Zoom optical system

Title: Zoom optical system

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20070024987, Zoom optical system.

1. A zoom optical system having an object side and an image side and comprising, arranged along an optical axis in order from the object side as follows: a first lens group having positive refractive power that includes a prism for bending the optical axis and at least one lens element having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power; wherein said second lens group and said third lens group move along the optical axis during zooming and said third lens group moves along the optical axis toward the object side and then toward the image side during zooming from the wide-angle end to the telephoto end.

2. The zoom optical system of claim 1, wherein the zoom optical system includes an image surface on the image side and the following condition is satisfied: 0<(Lm-Lt)/Fw<0.2 where Lm is the distance along the optical axis from the vertex of the most object-side lens surface of the third lens group to the image surface when the third lens group is nearest the object side during zooming; Lt is the distance along the optical axis from the vertex of the most object-side lens surface of the third lens group to the image surface at the telephoto end of the zoom range; and Fw is the focal length of the zoom optical system at the wide-angle end of the zoom range.

3. The zoom optical system of claim 1, wherein said third lens group includes a stop for controlling the amount of light that passes through the zoom optical system.

4. The zoom optical system of claim 2, wherein said third lens group includes a stop for controlling the amount of light that passes through the zoom optical system.

5. The zoom optical system of claim 1, wherein said first lens group includes, arranged along the optical axis in order from the object side as follows: a lens element having negative refractive power; a prism; and said lens element having positive refractive power.

6. The zoom optical system of claim 2, wherein said first lens group includes, arranged along the optical axis in order from the object side as follows: a lens element having negative refractive power; a prism; and said lens element having positive refractive power.

7. The zoom optical system of claim 3, wherein said first lens group includes, arranged along the optical axis in order from the object side as follows: a lens element having negative refractive power; a prism; and said lens element having positive refractive power.

8. The zoom optical system of claim 5, wherein said lens element having positive refractive power includes at least one aspheric surface.

9. The zoom optical system of claim 6, wherein said lens element having positive refractive power includes at least one aspheric surface.

10. The zoom optical system of claim 7, wherein said lens element having positive refractive power includes at least one aspheric surface.

11. The zoom optical system of claim 1, wherein said third lens group comprises: a first lens component that includes a lens element having positive refractive power that is cemented on its image side to a lens element having negative refractive power; and a second lens component that is a lens element and that is on the image side of said first lens component.

12. The zoom optical system of claim 2, wherein said third lens group comprises: a first lens component that includes a lens element having positive refractive power that is cemented on its image side to a lens element having negative refractive power; and a second lens component that is a lens element and that is on the image side of said first lens component.

13. The zoom optical system of claim 3, wherein said third lens group comprises: a first lens component that includes a lens element having positive refractive power that is cemented on its image side to a lens element having negative refractive power; and a second lens component that is a lens element and that is on the image side of said first lens component.

14. The zoom optical system of claim 5, wherein said third lens group comprises: a first lens component that includes a lens element having positive refractive power that is cemented on its image side to a lens element having negative refractive power; and a second lens component that is a lens element and that is on the image side of said first lens component.

15. The zoom optical system of claim 8, wherein said third lens group comprises: a first lens component that includes a lens element having positive refractive power that is cemented on its image side to a lens element having negative refractive power; and a second lens component that is a lens element and that is on the image side of said first lens component.

16. The zoom optical system of claim 11, wherein at least one surface of said second lens component is an aspheric surface.

17. The zoom optical system of claim 12, wherein at least one surface of said second lens component is an aspheric surface.

18. The zoom optical system of claim 16, wherein said second lens component is made of plastic.

19. The zoom optical system of claim 17, wherein said second lens component is made of plastic.

Brief Patent Description - Full Patent Description - Patent Claims

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Previous Patent Application:
Zoom lenz system, imaging device, and camera
Next Patent Application:
Lens barrel
Industry Class:
Optical: systems and elements

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