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一、镜筒下滑故障现象是用手轮将镜筒上升后,手一离开,镜筒就自行下滑或稍受外力就自行下滑.这种故障,极易损坏切片或物镜.造成的原因,主要是齿轮轴的摩擦力过小,控制不住镜筒的自然下落.控制镜筒大幅度上升下降运动的部分称粗调焦结构,图1是常见的一种轴套式结构.为了便于看清,分为(甲)、(乙)两部分绘出.
1. The phenomenon of lens tube sliding down is that the lens tube is raised by the hand wheel and the hand is left. The lens tube slides on itself or slightly falls under the influence of external force. This type of failure can easily damage the slice or the objective lens. The friction force of the gear shaft is too small to control the natural fall of the lens barrel. The part that controls the lens barrel to rise and fall greatly is called the coarse focusing structure. Figure 1 is a common shaft sleeve structure. To make it easier to see Divided into two parts (a) and (b).