Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7400450 | Light-splitting device A light-splitting device includes a power module, a transmission module and a filter module. In this case, the power module has a rotating component and a first connection component. The rotating component connects with the first connection component. The transmissi... | 07/15/2008 |
| 7390548 | Optical information storage medium An optical information storage medium includes a first substrate, a reflective layer and a second substrate. In this case, the reflective layer is disposed above the first substrate. The second substrate is disposed above the reflective layer. The material of the se... | 06/24/2008 |
| 7386215 | Projection system and light tunnel thereof A light tunnel includes a first optical element, a second optical element, a third optical element and a fourth optical element. The first optical element has a first recess. The second optical element is disposed opposite to the first optical element and has a seco... | 06/10/2008 |
| 7375884 | Rear projection screen and optical device thereof A rear-projection screen comprises an optical unit, a light-blocking layer, and an optical lens. The optical unit has a first surface and a second surface. The first surface is opposite to the second surface. The first surface has a plurality of cylindrical convexes... | 05/20/2008 |
| 7367694 | Projector and lamp housing thereof A lamp housing for a projector is for accommodating at least a lamp, and a heat-dissipating fan disposed at one side of the lamp housing. The lamp housing includes a housing body, and a baffle plate. In this case, the housing body has a first opening, and the wind b... | 05/06/2008 |
| 7287863 | Light tunnel with gradient filter layer A light tunnel with a gradient filter layer includes a light tunnel body and a gradient filter layer. In this case, the gradient filter layer is disposed at a light emerging side. The transmission rate at the central area of the gradient filter layer is smaller than... | 10/30/2007 |
| 7210821 | Light-splitting device A light-splitting device comprises a filter element, a first transmission element, a second transmission element, and a power element. In this case, the first transmission element is disposed on one side of the filter element. The second transmission element connect... | 05/01/2007 |
