| 摘要 |
<p>PURPOSE:To enhance the operational reliability by projecting lights individually from respective projecting sections, selecting a light receiving section having a highest output level and determining a corresponding projecting section thereby ensuring a sufficient quantity of emitted light depending on the detecting state. CONSTITUTION:When a narrow (wide) object 30a (30b) is detected, the object 30a corresponds to paths 1, 2, and the object 30b corresponds to paths 3, 4. Detection levels at light receiving sections 9, 13, 17, 21 are stored in a data memory 4 along with the projection path information for each projecting section. A CPU 1 actuates a main program 2 to start 24 the tuning and the light 3 projected along the path 1 is reflected on the surface of an object 30a and received along the path 2. The level of received light is subjected to A/D conversion 5 and stored. Similarly, the levels of lights received along the paths 2-4 are stored 3 and compared each other and then the highest level is selected. The corresponding projection path is then specified and the detection level is set For the path 1. Detection levels are similarly set for the paths 2-4 and the data is stored 4 upon finishing the setting.</p> |
