JP 2015-166834 A — Masaharu Hosoi
| 12 ELEMENTS / 10 GROUPS |
| PATENT f = 16.48 / 24.07 / 33.95 mm |
| DESIGN FNO = 4.07 / 4.08 / 4.09 |
| PATENT 2ω = 108.08° / 83.10° / 63.60° |
| 8 ASPHERICAL SURFACES |
CONSTRAINED_RECONSTRUCTION: the patent moves GR3 alone for focus. Close-focus D15/D17 pairs were solved at Sony's 0.28 m subject-to-image-plane MFD while conserving D15+D17; these close states are model-derived, not patent-published.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus (2× Asph) | M-TAF1 (HOYA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L12g | Negative Meniscus Substrate | Unmatched (mixed-coordinate patent row; 835427 class) |
| L12r | Bonded Aspheric Resin Layer | Unmatched (aspheric resin, patent-only optical constants) |
| L13 | Negative Meniscus | Unmatched (mixed-coordinate patent row; 804466 class) |
| L14 | Biconvex Positive | Unmatched (mixed-coordinate patent row; 001291 dense-flint class) |
| L21 | Positive Meniscus | BAC4 (HOYA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L22 | Negative Meniscus (1× Asph) | Unmatched (mixed-coordinate patent row; 74349x lanthanum class) |
| L23 | Positive Meniscus | S-FPL51 (OHARA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L31 | Biconvex Positive (2× Asph) | J-FK5 (HIKARI catalog-equivalent coefficient proxy; production supplier unspecified) |
| L41 | Negative Meniscus | Unmatched (mixed-coordinate patent row; 804466 class) |
| L42 | Positive Meniscus | S-FPL51 (OHARA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L43 | Biconvex Positive | S-FPL51 (OHARA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L44 | Biconcave Negative (2× Asph) | Unmatched (mixed-coordinate patent row; 774472 lanthanum-flint class) |