Field of vision视野设计要求

When tested according to EN 1080, there shall be no occultation in the field of vision bounded by angles as follows按照EN 1080测试时，以下角度限定的视野内不应存在掩蔽现象
- horizontally: min 105° from the longitudinal vertical median plane to the left and right hand sides; 平方向:纵向垂直中位面至左右两侧最小105°;
- upwards: min 25° from the reference plane; 向上:距参考平面至少25°;
- downwards: min 45° from the basic plane. 向下:基本平面向下45°。

Construction结构设计要求

The helmet normally consists of a means of absorbing impact energy, a means of retaining the helmet on the head and a self-release system.
该头盔通常由吸收冲击能量的装置、保持头盔在头部的装置和自我释放系统组成。
The helmet shall be so designed and shaped that in normal use the parts of it in contact or in potential contact with the user shall be free of roughness, sharp edges, projections and anything which could be harmful to the user.
头盔的设计和形状应使其在正常使用中与用户接触或潜在接触的部分不应有粗糙、尖锐边缘、凸出和任何可能对用户有害的东西。
Helmets should:头盔应当
have low weight; 较轻的重量；
be ventilating; 保证通风性；
be easy to put on and take off; 穿脱方便;
be usable with spectacles; 可以配护目镜使用;
not significantly interfere with the ability of the user to hear traffic noise. 不会明显干扰使用者听到交通噪音的能力。