GB235817A - Improvements in and relating to optical lenses - Google Patents

Improvements in and relating to optical lenses

Info

Publication number
GB235817A
GB235817A GB747025A GB747025A GB235817A GB 235817 A GB235817 A GB 235817A GB 747025 A GB747025 A GB 747025A GB 747025 A GB747025 A GB 747025A GB 235817 A GB235817 A GB 235817A
Authority
GB
United Kingdom
Prior art keywords
lens
lenses
glass
spectacle
remainder
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
GB747025A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB747025A priority Critical patent/GB235817A/en
Publication of GB235817A publication Critical patent/GB235817A/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
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

235,817. Ustonson, C. B. March 19, 1925. Spectacle lenses.- Spectacle lenses having three different focal section are constructed with the reading section formed by a fused insertion of glass of a different character to the remainder of the lens and entirely surrounded by the intermediate section. In manufacture two lenses are made from a circular disc a of spectacle glass by grinding recesses b near the centre and inserting pieces of flint glass c as shown. The outer surface is then worked, producing a reading lens at the fused parts c, and an intermediate lens d, the remainder of the lens forming a distance lens. The disc a is then divided between the lenses c and edged.
GB747025A 1925-03-19 1925-03-19 Improvements in and relating to optical lenses Expired GB235817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB747025A GB235817A (en) 1925-03-19 1925-03-19 Improvements in and relating to optical lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB747025A GB235817A (en) 1925-03-19 1925-03-19 Improvements in and relating to optical lenses

Publications (1)

Publication Number Publication Date
GB235817A true GB235817A (en) 1925-06-25

Family

ID=9833712

Family Applications (1)

Application Number Title Priority Date Filing Date
GB747025A Expired GB235817A (en) 1925-03-19 1925-03-19 Improvements in and relating to optical lenses

Country Status (1)

Country Link
GB (1) GB235817A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517609A (en) * 1945-08-02 1950-08-08 American Optical Corp Multifocal aphakic lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517609A (en) * 1945-08-02 1950-08-08 American Optical Corp Multifocal aphakic lens

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