| 摘要 |
<p>A fixed spool reel for a fishing line is disclosed that incorporates an apparatus (50, 54) for estimating the length of line unwound from the spool. The apparatus comprises a narrow detection light path defined by a light source (60) and a light sensor (64) mounted on the spool (10), the light path extending over the axial length of the spool and being interrupted by the fishing line as each turn of the line is unwound from the spool. A signal processing circuit (70) is connected to the light sensor (64) to detect and count interruptions of the detection light path. In the invention, a collimator (80, 82, 84) is provided to restrict the angular sensitivity of the sensor (64) to light that has travelled along the associated detection light path.</p> |
