GB612828A - Improvements in abrading laps for optical glass surfaces - Google Patents

Improvements in abrading laps for optical glass surfaces

Info

Publication number
GB612828A
GB612828A GB37346A GB37346A GB612828A GB 612828 A GB612828 A GB 612828A GB 37346 A GB37346 A GB 37346A GB 37346 A GB37346 A GB 37346A GB 612828 A GB612828 A GB 612828A
Authority
GB
United Kingdom
Prior art keywords
abrading
cellulose
cellulose acetate
pict
lap
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
GB37346A
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to GB37346A priority Critical patent/GB612828A/en
Publication of GB612828A publication Critical patent/GB612828A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • B24B13/023—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made for grinding several lenses simultaneously

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

<PICT:0612828/IV(a)/1> <PICT:0612828/IV(a)/2> The abrading and/or polishing steps in cold working an optical surface on glass are carried out using a lap having a working surface comprising a thermoplastic synthetic resin or cellulose derivative moulding composition corresponding in shape to the optical surface to be produced and having a softening point above 95 DEG F. Thermoplastic resins specified are polystyrene, methylmethacrylate, vinyl resins, polyvinylidene chloride, while cellulose derivatives are cellulose acetate and acetobutyrate, ethyl cellulose, and oxidized cellulose acetate prepared as described in U.S.A. Specification 2,358,064 and used in conjunction with plasticizers comprising methyl phthalyl ethyl glycollate, triacetin, dimethyl phthalate dibutyl tartrate, camphor, diethyl phthalate, and tripropionin. An abrading lap for use as above comprises a metal supporting member 18, Fig. 2, and a synthetic resin mass 17. In Fig. 3, the metal support 20 is embedded in a mass of cellulose acetate composed of layers having different compositions and hardness.
GB37346A 1946-01-04 1946-01-04 Improvements in abrading laps for optical glass surfaces Expired GB612828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB37346A GB612828A (en) 1946-01-04 1946-01-04 Improvements in abrading laps for optical glass surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB37346A GB612828A (en) 1946-01-04 1946-01-04 Improvements in abrading laps for optical glass surfaces

Publications (1)

Publication Number Publication Date
GB612828A true GB612828A (en) 1948-11-18

Family

ID=9703269

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37346A Expired GB612828A (en) 1946-01-04 1946-01-04 Improvements in abrading laps for optical glass surfaces

Country Status (1)

Country Link
GB (1) GB612828A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703470A (en) * 1953-01-23 1955-03-08 Mitchel Tyler Company Lens grinding apparatus
US2822647A (en) * 1955-12-16 1958-02-11 Younger Mfg Company Method and apparatus for forming bifocal lenses
GB2196886A (en) * 1986-10-03 1988-05-11 Wylde J & S Ltd Lens tool
CN113462947A (en) * 2021-06-18 2021-10-01 厦门钨业股份有限公司 WC-based hard alloy and application thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703470A (en) * 1953-01-23 1955-03-08 Mitchel Tyler Company Lens grinding apparatus
US2822647A (en) * 1955-12-16 1958-02-11 Younger Mfg Company Method and apparatus for forming bifocal lenses
GB2196886A (en) * 1986-10-03 1988-05-11 Wylde J & S Ltd Lens tool
GB2196886B (en) * 1986-10-03 1991-02-06 Wylde J & S Ltd A lens tool
CN113462947A (en) * 2021-06-18 2021-10-01 厦门钨业股份有限公司 WC-based hard alloy and application thereof

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