Light guide structure with multiple reflection molded surfaces and ultramicro-distance imaging module comprising light guide structure

Abstract

The invention discloses a light guide structure with multiple reflection molded surfaces; the end surface of an image space is provided with a first groove and is over against an illuminator, and a light condensation molded surface is formed at the bottom of the groove; the light guide structure is internally provided with the multiple reflection molded surfaces; the multiple reflection molded surfaces comprise a light splitting reflection molded surface, a back reflection molded surface, and an emergent front reflection molded surface; the light splitting reflection molded surface is formed by the groove bottom of a second groove which is formed in front of the first groove and in the end surface of the object side; the back reflection molded surface is formed at the groove bottom of a third groove formed in the side of the first groove and the end surface of the image side; the emergent front reflection molded surface is formed in front of the third groove, on the outer side of the emergent molded surface and on the wall surface of the object side; and a light path comprises that light from the illuminator is emitted into the illuminator through the light condensation molded surface, sequentially passes through the light splitting reflection molded surface, the back reflection molded surface and the emergent front reflection molded surface, and finally is emitted to the object surface from the emergent molded surface. Through the optimized design of the structure, the imaging module is small and exquisite, light, high in reliability and good in imaging quality. A plurality of light guide light paths are formed by constructing the multiple reflection molded surfaces, so that illumination from the illuminator of portable imaging equipment is sufficient, the uniformity is high, and meanwhile, the light guide structure is easy to manufacture and assemble.

Description

technical field [0001] The invention belongs to the field of external optical imaging, and in particular relates to a multi-reflection surface light guide structure and a super macro imaging module containing it. Background technique [0002] With the development of optical imaging technology, imaging devices are added to more and more instruments and consumer products, and the diversity and importance of their functions are also increasing. Various imaging modules are emerging in the market, but in AMD In the field of imaging, there is no mature modular product yet. [0003] As for the imaging module, most of the current ordinary macro modules are manual focus modules equipped with wide-angle macro lenses, which make up for the lack of lighting. Lighting beads are often simply arranged around the lens to make it within the imaging field of view. For lighting, such as the Chinese Utility Model Patent Publication Document with the application number CN200720057106.0 and the ...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the limitation of its own wide-angle macro lens, the module cannot automatically focus through the lens of the mobile device itself. In actual use, manual focus operation is inconvenient, and it is difficult to directly capture clear images

[0005] 2) The lighting source is directly irradiated by lamp beads. During the moving process of the object, the uniformity of the actual lighting effect will change greatly, especially in the ultra-macro imaging environment where the object surface is very close, the lighting will be seriously insufficient, and When observing high-reflective surfaces with this lighting mode, there will be strong and concentrated reflections, which will affect the image quality

[0006] 3) The lighting components need to be powered separately, instead of directly using the flash LED light source that is common on mobile devices at present. There are cases where the battery needs to be charged or replaced with the same type of battery after the battery is exhausted, which is inconvenient to use

[0007] Changing the exit angle of the lighting source, adding guiding components for the light, and controlling the LED light-emitting angle can all improve the lighting problem. For example, the Chinese utility model patent with the application number CN201720470643.1 discloses a micro In the case of improving the illumination of the distance imaging module, the specific lighting angle of the lamp beads is also required. The advantage of this solution is that it solves the problem of limited supplementary light for the macro imaging module, but it has many components and the structure is too complicated. The difficulty is high, which is not conducive to the miniaturization and integration of modules, and the cost increases

[0008] The Chinese utility model patent with the application number CN201920098694.5 discloses a scheme for improving the macro imaging module through a light guide structure. The advantage of this scheme is that the illumination of the macro imaging module is uniform and the overall volume is controlled, but The optical lens with a symmetrical structure that integrates the autofocus module involved in this solution is currently unfinished, and the module is installed inside the device as a whole. It is necessary to consider the occupancy of the whole machine and the shielding of stray light inside the fuselage. Its design And the manufacturing difficulty and cost are relatively high. The Chinese invention patent with the application number CN201811055795.0 has announced a macro module that is externally connected to the camera of the device and illuminated by a light guide structure. In this solution, the lighting source is a built-in circuit and a light-emitting diode, and The LED flash light of the device itself is not directly used, which increases the cost of the product itself, and needs to replace the battery, which is inconvenient to use

[0009] The Chinese invention patent with the application number CN201811003701.5 released a macro imaging module that illuminates the object surface through a light guide structure. It is equipped with multiple models and the structure is simple and easy to use, but this invention has the same defect as the above-mentioned utility model or invention: the lens of the module is in direct contact with the outside world, the outermost lens is easily damaged or polluted, and the reliability is not high

[0010] The Chinese patents with application numbers CN201922072118.6 and CN201922072041.2 disclose a mobile terminal, at least one of the multiple lenses is a main camera lens and at least one is a super macro lens, which can realize super macro shooting and meet the needs of close-up super The demand for macro shooting; however, this solution requires the mobile terminal itself to have a super macro lens, which cannot meet the super macro shooting needs of ordinary mobile phones without a super macro lens.

[0011] The miniaturized ultra-macro imaging module and its imaging equipment have great application prospects and value in the fields of biomedicine, intelligent manufacturing, and consumer electronics. At present, there is a lack of products that can fully solve the above problems

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