| 摘要 |
A junction type compound lens using glass and resin is used. By properly controlling the difference between refractive indices and the difference between Abbe numbers of the resin and glass, interface reflection that occurs when a ray with a large incidence angle is incident is restricted, and generation of a flare or a ghost image is restricted. Further, by properly controlling the difference in refractive index and the difference in Abbe number, various aberrations, such as spherical aberration, field curvature, and chromatic aberration, which may deteriorate optical performance, can be corrected. Thus, a small and high-performance imaging lens can be provided. |
| 主权项 |
1. An imaging lens comprising:
at least one lens unit including
a junction type compound lens having
a plane parallel glass plate formed of optical glass,an object side resin lens formed of energy-curable resin, bonded to an object side surface of the plane parallel glass plate and being a planoconvex lens with a convex surface facing the object side having a positive refractive power, andan image side resin lens formed of energy-curable resin, bonded to an image side surface of the plane parallel glass plate and being a planoconcave lens with a concave surface facing the image side having a negative refractive power,wherein the imaging lens satisfies Expressions (1) to (8) as follows,
N1≦N2≦N3 (1),0.08≦N3−N1≦0.15 (2)0≦N2−N1≦0.1 (3),0≦N3−N2≦0.1 (4),|υ1−υ2|≦30 (5),|υ2−υ3|≦32.48 (6),29.5≦υ1−υ3≦40 (7), andυ2≧50 (8),where N1 is a refractive index of the object side resin lens, N2 is a refractive index of the plane parallel glass plate, N3 is a refractive index of the image side resin lens, υ1 is an Abbe number of the object side resin lens, υ2 is an Abbe number of the plane parallel glass plate, and υ3 is an Abbe number of the image side resin lens. |
