EP1028921A1 - Verres a indice de refraction eleve, et verres correcteurs progressifs comportant lesdits verres - Google Patents

Verres a indice de refraction eleve, et verres correcteurs progressifs comportant lesdits verres

Info

Publication number
EP1028921A1
EP1028921A1 EP98949600A EP98949600A EP1028921A1 EP 1028921 A1 EP1028921 A1 EP 1028921A1 EP 98949600 A EP98949600 A EP 98949600A EP 98949600 A EP98949600 A EP 98949600A EP 1028921 A1 EP1028921 A1 EP 1028921A1
Authority
EP
European Patent Office
Prior art keywords
glasses
refractive index
glass
weight
high refractive
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Withdrawn
Application number
EP98949600A
Other languages
German (de)
English (en)
Other versions
EP1028921A4 (fr
Inventor
Marie J. Comte
Paulo Marques
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.)
Corning SAS
Original Assignee
Corning Inc
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 Corning Inc filed Critical Corning Inc
Publication of EP1028921A1 publication Critical patent/EP1028921A1/fr
Publication of EP1028921A4 publication Critical patent/EP1028921A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/062—Glass compositions containing silica with less than 40% silica by weight
    • C03C3/07—Glass compositions containing silica with less than 40% silica by weight containing lead
    • C03C3/072—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron
    • C03C3/074—Glass compositions containing silica with less than 40% silica by weight containing lead containing boron containing zinc

Definitions

  • the present invention relates to high refractive index inorganic glasses; said index being more specifically between 1.70 and 1.78.
  • Said glasses have particularly interesting uses as optical or ophthalmic glasses and are most particularly appropriate for manufacturing segments which enter into the making of multifocal corrective lenses.
  • Said multifocal corrective lenses which incorporate at least one segment in a glass of the invention make up an integral part of the present invention.
  • a multifocal lens is constituted of a principal lens in glass and of one or more segments in glass which are fused onto it. These segments have a higher refractive index than that of the principal lens; this enables obtaining areas of higher corrective power.
  • Said segment(s) is (are) normally soldered onto the principal lens during a heat treatment bringing the whole of the glasses to a temperature close to the softening point of the glass constituting the principal lens. Consequently, the segment glasses must have characteristics of viscosity close to those of the glass of the principal lens. It must also have close thermal expansion characteristics, so that the resulting soldering has a very low strain level.
  • the objective of the present invention was to obtain glasses of refractive index between 1.70 and 1.78, fusible particularly to an ophthalmic glass manufactured by the Applicant Company (Corning S.A.), of index 1.6, of Abbe number 41 and which has the following physical characteristics: thermal expansion coefficient : 100 x 10 "7 K "1 (between 25 and 300°C), softening point : 610°C, - strain point : 460°C, annealing point : 490°C.
  • the glasses of the invention must have a thermal expansion coefficient between about 90 and 1 10 x 10 "7 K "1 and a softening point between about 570 and 620°C.
  • said glasses of the invention have: a low tendency to devitrify and a high liquidus viscosity (> 10 Pa.s); which facilitates their forming and limits their costs of production; and as much as possible, a good chemical durability.
  • said glasses having the specifications above, have furthermore a good chemical durability.
  • the Applicant has, in an entirely surprising way, obtained glasses having the specifications above (thus having notably a liquidus viscosity equal to or greater than
  • the glasses of the invention have the properties required for the specifications as given above.
  • the Applicant proposes a solution (glass compositions) which is entirely original.
  • the Applicant proposes novel glasses having the following composition of oxides, expressed in percentages by weight:
  • the glasses of the invention are obtained essentially from the oxides identified above, taken in the amount specified above. It is certainly not excluded that other oxides intervene (vide infra) but, in any case, said other oxides do not intervene in significant amounts (always ⁇ 5%, generally ⁇ 3% by weight, even ⁇ 1% by weight) and do not have a significant influence upon the properties sought after. They only intervene for adjustments.
  • the principal constituents of the glasses of the invention are SiO, and PbO. Said glasses also contain B 2 O 3 , Li 2 O, Na 2 O, BaO, La 2 0 3 and Ti0 2 . As regards the optional components (K 2 O, ZnO, ZrO 2 and Nb 2 0 5 ). it is specified here, to all useful ends, that the minimal intervening amount from which they exert a significant effect is generally in the order of 0.5%. Thus, the glasses of the invention can contain none of these optical constituents or, if they do contain them, it is generally in a minimal amount of 0.5% (% by weight).
  • the glasses having the following composition of oxides expressed in percentages by weight:
  • These preferred glasses of the invention have a very good chemical durability, which is very interesting for glasses of optical quality.
  • those glasses are more particularly preferred which have the following composition of oxides expressed in percentages by weight:
  • the high refractive index (1.70 ⁇ n ⁇ 1.78) of the glasses of the invention is mainly obtained by virtue of the high PbO content. That is why the minimal content of this element must be 28%.
  • the maximal content is limited to 40% since beyond this, the glass has a high density and a high dispersion.
  • the alkali metal oxides (Li 2 O, Na 2 O and optionally K 2 O) in the proportions indicated above enable obtaining the expansion and the characteristics of viscosity sought after. Li 2 O, in particular, decreases the softening point very strongly.
  • this element reduces the devitrification temperature. This is why at least 0.5% of it is introduced. Furthermore, this element has the advantage of decreasing the viscosity whilst having little influence upon the dilation. However, at more than 5% intervention of said element, the softening point is too low. BaO, La 2 O 3 and ZnO enable adjusting the index and the viscosity of the glass.
  • the chemical durability of the glasses of the invention depends upon their SiO 2 and TiO 2 contents. This is why, in the preferred field, the contents of these elements are at least 30 and 4.5%. At more than 35% of SiO 2 it is difficult to keep the refractive index, the softening point and the expansion desired; while more than 8% of TiO 2 , the devitrification is degraded.
  • ZrO 2 and Nb 2 O 5 contribute advantageously to obtaining high index.
  • too high ZrO 2 content causes a devitrification at low viscosity while the level of Nb 2 O 5 is limited because this element is very expensive.
  • oxides such as Al 2 O 3 , MgO, CaO and SrO can also be added. Their total content must not go over 5% (by weight).
  • bleaching agents can be added. It is also possible to color the glass by adding conventional coloring elements, e.g. transition metal oxides or rare earth oxides.
  • conventional coloring elements e.g. transition metal oxides or rare earth oxides.
  • the conventional starting materials such as oxides, carbonates and nitrates, can be used for the preparation of the fillers to be melted.
  • the usual precautions, as to the purity of said intervening starting materials, for obtaining optical glasses suffice (obviously if it is desired to obtain glasses of optical quality).
  • the present invention relates to the use of the glasses having the original compositions specified above for the production of segments, of high refractive index, of multifocal corrective lenses.
  • another objective of the present invention is multifocal corrective lenses which comprise, in a manner known per se, a principal lens in a glass of relatively low refractive index and at least one segment soldered to said principal lens in a glass of higher refractive index; said segment(s) being characteristically in an original glass of the invention.
  • Said multifocal corrective lenses of the invention generally comprise one sole segment of this type in their structure. The intervention of several of said segments is however in no way excluded.
  • the glasses of the invention have been most particularly developed to be fused with a glass (Code 8008) having the characteristics below: thermal expansion coefficient : 100 x 10 "7 K "1 (between 25 and 300°C); softening point : 610°C; refractive index : 1.6.
  • the invention within the context of its second objective, relates more particularly to a multifocal corrective lenses whose principal lens is in said glass
  • the invention is illustrated in a totally non-limiting manner by Examples 1, 2, 3 and 4 below.
  • the glass of Example 4 is a particularly preferred glass of the invention.
  • glasses of the invention According to an operating method specified below, glasses of the invention have been prepared whose compositions are given in the Table 1 below. Said compositions are expressed in percentages by weight.
  • the softening point or Littleton point is the temperature at which the viscosity of the glass is 10 65 Pa.s. (10 7 5 poises).
  • the liquidus was determined by bringing the glass samples to the temperatures given for 17 hours. It is considered that the liquidus has been passed over when a microscopic observation does not show the presence of crystals after this treatment.
  • the durability was estimated by a test commonly used for ophthalmic applications, namely the A.O. test which consists of immersing a sample, whose every side have been polished, for 10 minutes in a 10% (by weight) solution of hydrochloric acid kept at 25°C, and by measuring the loss of weight. This loss of weight is then brought back to the surface unit.
  • the glasses of the preferred field of the invention have a loss of weight lower than 0.2 mg/cm 2 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Eyeglasses (AREA)

Abstract

L'invention concerne des verres ayant un indice de réfraction élevé, dont la composition en oxydes, exprimée en pourcentages en poids, est la suivante: SiO2 29 à 35, B2O3 0,5 à 5, Li2O 0,5 à 3, Na2O 4 à 8, K2O 0 à 2, PbO 28 à 40, BaO 4 à 14, La2O3 4 à 12, TiO2 3 à 8, ZnO 0 à 8, ZrO2 0 à 4, Nb2O5 0 à 5, avec Li2O + Na2O + K2O compris entre 5,5 et 9. L'invention concerne également l'utilisation desdits verres pour la production de segments de verres correcteurs progressifs, ainsi que des verres correcteurs progressifs comportant dans leur structure au moins un de ces segments.
EP98949600A 1997-10-10 1998-09-29 Verres a indice de refraction eleve, et verres correcteurs progressifs comportant lesdits verres Withdrawn EP1028921A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9712664 1997-10-10
FR9712664A FR2769618B1 (fr) 1997-10-10 1997-10-10 Verres a indice de refraction eleve, lentilles correctrices multifocales les incorporant
PCT/US1998/020350 WO1999019266A1 (fr) 1997-10-10 1998-09-29 Verres a indice de refraction eleve, et verres correcteurs progressifs comportant lesdits verres

Publications (2)

Publication Number Publication Date
EP1028921A1 true EP1028921A1 (fr) 2000-08-23
EP1028921A4 EP1028921A4 (fr) 2006-04-05

Family

ID=9512066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98949600A Withdrawn EP1028921A4 (fr) 1997-10-10 1998-09-29 Verres a indice de refraction eleve, et verres correcteurs progressifs comportant lesdits verres

Country Status (6)

Country Link
EP (1) EP1028921A4 (fr)
JP (1) JP2001519316A (fr)
CN (1) CN1272832A (fr)
BR (1) BR9812743A (fr)
FR (1) FR2769618B1 (fr)
WO (1) WO1999019266A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MXPA03000625A (es) 2001-03-13 2003-05-23 Corning Inc Vidrio de segmento oftalmico con alto nd.
DK174792B1 (da) * 2001-09-07 2003-11-24 Coloplast As Emballage til en stomiindretning
DE112006000203T5 (de) * 2005-01-17 2007-12-13 Kabushiki Kaisha Ohara, Sagamihara Glas
WO2018155105A1 (fr) * 2017-02-24 2018-08-30 日本電気硝子株式会社 Verre optique
JP7134396B2 (ja) * 2017-02-24 2022-09-12 日本電気硝子株式会社 光学ガラス

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508433A1 (fr) * 1981-06-24 1982-12-31 Corning Glass Works Verres ophtalmiques a indice de refraction eleve
FR2531064A1 (fr) * 1982-08-02 1984-02-03 Schott Glaswerke Verres au plomb fortement absorbants pour ecrans de tubes cathodiques
JPS60221338A (ja) * 1984-04-12 1985-11-06 Ohara Inc 光学ガラス
JPH01308843A (ja) * 1988-02-26 1989-12-13 Ohara Inc 光学ガラス

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5284211A (en) * 1975-12-19 1977-07-13 Obara Optical Glass Optical glass
JPS6096541A (ja) * 1983-10-27 1985-05-30 Hoya Corp 多焦点眼鏡レンズ用ガラス
JPH042628A (ja) * 1990-04-19 1992-01-07 Alps Electric Co Ltd プレスレンズ用光学ガラス
US5162826A (en) * 1991-06-17 1992-11-10 Corning Incorporated High index ophthalmic glasses
JP3194835B2 (ja) * 1994-06-30 2001-08-06 ホーヤ株式会社 光学ガラス

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508433A1 (fr) * 1981-06-24 1982-12-31 Corning Glass Works Verres ophtalmiques a indice de refraction eleve
FR2531064A1 (fr) * 1982-08-02 1984-02-03 Schott Glaswerke Verres au plomb fortement absorbants pour ecrans de tubes cathodiques
JPS60221338A (ja) * 1984-04-12 1985-11-06 Ohara Inc 光学ガラス
JPH01308843A (ja) * 1988-02-26 1989-12-13 Ohara Inc 光学ガラス

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 7735 Derwent Publications Ltd., London, GB; Class L01, AN 77-61694Y XP002068766 & JP 52 084211 A (OHARA OPTICAL GLASS) 13 July 1977 (1977-07-13) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 090 (C-337), 8 April 1986 (1986-04-08) & JP 60 221338 A (OBARA KOUGAKU GLASS SEIZOUSHIYO:KK), 6 November 1985 (1985-11-06) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 100 (C-0693), 23 February 1990 (1990-02-23) & JP 01 308843 A (OHARA INC), 13 December 1989 (1989-12-13) *
See also references of WO9919266A1 *

Also Published As

Publication number Publication date
FR2769618B1 (fr) 2000-01-21
FR2769618A1 (fr) 1999-04-16
JP2001519316A (ja) 2001-10-23
WO1999019266A1 (fr) 1999-04-22
BR9812743A (pt) 2000-08-29
EP1028921A4 (fr) 2006-04-05
CN1272832A (zh) 2000-11-08

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