| 摘要 |
PURPOSE:To prevent a light from being incident to a part except a photodetector by forming a shielding film on a region except a light passing route to the photodetector of the inner face of a package of a light transmitter, and setting the reflectivity of the inner face of the package to a predetermined value or less. CONSTITUTION:Other part than a slender rectangular region 7a extending longitudinally at the center of a glass cover 34 is so covered with a shielding film 7 in which the reflectivity of the inner face of a package is set to a predetermined value or less, and the region 7a is disposed directly above a photodetector 4 formed on a chip 2. Accordingly, an external light is passed only through the region 7a of the cover 34 with no film 7 into the package, and radiated only to the part of the photodetector 7 on the chip 2 sealed therein. Thus, the incident light is not radiated to an integrated circuit therearound. Since the film 7 is of black paint formed on the inner face of the cover 34, the reflectivity of the surface is substantially zero, and the incident light is not reflected in the package.
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