Patent ID: 7864451
Filing Date: 2011-01-04
Classification: G02B

Abstract:
1. An imaging lens, comprising: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a positive refractive power; and a fifth lens unit having a negative refractive power, wherein the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit are arranged in order from the object side to the image side, wherein, during focusing from an object at infinity to a close object, the first lens unit, the third lens unit, and the fifth lens unit do not move, the second lens unit moves toward the image side, and the fourth lens unit moves toward the object side, wherein the fifth lens unit includes a fifth-a lens unit having a negative refractive power and a fifth-b lens unit having a positive refractive power in order from the object side to the image side, the fifth-a lens unit moving in a direction having a component perpendicular to an optical axis to shift a image position, and wherein, when f