GB822985A - Improvements in or relating to methods of and apparatus for, producing multifocal lens blanks and multifocal lens blanks so produced - Google Patents

Improvements in or relating to methods of and apparatus for, producing multifocal lens blanks and multifocal lens blanks so produced

Info

Publication number
GB822985A
GB822985A GB19230/57A GB1923057A GB822985A GB 822985 A GB822985 A GB 822985A GB 19230/57 A GB19230/57 A GB 19230/57A GB 1923057 A GB1923057 A GB 1923057A GB 822985 A GB822985 A GB 822985A
Authority
GB
United Kingdom
Prior art keywords
multifocal lens
lens blanks
blanks
relating
produced
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
Application number
GB19230/57A
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.)
American Optical Corp
Original Assignee
American Optical Corp
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 American Optical Corp filed Critical American Optical Corp
Publication of GB822985A publication Critical patent/GB822985A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/22—Uniting glass lenses, e.g. forming bifocal lenses

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

822,985. Multi-focal lenses. AMERICAN OPTICAL CO. June 18, 1957 [June 22, 1956], No. 19230/57. Class 56. Multi-focal lenses are made by positioning major blanks 10 having countersinks 12 therein in overlapping relationship in holders 32 on a conveyer 16 traversing a tunnel 46 surrounded by heaters 56, 60, 64 of different intensities. The blanks pass under an opening 72 in the tunnel roof through which a continuous ribbon 14 of glass descends from a heated tank 68 to mould and fuse itself into the countersinks as a continuous strip. The blanks and attached strip continue to move through the annealing furnace 54 whereafter the ribbon is broken between each blank so that the part fused in the countersink forms the blank of the minor segment.
GB19230/57A 1956-06-22 1957-06-18 Improvements in or relating to methods of and apparatus for, producing multifocal lens blanks and multifocal lens blanks so produced Expired GB822985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US822985XA 1956-06-22 1956-06-22

Publications (1)

Publication Number Publication Date
GB822985A true GB822985A (en) 1959-11-04

Family

ID=22170316

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19230/57A Expired GB822985A (en) 1956-06-22 1957-06-18 Improvements in or relating to methods of and apparatus for, producing multifocal lens blanks and multifocal lens blanks so produced

Country Status (1)

Country Link
GB (1) GB822985A (en)

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