Micro-lens Array for Homogeneous Laser Line in Triangulation

The patent divides a single lens into multiple micro-lenses arranged in an array. Each micro-lens has alternating curvature signs (convex-concave-convex pattern), creating segmented optical zones that collectively produce a homogeneous light distribution along the laser line while reducing the impact of individual manufacturing irregularities

Different regions of the lens array are designed with alternating curvature signs to create localized optical properties that compensate for each other. The convex and concave micro-lenses create complementary light patterns that, when combined, achieve uniform overall illumination despite local manufacturing variations

By segmenting the optical function across multiple micro-lenses, the patent achieves compact form factor while the alternating curvature pattern ensures that scattering and intensity variations from individual micro-lenses cancel out, maintaining light uniformity despite reduced size

The patent transitions from a single-point lens to a two-dimensional array of micro-lenses with alternating curvatures. This dimensional expansion allows compact packaging while the periodic curvature pattern in the array provides the necessary light distribution control that a single compact lens cannot achieve

The patent segments the optical system into multiple micro-lenses that simultaneously generate multiple light points along the line, replacing the sequential scanning approach. This parallel light generation maintains simple optical components while dramatically increasing measurement throughput

The alternating convex-concave curvature pattern creates a periodic optical structure that generates a regular pattern of light points along the laser line. This periodic arrangement enables systematic coverage of the measurement area, improving measurement speed while maintaining optical simplicity