Browse Prior Art Database

Fiber Optic Illuminated Switch

IP.com Disclosure Number: IPCOM000083755D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Uberbacher, EC: AUTHOR

Abstract

Fig. 1 shows a display console formed by a flexible viewable overlay and light-coupled switches. The switches have a fiber optic coupling to the overlay back surface (Figs. 2 and 3). Each coupling channel contains a coaxial fiber optic cable and a flexible foam restraint.

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Fiber Optic Illuminated Switch

Fig. 1 shows a display console formed by a flexible viewable overlay and light-coupled switches. The switches have a fiber optic coupling to the overlay back surface (Figs. 2 and 3). Each coupling channel contains a coaxial fiber optic cable and a flexible foam restraint.

Light from a not shown light source travels down the center fiber of the coaxial cable, strikes a reflective surface on the back side of the undeformed overlay, reflects into the outer fiber of the coaxial cable, and excites a not shown photodiode at the remote end of the outer fiber. When the overlay is deformed by manual pressure, as indicated in Fig. 3, light is prevented from reaching the outer fiber, thereby producing a corresponding electrical indication at the remote photodiode.

If the back surface of the panel is made partially transmissive, the light transmitted through the center fiber may be used as both a display indication and a switch controlling parameter.

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