| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an imaging lens whose entire optical length can be reduced, without increasing a lens substrate or a lens formed on the substrate, or without using a diffracting plane, and whose aberrations can be corrected properly. <P>SOLUTION: In the imaging lens, a first lens having a positive refractive power and Abbe numberν1 is formed on the object side of the first lens substrate; a second lens having a negative refractive power and Abbe numberν2 is formed, on the image side of the first lens substrate; and the difference (ν1-ν2) between the Abbe numberν1 and the Abbe numberν2 is set to be at least a value of 10. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
