Bidirectional centering alignment method of infrared lens group

Abstract

The invention relates to a bidirectional centering alignment method of an infrared lens group. The method comprises the steps: coinciding the mechanical axis of a lens cone with the rotational reference axis; drawing a mark line on the upper surface of each lens; the lowest lens is arranged on the installing surface of the corresponding lens frame, and the deviation vectors C1 and C2 of the curvature center corresponding to the upper and lower surfaces of the lens with respect to the rotational reference axis are respectively measured by upper and lower optical path measuring heads; the lens is fine-adjusted until C1 and C2 meet the adjustment requirements; recording C1 and C2, drawing the mark line on the upper surface of the lens frame corresponding to the lens, aligning the two mark lines and removing the lens after marking; repeating the previous three steps and preliminarily adjusting other lenses in turn; the lowest lens is arranged on the corresponding installing surface and thetwo mark lines are aligned, the deviation vector C1' is measured by the upper optical path measuring head, and the lens is fine-adjusted until C1' is equal to C1; the special adhesive is utilized tobe filled in the gap between the lens and the corresponding lens frame and the lens is fixed; and the previous two steps are repeated, and other lenses are reset, adjusted and fixed from bottom to topin turn.

Description

technical field [0001] The invention belongs to the field of optics, and relates to an assembly and adjustment method of a lens group, in particular to a two-way centering and adjustment method for an infrared lens group. Background technique [0002] The precise centering of the infrared lens is the premise and basis for good imaging of the whole system. The centering of the lens is to adjust the optical axis of each lens in the optical system (the line connecting the centers of curvature corresponding to the two surfaces) to be highly coincident with the reference axis, so as to ensure the consistency of the optical axis of each lens in the optical system. Over the years, visible light dual optical path centering instruments are usually used at home and abroad to measure and adjust the centering of a single piece or a single side of the lens in the infrared system. The adjustment accuracy is limited, and it is becoming more and more difficult to meet the ever-increasing in...

AI Technical Summary

Problems solved by technology

Over the years, visible light dual optical path centering instruments are usually used at home and abroad to measure and adjust the centering of a single piece or a single side of the lens in the infrared system. The accuracy of the adjustment is limited, and it is becoming more and more difficult to meet the ever-increasing adjustment accuracy of the infrared system. Require

[0003] The laser infrared centering instrument that has appeared in recent years can center the two surfaces of the infrared lens, but it is expensive, and the systems for the two bands of infrared mid-wave (3μm-5μm) and long-wave (8μm-12μm) need to be purchased separately Equipment in the corresponding band will undoubtedly increase the purchasing pressure of users

Xing Hui et al. (Patent No.: CN102998767 A) realized the two-way centering of the infrared lens by the visible light centering instrument through the special design of the frame, but this method needs to position the flange when designing the frame, which increases the volume and weight of the lens. It is not conducive to the light weight and miniaturization of the product; in addition, the positioning of the adjusted lens needs to be realized by pinning. Since the structural forms of different products are different, when the operating space is limited, it is difficult to match the pins.

Therefore, this method is difficult to generalize

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