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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 5187600 | Apparatus for scanning an optical recording medium with a beam of light An optical beam scanning apparatus including a semiconductor laser, a first lens which converts a divergent beam to a parallel beam, a liquid crystal display for two-dimensionally modulating the intensity of the parallel beam and having a matrix of vertic... | 02/16/1993 |
| 5066138 | Optical head apparatus An optical head apparatus is provided with a holographic element composed of the first grid region which splits the light beam emitted from the light source into a plurality of light beams and the second grid region which diffracts the light beams reflect... | 11/19/1991 |
| 5062098 | Optical pick-up device having holographic element An optical pick-up device includes a semiconductor laser for emitting a laser beam, a focusing lens for focusing the laser beam emitted from the laser onto the surface of an optical medium, a holographic optical element having an anisotropic refractive in... | 10/29/1991 |
| 5050153 | Semiconductor laser optical head assembly An improved optical head for reading information recorded on a reflected medium. The optical head uses a hologram lens assembly having a transparent plate and a hologram lens, the transparent plate being obliquely positioned relative to a forward and a re... | 09/17/1991 |
| 5050143 | Device for optical reading and magnetic writing on a data carrier An optical reading and magnetic writing device for data on a magnetooptic recording carrier including a writing transducer (TRI) of data on the carrier disposed on a flying head (PATI), a light source (SLI) emitting a beam of polarized incident light (F | 09/17/1991 |
| 5013107 | Polarization selective holographic optical element A polarization-selective holographic element having first and second holographic layers, each holographic layer including holograms comprising a plurality of fringes. The holographic optical element transmits a first component of light without diffraction... | 05/07/1991 |
| 4905216 | Method for constructing an optical head by varying a hologram pattern A method for constructing an optical head having a holographic diffraction grating for focusing a light beam on a photodetector is disclosed. The photodetector is first mounted in the optical head and the distance between the position where the hologram l... | 02/27/1990 |
| 4866694 | Read/write head for optical disks In an optical storage system where an information bearing surface moves relative to a read/write head the latter includes a transparent body in which light beams sent to and from the surface are guided by multiple internal reflections. Beam shaping and fo... | 09/12/1989 |
| 4794585 | Optical head having a hologram lens and polarizers for use with magneto-optic medium An optical head which uses a single diffraction grating to eliminate the need for both a beam-splitter and a biprism lens. This invention allows the placement of all the elements except the photodetector along a single optical axis with the photodetector ... | 12/27/1988 |
| 4789977 | Optical data recording device An optical data recording device for focusing a laser beam on a recording medium for storing and reading out information therefrom. The device is characterized by using a high efficiency holographic grating as a polarization beam splitter. In a forward co... | 12/06/1988 |
| 4731772 | Optical head using hologram lens for both beam splitting and focus error detection functions An improved optical head which eliminates the need for a biprism or cylindrical lens for focus detection and allows the placement of a photodetector immediately adjacent to the semiconductor laser to reduce alignment problems and vibrational errors. A sem... | 03/15/1988 |
| 4689479 | Optical focussing and tracking system using a polarization prism for dividing the reflected beam This invention is characterized in that a modified polarization prism or a modified half prism is used therein. Since photodetectors serving at the same time for light signal detection, for automatic focussing and for tracking are disposed at opposite sid... | 08/25/1987 |
| 4624526 | Optical pickup device An optical pickup device to be used in a system for optically playing back recorded information comprises a diffraction grating or a hologram lens instead of a prism for directing a read-out light beam emitted by a light source to the surface of the recor... | 11/25/1986 |
| 4458980 | Optical reproducing head An optical reproducing head for reproducing an information signal recorded on an optical record medium includes a semiconductor laser for generating a laser beam, a first off-axis hologram lens irradiated with the laser beam from the semiconductor laser t... | 07/10/1984 |
| 4253723 | Apparatus for optically reading information from a record carrier Apparatus for reading optically detectable indicia on a record carrier, such as video information which is recorded in the form of pits on a record medium, for example, a video disc. A source of coherent light transmits a beam to the record carrier. A hol... | 03/03/1981 |
