Camera lens optical system and camera

Abstract

The invention discloses a video camera lens optical system and a video camera. The video camera lens optical system comprises a dual-concave lens (1), a first dual-convex lens (2), and a dual-combined lens group which are successively arranged from object space to image space. The dual-combined lens group comprises a second dual-convex lens (3) and a concave-convex lens (4) which are combined together. The second dual-convex lens (3) and the concavo-convex lens (4) satisfy a formula (1) and a formula (2) which are described in the description, wherein in the formulas (1) and (2), v3 and v4 are the abbe numbers of the material of the second dual-convex lens (3) and the concavo-convex lens (4) respectively, [phi]3 and [phi]4 are the focal power of the second dual-convex lens (3) and the concave-convex lens (4) respectively, and the [phi] is the focal power of the dual-combined lens group. The video camera lens optical system may clearly form images in a visible spectrum and a near infrared spectrum, satisfies a requirement of a high-definition day and night video camera, uses four lenses produced by common material, and is simple in structure, easy to produce, and low in cost compared with a lens in a same specification.

Description

technical field [0001] The invention relates to the field of camera technology, in particular to a camera lens optical system and a camera, especially a lens optical system for day and night cameras. Background technique [0002] Day and night cameras refer to cameras that can clearly image both day and night. At present, in order to take into account the needs of monitoring the environment during the day and at night, day and night cameras are more and more widely used. The operating spectrum range of the day and night camera is the visible spectrum (430nm to 700nm) during the day, and the near infrared spectrum (830nm to 870nm) at night. Therefore, the day and night camera requires that the lens used in conjunction with it can clearly image in both the visible spectrum and the near-infrared spectrum. Generally, the larger the working spectral range, the more difficult the lens optical system design is. In order to ensure that the lens can clearly image in the visible sp...

AI Technical Summary

Problems solved by technology

Although there are some day and night camera lenses with simpler structures, the clarity of the imaging picture is not good enough to meet some inspection fields that require higher imaging clarity.

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