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| Number | Title | Issue Date |
| 8081554 | Optical pickup device with specific wavelength light blocking members for preventing further curing of adhesive An optical pickup device includes: a light source for emitting light in a first wavelength range; an optical element for transmitting the light; a supporting member for supporting the optical element through an adhesive; a first light blocking member for blocking th... | 12/20/2011 |
| 8040782 | Wavelength-selective light-shielding element and optical head using the same In order to provide a wavelength-selective light-shielding element capable of blocking circularly-polarized light beams rotating in a specific direction among light beams whose wavelengths falling in a specific range, a light-shielding region is provided in a portio... | 10/18/2011 |
| 8036093 | Optical head device and recording/reproduction device An optical head device includes a first light source and a second light source respectively emitting a first light beam and a second light beam, a luminous flux separating section selectively separating the first and second light beams for which the same optical pat... | 10/11/2011 |
| 8000208 | Laminated wave plate and optical pickup device using the same A laminated wave plate that corresponds to a plurality of wavelengths including at least two wavelengths of λA and λB, and includes a first wave plate disposed on an incident side and a second wave plate disposed on an emitting side, the firs... | 08/16/2011 |
| 7907500 | Radio frequency zero crossing signal generator for optical disc drive The invention discloses radio frequency zero crossing signal generators for optical disc drives, comprising a controllable low pass filter, a comparator, and a control circuit. The controllable low pass filter evaluates an average level of the magnitude of a radio f... | 03/15/2011 |
| 7894321 | Laminated wave plate and optical pickup using the same A laminated plate having a wider bandwidth at a desired retardation is provided. A laminated wave plate 1 includes a first wave plate 2 and a second wave plate 3 that are laminated to each other so that respective optical axes of the first wave ... | 02/22/2011 |
| 7613098 | Objective optical system for optical recording media and optical pickup device using it An objective optical system focuses light from a light source onto at least two different types of optical recording media having different substrate thicknesses in order to record or reproduce information on the optical recording media by using a variable refractiv... | 11/03/2009 |
| 7492693 | Optical recording/reproducing apparatus with transmission amount variation unit When a light-receiving element receives a first laser beam, an output power detection unit detects a differential quantum efficiency value of the first laser beam. A control unit judges whether or not an intensity filter and a filter driving unit are operated in acc... | 02/17/2009 |
| 7414951 | Optical head device and optical recording and reproducing apparatus An optical head device and an optical recording and reproducing apparatus using this optical head device, which can record information and reproduce the recorded information at any of optical recording media, such as a next generation optical recording medium, in wh... | 08/19/2008 |
| 7385904 | Optical pickup device A phase shift element has a tiered phase difference pattern portion, in which an inner circular side tiered phase difference pattern portion is continuously connected with an outer circular side tiered phase difference pattern portion based on a phase function curve... | 06/10/2008 |
| 7372794 | Compatible optical pickup applying tilt to objective lens in proportion to radial movement of objective lens A compatible optical pickup compatibly using a high density recording medium and at least one low density recording medium, includes an objective lens to form a light spot suitable for use on a recording surface of the high density recording medium by focusing a cor... | 05/13/2008 |
| 7352678 | Laminated wave plate and optical pickup using the same A conventional broadband quarter-wave plate has not completely solved the wavelength dependence and has different efficiencies of shifting the phase by 90° depending on the wavelengths, and therefore has a problem that it cannot fulfill the strict specificat... | 04/01/2008 |
| 7336586 | Optical pickup device compatible with two types of optical recording media An optical pickup device compatible with two types of optical recording media in accordance with the present invention includes: a first light source emitting a first laser beam with a first wavelength; a second light source emitting a second laser beam with a secon... | 02/26/2008 |
| 7326876 | Sequential lateral solidification device A sequential lateral solidification device, for enhancing optical characteristics of the device and for preventing damage caused by an ablation of a crystallization thin film, is disclosed. The device includes a laser light source generating a laser beam, a projecti... | 02/05/2008 |
| 7301703 | Tunable filter and method of manufacturing the same, and sensing device A tunable filter including; a fixed substrate provided with a fixed reflecting film and capable of transmitting light having a shorter wavelength than infrared light; a movable substrate provided with a movable section equipped with a movable reflecting film and dis... | 11/27/2007 |
| 7274649 | Holographic ROM system A holographic ROM system of the present invention includes a lens unit for filtering and collimating an output radiation diffracted from a holographic disk in order to produce an output data beam. The lens unit includes an objective lens for collimating the output r... | 09/25/2007 |
| 7206275 | Optical pickup device An aberration correction element is disposed between first to third laser light sources and an objective lens, first and second laser lights emitted from the first and second laser light sources are incident upon the aberration correction element in the form of para... | 04/17/2007 |
| 7193954 | Optical pickup device and objective lens for the optical pickup device An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element, wherein the first objective optical element converges the light flux emi... | 03/20/2007 |
| 7180846 | Phase compensator and compatible optical pickup using the phase compensator A compatible optical pickup for recording and/or reproducing information on/from multiple kinds of optical discs having different thicknesses by selectively using source lights of respective different wavelengths corresponding to a kind of disc and using a common ob... | 02/20/2007 |
| 7154837 | Optical pickup and optical information recording/reproducing device An optical pickup and an optical information recording/reproducing device are provided, each of which is capable of forming a super-resolution spot to conduct micro-mark recording, and does not undergo signal degradation due to an increased sidelobe in a reproducing... | 12/26/2006 |
| 7142497 | Optical pickup and optical information processing apparatus with light sources of three different wavelengths An optical pickup apparatus for performing recording, reproduction and deletion of information onto each of three types of optical recording mediums including light sources of a blue wavelength zone, light sources of a red wavelength zone and light sources of an inf... | 11/28/2006 |
| 7139233 | Optical information processing device and recording medium An optical information processing device is provided with a multi-wavelength light source that emits light of two or more different wavelengths, a filter portion that separates the light emitted from the multi-wavelength light source according to wavelength, and a c... | 11/21/2006 |
| 7106681 | Optical head arrangements with single substrate lasers An optical head with a plurality of semi-conductor laser chips for use in reducing inclination or gradient of more than one beam presently falling onto a focusing lens is disclosed. To this end, a double mirror or alternatively beam reshaping means is disposed which... | 09/12/2006 |
| 7085219 | Optical lens and optical information recording and reproducing apparatus An optical lens for condensing a light emitted from a laser light source on an optical recording medium, the light having a wavelength λ1 within a wavelength range from 400 nm to 440 nm, comprises: a light incident side lens surface disposed on a side which ... | 08/01/2006 |
| 7082093 | Optical data storage system having combined fluorescent three-dimensional information carrier A general optical storage system (OSS) contains an optical drive and a fluorescent multilayer disc (FMLD), which can be realized as a multilayer structure with data storage in fluorescent spots like pits or spiral grooves, divided by layers, transparent to reading a... | 07/25/2006 |
| 7075879 | Optical pickup device and a method to control an angle between a pit and a major axis of a laser beam An optical pickup device for a relatively thick disc and/or a relatively thin disk including first and second laser light sources emitting first and second light beams, a first grating splitting the light beams emitted from the second light source, a beam splitter c... | 07/11/2006 |
| 7002892 | Optical pickup reproducing apparatus having reading compatibility among recording media with respective recording densities different from one another A liquid crystal element is provided as a polarization plane rotating device between a laser beam source and a beam splitter. Light emitted from the laser beam source passes through the liquid crystal element and the beam splitter, and is converted into parallel lig... | 02/21/2006 |
| 6944111 | Information reading and recording apparatus An information reading and recording apparatus includes a super-resolution cut-off filter having an annular metal reflection film at its center portion and disposed immediately before one of two objective lenses with a higher NA. When reading DVD, the one objective ... | 09/13/2005 |
| 6930962 | Optical information reading apparatus with super-resolution cut-off filter An optical information reading apparatus includes a semiconductor laser, a beam splitter, a collimating lens, a super-resolution cut-off filter, an objective lens having a high numerical aperture, and a photodetector. The super-resolution cut-off filter is disposed ... | 08/16/2005 |
| 6853614 | Aberration correction element and optical pickup adopting the same An optical pickup includes an aberration correction element to correct chromatic aberration caused by variation of power from a light source when changing between operating modes in a recording medium. The aberration correction includes a first retardation member, w... | 02/08/2005 |
| 6788637 | Apparatus for reading from and/or writing to optical recording media An apparatus for reading from and/or writing to optical recording media on which data markings are arranged along tracks arranged next to one another. The apparatus according to the present invention comprises a light source, a focusing means and an intensity distri... | 09/07/2004 |
| 6738337 | Only-readable three-dimensional optical storage device The invention relates to the information storage. It consists of a computer, a precise rotary table, a writing laser source, a readout laser source, a spatial filter, a spatial light modulator, lens, mirrors, photorefractive crystals (such as doubly doped lithium ni... | 05/18/2004 |
| 6545823 | Double-wavelength aperture restricting filter and optical pickup apparatus using the same A double-wavelength aperture restricting filter has a zonal part adapted to act such that one wavelength λ1 of light keeps the quantity of light in an outer peripheral part of the luminous flux thereof whereas the other wavelength λ2 | 04/08/2003 |
| 6480455 | Optical pickup device applicable to two kinds of recording media with minimized deterioration of a beam spot An optical pickup device shares an objective lens for two different light sources so as to handle two kinds of optical recording media, that is, a first optical recording medium and a second optical recording medium, the second optical recording medium ha... | 11/12/2002 |
| 6298028 | Optical head and information recording and reproducing apparatus using it In an optical head for recording on or reproducing from a plurality of kinds of optical information recording media corresponding to a plurality of kinds of different wavelengths, coma aberration is prevented, and low price and high reliability are realiz... | 10/02/2001 |
| 6009065 | Optical pickup for 3-D data storage reading from the multilayer fluorescent optical disk An optical pickup providing the 3-D reading of the binary optical information from the multilayer fluorescent disk by means of fluorescent sites excitation, is described. The 2-D information at the separate layer is recorded by chemical transformation of ... | 12/28/1999 |
| 5940360 | Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes Beams generated from first and second laser light sources are reflected by a beam splitter to proceed toward an optical disc. The laser beams focus onto the optical disc via a selective light-transmitting part installed in front of the optical disc and an... | 08/17/1999 |
| 5917800 | Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes A beam generated from a laser light source are reflected by a beam splitter to proceed toward an optical disc. The beam focus onto the optical disc via a selective light-transmitting part installed in front of the optical disc and an objective lens. The b... | 06/29/1999 |
| 5784352 | Apparatus and method for accessing data on multilayered optical media Apparatus and methods for accessing data on a multilayered optical storage medium. The apparatus uses the time-of-flight of illumination directed to and reflected by the layers of the optical medium to access data stored on a desired layer of the medium. ... | 07/21/1998 |
| 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 |
