JPS5541415A - Semi-transparent mirror - Google Patents

Semi-transparent mirror

Info

Publication number
JPS5541415A
JPS5541415A JP11415478A JP11415478A JPS5541415A JP S5541415 A JPS5541415 A JP S5541415A JP 11415478 A JP11415478 A JP 11415478A JP 11415478 A JP11415478 A JP 11415478A JP S5541415 A JPS5541415 A JP S5541415A
Authority
JP
Japan
Prior art keywords
prism
refractive index
dielectric thin
thin film
semi
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
JP11415478A
Other languages
Japanese (ja)
Inventor
Kazuo Kimura
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.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP11415478A priority Critical patent/JPS5541415A/en
Publication of JPS5541415A publication Critical patent/JPS5541415A/en
Pending legal-status Critical Current

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  • Viewfinders (AREA)

Abstract

PURPOSE: To obtain the semi-transparent mirror which is reduced of absorption of rays by thin films and is constituted as a prism type beam splitter of good efficiency by evaporating Al thin film and the specific dielectric thin films in order to make reflected light more than transmitted light.
CONSTITUTION: A semi-transparent film 1 which is disposed with an inclination to the optical axis of incident rays is sandwiched by a prism A through which reflected light R passes and a prism B through which transmitted light T passes. Here, the filmIis constituted by a dielectric thin filmIof a refractive index H higher than the refractive index of the prism A, a dielectric thin filmIIof a refractive index L lower than the refractive index of the prism A, an Al thin film Al, a dielectric thin film III of a refractive index H and a dielectric thin film IV of a refractive index L from the prism A side and the thicknesses of the thin filmsIthru IV are made 0.27W0.4λ with respect to the reference wavelength A of indicent rays per layer.
COPYRIGHT: (C)1980,JPO&Japio
JP11415478A 1978-09-19 1978-09-19 Semi-transparent mirror Pending JPS5541415A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11415478A JPS5541415A (en) 1978-09-19 1978-09-19 Semi-transparent mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11415478A JPS5541415A (en) 1978-09-19 1978-09-19 Semi-transparent mirror

Publications (1)

Publication Number Publication Date
JPS5541415A true JPS5541415A (en) 1980-03-24

Family

ID=14630494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11415478A Pending JPS5541415A (en) 1978-09-19 1978-09-19 Semi-transparent mirror

Country Status (1)

Country Link
JP (1) JPS5541415A (en)

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