US 2024/0192475 A1 — Takahiro Kitada
| 14 ELEMENTS / 10 GROUPS |
| DESIGN f = 14.56–26.93 mm |
| DESIGN F/4.14–5.68 |
| 4 ASPHERICAL SURFACES / 2 ELEMENTS |
| INFINITY-ONLY MODEL |
NO_INTERNAL_RECONSTRUCTION. The patent prints three infinity-focus zoom stations (14.56, 19.80 and 26.93 mm) and only those are modeled, so the focus control moves nothing. The third group, the L11–L12 doublet, focuses toward the image for near objects, but no finite-focus spacings are printed. The 0.15 m minimum focus distance (0.5× at the long end) is Panasonic's marketed figure and is not modeled. Between the printed stations the zoom gaps are linearly interpolated; this is not a published cam, and the paraxial focus sits up to 0.67 mm off the printed image plane between the middle and long-end stations.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus, convex to object | N-LASF44 (SCHOTT; HOYA TAF3D shares the coordinate; supplier unconfirmed) |
| L2 | Negative Meniscus (2× Asph), convex to object | Unmatched (Panasonic moulding material 1.53380/55.6; no catalog row; line indices from US 2017/0059832 A1) |
| L3 | Biconcave Negative | FCD505 (HOYA; catalog dispersion formula gives the printed nd 1.59283; supplier unconfirmed) |
| L4 | Biconvex Positive | Unmatched (patent dense-flint class; nd 1.67196, nu 31.5) |
| L5 | Negative Meniscus, convex to object | Unmatched (patent high-index crown class; nd 1.77319, nu 49.6) |
| C1 | Optical Cement Layer | Optical cement (patent nd=1.56732, vd=42.8) |
| L6 | Biconvex Positive | Unmatched (patent high-index flint class; nd 1.70147, nu 40.9) |
| L7 | Biconcave Negative | S-LAH99 (OHARA; coordinate equivalent; supplier unconfirmed) |
| C2 | Optical Cement Layer | Optical cement (patent nd=1.56732, vd=42.8) |
| L8 | Biconvex Positive | FCD1 (HOYA; coordinate equivalent; supplier unconfirmed) |
| L9 | Biconvex Positive (2× Asph) | M-FCD500 (HOYA moulding glass; coordinate equivalent; supplier unconfirmed) |
| L10 | Positive Meniscus, convex to image | Unmatched (patent dense-flint class; nd 1.81012, nu 21.2) |
| L11 | Biconvex Positive | FDS18 (HOYA; coordinate equivalent; supplier unconfirmed) |
| C3 | Optical Cement Layer | Optical cement (patent nd=1.56732, vd=42.8) |
| L12 | Biconcave Negative | FDS24 (HOYA; coordinate equivalent; supplier unconfirmed) |
| L13 | Positive Meniscus, convex to image | FCD1 (HOYA; coordinate equivalent; supplier unconfirmed) |
| C4 | Optical Cement Layer | Optical cement (patent nd=1.56732, vd=42.8) |
| L14 | Negative Meniscus, convex to image | Unmatched (patent dense-flint class; nd 1.80309, nu 35.2) |