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    ION EXCHANGEABLE SEGMENT GLASS
    24.
    发明专利
    ION EXCHANGEABLE SEGMENT GLASS 未知

    公开(公告)号：CA1083821A

    公开(公告)日：1980-08-19

    申请号：CA262338

    申请日：1976-09-29

    Applicant: AMERICAN OPTICAL CORP

    Inventor： KROHN DAVID A ,  GRAF ROBERT E ,  DEEG EMIL W

    IPC: C03C3/076 ,  C03C3/095 ,  C03C21/00 ,  G02C7/06

    Abstract: ION EXCHANGEABLE SEGMENT GLASS There is disclosed an ion exchange-strengthened ophthalmic segment glass suitable for the fabrication of fused bifocal and trifocal ophthalmic lenses. More particularly, there is disclosed a lanthanum-silicate based ophthalmic segment glass having indices of refraction of about 1.57 to about 1.65 which is suitable for chemical ion exchange strengthening so as to develop a compressively-stressed ion-exchanged surface layer having a depth of at least 60 micrometers.

    HIGH STRENGTH OPHTHALMIC LENS
    25.
    发明专利
    HIGH STRENGTH OPHTHALMIC LENS 未知

    公开(公告)号：CA1083820A

    公开(公告)日：1980-08-19

    申请号：CA257489

    申请日：1976-07-21

    Applicant: AMERICAN OPTICAL CORP

    Inventor： KROHN DAVID A ,  DEEG EMIL W ,  GRAF ROBERT E

    IPC: G02C7/02 ,  C03C3/078 ,  C03C3/085 ,  C03C3/087 ,  C03C3/091 ,  C03C21/00 ,  G02B1/00

    Abstract: HIGH STRENGTH OPHTHALMIC LENS An ophthalmic glass lens can be prepared by exposing an alkali metal silicate glass to an ion exchange process in which the glass is chemically strengthened by an exchange of potassium ions for sodium ions in the surface layer of the lens at a temperature either above or below the strain point of the glass. The glasses prepared are essentially free of alumina, have adequate strength and substantially increased depth of penetration of the neutral zone even when up to about 6 percent lime is utilized in the preparation of the glass. The effect of lime as a diffusion-retarding agent during the ion exchange process can be overcome (1) by use of an appropriate amount of zinc or magnesium oxide or mixtures thereof so as to maintain an adequate rate of diffusion during ion exchange or (2) by preparation of the glass essentially free of alumina.

    HIGH STRENGTH OPHTHALMIC LENS
    26.
    发明专利
    HIGH STRENGTH OPHTHALMIC LENS 未知

    公开(公告)号：CA1073678A

    公开(公告)日：1980-03-18

    申请号：CA254261

    申请日：1976-06-07

    Applicant: AMERICAN OPTICAL CORP

    Inventor： KROHN DAVID A ,  GRAF ROBERT E ,  DEEG EMIL W

    IPC: G02C7/02 ,  C03C3/076 ,  C03C3/095 ,  C03C21/00 ,  G02B1/00

    Abstract: HIGH STRENGTH OPHTHALMIC LENS An ophthalmic glass lens having a compressively stressed surface zone after ion exchanging which is at least 60 micrometers in depth can be formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide, about 3 to about 15 percent potassium oxide provided the total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent and about 3 to about 15 percent lanthanum oxide. The ion exchange process can take place at a temperature either above or below the strain point of conventional ophthalmic crown glass to produce satisfactory physical properties in the ophthalmic glass lens.

    PHOTOCHROMIC GRADIENT LENSES
    27.
    发明专利
    PHOTOCHROMIC GRADIENT LENSES 未知

    公开(公告)号：CA1061618A

    公开(公告)日：1979-09-04

    申请号：CA251044

    申请日：1976-04-26

    Applicant: AMERICAN OPTICAL CORP

    Inventor： KROHN DAVID A ,  DEEG EMIL W

    IPC: C03B32/00 ,  C03C3/062 ,  C03C3/11 ,  C03C3/118 ,  C03C4/06 ,  C03C21/00 ,  G02C7/10 ,  G02B1/00 ,  C03C3/26 ,  C03C3/30

    Abstract: PHOTOCHROMIC GRADIENT LENSES The invention achieves local variation, or a continuous gradation, in photochromic or phototropic properties across the face of glass lenses and lens blanks, especially those of ophthalmic quality. The lenses and lens blanks contain all those ingredients required to produce photochromic o? phototropic behavior. They are exposed to a locally variable temperature field or environment, in such manner as to, in at least one portion of the lens or lens blank cause the temperature therein to exceed the strain point but not the softening point of the glass. In other portions of the lens or lens blank the temperature is below the strain point, thus causing development of phototropic or photochromic behavior only in those portions of the lens or lens blank exposed to the temperatures above the strain point.

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