The tolerance analysis of wide-angle lens

Huang, Kuang-Lung

doi:10.1117/12.569995

Cited by 8 publications

(4 citation statements)

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“…Once the design is optimized to satisfactory performance, we will move to second step. Typical industrial standard of tolerances has been input into the Monte-Carlo analysis [14][15]. The tolerances applied to the Monte-Carlo includes the lens surface profile fabrication error in micron or fringes, the lens front and back surface de-centre and tilt, the lens elements assembly tilt and de-centre error and lastly the lens material refractive index and Abbe…”

Section: Figurementioning

confidence: 99%

Self-image correction for low-cost imaging optic

Wang

Whitaker

2023

ETN

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With the advent of computing power and higher resolution CMOS sensor, imaging camera for mobile phone application has become very common in consumer portable product such as mobile phone, tablet or even wearable devices and head mount devices . Higher resolution image sensor, on the other hand, will suffer chromatic aberration (CA) where the colour channel appears shifted. Better lens design with more lens elements may be required. However, this will add more cost and manufacturing challenges. Many studies and methods have been proposed for CA correction through post image processing and those methods required calibration or post image process before correction factor can be applied. In this paper, we propose a new algorithm that will pre-defined the CA correction factor through lens design simulation.

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Section: Figurementioning

confidence: 99%

Self-image correction for low-cost imaging optic

Wang

Whitaker

2023

ETN

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“…For wide angle imaging systems, on which the front surface is generally large compared to the other lenses in the system, tolerance analysis can be more challenging and proper tolerances have to be specified to ensure that required performances are obtained. They are often very sensitive [1] and ray tracing errors are frequent in optical design programs at large field angles due to large entrance pupil shifts. This paper identifies another important difference in tolerancing panoramic systems.…”

Section: Introductionmentioning

confidence: 99%

Tolerancing panoramic lenses

Parent

Thibault

2009

SPIE Proceedings

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Tolerancing a lens is a basic procedure in lens design. It consists in first defining an appropriate set of tolerances for the lens, then in adding compensators with their allowable ranges and finally in selecting an appropriate quality criterion (MTF, RMS spot size, wavefront error, boresight error…) for the given application. The procedure is straightforward for standard optical systems. However, it becomes more complex when tolerancing very wide angle lenses (larger than 150 degrees). With a large field of view, issues such as severe off-axis pupil shift, considerable distortion and low relative illumination must be addressed. The pupil shift affects the raytrace as some rays can no longer be traced properly. For high resolution imagers, particularly for robotic and security applications, the image footprint is most critical in order to limit or avoid complex calibration procedures. We studied various wide angle lenses and concluded that most of the distortion comes from the front surface of the lens. Consequently, any variation of the front surface will greatly affect the image footprint. In this paper, we study the effects on the image footprint of slightly modifying the front surface of four different lenses: a simple double-gauss for comparison, a fisheye lens, a catadioptric system (omnidirectional lens) and a Panomorph lens. We also present a method to analyze variations of the image footprint. Our analysis shows that for wide angle lenses, on which the entrance pupil is much smaller than the front surface, irregularities (amplitude, slope and location) are critical on both aspherical and spherical front surfaces to predict the image footprint variation for high resolution cameras. Finally, we present how the entrance pupil varies (location, size) with the field of view for these optical systems.

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“…Rodgers [10] uses CODE V to analyze the tolerance of null lenses, and compares the results in practice and the design of the software. Huang [11] analyzes the manufacturing tolerance of a wide angle lens by the optical software Zemax, going through the Monte Carlo method to analyze the sensitivity of each element. The minimum decenter value is used to measure the experimental data and get the best possible results with the Taguchi method by Chen et al [12].…”

Section: Introductionmentioning

confidence: 99%

Tolerance reallocation of an optical zoom lens to meet multiperformance criteria

Sun

2014

Appl. Opt.

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This article demonstrates a method of tolerance reallocation via the Taguchi method for optical zoom lens design, which is based on the indicated specifications and corresponding tolerances derived from optical simulation in order to resolve the conventional dilemmas of performance between the modulation transfer function (MTF), relative illumination (RI), and distortion (DST) but also improve the performance without problems of tolerance. Generally speaking, the above refer to trade-offs between performance and tolerance of a kind which complicates modern optical design in high-quality products. In this paper, the Taguchi method of investigation was successfully adopted in seeking to balance MTF, DST, and RI so as to reallocate tolerance; therefore, we concluded that displays of multiperformance criteria can simultaneously give efficient help in tolerancing optimization in a way which approaches the exact manufacturing requirements. Without question, the proposed process could be copied when selecting other ways of evaluating image quality.

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The tolerance analysis of wide-angle lens

Cited by 8 publications

References 0 publications

Self-image correction for low-cost imaging optic

Self-image correction for low-cost imaging optic

Tolerancing panoramic lenses

Tolerance reallocation of an optical zoom lens to meet multiperformance criteria

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