| 摘要 |
PROBLEM TO BE SOLVED: To easily inform a user that a film unit with a lens has turned to a dangerous state, while being left standing under high temperature by providing a temperature warning part formed by applying a temperature indicating paint which has reversibility to discoloring, when it rises to a prescribed temperature and to return to original color, when temperature drops. SOLUTION: A temperature warning label 11 is stuck on a back cover 3 covering a main body unit 1 from a back side, at the back face center of it. Two circles and the characters of hazards and cautions are printed on the temperature warning label 11 by using the temperature indicating paint (thermo- paint). The temperature indicating paint incorporates a compound discolored, when it rises to the prescribed temperature as a pigment and has the reversibility to discolor accompanying the transition of the crystal form of a pigment compound, when the temperature rises and to return to the original color when the temperature drops. For instance, when the temperature of the film unit with a lens 1 rises to 45 deg.C, the inside of the circle of the 'caution' changes color from white to black, and further when it rises to 55 deg.C, the inside of the circle of the 'hazard' changes in color to black.
|
