GB1535285A - Device for determining the angle of construction of contact lenses for astigmatics - Google Patents

Device for determining the angle of construction of contact lenses for astigmatics

Info

Publication number
GB1535285A
GB1535285A GB2633876A GB2633876A GB1535285A GB 1535285 A GB1535285 A GB 1535285A GB 2633876 A GB2633876 A GB 2633876A GB 2633876 A GB2633876 A GB 2633876A GB 1535285 A GB1535285 A GB 1535285A
Authority
GB
United Kingdom
Prior art keywords
angle
construction
disc
degrees
modification
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
GB2633876A
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.)
VERGO
Original Assignee
VERGO
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 VERGO filed Critical VERGO
Publication of GB1535285A publication Critical patent/GB1535285A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/0005—Hand manipulated computing devices characterised by a specific application
    • G06G1/0042—Hand manipulated computing devices characterised by a specific application for optics, for photography
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
    • G06G1/04—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction
    • G06G1/08—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction with circular or helical scales

Abstract

1535285 Mechanical calculators for lenses VERGO 24 June 1976 [26 June 1975] 26338/76 Heading G4B A calculator for determining the construction angle c of contact lenses for astigmatics comprises in combination a dial I<SP>1</SP> graduated over an arc of 180 degrees; a relatively rotatable concentric disc 2<SP>1</SP> having two successive graduated scales running in the same continuous clockwise direction each in the range 0 to 180 degrees, the said disc carrying a mark representing the angle of equilibrium —; a second relatively rotatable disc 3<SP>1</SP> having a mark representing the refraction angle # and a mark C against which the construction angle is read-off since the construction angle is given by the formula #=#-—. In the above arrangement the angle c is read through a window arrangement which in a modification is dispensed with for details of which modification and modus operandi, Figs. 1-6 (not shown), should be referred to. In a further modification, the marks for angle # and c are formed by the ends of pointers. These pointers may be 180 degrees apart or at a lesser angle. In the latter case the angle of equilibrium does not coincide with the end of the scales on the disc 2<SP>1</SP>.
GB2633876A 1975-06-26 1976-06-24 Device for determining the angle of construction of contact lenses for astigmatics Expired GB1535285A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7520140A FR2330365A1 (en) 1975-06-26 1975-06-26 DEVICE FOR DETERMINING THE CONSTRUCTION ANGLE OF CONTACT LENSES FOR ASTIGMATES

Publications (1)

Publication Number Publication Date
GB1535285A true GB1535285A (en) 1978-12-13

Family

ID=9157125

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2633876A Expired GB1535285A (en) 1975-06-26 1976-06-24 Device for determining the angle of construction of contact lenses for astigmatics

Country Status (3)

Country Link
DE (1) DE2628244C3 (en)
FR (1) FR2330365A1 (en)
GB (1) GB1535285A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS579866Y2 (en) * 1979-07-23 1982-02-25
DE102009018842A1 (en) 2009-04-17 2010-10-21 Juliane Delkeskamp Visualizing disk for visualizing e.g. mediation process, has five sectors subdivided into outer fields and inner fields, where information of perception levels are specified on respective outer zones, segments and inner zones
DE202009014101U1 (en) 2009-04-17 2010-02-11 Delkeskamp, Juliane Device for visualization

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685726A (en) * 1969-05-14 1972-08-22 Shashin Kagaku Kk Processor control computer

Also Published As

Publication number Publication date
DE2628244A1 (en) 1976-12-30
FR2330365A1 (en) 1977-06-03
FR2330365B1 (en) 1978-05-19
DE2628244B2 (en) 1980-02-21
DE2628244C3 (en) 1985-11-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee