Patent ID: 7581840
Filing Date: 2009-09-01
Classification: G03B

Abstract:
1. A projection apparatus, comprising: a main body; an illuminating optical system formed on the main body that generates and emits light; an image formation unit formed on the main body that converts the light emitted by the illuminating optical system into an optical image; a projection lens unit that receives the optical image converted by the image formation unit; a focus lens unit affixed to the projection lens unit and adapted to move in a direction of an optical axis (OX) when rotated; and a controller rotatably formed on the main body that transmits rotary power to the focus lens unit and is adapted not to move in the direction of the optical axis (OX), wherein the controller includes a ring-shaped body into which one end of the focus lens unit is selectively inserted in an inner portion thereof, wherein the main body includes