PURPOSE: To prevent separation of an adhesive agent and thereby to improve sealing capability by a method wherein a protuberance is formed of the adhesive agent along the junction between a package upper cover and an ultraviolet light transmitting lid.
CONSTITUTION: An ultraviolet light transmitting lid 2 is fitted to a step 10 formed along a window 8 provided in an upper cover 1' formed out of thermoplastic resin sheet. An adhesive agent is applied to the junction between the step 10 and the lid 2 with the adhesive agent building a protuberance not lower than 100μm. The protuberance moderates the shear attributable to the difference in the rate of thermal expansion between the upper cover 1', the lid 2 and the adhesive agent. This keeps the adhesive agent from separation, which contributes to the realization of a package highly reliable in its sealing properties.
HAZAMA KEIJI
OOTA SHINICHI
KANAMARU KIICHI
