OPTICAL SYSTEM OF LED VARIABLE-FOCAL-LENGTH IMAGING LAMP

摘要

An optical system of an LED variable-focal-length imaging lamp comprises an LED light source module (1), a light-gathering assembly (2), a cutting assembly (3) and a zoom lens group that are successively mounted along a light path. Geometric centers of these components are collinear with a primary optic axis A, and a focus F1 of the light-gathering assembly (2) coincides with a focus F2 of the zoom lens group. The zoom lens group comprises a first zoom lens (4), a diaphragm (5) and a second zoom lens (6). The first zoom lens (4) and the second zoom lens (6) can move back and forth along the primary optic axis A to achieve a variable focal length, and the diaphragm (5) is provided between the first zoom lens (4) and the second zoom lens (6) and has an adjustable clear aperture. Such an optical system may be widely applied in an LED variable-focal-length imaging lamp, to replace an existing LED fixed focal-length imaging lamp with different angles and high-consumption halogen-bubble light source imaging lamp. By designing a diaphragm (5) in a zoom lens group, off-axis aberration can be effectively alleviated, off-axis stray light can be reduced to pass through, and a clearer image can be formed.