S-LAH63Q which has small positive dn/dT and is equivalent to S-LAH63 for nd & νd. It’s ideal for polished lenses of Automotive cameras
11.30.2017
SS-LAH63Q is an optical glass with high refractive indices which has the smallest positive dn/dT at the region of LAH. In the optical system of Automotive camera lenses, it’s common that the focal length is fixed. And cars are used in environments where the temperature change is large from below zero (in cold area) to more than 50 C (inside car in summer). So refractive indices fluctuations due to temperature change should be considered for the optical system. LAH glasses generally have positive large dn/dT. By using S-LAH63Q of which the dn/dT is close to zero, it is expected that refractive indices fluctuations due to temperature change can be adjusted efficiently. In addition, S-LAH63Q can be used for not only Automotive camera lenses but also Projectors, Photographic interchangeable lenses and various applications.
(Advantages)
1.The smallest positive dn/dT at the region of LAH (Dline 40℃~60℃) 1.6
2.Equivalent to S-LAH63 for nd and νd Different dn/dT can be selected from glasses with the
same refractive index.
| S-LAH63Q (New Product) |
S-LAH63 (Current Product) |
||
| Eco Optical Glass | ○ | ○ | |
| Refractive Index nd | 1.80440 | 1.80440 | |
| Abbe Number νd | 39.58 | 39.59 | |
| dn/dT relative D line 40～60℃ |
1.6 | 7.5 | |
| CTE α (10-7/℃) |
-30～70℃ | 79 | 58 |
| +100～300℃ | 93 | 70 | |
| Transformation Point Tg(°C) | 669 | 607 | |
| Yield Point At(°C) | 701 | 630 | |
| Coloring | λ80 | 415 | 410 |
| λ5 | 345 | 340 | |
| Chemical Resistance | RW(P) | 1 | 1 |
| RA(P) | 3 | 3 | |
| W(S) | 3 | 1 | |
| SR | 51.2 | 4.2 | |
| PR | 1.0 | 1.0 | |
| Specific Gravity | 4.45 | 4.34 | |
| Knoop Hardness Hk | 580〔6〕 | 640〔6〕 | |
| Abrasion Aa | 121 | 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 shapes,dimentions and tolerance.