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 |
| 7929403 | Apparatus and method for recording information in optical storage medium To record information in an optical storage medium, a pulsed laser beam produced by a laser light source is split into first and second pulsed laser beams by a beam splitter. The first pulsed laser beam to be concentrated in the optical storage medium supported by a... | 04/19/2011 |
| 7236441 | Recording device, reproduction device, and recording/reproduction device An example recording apparatus includes a pulse oscillation laser, a half mirror for splitting the pulse oscillation light of the laser into a signal light and a reference light, an optical shutter disposed in the optical path of the signal light, a beam expander fo... | 06/26/2007 |
| 7193956 | Electron beam irradiation apparatus, electron beam irradiation method, and apparatus for and method of manufacturing disc-shaped object An electron beam irradiation apparatus and method capable of easily curing at least part of a surface layer and/or a resin layer composed of materials that are hard to be cured by irradiation of ultraviolet rays. A disc-shaped object manufacturing apparatus and meth... | 03/20/2007 |
| 7079470 | Diffraction device for reading and/or writing a record carrier A device for reading and/or writing a record carrier (13), the device comprising converging means (35, 45, 47, 106, 108) for focusing a radiation beam (27, 101) originating from a radiation source (25) on the record carrier (13). T... | 07/18/2006 |
| 6768091 | Optical pick-up device with a light amount detecting device An optical pick-up device includes a semi-conductor laser as a laser light-emitting device, a collimator lens, a directional control mirror, an objective lens, a light amount detecting device, a reflecting mirror that reflects leakage light of the laser light onto t... | 07/27/2004 |
| 6680893 | Optical element supporting device in an apparatus for recording reproducing information An optical element supporting device has one ends of two parallel plate springs, which are extended in a tangential direction, fixed to a holder, has the other ends thereof fixed to a fixture member, and has a collimator lens locked in an opening of the h... | 01/20/2004 |
| 6327237 | Optical pickup for recording or reproducing system A light source is provided for emitting a first beam having a far-field pattern of an elliptic shape. The first beam is a linearly polarized light having a first polarizing direction in a major axis of the elliptic shape. A half-wave plate is provided for... | 12/04/2001 |
| 5896361 | Master disk exposure device using optical fiber A master disk exposure device capable of projecting varying sized laser beams on a master disk, includes a slider for moving an optical fiber in a radial direction along the surface of a master disk. The optical fiber projects a beam emitted by a beam gen... | 04/20/1999 |
| 5872761 | Optical disk apparatus and optical head thereof The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light ... | 02/16/1999 |
| 5808986 | Multiple beam optical memory system with solid-state lasers An optical memory system employing multiple reading/writing optical beams from solid state lasers for simultaneously reading from a writing to multiple tracks of optical media to allow reading/writing of closely spaced adjacent tracks, a number a feature ... | 09/15/1998 |
| 5699341 | Optical disk apparatus and optical head thereof The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light ... | 12/16/1997 |
| 5680381 | Recording medium, recording method, recording/reproducing apparatus, and cutting apparatus A recording medium such as an optical or magneto-optical disk divided into servo areas and data areas, wherein at least one of pits in each servo area is formed with a phase deviation. There are also disclosed a method of recording pits on such a recordin... | 10/21/1997 |
| 5638353 | Optical head device An optical head device which has: a light source for projecting laser light; a beam splitter for reflecting the laser light onto an optical disk; an objective for focusing the reflected light on an information recording surface of the optical disk to form... | 06/10/1997 |
| 5590110 | Super-resolution optical head using optical separator A super-resolution optical head device in which a first super-resolution spot having a diameter smaller than that of a diffraction limit is formed on a recording medium by modulating beams emitted from a laser light source includes an optical system, an o... | 12/31/1996 |
| 5553053 | Optical disk device including a support member for movably supporting an objective lens in focusing and radial directions with respect to an optical disk and a detecting device for detecting a position of the objective lens An optical disk device includes a light source, an objective lens, a box body and a supporting member. The light source is provided so as not to move to the apparatus body. The box body holds the objective lens. The box body is supported movably to the ap... | 09/03/1996 |
| 5553054 | Coarse position sensor, and method for locating same, in an optical disk drive A coarse position sensor is provided for an optical recording device to generate a substantially linear coarse position signal, indicative of the position of a coarse carriage along the range of its travel, and which also is substantially immune to enviro... | 09/03/1996 |
| 5475518 | Apparatus for optically transmitting data An optical data transmission apparatus includes a hole-burning effect element for recording data. Upon transmitting input serial data in a multiplex mode along a single optical fiber, the input serial data are stored in the hole-burning effect element hav... | 12/12/1995 |
| 5281797 | Short wavelength optical disk head having a changeable aperture An optical disk head having a short wavelength light source has an aperture diaphragm placed in the course of its focusing optical system which can change its aperture diameter depending on the pit size on an optical disk in order to allow recording on an... | 01/25/1994 |
| 5161134 | Method for increasing linear bit density in magneto-optical storage media An apparatus for storing and reading a magneto-optical disk has a slit shaped aperture located in an air-bearing slider which flies above the disk. Domains of the disk are selected for storing or reading by a light beam. The domains are reduced in size wi... | 11/03/1992 |
| 4980777 | Image recording apparatus An image recording apparatus which is arranged to convert an optical image into an electrical image signal by an image pick-up and to record the image signal via a recording head on a flexible record bearing medium is provided with a head shifting mechani... | 12/25/1990 |
| 4949198 | Thermomagnetic recording head and mode of embodiment Thermomagnetic recording head for use in magnetic tape recording, comprising a layer of a ferromagnetic material set in the vicinity of a magnetic recording medium. A heating means is used to heat the layer of ferromagnetic material locally to a temperatu... | 08/14/1990 |
| 4596008 | Optical sound track playback apparatus and method The locally averaged or approximate D.C. value of a variable area optical sound track on a film is first determined, and this information is then used to control the width of a scanning slit at a playback station. The scanning slit width is reduced for sm... | 06/17/1986 |
| 4375096 | Multi-bandwidth optical playback apparatus with elongated read spot Recovery from a record of data recorded in an elongated information track, comprising undulations representative of the data is effected by an optical playback system. In the system, the data is recorded within two substantially different frequency bands.... | 02/22/1983 |
| 4223188 | Scanning system for reproduction of optical sound tracks with clear area noise discriminator delay means A variable area sound track is scanned laterally to derive width-modulated pulses which can be demodulated to audio. In order to eliminate the effect of noise on the clear area of the track, each pulse is initiated by a black-to-clear transition sensed in... | 09/16/1980 |
| 4157568 | Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size A rotatable record carrier upon which reproducible information is recorded in the form of spaced apart pits in substantially concentric circular tracks on a surface of the carrier. The pits may represent frequency-modulated information signals, and the le... | 06/05/1979 |
| 4125859 | Videodisc play-back apparatus with variable width beam Information play-back apparatus comprising a laser source, an information recorded medium, optical means for guiding a laser beam from the laser source to an information recorded track on the information recorded medium, and means for varying the size of ... | 11/14/1978 |
| 4118734 | Optical videodisc with variable width tracks A disc-shaped record carrier is described on which information is recorded in an optical structure of trackwise arranged areas and intermediate areas. By adapting the average dimensions of the areas to the average spatial frequencies on the record carrier... | 10/03/1978 |
| 4059841 | Optical read-out system including asymetrical beam intensity and four detector cells The invention relates to the optical reading of a support comprising a track along which is arranged a series of information items which optically translate a carrier wave angularly modulated by the information. The read-out system uses a single lens for ... | 11/22/1977 |
| 3980818 | Recorder and reproducer system A recorder and reproducer system is disclosed wherein video or other information is recorded by modulated laser lattice ablation of an information storage medium on or a part of a record member. A high resolution microscope objective recording head is gui... | 09/14/1976 |
| 3970803 | Printed sound track system A system for generating audible information from indicia printed on a paper, the system being particularly applicable to indicia printed in ink by conventional printing techniques. A printed sound track is provided, the sound track being oriented on the p... | 07/20/1976 |
