| 摘要 |
<p>PURPOSE:To prevent the misjudgement in the tape terminal detecting circuit by providing a 1st detection circuit detecting the existence of the photodetection of a light receiving element at the time of light emitting of a light emitting element and a 2nd detection circuit detecting the existence of the photodetection of the light receiving element at the time of no light emitting of the light emitting element. CONSTITUTION:A light emitting element 2 is flashed by a light emitting element driving circuit 1 and when the light emitting element is lit, whether the light receiving element 3 is photodetecting or not is studied by the 1st detection circuit and if not photodetecting, it is judged not the tape terminal by a tape terminal detecting circuit 5. In case of photodetecting, then, whether the light receiving element is photodetecting or not is studied, when the light emitting element is not lit by the 2nd detection circuit 6, and only when not photodetecting the light, the tape terminal detection circuit 4 judges as the tape terminal. In this way, the judgement of the tape terminal detection circuit as the tape terminal by mistake can be prevented.</p> |
