LIGHT EMITTING DEVICE AND PHOTODETECTOR

摘要

PURPOSE:To obtain a light emitting device which is simple in structure and excellent in watertightness and airtightness by finishing a front position of a light emitting element on a surface of an optical window in a smooth surface and finishing its periphery in a rough surface. CONSTITUTION:An optical window 2 is fixed closely to an entire opening of a vessel 1, while a light emitting element 3 such as a light emitting diode is housed. The light emitting element 3 is mounted on a substrate 4, while a drive circuit 5 for driving the light emitting element 3 is also mounted on the substrate 4. Power is supplied from outside via a lead 6 to the drive circuit 5. A front position of the light emitting element 3 of the optical window is finished in a smooth surface and both faces in the periphery are finished in rough surfaces. Such rough finishing is realized by leather finish molding at the time of molding the optical window 2. This is formed by making a metal mold for molding rough. Thus a light emitting device which is simple in structure and excellent in watertightness and airtightness can be obtained.