JPS5484750A - Spectacle lens - Google Patents

Spectacle lens

Info

Publication number
JPS5484750A
JPS5484750A JP14951277A JP14951277A JPS5484750A JP S5484750 A JPS5484750 A JP S5484750A JP 14951277 A JP14951277 A JP 14951277A JP 14951277 A JP14951277 A JP 14951277A JP S5484750 A JPS5484750 A JP S5484750A
Authority
JP
Japan
Prior art keywords
plane
sightedness
correcting position
principal meridian
umbilical point
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.)
Pending
Application number
JP14951277A
Other languages
Japanese (ja)
Inventor
Hideaki Umezaki
Masaru Egawa
Hiroichi Deguchi
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP14951277A priority Critical patent/JPS5484750A/en
Publication of JPS5484750A publication Critical patent/JPS5484750A/en
Pending legal-status Critical Current

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  • Eyeglasses (AREA)

Abstract

PURPOSE: To eliminate fluctuations of an image in the medium vision position, by providing a part, which is not an umbilical point, in the plane running along the principal meridian in the near -sightedness correcting position, and providing an umbilical point curve in the horizontal direction of the medium vision correcting position so as to remove astigmatism in the near-sightedness correcting position.
CONSTITUTION: In the long-sightedness correcting position F, the intersecting line group formed by the plane orthogonal to the principal meridian M-M' and the refracted plane is not circular, and the curvature increases as going away from the meridian M-M'. The near-sightedness correcting position N is a part of aspherical face symmetrical with respect to the axis of rotation, and the curvature decreases in the peripheral region, and a part not an umbilical point is provided in at least one part on the plane running along the principal meridian M-M'. In the medium vision correcting position P, the intersecting line group Cn-Cn' formed by the plane Ln orthogonal to the principal meridian M-M' and the refracted plane contains a curve which is not circular. And the plane running along a certain intersecting line Cn-Cn' is made in an umbilical point. By thus constituting, the visions for both near-and long-sightedness may by clear, and the image fluctuations in the medium vision are eliminated, so that an excellent imaging performance may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
JP14951277A 1977-12-13 1977-12-13 Spectacle lens Pending JPS5484750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14951277A JPS5484750A (en) 1977-12-13 1977-12-13 Spectacle lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14951277A JPS5484750A (en) 1977-12-13 1977-12-13 Spectacle lens

Publications (1)

Publication Number Publication Date
JPS5484750A true JPS5484750A (en) 1979-07-05

Family

ID=15476754

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14951277A Pending JPS5484750A (en) 1977-12-13 1977-12-13 Spectacle lens

Country Status (1)

Country Link
JP (1) JPS5484750A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7731357B2 (en) 2005-06-24 2010-06-08 Hoya Corporation Method for designing group of bi-aspherical type progressive-power lenses, and group of bi-aspherical type progressive-power lenses

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7731357B2 (en) 2005-06-24 2010-06-08 Hoya Corporation Method for designing group of bi-aspherical type progressive-power lenses, and group of bi-aspherical type progressive-power lenses

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