Collimator objective lens and detection instrument

Abstract

The invention relates to a collimator objective lens and a detection instrument, belongs to the technical field of laser information field misalignment detection, and solves the problem of poor detection precision of a laser information field in the prior art. The collimator objective lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object space to an image space. The first lens, the third lens and the fifth lens are biconvex lenses, and the second lens and the fourth lens are biconcave lenses; the first lens is connected with the second lens in a gluing mode, and the fourth lens is connected with the fifth lens in a gluing mode. In the two convex surfaces of the third lens, the radius of the convex surface facing the object side is small, and the radius of the convex surface facing the image side is large. The detection precision of the laser information field is improved, and the manufacturing cost is reduced.

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