Patent ID: 6369380
Filing Date: 2002-04-09
Classification: G03B

Abstract:
A light receiver unit having a packaging cover and a light receiving element positioned in an inner space of said packaging cover, a resin being injected into said inner space to be solidified, said light receiver unit comprising:a window hole formed on said packaging cover; a filter fixed to said packaging cover to cover said window hole; and a transparent plane-parallel plate fixed to said packaging cover to cover said filter from the inside of said packaging cover, said transparent plane-parallel plate being harder than said filter, whereby said filter is protected from any pressure caused by said injected resin, said packing cover comprises: an outer smaller recessed portion formed on an inner surface of said packaging cover around said window hole; and an inner larger recessed portion formed on an inner surface of said packaging cover around said outer recessed portion, wherein a stepped portion is formed on an inner peripheral surface of said window hole, and wherein said filter and said transparent plane-parallel plate are fixed to said outer smaller recessed portion and said inner larger recessed portion, respectively.