JPS5237447A - Device for constructing an optical system for a wide-angle door viewer - Google Patents
Device for constructing an optical system for a wide-angle door viewerInfo
- Publication number
- JPS5237447A JPS5237447A JP11312775A JP11312775A JPS5237447A JP S5237447 A JPS5237447 A JP S5237447A JP 11312775 A JP11312775 A JP 11312775A JP 11312775 A JP11312775 A JP 11312775A JP S5237447 A JPS5237447 A JP S5237447A
- Authority
- JP
- Japan
- Prior art keywords
- constructing
- wide
- optical system
- door viewer
- angle door
- 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
Links
Landscapes
- Lenses (AREA)
Abstract
PURPOSE: To obtain a device for constructing an optical system for a wide-angle door viewer which is of simple construction and has a field of vision of about 180° by cementing a concave lens of smaller diameter to the center of the rear surface of a concave objective of relatively larger diameter and arranging a convex ocular having the same diameter as the former concave lens at a specific interval in the rear of the cemented lenses.
COPYRIGHT: (C)1977,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11312775A JPS5237447A (en) | 1975-09-20 | 1975-09-20 | Device for constructing an optical system for a wide-angle door viewer |
US05/724,137 US4082434A (en) | 1975-09-20 | 1976-09-17 | Wide-angle optical system for door viewer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11312775A JPS5237447A (en) | 1975-09-20 | 1975-09-20 | Device for constructing an optical system for a wide-angle door viewer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5237447A true JPS5237447A (en) | 1977-03-23 |
JPS5423262B2 JPS5423262B2 (en) | 1979-08-13 |
Family
ID=14604209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11312775A Granted JPS5237447A (en) | 1975-09-20 | 1975-09-20 | Device for constructing an optical system for a wide-angle door viewer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5237447A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5492515A (en) * | 1977-12-29 | 1979-07-21 | Kubota Ltd | Treating method for molten nickel alloy containing active metal |
JPS5692110U (en) * | 1979-12-14 | 1981-07-22 | ||
US5138487A (en) * | 1991-01-09 | 1992-08-11 | Seung H. Han | Door viewer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59156340U (en) * | 1983-04-06 | 1984-10-20 | 三菱電機株式会社 | Switch with latch mechanism |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2538077A (en) * | 1948-05-27 | 1951-01-16 | Blosse Jean Charles Joseph | Optical viewer |
JPS4734519U (en) * | 1971-05-17 | 1972-12-18 | ||
JPS5052738U (en) * | 1973-09-08 | 1975-05-21 |
-
1975
- 1975-09-20 JP JP11312775A patent/JPS5237447A/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2538077A (en) * | 1948-05-27 | 1951-01-16 | Blosse Jean Charles Joseph | Optical viewer |
JPS4734519U (en) * | 1971-05-17 | 1972-12-18 | ||
JPS5052738U (en) * | 1973-09-08 | 1975-05-21 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5492515A (en) * | 1977-12-29 | 1979-07-21 | Kubota Ltd | Treating method for molten nickel alloy containing active metal |
JPS5692110U (en) * | 1979-12-14 | 1981-07-22 | ||
US5138487A (en) * | 1991-01-09 | 1992-08-11 | Seung H. Han | Door viewer |
Also Published As
Publication number | Publication date |
---|---|
JPS5423262B2 (en) | 1979-08-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS52117126A (en) | Telephoto lens system | |
JPS55101908A (en) | Wide angle door scope | |
JPS5246813A (en) | Photographic optical system for observation for ophthalmofunduscopic c amera | |
JPS5397824A (en) | Camera lens of behind iris | |
JPS5430028A (en) | Wide-angle lens | |
JPS5237447A (en) | Device for constructing an optical system for a wide-angle door viewer | |
JPS5232323A (en) | Front iris large aperture ratio lens | |
JPS5260619A (en) | Finder optical system | |
JPS57168214A (en) | Albada finder | |
JPS5417042A (en) | Wide-angle zoom lens | |
JPS52130631A (en) | Photographic lens of large aperture and super wide angle | |
JPS5323645A (en) | Zoom lens capable of easy transfer for focal distance range | |
JPS5310446A (en) | Eye piece lens for microphotography | |
JPS53135657A (en) | Eye lens in eyepiece system | |
JPS51144229A (en) | Bright wide-angle lens with many surrounding quantities of light | |
JPS53122426A (en) | Projector | |
JPS52146620A (en) | Gauss type lens | |
JPS51128523A (en) | An optical system for the retinal camera | |
JPS52127327A (en) | Foucsing lens system | |
JPS5297750A (en) | Objective lens of medium power | |
JPS5248315A (en) | Wide-angle lens of retrofocus type | |
JPS535620A (en) | Zoom lens | |
JPS5248316A (en) | Wide-angle lens of retrofocus type | |
JPS5380227A (en) | Photographic attachment lens | |
JPS51141585A (en) | Process for producing a photosemiconductor unit |