Trigger circuit

Details Trigger circuit Trigger circuit

1975-12-11

1977-01-11

Duggan, Donovan F.

Electricity: motive power systems

Nonmagnetic motor

Thermoelectric motor

310 4A, 75170, 751227, H02N 700

Patent

active

040029549

ABSTRACT:
A wire of Nitinol can be stretched up to a given amount and will remain in this stretched state until heated to a critical temperature. When heated to the critical temperature, the wire restores to its original length. When the wire restores to its original length, it exhibits a substantial tensile force and this force can be used to operate a device such as a photographic shutter operatively attached to the wire, for example. The trigger circuit of this invention provides a current pulse for the required time period to heat the Nitinol wire to its critical temperature to thereby restore the wire to its original length. The circuit includes a high power transistor which is gated on for a controlled time to provide the required power to heat the Nitinol wire to its critical temperature.

REFERENCES:
patent: 2926293 (1960-02-01), Camm et al.
patent: 3174851 (1965-03-01), Buehler et al.
patent: 3389314 (1968-06-01), Lewis
patent: 3423608 (1969-01-01), Kerwin et al.
patent: 3754151 (1973-08-01), Clark
patent: 3802930 (1974-04-01), Brook et al.
patent: 3883885 (1975-05-01), Orlando
55-Nitinol-The Alloy with a Memory: its Physical Metallurgy, Properties and pplications, Jackson et al., NASA, 1972.

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