| 摘要 |
An electric type speed meter comprising a pulse generating means (1) arranged to generate a pulse signal corresponding to a vehicle speed, a control circuit (2) arranged to count the number of output pulses of the pulse generating means (1) at each time at regular time intervals and discriminate between positive and negative of a difference between a number value counted at the present time and a number value counted just before the present counting time and in addition generate pulses of the number corresponding to that difference, a pulse motor driving circuit (3) arranged to distribute in sequence the output pulses of the control circuit to plural poles of a pulse motor (4) so as to rotate the pulse motor in either a regular direction or the reverse direction, and an indicator (5) arranged to be rotated at its pointer by the pulse motor (4) for indicating a speed. |
