Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7362521 | Lens module and electronic device using the same A lens module includes a frame, a guide bar, a lever, a first lens and a second lens. The frame is for carrying an image sensor with a photosensitive surface. The guide bar is disposed on one side of the frame and parallel to a normal of the photosensitive surface. ... | 04/22/2008 |
| 5705803 | Covariance focus sensor A focus sensor for detecting the focus state of an image forming optical system relative to an object, the optical system having a plane of best imaging focus, includes: a plurality of image detectors located at a corresponding plurality of positions rela... | 01/06/1998 |
| 5448323 | Close-up lens assembly incorporating a photo-ranging system A plurality of fixed focus exposure lenses are mounted in a turret for manual selection of a desired focus. Each exposure lens in the turret is combined with a pair of ranging lenses for movement therewith which direct light beams to converge at the sharp... | 09/05/1995 |
| 5289220 | Detachable close-up lens assembly for an adjustable focus lens camera incorporating a photoranging system An attachment is mounted on an adjustable focus lens camera which attachment incorporates a second lens system to operate in combination with the camera lens system to allow close-up photography. The attachment further incorporates a ranging system to ins... | 02/22/1994 |
| 5142299 | Hand held system for close-range underwater photography composing and focusing A system for composing and focusing a hand-held underwater camera system includes a first light source and a second light source which each emit a beam of visible light through the water. The two visible non-laser light beams converge at a light intersect... | 08/25/1992 |
| 5109161 | Light emitter and optical system for a distance measuring device In an optical system arranged to detect a distance to an object to be photographed by projecting beams of light from a light emitting element which emits visible light or infrared rays or the like and by receiving reflected light from the object at a ligh... | 04/28/1992 |
| 4983033 | Automatic range finder for camera An automatic range finder for a camera for setting the focus position of the camera to correspond to the closest object to the camera within a specified field of view. Infrared light sources are sequentially activated to project infrared beams, through a ... | 01/08/1991 |
| 4874239 | Distance measuring device In a distance measuring device for measuring distance to an object by projecting a light beam onto the object and receiving the reflected light therefrom, the light beam to be projected onto the object is divided into a plurality of directions by a reflec... | 10/17/1989 |
| 4836671 | Locating device A device determines the location of a point, line, or plane in space with respect to an object along an axis of projection from the object. The device includes a beam generator coupled to the object and generating a plane of light containing the axis of p... | 06/06/1989 |
| 4777501 | Underwater optical methods and apparatus An underwater visual recording system capable of making consistently in-focus visual records of submarine objects includes a camera having a lens system with a predetermined depth-of-field, a first laser structured to emit a beam of coherent light of a fi... | 10/11/1988 |
| 4740678 | Automatic focus detecting device in which two objects images formed through different light paths are converted to photoelectric signals Method and apparatus for detecting a focus condition for an optical system sequentially forms two images of an object, the images propagating along two different optical paths. The two images are sequentially received with a plurality of photosensitive el... | 04/26/1988 |
| 4733062 | Focus detecting device A focus detecting device comprising a light source means alternately producing a pair of light beams directed to the surface of an object, a light receiving element arranged on an image surface and detecting the image positions of the pair of light beams ... | 03/22/1988 |
| 4589770 | Electro-optical ranging apparatus having scanning circuitry and servoloop processor for resolving separation of images on photoelectric detector arrays In an optical ranging apparatus, especially designed for measuring the range to a source of infrared radiation, a narrow band time-shift servoloop processor is used to resolve the offset (separation distance) of images of the infrared source that are proj... | 05/20/1986 |
| 4573784 | Focus detecting apparatus This specification discloses a focus detecting apparatus having an optical system for forming a plurality of object images on the basis of object lights passed through different pupil areas of an objective lens, and a sensor for putting out a plurality of... | 03/04/1986 |
| 4469939 | Distance measuring apparatus A distance measuring apparatus is provided with first and second imaging lenses for distance measurement for forming images of the same object, a first photoelectric device having a light-receiving surface for receiving the first image by the first imagin... | 09/04/1984 |
| 4397547 | Lens module for an opto-electronic range finder A lens module for use in an opto-electronic range finder double ray deflection for the projection of two images of an object onto two linear image sensors disposed in a single image plane has a prismatic body having a trapezoidal base with a V-shaped notc... | 08/09/1983 |
| 4341953 | Focus detecting system A focus detecting system for detecting focusing condition of an image forming optical system to an object. In this system there are produced first and second signals corresponding to imaging conditions of object images at first and second positions on fro... | 07/27/1982 |
| 4246486 | X-ray photography device A focus alignment system for X-ray photography devices is provided for use with such devices where the film holder is independent of the X-ray source. The X-ray source has associated therewith two light beam projectors. The beam of one light projector is ... | 01/20/1981 |
| 4117325 | Optical objective focus indicator and display Apparatus for indicating and displaying the focus of an optical objective and particularly a photographic camera. An image of the object is projected by means of the objective onto a scanning disk or plate where the light rays are divided into two separat... | 09/26/1978 |
| 4025785 | Method of and apparatus for the automatic focusing of stereoscopic microscopes For automatic focusing of a stereoscopic microscope a focusing beam of rays, preferably in the infrared range of wave length, is generated by a pulse light source, and focused on the object to be observed in the form of a small luminous area which is supe... | 05/24/1977 |
