PROBLEM TO BE SOLVED: To review dimensional accuracy of each component of a photographic lens unit for an endoscope and to improve a product yield.SOLUTION: A first lens movable frame 26 and a second lens movable frame 27 are engaged with a cam shaft, and first and second movable lenses are individually moved in an optical axis direction by rotation of the cam shaft. The first and second movable frames 26 and 27 are constituted of ferromagnetic materials. A permanent magnet 50 is disposed in a recess of a coupling portion 32 of a housing 13. Each of the lens movable frames 26 and 27 is caused to adhere to one coupling surface 35a in a biased manner by magnetic force of the permanent magnet 50. A space C1 is formed between other coupling surface 35b and each of the lens movable frames 26 and 27, and each of the lens movable frames 26 and 27 is moved to one side in a moving hole 35. Each of the lens movable frames 26 and 27 is sliding-guided by only one coupling surface 35a, and smooth movement thereof can be performed. A total number of combinations of the lens movable frames 26 and 27 that become acceptable products and the housing 13 is increased. Accordingly, a product yield ratio is improved.COPYRIGHT: (C)2013,JPO&INPIT【課題】内視鏡用撮影レンズユニットの各部品の寸法精度を見直し、製品歩留りを向上させる。【解決手段】カム軸に第1レンズ移動枠26、第2レンズ移動枠27を係合させ、カム軸の回転により、第1及び第2可動レンズを個別に光軸方向に移動させる。第1及び第2レンズ移動枠26,27を強磁性体から構成する。ハウジング13の連結部32の凹部に永久磁石を50を配置する。各レンズ移動枠26,27を永久磁石50の磁力によって一方の連結面35aに付勢するように吸着させる。他方の連結面35bと各レンズ移動枠26,27との間に隙間C1が形成され、各レンズ移動枠26,27が移動穴35内で片寄せされる。一方の連結面35aのみにより各レンズ移動枠26,27が摺動案内され、円滑な移動が可能になる。合格品となるレンズ移動枠26,27とハウジング13の組み合わせ総数が増え、歩留り率が向上する。【選択図】図4
