| 摘要 |
PURPOSE:To decrease the number of parts and man-hours for assembly and to provide the titled plate having excellent moisture resistance by forming prescribed wavelength cut filters directly on the diffusion plate by a direct vacuum deposition method using a material having excellent moisture resistance. CONSTITUTION:The IR cut filter 2 and the UV cut filter 3 are formed directly on both faces of the diffusion plate by the vacuum deposition method using the material (ZrTiO2, etc.) having the excellent moisture resistance. A photodetecting element 4 is bonded to a package 5 by using an adhesive agent and is sealed by a silicone resin 6. The diffusion plate 1 is mounted thereon by the adhesive agent. Since the filters 2, 3 are formed by the vapor deposition in such a manner, the thickness of the filters 2, 3 is decreased and the smaller area of the diffusion plate is necessitated. The number of parts and the man- hours for assembly are thus decreased and the diffusion plate having the excellent moisture resistance is obtd.
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