Mobility cane for the blind incorporating ultrasonic obstacle se

Details Mobility cane for the blind incorporating ultrasonic obstacle se Mobility cane for the blind incorporating ultrasonic obstacle se

1979-06-05

1981-07-21

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367910, 343 5BL, 135 76, 135DIG11, G01S 1588

Patent

active

042802040

ABSTRACT:
A conventional mobility cane for the blind incorporates a compact, dual-mode, ultrasonic obstacle detection sensor that includes a combination transmitting and receiving, capacitance type electrostatic transducer. The size of the protective zone associated with said sensor is infinitely variable. In one mode, the sensor warns of low lying objects that might contact the upper extremities of an ambulatory mobility cane user. In another mode, the user can determine the presence or absence of more remote objects. Means are provided for readily alternating between said object sensor modes.

REFERENCES:
patent: 2496639 (1950-02-01), Richardt, Jr. et al.
patent: 3321737 (1967-05-01), Russell
patent: 3546467 (1970-12-01), Benjamin, Jr. et al.
patent: 3984803 (1976-10-01), Hawk et al.
Kuhl, Acoustica, vol. 4, 1954, pp. 519-532.
Muggli, U.S. Pat. Application Ser. No. 3,371, filed Jan. 15, 1979.

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