JP 2019-023693 A — Masakazu Hibino
| 14 ELEMENTS / 10 GROUPS |
| DESIGN f = 44.10 mm |
| DESIGN F/1.28 |
| 1 ASPHERICAL SURFACE / 1 ELEMENT |
| PUBLISHED INNER FOCUS, THREE STATES |
PUBLISHED infinity, 1:40 and 0.5 m states (patent Example 1, variable-gap table). Inner focus: only the negative element L10 (G3) moves, 1.21 mm and 5.25 mm toward the image at the two printed near states, where the object is 1840 mm and 500 mm from the image plane; every other gap, the stop and the image plane stay fixed. The 0.5 m state matches the marketed minimum focus distance. Positions between the printed states are interpolated, and the iris is held at its infinity setting (the patent prints F1.30 and F1.34 for the near states).
| Element | Type | Glass |
|---|---|---|
| L1 | Plano-Convex | S-LAH98 (OHARA, coordinate equivalent) |
| L2 | Positive Meniscus | E-FDS1 (HOYA, coordinate equivalent) |
| L3 | Negative Meniscus | E-FD2 (HOYA, coordinate equivalent) |
| L4 | Biconcave Negative | FF8 (HOYA, coordinate equivalent) |
| L5 | Biconvex Positive (1× Asph) | M-TAFD305 (HOYA, coordinate equivalent) |
| L6 | Biconvex Positive | FCD515 (HOYA, coordinate equivalent) |
| L7 | Biconcave Negative | S-NBH56 (OHARA, coordinate equivalent) |
| L8 | Biconvex Positive | TAFD32 (HOYA, coordinate equivalent) |
| L9 | Biconvex Positive | E-FDS1 (HOYA, coordinate equivalent) |
| L10 | Negative Meniscus | E-FL6 (HOYA, coordinate equivalent) |
| L11 | Biconvex Positive | E-FDS1 (HOYA, coordinate equivalent) |
| L12 | Biconvex Positive | TAFD32 (HOYA, coordinate equivalent) |
| L13 | Biconcave Negative | FD225 (HOYA, coordinate equivalent) |
| L14 | Positive Meniscus | TAFD32 (HOYA, coordinate equivalent) |