JPS565518A - Optical correction type variable focal length lens system - Google Patents

Optical correction type variable focal length lens system

Info

Publication number
JPS565518A
JPS565518A JP8086879A JP8086879A JPS565518A JP S565518 A JPS565518 A JP S565518A JP 8086879 A JP8086879 A JP 8086879A JP 8086879 A JP8086879 A JP 8086879A JP S565518 A JPS565518 A JP S565518A
Authority
JP
Japan
Prior art keywords
lens
convex
lens group
focal length
positive
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
JP8086879A
Other languages
Japanese (ja)
Other versions
JPS5811606B2 (en
Inventor
Takayuki Ito
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP54080868A priority Critical patent/JPS5811606B2/en
Publication of JPS565518A publication Critical patent/JPS565518A/en
Publication of JPS5811606B2 publication Critical patent/JPS5811606B2/en
Expired legal-status Critical Current

Links

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  • Lenses (AREA)

Abstract

PURPOSE: To realize the variable focal length system for home video television cameras of optical correction system which enables variable power by extremely simple mechanism and permits making image plane position equal by letting respective constituting lenses and the specifications of the constituting lenses satisfy the specific conditions.
CONSTITUTION: This lens system consists of the 1st, the 2nd and the third lens group from the object side and is capable of changing focal length and making image plane position equal by moving only the 2nd lens group, with the rest being held stationary. From the object side and with respect to the concave and convex on the object side, the 1st lens group consists of a negative meniscus lens of a convex face and a positive lens of a convex lens of strong curvature, the 2nd lens group consists of one or two negative meniscus lenses of convex faces and a positive meniscus lens of a convex face and the 3rd lens group consists of a positive lens of a convex face of strong curvature and the cemented positive lens of the positive lens and negative meniscus lens of which the faces of extremely strong curvatures are made cemented faces. Conditions of (1)W(6) are satisfied.
COPYRIGHT: (C)1981,JPO&Japio
JP54080868A 1979-06-27 1979-06-27 Optically corrected variable focal length lens system Expired JPS5811606B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54080868A JPS5811606B2 (en) 1979-06-27 1979-06-27 Optically corrected variable focal length lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54080868A JPS5811606B2 (en) 1979-06-27 1979-06-27 Optically corrected variable focal length lens system

Publications (2)

Publication Number Publication Date
JPS565518A true JPS565518A (en) 1981-01-21
JPS5811606B2 JPS5811606B2 (en) 1983-03-03

Family

ID=13730315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54080868A Expired JPS5811606B2 (en) 1979-06-27 1979-06-27 Optically corrected variable focal length lens system

Country Status (1)

Country Link
JP (1) JPS5811606B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147612A (en) * 1981-03-07 1982-09-11 Nippon Kogaku Kk <Nikon> Zoom lens
JPS62187315A (en) * 1986-02-14 1987-08-15 Ricoh Co Ltd Extremely small-sized zoom lens
JPS6474519A (en) * 1987-09-16 1989-03-20 Minolta Camera Kk Zoom lens
JPH01102511A (en) * 1987-10-16 1989-04-20 Minolta Camera Co Ltd Two-focus lens
JPH01201614A (en) * 1988-02-08 1989-08-14 Olympus Optical Co Ltd Variable power lens
CN108604001A (en) * 2016-02-24 2018-09-28 松下知识产权经营株式会社 Zoom-lens system, the photographic device with zoom-lens system and the vehicle with photographic device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147612A (en) * 1981-03-07 1982-09-11 Nippon Kogaku Kk <Nikon> Zoom lens
JPS62187315A (en) * 1986-02-14 1987-08-15 Ricoh Co Ltd Extremely small-sized zoom lens
JPS6474519A (en) * 1987-09-16 1989-03-20 Minolta Camera Kk Zoom lens
JPH01102511A (en) * 1987-10-16 1989-04-20 Minolta Camera Co Ltd Two-focus lens
JPH01201614A (en) * 1988-02-08 1989-08-14 Olympus Optical Co Ltd Variable power lens
CN108604001A (en) * 2016-02-24 2018-09-28 松下知识产权经营株式会社 Zoom-lens system, the photographic device with zoom-lens system and the vehicle with photographic device
CN108604001B (en) * 2016-02-24 2020-12-15 松下知识产权经营株式会社 Zoom lens system, image pickup apparatus having zoom lens system, and vehicle having image pickup apparatus

Also Published As

Publication number Publication date
JPS5811606B2 (en) 1983-03-03

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