Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8184522 | Optical head for optical recorder/reproducer An optical head for recording or reproducing a signal on or from an optical recording medium including a light source, an objective lens for condensing light emitted from the light source to the optical recording medium, and a light-separating device arranged betwee... | 05/22/2012 |
| 8179770 | Optical pickup apparatus An optical pickup apparatus comprising: a collimating lens configured to convert laser light emitted from a laser diode, from diffused light into parallel light; an objective lens; and a prism configured to guide the laser light emitted from the collimating lens to ... | 05/15/2012 |
| 8031577 | Optical information recording/reproducing device An optical information recording/reproducing device is provided with a first light source 20a for emitting recording light 22a, a second light source 20b for emitting reproducing light 22b, an objective lens | 10/04/2011 |
| 7952980 | Optical pickup apparatus An optical-pickup apparatus comprising: a polarization beam splitter fixed to a base, which includes a first prism that laser light emitted from a laser diode enters, a second prism that return light of the laser light reflected from a signal recording layer of an o... | 05/31/2011 |
| 7911925 | Optical pickup An adhesive positions a beam shaping element in such a manner as to satisfy the following relational expressions (1) and (2): 0 | 03/22/2011 |
| 7889622 | Optical head for optical recorder/reproducer An optical head for recording or reproducing a signal on or from an optical recording medium including a light source, an objective lens for condensing light emitted from the light source to the optical recording medium, and a light-separating device arranged betwee... | 02/15/2011 |
| 7843794 | Optical pickup and optical disk apparatus An optical pickup includes a light emitting device, a prism, and an objective lens. The light emitting device emits a laser beam. The prism has an entrance face and an exit face. In the prism, the laser beam emitted from the light emitting device is perpendicularly ... | 11/30/2010 |
| 7826330 | Optical pickup device, optical disc device and prism An optical pickup device includes: a light source; a collimator lens for converting a light beam emitted from the light source into parallel light; an objective lens for converging the light beam to the optical disc; an extending portion in which a light flux transv... | 11/02/2010 |
| 7742384 | Optical head and optical disc device The present invention aims to provide an optical head and an optical disk device capable of suitably detecting tracking error signals for different types of optical discs. A polarizing hologram element includes a first area and a second area adjacent to the f... | 06/22/2010 |
| 7619960 | Optical pickup device An optical pickup device using a laser beam comprising: a light-emitting element; a collimating lens; an objective lens; and a light-receiving element, wherein the laser beam emitted from the light-emitting element is converged on a recording surface of an optical d... | 11/17/2009 |
| 7492695 | Optical pick-up capable of increasing the quantity of received laser beam An optical pickup device according to the present invention is constituted so that a laser beam emitted from a light receiving and emitting integral-type element is transmitted or reflected by a beam splitter, transformed to a parallel beam by a collimator lens, int... | 02/17/2009 |
| 7489617 | Optical head and optical head device An optical head which has a prism with an incident section, an internal reflective surface and an emergent surface, and an optical head device which employs the optical head. Light emitted from a light source is incident to the prism through the incident section, re... | 02/10/2009 |
| 7483359 | Optical pickup head and information recording and/or reproducing apparatus incorporating same An optical pickup head (100) for a high density recording and/or reproducing device compatible with first and second optical recording media. The pickup head includes a first light source (11) emitting first light beams with a first wavelength, a secon... | 01/27/2009 |
| 7466643 | Optical pickup system and information recording and/or reproducing apparatus employing the same An optical pickup system includes a first light source emitting first light beams with a first wavelength, a second light source emits second light beams with a second wavelength greater than the first wavelength, a third light source emits third light beams with a ... | 12/16/2008 |
| 7436751 | Optical pickup head and information recording and/or reproducing device incorporating same An optical pickup head (100) for a high density recording and/or reproducing device compatible with three types of optical recording media. The pickup head includes a first light source (11a) emitting first beams with a first wavelength, a secon... | 10/14/2008 |
| 7426172 | Optical module and optical pickup including the same An optical pickup includes an optical module that detects an information signal and/or an error signal by radiating light to a recording medium and receives light reflected by the recording medium. The optical module includes a light source; an optical path changer ... | 09/16/2008 |
| 7423953 | Optical module and optical recording and/or reproducing apparatus An optical module has a first light source which emits a first light beam from a first light emission point in a predetermined direction, a second light source which emits a second light beam from a second light emission point in the predetermined direction, and an ... | 09/09/2008 |
| 7400568 | Optical device, optical pickup and optical disk apparatus An optical device wherein an optical component and a plurality of light emitting elements are mounted on an identical substrate, a level of a surface on which the optical component is mounted is different from that of a surface on which the light emitting elements a... | 07/15/2008 |
| RE40414 | Optical pickup apparatus Small-sized and light-weighted optical pickup apparatus capable of eliminating the effect due to the flaring light rays and performing the signal detection of high reliability is provided. In the apparatus, the quarter-wave (λ/4) plate and the reflection-typ... | 07/01/2008 |
| 7372798 | Optical element and optical pickup device An optical element has a dichroic film held between transparent materials which transmits one of first light in a wavelength range of 390 to 425 nm and second light in a wavelength range of 630 to 820 nm and reflects the other light, and a first, a second, a third a... | 05/13/2008 |
| 7359308 | Fixing structure for optical element and optical head device A fixing structure for an optical element includes a first element face of the optical element, a second element face of the optical element which is orthogonal to the first element face, a first positioning plane of a fixed member which abuts with the first element... | 04/15/2008 |
| 7355932 | Optical disk device for detecting thickness errors of the transparent substrate The invention detects the thickness error of the transparent substrate using a general focus error signal detection system employing the fact that the reflecting light from the optical disk causes distortions in diffraction image at the detection plane or unsymmetri... | 04/08/2008 |
| 7352517 | Optical pickup apparatus An optical pickup apparatus for conducting at least recording or reproducing of information on two types of optical information recording media having protective substrates with different thicknesses, includes: a first light source for emitting a first light flux wi... | 04/01/2008 |
| 7345982 | Optical pickup device, optical disk drive, optical device and composite optical element An optical pickup device is provided which includes a double-wavelength objective lens (34) that collects a light beam selectively emitted from a light-emitting/-detecting element (31) that selectively emits a plurality of light beams different in wave... | 03/18/2008 |
| 7342868 | Compatible optical pickup apparatus A compatible optical pickup apparatus and method are provided. The apparatus and method include a first light source for generating and emitting a first light having a predetermined wavelength, a second light source for generating and emitting a second light having ... | 03/11/2008 |
| 7339877 | Optical head device and information processing apparatus In an optical head device, a light emission source for emitting a plurality of laser beams with different wavelengths and an optical system including an objective lens and a collimator are provided. With respect to the optical system to be used in common for a plura... | 03/04/2008 |
| 7336587 | Optical pickup head compatible with multiple optical recording media An optical pickup head compatible with multiple optical recording media includes three light sources, a prism unit disposed beside the light sources, a reflective multi-surface prism disposed beside the prism unit for multiple reflecting light beams therethrough, a ... | 02/26/2008 |
| 7321542 | Beam shaping prism and optical pickup employing the same A beam shaping prism used in an optical pickup, the beam shaping prism includes a first prism having an incident surface and a second prism having an inclined surface. Since a beam entering the beam shaping prism makes right angles with a beam emerging therefrom, it... | 01/22/2008 |
| 7292515 | Multi-layer information storage system with focus and radial positioning error detection An optical information storage system has a multi-recording-layer record carrier and a scanner device for the carrier. The scanner produces a radiation beam which is compensated for spherical aberration for a single height of the scanning spot with the stack of laye... | 11/06/2007 |
| 7289416 | Optical pickup and optical disk apparatus An optical pickup for performing data recording and reproduction with respect to both CDs and DVDs and a disk apparatus incorporating the optical pickup. The optical pickup comprises a CD laser diode and a DVD laser diode, and creates a composite CD/DVD laser beam u... | 10/30/2007 |
| 7283440 | Tracking error signal detecting method selectively using a push-pull method, an improved push-pull method, and a three beam method and optical recording/reproducing apparatus using the same An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light source into a main light beam and sub-light beams which are symmetrica... | 10/16/2007 |
| 7280459 | Device for correcting signal modulations A device for reading from and/or writing to optical recording media 10, on which information is present in the form of pits, with a linearly polarized light beam 2. A device for reading from and/or writing to optical recording media 10 w... | 10/09/2007 |
| 7272100 | Optical head apparatus The present invention is for providing optical head apparatus that can control scatter occurring at locations along the length of the optical path, when laser beam is transmitted through prism constituting the No. 1 prism structural member and the No. 2 prism struct... | 09/18/2007 |
| 7251209 | Optical pickup and a wedge beam splitter An optical pickup for a recording medium includes a light source, an objective lens, a main photodetector, and a front photodetector. The configuration of the optical pickup enables converging or diverging of light to be incident on a plate beam splitter so that lig... | 07/31/2007 |
| 7248544 | Optical head and recording and/or reproducing apparatus employing same Disclosed is an optical head in which position adjustment of a photodetector light receiving surface or component parts may be simplified, production costs may be reduced and operational reliability may be improved. The optical head includes a light source 22... | 07/24/2007 |
| 7239597 | Lens for optical recording and reproducing system A lens for an optical recording and reproducing system includes: a plane of incidence on which a light generated from a light source is made incident; a first reflection side for reflecting a light passing through a plane of incidence; and a second reflection side f... | 07/03/2007 |
| 7239599 | Light irradiation head and information storage apparatus A light irradiation head of the present invention includes: a propagation body having a tapered two dimensional shape axially symmetrical to a predetermined symmetrical axis, and consisting of a first kind material that propagates electromagnetic fields of light; an... | 07/03/2007 |
| 7239594 | Self-referenced holography using element formed on a holographic medium The invention is directed to self-referenced holographic recording techniques that make use of an element of a holographic medium to create a reference beam from a zero frequency Fourier component of a data encoded object beam. In other words, the self-referencing e... | 07/03/2007 |
| 7236434 | Exposure apparatus of an optical disk master, method of exposing an optical disk master, and wavefront fluctuation correction mechanism Apparatus and method for exposing an optical disk master having a laser source, a deflector for deflecting a recording laser beam based on the laser beam of the laser source and an objective lens for focusing the recording laser beam on an optical disk master, inclu... | 06/26/2007 |
| 7233564 | Optical disk apparatus An optical disk apparatus which records/reproduces data on/from a plurality of types of optical disks. The optical disk apparatus has a plurality of laser diodes. Two laser light rays emanating from two laser diodes are coupled together by means of a coupling prism.... | 06/19/2007 |
