JPS54116919A - Lens system of front lens delivery type - Google Patents

Lens system of front lens delivery type

Info

Publication number
JPS54116919A
JPS54116919A JP2382578A JP2382578A JPS54116919A JP S54116919 A JPS54116919 A JP S54116919A JP 2382578 A JP2382578 A JP 2382578A JP 2382578 A JP2382578 A JP 2382578A JP S54116919 A JPS54116919 A JP S54116919A
Authority
JP
Japan
Prior art keywords
group
stands
aberration
distance
lens
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
JP2382578A
Other languages
Japanese (ja)
Other versions
JPS6155085B2 (en
Inventor
Keiji Ikemori
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 JP2382578A priority Critical patent/JPS54116919A/en
Publication of JPS54116919A publication Critical patent/JPS54116919A/en
Publication of JPS6155085B2 publication Critical patent/JPS6155085B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To produce a highly efficient and compact lens system by making possible the range finding operation from infinity to a close range with a remarkably small delivery and by reducing the fluctuation in aberration when the distance to an object is varied.
CONSTITUTION: There are arranged from the side of an object a first group, a second group, a slit and a fourth group. The focusing operation is carried out by moving the first group in the direction of an optical axis. The first group is composed of a negative meniscus lens having its convex side facing the object, and a positive lens having its convex side facing the object. The second group is composed of two concave lenses, whereas the third group is composed of two concave lenses and two convex lenses. By satisfying the conditions expressed by Equations (1) to (4), the aberration generated by the first group can be reduced. By satisfying the conditions expressed by Equations (5) to (8), moreover, the fluctuations in the aberration due to the variation in the distance to the object can be eliminated, and at the same time the aberration of a reference distance to the object can be satisfactorily compensated. Here, ν stands for Abbe's number; N stands for a refractive index; R stands for radius of curvature; and f stands for a focal length.
COPYRIGHT: (C)1979,JPO&Japio
JP2382578A 1978-03-02 1978-03-02 Lens system of front lens delivery type Granted JPS54116919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2382578A JPS54116919A (en) 1978-03-02 1978-03-02 Lens system of front lens delivery type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2382578A JPS54116919A (en) 1978-03-02 1978-03-02 Lens system of front lens delivery type

Publications (2)

Publication Number Publication Date
JPS54116919A true JPS54116919A (en) 1979-09-11
JPS6155085B2 JPS6155085B2 (en) 1986-11-26

Family

ID=12121130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2382578A Granted JPS54116919A (en) 1978-03-02 1978-03-02 Lens system of front lens delivery type

Country Status (1)

Country Link
JP (1) JPS54116919A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2825657B2 (en) * 1992-03-30 1998-11-18 ポラロイド コーポレーシヨン Compact objective lens with two lens groups

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2825657B2 (en) * 1992-03-30 1998-11-18 ポラロイド コーポレーシヨン Compact objective lens with two lens groups

Also Published As

Publication number Publication date
JPS6155085B2 (en) 1986-11-26

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