デジタルビデオカメラとデジタルスチルカメラにおける，外部環境に強いオートレンズカバーの開発設計（電磁石アクチュエータの電磁場シミュレーション設計を用いて）

抄録

In the digital video camera and the digital still camera, it is necessary to cover to protect the lens, because lens is prevented being damaged by grit and dust storm etc. of outside environment. There are a lot of manufacturers that has a lot of defective products of the lens cover. Many of lens cover products have caused the defect that the cover doesn't open even if it turns on power. A reason of many causes is as follow. When the grit the dust storm enters to the internal mechanism of the lens cover, the gear doesn't rotate. The lens cover is set to defend the lens from the scratch and protect from dirt and pollution, and to reduce the trouble of the product, but it yields opposite effects. "To defend the lens from the scratch, we want to close the cover firmly at any condition." Is above-mentioned the demand definition of the lens cover really correct really? We pursue a blind spot of the idea and target rationality. We redefine the demand of the lens cover.