| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact small-sized electronic measure which is suitable for use in general homes and offices. SOLUTION: A portable small-sized electronic measure uses a light-wave phase difference system using laser light as an electronic range finding means EMD. The means EMD is housed in a case main body having a detecting window and provided with a display panel composed of switches (S1)-(S4) operated from the outside and a liquid panel 3 on one side so as to display ranged-found results, etc. In addition, the means EMD can be switched so as to use the front or rear end face of the case main body as a range finding reference by operating the switches (S1)-(S4) from the outside and, at the same time, the range- finding range of the means EMD is made switchable in accordance with the range-finding object or purpose. In order to minimize the power consumption of a battery power source to the necessary minimum, the driving condition of the laser light source 4 of the means EMD is changed in accordance with the switched range-finding range.
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