JP 2023-033114 A, Example 1 — Masaru Yonezawa, Shinkichi Ikeda, Takashi Kunugise, Masanao Kawana
| 15 ELEMENTS / 12 GROUPS |
| DESIGN f = 18.5444-116.8236 mm |
| DESIGN F/4.04-4.11 |
| 3 ASPHERICAL ELEMENTS / 6 ASPHERICAL SURFACES |
| INNER FOCUS / POWER ZOOM |
Single-group inner focus. G4 (L41-L42) moves imageward while D19 + D22 remains 23.060 mm. The tele middle keyframe preserves the patent-published near row. The matching wide middle keyframe and the 0.6 m endpoints are mechanism-constrained reconstructions solved against the air-equivalent image plane.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | 923209 class (supplier unresolved) |
| L12 | Plano-Convex Positive | 593686 class (supplier unresolved) |
| L13 | Positive Meniscus | 775503 class (H-LaK77 catalog equivalent; supplier unresolved) |
| L21 | Negative Meniscus (2x Asph) | 806407 class (supplier unresolved) |
| L22 | Biconcave Negative | 775503 class (H-LaK77 catalog equivalent; supplier unresolved) |
| L23 | Biconvex Positive | 847238 class (supplier unresolved) |
| L24 | Negative Meniscus | 883408 class (supplier unresolved) |
| L31 | Biconvex Positive (2x Asph) | S-FPL51 (catalog proxy for nd=1.49648, vd=81.26; supplier unresolved) |
| L32 | Negative Meniscus | 911353 class (supplier unresolved) |
| L33 | Biconvex Positive | 538747 class (supplier unresolved) |
| L41 | Positive Meniscus | 902253 class (supplier unresolved) |
| L42 | Biconcave Negative | 788475 class (supplier unresolved) |
| L51 | Positive Meniscus (2x Asph) | 583595 class (supplier unresolved) |
| L52 | Negative Meniscus | 001255 class (supplier unresolved) |
| L53 | Positive Meniscus | 532489 class (supplier unresolved) |