Sony Corporation

Midori Kanaya

Kenji Yamamoto

Noriaki Nishi

Katsutoshi Sato

Katsuhiro Seo

Takashi Kobayashi

Kazuhiko Nemoto

Hiroaki Yukawa

Tamotsu Ishii

Shinya Makita

Noriyuki Mori

Provided is an optical pickup including: a light-source emitting a light-beam; an objective lens collecting the light-beam on a desired recording layer among one or two recording layers or more installed in an optical disc and where spirally- or concentrically-shaped tracks are formed; a lens-moving unit moving the objective lens in a tracking direction toward at least an inner-circumference or outer-circumference side; a light splitting device splitting a reflected light-beam into reflected light-beams and propagating the light-beams; a light-detecting device generating central, inner-circumference-side, and outer-circumference-side light-detecting signals according to received light amounts thereof by central, inner-circumference-side, and outer-circumference-side light-detecting areas, receiving central, inner-circumference-side, and outer-circumference-side portions of an image of the reflected light-beam in the radial direction and allowing a signal processing unit to generate a tracking error signal by using the inner-circumference-side and outer-circumference-side-light-detecting signals, being added with a product of a predetermined coefficient and the central-light-detecting signal.

Optical pickup and optical disc apparatus

An optical integrated device includes a light source; a light splitting-and-guiding section that splits a reflected light beam into two end light beams, a connection light beam, and a residual light beam, and guides the two end light beams and the connection light beam in directions different from a direction of the residual light beam; and a light receiving section that receives the two end light beams and the connection light beam with photodetection devices divided, in the tangential direction, into at least two regions within a range in which the connection light beam is incident, receives the residual light beam with photodetection devices divided, in the tangential direction, into regions having widths corresponding to portions on which the two end light beams are incident, and outputs a detection signal in accordance with an amount of light received with each of the photodetection devices.

Optical integrated device, method for detecting light, optical pickup, and optical disc apparatus

An optical pickup including a light source unit having a first radiating unit for radiating a light beam of a first wavelength, a second radiating unit for radiating a light beam of a second wavelength and a third radiating unit for radiating a light beam of a third wavelenght, a collimator lens having different focal lengths dependent on the first to third wavelengths, and an objective lens for condensing light beams, radiated from the first to third radiating units, on an information recording surface of an optical disc, and a recording and/or reproducing apparatus employing the optical pickup, are disclosed. The optical pickup and the recording and/or reproducing apparatus are used for recording and/or reproducing the information for plural sorts of the information recording medium of different formats. Certain components of the optical pickup are used in common for the different light beams to reduce the size of the device as well as to correct the spherical aberration.

Optical pickup for three different types of optical discs and recording and/or reproducing apparatus using same

An optical pickup includes a diffracting element having a plurality of regions for dividing the laser light emitted from the light-emitting element into a main beam and pairs of first, second, third, and fourth sub-beams. When the first to fourth sub-beams form first to fourth sub-spots, respectively, in that order along a radial direction on a recording surface of an arbitrary kind of disc-shaped recording medium which does not have the largest track pitch, n is a natural number, and the track pitch is Pa, the distance Dabetween the first and second sub-spots is approximately (2n&#x2212;1)&#xd7;Pa/2, the distance Dabetween the third and fourth sub-spots is approximately (2n&#x2212;1)&#xd7;Pa/2, the distance Dabetween the first and third sub-spots is approximately (2n&#x2212;1)&#xd7;Pa, and the distance Dabetween the second and fourth sub-spots is approximately (2n&#x2212;1)&#xd7;Pa.

Optical pickup and disc drive apparatus

An optical pickup includes a first optical system for collecting first laser light emitted from a first laser light source onto a first disk, and guiding reflected light from the first disk to a photoreceptor; a second optical system for collecting second laser light emitted from a second laser light source onto a second disk, and guiding reflected light from the second disk to a photoreceptor; a second objective lens for collecting the second laser light onto the second disk and receiving the reflected light from the second disk, the second objective lens being movable in a radial direction passing through the center of the second disk, and a first objective lens for collecting the first laser light onto the first disk and receiving the reflected light from the first disk, the first objective lens being disposed offset from the radial direction and adjacently to the second objective lens.

Optical pickup and optical disk apparatus

An optical pickup housing an optical system including a collimator lens for converting laser light incident on the collimator lens into an approximately parallel light beam, and an objective lens for receiving the laser light converted into the approximately parallel light beam and focusing the laser light onto a recording medium, the optical pickup having a light source configured to emit a plurality of laser beams of different wavelengths; a magnification conversion element arranged between the collimator lens and the objective lens; a bypass optical path configured to bypass the magnification conversion element; and optical path selection unit configured to select, according to a wavelength of each of the plurality of laser beams, whether each of the plurality of laser beams is to pass through an optical path passing through the magnification conversion element or through the bypass optical path.

Disclosed is a light divergence angle limiting apparatus for improving color purity and displaying a high-quality image by blocking unnecessary color rays except for a predetermined color ray. A divergence angle of at least one of a plurality of color rays is limited in consideration of light emission characteristics of a light source so that color rays (for example, B and G rays) different from a predetermined color ray (for example, R ray) do not enter a pixel corresponding to the predetermined color ray by using a light blocking plate provided as a light divergence angle limiting apparatus.

Growing community of inventors

Tokyo, Japan

Midori Kanaya