Mechanism and method for focusing optical system using gear and timing belt

The focusing mechanism for the optical system by gear and timing belt comprising the following components:

• An optical front cover module;
• An optical rear cover module;
• A focusing mechanism;
• A protection and mounting mechanical system, each components is demonstrated as follows:
• The optical front cover module comprises of one or several fixed lenses element mounted on the mechanical housing;
• the lens element are optically aligned;
• the optical front cover module is immobile in the focus adjustment process including the first lens element, the middle lens element and mechanical of front cover;
• The optical rear cover module comprises a last lens element mounted in mechanical of rear cover module and optically aligned with the lens elements of front cover module, the mechanical component which hold the last lens element and a large gear for motion transmission;
• A focusing mechanism consists of an actuator that transfers the motion from the an adjustment ring to the translational motion between the lens elements of the optical system and adjusts the focus of the beam light on a sensor plane, thereby providing focusing features for the system and the focusing mechanism, including:
• an adjustment ring, a radial shaft seal, a transmission shaft, a timing pulley, a timing belt, a ball bearing and a large gear;
• A protection and mounting mechanical system:
• Including a protection mechanical cover, an inner mechanical mounting inside to mount and fix the components of optical system as well as a focusing mechanism and also protect the system from the effect of outer environment.