Ball-Lens Optical Detector for Angle-Independent Throughput

The patent divides the imaging function into multiple segments: a ball lens for wide-angle light collection, multiple lightguides for spatial separation, and an array of photodetector segments for parallel detection. This segmentation allows each component to be optimized independently, using inexpensive ball lenses and standard lightguide technology to achieve high throughput without requiring expensive single-element lenses.

The patent transitions from a single-lens imaging approach to a multi-dimensional light transport system using lightguides that physically separate and redirect light paths. This dimensional transformation enables the system to achieve lens-like focusing capabilities through geometric lightguide arrangements rather than expensive optical lenses, reducing cost while maintaining throughput.

The patent employs a ball lens with a spherical geometry that inherently provides wide-angle light collection and focuses light onto a curved focal surface. This spherical design is superior to conventional planar lenses, enabling inexpensive optics to achieve high throughput and angle-independent performance by utilizing the natural focusing properties of the spherical shape.

The patent introduces lightguides as intermediary elements between the ball lens and photodetector array. These lightguides act as mediators that transport and spatially separate light from different incident angles, enabling the system to achieve high throughput and angle independence without requiring expensive lenses. The lightguides compensate for optical limitations by providing controlled light path management.

The patent segments the photodetector into multiple discrete segments arranged in an array, with each segment corresponding to a specific lightguide output. This segmentation allows the system to handle the curved focal plane by distributing detection across multiple points, simplifying the overall design while maintaining wide-angle reception capability through parallel processing of light from different angles.

The patent resolves the curved focal plane issue by transitioning from a single-point focus to a distributed array of photodetector segments. This dimensional expansion from one point to multiple points allows the system to accommodate the spherical focal surface of the ball lens, converting the curvature challenge into an advantage for wide-angle light collection while maintaining simple photodetector placement through standardized array fabrication.