S-LAH60MQ which has almost zero dn/dT in the region of LAH and is ideal for polished lenses of Automotive cameras
10.19.2018
S-LAH60MQ is an optical glass with high refractive indices which has the smallest dn/dT among current LAH glasses.
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). The large differences of the temperature may cause refractive index fluctuations. Zoom lens could adjust the refractive index fluctuations. But fixed-focus lens is common in the field of Automotive cameras and it’s impossible for us to adjust the refractive index fluctuations with fixed-focus lens.
Whereas many LAH glasses have large positive dn/dT, S-LAH60MQ has almost zero dn/dT. So S-LAH60MQ could decrease the effect of the refractive index fluctuations.
In addition, S-LAH60MQ can be used for not only Automotive camera lenses but also projectors, photographic interchangeable lenses and various applications.
(Advantages)
１．The smallest dn/dT among current LAH glasses
dn/dT(Dline 40℃~60℃) -0.1
２．Equivalent to S-LAH60 and S-LAH60V for nd,νd
We can enjoy different dn/dT glass with the same refractive indices
| S-LAH60MQ (New Product) |
S-LAH60 (Current Product) |
S-LAH60V (Current Product) |
||
| Eco Optical Glass | ○ | ○ | ○ | |
|---|---|---|---|---|
| Refractive Index nd | 1.83400 | 1.83400 | 1.83400 | |
| Abbe Number νd | 37.17 | 37.16 | 37.21 | |
| dn/dT relative D line 40～60℃ |
-0.1 | 7.9 | 9.2 | |
| CTE α (10-7/℃) |
-30～70℃ | 85 | 56 | 58 |
| +100～300℃ | 98 | 71 | 73 | |
| Transformation Point Tg(°C) | 655 | 612 | 603 | |
| Yield Point At(°C) | 688 | 632 | 635 | |
| Coloring | λ80 | 425 | 420 | 430 |
| λ5 | 340 | 340 | 350 | |
| Chemical Resistance | RW(P) | 1 | 1 | 1 |
| RA(P) | 3 | 3 | 3 | |
| W(S) | 3 | 1 | 1 | |
| SR | 51.2 | 4.2 | 51.2 | |
| PR | 1.2 | 1.0 | 1.0 | |
| Specific Gravity | 4.71 | 4.43 | 4.43 | |
| Knoop Hardness Hk | 520〔5〕 | 670〔7〕 | 660〔7〕 | |
| Abrasion Aa | 160 | 78 | 57 | |
| Detail Catalog DATA | ||||
| Available shapes |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
•pressing
•saw cut center-less groundcylindrical blanks •cut blanks |
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