JP 2021-096331 A, Numerical Example 5 — Yuki Kubota, Yasuharu Yamada
| 21 ELEMENTS / 14 GROUPS |
| DESIGN f = 153.00–391.96 mm |
| DESIGN F/4.59 |
| 2 ASPHERICAL SURFACES / 1 ELEMENT |
| 28 ELEMENTS / 18 GROUPS WITH BUILT-IN CONVERTER |
G4 (L12/L13) moves imageward for near focus; during zoom it first moves imageward then objectward. The patent prints three infinity zoom states; the 98 intermediate zoom positions and the 1.3 m close-focus state are reconstructed. Both converter configurations share the front geometry at infinity, with close-focus travel solved separately. D19+D22 remains constant. Image stabilization is modelled centred; finite-focus MTF is unavailable.
| Element | Type | Glass |
|---|---|---|
| L1 | Plano-Convex Positive | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L2 | Negative Meniscus | S-NBH52V (OHARA catalog equivalent; production supplier unspecified) |
| L3 | Positive Meniscus | S-FPL55 (OHARA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | S-NBH56 (OHARA catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L6 | Positive Meniscus | S-TIH11 (OHARA catalog equivalent; production supplier unspecified) |
| L7 | Biconcave Negative | S-LAH64 (OHARA catalog equivalent; production supplier unspecified) |
| L8 | Biconvex Positive (2× Aspheric) | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L9 | Plano-Concave Negative | S-TIH53 (OHARA catalog equivalent; production supplier unspecified) |
| L10 | Biconvex Positive | S-FPL55 (OHARA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | S-FPL55 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Negative Meniscus | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| L13 | Positive Meniscus | S-NBH56 (OHARA catalog equivalent; production supplier unspecified) |
| L14 | Negative Meniscus | S-FTM16 (OHARA catalog equivalent; production supplier unspecified) |
| L15 | Biconvex Positive | S-FPL55 (OHARA catalog equivalent; production supplier unspecified) |
| L16 | Biconvex Positive | S-NBH56 (OHARA catalog equivalent; production supplier unspecified) |
| L17 | Biconcave Negative | FCD515 (HOYA catalog equivalent; production supplier unspecified) |
| L18 | Biconcave Negative | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| L19 | Biconvex Positive | S-LAM55 (OHARA catalog equivalent; production supplier unspecified) |
| L20 | Biconvex Positive | S-NBH57 (OHARA catalog equivalent; production supplier unspecified) |
| L21 | Plano-Concave Negative | FDS18 (HOYA catalog equivalent; production supplier unspecified) |