S-LAM73 which has negative dn/dT at the region of LAM and is ideal for polished lenses of Automotive cameras.
10.30.2017
S-LAM73 is an optical glass which has negative dn/dT at the region of LAM.
Cars are used in environments where the temperature change is large from below zero (cold district) to more than 50 C (inside car in summer). In the optical system of Automotive camera lenses, it’s common that the focal length is fixed. Since many optical glasses have positive dn/dT, by combining these optical glasses with S-LAM73, it is expected that refractive index fluctuations due to temperature change can be adjusted efficiently. In addition, S-LAM73 can be used for not only Automotive camera lenses but also projectors, photographic interchangeable lenses and various applications.
(Advantages)
1.Negative dn/dT at the region of LAM
dn/dT(Dline 40℃~60℃) -0.8
2.The highest refractive index among glasses with negative dn/dT at the region of low dispersion
nd approximately 1.8
(Until now S-LAL20 had the highest nd. The nd value is approximately 1.7)
| S-LAM73 | ||
| Eco Optical Glass | ○ | |
| Refractive Index nd | 1.79360 | |
| Abbe Number νd | 37.09 | |
| dn/dT relative D line 40～60℃ |
-0.8 | |
| CTE α (10-7/℃) |
-30～70℃ | 89 |
| +100～300℃ | 105 | |
| Transformation Point Tg(°C) | 623 | |
| Yield Point At(°C) | 658 | |
| Coloring | λ80 | 415 |
| λ5 | 350 | |
| Chemical Resistance | RW(P) | 1 |
| RA(P) | 4 | |
| W(S) | 3 | |
| SR | 52.2 | |
| PR | 2.2 | |
| Specific Gravity | 4.45 | |
| Knoop Hardness Hk | 570[6] | |
| Abrasion Aa | 182 | |
| Detail Catalog DATA | ||
| Available shapes | •pressing •saw cut center-less ground cylindrical blanks •cut blanks |
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Please consult us about available size and tolerance.