| 摘要 |
PROBLEM TO BE SOLVED: To enhance a predetermined light distributing performance and strength of shock resistance and the like by satisfying specific relationships of a product shell shape, the inner diameter of a cylindrical opening, a product shell dimension, a product height, a thickness and the like in a preliminary mold which is molded by injection. SOLUTION: A resin globe 2 having a product shell dimension greater than an inner diameter of a cylindrical opening and being formed into an undercut shape is disposed via a screw at a female screw of a luminaire body 1 having a florescent lamp 3 fixed thereto. In the form in which the inner diameter of the cylindrical opening of a luminaire globe is 150mm or more, the product shell dimension is 1.1-1.5 times the inner diameter of the opening, and a product height of 0.2-0.7 times the inner diameter of the opening, a ratio of a thick portion to a thin portion in the globe is selected to be 1.4-3.0 times. Consequently, it is possible to provide a moisture and water-proofing type luminaire having a uniform light quantity in every orientation, rationality in view of rigidity and shock resistance, and a great design freedom of a reentrant type luminaire. |
