2011 年 19 巻 3 号 p. 51-60
Molded parts containing photoluminescent materials are expected to find numerous uses because they have high installation flexibility and long service life. However, as photoluminescent materials are very expellsive, it is necessary to develop molded parts that can maintain light emission for extended times with as small an amount of photoluminescent material as possible. An improved set of molding conditions was obtained from an earlier optimization experiment with control factors allocated oll an orthogonal L18 array. As the reproducibility of the gain was low, however, it was necessary to reexamine the functional definition and evaluation method. The experimental plan was therefore reconsidered with the aim of finding still better conditions. In the previous experiment the light emission function was evaluated. This time, the light storage function was also evaluated. As a result of the new experiment on the light emission function, reproducibility of the gain was obtained and better molding conditions were found. However, reproducibility was not obtained in the experiment on the light storage function, so it will be necessary to reexamine the evaluation method.