Six-Lens Imaging System for Wide Angle and Compact Length

The patent applies local quality by assigning specific refractive power characteristics to individual lens elements. The second lens is designed with negative refractive power to control light paths and expand the angle of view, while the fourth lens has positive refractive power to focus light onto the image sensor. This localized optimization of optical properties allows the system to achieve both compact length and wide angle of view simultaneously.

The patent utilizes curved surfaces of lens elements, particularly the concave surface of the second lens and the convex surface of the fourth lens, to manipulate light paths. These curved geometries enable the lens system to bend light rays from wider angles onto the sensor while maintaining a compact overall structure, resolving the contradiction between lens length and angle of view.

The six-lens configuration is designed to perform multiple functions simultaneously: the first lens provides initial light gathering, the second lens with negative refractive power controls aberrations and expands field of view, the third lens refines focus, the fourth lens with positive refractive power directs light to the sensor, while the fifth and sixth lenses correct remaining aberrations. This multi-functional design achieves high resolution for high pixel density sensors without requiring excessive complexity.

The patent optimizes specific parameters of each lens element, including refractive indices, curvatures, and spacing distances, to achieve the desired balance between resolution and complexity. By carefully selecting and adjusting these parameters, the system delivers high imaging quality for high pixel density sensors while maintaining a manageable lens configuration.