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1. (WO2007010737) OPTICAL PICKUP DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/010737 International Application No.: PCT/JP2006/313244
Publication Date: 25.01.2007 International Filing Date: 03.07.2006
IPC:
G11B 7/135 (2006.01) ,G11B 7/09 (2006.01)
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
12
Heads, e.g. forming of the optical beam spot or modulation of the optical beam
135
Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
G PHYSICS
11
INFORMATION STORAGE
B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
08
Disposition or mounting of heads or light sources relatively to record carriers
09
with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Applicants:
パイオニア株式会社 PIONEER CORPORATION [JP/JP]; 〒1538654 東京都目黒区目黒一丁目4番1号 Tokyo 4-1, Meguro 1-chome, Meguro-ku, Tokyo 1538654, JP (AllExceptUS)
柳澤琢麿 YANAGISAWA, Takuma [JP/JP]; JP (UsOnly)
小笠原昌和 OGASAWARA, Masakazu [JP/JP]; JP (UsOnly)
Inventors:
柳澤琢麿 YANAGISAWA, Takuma; JP
小笠原昌和 OGASAWARA, Masakazu; JP
Agent:
石川泰男 ISHIKAWA, Yasuo; 〒1050014 東京都港区芝二丁目17番11号 パーク芝ビル2階 Tokyo Park Shiba Building 2F 17-11, Shiba 2-chome Minato-ku, Tokyo 1050014, JP
Priority Data:
2005-21313822.07.2005JP
Title (EN) OPTICAL PICKUP DEVICE
(FR) DISPOSITIF DE DÉTECTION OPTIQUE
(JA) 光ピックアップ装置
Abstract:
(EN) There is provided an optical pickup device capable of eliminating adjustment of position of a diffraction grating upon assembling, suppressing the fluctuation of the differential push-pull signal amplitude, and canceling the push-pull offset. The optical pickup device (200) includes a diffraction grating (230) of a special shape having two types of grating grooves arranged adjacent to each other in accordance with a groove pitch provided on the surface of the optical disc (50), the numerical aperture, the optical beam wavelength, and pitch decided according to the effective diameter when applying an optical beam to the optical disc (50). In order to suppress each push-pull signal generated by the plus and minus primary diffraction light, a reflected light of the 0-th diffraction light and the plus and minus primary diffraction light from the optical disc (50) is detected and each signal corresponding to the light reception result is outputted to a reproduction unit (150), a control unit (130), and an actuator servo circuit (140).
(FR) L’invention concerne un dispositif de détection optique capable d’éliminer tout réglage de position d’un réseau de diffraction lors de l’assemblage, de supprimer la fluctuation d’amplitude du signal symétrique différentiel et d’annuler le décalage symétrique. Le dispositif de détection optique (200) contient un réseau de diffraction (230) de forme spéciale ayant deux types de rainures en treillis adjacentes selon un pas de rainure à la surface du disque optique (50), l’ouverture numérique, la longueur d’onde de faisceau optique et le pas décidé en fonction du diamètre effectif lorsque l’on applique un faisceau optique au disque optique (50). Pour supprimer chaque signal symétrique généré par la lumière de diffraction primaire positive et négative, une lumière réfléchie de la lumière de diffraction de degré 0 et de la lumière de diffraction primaire positive et négative provenant du disque optique (50) est détectée et chaque signal correspondant au résultat de réception de lumière est envoyé vers une unité de reproduction (150), une unité de commande (130) et un circuit servo actionneur (140).
(JA)  組み立て時に回折格子の位置調整を不要にするとともに、差動プッシュプル信号振幅の変動を抑制し、かつ、プッシュプルオフセットをキャンセルすることができる光ピックアップ装置を提供すること。  本実施形態の光ピックアップ装置200は、所定の溝が設けられ、光ディスク50の盤面に設けられたグルーブピッチ、開口数、光ビームの波長および光ビームにおける光ディスク50に照射する際の有効径に基づいて定められたピッチによって並設された2種類の格子溝を備えた特殊形状の回折格子230を有し、当該±1次回折光にて生成される各プッシュプル信号がそれぞれ抑制されるように、0次回折光および±1次回折光の光ディスク50における反射光を検出して受光結果に対応する各信号を再生部150、制御部130およびアクチュエータサーボ回路140に出力するようになっている。
front page image
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
JPWO2007010737US20090129235JP4663723