Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kk OharafiledCriticalKk Ohara
Priority to MYPI93001995ApriorityCriticalpatent/MY107681A/en
Publication of MY107681ApublicationCriticalpatent/MY107681A/en
AN OPTICAL GLASS WHICH IS A SIO2 - NB2O5 - R'2O (R'BEING AN ALKALI METAL ELEMENT) - F SYSTEM OF A SPECIFIC COMPOSITION RANGE EXHIBITS OPTICAL CONSTANTS OF A REFRACTIVE INDEX (ND) OF ABOUT 1.60 OR BELOW AND AN ABBE NUMBER (2D) OF ABOUT 57 - 40, IS FREE OF PBO AND HAS AN IMPROVED LIGHT TRANSMISSIVITY.
MYPI93001995A1993-09-301993-09-30Low refractive optical glass of a flint glass type.
MY107681A
(en)
Optical imaging system including generally conical, transparent protective dome and optically refractive fixed corrector for reversing conical deformation created by viewing through the dome