| 摘要 |
PURPOSE:To inform the amount of tape winding to a blind person, by converting a position signal in response to the photodetecting position of transmitted light from a tape window section into audible sense. CONSTITUTION:When a cassette 1 is loaded to a case 5 and the power supply is applied, a light from a light emitting element 6 is interrupted at the location where a tape 11 wound around the reel is projected to a transparent window 4, by photodetectors 7a, 7b, and the light of photodetectors 7a-7e is irradiated and a voltage is produced. The output of the photodetectors 7a, 7b is applied to AND circuits 13a-13e of a logical circuit 9. The output of oscillation circuits 14a-14e is applied to the AND circuits 13a-13e. The frequency of the oscillation circuits 14a-14d is selected in the same frequency emitted from a speaker 10. |
