Disruptive advancement in precision lens mounting

Lamontagne, Frédéric; Desnoyers, Nichola; Doucet, Michel; Côté, Pascal; Gauvin, Jonny; Anctil, Geneviève

doi:10.1117/12.2196441

Cited by 4 publications

(5 citation statements)

References 1 publication

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“…For example, the spherical surface of a plano-convex lens will self-center against an annular retaining surface while the plano side will justify against the plane of a retaining ring or surface, and translate any wedge into a thickness uncertainty. For aspheric and biconvex or concave elements these assumptions do not hold and the tolerances may be looser or the mounting method may need to be more refined, i.e., an active alignment of the element in a cell or specialized retaining rings 31 . By mounting lenses in “poker chips” or cells, additional COTS optics can be used that have shorter radii of curvature and smaller mechanical diameters 32…”

Section: Method: a Workflow And Protocol For Off-the-shelf Lens Designsmentioning

confidence: 99%

“…For aspheric and biconvex or concave elements these assumptions do not hold and the tolerances may be looser or the mounting method may need to be more refined, i.e., an active alignment of the element in a cell or specialized retaining rings. 31 By mounting lenses in "poker chips" or cells, additional COTS optics can be used that have shorter radii of curvature and smaller mechanical diameters. 32 Figures 5 and 6 present a comparison of the modulation transfer function (MTF) performance at the 1-mm field coordinate for the global solution with an arbitrary shape factor and for the COTS substitution solution respectively.…”

Section: Method: a Workflow And Protocol For Off-the-shelf Lens Designsmentioning

confidence: 99%

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Global design of an off-the-shelf objective lens with no a priori design and macro-enabled optimization

Young¹

2022

Opt. Eng.

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. Synthesis of original optical designs is a challenging endeavor for novice lens designers. It is made more difficult when attempting to design a compound lens from off-the-shelf lenses. All but the simplest compound lenses resist ready analysis or understanding from a first-principles approach of geometric optics; however, many optical design packages include powerful optimization algorithms for both local and global searches. Despite the power of these tools, the initial construction of a starting lens and merit function remains crucial to the effective utilization of the optimizer. A workflow is presented for a generic starting design, construction of the merit function, and the optimization for a compound monochromatic objective lens composed only of commercial off-the-shelf lenses. A protocol is defined for the substitution of off-the-shelf lenses into a design with optical elements of arbitrary shape factor. Additionally, the theory and method for optimization of the shape factor via a macro in Zemax OpticStudio are provided to accelerate the substitution protocol and improve search results. The performance of the objective design is presented both before and after the off-the-shelf lens substitution and performance is compared to the design requirements. A tolerance analysis is performed and sensitivity and yield are discussed. The macro, lens design, merit function, and additional supporting code are provided.

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Section: Method: a Workflow And Protocol For Off-the-shelf Lens Designsmentioning

confidence: 99%

Section: Method: a Workflow And Protocol For Off-the-shelf Lens Designsmentioning

confidence: 99%

Global design of an off-the-shelf objective lens with no a priori design and macro-enabled optimization

Young¹

2022

Opt. Eng.

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“…It has been shown that very good centering accuracy, generally less than 5 µm, can be expected for an optical surface mounted directly on the barrel seat with the drop-in method [1]. On the other hand, poor centering is typical for the second optical surface and centering errors over 100 µm are common.…”

Section: Auto-centering Principlementioning

confidence: 98%

“…from[1] presents centering measurements for spherical convex lens surface in contact with a standard threaded ring. The centering error presented are directly related to the threaded ring decenter and tilt as described by equation 4.…”

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confidence: 99%

Lens auto-centering

et al. 2015

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In a typical optical system, optical elements usually need to be precisely positioned and aligned to perform the correct optical function. This positioning and alignment involves securing the optical element in a holder or mount. Proper centering of an optical element with respect to the holder is a delicate operation that generally requires tight manufacturing tolerances or active alignment, resulting in costly optical assemblies. To optimize optical performance and minimize manufacturing cost, there is a need for a lens mounting method that could relax manufacturing tolerance, reduce assembly time and provide high centering accuracy. This paper presents a patent pending lens mounting method developed at INO that can be compared to the drop-in technique for its simplicity while providing the level of accuracy close to that achievable with techniques using a centering machine (usually < 5 µm). This innovative auto-centering method is based on the use of geometrical relationship between the lens diameter, the lens radius of curvature and the thread angle of the retaining ring. The autocentering principle and centering test results performed on real optical assemblies are presented.In addition to the low assembly time, high centering accuracy, and environmental robustness, the INO auto-centering method has the advantage of relaxing lens and barrel bore diameter tolerances as well as lens wedge tolerances. The use of this novel lens mounting method significantly reduces manufacturing and assembly costs for high performance optical systems. Large volume productions would especially benefit from this advancement in precision lens mounting, potentially providing a drastic cost reduction.

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“…It has been shown that very good centering accuracy, generally <0.3 arc min, can be expected for a spherical optical surface mounted directly on a barrel seat with the drop-in method. 5 On the other hand, centering error as high as 5 arc min has been observed for the second optical surface centered using surface-contact mounting with standard threaded ring. In such cases, the centering error of the lens surface in contact with the threaded ring depends on the positioning errors of the ring lens seat.…”

Section: Aspheric Lens Autocenteringmentioning

confidence: 99%

Aspheric lens mounting

Lamontagne¹,

Fuchs²,

Trabert³

et al. 2018

Opt. Eng.

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Mounting aspheres is often challenging because of the higher sensitivity to decenter and tilt compared with spherical lenses. This paper first describes aspheric surface decenter and tilt error as per ISO 10110 standard. Then, the most common lens mounting and alignment method for aspheric lenses are discussed in detail. Finally, an innovative mounting method that uses surface contact mounting is presented. This autocentering method uses the optical surfaces as mounting interfaces to provide a high level of centering accuracy for aspheric lenses. Centering measurement results for different aspheric lenses mounted using this method are also presented. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Disruptive advancement in precision lens mounting

Cited by 4 publications

References 1 publication

Global design of an off-the-shelf objective lens with no a priori design and macro-enabled optimization

Global design of an off-the-shelf objective lens with no a priori design and macro-enabled optimization

Lens auto-centering

Aspheric lens mounting

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