US 3,856,386 A — Yoshisato Fujioka
| 11 ELEMENTS / 9 GROUPS |
| DESIGN f = 20.00 mm |
| DESIGN F/3.3 |
| ALL SPHERICAL |
| INFINITY-ONLY MODEL |
NO_INTERNAL_RECONSTRUCTION: the patent publishes one infinity-focus prescription and no focusing data, so no focus movement is modeled. 0.3 m is the marketed minimum focus distance, not a modeled state.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | K-LaK10 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L2 | Negative Meniscus | S-LAM3 (OHARA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L3 | Biconvex Positive | K-LaK14 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L4 | Negative Meniscus | K-LaK10 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L5 | Biconcave Negative | BASF7 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L6 | Biconvex Positive | SF5 (SCHOTT; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L7 | Biconvex Positive | BASF3 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L8 | Biconcave Negative | FD3 (HOYA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L9 | Biconvex Positive | S-TIL25 (OHARA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L10 | Positive Meniscus | K-LaK9 (SUMITA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |
| L11 | Positive Meniscus | LACL60 (HOYA; modern coordinate equivalent of the 1974 patent glass; supplier unconfirmed) |