JPH01142518A - Double focus switching lens system - Google Patents

Double focus switching lens system

Info

Publication number
JPH01142518A
JPH01142518A JP30059687A JP30059687A JPH01142518A JP H01142518 A JPH01142518 A JP H01142518A JP 30059687 A JP30059687 A JP 30059687A JP 30059687 A JP30059687 A JP 30059687A JP H01142518 A JPH01142518 A JP H01142518A
Authority
JP
Japan
Prior art keywords
lens
temp
piece
change
fluctuation
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
JP30059687A
Other languages
Japanese (ja)
Inventor
Kazuo Kimura
Yoshinobu Kudo
Original Assignee
Minolta Camera 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 Minolta Camera Co Ltd filed Critical Minolta Camera Co Ltd
Priority to JP30059687A priority Critical patent/JPH01142518A/en
Publication of JPH01142518A publication Critical patent/JPH01142518A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To improve the fluctuation in lens back by a temp. change and to prevent an increase of cost by providing at least a piece of plastic lens having a positive refracting power as a main lens and providing at least a piece of plastic lens having a negative refracting power as a rear converter lens.
CONSTITUTION: The main lens I is so constituted as to have at least a piece of the plastic lens having the positive refracting power and the rear converter lens II is so constituted as to have at least a piece of the plastic lens having the negative refracting power. The quantity of the fluctuation in the lens back of the main lens by the temp. change and the quantity of extension of the body by the temp. change are canceled by the quantity of the fluctuation generated in the rear converter lens II. The increase in the cost of a camera is thereby not resulted even if the quantity of the fluctuation in the lens back by the temp. change is decreased.
COPYRIGHT: (C)1989,JPO&Japio
JP30059687A 1987-11-27 1987-11-27 Double focus switching lens system Pending JPH01142518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30059687A JPH01142518A (en) 1987-11-27 1987-11-27 Double focus switching lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30059687A JPH01142518A (en) 1987-11-27 1987-11-27 Double focus switching lens system

Publications (1)

Publication Number Publication Date
JPH01142518A true JPH01142518A (en) 1989-06-05

Family

ID=17886747

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30059687A Pending JPH01142518A (en) 1987-11-27 1987-11-27 Double focus switching lens system

Country Status (1)

Country Link
JP (1) JPH01142518A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013145547A1 (en) * 2012-03-26 2013-10-03 富士フイルム株式会社 Imaging lens and imaging device provided with imaging lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013145547A1 (en) * 2012-03-26 2013-10-03 富士フイルム株式会社 Imaging lens and imaging device provided with imaging lens
US8749896B2 (en) 2012-03-26 2014-06-10 Fujifilm Corporation Imaging lens and imaging apparatus provided with the imaging lens
JPWO2013145547A1 (en) * 2012-03-26 2015-12-10 富士フイルム株式会社 Imaging lens and imaging device provided with imaging lens

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