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    • 10. 发明公开
    • Method of making multifocal lens blanks
    • Verfahren zur Herstellung von VorformenfürMultifokallinsen。
    • EP0314956A1
    • 1989-05-10
    • EP88117013.8
    • 1988-10-13
    • Corning Glass Works
    • Buckley, Milford Leland
    • C03B23/22
    • C03B23/22
    • There is disclosed an improved method of assembling and fusing the segment (21, 23) and major elements (12) of a multifocal lens blank that employs glass spacer members (24) to space the segment (21, 23) from the major element (12) and allow the segment (21, 23) to progressively slump into sealing relationship with the major (12) as fusion temperature is approached. The glass spacer member (24) has a softening point that is lower than that of the major element glass (18) and may approximate that of the segment glass (21).
    • 公开了一种改进的组装和熔合多焦点透镜毛坯的片段(21,23)和主要元件(12)的方法,该多焦点透镜毛坯采用玻璃间隔件(24)以将片段(21,23)与主要元件 12),并且当接近熔化温度时,允许段(21,23)逐渐与主要(12)坍塌成密封关系。 玻璃间隔件24的软化点低于主要元件玻璃18的软化点,并且可以接近分段玻璃21的软化点。