JP 2022-131391 A, Numerical Example 5 — Shingo Abe
| 12 ELEMENTS / 11 GROUPS |
| DESIGN f = 20.60-38.80 mm |
| DESIGN F/2.91 |
| 5 ASPHERICAL SURFACES / 3 ELEMENTS |
| 4 LD ELEMENTS |
The patent prints infinity and 300 mm spacings at wide, middle and tele; those six states are exact. The intermediate zoom positions are an inferred reconstruction, not the factory cam: G4 is solved for infinity focus between the printed stations and the other groups follow interpolated laws. Between printed stations the near state is interpolated and is illustrative only. Tamron's minimum focus distance is 0.17 m at wide and 0.29 m at tele; the model's near state is the patent's 300 mm.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | TAC8 (HOYA catalog equivalent; production supplier unspecified) |
| L2 | Negative Meniscus | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L3 | Pos. Meniscus (1× Asph) | S-TIL25 (OHARA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | S-NBH57 (OHARA catalog equivalent; production supplier unspecified) |
| L5 | Negative Meniscus | S-LAL7 (OHARA catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive (2× Asph) | M-FCD1 (HOYA catalog equivalent; production supplier unspecified; molded aspherical element) |
| L7 | Negative Meniscus | E-FD15 (HOYA catalog equivalent; production supplier unspecified) |
| L8 | Biconvex Positive | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L9 | Biconcave Negative | FC5 (HOYA catalog equivalent; production supplier unspecified) |
| L10 | Biconvex Positive | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L11 | Biconcave Negative | FC5 (HOYA catalog equivalent; production supplier unspecified) |
| L12 | Neg. Meniscus (2× Asph) | M-LAC130 (HOYA catalog equivalent; production supplier unspecified; molded aspherical element) |