抄録
Reliability of a precision optical unit is required especially in a high-temperature and high-humidity environment for in-vehicle uses. The optical unit has to be hermetically sealed to prevent optical elements from performance degradation. For the reliable design of hermetically sealing structure, it is important to quantify the amount of water that permeates rubber parts such as O-rings used for leak stoppers of enclosure joints. In this report, quantification method of permeating water is described with a deformation analysis considering super elasticity of the rubber and a diffusion analysis under the deformed condition of the rubber.
