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    • 4. 发明授权
    • High strength ophthalmic lens
    • 高强度眼科镜片
    • US4042405A
    • 1977-08-16
    • US668174
    • 1976-03-18
    • David A. KrohnRobert E. GrafEmil W. Deeg
    • David A. KrohnRobert E. GrafEmil W. Deeg
    • C03C3/097C03C21/00C03C3/04C03C3/30
    • C03C3/097C03C21/00Y10T428/315
    • An ophthalmic glass lens having a compressively-stressed surface zone after ion exchanging which is at least 120 microns in depth, formed from an alkali metal oxide silicate glass comprising by weight about 4 to about 15 percent sodium oxide and about 3 to about 15 percent potassium oxide. There is a compressively-stressed surface layer having a strength of at least 25,000 psi. The total amount of sodium, potassium and other alkali metal oxides is up to about 20 percent. The total amount of zinc oxide, lanthanum oxide, magnesium oxide, and calcium oxide is about 8 to 15 percent, and there is about 3 to about 15 percent phosphorus pentoxide. An ion exchange process takes 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.
    • 一种眼用玻璃透镜,其在离子交换之后具有至少120微米深的压应力表面区域,其由碱金属氧化物硅酸盐玻璃形成,所述碱金属氧化物硅酸盐玻璃包含重量约4至约15%的氧化钠和约3至约15%的钾 氧化物。 存在具有至少25,000psi的强度的压缩应力表面层。 钠,钾和其他碱金属氧化物的总量高达约20%。 氧化锌,氧化镧,氧化镁和氧化钙的总量为约8〜15%,并且有约3〜约15%的五氧化二磷。 离子交换过程在高于或低于常规眼用冠状玻璃的应变点的温度下进行,以在眼镜玻璃透镜中产生令人满意的物理性能。
    • 7. 发明授权
    • High strength ophthalmic lens
    • 高强度眼科镜片
    • US4012131A
    • 1977-03-15
    • US606033
    • 1975-08-20
    • David A. KrohnEmil W. DeegRobert E. Graf
    • David A. KrohnEmil W. DeegRobert E. Graf
    • G02C7/02C03C3/078C03C3/085C03C3/087C03C3/091C03C21/00G02B1/00
    • C03C21/002C03C3/078C03C3/085C03C3/091Y10S501/903
    • 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 pentration 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.
    • 眼科玻璃透镜可以通过将碱金属硅酸盐玻璃暴露于离子交换过程来制备,其中玻璃通过在透镜的表面层中的钠离子的钾离子交换在高于或低于 玻璃应变点。 所制备的玻璃基本上不含氧化铝,具有足够的强度和显着增加的中性层的渗透深度,即使在制备玻璃时使用高达约6%的石灰。 在离子交换过程中石灰作为扩散阻滞剂的作用可以克服(1)通过使用适量的锌或氧化镁或其混合物,以便在离子交换过程中保持足够的扩散速率(2 ),通过制备基本上不含氧化铝的玻璃。