US 5,264,965 A, Embodiment 4 — Jun Hirakawa
| 13 ELEMENTS / 11 GROUPS |
| DESIGN f = 29.02–101.60 mm |
| DESIGN F/4.1–5.8 |
| ALL SPHERICAL |
| POWER ZOOM |
The patent states that group I moves approximately 5 mm to focus from infinity to 0.43 m at every focal length. Calculated focusing moves this group toward the object, with the other groups held at their zoom positions. Exact finite spacings are not tabulated; the model retains infinity-focus geometry throughout the zoom range.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | LAC14 (HOYA catalog equivalent; production supplier unspecified) |
| L2 | Negative Meniscus | TAF1 (HOYA catalog equivalent; production supplier unspecified) |
| L3 | Biconcave Negative | TAF1 (HOYA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | FDS90 (HOYA catalog equivalent; production supplier unspecified) |
| L5 | Biconvex Positive | PCD4 (HOYA catalog equivalent; production supplier unspecified) |
| L6 | Biconvex Positive | S-LAL8 (OHARA catalog equivalent; production supplier unspecified) |
| L7 | Biconcave Negative | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L8 | Positive Meniscus | FD60 (HOYA catalog equivalent; production supplier unspecified) |
| L9 | Biconcave Negative | S-LAH60 (OHARA catalog equivalent; production supplier unspecified) |
| L10 | Biconcave Negative | TAFD5F (HOYA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Biconvex Positive | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| L13 | Negative Meniscus | S-LAH65 (OHARA catalog equivalent; production supplier unspecified) |