JPS5484754A - Spectacle lens - Google Patents

Spectacle lens

Info

Publication number
JPS5484754A
JPS5484754A JP15082677A JP15082677A JPS5484754A JP S5484754 A JPS5484754 A JP S5484754A JP 15082677 A JP15082677 A JP 15082677A JP 15082677 A JP15082677 A JP 15082677A JP S5484754 A JPS5484754 A JP S5484754A
Authority
JP
Japan
Prior art keywords
correcting position
sightedness
plane
intersecting line
principal meridian
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
JP15082677A
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 JP15082677A priority Critical patent/JPS5484754A/en
Publication of JPS5484754A publication Critical patent/JPS5484754A/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 part of the plane running long the principal meridian in the near-sightedness correcting position, and providing a curve of which vertical direction component of the prism is constant in the medium vision correcting position.
CONSTITUTION: The long-sightedness correcting position F of variable focal spectacle lens is a part of aspherical face symmetrical with respect to the axis of rotation of which curvature increases in the peripheral part. The near-sightedness correcting position N is a part of aspherical face symmetrical with respect to the axis of rotation of which curvature decreases in the peripheral part, and has a part which is not an umbilical point provided in at least one part in 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 also 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
JP15082677A 1977-12-14 1977-12-14 Spectacle lens Pending JPS5484754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15082677A JPS5484754A (en) 1977-12-14 1977-12-14 Spectacle lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15082677A JPS5484754A (en) 1977-12-14 1977-12-14 Spectacle lens

Publications (1)

Publication Number Publication Date
JPS5484754A true JPS5484754A (en) 1979-07-05

Family

ID=15505239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15082677A Pending JPS5484754A (en) 1977-12-14 1977-12-14 Spectacle lens

Country Status (1)

Country Link
JP (1) JPS5484754A (en)

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