JPS5639510A - Behind the lens iris - Google Patents

Behind the lens iris

Info

Publication number
JPS5639510A
JPS5639510A JP11414179A JP11414179A JPS5639510A JP S5639510 A JPS5639510 A JP S5639510A JP 11414179 A JP11414179 A JP 11414179A JP 11414179 A JP11414179 A JP 11414179A JP S5639510 A JPS5639510 A JP S5639510A
Authority
JP
Japan
Prior art keywords
lens
lenses
iris
positive
behind
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
JP11414179A
Other languages
Japanese (ja)
Other versions
JPH0118402B2 (en
Inventor
Toshiko Shimokura
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 JP11414179A priority Critical patent/JPS5639510A/en
Publication of JPS5639510A publication Critical patent/JPS5639510A/en
Publication of JPH0118402B2 publication Critical patent/JPH0118402B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)

Abstract

PURPOSE: To reduce size and improve the quantity of peripheral light in a bright behind photographic lens iris for wide angle by incorporating modified Tessar for lens type and giving numerical limitations to the optical specifications of the lens system.
CONSTITUTION: The lens system consists of both the positive meniscus 1st and 2nd lenses, the biconcave negative 3rd lenses of which the face of larger lens curvature is directed to the image side and the positive 4th lens of a cemented lens of a biconvex positive lens and a negative meniscus lens, from the front side. When the overall length is difined as Σd, the combined focal length from the 1st up to the 3rd lens as f1.2.3, the spacing between the 3rd and 4th lenses as d6, the radius of curvature of the 1st face of the 1st lens as R1, the refractive index of the 3rd lens as n3 and the Abbe number of the 4th lens as ν4, ν5, the numerical limitations 0.31f<Σd<0.34f, 1.7f<|f1,2,3|<3.5f, 0.025f<d6<0.05f, 0.31f<R1<0.33f, 1.69<n3<1.78, 12<ν5- ν4<22 are given and the iris is disposed behind. Thereby, the drawbacks are overcome and the photographic lens of 62° angle of view and F2.8 is consituted.
COPYRIGHT: (C)1981,JPO&Japio
JP11414179A 1979-09-07 1979-09-07 Behind the lens iris Granted JPS5639510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11414179A JPS5639510A (en) 1979-09-07 1979-09-07 Behind the lens iris

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11414179A JPS5639510A (en) 1979-09-07 1979-09-07 Behind the lens iris

Publications (2)

Publication Number Publication Date
JPS5639510A true JPS5639510A (en) 1981-04-15
JPH0118402B2 JPH0118402B2 (en) 1989-04-05

Family

ID=14630161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11414179A Granted JPS5639510A (en) 1979-09-07 1979-09-07 Behind the lens iris

Country Status (1)

Country Link
JP (1) JPS5639510A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860716A (en) * 1981-10-07 1983-04-11 Nippon Kogaku Kk <Nikon> Behind stop lens
JPS6081777A (en) * 1983-10-12 1985-05-09 Sanyo Electric Co Ltd Nickel-zinc battery
US11709346B2 (en) 2017-02-08 2023-07-25 Largan Precision Co., Ltd. Optical imaging system, imaging apparatus and electronic device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430027A (en) * 1977-08-11 1979-03-06 Olympus Optical Co Ltd Photographic lens of shortened type
JPS5461920A (en) * 1977-10-27 1979-05-18 Canon Inc Rear aperture large aperture photographic lens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430027A (en) * 1977-08-11 1979-03-06 Olympus Optical Co Ltd Photographic lens of shortened type
JPS5461920A (en) * 1977-10-27 1979-05-18 Canon Inc Rear aperture large aperture photographic lens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860716A (en) * 1981-10-07 1983-04-11 Nippon Kogaku Kk <Nikon> Behind stop lens
JPS6081777A (en) * 1983-10-12 1985-05-09 Sanyo Electric Co Ltd Nickel-zinc battery
US11709346B2 (en) 2017-02-08 2023-07-25 Largan Precision Co., Ltd. Optical imaging system, imaging apparatus and electronic device
US11988817B2 (en) 2017-02-08 2024-05-21 Largan Precision Co., Ltd. Optical imaging system, imaging apparatus and electronic device

Also Published As

Publication number Publication date
JPH0118402B2 (en) 1989-04-05

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