| 摘要 |
An optical glass having a refractive index (nd) within a range from 141 to 1.47 and an Abbe number (nud) within a range from 90 to 100 comprises in mass % on element basis: <tables id="TABLE-US-00001" num="1"> <table frame="none" colsep="0" rowsep="0"> <tgroup align="left" colsep="0" rowsep="0" cols="3"> <colspec colname="OFFSET" colwidth="49PT" align="left"/> <colspec colname="1" colwidth="63PT" align="left"/> <colspec colname="2" colwidth="105PT" align="left"/> <THEAD> <ROW> <ENTRY/> <ENTRY/> </ROW> <ROW> <ENTRY/> <entry namest="OFFSET" nameend="2" align="center" rowsep="1"/> </ROW> </THEAD> <TBODY VALIGN="TOP"> <ROW> <ENTRY/> <ENTRY>P</ENTRY> <ENTRY> 0.1-5.0%</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Al</ENTRY> <ENTRY> 1.0-20.0%</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>F</ENTRY> <ENTRY>30.0-60.0% and</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>O</ENTRY> <ENTRY> 1.0-20.0%</ENTRY> </ROW> <ROW> <ENTRY/> <entry namest="OFFSET" nameend="2" align="center" rowsep="1"/> </ROW> </TBODY> </TGROUP> </TABLE> </TABLES> and comprises, as an essential component, one or more elements selected from the group consisting of Ca, Sr and Ba. In this optical glass, the ratio (Si+B+P+Al)/F is within a range from 0.15 to 0.40.
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