| 摘要 |
<p>PURPOSE:To eliminate the mutual interference between adjacent photo couplers and thus prevent crosstalk by photo-coupling the first and second light emitting and receiving elements via the first and second wavelengths which are different respectively. CONSTITUTION:The operating wavelengths (coupling wavelengths) of the first and second photo couplers are made different. For example, the first light emitting element 2a constituting the first photo coupler is composed of a GaP single crystal which emits a green light of a light emission center wavelength of 565nm, the first light receiving element 3a is composed of an amorphous Si (a- Si:H) of the peak of light receiving 580nm, and an LED consisting of a GaP single crystal of a light emission center wavelength 700nm is used as the second light emitting element 2c of the second photo coupler. As the second light receiving element 3c, an amorphous Si germanium (a-SixGe1-x:H) of the peak of light receiving of 680nm is selected.</p> |
