| 摘要 |
<p>PCT No. PCT/DE80/00120 Sec. 371 Date Apr. 15, 1981 Sec. 102(e) Date Apr. 15, 1981 PCT Filed Aug. 14, 1980 PCT Pub. No. WO81/00586 PCT Pub. Date Mar. 5, 1981.A key-operated lock, which comprises a reading head with a Hall generator, whereby the key is provided with magnetically readable data locations each of which forms at least a dual code. Between the individual data locations, magnetically readable time pulse planes are located. The data locations are represented by coded segments of soft magnetic material or permanent magnets. The timing pulse planes are either represented by these coded segments or are identified by the Hall generator in that the inductance between successive data locations drops to a value close to zero without rendering necessary any coded segments. Furthermore, circuits are described for analyzing the signal voltages supplied by the Hall generator for receiving clear signals or blocking signals for the lock.</p> |
