JPS5484756A - Spectacle lens - Google Patents

Spectacle lens

Info

Publication number
JPS5484756A
JPS5484756A JP15083877A JP15083877A JPS5484756A JP S5484756 A JPS5484756 A JP S5484756A JP 15083877 A JP15083877 A JP 15083877A JP 15083877 A JP15083877 A JP 15083877A JP S5484756 A JPS5484756 A JP S5484756A
Authority
JP
Japan
Prior art keywords
plane
principal meridian
correcting position
intersecting line
sightedness
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
JP15083877A
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 JP15083877A priority Critical patent/JPS5484756A/en
Publication of JPS5484756A publication Critical patent/JPS5484756A/en
Pending legal-status Critical Current

Links

Landscapes

  • Eyeglasses (AREA)

Abstract

PURPOSE: To improve the imaging performance, 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 a curve of which vertical direction component of prism is constant in the medium vision correcting position.
CONSTITUTION: In the lone-sightedness correcting position F of variable focal spectacle lens, the intersecting line group of 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 principal meridian M-M'. The near-sightedness correcting position N is an aspherical face symmetrical with respect to the axis of non-rotation and is part of the plane of which curvature decreases as going away from the principal meridian M-M' and possesses a part which is not an umbilical point in at least one part in the plane running along the principal meridian M-M'. In the medium vision correcting position, the intersecting line group Cn-Cn' formed by the plane Ln orthogonal to the principal meridian M-M' and the refracted plane contains a shape which is not circular, and it is so constituted that the vertical component of the prism is constant along a certain intersecting line in the intersecting line group.
COPYRIGHT: (C)1979,JPO&Japio
JP15083877A 1977-12-14 1977-12-14 Spectacle lens Pending JPS5484756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15083877A JPS5484756A (en) 1977-12-14 1977-12-14 Spectacle lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15083877A JPS5484756A (en) 1977-12-14 1977-12-14 Spectacle lens

Publications (1)

Publication Number Publication Date
JPS5484756A true JPS5484756A (en) 1979-07-05

Family

ID=15505476

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15083877A Pending JPS5484756A (en) 1977-12-14 1977-12-14 Spectacle lens

Country Status (1)

Country Link
JP (1) JPS5484756A (en)

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