| 摘要 |
PURPOSE:To detect the total amount of reception of light from the amount of contraction of a light reception amount detecting element by providing the light reception amount detecting element made of light contracting resin on a light incident portion. CONSTITUTION:A light reception amount detecting element 2 comprises a detecting piece 21 made of light absorbing contracting resin and expandably enclosed in a soft light permeable wrapping bag 22 equipped with non-light contraction property and made of polyethylene resin, paper or the like and its end 23 stack and fixed on the inner face of the wrapping bag 22, and also a scale 25, a note 26 described from the end 23 to loose end 24. Light contracting resin is molded into a thin film from polyaminotelefutarete resin while the chained molecules of the resin are aligned in fixed direction. Radiation of ultraviolet rays and visible light causes the resin to be shortened as its chained molecules are shrinked. Measuring of the amount of contraction of the resin shows the total amount of reception of light. |
