| 摘要 |
PURPOSE:To make known a straight mileage from a starting point toward a destination by charging a capacitor through a photoelectric element wherein current is changed by a speed of a running body and by an angle of the running direction to a specific axis (east-west). CONSTITUTION:A screening plate 31 is placed between a photoemitting element and a photoreceiving element 11(12) and is linked to a speed meter so that luminous energy proportional to the instantaneous speed ut of the running vehicle is obtained. Likewise, another screening substance 32 is given an angle proportional to the angle theta of the running body to the east-west direction through the intermediary of a magnet pointing to the north-south so that the luminous energy reaching the photoreceiving plate 11(12) changed in proportion to costhetat (sinthetat). Charging is made up to a voltage corresponding to an integral value of Vt costhetat with the output of the photoreceiving element 11 and, likewise, charging is made up to a voltage corresponding to an integral value of Vt sinthetat with the output of the photoreceiving element 12, and from an operational amplifier 15, the difference between the algebratic sum thereof and the voltage by a variable resistance 14, i.e. the difference between the distance from the starting point to the destination and the mileage between them is outputted. |
