Adaptive virtual keyboard for handheld device
US-9195818-B2 · Nov 24, 2015 · US
Image projection device, image protection method, distance measuring device and distance measuring method
US9195115B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9195115-B2 |
| Application number | US-201013501990-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 4, 2010 |
| Priority date | Oct 15, 2009 |
| Publication date | Nov 24, 2015 |
| Grant date | Nov 24, 2015 |
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Abstract
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An image projection device includes: a variable-focus lens ( 2 ) in which focal length can be changed; scanning means ( 3 ) that scans a projection surface ( 12 ) by means of a light beam that is condensed by the variable-focus lens ( 2 ); distance-measuring means ( 9 ) that measures the distance from the variable-focus lens ( 2 ) to the projection surface ( 12 ); and control means ( 4 ) that controls the variable-focus lens ( 2 ) such that the focal length of the variable-focus lens ( 2 ) is greater than the distance measured by means of the distance-measuring means ( 9 ).
First claim
Opening claim text (preview).
What is claimed is: 1. A projection device comprising: a variable-focus lens in which focal length can be changed; a distance-measuring unit that measures the distance from said variable-focus lens to a projection surface to which a light beam that is condensed by said variable-focus lens is irradiated; and a control unit that controls said variable-focus lens such that the focal length of said variable-focus lens is greater than the distance measured by said distance-measurin…
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- What does patent US9195115B2 cover?
- An image projection device includes: a variable-focus lens ( 2 ) in which focal length can be changed; scanning means ( 3 ) that scans a projection surface ( 12 ) by means of a light beam that is condensed by the variable-focus lens ( 2 ); distance-measuring means ( 9 ) that measures the distance from the variable-focus lens ( 2 ) to the projection surface ( 12 ); and control means ( 4 ) that c…
- Who is the assignee on this patent?
- Imai Hiroshi, Nec Corp
- What technology area does this patent fall under?
- Primary CPC classification G03B3/00. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 24 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).