Patents by Inventor Charles W. Reno

Charles W. Reno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5566150
    Abstract: A multitrack optical disk has two or more circular or spiral tracks, which are recorded or played back in simultaneous sets for high data rates. Tracking is accomplished by sets of first and second tracking pads, which lie partially on and partially off the track paths. The amount of inter-track space required to accommodate the track pads is reduced by placing the overlap of the tracking pads in the same inter-track space, and by tracking any additional simultaneous tracks in excess of two by mechanical coupling with the first two.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: October 15, 1996
    Assignee: Martin Marietta Corporation
    Inventor: Charles W. Reno
  • Patent number: 5239414
    Abstract: In an optical system including a laser diode with astigmatism such that the apparent source position in two orthogonal axes each normal to the beam direction differ, a beam prism expander and a collimating lens positioned between the diode and expander, the collimated lens is positioned relative to the laser such that the radius of curvature of the light beam exiting the beam expander in the two axes is identical.
    Type: Grant
    Filed: May 30, 1991
    Date of Patent: August 24, 1993
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 5233583
    Abstract: An optical disk includes a spiraling guide track embedded in a surface of the disk on either side of which is positioned a different information track. Apparatus for both tracking and reading the disk includes a source providing two light beams directed to the disk surface and spaced apart such as to nominally illuminate respective ones of the information tracks and part of the intermediate guide track. Detectors are positioned to receive reflected light from the disk to both provide signals corresponding to information on the disk and to track the beams relative to the disk so that they are located properly with respect to the location of the information tracks on the disk.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: August 3, 1993
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 5157555
    Abstract: Apparatus for correcting spherical aberration of light reflected from a surface of an information-bearing layer of an optical disk and traversing through a substantially transparent substrate layer, overcoating the information layer, prior to traversal of a multi-element objective lens means, uses a correction lens assembly having several lens elements, with a variable air gap between the adjacent surfaces of a sequential pair of the lens elements. Information about the nominal thickness of an optical disk from which optical energy is then being reflected is obtained, and used to adjust the thickness of the air gap, to correct the additional spherical aberration caused by the change in covering substrate thickness and change the definition of the corrected spot to approach the definition of a spot obtained with a covering substrate of exactly the nominal value.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: October 20, 1992
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 4827130
    Abstract: An infrared imager includes an array of imager elements. Infrared radiation is focussed onto the array by a lens assembly including a plurality of lens elements. The imager array and the lens are within a cold box which includes an infrared-transparent window. For low noise, a spectrum-limiting filter is also located within the cold box, between the lens assembly and the window, at or within the pupil relief distance of the lens assembly. The pupil relief distance is extended by the use of at least one aspheric surface for one of the lens elements of the lens assembly. The mounting structure of the filter is the aperture stop for the infrared imager. The field of view may be reduced, if desired, without significant effect on the noise performance by use of a telescope including a second lens assembly optically identical to the first lens assembly, operated in conjunction with a confocal large-diameter lens assembly.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: May 2, 1989
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 4768184
    Abstract: A multi-beam optical recording system includes a semiconductor laser array. The laser beams are expanded via a prism beam expander to have generally circular cross-sections for optimum spot intensity on the recording medium. According to the teaching of the prior art, the average beam angle of incidence on the input prism of the beam expander is the Brewster angle. According to the present invention, means are provided for rotating the beam expander to minimize the variations in spacing between beams, these variations resulting from the magnification distortion of the prisms of the beam expander.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: August 30, 1988
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 4754446
    Abstract: A multi-beam optical record/playback system includes optical elements for directing pluralities of write and read beams as respective diffraction limited spots on the optically-sensitive surface of a rotating disk. The spots on the disk are positioned such that information can be read immediately after it is written. A prism is selectively interposed in the path of write beams for the purpose or erasing previously recorded information. The prism refracts the write beams, causing a shift of its diffraction limited spots to positions behind the corresponding read spots, thus allowing the read beams to track recorded information which is subsequently erased by the light from the refracted beams.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: June 28, 1988
    Assignee: General Electric Company
    Inventor: Charles W. Reno
  • Patent number: 4712207
    Abstract: An optical system is described for use in processing information on a surface of an erasable record disc. The system decreases erasure time by forming an elongated spot from the generally circular cross section of a collimated laser beam so as to provide increased illumination time to an area recorded on the disc. The system includes a source of collimated light having a generally circular cross section, a cylindrical lens for focusing one aspect of the collimated light at a finite distance f, and a beam expander having the principal plane of its input lens at the distance f from the cylindrical lens, where the light forms a beam waist. An objective lens focuses the expanded elongated beam to a diffraction spot on the surface of the record disc. A linear actuator, such as a voice coil, responds to a control signal to position the cylindrical lens in the path of the collimated light beam for the erasing process, or out of the light path for the recording process.
    Type: Grant
    Filed: March 18, 1985
    Date of Patent: December 8, 1987
    Assignee: RCA Corporation
    Inventor: Charles W. Reno
  • Patent number: 4590594
    Abstract: Focus error due to drift from a specified value of the pointing angle of a focus laser light beam with respect to the reflective surface of an optical disc is self-compensated by employing two light beams derived from the same focus laser that have a substantially constant angular displacement therebetween. Any change due to drift in the specified value of the pointing angle of one light beam is accompanied by a substantially equal and opposite change due to drift in the specified value of the pointing angle of the other light beam.
    Type: Grant
    Filed: November 23, 1983
    Date of Patent: May 20, 1986
    Assignee: RCA Corporation
    Inventor: Charles W. Reno
  • Patent number: 4520472
    Abstract: An optical record and playback system is described for use in a multi-channel data processing system. An optical head which includes a laser diode array comprises a collection objective, an anamorphic beam expander, a relay lens and a focusing lens having a finite conjugate. The optical head collects the laser beams emitted by the diode array, expands the beam cross-section to form circular beams and focuses the beams to diffraction limited spots. In operation the relay lens is used to image the lasing spots from the laser diode array in the conjugate plane of the finite conjugate focusing lens.
    Type: Grant
    Filed: February 7, 1983
    Date of Patent: May 28, 1985
    Assignee: RCA Corporation
    Inventor: Charles W. Reno
  • Patent number: 4507773
    Abstract: An optical beam switch is provided in a multiple beam optical disc record and playback system. Current systems for very high data rate optical disc mass memory apparatus include requirements for near-continuous recording of data using two separate turntables in a single apparatus. To reduce cost and complexities in the system as well as power requirements, the optical system includes a beam switch that allows a single record laser and modulator to be shared between two turntables. In accordance with the system a half-wave plate is shifted into and out of the beam path to effect polarization change of the light beam. A polarizing beam splitter, which follows the half-wave plate in the beam path, shifts the light beam in one of two directions depending upon the polarization of the light beam or, in other words, the position of the half-wave plate.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: March 26, 1985
    Assignee: RCA Corporation
    Inventors: James T. McCann, Lawrence W. Dobbins, Charles W. Reno
  • Patent number: 4459690
    Abstract: A wideband optical disc data record/playback apparatus is provided. The apparatus includes means for splitting the output of a single laser into multiple beams. The record beams are independently modulated and used to simultaneously record data at extremely high rates on the surface of an optical disc. The apparatus is capable of recording 1.times.10.sup.11 bits of data on one surface of an optical disc at data rates of 100 to 300 Mb/s. In addition, a plurality of coplanar low power beams are used for playback and data verification purposes. In the playback mode a single beam is split into a plurality of low power beams and one of the plurality of beams is dithered such that the dithered beam exhibits periodic excursions in a radial direction across the surface of the disc. The dithered beam is used for tracking purposes in both the playback and record mode. In a preferred embodiment the playback beams are split by an optical grating and dithered by an acousto-optic device.
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: July 10, 1984
    Assignee: RCA Corporation
    Inventors: Stephen L. Corsover, George J. Ammon, Charles W. Reno
  • Patent number: 4449215
    Abstract: A Dove prism is provided in a multiple beam optical disc record and playback system. In a multi-track optical system, the multiple spots formed in a multi-channel modulator are imaged on the record medium. The track-to-track spacing between adjacent tracks may be adjusted by rotating the Dove prism such that the angle formed between a line which passes through the center of the spots and the velocity vector of the disc is varied.
    Type: Grant
    Filed: March 24, 1982
    Date of Patent: May 15, 1984
    Assignee: RCA Corporation
    Inventor: Charles W. Reno
  • Patent number: 4449212
    Abstract: A wideband optical disc data record/playback apparatus is provided. The apparatus includes means for splitting the output of a single laser into multiple beams. The record beams are independently modulated and used to simultaneously record data at extremely high rates on the surface of an optical disc. The apparatus is capable of recording 1.times.10.sup.11 bits of data on one surface of an optical disc at data rates of 100 to 300 Mb/s. In addition, a plurality of coplanar low power beams are used for playback and data verification purposes. In the playback mode, a single beam is split into a plurality of low power beams and one of the plurality of beams is dithered such that the dithered beam exhibits periodic excursions in a radial direction across the surface of the disc. The dithered beam is used for tracking purposes in both the playback and record mode.
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: May 15, 1984
    Assignee: RCA Corporation
    Inventor: Charles W. Reno
  • Patent number: 4432085
    Abstract: A wideband optical disc data record/playback apparatus includes apparatus for splitting the output light beam of a single laser into a plurality of read and record light beams. The read and record beams are directed along a read light path including a beam splitter and a record light path including a modulator and a beam splitter respectively. In the apparatus, the read and record light beams are recombined and directed along a common light path to an objective lens where the beams are focused on a surface of a record medium as diffraction limited spots. A dual-input lens beam-expansion telescope is utilized with the beam combiner optics to provide expanded light beams which fill the entrance aperture of the objective lens.
    Type: Grant
    Filed: October 30, 1981
    Date of Patent: February 14, 1984
    Assignee: RCA Corporation
    Inventors: Charles W. Reno, Genevieve L. Allee
  • Patent number: 4105926
    Abstract: A scanner for reading binary digit spots on a transparent film includes a laser light beam which is directed through a beam splitter and through the film to a mirror, from which it is reflected back through the film to illuminate a small area on the film. Light which is not blocked by a recorded spot on the film continues back to the beam splitter, from which the beam is directed to a photodetector. The photodetector is positioned to receive light from solely a portion of the illuminated area of the film, to provide high definition scanning not adversely affected by distortion of the illuminating light beam by imperfections in the film and mirror.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: August 8, 1978
    Assignee: RCA Corporation
    Inventors: Charles W. Reno, Donald G. Herzog