| 摘要 |
The present invention describes lead and arsenic free and preferably gadolinium and further preferably also fluorine free optical glasses for the application fields mapping, projection, telecommunication, optical communication engineering, mobile drive and/or laser technology with a refractive index of 1.75<=N<SUB>d</SUB><=1.85, an Abbe number of 34<=V<SUB>d</SUB><=44 and have a low transformation temperature, namely lower than or equal to 560° C. and preferably lower than or equal to 550° C., as well as good producability and processability and crystallisation stability. The glasses according to the present invention within the following composition range (based on oxide in % by weight) contain the following components: <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="28PT" align="left"/> <colspec colname="1" colwidth="105PT" align="left"/> <colspec colname="2" colwidth="84PT" align="center"/> <THEAD> <ROW> <ENTRY/> <ENTRY/> </ROW> <ROW> <ENTRY/> <entry namest="OFFSET" nameend="2" align="center" rowsep="1"/> </ROW> </THEAD> <TBODY VALIGN="TOP"> <ROW> <ENTRY/> <ENTRY>SiO<SUB>2</SUB></ENTRY> <ENTRY>0.5-8 </ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>B<SUB>2</SUB>O<SUB>3</SUB></ENTRY> <ENTRY>10-25</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>ZnO</ENTRY> <ENTRY>10-26</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>La<SUB>2</SUB>O<SUB>3</SUB></ENTRY> <ENTRY>18-34</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Ta<SUB>2</SUB>O<SUB>5</SUB></ENTRY> <ENTRY>>15-25 </ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Nb<SUB>2</SUB>O<SUB>5</SUB></ENTRY> <ENTRY>0.5-15 </ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>WO<SUB>3</SUB></ENTRY> <ENTRY> 0-10</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Al<SUB>2</SUB>O<SUB>3</SUB></ENTRY> <ENTRY>0-2</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Li<SUB>2</SUB>O</ENTRY> <ENTRY>0-5</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Na<SUB>2</SUB>O</ENTRY> <ENTRY>0-6</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>K<SUB>2</SUB>O</ENTRY> <ENTRY>0-8</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Cs<SUB>2</SUB>O</ENTRY> <ENTRY>0-9</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>MgO</ENTRY> <ENTRY>0-5</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>CaO</ENTRY> <ENTRY>0-5</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>SrO</ENTRY> <ENTRY>0-5</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>BaO</ENTRY> <ENTRY>0-5</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Y<SUB>2</SUB>O<SUB>3</SUB></ENTRY> <ENTRY> 0-10</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>TiO<SUB>2</SUB></ENTRY> <ENTRY>0-6</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>ZrO<SUB>2</SUB></ENTRY> <ENTRY> 0-11</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>HfO<SUB>2</SUB></ENTRY> <ENTRY>0-6</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Sigma B<SUB>2</SUB>O<SUB>3</SUB>, ZnO</ENTRY> <ENTRY>30-45</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Preferably Sigma La<SUB>2</SUB>O<SUB>3</SUB>, Ta<SUB>2</SUB>O<SUB>3</SUB>,</ENTRY> <ENTRY>>50</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Nb<SUB>2</SUB>O<SUB>3</SUB>, Y<SUB>2</SUB>O<SUB>3</SUB>, ZrO<SUB>2</SUB></ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Sigma Alkali oxides</ENTRY> <ENTRY> 0-15</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Sigma Alkaline-earth oxides</ENTRY> <ENTRY> 0-15</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>Sigma Al<SUB>2</SUB>O<SUB>3</SUB>, Y<SUB>2</SUB>O<SUB>3</SUB>, WO<SUB>3</SUB>, TiO<SUB>2</SUB>,</ENTRY> <ENTRY> 0-15</ENTRY> </ROW> <ROW> <ENTRY/> <ENTRY>ZrO<SUB>2</SUB>, Hf<SUB>2</SUB>O<SUB>3</SUB>, Alkaline-earth oxides</ENTRY> </ROW> <ROW> <ENTRY/> <entry namest="OFFSET" nameend="2" align="center" rowsep="1"/> </ROW> </TBODY> </TGROUP> </TABLE> </TABLES> In addition, they also may contain conventional refining agents.
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