| 摘要 |
FIELD: applicable for operation with semiconductor laser or light-emitting diode. ^ SUBSTANCE: the objective has four components, the first and the fourth of which are positive ones, the first component is made in the form of single biconvex lens, and the fourth component is made in the form of a meniscus turned with the concave surface to the image space. The second component is made in the form of a negative meniscus turned with concave surface to the object space, the third component is made in the form of a single flat-convex lens, whose flat surface is turned to the image space. The thickness of the fourth component makes up at least 0.3 of the objective focal length. The relation of the focal length of the first and second components in the absolute value does not exceed 0.7, and the relation of the focal lengths of the fourth and third components does not exceed 1.1. ^ EFFECT: enhanced quality of image and increased rear section of the objective, with the total length remaining unchanged. ^ 4 dwg |
