| 摘要 |
A plastic rod lens having a cylindrical shape with a radius R including a central axis; and an outer peripheral portion, wherein a refractive index nD decreases from the central axis to the outer peripheral portion, and the following requirements (1) to (3) are met: 43≦̸&ngr;1≦̸60  (1) |{nA×&ngr;A/(nA−1)}−{nB×&ngr;B/(nB−1)}|<5  (2) n0−n1≧0.01  (3) wherein n1, n0, nA, and nB represent refraction index nD in the outer peripheral portion, at the center, and at arbitrary points A and B, respectively, and &ngr;1, &ngr;A, and &ngr;B represent Abbe number &ngr; in the outer peripheral portion, and at the arbitrary points A and B, respectively.
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