S-FPM5
An optical glass for polished lenses with a Δn/ΔT that is close to zero.
S-FPM5 is a glass material with a Δn / ΔT closer to zero than conventional FP-based glass materials and is expected to effectively correct refractive index fluctuations (temperature drift) due to temperature changes. In addition, it has a high partial dispersion ratio θg, F, which is a characteristic of FP-based glass materials and is effective for correcting secondary chromatic aberration. This glass material can be used, not only for in-vehicle camera lenses, but also for other applications such as projector and interchangeable lenses.
Advantages
- Correct temperature drift
- Effective when cemented with a lanthanum material lens
- Effective for correcting secondary chromatic aberration
| S-FPM5 (New product) | ||
| Classification of environmental measures | Environmentally safe | |
| Refractive index nd | 1.55200 | |
| Abbe number vd | 70.70 | |
| Δn/ΔT relative D line 40～60℃ | -2.8 | |
| Partial dispersion ratio θg,F | 0.5421 | |
| Abnormal dispersibility ⊿θg,F | 0.015 | |
| CTE α (10 -7 /℃) | -30 ~ +70°C | 109 |
| +100 ~ +300°C | 129 | |
| Transition point Tg (℃) | 474 | |
| Yield point At (℃) | 503 | |
| Coloring degree | λ 80 | 345 |
| λ 5 | – | |
| Chemical durability | RW (P) | 1 |
| RA(P) | 2 | |
| W(S) | 1 | |
| SR | 52.1 | |
| PR | 4.0 | |
| Specific Gravity | 3.74 | |
| Knoop hardness Hk | 410 (4) | |
| Abrasion degree Aa | 413 | |
| Catalog data details |  |
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| Available Shapes | ・Pressings ・Polished Preforms ・Polished Lenses ・Aspherical Glass Mold Lenses | |
