Ring-shaped laser spot

摘要

The present invention relates to a projector using laser light, and more particularly to a ring-shaped laser spot (1000) capable of forming a projected image having a ring-shaped projected image (3000) formed from a diffraction fringe, by interposing a diaphragm (300) between a collimator lens (200) and a target (2000). The collimator lens (200) transmits laser light emitted from a laser light source (100) to the target (2000) to form a first projected image (3100) on the target (2000). The diaphragm (300) shapes the laser light transmitted through the collimator lens (200) to form a ring-shaped second projected image (3200) as a diffraction fringe on the target (2000).