| 摘要 |
PURPOSE:To enable measurement without limitations by head size so as to measure the head at three planes or more simultaneously and even if the examine lies on his side by properly setting the center angle of a first cylindrical surface portion, and the radii of the first to third cylindrical surface portions and that of a spherical portion. CONSTITUTION:A head-measuring Dewar D has a measuring face F opposite to the head and having a first cylindrical face portion Fca with a radius of 80mm to correspond to a 100-degree center angle. A first planar portion Ffa extends in the direction of a tangent so that the measuring face F has a second cylindrical face portion Fcb, which gets closer to the axis of the first cylindrical face portion Fca and has a radius of 80mm to correspond to a 90-degree center angle. Further, a second planar portion Ffb extends in the direction of a tangent so that the measuring face F has a third cylindrical face portion Fcc, which gets closer to the axis of the first cylindrical face portion Fca and to the direction of the second cylindrical face portion Fcb and has a radius of 80mm to correspond to a 90-degree center angle. The measuring face F also has a spherical portion Fb with a radius of 80mm and a third planar portion Ffc. |
