US 2021/0231927 A1, Example 3 — Daiki Kawamura, Michio Cho
| 12 elements / 9 groups |
| 1 aspherical element (2 aspherical surfaces) |
| 2 ED elements |
| Inner focus (G2 moves) |
| f = 49.549 mm FNo = 1.03 2ω = 31.4° |
Patent Example 3: G2 moves 4.441 mm toward the object; G1 and stop remain fixed. Source close focus is 0.700 m from object to the image plane, which the model reproduces with the sensor plate traced physically. Intermediate movement is interpolated.
| Element | Type | Glass |
|---|---|---|
| L1a | Biconcave Negative | S-TIL2 (catalog-compatible model; supplier unspecified) |
| L1b | Biconvex Positive | 593686 ED class; J-PSKH1 catalog spectral proxy (patent dPgF retained) |
| L1c | Positive Meniscus | 593686 ED class; J-PSKH1 catalog spectral proxy (patent dPgF retained) |
| L1d | Positive Meniscus | S-NPH3 (catalog-compatible model; supplier unspecified) |
| L1e | Positive Meniscus | TAF4 (HOYA) / N-LAF21 class (788475 lanthanum flint; catalog equivalent, supplier unspecified) |
| L1f | Negative Meniscus | 893204 NPH class; S-NPH4 catalog spectral proxy (production supplier unspecified) |
| L1g | Negative Meniscus | S-NPH1 (catalog-compatible model; supplier unspecified) |
| L2a | Neg. Meniscus (2× Asph) | NbF/SF (nd=1.689, νd=31.2) |
| L2b | Biconvex Positive | H-ZLaF68N (CDGM; its curve reproduces the patent's θgF) |
| L2c | Biconcave Negative | E-FD15 (HOYA) / SF15 class (699301 dense flint; exact coordinate, supplier unspecified) |
| L2d | Biconvex Positive | H-ZLaF68N (CDGM; its curve reproduces the patent's θgF) |
| L2e | Negative Meniscus | J-F2 (Hikari) / F2 class (620364 flint; exact coordinate, supplier unspecified) |