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Optical Glass Type S-NBM52: higher dispersion and effective for chromatic aberration.
| Type | Code | nc | nd | nF | ng | vd | s.g. | Coloring |
|---|---|---|---|---|---|---|---|---|
| S-NBM52 | 622411 | 1.61754 | 1.62205 | 1.63268 | 1.64130 | 41.08 | 2.86 | 350/320 |
We are pleased to announce the release of a new optical glass type named S-NBM52 which has higher dispersion and maintains the same anomalous dispersion of S-NBM51 which has been used for various applications for many years. This new material is expected to be effective in correcting chromatic aberration of optical lenses, thereby improving the performance of customers’ products. It also has various lens applications, such as interchangeable lenses for various cameras, projectors, and machine vision devices.
| S-NBM52 (New product) |
S-NBM51 (Predecessor) |
||
| Eco Optical Glass | 〇 | 〇 | |
| Refractive index nd | 1.62205 | 1.61340 | |
| Abbe number vd | 41.08 | 44.27 | |
| Partial dispersion θg,F | 0.5690 | 0.5633 | |
| anomalous dispersion Δθ,g,F | -0.0060 | -0.0065 | |
| CTE α (10 -7 K-1) |
-30 ~ +70°C | 74 | 65 |
| +100 ~ +300°C | 87 | 78 | |
| Transition point Tg (℃) | 584 | 554 | |
| Yield point At (℃) | 645 | 611 | |
| Coloring degree | λ 80 | 355 | 350 |
| λ 5 | 320 | 320 | |
| Chemical durability | RW (P) | 1 | 1 |
| RA(P) | 1 | 1 | |
| W(S) | 3 | 2 | |
| SR | 1.0 | 1.0 | |
| PR | 1.0 | 1.0 | |
| Specific Gravity | 2.86 | 2.93 | |
| Knoop hardness Hk | 540〔5〕 | 560〔6〕 | |
| Abrasion degree Aa | 120 | 125 | |
Ohara Corporation Western Office
23141 Arroyo Vista, Suite 200
Rancho Santa Margarita, CA 92688
TEL: (949) 858-5700
FAX: (949) 585-5455
Ohara Corporation Eastern Office
50 Columbia Road, Branchburg
New Jersey 08876-3519
TEL: (908) 218-0100
FAX: (908) 218-1685
