| 摘要 |
<p>A transmitter (10) projects light in accordance with a specific light projecting pattern, selected by a pattern selecting portion (11), of three light projecting patterns A through C having mutually differing projected light periods and projected light pulse widths. A pulse width evaluating circuit (30) of a detector (20) detects, as a difference in pulse width of a detected light signal, the difference in the projected light pulse width of the light projecting pattern, based on the same light projecting pattern pulse width information as the transmitter (10), selected by a pattern selecting portion (21), to identify locally-emitted light versus interference light.</p> |
