| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inexpensive compact zoom lens having excellent image formation performance, regardless of the fact that the zoom lens has an angle of view over 100°. <P>SOLUTION: The zoom lens is constituted by arranging a first lens group G<SB POS="POST">11</SB>having negative refractive power and a second lens group G<SB POS="POST">12</SB>having positive refractive power in order from an object side. The first lens group G<SB POS="POST">11</SB>is constituted by arranging a negative lens L<SB POS="POST">111</SB>, a negative lens L<SB POS="POST">112</SB>, and a positive lens L<SB POS="POST">113</SB>in order from the object side. An aspherical surface is formed on both surfaces of the negative lens L<SB POS="POST">112</SB>. The second lens group G<SB POS="POST">12</SB>is constituted by arranging a front group G<SB POS="POST">12F</SB>having positive refractive power and a rear group G<SB POS="POST">12R</SB>having positive refractive power in order from the object side. The aspherical surface is formed on both surfaces of a negative lens L<SB POS="POST">126</SB>included in the rear group G<SB POS="POST">12R</SB>. Then, a predetermined condition is satisfied so that the high image formation performance can be maintained while satisfying both of making the size smaller and the angle wider. <P>COPYRIGHT: (C)2013,JPO&INPIT |
