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 viewer

Info

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
Application number
JP11312775A
Other languages
Japanese (ja)
Other versions
JPS5423262B2 (en
Inventor
Tadaaki Hayashi
Akito Nakahara
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.)
KAAPU KK
Original Assignee
KAAPU KK
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 KAAPU KK filed Critical KAAPU KK
Priority to JP11312775A priority Critical patent/JPS5237447A/en
Priority to US05/724,137 priority patent/US4082434A/en
Publication of JPS5237447A publication Critical patent/JPS5237447A/en
Publication of JPS5423262B2 publication Critical patent/JPS5423262B2/ja
Granted legal-status Critical Current

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
JP11312775A 1975-09-20 1975-09-20 Device for constructing an optical system for a wide-angle door viewer Granted JPS5237447A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

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