JPS5458453A - Light attenuator - Google Patents

Light attenuator

Info

Publication number
JPS5458453A
JPS5458453A JP12468177A JP12468177A JPS5458453A JP S5458453 A JPS5458453 A JP S5458453A JP 12468177 A JP12468177 A JP 12468177A JP 12468177 A JP12468177 A JP 12468177A JP S5458453 A JPS5458453 A JP S5458453A
Authority
JP
Japan
Prior art keywords
light
evaporated
glass plate
optical lens
attenuator
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
JP12468177A
Other languages
Japanese (ja)
Inventor
Fumio Mita
Shoichi Kurita
Keiji Tanaka
Seiji Terai
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12468177A priority Critical patent/JPS5458453A/en
Publication of JPS5458453A publication Critical patent/JPS5458453A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To achieve the improvement in the quality of the attenuator by letting transmitted light be absorbed by the utilization of the reflected light of the metal plate evaporated on a glass plate thereby preventing the entry of reverse light to the incident side.
CONSTITUTION: A glass plate 1 evaporated with a metal film 2 as a reflection type light attenuation plate is disposed on the front surface of the optical lens 4 coupled to an optical transmission line 3 and a light absorber 5 is provided therebehind. The light P1 incident from the optical fiber 3 end becomes parallel beams through an optical lens 4 and the beams fall onto the metal film 2 evaporated on the glass plate 1. Part of the light reflects and is again focused by the optical lens 4 and enters the optical fiber 3 end as light P3. Since the attenuator is formed by making use of the reflected light in this way and the transmitted light is also absorbed in the absorber 5, no inconveniences will occur
COPYRIGHT: (C)1979,JPO&Japio
JP12468177A 1977-10-18 1977-10-18 Light attenuator Pending JPS5458453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12468177A JPS5458453A (en) 1977-10-18 1977-10-18 Light attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12468177A JPS5458453A (en) 1977-10-18 1977-10-18 Light attenuator

Publications (1)

Publication Number Publication Date
JPS5458453A true JPS5458453A (en) 1979-05-11

Family

ID=14891429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12468177A Pending JPS5458453A (en) 1977-10-18 1977-10-18 Light attenuator

Country Status (1)

Country Link
JP (1) JPS5458453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5745634A (en) * 1996-07-24 1998-04-28 Jds Fitel Inc. Voltage controlled attenuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5745634A (en) * 1996-07-24 1998-04-28 Jds Fitel Inc. Voltage controlled attenuator

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