| 摘要 |
<p>In a retractable cable assembly, e.g. for an earphone (5), a flexible circuit board (FCB) element (18), preferably having a coiled portion (20), is used to provide a fixed, good quality, electrical connetion between a retractable cable (4) and circuitry (16) that may be mounted on a land portion (17) of the FCB (18). The circuitry (16) may include a socket (6) for connection to the input/output of a device with which the earphone (5) is to be used, e.g. a mobile phone, portable computing device or personal sound system. The cable (4) may be wound about a take-up reel (8), and the FCB coil (20) may be wound in the opposite direction within the reel (8), so that as the cable (4) is extended or retracted, the FCB coil (20) expands or contracts. The reel (8) may be biased to retract the cable (4) by a spring (9). A microswitch (15) may signal when the cable (4) is extended. The FCB element (18) may be made from a flat sheet, the coil (20) being formed from a flat spiral element that is cut about the central land portion (17).</p> |
