Biological vision offers intriguing inspiration for functional features in imaging systems with small form factors. We report biologically inspired intraoral camera (BIOC) for assorted dental imaging. This fully packaged BIOC features a convex-concave lens, inverted microlens arrays (iMLAs), LED module, and a single CMOS image sensor on a flexible printed circuit board in a handpiece holder. The iMLAs also collect light from wide angles by mounting the convex-concave lens to increase the viewing angle. The clinical trials have been successfully conducted for real-time and multifunctional intraoral monitoring of human teeth, including infinite depth of field, close-up, wide field-of-view, three-dimensional, and autofluorescence imaging. This biomedical camera provides insights for functional imaging not only in dental applications but also in surgical robots and endoscopy applications.
The Tabanidae has a unique eye structure that structural color filter in cornea display advantages for color vision system. The combination of color filter layers and ommatidia can provide the advantages of miniaturization, and multispectral imaging. We report an ultrathin multi-spectral camera inspired by the structure of Tabanidae vision system. The ultrathin multi-spectral camera consists of Fabry-Perot color filter arrays, microlens arrays with chrome aperture, and a CMOS image sensor. The fully packaged camera shows a FWHM under 31nm, a total track length of 1mm. This provides new opportunity for point-of-care testing (POCT) and medical applications.
High-speed imaging provides an opportunity to access detailed information in various biomedical fields. However, conventional high-speed cameras still suffer from slow framerates or difficulty to resolve dense information. This study presents a compact ultrafast camera by combining a compound eye camera inspired by the nature insect with an offset array. OFAC is packaged within 10.4 × 8.3 × 1.5 mm3 excluding image sensor boards, and successfully resolves high-temporal image sequences up to 91,200 framerate. The proposed ultrafast compound eye camera will provide new methods to approach miniaturized high-speed biomedical imaging.
This work reports the first demonstration of plasmonic hyperspectral camera by using an active plasmonic tunable filter (APTF) consisting of ultrathin angle-sensitive nanostructures and compact bimorph actuator. APTF clearly exhibits continuous peak shifting from 800 nm to 1000 nm depending on voltages with 1.0 - 3.0 V. Then, fully packaged with compact B/W camera which accomplished the compact plasmonic hyperspectral camera (PHC) with total size of 16 x 16 x 28 mm. Finally, hyperspectral imaging was demonstrated using the PHC so that the featured spectrum of fruits and hand vein was successfully reconstructed.
Eyes of insects in the nature have been evolved in assorted structures according to the place of residence, hours of living, or the way of perception. The structure of the insect eye not only has different composition that dissolve the incoming light according to its direction of origin, i.e., an apposition and a superposition eyes, but also has a wide field-of-view (FOV), a high spatial resolution, and a sensitivity. Conventional artificial compound eye cameras have limited features that only focus on one of the characteristics of the insect eye, such as lens diameter and lens barrel length. We report an optically adjustable ultrathin arrayed camera, which adjusts the FOV, lens diameter and focal length independently. The ultrathin arrayed camera consists of UV-curable resin based microlens array on CMOS image sensor and each lens is surrounded by a liquid-filled blocking layer to reduce optical cross-talks between neighboring lenses. Fabrication of the arrayed lens includes photolithography process of Au/Cr metal pattern on frontside and Cr pattern on backside of borosilicate glass. Each of the lenses are replicated from microhole arrays fabricated by isotropic wet etching of the borosilicate glass with HF (49%) etchant. The arrayed camera has adjustable lens diameter and curvature by etching time control and SU-8 post thickness control during photolithography. Fingerprint image was successfully obtained by an image processing from individual optical channels. This ultrathin arrayed camera will suggest a new approach to the development of light-filled camera and compact ultrathin camera in the medical, industrial, or military fields.
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