| 摘要 |
PROBLEM TO BE SOLVED: To obtain a photodetector unit capable of assuring photometric accuracy and enhancing the degree of freedom in the selection of a filter to be disposed at the window frame of a photodetecting window by use of the flexible filter of soft material by providing the inner side of the filter with a transmissible plane plate for filter reinforcement. SOLUTION: A photodetecting chip 11 is disposed on a circuit board 12 and is covered by a resin encapsulated package 13. The photodetecting window 15 is formed at this resin encapsulated package 13 and a laminated plate formed by superposing and laminating, for example, the filter 16 for visual sensitivity correction and IF cut and the transmissible plane plate 17 for filter reinforcement on each other is stuck to this window frame 15a. A filter of a flexible and soft flexible type is used for the filter 16. Plates which are made of materials harder than the material of the filter 16, glass, or rigid plastics, etc., and have the hardness to withstand the pressing force of the resin in packing the resin and to withstand the pressure deformation by the expansion and shrinkage of the resin 19 during thermal curing are used for the transmissible plane plate 17.
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