Design and assessment of microlenslet-array relay optics

Shaoulov, Vesselin; Rolland, Jannick P.

doi:10.1364/ao.42.006838

Cited by 14 publications

(15 citation statements)

References 8 publications

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“…In contrast to highly symmetric relaying array optics [151,157] such instances occur very rarely in the CLEY, because the pitches of the different microlens-and aperture arrays have no rational relation. However, the lateral repeating of the superstructure of the Gabor superlens and consequently spurious light are a natural property of this arrangement of MLAs (see Section 2.2).…”

Section: H Non-sequential Raytracing Analysis Of Cleymentioning

confidence: 98%

“…A close-up imaging of documents, displays and intermediate images ("relay optics") with refractive microlens- [150] or telescope arrays having a unity magnification [66,67,[151][152][153][154], variable magnification using Alvarez lenses [155] or small demagnification [156,157] was proposed, theoretically analyzed or experimentally demonstrated.…”

Section: State Of the Art Of Man-made Vision Systemsmentioning

confidence: 99%

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Micro-optical artificial compound eyes

Duparré¹,

Wippermann²

2006

Bioinspir. Biomim.

155

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Natural compound eyes combine small eye volumes with a large field of view at the cost of comparatively low spatial resolution. For small invertebrates such as flies or moths, compound eyes are the perfectly adapted solution to obtaining sufficient visual information about their environment without overloading their brains with the necessary image processing. However, to date little effort has been made to adopt this principle in optics. Classical imaging always had its archetype in natural single aperture eyes which, for example, human vision is based on. But a high-resolution image is not always required. Often the focus is on very compact, robust and cheap vision systems. The main question is consequently: what is the better approach for extremely miniaturized imaging systems—just scaling of classical lens designs or being inspired by alternative imaging principles evolved by nature in the case of small insects? In this paper, it is shown that such optical systems can be achieved using state-of-the-art micro-optics technology. This enables the generation of highly precise and uniform microlens arrays and their accurate alignment to the subsequent optics-, spacing- and optoelectronics structures. The results are thin, simple and monolithic imaging devices with a high accuracy of photolithography. Two different artificial compound eye concepts for compact vision systems have been investigated in detail: the artificial apposition compound eye and the cluster eye. Novel optical design methods and characterization tools were developed to allow the layout and experimental testing of the planar micro-optical imaging systems, which were fabricated for the first time by micro-optics technology. The artificial apposition compound eye can be considered as a simple imaging optical sensor while the cluster eye is capable of becoming a valid alternative to classical bulk objectives but is much more complex than the first system.

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Section: H Non-sequential Raytracing Analysis Of Cleymentioning

confidence: 98%

Section: State Of the Art Of Man-made Vision Systemsmentioning

confidence: 99%

Micro-optical artificial compound eyes

Duparré¹,

Wippermann²

2006

Bioinspir. Biomim.

155

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“…10 The imaging capabilities of microlenslet arrays for either grayscale or color images were previously investigated, and it was demonstrated that 1:1 compact relays for such images could be conceived with OAL of less than 7mm. 11 The two key challenges when imaging with multi-aperture stacks of microlenslet arrays are the formation of ghost images in the system and lensletization. 11 The formation of ghost images in a multi-aperture imaging system comprising of a stack of microlenslet arrays is caused by the light emitted from the object in all directions taking more than one optical path through the system.…”

Section: Key Challenges In Imaging With Microlenslet Arraysmentioning

confidence: 99%

Magnifying miniature displays with microlenslet arrays

Shaoulov

Martins

Rolland

2004

Helmet- And Head-Mounted Displays IX: Technologies and Applications

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Current technology trends are focused on miniaturizing displays, although for specific applications such as the use of head-mounted displays (HMD) this limits the advancements for a wider field-of-view (FOV) and a negligible overall weight of the optics. Due to the advancements of electronics that benefit from smaller miniature displays, universities and companies are focused on developing this technology to meet the growing demand of this global market. Higher resolution displays with added brightness are being developed, but these displays are decreasing in their viewable area. HMDs can benefit from these higher resolution and brighter displays but they will undergo an increased optical weight to compensate for the smaller display size. To overcome this hindrance in HMDs, we demonstrate in this paper how to incorporate microlenslet arrays as an optical relay system to magnify miniature displays. Microlenslet arrays provide respectively shorter focal length which yields a smaller overall object to image distance and an incremental overall weight compared to an otherwise increased optical lens assembly. The contribution of this paper is a patented concept of magnifying/demagnifying miniature displays with microlenslet arrays that can be integrated in a spaced limited area.

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“…In addition, enough overlap among the sub-fields of view of each microlenslet pair was secured to minimize the lensletization. 9 The final optical layout of the investigated system is shown in Fig. 3 …”

Section: Optical Layout Of Microlenslet-array Based Magnifying Systemmentioning

confidence: 99%

“…In the case of grayscale images, image quality may be assessed subjectively as well as with more sophisticated quantitative approaches. 9 The optical layout of a 1:2 system using two arrays of each 9 by 9 microlenses, combined with an associated baffle located at the entrance pupil of the system is shown in Fig 4. Moreover, each lens in the first array was an F/5 square plano-convex lens, of 0.15mm thickness, and 500µm focal length. Each lens in the second array was an F/8.3 square plano-convex lens, of 0.15mm thickness, and 1000µm focal length.…”

Section: Theoretical Modelingmentioning

confidence: 99%