LENS DRIVING APPARATUS FOR 3-BEAM PROJECTOR

摘要

Disclosed is a projection system of which three projecting lenses could be controlled integrally. A holder has an upper plate and a lower plate. A plurality of longitudinally slanted guiding holes are formed at the left and right portions of the upper and lower plate. A first, a second and a third projecting lens holders having cylindrical shapes are provided in the holder housing. Projecting lenses are provided at the front sides of the holders. Movable pins are protrusively formed at the upper and lower portions of the first and third projecting lens holders and are inserted into corresponding longitudinally slanted guiding holes. A holder supporting plate has a first and a second holder brackets for supporting the second projecting lens holder, and four leg portions and guiding grooves formed at the leg portions for inserting the movable pins. A driving motor and a transporting apparatus are provided. The image control is advantageous and the keystoning phenomenon is eliminated.