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Browse Prior Art Database

Data Entry Device Using Optical Fibers

IP.com Disclosure Number: IPCOM000091790D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Gaffney, JF: AUTHOR

Abstract

Optical fiber group 10 is arranged in a single row near the bottom edge of data display cathode ray tube 11. Opaque mask 12 on the face of tube 11 prevents light from entering the fibers 10 until they are deflected. Guides, not shown, are provided to assure accurate horizontal alignment of each fiber 10 in both the upper and deflected positions. When fibers 10 are deflected below the level of mask 12, light pulses from each vertical scan of raster 13 pass through the deflected fibers 10 to photoelectric transducer 14 at their fixed ends. The number of pulses generated during one frame is a function of the spacing between scanning lines and the diameter of fibers 10. The latter are selectively deflected by finger pressure applied to attached keys, not shown, or other mechanical or electromechanical devices.

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Data Entry Device Using Optical Fibers

Optical fiber group 10 is arranged in a single row near the bottom edge of data display cathode ray tube 11. Opaque mask 12 on the face of tube 11 prevents light from entering the fibers 10 until they are deflected. Guides, not shown, are provided to assure accurate horizontal alignment of each fiber 10 in both the upper and deflected positions. When fibers 10 are deflected below the level of mask 12, light pulses from each vertical scan of raster 13 pass through the deflected fibers 10 to photoelectric transducer 14 at their fixed ends. The number of pulses generated during one frame is a function of the spacing between scanning lines and the diameter of fibers 10. The latter are selectively deflected by finger pressure applied to attached keys, not shown, or other mechanical or electromechanical devices. When deflected, fibers 10 are held by electromagnet 15 which attracts the soft iron bar 16 carried by the fiber 10. For that purpose, the electromagnet 15 is continuously energized from source 17 connected through a normally closed switch 18. This is opened on signal from pulse retimer 28 after the selected character is transmitted and decoded.

For purposes of providing a data input to a central processor, each fiber 10 represents a specific data character. The character code corresponds to the order of fibers 10 in the row along the face of tube 11. Character identification is obtained using the timing of the vertical scans of raster 13 of tube 11. For this purpose, binary counter 19 is driven in synchronism with the raster of tube 11. Video generator 20, which can be part of a central processor, is connected through communication link 21 to the video and beam deflection circuits of tube
11. Synchronizing source 22, whi...