JPS6424214A - Variable power optical system - Google Patents

Variable power optical system

Info

Publication number
JPS6424214A
JPS6424214A JP18080087A JP18080087A JPS6424214A JP S6424214 A JPS6424214 A JP S6424214A JP 18080087 A JP18080087 A JP 18080087A JP 18080087 A JP18080087 A JP 18080087A JP S6424214 A JPS6424214 A JP S6424214A
Authority
JP
Japan
Prior art keywords
group
lens
variable
power
refracting power
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.)
Pending
Application number
JP18080087A
Other languages
Japanese (ja)
Inventor
Yasuhisa Sato
Hiroshi Matsui
Hiroki Nakayama
Koji Oizumi
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP18080087A priority Critical patent/JPS6424214A/en
Publication of JPS6424214A publication Critical patent/JPS6424214A/en
Pending legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE:To reduce the moving quantity of a lens group according to variable power and to miniaturize the whole of a lens system, by providing refracting power variable lens in a first group, and specifying respective lens group. CONSTITUTION:The first group 1 is provided with the refracting power variable lens, and the refracting power of the refracting power variable lens is changed at the time of performing the variable power, and also, conditions phi1/phiw>=-(1/z<1/2>+0.1) and -0.3<=DELTAphi1/phiw<=0 are satisfied assuming the refracting power at the wide angle end of a whole system as phiw, and the refracting powers at the wide angle end and the telescopic end of the first group 1 as phi1 and phi1+DELTAphi1, and a variable power ratio as (z). Also, by fixing the first group 1 and moving a second group 2 to an object side linearly, the variable power from the wide angle end to the telescopic end is performed. In such a way, it is possible to reduce the entire length of a lens efficiently.
JP18080087A 1987-07-20 1987-07-20 Variable power optical system Pending JPS6424214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18080087A JPS6424214A (en) 1987-07-20 1987-07-20 Variable power optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18080087A JPS6424214A (en) 1987-07-20 1987-07-20 Variable power optical system

Publications (1)

Publication Number Publication Date
JPS6424214A true JPS6424214A (en) 1989-01-26

Family

ID=16089562

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18080087A Pending JPS6424214A (en) 1987-07-20 1987-07-20 Variable power optical system

Country Status (1)

Country Link
JP (1) JPS6424214A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007078799A (en) * 2005-09-12 2007-03-29 Olympus Imaging Corp Variable power optical system and imaging apparatus using the same
WO2017146021A1 (en) * 2016-02-23 2017-08-31 Hoya株式会社 Variable power optical system for endoscopes, endoscope, and endoscope system
CN110328445A (en) * 2019-07-12 2019-10-15 卡门哈斯激光科技（苏州）有限公司 A kind of near-infrared monochromatie objective

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007078799A (en) * 2005-09-12 2007-03-29 Olympus Imaging Corp Variable power optical system and imaging apparatus using the same
WO2017146021A1 (en) * 2016-02-23 2017-08-31 Hoya株式会社 Variable power optical system for endoscopes, endoscope, and endoscope system
WO2017145265A1 (en) * 2016-02-23 2017-08-31 Hoya株式会社 Variable magnification optical system for endoscope and endscope
JPWO2017146021A1 (en) * 2016-02-23 2018-12-13 Hoya株式会社 Magnification optical system for endoscope, endoscope and endoscope system
US10898061B2 (en) 2016-02-23 2021-01-26 Hoya Corporation Endoscope magnification optical system, endoscope, and endoscope system
DE112017000944B4 (en) * 2016-02-23 2021-02-18 Hoya Corporation Endoscope magnifying optics, endoscope and an endoscope system
CN110328445A (en) * 2019-07-12 2019-10-15 卡门哈斯激光科技（苏州）有限公司 A kind of near-infrared monochromatie objective
CN110328445B (en) * 2019-07-12 2020-12-22 卡门哈斯激光科技（苏州）有限公司 Near-infrared monochromatic objective lens

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