| 摘要 |
<p>Locator means for assisting in locating an object (animate or inanimate) comprises a hand-held "searcher" (50) comprising a short-range signal transmitter powered by an internal cell or battery and having electronic circuitry for generating an address signal when activated by switching means (52) and a miniature "locator" (2) comprising a transponder powered by an internal cell or battery and having electronic circuitry and means for emitting a sound signal (10) and/or a light signal in response to its address signal received from the "searcher". The "searcher" (50) may be provided with circuitry and selective switching means (Fig. 7 or 5A) for selectively addressing, with coded signals, several locators which may be placed with or on respective objects or attached thereto, e.g. by means of a small ring (8). The "searcher" (50) is preferably torch-like with a handle (56) which may have a lug (58) for attachment of a lanyard (60) whereby the "searcher" may be tethered to a mounting (62). The transmitter-to-transponder signalling may be by airwaves or vibrations or by electromagnetic waves preferably employing pulse position modulation. Possible forms of such transmission are described, also information as to the electronic circuitry (Figs. 8 and 9) and constructional details of a miniature locator (16) (Figs. 3 and 4).</p> |
