Optimization of positioning technology of aspheric compound eyes with variable focal length

Abstract

For single non-uniform surface compound eyes cannot achieve zoom imaging, resulting in poor imaging and other issues, a new type of aspherical artificial compound eye structure with variable focal length is proposed in this paper. The structure divides the surface compound eye into three fan-shaped areas, and different focal lengths of the micro-lens in different area make the artificial compound eye zoom in a certain range. The focal length and size of the micro-lens are determined by the area and the location of the micro-lens. The optimization of aspherical array of the micro-lens is calculated and the spherical aberration in each area is reduced to one percent of the initial value. Through simulation analysis, the designed artificial compound eye structure can realize the focal length adjustment, and effectively reduce the problem of the poor imaging quality of the curved compound eye edge. As a result, the aspherical artificial compound eye sample with the number of eyes of n=61 and the diameter of the base of 8.66mm was prepared using the molding method. The mutual relationship between the eyes of the child was calibrated and a mathematical model for the simultaneous identification of multiple sub eyes was established. An artificial compound eye positioning experimental system with the error value less than 10% was set up through a number of micro-lens capture target point settlement coordinates.

Study on high fidelity method of multi-focus microlens array based on digital microlens device

“…In recent years, optical systems using microlens arrays have been deeply studied in various applications, such as optoelectronics [1], medical [2][3], digital display, 3D printing [4] and 3D imaging systems [5] [6], due to their advantages such as small size, flexible transformation mode, light weight and large field of view. Especially in the integrated imaging system of 3D display, multi-focal length microlens array with different focal lengths is adopted, which can greatly improve the depth of field of view without reducing the spatial resolution.…”

Bioinspired Zoom Compound Eyes Enable Variable-Focus Imaging

“…With the confinement of surface wrinkles, hemispherical surfaces with MLA can be prepared on poly­(dimethylsiloxane) (PDMS) . Yi’s group studied the design and fabrication of a three-dimensional compound eye consisting of a microprism, aperture, and MLA using traditional two-dimensional diamond turning technology, which validated the feasibility of ultraprecision machining in micro-optical devices. , Besides, three-dimensional (3D) biologically inspired compound eyes with low roughness (2.5 nm) were prepared by Wu through the combination of two-photon photopolymerization − and UV polymerization technologies, in which high-precision and nonplanar MLAs can be fabricated in a high-efficient manner. , Liu et al proposed a new type of aspherical artificial compound eye structure, which addressed the issue that single-layer nonhomogeneous curved compound eyes cannot achieve zoom imaging. , Recently, an etching-assisted laser machining method , has successfully been developed to fabricate large-area and precise artificial compound eyes by mimicking natural compound eyes. , …”

“…Nevertheless, unlike natural compound eyes that rely on the visual organs mentioned above, artificial compound eyes should be designed and produced based on an electronic digital imaging system. Despite the fact that attempts at developing tunable microlens systems have been made in recent years, ,,− for instance, using smart materials, reports on dynamically tunable compound eyes are still rare. Actually, tuning the imaging performance of a compound eye can be achieved by varying the FOV, focal length of ommatidia, and the geometry of the main lens.…”

“…20,21 Liu et al proposed a new type of aspherical artificial compound eye structure, which addressed the issue that single-layer nonhomogeneous curved compound eyes cannot achieve zoom imaging. 22 Recently, an etching-assisted laser machining method 24,25 has successfully been developed to fabricate large-area and precise artificial compound eyes by mimicking natural compound eyes. 26,27 However, most of the previously reported compound eyes are not flexible and thus do not permit tunable imaging.…”