JP2007004061A5

JP2007004061A5 -

Info

Publication number: JP2007004061A5
Application number: JP2005186982A
Authority: JP
Filing date: 2005-06-27
Publication date: 2008-08-14
Anticipated expiration: 2025-06-27

Claims

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 include rotationally asymmetric surfaces and move in a direction different from the optical axis to change the power in the optical group,
At the telephoto end, the absolute value of the sum of the powers of the plurality of optical groups whose optical power is variable is expressed as | φdt |,
When | φst | is the absolute value of the total power of the one or more optical groups, | φdt | ≦ | φst |
A zoom optical system characterized by satisfying the following condition.

Of the plurality of optical groups having variable optical power, when the optical group A and the optical group on the image side of the optical group A are the optical group B,
When zooming from the telephoto end to the wide-angle end,
The power of the optical group B changes from negative to positive,
Within the entire zoom range, there is a zoom position where the optical powers of the optical group A and the optical group B match,
2. The zoom optical system according to claim 1, wherein the coincident zoom position is located on a wider angle side than an intermediate zoom position within the entire zoom range.

Of the plurality of optical groups having variable optical power, when the optical group A and the optical group on the image side of the optical group A are the optical group B, the absolute optical power is obtained at the zoom position at the wide-angle end. When the larger value is | φgw | max and the smaller optical power absolute value at the zoom position at the telephoto end is | φgt | min | φgw | max <| φgt | min
The zoom optical system according to claim 1 or 2, wherein the following condition is satisfied.

Of the plurality of optical groups having variable optical power, when the optical group A and the optical group on the image side of the optical group A are the optical group B, the maximum absolute value of the optical power in the entire zoom range When the value is | φ | max and the total value of the optical power at any zoom position of the optical group A and optical group B is φ _AB − | φ | max ≦ φ _AB ≦ | φ | max
The zoom optical system according to claim 1, 2 or 3, wherein the following condition is satisfied.

i represents the order of the optical surface S of the optical element of the entire system in order from the object side to the image side, the inclination of the tangent to the optical axis at the point where the optical surface Si and the optical axis intersect with Ki, and the maximum value of the inclination K _max , The total of the optical system tilt Ki

When

The zoom optical system according to claim 1, wherein the following condition is satisfied.

When the change amount of the optical power accompanying the zooming of the optical surface of the optical element constituting the plurality of optical groups having the variable optical power is Δφ 0 (degree · mm) ≦ K _max / Δφ ≦ 3 (degree · mm)
The zoom optical system according to claim 1, wherein the following condition is satisfied.

The zoom lens has a stop in the optical path, and the one or more optical groups are arranged in order from the stop toward the image side. The zoom optical system according to any one of claims 1 to 6, wherein an optical group is included.

When the optical power of the optical group when a plurality of optical elements that change the power in the optical group are displaced by δ from the optical axis is δ × φ <6
The zoom optical system according to claim 1, wherein the following condition is satisfied.

9. The optical device according to claim 1, wherein at least one of the plurality of optical groups having variable optical power includes an optical element having an optical power having an opposite sign at the wide-angle end. 1 zoom optical system.

Of the plurality of optical groups having variable optical power, when the optical group A and the optical group on the image side of the optical group A are the optical group B,
In order from the object side to the image side at the wide-angle end, the optical group A is composed of an optical element having a positive refractive power and an optical element having a negative refractive power.
The zoom optical system according to any one of claims 1 to 9, wherein the optical group B includes an optical element having a positive refractive power and an optical element having a negative refractive power.

Of the plurality of optical groups having variable optical power, when the optical group A and the optical group on the image side of the optical group A are the optical group B,
In order from the object side to the image side at the telephoto end, the optical group A is composed of an optical element having a positive refractive power and an optical element having a positive refractive power.
The zoom optical system according to any one of claims 1 to 10, wherein the optical group B includes an optical element having a negative refractive power and an optical element having a negative refractive power.

The zoom optical system of any one of claims 1 to 11, characterized by forming an image on a photoelectric conversion element.

An imaging 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.