Browse Prior Art Database

Fiber Optic Shutter

IP.com Disclosure Number: IPCOM000090000D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Leighton, HN: AUTHOR

Abstract

The arrangement provides a gatable light path which uses a fiber optic shutter, drawing 1. Flexible member 1 consists of an optic fiber several thousandths of an inch in diameter enclosed in a thin-walled, magnetizable, resilient material. Fixed member 2 need not be flexible, but also consists of an optic fiber enclosed in a magnetic material. When members 1 and 2 are placed in a magnetic field, they become magnetized such that the unsupported end of member 1 is deflected and attracted to member 2. Stop 3 on member 2 serves to align the two members 1 and 2 to permit the axial transmission of light through such members. When the magnetic field is removed, member 1 is elastically restored to its undeflected position, shown at 1, from its deflected position as in broken line 4.

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Fiber Optic Shutter

The arrangement provides a gatable light path which uses a fiber optic shutter, drawing 1. Flexible member 1 consists of an optic fiber several thousandths of an inch in diameter enclosed in a thin-walled, magnetizable, resilient material. Fixed member 2 need not be flexible, but also consists of an optic fiber enclosed in a magnetic material. When members 1 and 2 are placed in a magnetic field, they become magnetized such that the unsupported end of member 1 is deflected and attracted to member 2. Stop 3 on member 2 serves to align the two members 1 and 2 to permit the axial transmission of light through such members. When the magnetic field is removed, member 1 is elastically restored to its undeflected position, shown at 1, from its deflected position as in broken line 4. The undeflected position of member 1 is selected to prevent dispersed light from passing from the free end of member 1 to the fiber in member 2. All optical interfaces are polished to enhance light transmission. Light is incident on member 1 from either a light source 5 as shown, or other source, and is projected via member 2 where desired.

Member 1 can be deflected directly by mechanical force, indirectly by moving a magnet to a nearby position, or remotely by a controlled electromagnetic field. If deflection is to be controlled remotely, the shutter assembly is placed inside a prewound, reed relay coil, or a coil 6 can be wound directly around glass envelope 7, as in dra...