JP2007004063A5 - - Google Patents

Claims (16)

  A zoom optical system in which a plurality of optical groups with variable optical power and one or more optical groups are arranged in the optical axis direction, and zooming is performed by changing the power of the plurality of optical groups with variable optical power. The plurality of optical groups with variable optical power each include a plurality of optical elements Ld that each include a rotationally asymmetric surface and move in a direction different from the optical axis to change the power in the optical group. The zoom optical system according to claim 1, wherein the group includes an optical group S including one or more optical elements Ls that are symmetric with respect to at least one surface and can be decentered. And optical power variable plurality of optical groups, two or more optical group is placed in the optical axis direction, a zoom optical system zooming optical power is changed a plurality of optical group power of variable The plurality of optical groups having variable optical power each include a plurality of optical elements Ld each including a rotationally asymmetric surface and moving in a direction different from the optical axis to change the power in the optical group. The zoom lens group includes an optical group S having one or more optical elements Ls that are symmetric with respect to at least one surface and can be decentered, and an optical group C in which optical power is unchanged. Optical system.   3. The zoom optical system according to claim 1, wherein the one or more decenterable optical elements Ls include an optical element Lss that shifts in a direction different from the optical axis.   The zoom optical system according to claim 1 or 2, wherein the one or more decenterable optical elements Ls include a tilting optical element Lst.   The zoom optical system according to claim 2, wherein the sign of the optical power of the optical group C is invariant within the entire zoom range. | Φd | max is the maximum absolute value of the optical power of the plurality of optical groups with variable optical power at all zoom positions, and the maximum absolute value of the optical power of the optical group S is at all zoom positions. When the value is | Φs | max,
| Φs | max <| Φd | max
The zoom optical system according to claim 1, wherein the following condition is satisfied. The one or more decenterable optical elements Ls include an optical element Lss that shifts in a direction different from the optical axis, and the plurality of optical elements Ld include an optical element Lds that shifts in a direction different from the optical axis. The maximum absolute value of the shift amount of the optical element Lds at all zoom positions is | Dd | max, and the maximum absolute value of the shift amount of the optical element Lss is | Ds | max at all zoom positions. When
| Ds | max <| Dd | max
The zoom optical system according to claim 1, wherein the following condition is satisfied.   When the plurality of optical elements Ld move in a direction different from the optical axis, the principal point position of the optical group including the plurality of optical elements Ld is in the optical axis direction and has a shape that moves to the outside of the optical group. The zoom optical system according to claim 1, further comprising an optical element. The front principal point position and the rear principal point position of the optical group A of the plurality of optical groups with variable optical power are respectively H _A and H _A ′, and the optical group B on the image side of the optical group A. The front principal point position and the rear principal point position are H _B and H _B ′, the distance between the object point and the front principal point position _HA is eo, the rear principal point position H _A ′ and the front principal point position H _B Is the distance between the rear principal point position H _B ′ and the image point ei, and the smaller one of the distance eo and the distance ei is e ′, at any zoom position, the distance e and the distance The zoom optical system according to claim 1, wherein e ′ is substantially the same. 0.7 <e / e ′ <1.4
The zoom optical system according to claim 9, wherein the following condition is satisfied. Of the plurality of optical groups having variable optical power, the rear principal point position of the optical group A is denoted by H _A ′,
If the front principal point position of the optical group B on the image side of the optical group A is H _B , and the optical power is within the positive range in the region where the optical power of the optical group A is variable, the power of the entire system Are the distances between the rear principal point position H _A ′ and the front principal point position H _B when the distance is the smallest and the largest, respectively, et 1, ew 1, and optical among the areas where the optical power of the optical group A is variable When the power of the entire system is the smallest in the negative power range, and the distance between the rear principal point position H _A ′ and the front principal point position H _B when the power is the largest is et2, ew2, respectively.

The zoom optical system according to claim 1, wherein the following condition is satisfied. Of the plurality of optical groups with variable optical power, when the optical group A and the optical group on the image side of the optical group are the optical group B, the optical group A and the optical group B in the entire zoom range the maximum value of the absolute value of optical power | Φ | max, when the total value of the optical power of the optical group a and the optical group B in any zoom position and [Phi _AB,
− | Φ | max ≦ Φ _AB ≦ | Φ | max
The zoom optical system according to claim 1, wherein the following condition is satisfied.   The zoom optical system includes, in order from the object side to the image side, an optical group having a variable optical power, a lens group having an invariable optical power, an optical group having a variable optical power, and an optical group having a decenterable optical element. The zoom optical system according to claim 1, wherein the zoom optical system includes:   The one or more decenterable optical elements Ls are decentered so as to correct the residual aberration of the optical group whose optical power is variable or / and the aberration generated when it is desired to change the optical power. The zoom optical system according to any one of claims 1 to 13. The zoom optical system of any one of claims 1 to 14, characterized by forming an image on the photoelectric conversion element.   An image pickup apparatus comprising: the zoom optical system according to claim 1; and a photoelectric conversion element that receives an image formed by the zoom optical system.