JP 2024-066164 A — Yasuharu Yamada
| 18 ELEMENTS / 13 GROUPS |
| DESIGN f = 88.21 mm |
| DESIGN F/3.64 |
| ALL SPHERICAL |
| FOCUS TO 2× (PATENT) |
PUBLISHED: the patent prints four states (infinity, 0.5×, 1× and 2×). G2 moves toward the image and G3 toward the object as focus closes. Distance labels are derived from the paraxial magnification of each printed state, not from printed object distances; between the printed states the gaps are interpolated linearly, which is not a verified focus cam. The iris is sized at infinity and held fixed, so the patent's finite-state f-numbers are not imposed. At 1× and 2× some analysis panels trace few rays or fall back to collimated light.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-FSL5 |
| L2 | Biconvex Positive | FCD515 |
| L3 | Biconvex Positive | FCD515 |
| L4 | Negative Meniscus | TAFD55 |
| L5 | Biconvex Positive | S-FPL55 |
| L6 | Positive Meniscus | S-TIH53 |
| L7 | Biconcave Negative | S-LAL14 |
| L8 | Biconcave Negative | S-FPL51 |
| L9 | Negative Meniscus | S-NBH58 |
| L10 | Biconvex Positive | S-FPL55 |
| L11 | Biconvex Positive | FCD1 |
| L12 | Biconcave Negative | S-NSL36 |
| L13 | Biconvex Positive | S-NBH56 |
| L14 | Biconcave Negative | S-BAL12 |
| L15 | Biconcave Negative | S-TIM2 |
| L16 | Biconvex Positive | TAFD37 |
| L17 | Biconvex Positive | S-BAL35 |
| L18 | Biconcave Negative | S-NBH58 |