Autofocusing Imaging Device for Fixed-Focus Lenses

The patent applies the dynamics principle by making the imaging device movable along the optical axis rather than fixed. The imaging device can dynamically adjust its position to achieve focus at different object distances, transforming a static fixed-focus system into a dynamic autofocus system without changing the lens itself.

Instead of moving the lens to achieve focus (traditional autofocus method), the patent inverts the approach by moving the imaging device to achieve focus. This inversion allows standard fixed-focus lenses to function with autofocus capability through a different mechanism.

The patent uses a cheap movable imaging device assembly instead of an expensive autofocus lens. The imaging device with motor can be easily replaced and does not require costly optical components, achieving autofocus functionality through mechanical movement rather than expensive optical design.

The patent extracts the autofocus function from the lens and relocates it to the imaging device. By separating the focusing mechanism from the optical system and placing it in the imaging device, the lens remains simple and inexpensive while still achieving autofocus capability.

The imaging device performs self-service by automatically moving to the correct focus position using its built-in motor and control system. The device monitors its own position and adjusts autonomously without requiring manual intervention, achieving both simplicity and automation.

The patent implements feedback control where the imaging device monitors its position and the focus status, then automatically adjusts its location to achieve optimal focus. This closed-loop control enables automatic focusing with simple optical components.