US 2014/0098253 A1 — Satoshi Maetaki
| 12 ELEMENTS / 9 GROUPS |
| 11-22mm f/4-5.6 MARKETED |
| 11.0037-22.0132mm COMPUTED DESIGN |
| 2 ASPHERICAL ELEMENTS / 3 ASPHERICAL SURFACES |
| LATERAL IS UNIT / REAR FOCUS |
| CONSTRAINED 0.15m FOCUS RECONSTRUCTION |
CONSTRAINED_RECONSTRUCTION: patent infinity zoom states retained; only U3 (authored L10; surfaces 18-19) translates for focus. At Canon's 0.15 m focal-plane-to-subject MFD, code-solved U3 imageward travel is 1.449509 / 2.180303 / 3.466319 mm at 11 / 15.5 / 22 mm, with D17 + D19 = 7.08 mm conserved. Close spacings are modeled, not patent-published.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (2× Asph) | 583594 crown class (vendor unresolved) |
| L2 | Biconcave Negative | 773496 lanthanum-flint class (vendor unresolved) |
| L3 | Biconvex Positive | 911353 high-index lanthanum-flint class (vendor unresolved) |
| L4 | Positive Meniscus | 697555 lanthanum-crown class (vendor unresolved) |
| L5 | Biconvex Positive | 517524 crown class (vendor unresolved) |
| L6 | Biconcave Negative | 883408 lanthanum-dense-flint class (vendor unresolved) |
| L7 | Biconvex Positive | 532488 light-flint class (vendor unresolved) |
| L8 | Biconvex Positive | 497815 high-Abbe ED/UD class (vendor unresolved) |
| L9 | Neg. Meniscus (1× Asph) | 854404 low-Tg lanthanum class (vendor unresolved) |
| L10 | Negative Meniscus | 834372 lanthanum-flint class (vendor unresolved) |
| L11 | Biconvex Positive | 626357 flint class (vendor unresolved) |
| L12 | Negative Meniscus | 835427 lanthanum-dense-flint class (vendor unresolved) |