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S-NPH7 is an optical glass which has the smallest dn/dT in the region of NPH, high refractive indices and high dispersion. In the optical system of the Automotive camera lens, it's common that the focal length is fixed. Cars are used in environments where the temperature change is large from below zero (in cold district) to 50 C or above (inside car in summer). When we make the design of optical system, considering refractive index fluctuations due to temperature change should be needed. Generally speaking, NPH glasses have positive dn/dT and the value of dn/dT is large at the positive side. But by making use of S-NPH7 which has large negative dn/dT number at the negative side, it's expected that the refractive index fluctuations could be corrected efficiently in the optical system. In addition, S-NPH7 can be used for various applications such as lenses for Automotive cameras, as well as Projectors and Photographic interchangeable lenses.

Eco Optical Glass
Refractive Index nd 1.77830
Abbe Number νd 23.91
-30~70°C 109
+100~300°C 130
Transformation Point Tg(°C) 569
Yield Point At(°C) 598
Coloring λ80 420
λ5 370
Chemical ResistanceRW(P) 1
RA(P) 1
W(S) 2
SR 1.0
PR 1.0
Specific Gravity 3.30
Knoop Hardness Hk 350[4]
Abrasion Aa 448
Detail Catalog DATA PDF
Available shapes •pressing
•saw cut center-less
groundcylindrical blanks
•cut blanks

Please consult us about available size and tolerance.

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