| 摘要 |
A wide angle lens may include a first lens having a negative power with a convex surface on an object side and a concave surface on an image side, a second lens having a negative power with a concave surface on the image side, a third lens having a positive power with a convex surface on the image side, a fourth lens having a positive power with a convex surface on the image side, a fifth lens being a plastic lens with a negative power with a concave surface on the object side and a concave surface on the image side, a sixth lens being a plastic lens with a positive power with a convex surface on the object side and a convex surface on the image side, and a diaphragm disposed between the third and fourth lenses. The fifth and sixth lenses constitute a cemented lens. |
| 主权项 |
1. A wide angle lens comprising:
a first lens which comprising a first lens convex surface directed to an object side and a first lens concave surface directed to an image side, the first lens having a negative power; a second lens provided on the image side of the first lens, the second lens comprising a second lens concave surface directed to the image side, the second lens having a negative power; a third lens provided on the image side of the second lens, the third lens comprising a third lens convex surface directed to the image side, the third lens having a positive power; a fourth lens provided on the image side of the third lens, the fourth lens comprising a fourth lens convex surface directed to the image side, the fourth lens having a positive power; a fifth lens provided on the image side of the fourth lens, the fifth lens comprising a first fifth lens concave surface directed to the object side and a second fifth lens concave surface directed to the image side, the fifth lens being a plastic lens having a negative power; a sixth lens provided on the image side of the fifth lens, the sixth lens comprising a first sixth lens convex surface directed to the object side and a second sixth lens convex surface is directed to the image side, the sixth lens being a plastic lens having a positive power; and a diaphragm disposed between the third lens and the fourth lens; wherein the fifth lens and the sixth lens constitute a cemented lens. |
