Cover glass with outer frame, semiconductor light emitting device, and semiconductor light receiving device

Abstract

The present invention relates to a cover glass with an outer frame including: a flat glass having a first main surface and a second main surface that are opposite sides; and an outer frame bonded to the first main surface of the flat glass via a glass adhesive layer, in which the outer frame is made of a glass ceramic in which a filler is dispersed in a borosilicate glass, the borosilicate glass and the filler both contain aluminum oxide, the filler has a volume fraction of 40% to 65% in the glass ceramic, the aluminum oxide contained in the filler has a volume fraction of 10% to 65% in the glass ceramic, and an absolute value of a difference in average thermal expansion coefficient at 50° C. to 350° C. between the flat glass and the outer frame is 20×10−7/° C. or less.

Dependencies are inferred from the claim text.