Projection system with infrared monitoring function
US9420246B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2012 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | Feb 6, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/142
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A projection system includes a projection module, an infrared monitoring module, and a focusing device. Lights of a projection light source (100) pass through a light splitting element (500) and a first lens group (201), and then emit out; infrared lights from outside pass through the first lens group (201) and the light splitting element (500) to an infrared monitoring module (300). Only the first lens group (201) can move back and forth and a focusing device is provided for driving the first lens group (201) to move back and forth. Optical characteristics of a projection objective (200) and a monitoring objective ensure that, during moving of the first lens group (201) driven by the focusing device, the projection objective (200) focuses clearly, and an infrared monitoring image received by an induction chip (301) meets monitoring requirements synchronously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.