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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 7041950 | Image sensing element for sensing an image formed by an image sensing lens This invention realizes high-precision exposure regardless of the F-number of an image sensing lens in photography. One pixel includes a first light-receiving region (119c) which includes a region where the principal ray of an image sensing lens is inc... | 05/09/2006 |
| 6536907 | Aberration compensation in image projection displays Optical projection systems for the display of electronic images often suffer from degraded image quality due to color field registration errors caused by lateral chromatic aberration. Although most projection lenses are partially corrected for lateral chr... | 03/25/2003 |
| 4899041 | Light sensor for detecting an object in a certain distance The light sensor has a light transmitter (10, 12) which radiates the light along an axis (x0) of a transmitter system and two light receiving systems (12, 14) which pick up the light scattered back from an object (G) to be detected along a rece... | 02/06/1990 |
| 4591256 | Beam splitter and light measuring device for camera A plural number of transparent plates are arranged in parallel, a relief type diffraction grating is formed on the surface of one of the transparent plates and both transparent plates are joined so to make a beam splitter which is used as the light measur... | 05/27/1986 |
| 4220406 | Optical electronic focusing device An optical electronic device such as a photographic camera having an objective optical system for forming two images of the same object laterally offset with respect to each other, and a photoelectric receiving device receiving the offset signals. The pho... | 09/02/1980 |
| 4104652 | Single lens reflex camera A single lens reflex camera having a sharp focus detecting arrangement with one or more photoelectric cell or cells of an outer zone of a light beam entering through a photo-taking lens wholly or in parts and responsive to transition of light distribution... | 08/01/1978 |
| 4071292 | Focussing plate A large number of cones such as circular cones or pyramids, or conical recesses are regularly uniformly distributed and formed on a surface of a transparent focussing plate. Each cone or conical recess has a large number of fine irregularities on the slop... | 01/31/1978 |
