JPS57186728A - Lens for copying machine - Google Patents
Lens for copying machineInfo
- Publication number
- JPS57186728A JPS57186728A JP7247381A JP7247381A JPS57186728A JP S57186728 A JPS57186728 A JP S57186728A JP 7247381 A JP7247381 A JP 7247381A JP 7247381 A JP7247381 A JP 7247381A JP S57186728 A JPS57186728 A JP S57186728A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- copying machine
- main lens
- parameters
- varying
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
PURPOSE:To realize compact constitution by using a four-element symmetric cella type, adding an auxiliary lens for magnification variation while moving this main lens, and thus varying focal length without varying conjugate length. CONSTITUTION:A main lens A has -x copying magnification, 241.89 focal length, and effective No.10.0 while having parameters so that r1=-r8=84.620, r2=-r7=-200.304, r3=-r6=-109.121, and r4=-r5=116.330, d1=d7=19.08, d2= d6=5.23, d3=d5=4.56, and d4=5.71, n1=n4=1.6779 and n2=n3=1.57616, and nu1=nu4=55.4 and nu2=nu3=41.4. For magnification variation, an auxiliary lens B having parameters so that r9=-683.57 and r10=-624.49, d8=5.0 and d9=5.0, n5=1.5168, and nu5=64.1 is added to the main lens A.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7247381A JPS57186728A (en) | 1981-05-13 | 1981-05-13 | Lens for copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7247381A JPS57186728A (en) | 1981-05-13 | 1981-05-13 | Lens for copying machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57186728A true JPS57186728A (en) | 1982-11-17 |
Family
ID=13490316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7247381A Pending JPS57186728A (en) | 1981-05-13 | 1981-05-13 | Lens for copying machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57186728A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10371927B2 (en) | 2014-12-30 | 2019-08-06 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing device and electronic device |
US11262545B2 (en) | 2019-07-19 | 2022-03-01 | Largan Precision Co., Ltd. | Imaging lens assembly, image capturing unit and electronic device |
-
1981
- 1981-05-13 JP JP7247381A patent/JPS57186728A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10371927B2 (en) | 2014-12-30 | 2019-08-06 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing device and electronic device |
US11262542B2 (en) | 2014-12-30 | 2022-03-01 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing device and electronic device |
US11867884B2 (en) | 2014-12-30 | 2024-01-09 | Largan Precision Co., Ltd. | Photographing optical lens assembly, image capturing device and electronic device |
US11262545B2 (en) | 2019-07-19 | 2022-03-01 | Largan Precision Co., Ltd. | Imaging lens assembly, image capturing unit and electronic device |
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