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| Number | Title | Issue Date |
| 8144564 | Optical head and optical information device An optical head according to the present invention includes: a first light source that emits light with a first wavelength; a beam splitter that splits the light emitted from the first light source into a first light beam traveling in a first direction and a second ... | 03/27/2012 |
| 8111602 | Objective lens, optical pickup device, and optical disk drive Provided are an optical pickup apparatus and an objective lens which can record and/or reproduce information for discs with different recording densities and can realize simplification of the structure of themselves and reducing cost. When the expression (1) is sati... | 02/07/2012 |
| RE43106 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the optical pickup apparatus including two laser light sources to emit light b... | 01/17/2012 |
| 8064315 | Condensing optical device, optical pickup, and optical disc apparatus An optical pickup includes: a first emission unit emitting an optical beam with a first wavelength corresponding to a first optical disc; a second emission unit emitting an optical beam with a second wavelength, which is longer than the first wavelength, correspondi... | 11/22/2011 |
| 8050168 | Optical head device, optical information device, computer, disc player, car navigation system, optical disc recorder, and vehicle An optical head device compatible to different types of optical discs and capable of guaranteeing a sufficiently wide dynamic range for a low density optical disc, and the like are provided. The optical head device includes a plurality of light sources switch... | 11/01/2011 |
| 8023389 | Objective lens, optical pickup apparatus, and optical information recording reproducing apparatus An objective lens relating to the present invention includes a first optical path difference providing structure in which a first basic structure and a second basic structure are overlapped with each other. The first basic structure is a blaze-type structure which e... | 09/20/2011 |
| 8023388 | Objective lens, optical pickup apparatus, and optical information recording reproducing apparatus An objective lens includes a first optical path difference providing structure in which a first basic structure and a second basic structure are overlapped together, and a second optical path difference providing structure in which a third basic structure, a fourth ... | 09/20/2011 |
| 7924683 | Optical pickup apparatus with objective optical system and guiding optical system An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength λ1 (430 nm>λ1>380 nm), a second light source for emitting a second light flux having second wavelength λ2 (λ2>λ1), an objective optical system hav... | 04/12/2011 |
| 7920455 | Complex optical element and optical pickup A complex optical element includes a first optical portion and a second optical portion which are made of materials different from each other. The second optical portion is bonded to an optical functional face of the first optical portion. A concavoconvex face part ... | 04/05/2011 |
| 7889618 | Objective optical element and optical pickup apparatus A first phase structure corrects at least one of a spherical aberration due to a difference between a protective substrate thickness t1 and a protective substrate thickness t2 and a spherical aberration due to a difference between a first wavelength λ1 and a second... | 02/15/2011 |
| 7864650 | Optical element, optical head, optical information recording and reproduction apparatus, computer, image recording device, image reproduction device, server and car navigation system The present invention provides a first light source (21) that emits light of a first wavelength, that at least either records onto or reproduces information from an information recording medium (30), a light source (22) that emits light of a sec... | 01/04/2011 |
| 7848208 | Optical head device, aberration correction method and optical information processing apparatus An optical head device is provided with a semiconductor laser, an aberration correcting element for transmitting a beam from the semiconductor laser, a light guiding portion for introducing the beam from the semiconductor laser to the aberration correcting element, ... | 12/07/2010 |
| 7839752 | Optical disc drive and objective lens for the same There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an o... | 11/23/2010 |
| 7778139 | Optical information recording/reproducing device and objective lens for the same There is provided an objective lens used for an optical information recording/reproducing device for recording information to and/or reproducing information from two types of optical discs, by selectively using one of two types of substantially collimated light beam... | 08/17/2010 |
| 7751298 | Optical disc apparatus A liquid crystal element for correcting wave aberration included in an optical disc apparatus, is controlled by a liquid crystal element control unit which has a memory portion that stores information about a variation with time of orientation direction of liquid cr... | 07/06/2010 |
| 7688701 | Objective optical system and optical pickup apparatus An objective optical system according to the present invention is provided for use in an optical pickup apparatus for recording or reproducing information on an information recording surface of a first optical information recording medium using a first light flux em... | 03/30/2010 |
| 7646696 | Objective optical element and optical pickup apparatus An objective optical element for use in an optical pickup apparatus, includes two or more optical elements having a first surface having a first phase difference providing structure and a second surface having a second phase difference providing structure, wherein e... | 01/12/2010 |
| 7636290 | Optical element, optical objective element, and optical pickup apparatus having diffractive structure and optical difference giving structure An optical element comprises: a diffractive structure having a plurality of diffracting ring-shaped zones arranged around an optical axis on at least one optical surface; and an optical path difference giving structure arranged on an optical surface of at least one ... | 12/22/2009 |
| 7636291 | Optical pickup apparatus The present invention provides an optical pickup apparatus including a first light source, a second light source, a third light source, and a light-converging optical system including an objective lens. The objective lens includes at least one optical surface with a... | 12/22/2009 |
| 7623434 | Objective lens, optical pickup apparatus and optical disc driving apparatus An objective optical lens for use in an optical pickup apparatus, includes: an optical surface divided into at least two areas including: a central area including a first diffractive structure; and a peripheral area including a second diffractive structure, the obje... | 11/24/2009 |
| 7613096 | Converging optical element and optical pickup apparatus A converging optical element for use in an optical pickup apparatus reproducing and/or recording information on a first optical disc using a first light flux with a wavelength λ1 emitted by a first light source, reproducing and/or recording information on a ... | 11/03/2009 |
| 7508745 | Optical element having a refractive function and an optical path difference providing function An optical system has an optical functional surface including a common region used for conducting information recording and/or reproducing for both of a first optical information recording medium and a second optical information recording medium. The common region c... | 03/24/2009 |
| 7471611 | Zone phase correcting lens and optical head device A zone phase correcting lens wherein a change in the third-order spherical aberration or the like is small in the case of a change in temperature and an optical head device having the zone phase correcting lens used as an objective lens. A minus sign is appended to ... | 12/30/2008 |
| 7466642 | Optical element, optical head, optical information recording/reproduction device, computer, video recording device, video reproduction device, server, and car navigation system The present invention provides a first light source (21) that emits light of a first wavelength, that at least either records onto or reproduces information from an information recording medium (30), a light source (22) that emits light of a sec... | 12/16/2008 |
| 7457223 | Objective lens for optical recording media and optical pickup device using it An objective lens consists of two lens elements of different materials that are cemented. The lens surfaces that are cemented includes a phase function so that the cemented surface forms a optical diffractive surface that enables the objective lens to focus incident... | 11/25/2008 |
| 7443778 | Optical head device and optical information device using the same, computer, optical disk player, car navigation system, optical disk recorder, and optical disk server It is an object of the present invention to record to and reproduce different types of optical disks using light beams with different wavelengths. In an optical head device for recording to and reproducing high-density optical disks using an objective lens with a la... | 10/28/2008 |
| 7440382 | Objective optical element with multiple diffractive surfaces and optical pickup device An objective optical element for use in an optical pickup apparatus comprises a first optical surface including a first diffractive structure which comprises a plurality of concentric ring-shaped diffractive zones having a center on the optical axis and stepped surf... | 10/21/2008 |
| 7433290 | Complex objective lens, optical head, optical information apparatus, computer, optical disk player, car navigation system, optical disk recorder, and optical disk server A complex objective lens composed of a hologram and an objective lens, capable of realizing stable and high-precision compatible reproducing/recording of a BD with a base thickness of about 0.1 mm for a blue light beam (wavelength λ1) and a DVD with a base t... | 10/07/2008 |
| 7433291 | Objective lens An objective lens used for recording data to and/or reproducing data from a plurality of types of optical discs having different thicknesses of cover layers. The objective lens satisfies a condition 0.02 | 10/07/2008 |
| 7430159 | Optical pick-up and objective lens for use with different types of optical discs There is provided an optical pick-up used for recording data to and/or reproducing data from at least three types of optical discs having at least two different thicknesses of cover layers. The optical pick-up includes light sources and an objective lens. A thicknes... | 09/30/2008 |
| 7428207 | Aberration correcting device and optical recording medium reproducing apparatus A disk reproducing apparatus for reproducing a disk that is any one of three kinds of disks, BD, DVD and CD, employing a BD objective lens, correct only aberration occurring inside the effective diameter of DVD, and leaves aberration outside the effective diameter, ... | 09/23/2008 |
| 7426170 | Objective lens and optical pickup apparatus for reproducing and/or recording information for at least two types of optical discs An objective lens according to the present invention is provided for use in an optical pickup apparatus at least reproducing and/or recording information using a light flux with a wavelength λ1 emitted by a first light source for a first optical disc and rep... | 09/16/2008 |
| 7417935 | Optical system having an objective system and an optical aberration correcting element An optical system for use in an optical pickup device for recording and/or reproducing information on an optical recording media, the optical system having an optical axis and comprising: an objective system for converging a light beam emitted from a light source on... | 08/26/2008 |
| 7411884 | Optical system with objective lens having diffraction structure An optical system for an optical disc drive includes a light source, an objective lens and a collimator lens. The light source emits first and second light beams. The first light beam is for reproducing data from a digital versatile disc while the second light beam ... | 08/12/2008 |
| 7408866 | Objective lens for optical pickup apparatus, optical pickup apparatus and optical information recording reproducing apparatus An objective lens, comprises a first diffractive structure having plural concentric ring-shaped zones. A n1-th order diffracted ray is converged on an information recording surface of first optical information recording medium through first protective substra... | 08/05/2008 |
| 7394733 | Optical head with spherical aberration correction and method of using same An optical head with excellent optical characteristics even when using a light source that substantially has a wavelength broadening is provided. The optical head includes a light source, an objective lens for focusing a light beam emitted from the light source on a... | 07/01/2008 |
| 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 |
| 7369480 | Optical pickup device and optical element An optical pickup device includes a light source emitting a light beam having a wavelength within a range of 390 nm to 420 nm and an optical element to perform recording and/or reproducing of information of an optical disk having a protective substrate thickness d | 05/06/2008 |
| 7369481 | Optical element, aberration correcting element, light converging element, objective optical system, optical pickup device, and optical information recording reproducing device An optical system for use in an optical pickup apparatus comprises a first optical surface having a superposition type diffractive structure including a plurality of ring-shaped zones which are formed concentrically around an optical axis, wherein each ring-shaped z... | 05/06/2008 |
| 7366079 | Optical pickup device and optical disk drive using the same An optical pickup device includes a light source unit an optical system which leads a return light beam to a predetermined light-receiving location and includes an object lens focusing each light beam from the light source unit to a recording surface of a correspond... | 04/29/2008 |
