Samsung Electronics Co., Ltd.

Joong-Eon Seo

Kun-Ho Cho

Chul-Woo Lee

In-sik Park

Dong-Ho Shin

Myong-Do Ro

Jang-hoon Yoo

Byung-in Ma

Seung-Tae Jung

Byeong-Ho Park

In-Oh Hwang

Yoon-Gi Kim

Chong-sam Chung

Seung-tae Jung

Jae-seong Shim

Chul-woo Lee

Pyong-yong Seong

Seok-jung Kim

Kyung-geun Lee

Jung-wan Ko

Dae-sik Kim

Byoung-ho Choi

Yong-hoon Lee

Seong-sin Joo

Dong-jin Lee

Young-min Cheong

Young-sun Seo

Tae-yong Doh

Soo-yul Jung

Byung-ryul Ryoo

Dong-seob Jang

Cheol-sung Yeon

Yong-ki Son

Dong-ho Shin

Yong-seock Yoon

In-wook Hwang

Byung-ho Choi

Yong-Moon Lee

Kun-Mo Cho

Seong-Il 2-1106 Guil Jungang Heights Apt Cho

A method of discriminating an optical disc type and an apparatus thereof. The method for an optical disc system of recording and/or reproducing an optical disc that includes an optical pickup having a laser diode, an object lens, and a light receiving device, checks a track error signal while moving the object lens to upward/downward, and discriminates an optical disc type by using the magnitude of the checked track error signal. The method and apparatus discriminate the disc type in the initial stage of focusing where the object lens moves to upward/downward.

Method of discriminating optical disc type and apparatus thereof

An optical data storage system writes or reads information with respect to an optical storage medium using an optical pickup including a solid immersion optical system or a solid immersion lens for generating a near-field and emitting a light beam. The optical storage medium includes a recording layer which is formed on a surface of an optical transmissive layer opposite to another surface of the optical transmissive layer which opposes the solid immersion optical system or solid immersion lens. The thickness of the optical transmissive layer is larger than one wavelength of the light beam. The interval between the surfaces of the solid immersion lens or solid immersion optical system and the optical transmissive layer is smaller than one wavelength of the light beam. Thus, the light beam reflected from the inside of an air gap and the inside of the optical storage medium between the air gap and the recording layer does not function as noise with respect to the light reflected from the recording layer. Also, since the thickness of a protective layer or a substrate which is an external surface of the optical storage medium can be thickened, information can be written or read with respect to the optical storage medium even when the optical storage medium has dust and/or damage.

Near-field optical storage medium and optical data storage system therefor

A method and apparatus for tracking error detection in an optical disk reproduction system. The tracking error detecting apparatus generates a tracking error signal as a difference signal of optical detection signals generated by more than two optical detectors positioned along a diagonal line from a track center and includes binarizers which binarize each output of the optical detectors, phase locked loops (PLLs) which generate respective clock signals synchronized with the outputs of each of the binarizers, a phase difference detector which detects a phase difference between the synchronized signals output from the PLLs, and low-pass filters which filter the output of the phase difference detector to output the result as the tracking error signal. The tracking error detecting apparatus generates a tracking error signal which is not dependent on the lengths of pits or marks recorded on an optical disk, enhancing the reliability of the tracking error signal.

Method and apparatus for tracking error detection in optical disk driver

A swing-arm type optical recording and reproducing apparatus and an optical disk applicable to the same. The optical disk includes a substrate having an information recording surface to record and reproduce an information signal, and a protective layer which is provided on the information recording surface and whose surface facing a slider is a flat even surface so that variations in a floating height of the slider can be reduced. The optical recording and reproducing apparatus further includes, an optical head having a light source provided at a swing arm to emit light of a predetermined wavelength; an optical path changing means provided in the optical path of the light emitted from the light source for changing the proceeding path of incident light; a collimating lens installed at the slider to preliminarily converge the light emitted from the light source and entering via the optical path changing means; an objective lens installed at the slider to converge the light which is emitted from the light source and enters via the optical path changing means to form an optical spot on the optical disk; and a photodetector to receive the light which is reflected from the optical disk and enters via the objective lens, the collimating lens, and the optical path changing means. The optical head detects an information signal and an error signal in order to reduce defocus due to variations in ambient temperature and variations in the wavelength of the light of the light source.

Optical recording and reproducing apparatus having floating swing arm and optical disk for use therewith

A tracking error signal detecting apparatus with improvement in offset due to gain characteristics and/or a difference in the depth between pits by providing an improved sectioning structure of an eight-sectional photodetector having inner and outer sectional plates, the radial widths of which vary along the tangential direction from the center of the photodetector, and a reproduction signal detecting apparatus with reduced crosstalk noise. The tracking error signal detecting apparatus can allow accurate tracking control in a high-density recording medium having relatively narrow tracks. Also, the reproduction signal detecting apparatus can correct signal distortion due to a difference between phase characteristics of detection signals of inner and outer sectional plates of a photodetector even during reproduction of an information signal from a high-density recording medium having relatively narrow tracks, thereby detecting an improved reproduction signal with greatly reduced crosstalk.

Device for reducing cross talk in signal detecting apparatus used in an optical pickup device

An error signal detection apparatus for an optical recording/reproducing system which detects a tilt error signal and/or tracking error signal, based on the phase characteristics of light reflected and diffracted from a recording medium, and a method therefor. The error signal detection apparatus includes multiple photodetectors and a circuit unit for detecting an error signal by processing detection signals generated by each photodetector The the photodetectors are arranged in a matrix wherein a row or column of the matrix is parallel to a direction corresponding to a direction of an information stream on the recording medium. A circuit unit compares the phases of the detection signals of the inner and/or outer light receiving portions arranged in the same row or of detection signals from diagonal positions on the matrix to output at least one of a tilt error signal and a tracking error signal based on the phase comparison.

Error signal detection apparatus and reproduction signal detection apparatus for optical recording/reproducing system and method therefor

A recording medium for storing attribute information in a basic recording unit and a method of identifying data using the attribute information. On the recording medium, the attributes such as sector format, tracking method, reflectivity, area type, data type, and the number of layers of a sector are stored. For digital versatile disc-recordables (DVD-Rs), digital versatile disc-rewritables (DVD-RWs) and digital versatile disc-random access memory (DVD-RAM) on which data can be recorded and reproduced a multitude of times, information is stored relating to the attributes of a sector, which is a basic recording unit. In particular, information relating to data type, which represents whether the data is rewritable data, read-only, or linking data, can be stored in data identification data (DID) areas or identification data (ID) areas, which is positioned at the fronts of the sectors for representing all information relating thereto. Using combinations of the attribute information, it can be determined whether the data is linking data, and if not linking data, whether the data is read only or rewritable. Accordingly, consistency among optical recording media of the DVD-type discs is maintained.

Recording medium for storing attribute information on basic recording unit and method of identifying data using the attribute information

An optical pickup device includes a light source for generating and emitting light, optical path changing means for changing a proceeding path of incident light, an objective lens for focusing incident light on a recording medium which has a recording surface where information is recorded and a protection layer, at the side where light is input, for protecting the recording surface, a main photodetector for detecting the information signal and/or an error signal by receiving the light reflected by the recording surface of the recording medium and passing through the objective lens and the optical path changing means, and an inclination detecting unit for detecting inclination of the recording medium by receiving the light emitted from the light source and reflected by the surface of the protection layer or the recording surface of the recording medium. Thus, since the inclination of the recording medium is detected using the light emitted from the light source and reflected by the surface of the protection layer or the recording surface of the recording medium, without an additional tilt sensor, the number of parts is reduced and the structure of the device is simplified.

Optical pickup device

An optical pickup device includes a light source for generating light, a light path changing means for changing the traveling path of incident light, an objective lens for focusing incident light to form a light spot on a recording medium and having an incidence region of a predetermined size, a tracking mirror disposed on the light path between the light path changing means and the objective lens, for reflecting incident light emitted from the light source so that the light spot traces proper track positions of the recording medium, a lens unit consisting of at least two lenses which allow the light reflected from the tracking mirror to be incident on the incidence region of the objective lens, and a photo detecting unit for receiving light reflected from the recording medium and having passed through the objective lens and the light path changing means. Since the optical pickup device performs tracking by adjusting the reflection direction of incident light by means of a tracking mirror with an objective lens fixed, a tracking error signal offset due to movement of the objective lens is not generated, thereby enabling stable tracking.

Optical pickup device capable of stable tracking

An optical recording and reproducing apparatus for adjusting a tilt of an optical pickup in accordance with an amount of jitter of a reproduction signal, a tilt adjusting method therefor, and a recording control method. The optical recording and reproducing apparatus includes an optical pickup having an object lens, a tilt adjusting unit for adjusting a tilt angle of the object lens, a jitter detecting unit for detecting an amount of jitter of a reproducing signal generated by the optical pickup from a disk, and a tilt controlling unit for minimizing the amount of jitter by feeding the amount of jitter detected by the jitter detecting unit back to the tilt adjusting unit. According to the optical recording and reproducing apparatus, there is no need for a space in which a displacement sensor detecting the tilt angle of the optical pickup faces the disk.

Optical recording and reproducing apparatus, tilt adjusting method appropriate therefor, and recording control method

An optical focusing system which uses a light beam emitted from a light source, includes a refractive surface on one side of the optical focusing system and having a first radius of curvature, a first reflection surface on the above one side, surrounding the refractive surface and having a second radius of curvature being different from the first radius of curvature, a transparent beam focusing surface on the other side of the optical focusing system, and a second reflection surface on the above other side and surrounding the beam focusing surface. The refractive surface refracts an incident light beam, the second reflection surface reflects a light beam refracted by the refractive surface toward the first reflection surface, and the first reflection surface focuses a laser light beam reflected from the second reflection surface on the beam focusing surface as a focused beam spot. The optical focusing system can be used in an optical pickup. The optical pickup uses the optical focusing system to generate, from a light beam e.g. laser light emitted from a light source, a beam spot used for recording or reading information to a recording medium. The optical pickup uses a near field effect provided by an optical focusing system according to the present invention, to allow a superior density of recording or reading. Further, the optical focusing system according to the invention can use a light beam having a beam diameter smaller than that of the laser beam used for an existing optical focusing system for forming a near field. Thus, the optical pickup according to the invention can record or read information on an optical disk having a surface recording density of 10 Gbit/inch,or more. Even if an incident light beam inclination occurs due to movement of the disk or the optical pickup, information can be recorded on or read from a disk accurately. Also, the assembly of the optical focusing system and the adjustment of the assembled optical focusing system are easily performed.

Catadioptric optical system, optical pickup and optical disk drive employing the same, and optical disk

Growing community of inventors

Uiwang, South Korea

Joong-Eon Seo