Projector that is capable of superimposing and displaying a visible image and an invisible infrared image
US7934836B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2008 |
| Grant date | May 3, 2011 |
| Priority date | — |
| Expiry date | May 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projector includes a light source that emits light including visible light and infrared light, a light separating unit that separates the light from the light source into lights in plural different wavelength regions, at least one light modulation element for visible light that modulates visible light separated by the light separating unit, at least one light modulation element for infrared light that modulates one kind of infrared light or at least two kinds of infrared light in wavelength regions different from each other separated by the light separating unit, a light combining unit that combines the modulated light modulated by the light modulation element for visible light and the modulated light modulated by the light modulation element for infrared light into one to form combined light, and a projecting unit that projects and displays the combined light combined by the light combining unit on a projection surface. The projector superimposes and displays a visible light image formed by the light modulation element for visible light and an infrared image formed by the light modulation element for infrared light on the identical projection surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.