Vari-focal lens system
AssigneeOlympus Optical Co., Ltd.
InventorsNorihiko Aoki, Hirofumi Tsuchida, Atsujirou Ishii
Life of this patent
Estimating the term…
Abstract
A vari-focal lens system comprising, in the order from the object side a movable front lens unit having negative refractive power and a movable rear lens unit having positive refractive power, said front lens unit consists of a negative lens component and a positive lens component or a single negative lens component, and said rear lens unit comprising at least one negative lens component. Said vari-focal lens system consists of a very small number of lens components, concretely specifically three or four lens components.
Claims16
A vari-focal lens system comprising, in the order from the object side, a front lens unit consisting of a first subunit having negative refractive power and a second subunit consisting of a positive lens component, and rear lens unit having positive refractive power and including at least a negative lens element, and so adapted as to vary focal length with the image point kept at a fixed location by shifting the first subunit, the second subunit and the rear lens unit while changing relative positions thereof.
A vari-focal lens system comprising, in the order from the object side,
- a movable front lens unit having negative refractive power and a movable rear lens unit having positive refractive power,
- said front lens unit having a negative lens component and a positive lens component,
- said rear lens unit having a subunit 1F and a subunit 1R comprising a negative lens element,
- an airspace reserved between the subunit 1F and the subunit 1R being variable for varying focal length, and
- said vari-focal lens system as a whole comprising at least three lens components.
A vari-focal lens system comprising, in the order from the object side,
- a movable front lens unit having negative refractive power and a movable rear lens unit having positive refractive power,
- said front lens unit having a negative lens component,
- said rear lens unit having a subunit 1F and a subunit 1R comprising a negative lens element,
- an airspace reserved between the subunit 1F and the subunit 1R being variable for varying focal length, and
- said vari-focal lens system as a whole comprising at least three lens components.
A vari-focal lens system comprising, in the order from the object side,
- a movable front lens unit having negative refractive power,
- a movable rear lens unit having positive refractive power, and
- an aperture stop arranged between said front lens unit and said rear lens unit,
- said front lens unit having a negative lens component and a positive lens components,
- said rear lens unit comprising at least one negative lens element,
- said aperture stop being fixed for varying focal length, and
- said vari-focal lens system as a whole comprising at least three lens components.
A vari-focal lens system comprising, in the order from the object side,
- a movable front lens unit having negative refractive power,
- a movable rear lens unit having positive refractive power, and
- an aperture stop arranged between said front lens unit and said rear lens unit,
- said front lens unit having a negative lens component,
- said rear lens unit comprising at least one negative lens element, said aperture stop being fixed for varying focal length, and
- said vari-focal lens system as a whole comprising at least three lens components.
Dependencies are inferred from the claim text.