透镜单元，镜筒，光学装置，图像读取单元，扫描仪和图像形成设备。
Lena unit, lens, optical device, image reading unit, scanner and image forming device.
复合显微镜包括两个短焦距凸透镜，即位于镜筒两端的物镜和目镜。
The compound microscope consists of two convex lenses with short focal length, the objective and eyepiece lenses, fitted at opposite ends of a tube.
透镜驱动装置，透镜筒，光学设备和组装透镜驱动装置的方法。
Lens driving device, lens barrel, optical apparatus, and method for assembling lens driving device.
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