Commom zoom optical system
AssigneeNikon Corporation
InventorsToshinori Take, Daisaku Arai
Life of this patent
Estimating the term…
Abstract
The common zoom optical system is provided that is almost commonly used in a plurality of zoom lenses as a component and that is capable of suppressing fluctuation in aberrations and deviation in the position of the image plane, wherein the common zoom optical system is almost commonly used in a plurality of zoom lenses as a component, and when zooming from a wide-angle end state of a plurality of the zoom lenses composed by use of the common zoom optical system to a telephoto end state thereof, a moving path of the common zoom optical system differs for each zoom lens.
Claims16
In a group of zoom lenses that includes a first zoom lens and a second zoom lens, a zoom optical system used as a component in each of the first zoom lens and the second zoom lens and including lens groups common to the first zoom lens and the second zoom lens, and wherein:
- the first zoom lens and the second zoom lens each performs zooming from a wide-angle end state to a telephoto end state, and a first moving trajectory of the lens groups in the first zoom lens is different from a second moving trajectory of lens groups in the second zoom lens, and wherein:
- the lens groups of the first zoom lens consist of the zoom optical system alone;
- the lens groups of the second zoom lens include at least one lens group that is located at an object side of the zoom optical system in addition to the lens groups of the zoom optical system;
- and
- a distance between the at least one lens group and an adjacent lens group in the zoom optical system varies when the second zoom lens performs zooming from the wide-angle end state to the telephoto end state.
In a group of zoom lenses that includes a first zoom lens and a second zoom lens, a zoom optical system used as a component in each of the first zoom lens and the second zoom lens and including lens groups common to the first zoom lens and the second zoom lens, and wherein:
- the first zoom lens and the second zoom lens each performs zooming from a wide-angle end state to a telephoto end state, and a first moving trajectory of the lens groups in the first zoom lens is different from a second moving trajectory of lens groups in the second zoom lens, and wherein:
- the lens groups of the first zoom lens consist of the zoom optical system alone;
- the lens groups of the second zoom lens include at least one lens group in addition to the lens groups of the zoom optical system and wherein:
- a lens group located at the most object side of the zoom optical system has negative refractive power;
- and
- the second zoom lens includes a lens group having positive refractive power located at the most object side of the zoom optical system.
In a group of zoom lenses that includes a first zoom lens and a second zoom lens, a zoom optical system used as a component in each of the first zoom lens and the second zoom lens and including lens groups common to the first zoom lens and the second zoom lens, and wherein:
- the first zoom lens and the second zoom lens each performs zooming from a wide-angle end state to a telephoto end state, and a first moving trajectory of the lens groups in the first zoom lens is different from a second moving trajectory of the lens groups in the second zoom lens;
- and wherein:
- the first zoom lens includes at least one lens group in addition to the zoom optical system;
- and
- the second zoom lens includes at least one lens group in addition to the zoom optical system, the second zoom lens being different from the first zoom lens.
A method of manufacturing a group of zoom lenses including a first zoom lens and a second zoom lens comprising:
- Providing, as a component of the first zoom lens and the second zoom lens, a zoom optical system including lens groups common to the first zoom lens and the second zoom lens, and
- providing different lens group moving trajectories for the first and second zoom lenses when performing zooming from a wide-angle end state to a telephoto end state, and wherein the first zoom lens is provided with the zoom optical system alone and the second zoom lens is provided with at least one lens group that is located at an object side of the zoom optical system in addition to the zoom optical system, and a distance between the at least one lens group and an adjacent lens group in the zoom optical system varies when the second zoom lens performs zooming from the wide-angle end state to the telephoto end state.
A method of manufacturing a group of zoom lenses including a first zoom lens and a second zoom lens comprising:
- providing, as a component of the first zoom lens and the second zoom lens, a zoom optical system including lens groups common to the first zoom lens and the second zoom lens, and
- providing different lens group moving trajectories for the first and second zoom lenses when performing zooming from a wide-angle end state to a telephoto end state, and wherein the first zoom lens is provided with at least one lens group in addition to the zoom optical system, and the second zoom lens is provided with at least one lens group in addition to the zoom optical system, the second zoom lens being different from the first zoom lens.
Dependencies are inferred from the claim text.