Optical Engine Module with Bifocal Lens and Half Waveplates

The patent employs electrically controlled half waveplates that can dynamically switch the polarization state of light, enabling the optical system to transition between different focal lengths in real-time. This dynamic reconfigurability allows the imaging distance to be adjusted without physical movement of optical components, resolving the contradiction between adaptability and structural simplicity.

The patent changes the polarization state parameter of light using electrically controlled half waveplates to achieve different focal lengths. By modifying this optical parameter electrically rather than mechanically, the system achieves adjustable imaging distance while maintaining a relatively simple overall structure, as the focal length change is achieved through parameter modulation rather than component relocation.

The patent replaces mechanical adjustment mechanisms (such as movable lenses or adjustable mounts) with an optical parameter-based solution using electrically controlled half waveplates. This substitution eliminates the need for mechanical moving parts and structural reinforcements, thereby reducing the module weight while achieving the same functional goal of adjustable imaging distance.

By using electrically controlled half waveplates to change the polarization state parameter of light, the system achieves focal length adjustment without adding substantial mechanical components. This parameter-based approach minimizes the weight increase that would otherwise result from adding multiple optical components for distance adjustment.

The patent replaces mechanical adjustment systems with an optical parameter-based solution using half waveplates. This substitution avoids the need for additional spatial components and mechanical structures, thereby minimizing the increase in module size while achieving adjustable imaging distance through optical parameter modulation rather than physical expansion.

The patent utilizes the polarization dimension of light as an additional degree of freedom to achieve focal length adjustment. Instead of adding components in the spatial dimension, the system exploits the polarization state dimension to control optical path length and focal length, thereby achieving adjustability without increasing the physical volume of the module.