JPS5650310A - Projection lens - Google Patents

Projection lens

Info

Publication number
JPS5650310A
JPS5650310A JP12638779A JP12638779A JPS5650310A JP S5650310 A JPS5650310 A JP S5650310A JP 12638779 A JP12638779 A JP 12638779A JP 12638779 A JP12638779 A JP 12638779A JP S5650310 A JPS5650310 A JP S5650310A
Authority
JP
Japan
Prior art keywords
lens
object side
convex face
positive meniscus
face faced
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
JP12638779A
Other languages
Japanese (ja)
Inventor
Masamichi Kitagawa
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 JP12638779A priority Critical patent/JPS5650310A/en
Publication of JPS5650310A publication Critical patent/JPS5650310A/en
Pending legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE: To obtain a light-weight, cheap, and high-contrast projection lens, by constituting the lens system consisting of 5 groups and 5 lenses so that prescribed conditions may be satisfied.
CONSTITUTION: The projection lens has 5-group and 5-lens constitution of the first positive meniscus or flat convex lens L1 with the convex face faced to the object side, the second positive meniscus lens L2 with the convex face faced to the object side, the third negative lens L3 with biconcave faces, the fourth positive lens L4 with the strong convex face faced to the image side and biconvex faces, and the fifth positive meniscus lens L5 with the convex face faced to the object side arranged in order from the object side. When the synthetic focal length of the whole of the system, refractive force of the third lens L3, and the curvature radius of the lens face of the n-th lens from the object side are denoted as (f), K3 and rn respectively, conditions of expression IWIII are satisfied.
COPYRIGHT: (C)1981,JPO&Japio
JP12638779A 1979-10-02 1979-10-02 Projection lens Pending JPS5650310A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12638779A JPS5650310A (en) 1979-10-02 1979-10-02 Projection lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12638779A JPS5650310A (en) 1979-10-02 1979-10-02 Projection lens

Publications (1)

Publication Number Publication Date
JPS5650310A true JPS5650310A (en) 1981-05-07

Family

ID=14933876

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12638779A Pending JPS5650310A (en) 1979-10-02 1979-10-02 Projection lens

Country Status (1)

Country Link
JP (1) JPS5650310A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114296219A (en) * 2021-12-29 2022-04-08 歌尔股份有限公司 Projection lens and projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114296219A (en) * 2021-12-29 2022-04-08 歌尔股份有限公司 Projection lens and projector
CN114296219B (en) * 2021-12-29 2023-09-12 歌尔光学科技有限公司 Projection lens and projector

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