Zoom lens design using lens modules

Park, Sung Chan; Shannon, Robert R.

doi:10.1117/1.600742

Cited by 45 publications

(23 citation statements)

References 3 publications

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“…In order to get an initial zoom system, we optimized the lens module parameters so that the specific constraints were satisfied [12]. In Table 1 of the previous section, the thickness of each group and the air spaces are not presented.…”

Section: Initial Design For An 8x Four-group Zoom Lensmentioning

confidence: 99%

“…For the initial design of an 8x four-group innerfocus zoom system, we input the proper distances between principal points and the targeted total powers at the wide and the tele positions. These starting values are empirically selected to satisfy the following basic requirements for an 8x compact zoom system: (12) By inputting these starting values for Eq. (12) into the program tool, we can immediately obtain the power of each group, as shown in Fig.…”

Section: Paraxial Design Of An 8x Four-group Inner-focus Zoom Symentioning

confidence: 99%

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Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

Lee

Park

2016

Journal of the Optical Society of Korea

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This study presents an 8x four-group inner-focus zoom lens with one-moving group for a compact camera by use of a focus tunable lens (FTL). In the initial design stage, we obtained the powers of lens groups by paraxial design based on thin lens theory, and then set up the zoom system composed of four lens modules. Instead of numerically analytic analysis for the zoom locus, we suggest simple analysis for that using lens modules optimized. After replacing four groups with equivalent thick lens modules, the power of the fourth group, which includes a focus tunable lens, is designed to be changed to fix the image plane at all positions. From this design process, we can realize an 8x four-group zoom system having one moving group by employing a focus tunable lens. The final designed zoom lens has focal lengths of 4 mm to 32 mm and apertures of F/3.5 to F/4.5 at wide and tele positions, respectively.

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Section: Initial Design For An 8x Four-group Zoom Lensmentioning

confidence: 99%

Section: Paraxial Design Of An 8x Four-group Inner-focus Zoom Symentioning

confidence: 99%

Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

Lee

Park

2016

Journal of the Optical Society of Korea

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“…For the real lens system to be equivalent to the thicklens module to within the limit of the first-and thirdorder properties, all the first-order quantities and all the third-order aberrations of the real lens should be equal to those of the lens module: A conversion method from lens module to the real lens has been reported [8]. However, it is very complicated to handle analytically all the first-order quantities and the third-order aberrations at the same time.…”

Section: Back Focal Lengthmentioning

confidence: 99%

“…In other words, if the first-order quantities and the third-order aberrations of the lens module are assigned to the real lens group, then both lens systems are equivalent to each other to within the limit of the first-and the third-order properties. Hence, each group of the zoom system can be replaced by its thick lens module by specifying its focal length(FLM), front focal length(FFM), back focal length(BFM), magnification (MGM), entrance pupil position(EPM), entrance pupil diameter(EDM), field angle(β), and third-order aberrations [7][8][9].…”

Section: Initial Zoom Lens Designmentioning

confidence: 99%

“…The focal length (f), the front focal length(ffl), the back focal length(bfl), the magnification(M) at a given conjugate, and the third-order Seidel aberration coefficients for spherical aberration (SI), coma (SII), astigmatism (SIII), Petzval curves (SIV), and distortion (SV) of this system are expressed in terms of Gaussian brackets as [8,[11][12] Focal length :…”

Section: Converting Lens Modules Into Real Lens Groupsmentioning

confidence: 99%

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Compact Zoom Lens Design for a 5x Mobile Camera Using Prism

Park¹,

Lee²,

Kim³

2009

Journal of the Optical Society of Korea

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This study presents the compact zoom lens with a zoom ratio of 5x for a mobile camera by using a prism. The lens modules and aberrations are applied to the initial design for a four-group inner-focus zoom system. An initial design with a focal length range of 4.4 to 22.0 mm is derived by assigning the first-order quantities and third-order aberrations to each module along with the constraints required for optimum solutions. We separately designed a real lens for each group and then combined them to establish an actual zoom system. The combination of the separately designed groups results in a system that satisfies the basic properties of the zoom system consisting of the original lens modules. In order to have a slim system, we directly inserted the right-angle prism in front of the first group. This configuration resulted in a more compact zoom system with a depth of 8 mm. The finally designed zoom lens has an f-number of 3.5 to 4.5 and is expected to fulfill the requirements for a slim mobile zoom camera having high zoom ratio of 5x.

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Design of novel deformable mirror with large displacement

Li,

Tian,

Wang

et al. 2023

Concurrency and Computation

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SummaryA stabilized zoom system with deformable mirrors (DMs) was designed for continuous optical zoom. In order to adjust the focal length and expand the field angle, the characteristic surface shapes of the DMs composed of the low‐order and high‐order Zernike polynomials were provided. The maximum peak‐to‐valley (PV) value at the center of the surface shape is 80 μm. This work presents a piezoelectrically‐actuated deformable mirror (PADM) with large displacement for a stabilized zoom system. The COMSOL simulation was conducted to obtain the desired design by matching and optimizing structural parameters. The maximum displacement of PADM was more than 80 μm. The fitting results by the steepest descent algorithm (SD) showed that the RMS values of the residual surface shapes were 1 of 7 to 1 of 4 of their PV values, and the PV values of the residual surface shapes were less than 1 of 10 of the PV values of the target surface shapes.

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Zoom lens design using lens modules

Cited by 45 publications

References 3 publications

Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

Compact Zoom Lens Design for a 5x Mobile Camera Using Prism

Design of novel deformable mirror with large displacement

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