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1-332840 | Dec 1989 | JPX |
Number | Name | Date | Kind |
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4859040 | Kitagishi et al. | Aug 1989 | |
4907866 | Kitagishi et al. | Mar 1990 | |
4998807 | Uzawa et al. | Mar 1991 |
Number | Date | Country |
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55-65918 | May 1980 | JPX |
58-142309 | Aug 1983 | JPX |
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Caldwell, J. B. et al; "Design of Gradient Index Lens Systems for Disc Format Cameras", Applied Optics; vol. 25, No. 18; Sep. 1986; pp. 3351-3355. |