JPS5650311A - Wide-angle zoom lens system - Google Patents

Wide-angle zoom lens system

Info

Publication number
JPS5650311A
JPS5650311A JP12638879A JP12638879A JPS5650311A JP S5650311 A JPS5650311 A JP S5650311A JP 12638879 A JP12638879 A JP 12638879A JP 12638879 A JP12638879 A JP 12638879A JP S5650311 A JPS5650311 A JP S5650311A
Authority
JP
Japan
Prior art keywords
lens
lenses
focal length
total
object side
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
JP12638879A
Other languages
Japanese (ja)
Other versions
JPH0115841B2 (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 JP12638879A priority Critical patent/JPS5650311A/en
Publication of JPS5650311A publication Critical patent/JPS5650311A/en
Publication of JPH0115841B2 publication Critical patent/JPH0115841B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Lenses (AREA)

Abstract

PURPOSE: To simplify the constitution of the wide-angle zoom lens system, by causing the lens group consisting of total 8 lenses to satisfy prescribed conditions.
CONSTITUTION: In order from the object side, the front part is constituted by positive lens L1, negative lenses L2 and L3 with strong concave faces in the image side, and positive meniscus lens L4 with the convex face in the object side, and the back part is constituted by lens L5 with biconvex faces, positive meniscus lens L6 with the strong convex face in the object side, negative lens L7 with biconcave faces, and positive lens L8. When the synthetic focal length in the short focus side of the whole of the zoom system, the focal length of the front part, the focal length of the back part, the total of lens thickness and air gap of the front part, the total of those of the back part, respective single substance focal length of lenses L1WL8 from the object side, the synthetic focal length of lenses L5 and L4, the total of lens thickness and air gap of lenses L5WL7, the thickness of lens L8, and the refractive index of glass materials of lens L8 on line (d) are denoted as fW, fFC, fRC, ΣdFC, ΣdRC, f1Wf8, f5.6, d9W12, d15, and n8 respexitively, conditions of expressions IWVIII are satisfied.
COPYRIGHT: (C)1981,JPO&Japio
JP12638879A 1979-10-02 1979-10-02 Wide-angle zoom lens system Granted JPS5650311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12638879A JPS5650311A (en) 1979-10-02 1979-10-02 Wide-angle zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12638879A JPS5650311A (en) 1979-10-02 1979-10-02 Wide-angle zoom lens system

Publications (2)

Publication Number Publication Date
JPS5650311A true JPS5650311A (en) 1981-05-07
JPH0115841B2 JPH0115841B2 (en) 1989-03-20

Family

ID=14933898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12638879A Granted JPS5650311A (en) 1979-10-02 1979-10-02 Wide-angle zoom lens system

Country Status (1)

Country Link
JP (1) JPS5650311A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832843U (en) * 1981-08-27 1983-03-03 久留米　忠彦 handrail equipment
JPS6055311A (en) * 1983-09-06 1985-03-30 Asahi Optical Co Ltd Zoom lens
JPS61114217A (en) * 1984-11-09 1986-05-31 Canon Inc Photographic optical system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5254456A (en) * 1975-10-29 1977-05-02 Nippon Chemical Ind Wide angle zoom lens syste
JPS53135658A (en) * 1977-04-30 1978-11-27 Asahi Optical Co Ltd Zoom lens including ultraawide lens
JPS53140047A (en) * 1977-05-13 1978-12-06 Asahi Optical Co Ltd Big zoom ratio lens including wide angle lens
JPS5415733A (en) * 1977-06-10 1979-02-05 Asahi Optical Co Ltd Lowwmagnification variableeangleelens system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5254456A (en) * 1975-10-29 1977-05-02 Nippon Chemical Ind Wide angle zoom lens syste
JPS53135658A (en) * 1977-04-30 1978-11-27 Asahi Optical Co Ltd Zoom lens including ultraawide lens
JPS53140047A (en) * 1977-05-13 1978-12-06 Asahi Optical Co Ltd Big zoom ratio lens including wide angle lens
JPS5415733A (en) * 1977-06-10 1979-02-05 Asahi Optical Co Ltd Lowwmagnification variableeangleelens system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832843U (en) * 1981-08-27 1983-03-03 久留米　忠彦 handrail equipment
JPS6055311A (en) * 1983-09-06 1985-03-30 Asahi Optical Co Ltd Zoom lens
JPS61114217A (en) * 1984-11-09 1986-05-31 Canon Inc Photographic optical system

Also Published As

Publication number Publication date
JPH0115841B2 (en) 1989-03-20

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