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US 6,307,684 B1Granted
Zoom lens system
AssigneeOlympus Optical Co., Ltd.
InventorNoriyuki Iyama
Life of this patent
Estimating the term…
Abstract
A zoom lens system for compact cameras comprising a first positive lens unit, a second positive lens unit and a third negative lens unit: the first lens unit comprising at least a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on the image side of the positive lens component and has a concave surface on the image side. The zoom lens system is configured to perform zooming by varying an airspace reserved between the first lens unit and the second lens unit as well as an airspace reserved between the second lens unit and the third lens unit, and has a high zoom ratio and high optical performance.
Claims26
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens units;
- wherein said first positive lens unit consists of a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component, and has a concave surface on the image side;
- wherein a layer of air is reserved between the positive lens component and the negative meniscus lens component of said first lens unit;
- and
- wherein each of said first positive, second positive, and third negative lens units moves in the direction of the object side when the magnification of said zoom lens system is changed from a wide angle position to a telephoto position.
5 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component and has a concave surface on the image side, and said second positive lens unit comprises, in order from the object side, an aperture stop, a negative meniscus lens component having a concave surface on the object side and two or a smaller number of positive lens components;
- wherein a layer of air is reserved between the positive lens component and the negative meniscus lens component of said first lens unit;
- and
- wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unit and said third lens unit.
5 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component and has a concave surface on the image side, and said second positive lens unit comprises, in order from the object side, an aperture stop, a negative meniscus lens component having a concave surface on the object side and two or a smaller number of positive lens components,
- wherein the positive lens component of said first positive lens unit is a positive lens element;
- wherein a layer of air is reserved between the positive lens component and the negative meniscus lens component of said first lens unit;
- and
- wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unit and said third lens unit.
6 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component and has a concave surface on the image side,
- wherein said second positive lens unit comprises at least an aspherical surface which has a shape adapted to strengthen a negative refractive power as portions of the aspherical surface are farther from an optical axis,
- wherein lens components which have powers in said first positive lens unit comprise a positive lens element and a negative lens element, and
- wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unlit and said third lens unit.
5 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component and has a concave surface on the image side,
- wherein said third negative lens unit comprises in order from the object side, a cemented lens component consisting of an object side part having a refractive power and an image side lens part having, a positive refractive power, and a negative lens component, and
- wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unit and said third lens unit.
4 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component, and has a concave surface on the image side,
- wherein said third negative lens unit comprises, in order from the object side, a cemented lens component consisting of an object side lens part having a refractive power and an image side lens part having, a positive refractive power, and a negative lens component,
- wherein the positive lens component of said first positive lens unit is a positive lens element, and wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unit and said third lens unit.
4 more elements
A zoom lens system comprising in order from an object side:
- a first positive lens unit;
- a second positive lens unit;
- and
- a third negative lens unit,
- wherein said first positive lens unit comprises a positive lens component which is disposed on the object side, and a negative meniscus lens component which is disposed on an image side of said positive lens component and has a concave surface on the image side,
- wherein said third negative lens unit comprises, in order from the object side, a cemented lens component consisting of an object side lens part having a refractive power and an image side lens part having a positive refractive power, and a negative lens component,
- wherein a magnification of said zoom lens system is changed from a wide position to a telephoto position by varying an airspace reserved between said first lens unit and said second lens unit as well as an airspace reserved between said second lens unit and said third lens unit, and
- wherein the negative lens component of said first lens unit satisfies the following condition(1):
- 1<(r2F+r2R)/(r2F−r2R)<6 (1)
- wherein the reference symbols r2F and r2R represent radii of curvature on the object side surface and the image side surface of the negative lens component of the first lens unit.
7 more elements
Dependencies are inferred from the claim text.