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JPS5699313A - Behind stop lens - Google Patents

Behind stop lens

Info

Publication number
JPS5699313A
JPS5699313A JP138480A JP138480A JPS5699313A JP S5699313 A JPS5699313 A JP S5699313A JP 138480 A JP138480 A JP 138480A JP 138480 A JP138480 A JP 138480A JP S5699313 A JPS5699313 A JP S5699313A
Authority
JP
Japan
Prior art keywords
group
lens
constitution
refractive indexes
difficulties
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
JP138480A
Other languages
Japanese (ja)
Other versions
JPH0262846B2 (en
Inventor
Toshiko Shimokura
Ryoko Watabe
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP138480A priority Critical patent/JPS5699313A/en
Publication of JPS5699313A publication Critical patent/JPS5699313A/en
Publication of JPH0262846B2 publication Critical patent/JPH0262846B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)

Abstract

PURPOSE: To provide a lens of a low cost which decreases difficulties in fabrication, by setting the refractive indexes of the glasses constituting the 3rd group lens and 4th group lens of a lens system of 4-group constitution at prescribed values.
CONSTITUTION: The 1st group is a meniscus positive lens, the 2nd group is biconcave negative lens, the 3rd group is a meniscus positive lens directing its concave side to the object side and the 4th group is a lens group consisting of a biconvex positive lens. When the refractive indexes of the glasses constituting the 3rd group and 4th group are defined as n3, n4, respectively, they are so set as to satisfy the conditions of the formula I, II. By the incorporation of the 4-group lens constitution, the sharing of powers is achieved, by which the effect of errors is decreased and the difficulties in fabrication are reduced; further, the use of glass materials of lower refractive indexes hence lower costs is made possible. The combined focal length is about 1.09W1.1 and the lens of wider angles of ≥60° covering angle is obtained.
COPYRIGHT: (C)1981,JPO&Japio
JP138480A 1980-01-11 1980-01-11 Behind stop lens Granted JPS5699313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP138480A JPS5699313A (en) 1980-01-11 1980-01-11 Behind stop lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP138480A JPS5699313A (en) 1980-01-11 1980-01-11 Behind stop lens

Publications (2)

Publication Number Publication Date
JPS5699313A true JPS5699313A (en) 1981-08-10
JPH0262846B2 JPH0262846B2 (en) 1990-12-26

Family

ID=11499980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP138480A Granted JPS5699313A (en) 1980-01-11 1980-01-11 Behind stop lens

Country Status (1)

Country Link
JP (1) JPS5699313A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983026A (en) * 1986-12-27 1991-01-08 Minolta Camera Kabushiki Kaisha Focal length changeable lens system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509468U (en) * 1973-05-30 1975-01-30
JPS5238218A (en) * 1975-08-13 1977-03-24 Bell & Howell Co Optical system for macrofilm

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509468U (en) * 1973-05-30 1975-01-30
JPS5238218A (en) * 1975-08-13 1977-03-24 Bell & Howell Co Optical system for macrofilm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983026A (en) * 1986-12-27 1991-01-08 Minolta Camera Kabushiki Kaisha Focal length changeable lens system
US5086355A (en) * 1986-12-27 1992-02-04 Minolta Camera Kabushiki Kaisha Focal length changeable lens system

Also Published As

Publication number Publication date
JPH0262846B2 (en) 1990-12-26

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