US 2011/0170195 A1 — Mami Muratani, Issei Tanaka
| PATENT: 9 ELEMENTS / 8 GROUPS |
| PRODUCTION: 9 ELEMENTS / 7 GROUPS |
| 40 mm MARKETED / 40.001 mm MODELED |
| f/2.8 MARKETED / f/2.68 MODELED |
| 38°50′ MARKETED / 39.0° PATENT FIELD |
| 1 ASPHERICAL SURFACE / 1:1 PUBLISHED CLOSE STATE |
PUBLISHED: Example 1 supplies INF, β=-0.5 MID, and β=-1.0 CLD states. G1 and G2 move objectward while d1a changes; the stop co-moves with G2, d1b stays 4.00000 mm, and G3 remains fixed to the physical image plane. Runtime focus uses one linear parameter between the published INF/CLD endpoints, so the published MID d1a/d2 pair is verified separately and is not represented exactly by the runtime interpolation. The modeled CLD conjugate is 0.15264661 m object-to-physical-focal-plane, while closeFocusM retains Nikon's separate 0.163 m marketed minimum-focus specification.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus (concave to image) | FK5 (SUMITA catalog equivalent; production supplier unspecified) |
| L12 | Biconvex Positive | NBFD13 (HOYA catalog correlation; patent vendor unspecified) |
| L13 | Biconvex Positive | BACD4 (HOYA catalog correlation; patent vendor unspecified) |
| L14 | Biconcave Negative | F3 (SUMITA catalog equivalent; production supplier unspecified) |
| L21 | Biconcave Negative | F3 (SUMITA catalog equivalent; production supplier unspecified) |
| L22 | Biconvex Positive | N-SK16 (SCHOTT catalog equivalent; production supplier unspecified) |
| L23 | Biconvex Positive (rear asphere) | M-PCD4 (HOYA catalog correlation; patent vendor unspecified) |
| L31 | Negative Meniscus (concave to image) | FK5 (SUMITA catalog equivalent; production supplier unspecified) |
| L32 | Positive Meniscus (concave to object) | J-LAF2 (HIKARI catalog equivalent; production supplier unspecified) |