| 摘要 |
A visor for mounting on a helmet adapted to be worn by an individual, includes a substantially transparent visor having an inner concave surface, and, with references to an orthogonal, right-handed xyz Cartesian coordinate system of spatial reference having is origin located on the inner concave surface and its z-axis parallel to the line of sight of the individual wearing the helmet, the inner concave surface being defined by a cross-section of the visor in the x-axis of reference, which is symmetrical about both the origin and the y-z plane of reference, having one-half of the cross-section of the visor in the x-axis of reference being a first circular segment containing the origin at one end and connected at its opposite end to one end of a first paraboloid segment which is connected at its opposite end to one end of an elliptic segment whose oppose end forms a side boundary of the visor, and by a cross-section of the visor in the y-axis of reference having a second circular segment, one end of which forms an upper boundary of the visor and an opposite end connected to one end of a third circular segment having its opposite end connected to one end of a second paraboloid segment whose opposite end forms a lower boundary of the visor. |
