S-LAH52Q which has extremely large dn/dT and is ideal for polished lenses of Automotive cameras.
05.31.2017
S-LAH52Q is an optical glass which has extremely large positive dn/dT. Cars are used in environments where the temperature change is large from below zero (cold district) to 50 C or above (inside car in summer). In the optical system of Automotive camera lenses, it’s common that the focal length is fixed. Optical design considering refractive index fluctuations due to temperature change is necessary. By using S-LAH52Q among an optical system that includes glass lenses with low dispersion and negative dn/dT, it is expected that refractive index fluctuations can be modified efficiently. In addition, S-LAH52Q can be used for not only Automotive camera lenses but also projectors, photographic interchangeable lenses and various applications.
(Advantages)
1.The largest positive dn/dT among OHARA glasses dn/dT (Dline 40℃~60℃) 10.3
2.Equivalent to S-LAH52 for nd and νd Different dn/dT can be selected from glasses with the
same refractive index.
| S-LAH52Q (New Product) |
S-LAH52 (Current Product) |
||
|---|---|---|---|
| Eco Optical Glass | ○ | ○ | |
| Refractive Index nd | 1.79952 | 1.79952 | |
| Abbe Number νd | 42.24 | 42.22 | |
| dn/dT relative D line 40～60℃ |
10.3 | 6.7 | |
| CTE α (10-7/℃) |
-30～70℃ | 60 | 60 |
| +100～300℃ | 73 | 73 | |
| Transformation Point Tg(°C) | 598 | 618 | |
| Yield Point At(°C) | 622 | 636 | |
| Coloring | λ80 | 390 | 395 |
| λ5 | 335 | 330 | |
| Chemical Resistance | RW(P) | 1 | 1 |
| RA(P) | 3 | 3 | |
| W(S) | 2 | 1 | |
| SR | 52.2 | 51.2 | |
| PR | 2.0 | 2.0 | |
| Chemical Resistance | 4.47 | 4.41 | |
| Knoop Hardness Hk | 620〔6〕 | 640〔6〕 | |
| Abrasion Aa | 54 | 82 | |
| Detail Catalog DATA | |||
| Available shapes |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
|
Please consult us about available size and tolerance.