JP 2020-173349 A — Maki Yokoya, Tomohiro Ino
| 10 ELEMENTS / 7 GROUPS |
| 600mm f/11 (MARKETED) |
| EXAMPLE 1: 581.65mm f/11.31 |
| S2 DIFFRACTIVE PHASE SURFACE |
| OBJECTWARD SINGLE-ELEMENT INNER FOCUS |
CONSTRAINED_RECONSTRUCTION: inner focus by the single positive L2 element (S6-S7), moving objectward toward close focus. The patent's raw infinity d5/d7=16.25/22.19 mm is internally inconsistent; the authored infinity base is the disclosed source-precision 18.44/20.00 mm solution under d5+d7=38.44 mm. The close endpoint is the published 3.50/34.94 mm row and computes about 4.49474 m object-to-image distance.
| Element | Type | Glass |
|---|---|---|
| E1 | Biconvex Positive | 487702 patent coordinate; S-FSL5 catalog spectral proxy (production supplier unspecified) |
| E2 | Biconcave Negative | 596392 patent coordinate; E-F8 catalog spectral proxy (production supplier unspecified) |
| E3 | Negative Meniscus | 835427 patent coordinate; S-LAH55 catalog spectral proxy (production supplier unspecified) |
| E4 | Plano-Convex Positive | 487702 patent coordinate; S-FSL5 catalog spectral proxy (production supplier unspecified) |
| E5 | Biconcave Negative | 900374 patent coordinate; TAFD37A catalog spectral proxy (production supplier unspecified) |
| E6 | Biconvex Positive | 654397 patent coordinate; N-KZFS5 catalog spectral proxy (production supplier unspecified) |
| E7 | Biconvex Positive | 654397 patent coordinate; N-KZFS5 catalog spectral proxy (production supplier unspecified) |
| E8 | Biconcave Negative | 593686 patent coordinate; FCD515 catalog spectral proxy (production supplier unspecified) |
| E9 | Biconcave Negative | 804465 patent coordinate; TAF3D catalog spectral proxy (production supplier unspecified) |
| E10 | Biconvex Positive | 596392 patent coordinate; E-F8 catalog spectral proxy (production supplier unspecified) |