthalmic lens blank finished on one face only, which consists essentially in fixing to the blank by means of the metal fused during the casting operation a mounting member formed with bearing surfaces adapted to engage the mould clamping surfaces of the casting device.
  • the present invention is also concerned with the mounting member necessary for carrying out this method.
  • FIG. 1 is a perspective view showing the mounting member fitted to an ophthalmic lens blank, one portion of the mounting member being broken away to illustrate more clearly its mode of engagement of the blank;
  • FIG. 2 is a plan view from above of the same assemy
  • FIG. 3 is a section taken along the line Ill-Ill of FIG.
  • FIG. 4 is a perspective view showing on a larger scale the right-hand portion of the assembly shown in FIG. 3;
  • FIG. 5 is a sectional view similar to FIG. 3 showing the blank and the metal block fastened thereto by casting.
  • the mounting or reinforcing member 10 comprises at least one bearing element or portion 11 adapted to engage, or bear on, the finished face 14 of the ophthalmic lens blank 13, shaped to accommodate said face, and opposite this bearing portion 11 a part-spherical, tapered or flat seat 12 engageable by the mould of the block casting device or machine; the mounting member further comprises means for detachably assembling same to the blank 13.
  • These means may consist for example of a cylindrical skirt l5 bearing with a slight clamping effect, with its inner face, against the cylindrical circumferantial surface 16 of the lens blank.
  • they act as centering means to said mounting member, and complementary means are advantageously provided for obtaining a proper angular setting, for example in the form of an inner radial projection 18 of said skirt which engages a notch or groove 19 formed to this end in the edge of the lens blank 13.
  • the reference axes of the blank are positioned very easily and conveniently. notably in relation to the axis of its part-spherical seat 12 or to an axis connected to the plane seat, if any.
  • the bearing elements or portions II are three in number and rigid with an annular convex portion 20 formed with a central aperture 21 permitting the access to the finished face 14'; this annular convex portion 20 is connected to the cylindrical skirt 15 by means of a continuous bridge portion 22 of moderate thickness and, therefore, adapted to be torn off very easily.
  • These bearing faces project from the annular portion, on the face thereof which is adjacent to the inner face of the cylindrical skirt, and the opposite face of said annular portion constitutes a seat 12 which, from a part-spherical or tapered surface, centered to the axis of the aforesaid skirt, is adapted to receive the mould of the block casting machine.
  • One of the bearing elements lla has for example a greater area than the other two llb and registers with the projection 18 carried by the skirt, these other two faces llb being disposed symmetrically in relation to the first one Ila and lying substantially on one diameter of said annular con vex portion 20.
  • the skirt [5 comprises an incipient or starting of tear 24 and, adjacent the latter, a gripping lug 25.
  • the mounting or reinforcing member 10 is positioned on the lens blank by engaging the skirt 15 around the edge 16 of said blank, the projection 18 fitting into the notch 19 while the bearing faces Ila and llb engage the finished face 14 of blank 13.
  • the aperture 21 gives access to the central portion of the finished face of this blank, and between the annular portion 20 and the finished face of the blank there remains an annular gap 27 interrupted only by the bearing faces 11a and 11b, and bounded on its outer periphery by the inner surface of skirt 15.
  • the mounting member is advantageously obtained by injecting a suitable plastic material such as polyethylene into a suitable mould (not shown). lts shape is such that after positioning this member on the blank 13 the axis of symmetry of the spherical, tapered or flat seat 12 is substantially coincident with the blank axis, notably to the axis of the face 26 to be shaped and finished.
  • this member 10 of transparent or translucent material nad to limit the opposite bearing elements llb by means of a pair of radial faces 28 disposed on a common diameter of this member which must be coincident with the mounting diameter of the blank. Thus, any positioning error will be noticed immediately by the operator.
  • the annular portion 20 is provided with outer peripheral radial reference marks 30 or any other similar graduations or scales which can be seen by the operator through the blank 13 to enable the operator to properly position the assembly of said blank 13 and said mounting member 10 in the casting machine. Having completed this adjustment, the operator will see that the edge 32 of mould 33 (FIG. 3) engages throughout its length the seat 12. Then, the metal of the casting block is allowed to flow into the mould to fill up all the spaces and interstices left between this mould and the blank, notably the space 27.
  • this assembly comprises a block 35 adhering to the blank 13 throughout the finished face 14 thereof, except for the small marginal surface occupied by the bearing elements 11a, 11b, at least most of the annular portion remaining trapped in this block 35.
  • This assembly is then easily mounted in a surfacing or finishing machine, exactly as in the case of a lens holding block obtained according to the conventional technique.
  • the height of the skirt 15 may be such that it projects beyond the edge of the nonfinished surface 26 of the lens blank provided with the reinforcing or mounting member 10, in order to protect this edge against shocks; on the other hand, this skirt 15 or the seat 12 may project somewhat above the finished face 14, notably in the most frequent case in which this face is convex, so as to protect this face likewise.
  • the mounting member 10 fitted to the blank 13 constitutes a very convenient packing element for handling or delivering this blank.
  • Mounting member for use in casting a holding block on an ophthalmic lens blank finished on one face only, and adapted for fitting to the blank through centering means, means for fixing the mounting member on said blank in the angular direction, and means for engaging the finished face of said blank, said mounting member having a substantially annular configuration with an annular portion adapted to engage the finished face of the blank, said centering means comprising a cylindrical skirt forming a downward extension of said annular portion and adapted to engage with a slightly clamping force the outer cylindrical edge of the blank, and said means for fixing the blank in the proper angular direction comprising a projection carried by said skirt and engageable in a matching notch formed in the edge of said blank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Lens Barrels (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US361971A 1972-05-29 1973-05-21 Apparatus for casting a holding block on an ophthalmic lens Expired - Lifetime US3865178A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219131A FR2186441B1 (pt) 1972-05-29 1972-05-29

Publications (1)

Publication Number Publication Date
US3865178A true US3865178A (en) 1975-02-11

Family

ID=9099234

Family Applications (1)

Application Number Title Priority Date Filing Date
US361971A Expired - Lifetime US3865178A (en) 1972-05-29 1973-05-21 Apparatus for casting a holding block on an ophthalmic lens

Country Status (11)

Country Link
US (1) US3865178A (pt)
JP (1) JPS5442116B2 (pt)
BR (1) BR7303920D0 (pt)
DD (1) DD105572A5 (pt)
ES (1) ES415017A1 (pt)
FR (1) FR2186441B1 (pt)
GB (1) GB1425903A (pt)
HU (1) HU173588B (pt)
IT (1) IT985891B (pt)
NL (1) NL7307475A (pt)
SU (1) SU528024A3 (pt)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266996A (en) * 1980-01-25 1981-05-12 Spectra-Physics, Inc. Method and tool for producing centered parts having spherical surfaces
US4844143A (en) * 1987-03-30 1989-07-04 Essilor International (Compagnie Generale D'optique) Mold for fixing a metal block on one of the faces of an ophthalmic lens
EP0807673A1 (de) * 1996-05-15 1997-11-19 Hamo Ag Klebeschutzfolie für optische Gläser sowie Verfahren zu ihrer Entfernung
DE10017363A1 (de) * 2000-04-07 2001-10-18 Rmh Polymers Gmbh & Co Kg Verfahren zum automatischen Auftragen eines Schutzlackes auf Brillenglasrohlinge
DE19925087C2 (de) * 1999-06-01 2002-11-21 Rmh Polymers Gmbh & Co Kg Vorrichtung zum blasen- und faltenfreien Beschichten von optischen oder elektronischen Bauteilen mit einseitig klebender Schutzfolie
US20060073770A1 (en) * 2002-01-09 2006-04-06 Hoya Corporation Vapor deposition crucible
CN102785146A (zh) * 2011-05-17 2012-11-21 Hoya株式会社 透镜坯件及其制造方法、以及透镜的制造方法
US20120295518A1 (en) * 2009-12-24 2012-11-22 Eric Gacoin Method for Mounting an Optical Lens to be Polished
US8659842B1 (en) * 2012-09-13 2014-02-25 Himax Technologies Limited Image capturing device and assembling method thereof
CN106334974A (zh) * 2016-10-31 2017-01-18 福建福晶科技股份有限公司 一种光学件的垂直度的加工方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2329427A1 (fr) * 1975-10-30 1977-05-27 Essilor Int Procede pour la realisation d'une lentille ophtalmique a puissance focale progressivement variable, et palet semi-fini formant un produit intermediaire dans ce procede
JPS5419394U (pt) * 1977-07-12 1979-02-07

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952373A (en) * 1924-04-10 1934-03-27 American Optical Corp Lens blocking device
US2304984A (en) * 1939-07-25 1942-12-15 Eastman Kodak Co Lens mount
US3330331A (en) * 1964-09-18 1967-07-11 Textron Inc Method and apparatus for blocking a lens blank
US3353307A (en) * 1964-10-29 1967-11-21 Titmus Optical Company Inc Lens holder for metallic blocking system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS431012Y1 (pt) * 1964-07-15 1968-01-18
JPS436381Y1 (pt) * 1965-02-10 1968-03-21
FR1517121A (fr) * 1966-03-02 1968-03-15 Univis Inc Procédé et bloc de montage pour la fabrication de verres ophtalmologiques à partir d'ébauches ainsi que verres conformes à ceux ainsi obtenus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1952373A (en) * 1924-04-10 1934-03-27 American Optical Corp Lens blocking device
US2304984A (en) * 1939-07-25 1942-12-15 Eastman Kodak Co Lens mount
US3330331A (en) * 1964-09-18 1967-07-11 Textron Inc Method and apparatus for blocking a lens blank
US3353307A (en) * 1964-10-29 1967-11-21 Titmus Optical Company Inc Lens holder for metallic blocking system

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266996A (en) * 1980-01-25 1981-05-12 Spectra-Physics, Inc. Method and tool for producing centered parts having spherical surfaces
US4844143A (en) * 1987-03-30 1989-07-04 Essilor International (Compagnie Generale D'optique) Mold for fixing a metal block on one of the faces of an ophthalmic lens
EP0807673A1 (de) * 1996-05-15 1997-11-19 Hamo Ag Klebeschutzfolie für optische Gläser sowie Verfahren zu ihrer Entfernung
DE19925087C2 (de) * 1999-06-01 2002-11-21 Rmh Polymers Gmbh & Co Kg Vorrichtung zum blasen- und faltenfreien Beschichten von optischen oder elektronischen Bauteilen mit einseitig klebender Schutzfolie
DE10017363A1 (de) * 2000-04-07 2001-10-18 Rmh Polymers Gmbh & Co Kg Verfahren zum automatischen Auftragen eines Schutzlackes auf Brillenglasrohlinge
DE10017363C2 (de) * 2000-04-07 2002-04-18 Rmh Polymers Gmbh & Co Kg Verfahren zum automatischen Auftragen eines Schutzlackes auf Brillenglasrohlinge
US20060073770A1 (en) * 2002-01-09 2006-04-06 Hoya Corporation Vapor deposition crucible
US7189148B2 (en) * 2002-01-09 2007-03-13 Hoya Corporation Polishing apparatus
US20120295518A1 (en) * 2009-12-24 2012-11-22 Eric Gacoin Method for Mounting an Optical Lens to be Polished
US8951097B2 (en) * 2009-12-24 2015-02-10 Essilor International (Compagnie Generale D'optique) Method for mounting an optical lens to be polished
CN102785146A (zh) * 2011-05-17 2012-11-21 Hoya株式会社 透镜坯件及其制造方法、以及透镜的制造方法
US8659842B1 (en) * 2012-09-13 2014-02-25 Himax Technologies Limited Image capturing device and assembling method thereof
CN106334974A (zh) * 2016-10-31 2017-01-18 福建福晶科技股份有限公司 一种光学件的垂直度的加工方法

Also Published As

Publication number Publication date
DD105572A5 (pt) 1974-05-05
DE2322479A1 (de) 1973-12-13
DE2322479B2 (de) 1976-07-29
BR7303920D0 (pt) 1974-07-25
IT985891B (it) 1974-12-20
HU173588B (hu) 1979-06-28
JPS4955707A (pt) 1974-05-30
ES415017A1 (es) 1976-02-16
JPS5442116B2 (pt) 1979-12-12
FR2186441B1 (pt) 1976-08-06
GB1425903A (en) 1976-02-25
FR2186441A1 (pt) 1974-01-11
NL7307475A (pt) 1973-12-03
SU528024A3 (ru) 1976-09-05

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