Microlens array for enhanced imaging of multiregion targets
US-2015370061-A1 · Dec 24, 2015 · US
Variable-magnification projection optical system and projection display device
US8976455B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8976455-B2 |
| Application number | US-201314142040-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 27, 2013 |
| Priority date | Jun 29, 2011 |
| Publication date | Mar 10, 2015 |
| Grant date | Mar 10, 2015 |
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Abstract
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A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens group and last lens group and are moved during magnification change. The most enlargement-side lens group (the second lens group) of the lens groups that are moved during magnification change has a negative refractive power. Predetermined conditional expressions relating to a back focus of the entire system on the reduction side at the wide-angle end, a focal length of the entire system at the wide-angle end, a focal length of the second lens group and a focal length of the last lens group are satisfied.
First claim
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What is claimed is: 1. A variable-magnification projection optical system substantially consisting of: a first lens group that has a negative refractive power, is disposed at a most enlargement-side position and is fixed during magnification change; a last lens group that has a positive refractive power, is disposed at a most reduction-side position and is fixed during magnification change; and a plurality of lens groups that are disposed between the first lens group and the last l…
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Physics · mapped topic
Physics · mapped topic
- G02B13/22Primary
Physics · mapped topic
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- What does patent US8976455B2 cover?
- A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens g…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G02B13/22. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 10 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).