| 摘要 |
PURPOSE:To make it possible to realize a seamless transparent body with uniform thickness and at the same time contrive to promote the efficiency of the condensation of horizontal light by a method wherein the nearly hemispherical head part of the transparent body and the cylindrical part of the transparent body connected to said head part are formed integrally so as to have uniform thickness and at the same time the length of said cylindrical part is set to the specified one. CONSTITUTION:Under the state that a disc-shaped transparent member is airtightly supported being applied by pressure on the I side and by negative pressure on the II side, firstly, heated air is applied at the center of said member as indicated with solid line arrows in order to form a hemispherical part 30a. Next, by applying heated air to the cylindrical peripheral part of said member as indicated with dotted line arrows, the head part, which is formed firstly, lowers itself by its dead weight. A straight cylindrical part 30b is formed by gradually shifting the position, at which heated air is applied, upwards in response to said lowering head part. The whole thickness of the obtained transparent capsule 30 is formed nearly uniformly. In addition, let R be the radius of the hemispherical apex part, then the length R1 of the cylindrical part 30b is made to be nearly 1/2<1/2>R. Accordingly, the horizontal sunlight can be efficiently condensed. |
