| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369112110 | Sectioned optical element | 11 |
| 369112120 | Plural diffractive sections | 9 |
| 20090268583 | INFORMATION RECORDING DEVICE AND INFORMATION REPRODUCING DEVICE - An information recording/reproducing device includes a radiation light source | 10-29-2009 |
| 20090268584 | Optical Pickup Apparatus And Optical Disc Apparatus Using Same - An optical pickup apparatus is provided with a dividing element having a plurality of regions. The dividing element is capable of dividing a light flux reflected by the optical disc into a plurality of light fluxes having different outgoing directions. Each region of the dividing element and light receiving parts of a light detector are structured such that when a target information recording layer of the optical disc is brought into focus, a light flux reflected from the target information recording layer is focused on the light receiving parts of the light detector, and a light flux reflected from other information recording layer than the target information recording layer is not irradiated onto the light receiving parts of the light detector. | 10-29-2009 |
| 20100149952 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS USING THE SAME - An optical pickup device and an optical disc apparatus which is capable to reduce variation of a detected signal due to unnecessary beam and detect a signal with high quality are provided. Amplification of sup PP signals necessary to produce a tracking error signal by a DPP method can be realized by an amplification factor smaller than a spectral radio of main and sub beams by the following structure. The optical pickup device includes an optical element having an area in which part of beam is diffracted and light shielding zones or insensitive zones having predetermined width are formed on center division lines in the light receiving planes of sub beams of the optical detector. The shape of a diffraction area is optimized to the shift amount of objective lens. The width of the light shielding zones or insensitive zones is optimized from the shift amount of objective lens and the shape of the diffraction area. With such structure, it is possible to suppress interferential disturbance component due to unnecessary light produced in sub PP signals from being amplified by an amplifier and the tracking error signal having less waveform fluctuation can be detected stably and satisfactorily even upon reproduction/recording of a multi-layered disc. | 06-17-2010 |
| 20100157778 | OPTICAL PICKUP DEVICE - An optical pickup device includes a diffraction grating | 06-24-2010 |
| 20100177618 | OPTICAL PICKUP DEVICE - An optical pickup device includes a diffraction grating | 07-15-2010 |
| 20120314556 | OPTICAL PICKUP DEVICE AND OPTICAL DISC APPARATUS - An optical pickup device includes a laser diode for emitting a laser beam, an objective lens for collecting the light beam emitted from the laser diode and irradiating an optical disc with the collected light beam, a diffraction element for making the light beam reflected from the optical disc diverge, and a detector having a plurality of detection parts for receiving the diverging light beams caused by the diffraction element. The diffraction element has first, second, and third divided areas, wherein a 0th-order diffracted light from the first divided area, the second divided area, and the third divided area is detected by at least four divided detection parts; and at least two detection parts for detecting the light beam diffracted at the first divided area into first or higher diffraction order are aligned in a direction generally perpendicular to the track of the optical disc. | 12-13-2012 |
| 20120314557 | OPTICAL PICKUP DEVICE - In an optical pickup device for both CD and DVD disk media using a two-wavelength laser diode ( | 12-13-2012 |
| 20140241142 | OPTICAL PICKUP AND OPTICAL INFORMATION STORAGE SYSTEM INCLUDING THE SAME - Provided are an optical pickup and an optical information storage system including the same. The optical pickup includes a diffracting element that splits incident light into main light and a plurality of sub light. The diffracting element has at least three regions including first through third regions. A second region is disposed between a first region and a third region and has a phase difference from the first and third regions. The optical pickup detects a tracking error signal by using light diffracted by the diffracting element. | 08-28-2014 |
| 20140293766 | OPTICAL ELEMENT AND OPTICAL HEAD APPARATUS INCLUDING THE SAME - An optical element having compatibility among two or more wavelengths and having an excellent converging performance for light with each wavelength, and an optical head apparatus using the optical element are provided. An optical element according to the present disclosure has a first region including an optical axis and a second region formed around the outer circumference of the first region. The first region and the second region respectively have a first diffraction structure and a second diffraction structure each cyclically formed on an aspheric surface and having a step-like cross section. In the first region, the number of steps included between top portions of the first diffraction structure is different from the number of steps included between the optical axis and a top portion that is closest to the optical axis in the first diffraction structure. | 10-02-2014 |
| 369112130 | Lens section | 2 |
| 20100110861 | OBJECTIVE LENS AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - A resin objective lens having a numerical aperture NA≧0.75. The objective lens satisfies a condition: | 05-06-2010 |
| 20100142356 | 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 ( | 06-10-2010 |
