OPTICAL SOURCE HAVING FOCUSING PATTERN AND SIZE VARIED ACCORDING TO DISTANCE BETWEEN CONVEX AND CONCAVE LENSES

摘要

PURPOSE: An optical source is provided to vary a focusing pattern and a size of a light illuminated from the optical source by varying a distance between convex and concave lenses. CONSTITUTION: A cylindrical or a bar-type body(10) has a hollow portion therein. An optical source for illuminating light is implemented in the body. A convex lens(12) focuses the light illuminated from the optical source to one point. A concave lens(11) illuminates the condensed light to a target which is far away by a predetermined distance. A reflective mirror(14) is implemented on a rear portion of the optical source to prevent a rear-reflection of the light from the optical source. A power control circuit(20) includes a variable resistor and a battery to supply power to the optical source.