Grigoriy I. Greisukh, Evgeniy G. Ezhov, Alexander V. Kalashnikov, and Sergei A. Stepanov, "Diffractive–refractive correction units for plastic compact zoom lenses," Appl. Opt. 51, 4597-4604 (2012)
A method of designing a plastic zoom lens with a diffractive–refractive hybrid corrector, comprising one diffractive lens and one refractive lens, is described. The efficiency of this method is demonstrated by designing a compact zoom lens for a mobile phone. This zoom design, incorporating lenses made only of two commercial optical plastics (polymethylmethacrylate and polycarbonate), provides high optical performance.
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Thickness for wide-angle configuration is 4.24 mm; for middle, 2.71 mm; for telephoto, 0.79 mm.
Diffraction order and diffractive-lens phase coefficients: ; ; ; ; ; ; ; ; .
Thickness for wide-angle, 0.67 mm; for middle, 2.86 mm; for telephoto, 5.08 mm.
Thickness for wide-angle, 1.85 mm; for middle, 1.19 mm; for telephoto, 0.89 mm.
Table 3.
Design Specification of Designed Plastic Zoom Lens
Configuration
Design Specification
Wide Angle
Middle
Telephoto
EFL (mm)
3.44
5.17
8.17
-number
3.0
4.2
5.5
Field angle, (deg)
73.2
50.4
34.5
Image size, (mm)
5
Total length, (mm)
12.4
Diffraction-limited chromatic shift range, (μm)
21.3
41.4
70.2
Ratio of lateral color to Airy disk radius
0.5
1.2
1
Polychromatic resolution (cycles/mm):
62
65
67
140
Distortion (%)
3
2.6
1.2
Table 4.
Diffractive Parameters of Designed Plastic Zoom Lens
Parameter
Specification
Diameter (mm)
1.6
Total number of Fresnel zones
20
Focal length at wavelength (mm)
32.25
Minimum zone width (μm)
18.4
Tables (4)
Table 1.
Refractive Index and Abbe Number of Commercial Optical Plastics [11]
Thickness for wide-angle configuration is 4.24 mm; for middle, 2.71 mm; for telephoto, 0.79 mm.
Diffraction order and diffractive-lens phase coefficients: ; ; ; ; ; ; ; ; .
Thickness for wide-angle, 0.67 mm; for middle, 2.86 mm; for telephoto, 5.08 mm.
Thickness for wide-angle, 1.85 mm; for middle, 1.19 mm; for telephoto, 0.89 mm.
Table 3.
Design Specification of Designed Plastic Zoom Lens
Configuration
Design Specification
Wide Angle
Middle
Telephoto
EFL (mm)
3.44
5.17
8.17
-number
3.0
4.2
5.5
Field angle, (deg)
73.2
50.4
34.5
Image size, (mm)
5
Total length, (mm)
12.4
Diffraction-limited chromatic shift range, (μm)
21.3
41.4
70.2
Ratio of lateral color to Airy disk radius
0.5
1.2
1
Polychromatic resolution (cycles/mm):
62
65
67
140
Distortion (%)
3
2.6
1.2
Table 4.
Diffractive Parameters of Designed Plastic Zoom Lens