Patent attributes
An automatic focal point control apparatus is provided. The apparatus includes a base fixed in the camera, which includes a cylindrical projection extending from a top surface thereof and into which part of a lens barrel is inserted; a bobbin inserted into the cylindrical projection on the base that includes a plurality of electromagnets around which coils are wound; a rotation body that includes a support ring rotatably connected to the outer circumference of the adaptor and a ring-shaped permanent magnet fixed onto an outer surface of the support ring and that has a plurality of N poles and an equal number of S poles alternately arranged at regular intervals; and a housing detachably mounted on the base that includes a space unit formed inside that includes the bobbin, rotation body and adaptor, and a through hole formed inside so that light and image are projected onto the adaptor.
