JPS5632120A - Spectacle lens - Google Patents

Spectacle lens

Info

Publication number
JPS5632120A
JPS5632120A JP10796579A JP10796579A JPS5632120A JP S5632120 A JPS5632120 A JP S5632120A JP 10796579 A JP10796579 A JP 10796579A JP 10796579 A JP10796579 A JP 10796579A JP S5632120 A JPS5632120 A JP S5632120A
Authority
JP
Japan
Prior art keywords
curvature
vision part
intersection
main meridian
radius
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.)
Granted
Application number
JP10796579A
Other languages
Japanese (ja)
Other versions
JPS5942285B2 (en
Inventor
Sakio Okazaki
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 JP54107965A priority Critical patent/JPS5942285B2/en
Publication of JPS5632120A publication Critical patent/JPS5632120A/en
Publication of JPS5942285B2 publication Critical patent/JPS5942285B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Eyeglasses (AREA)

Abstract

PURPOSE: To provide a lens which minimizes distortion aberrations and is convenient for daily use by having a far sight correcting portion in the upper area of the lens and a near sight correcting portion in the lower area and providing the intermediate region thereof while changing the curvature with a noncircular curve.
CONSTITUTION: A far vision part F, an intermediate part P and a near vision part N are provided and the boundaries of these are connected continuously. The portions from the far vision part F up to the near vision part are made umbilical over the entire line so as to minimize astigmatism along the main meridian M-M'. Namely, the radii of curvature in the main radius of curvature direction are equal points and are spherical when viewed microscopically. Below the far vision part F, the line of intersection that the plane normal to the main meridian M-M' and the lens refractive surface assume is the noncircular curve of which the value of the radius of curvature decreases as it goes further from the point of intersection with the main meridian. Above the near vision part N, it is such a noncircular curve of which the value of the radius of curvature increases first then decreases as it goes further from the point of intersection with the main meridian.
COPYRIGHT: (C)1981,JPO&Japio
JP54107965A 1979-08-24 1979-08-24 eyeglass lenses Expired JPS5942285B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54107965A JPS5942285B2 (en) 1979-08-24 1979-08-24 eyeglass lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54107965A JPS5942285B2 (en) 1979-08-24 1979-08-24 eyeglass lenses

Publications (2)

Publication Number Publication Date
JPS5632120A true JPS5632120A (en) 1981-04-01
JPS5942285B2 JPS5942285B2 (en) 1984-10-13

Family

ID=14472547

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54107965A Expired JPS5942285B2 (en) 1979-08-24 1979-08-24 eyeglass lenses

Country Status (1)

Country Link
JP (1) JPS5942285B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221723A (en) * 1988-02-29 1989-09-05 Nikon Corp progressive multifocal lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220271A (en) * 1975-08-07 1977-02-16 Fuji Electric Co Ltd Buffer gas breaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220271A (en) * 1975-08-07 1977-02-16 Fuji Electric Co Ltd Buffer gas breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01221723A (en) * 1988-02-29 1989-09-05 Nikon Corp progressive multifocal lens

Also Published As

Publication number Publication date
JPS5942285B2 (en) 1984-10-13

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