| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369112250 | Sectioned element | 8 |
| 20080259776 | Optical disc recording and reproducing apparatus - An optical pickup has a photo detector which is divided into first, second, third and fourth quadrants, receives a laser beam reflected from an optical disc via an objective lens, and outputs first, second, third and fourth detection signals from the respective quadrants. A system controller controls a memory to store levels (A, B, C and D) of the first, second, third and fourth detection signals after a focus servo section performs a focus operation by shifting the objective lens in a direction perpendicular to the optical disc surface, and then, calculates a ratio of ((A+D)/(B+C)) in a radial direction of the optical disc. The system controller controls the tracking servo section to perform a tracking operation to shift the objective lens in the radial direction based on a correction table which represents a relationship between correction amount of the lens shift and the calculated ratio ((A+D)/(B+C)). | 10-23-2008 |
| 20100054108 | OBJECTIVE LENS FOR OPTICAL PICKUP DEVICE, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS - An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light beam emitted from the light source to an information recording surface of an optical information recording medium, and the optical pickup device is capable of recording and/or reproducing information by converging the light beam emitted from the light source to the information recording surface of the optical information recording medium with the converging optical system, the objective lens being a plastic single lens and satisfying following formulas when NA is an image-side numerical aperture required for recording and/or reproducing information to the optical information recording medium and f (mm) is a focal length of the objective lens. Even in a plastic single lens having a high NA, thermal aberration does not increase excessively and in a plastic single lens of a refraction type, thermal aberration within the temperature range of practical use in an optical pickup device is suppressed within an allowable range. | 03-04-2010 |
| 20120327756 | OBJECTIVE LENS, LENS MANUFACTURING METHOD, AND OPTICAL DRIVE DEVICE - An objective lens includes as a front lens disposed on the most objective side: a front lens configured to have a laminated structure wherein a first thin film of which the permittivity is negative, and a second thin film of which the permittivity is positive are mutually laminated, and also the films are formed so as to have a rectangular shape protruding on a side to which light from a light source is input, as a cross-sectional shape thereof. | 12-27-2012 |
| 20140078877 | DETECTION LENS, LENS UNIT, OPTICAL PICKUP DEVICE, OPTICAL DISC DEVICE, COMPUTER, OPTICAL DISC PLAYER AND OPTICAL DISC RECORDER - The present application discloses detection lens provided with lens portion and flange portion including first surface connected to lens portion and second surface opposite to first surface. Flange portion includes base along optical axis of lens portion, and first to fourth projections projecting from base. First and second projections are point-symmetric around optical axis. Third and fourth projections are point-symmetric around optical axis. Flange portion excludes projection extending beyond second surface. First projection includes first intersecting surface which intersects with first axis. Second projection includes second intersecting surface which intersects with first axis. Third projection includes third intersecting surface which intersects with second axis. Fourth projection includes fourth intersecting surface which intersects with second axis. First distance between first and second intersecting surfaces is longer than second distance between third and fourth intersecting surfaces. | 03-20-2014 |
| 369112260 | Plural lens sections | 4 |
| 20090285080 | PICKUP LENS WITH PHASE COMPENSATOR AND OPTICAL PICKUP APPARATUS USING THE SAME - A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t | 11-19-2009 |
| 20100080106 | OPTICAL PICKUP APPARATUS AND OPTICAL DISC APPARATUS - An optical pickup apparatus changes a propagation direction of luminous fluxes, out of a laser light reflected by a disc, in four luminous flux regions set about a laser optical axis so as to mutually disperse these luminous fluxes. A signal light region in which only a signal light is present appears on a detection surface of a photodetector. A plurality of sensors for a signal light are placed at positions irradiated with the signal light within the region. When an arithmetic process is performed on a detection signal outputted from each sensor, a DC component occurring in a tracking error signal is suppressed. | 04-01-2010 |
| 20100118688 | Optical pickup lens - An optical pickup lens for focusing a light beam from a laser light source on an optical information recording medium is a single lens. The optical pickup lens has two surfaces, and a surface R | 05-13-2010 |
| 20150009790 | OBJECTIVE LENS AND OPTICAL PICKUP DEVICE | 01-08-2015 |
