JPS543558A - Light shielding and protecting device - Google Patents

Light shielding and protecting device

Info

Publication number
JPS543558A
JPS543558A JP6863677A JP6863677A JPS543558A JP S543558 A JPS543558 A JP S543558A JP 6863677 A JP6863677 A JP 6863677A JP 6863677 A JP6863677 A JP 6863677A JP S543558 A JPS543558 A JP S543558A
Authority
JP
Japan
Prior art keywords
light shielding
protecting device
dark state
state
light
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
JP6863677A
Other languages
Japanese (ja)
Inventor
Yukitoshi Okubo
Yukio Kasugayama
Yoji Matsufuji
Naoki Ayada
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 JP6863677A priority Critical patent/JPS543558A/en
Publication of JPS543558A publication Critical patent/JPS543558A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Non-Electrical Variables (AREA)

Abstract

PURPOSE: To perfectly eliminate detrimental light at the light shielding (dark state) by using a filter which cuts off short wavelength rays as well as to additionally improve quenching ratio by darkening the dark state without decreasing the rtansmittance of bright state.
COPYRIGHT: (C)1979,JPO&Japio
JP6863677A 1977-06-10 1977-06-10 Light shielding and protecting device Pending JPS543558A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6863677A JPS543558A (en) 1977-06-10 1977-06-10 Light shielding and protecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6863677A JPS543558A (en) 1977-06-10 1977-06-10 Light shielding and protecting device

Publications (1)

Publication Number Publication Date
JPS543558A true JPS543558A (en) 1979-01-11

Family

ID=13379410

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6863677A Pending JPS543558A (en) 1977-06-10 1977-06-10 Light shielding and protecting device

Country Status (1)

Country Link
JP (1) JPS543558A (en)

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