Lens module and image apzoom lens
US-2015323769-A1 · Nov 12, 2015 · US
Zoom lens and image pickup apparatus including the same
US8928992B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8928992-B2 |
| Application number | US-201313861758-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 12, 2013 |
| Priority date | Apr 13, 2012 |
| Publication date | Jan 6, 2015 |
| Grant date | Jan 6, 2015 |
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Abstract
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A zoom lens includes a first lens unit, a second lens unit, a third lens unit and a fourth lens unit that includes a 41 lens group and a 42 lens group. The 41 lens group includes a 411 lens group and a 412 lens group. A lens surface on a most image side of the 411 lens unit has a shape convex to the image side and a lens surface on the most object side of the 412 lens unit has a shape concave to the object side. A curvature radius r 411 of the lens surface on the most image side of the 411 lens unit, a curvature radius r 412 of the lens surface on the most object side of the 412 lens unit, and lateral magnification β3w of the third lens unit at a wide-angle end are respectively appropriately set.
First claim
Opening claim text (preview).
What is claimed is: 1. A zoom lens comprising, in order from an object side to an image side, a first lens unit having positive refractive power that does not move for zooming; a second lens unit having negative refractive power that moves during zooming; a third lens unit having positive refractive power that moves during zooming; and a fourth lens unit having positive refractive power that does not move for zooming, wherein the fourth lens unit includes a 41 lens group and a…
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Physics · mapped topic
- G02B15/144113Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
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- What does patent US8928992B2 cover?
- A zoom lens includes a first lens unit, a second lens unit, a third lens unit and a fourth lens unit that includes a 41 lens group and a 42 lens group. The 41 lens group includes a 411 lens group and a 412 lens group. A lens surface on a most image side of the 411 lens unit has a shape convex to the image side and a lens surface on the most object side of the 412 lens unit has a s…
- Who is the assignee on this patent?
- Canon Kk
- What technology area does this patent fall under?
- Primary CPC classification G02B15/144113. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 06 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).