US 2021/0132345 A1 — Takehiro Nishioka, Hisayuki Ii
| 22 ELEMENTS / 17 GROUPS |
| MODELED f = 72.46–193.02 mm |
| MODELED F/2.83263 WIDE |
| 1 ASPHERICAL ELEMENT / 2 SURFACES |
| 3 ED / 2 UED CLASS ELEMENTS |
NO_INTERNAL_RECONSTRUCTION: the patent publishes infinity-focus zoom states and only the directions of the two rear focus groups. G5/G6 close-focus trajectories are underdetermined, so the viewer retains the infinity-focus spacings at every focus setting.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus (convex to object) | 904313 — lanthanum dense-flint class (vendor unresolved) |
| L2 | Plano-Convex Positive (convex to object) | 497816 — ED fluorophosphate crown class (vendor unresolved) |
| L3 | Positive Meniscus (convex to object) | 437951 — UED fluorophosphate crown class (vendor unresolved) |
| L4 | Biconvex Positive | 606437 — barium-flint class (vendor unresolved) |
| L5 | Negative Meniscus (convex to object) | 697555 — lanthanum-crown class (vendor unresolved) |
| L6 | Biconcave Negative | 487704 — fluor-crown class (vendor unresolved) |
| L7 | Biconvex Positive | 904313 — lanthanum dense-flint class (vendor unresolved) |
| L8 | Biconcave Negative | 603607 — dense-crown class (vendor unresolved) |
| L9 | Biconvex Positive | 805396 — dense barium-flint class (vendor unresolved) |
| L10 | Positive Meniscus (convex to object) | 497816 — ED fluorophosphate crown class (vendor unresolved) |
| L11 | Positive Meniscus (convex to image) | 437951 — UED fluorophosphate crown class (vendor unresolved) |
| L12 | Biconcave Negative | 847238 — dense-flint class (vendor unresolved) |
| L13 | Negative Meniscus (convex to object) | 847238 — dense-flint class (vendor unresolved) |
| L14 | Positive Meniscus (convex to object) | 497816 — ED fluorophosphate crown class (vendor unresolved) |
| L15 | Biconvex Positive (2× Asph) | P-SK57Q1 (SCHOTT catalog-equivalent; production supplier unspecified) |
| L16 | Negative Meniscus (convex to image) | 694532 — lanthanum-crown class (vendor unresolved) |
| L17 | Positive Meniscus (convex to image) | 859300 — dense-flint class (vendor unresolved) |
| L18 | Plano-Convex Positive (convex to image) | 870200 — very dense-flint class (vendor unresolved) |
| L19 | Biconcave Negative | BASF7 (Sumita catalog-equivalent; supplier not identified) |
| L20 | Biconvex Positive | 847238 — dense-flint class (vendor unresolved) |
| L21 | Biconcave Negative | 847238 — dense-flint class (vendor unresolved) |
| L22 | Positive Meniscus (convex to object) | LAF3 (Hoya catalog-equivalent; supplier not identified) |