| 摘要 |
A preloaded device includes a female component having a right-circular cylindrical internal surface and a first helical groove in the internal surface of the female component. A male component has a right-circular cylindrical external surface sized to be slidably received within the right-circular cylindrical internal surface of the female component, and a second helical groove in the external surface of the male component. The second helical groove has the same pitch as the first helical groove so that the second helical groove is in facing relationship along its length to the first helical groove when the male component is assembled to the female component. A spring component is received within the first helical groove and the facing second helical groove when the male component is assembled to the female component. The spring component has three shape distortions thereon equidistantly spaced around the circumference of the spring component so as to press the spring component against the first helical groove and the second helical groove. The device accomplishes a preloaded helical movement of the female component and the male component. The female component and/or the male component may support an optical lens, so that the preloaded device functions as a zoom lens.
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