| 摘要 |
PURPOSE:To improve accuracy by molding a lens holder and a bearing in a single body, forming the bearing sliding part of the lens holder of a material with a low friction coefficient, forming other part of an engineer plastic with a high Young's modulus, and forming a supporting shaft of stainless steel. CONSTITUTION:A supporting shaft 2 is formed of the stainless steel finished to surface roughness of 0.8s grade, for the lens holder, a lens holding plate 3a and a bearing part 3c are molded in a single body by a polyphenylenesulfite resin and a sliding part 3c1 to slide an above-mentioned supporting shaft 2 of the bearing part 3c is formed from a fluorine resin. Thus, a lens holder 3 is molded in a single body with the bearing, the orthotropic property of the lens holding plate 3a and the bearing part 3c is easy to be obtained. Further, since the bearing sliding part 3c1 of the lens holder 3 is formed from the fluorine resin made of a material with a low friction coefficient material and the part except said part is formed of the polyphenylenesulfite which is an engineer plastic with a high Young's modulus, the sliding characteristic of the supporting shaft 2 and the bearing part 3c is not damaged and the accuracy is improved.
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