| 1. | Then the scratches and spots on the field lens would be visible at the eye lens .
此时场镜上的划痕和小点会在接目镜中看见。
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| 2. | Saddle - field lens
鞍形场透镜
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| 3. | Single field lens
单场透镜
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| 4. | Powermate ? is a technically universal solution , using a positive field lens to redirect field rays
是一个在技术上普遍适用的解决办法，用积极的实地镜头转场射线。
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| 5. | Beam expander and field lens : quadruple beam expansion , biplate structure design , totally enclosed optical system , no lens pollution and without replacement
扩束镜及场镜： 4倍扩束，双片结构设计，全封闭的光学系统，镜片无污染，不用更换。
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| 6. | Image coordinate and galvanometer pendular angle are kept in the computer according to the f9 field lens characteristic , enter pupil excursion and f6 characteristic error are ignored , that the image of laser scanning point move acceding to unlinearity relation is deduced theoretically . for deducing the distortion , error compensation is considered in the software
像点坐标与振镜摆角按f物镜特性的线性关系存储在计算机，在忽略了入瞳漂移和f特性误差后，从理论上推导出二维垂直振镜分布中激光束扫描点的像点按照复杂的非线性关系运动，为了减少几何畸变，在软件设计中给出误差补偿。
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| 7. | To reduce the marking distortion , using the vertical 2 - dimension galvanometer distributing and f field lens focalize , the distance of the second galvanometer to the machining plane is the focus f . to avoid too hign temperature to distroy the resonance cavity because of too long marking time , cooling system and self - protector is used in the design
为减少打标畸变，采用垂直二维振镜分布， f物镜聚焦，将激光束经第二个振镜反射后到加工平面的距离为焦距f ，为了避免打标时间过长，温度过高破坏谐振腔，在设计中加上冷却系统和自我保护装置。
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