Glass for a light filter and a light filter

Details Glass for a light filter and a light filter Glass for a light filter and a light filter

2006-09-05

2006-09-05

Stein, Stephen (Department: 1775)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S432000, C428S689000, C428S699000, C428S701000, C428S702000, C501S068000, C501S069000

Reexamination Certificate

active

07101625

ABSTRACT:
Glass for a light filter capable of preventing variation of refractive index in a band-pass filter has a coefficient of thermal expansion within a range from 90×10−7/° C. to 120×10−7/° C. within a temperature range from −20° C. to +70° C. and, preferably, Young's modulus of 75 GPa or over and Vickers hardness of 550 or over, and light transmittance for plate thickness of 10 mm of 90% or over within a wavelength range from 950 nm to 1600 nm.

REFERENCES:
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 5719989 (1998-02-01), Cushing
patent: 6461733 (2002-10-01), Goto

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