JP 2015-87681 A — Tatsuyuki Onozaki
| 17 PHYSICAL LENSES / 12 GROUPS |
| 28-45mm f/4.5 MARKETED |
| 28.699-43.874mm DESIGN |
| f/4.6 MODELED DESIGN APERTURE |
| 2 ED ELEMENTS |
| 2 HYBRID ASPHERICAL ELEMENTS / 2 ASPHERICAL SURFACES |
| CONSTRAINED G2a INNER-FOCUS RECONSTRUCTION |
CONSTRAINED_RECONSTRUCTION. Patent paragraph 0052 identifies positive G2a (L21-L23) as the focus group and states that it moves imageward, but publishes no close-focus spacing row. A code solve at the production 0.4 m MFD translates G2a imageward by 4.336536 / 4.352598 / 4.497008 mm at wide / middle / tele; d9 increases and d14 decreases equally, conserving the G2 envelope. The tele paraxial magnification is 0.206291x, consistent with the rounded marketed 0.21x. These close states are reconstructed, not patent-published.
| Element | Type | Glass |
|---|---|---|
| L11g | Negative Meniscus Substrate, convex to object | S-LAH66N (OHARA catalog model; supplier not established) |
| L11r | Bonded Hybrid Asphere Resin Layer | Unmatched (synthetic resin hybrid-asphere layer, nd=1.52972, vd=42.7) |
| L12 | Negative Meniscus, convex to object | S-LAH64 (OHARA catalog model; supplier not established) |
| L13 | Biconcave Negative | S-PHM53 (OHARA catalog model; supplier not established) |
| L14 | Biconvex Positive | S-TIL26 (OHARA catalog model; supplier not established) |
| L21 | Positive Meniscus, convex to object | S-TIL26 (OHARA catalog model; supplier not established) |
| L22 | Negative Meniscus, convex to object | S-NBH55 (OHARA catalog model; supplier not established) |
| L23 | Biconvex Positive | S-TIL25 (OHARA catalog model; supplier not established) |
| L24 | Biconvex Positive | S-FPL51 (OHARA catalog model; supplier not established) |
| L31 | Biconcave Negative | S-LAH55VS (OHARA catalog model; supplier not established) |
| L32 | Biconvex Positive | S-NBH 8 (OHARA catalog model; supplier not established) |
| L33 | Biconcave Negative | S-LAH60 (OHARA catalog model; supplier not established) |
| L34 | Positive Meniscus, convex to object | S-TIH 6 (OHARA catalog model; supplier not established) |
| L41 | Biconvex Positive | S-LAH60 (OHARA catalog model; supplier not established) |
| L42 | Biconcave Negative | S-LAH63Q (OHARA catalog model; supplier not established) |
| L43 | Biconvex Positive | S-FPL51 (OHARA catalog model; supplier not established) |
| L44r | Bonded Hybrid Asphere Resin Layer | Unmatched (synthetic resin hybrid-asphere layer, nd=1.52972, vd=42.7) |
| L44g | Biconcave Negative Substrate | S-LAH60 (OHARA catalog model; supplier not established) |
| L45 | Biconvex Positive | S-FSL 5 (OHARA catalog model; supplier not established) |