Bulk-shaped lens, light-emitting unit, lighting equipment and optical information system

摘要

The present invention is directed to an optical lens (20) preferable for using semiconductor light-emitting elements such as light emitting diodes. In order to provide a bulk-shaped lens providing a desired illumination intensity without requiring large number of the light sources, the lens embraces a bulk-shaped lens body identified by a top surface, a bottom surface and a contour surface; and a well-shaped concavity (6) implemented in the inside of the lens body, aligned to the top surface from the bottom surface along an optical axis of the lens body. The lens body has geometry such as bullet-shape or egg-shape. A ceiling surface (2) of the concavity implemented in the lens body serves as first lens surface, the top surface (3) of the lens body serves as a second lens surface, the inside of the concavity serves as a storing cavity of light source or photodetector, and a distance between the first and second lens surfaces along the optical axis is larger than a radius of curvature of the second lens surface.