GB1032541A - Ophthalmic lens and method of making same - Google Patents

Ophthalmic lens and method of making same

Info

Publication number
GB1032541A
GB1032541A GB3990162A GB3990162A GB1032541A GB 1032541 A GB1032541 A GB 1032541A GB 3990162 A GB3990162 A GB 3990162A GB 3990162 A GB3990162 A GB 3990162A GB 1032541 A GB1032541 A GB 1032541A
Authority
GB
United Kingdom
Prior art keywords
axis
tool
radius
lens
grinding
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
GB3990162A
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
Publication of GB1032541A publication Critical patent/GB1032541A/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
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • 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
    • 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

  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)

Abstract

1,032,541. Grinding lenses. J. C. BAND. Oct. 22, 1962 [Nov. 3, 1961], No. 39901/62. Heading B3D. [Also in Division G2] A lens, lap or mould for a lens surface is ground to a surface of revolution of the circoid type as defined by the formula: r<SP>2</SP>+z<SP>2</SP>=a<SP>2</SP>+ u<SP>2</SP> + v<SP>2</SP> - 2u [a<SP>2</SP> - (v cot I - z csc I)<SP>2</SP>]¢, where a, u, v, I are greater than zero, I less than 90 degrees, I is the angle of inclination between a line parallel to the work axis about which material is rotated while being shaped and a tool axis intersected by that line, u is the skewness or spacing between the work and tool axes measured along their common perpendicular, # is the distance along the tool axis from the centre of the tool circle to the common perpendicular, a is the radius of the tool circle, z is the distance along the work axis from the common perpendicular to a given plane through the lens material perpendicular to the work axis, and r is the radius of the circle cut out in the lens material in the given plane. As shown in Fig. 5, the lens blanks 23 are adhered to a workholder 24 which is rotatable about the work axis by a motor 12. The tool is a cup-shaped grinding-wheel 25 whose grinding rim is of effective radius a, and is rotated about the tool axis by a motor 21. The displacement v is set by one or both of hand wheels 16, 22, and read on scales 29, 30; the skewness u is set by hand wheel 27 and read on scale 28, and the inclination I is set by hand wheel 20 and read on scale 26. In a modification, r and z may be replaced by R and Z, where R=r-b sin #; Z=z-b dz cos #; tan # = - and 0 is the angle of inclinadr tion of the lens surface normal to the work axis for the actual surface at the point R, Z, and the grinding cup wheel has a grinding rim semitoric in shape the torus being generated by the rotation of a semi-circle of radius b in the plane containing the symmetry axis of the cup wheel about that axis and with the centre of the semicircle at a distance a from the axis and of radius b. The cup wheel may be in the form of a hollow aluminium cylinder surmounted by a toric sector covered with a thin layer of electrolytic copper impregnated with diamond dust.
GB3990162A 1961-11-03 1962-10-22 Ophthalmic lens and method of making same Expired GB1032541A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15211861A 1961-11-03 1961-11-03

Publications (1)

Publication Number Publication Date
GB1032541A true GB1032541A (en) 1966-06-08

Family

ID=22541583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3990162A Expired GB1032541A (en) 1961-11-03 1962-10-22 Ophthalmic lens and method of making same

Country Status (2)

Country Link
DE (1) DE1422558A1 (en)
GB (1) GB1032541A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000832A1 (en) * 1990-07-12 1992-01-23 Loh Optical Machinery, Inc. Computer controlled lens surfacer
US5231587A (en) * 1990-07-12 1993-07-27 Loh Optical Machinery, Inc. Computer controlled lens surfacer
CN115008296A (en) * 2022-06-30 2022-09-06 郴州旗滨光伏光电玻璃有限公司 Grinding wheel grinding amount control system and grinding wheel grinding amount control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992000832A1 (en) * 1990-07-12 1992-01-23 Loh Optical Machinery, Inc. Computer controlled lens surfacer
US5231587A (en) * 1990-07-12 1993-07-27 Loh Optical Machinery, Inc. Computer controlled lens surfacer
CN115008296A (en) * 2022-06-30 2022-09-06 郴州旗滨光伏光电玻璃有限公司 Grinding wheel grinding amount control system and grinding wheel grinding amount control method

Also Published As

Publication number Publication date
DE1422558A1 (en) 1969-05-29

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