Vibrating fiber optic display having a resonant ribbon driver

Details Vibrating fiber optic display having a resonant ribbon driver Vibrating fiber optic display having a resonant ribbon driver

1988-01-05

1989-05-16

Caldwell Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

34081531, 340706, 310321, G06F 314

Patent

active

048313700

ABSTRACT:
A vibrating fiber optic display unit is provided for use as an aircraft pilot display unit and for overcoming the problem of manually adjusting the display unit due to temperature changes. The display unit has a fiber optic ribbon having a plurality of fibers which form a display pattern at the free ends of the fibers during vibration of the fiber optic ribbon. The ribbon has light emitting diodes for the fibers. A microprocessor provides signals to the diodes for forming light dots in the display pattern. A piezo film transducer is mounted on the ribbon. Drive means vibrates the ribbon. An optocoupler has a shutter portion mounted on the ribbon. A ribbon oscillator network receives signals from the optocoupler and from the piezo film transducer and provides signal to the drive means, whereby the ribbon is vibrated at its natural frequency, and whereby the drive means automatically adjusts to changes in the ribbon natural frequency due to temperature change.

REFERENCES:
patent: 3846784 (1974-11-01), Sinclair
patent: 4311999 (1982-01-01), Upton et al.
patent: 4600855 (1986-07-01), Strachan
Fisher et al., "Vibrating Display Unit" IBM Technical Disclosure Bulletin, vol. 22, No. 1, Jun. 1979, pp. 6-8.
Wooton, "Phase-Locked-Loop Control of a Tuning Fork Oscillator", IBM Technical Disclosure Bulletin, vol. 22, No. 3, Aug. 1979, pp. 1088-1090.

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