| 摘要 |
The present invention provides a limited area reflective optical sensor and an electronic device which can detect an object with variable distance from a surface to be measured by broadening the range of detection in perspective direction, with a high precision and has a simple configuration. As a solution, among optical paths of a projected light (L1) is configured such that: a retro light reception side part is composed of a first curvature surface (12ba) having a first curvature; a lens for projected light (12A) is arranged wherein a light reception side part of a light reception part (20) rather than the retro light reception side part is composed of a second curvature surface (12bb) having a second curvature, which is a curvature smaller than the first curvature; among the paths of a reflected light (L2), a repulsive light side part is composed of a fourth curvature surface (22ba) having a fourth curvature; and an emission part side part of an emission part (10) rather than the repulsive light side part is composed of a fifth curvature surface (22bb) having a fifth curvature which is a curvature smaller than the fourth curvature satisfies at least one part equipped with a lens for reflective light (22). |
