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S-FPM5 |
An optical glass for polished lenses with a Δn/ΔT that is close to zero.
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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
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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 |
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