公开(公告)号：EP1494229A4

公开(公告)日：2008-05-07

申请号：EP03745934

申请日：2003-04-07

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： SHIONO TERUHIRO ,  YAMAMOTO HIROAKI ,  NISHINO SEIJI ,  MITSUYU TSUNEO

IPC分类号： G11B7/0045 ,  G11B7/24038 ,  G11B7/242 ,  G11B7/243 ,  G11B7/245 ,  G11B7/2533 ,  G11B7/2534 ,  G11B7/2538 ,  G11B7/2542 ,  G11B7/257 ,  G11B7/258 ,  G11B7/26 ,  G11B7/24 ,  G11B7/004 ,  G11B7/005

CPC分类号： G11B7/243 ,  B82Y10/00 ,  B82Y30/00 ,  G11B7/00455 ,  G11B7/24038 ,  G11B7/251 ,  G11B7/2533 ,  G11B7/2534 ,  G11B7/2538 ,  G11B7/2542 ,  G11B7/257 ,  G11B7/258 ,  G11B7/266 ,  G11B2007/24304 ,  G11B2007/24306 ,  G11B2007/2431 ,  G11B2007/24312 ,  G11B2007/2432 ,  G11B2007/24324

摘要： An information recording medium has a recording portion where three-dimensional information can be recorded. The recording portion includes at least one particle-containing layer (recording layer or a recording auxiliary layer) containing particles absorbing at least a part of light having a predetermined wavelength and substantially transparent to a recording light and a reproducing light having a wavelength longer than the predetermined wavelength and a particle holding material substantially transparent to the recording and reproducing lights. The mean particle size of the particles is preferably shorter than the wavelengths of the recording and reproducing lights.

公开(公告)号：EP1304687A4

公开(公告)日：2007-07-11

申请号：EP01941234

申请日：2001-06-25

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： YAMAMOTO HIROAKI ,  KOMMA YOSHIAKI ,  KADOWAKI SHIN-ICHI ,  MIZUNO SADAO

IPC分类号： G02B5/18 ,  G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G02B5/30

CPC分类号： G02B5/1833 ,  G02B5/1823 ,  G02B27/4238 ,  G02B27/4255 ,  G02B27/4261 ,  G11B7/0901 ,  G11B7/0943 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： A light beam reflected off an information medium is split, by means of a diffraction optical system, into a first diffracted light and a second diffracted light which is not the complex conjugate wave of the first diffracted light at a specified energy distribution ratio. The first diffracted light is directed to a first photodetector (195) and used for reading out data information recorded on the information medium while the second diffracted light is directed to second and third photodetector (194, 195) and used for obtaining a servo error signal. Since the area of the first photodetector in an optical head can be decreased, a data signal can be reproduced at a high rate. Furthermore, the first photodetector is insusceptible to stray light and S/N ratio is enhanced because the number of head amplifiers required for data signal detection is decreased.

公开(公告)号：EP1170840A4

公开(公告)日：2006-09-13

申请号：EP01904328

申请日：2001-02-07

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： ITO TATSUO ,  KADOWAKI SHIN-ICHI ,  KAMEI TOMOTADA ,  YAMAMOTO HIROAKI ,  KOMMA YOSHIAKI

IPC分类号： G11B7/00 ,  G11B7/125 ,  H01S5/042 ,  H01S5/0683 ,  H01S5/40

CPC分类号： G11B7/127 ,  G11B7/126 ,  G11B2007/0006 ,  H01S5/042 ,  H01S5/0683 ,  H01S5/4025 ,  H01S5/4087

摘要： To provide a laser driving apparatus which is inexpensive and has high reliability in spite of using a plurality of light sources, since a multi - wavelength light source is required for treating different kinds of optical disks such as CD, DVD or the like. In a two - wavelength LD apparatus including: a semiconductor laser 1a; a semiconductor laser 1b; and a photo detector 2, optical outputs of the semiconductor lasers 1a, 1b are controlled by APC circuits 6a, 6b on the basis of respective voltage values of variable resistors 4a, 4b connected in series to the photo detector 2. Alternatively, in the two - wavelength LD apparatus including: the semiconductor laser 1a; the semiconductor laser 1b; and the photo detector 2, the optical outputs of the semiconductor 1a, 1b are controlled by the APC circuits 6a, 6b on the basis of respective intermediate potentials of variable resistors 4a, 4b connected in parallel with the photo detector 2.

公开(公告)号：EP1630599A4

公开(公告)日：2008-10-29

申请号：EP04735114

申请日：2004-05-27

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： SHIONO TERUHIRO ,  YAMAMOTO HIROAKI ,  NISHINO SEIJI ,  ITO TATSUO

IPC分类号： G11B7/24 ,  G03C1/72 ,  G03C1/73 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/135

CPC分类号： G11B7/245 ,  B82Y10/00 ,  B82Y30/00 ,  G11B7/00455 ,  G11B7/246 ,  G11B7/25 ,  G11B7/251 ,  G11B7/2538 ,  G11B2007/0013 ,  Y10T428/21

摘要： An information recording medium having a recording portion (3) where information is recorded/reproduced when a recording/reproducing light is applied. The recording portion (3) contains a first phosphor which absorbs a first light of wavelength λ1/n where λ1 is the wavelength of the recording light and emits a second light of wavelength longer than that of the first light and a photosensitive material of photon mode which absorbs the second light and its optical constant varies. The n-photon absorption sensitivity to the recording light for the first phosphor is larger than the n-photon absorption sensitivity to the recording light for the photosensitive material where n is two or more integer.

公开(公告)号：EP1327977A4

公开(公告)日：2008-03-05

申请号：EP01972724

申请日：2001-10-09

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： YAMAMOTO HIROAKI ,  KADOWAKI SHIN-ICHI

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/257 ,  G11B7/258 ,  G11B7/24

CPC分类号： G11B7/24038 ,  B82Y10/00 ,  G11B7/004 ,  G11B7/00454 ,  G11B7/00455 ,  G11B7/1275 ,  G11B7/1356 ,  G11B7/252 ,  G11B7/259 ,  G11B2007/0013 ,  G11B2007/25706 ,  G11B2007/2571 ,  G11B2007/25715 ,  G11B2007/25716

摘要： A first recording layer and a second recording layer among a plurality of recording layers have a recording film and a reflection control film composed of silver oxide, and the reflection control film is interposed between dielectric films. The reflection control film utilizes heat generated from the recording film by light irradiation, thereby forming a high-reflection region in a portion at a temperature equal to or higher than a threshold temperature for forming a high-reflection region. Thus, an optical loss in the portions other than a recording layer to be recorded/reproduced is reduced, whereby a light efficiency is enhanced.

公开(公告)号：EP1553577A4

公开(公告)日：2007-11-21

申请号：EP03808873

申请日：2003-09-01

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： SHIONO TERUHIRO ,  YAMAMOTO HIROAKI ,  NISHINO SEIJI ,  MITSUYU TSUNEO ,  ITO TATSUO

IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/24 ,  G11B7/243 ,  G11B7/26

CPC分类号： G11B7/243 ,  B82Y10/00 ,  G11B7/00454 ,  G11B7/24038 ,  G11B7/266 ,  G11B2007/24304 ,  G11B2007/2432

摘要： An information recording medium comprising recording zones capable of three-dimensional information recording, the recording zones (3) comprising at least one recording layer (1a-1f) containing titanium oxide. The titanium oxide is preferably a titanium oxide of at least one of anatase and brookite types. The recording layer (1a-1f) may consist substantially of titanium oxide or may comprise titanium oxide and a low-refractive-index material whose refractive index is lower than that of titanium oxide.

公开(公告)号：EP1515322A4

公开(公告)日：2007-11-07

申请号：EP03733074

申请日：2003-05-26

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： YAMAMOTO HIROAKI ,  SHIONO TERUHIRO ,  ITO TATSUO ,  NISHINO SEIJI ,  MIZUNO SADAO

IPC分类号： G11B7/004 ,  G11B7/0045 ,  G11B7/243 ,  G11B7/26 ,  G11B7/24

CPC分类号： G11B7/243 ,  G11B7/00455 ,  G11B7/24038 ,  G11B7/257

摘要： An optical recording medium which is a multilayer optical recording medium including a plurality of recording layers and records or reproduces information by the irradiation of light having a wavelength of lambda 0. At least one recording layer out of a plurality of recording layers includes a variable absorption film. The variable absorption film contains a material in which an electron energy has a band structure, and the absorption end of an absorption spectrum moves toward a longer wavelength side with a rise in temperature when light is absorbed by transition between electron bands, has a first absorptance to light having a wavelength of lambda 0 when a film temperature is a first temperature (application environment temperature), and has a second absorptance higher than the first absorptance to light having a wavelength of lambda 0 when a film temperature is a second temperature higher than the first temperature.

公开(公告)号：EP1455351A4

公开(公告)日：2007-06-06

申请号：EP02775308

申请日：2002-10-09

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： YAMAMOTO HIROAKI ,  SHIONO TERUHIRO

IPC分类号： G11B7/005 ,  G11B7/257 ,  G11B7/24

CPC分类号： G11B7/252 ,  B82Y10/00 ,  G11B7/005 ,  G11B7/1356 ,  G11B7/24 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316 ,  G11B2007/25706 ,  G11B2007/2571 ,  G11B2007/25715 ,  G11B2007/25716

摘要： An optical information reproducing method of the present invention is used for an optical recording medium (1). The optical recording medium (1) includes a recording layer (15) containing information and a mask layer (13) that is located close to the recording layer (15) and includes a nonlinear optical material whose optical properties are changed in accordance with incident light intensity. The method includes irradiating the optical recording medium (1) with convergent light that is polarized in a first direction and dividing reflected light from the optical recording medium (1) into a first polarized component that is polarized in the first direction and a second polarized component that is polarized in a second direction perpendicular to the first direction. The second polarized component is used to detect a reproduction signal.

公开(公告)号：EP0792012A3

公开(公告)日：1998-05-27

申请号：EP97102874

申请日：1997-02-21

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： ASANO HIROAKI ,  YAMAMOTO HIROAKI ,  FUJITO KATSUYUKI

IPC分类号： H03F3/08 ,  H03F3/45 ,  H04B10/69 ,  H03F1/00 ,  H04B10/158

CPC分类号： H03F3/08 ,  H03F3/45475 ,  H03F3/45982 ,  H04B10/6933

摘要： A differential amplifier (11) differentially amplifies an inputted burst signal. A first maximum value holding circuit (12) detects and holds the maximum value of an inverting output of the differential amplifier (11). A second maximum value holding circuit (13) detects and holds the maximum value of a non-inverting output of the differential amplifier (11). A differential amplifier (14) differentially amplifies outputs of the first and second maximum value holding circuits (12) and (13). An output of the differential amplifier (14) is fed to a differential amplifier (15) as a reference input. The differential amplifier (15) differentially amplifies the non-inverting output of the differential amplifier (11) with the reference input from the differential amplifier (14) used as a basis. The first and second maximum value holding circuits (12) and (13) have the same circuit design, and the sizes and the directions of variations respectively occurring inside thereof are the same. The differential amplifier (14) is so constructed that the amplification factor thereof is set to 0.5, and a variation occurring inside thereof is the same as a variation occurring inside of the differential amplifier (11). Respective output variations occurring in the maximum value holding circuits (12) and (13) due to a temperature variation and a power supply voltage variation are canceled by providing differential amplification in the differential amplifier (14). At this time, an output variation occurring in the differential amplifier (11) is also canceled. Therefore, an output variation occurring in the differential amplifier (14) is made equal in value to the output variation occurring in the differential amplifier (11), so that the same variation as a signal input is superimposed on the reference input fed to the differential amplifier (15). Consequently, a reference input accurately following the DC level of the signal input can be fed to the differential amplifier (15), whereby stable amplification can be always provided.

公开(公告)号：EP1087385A4

公开(公告)日：2003-06-04

申请号：EP00908049

申请日：2000-03-14

申请人： MATSUSHITA ELECTRIC IND CO LTD

发明人： MIZUNO SADAO ,  YAMAMOTO HIROAKI ,  HAYASHI HIDEKI ,  ANZAI JOUJI ,  KAMEI TOMOTADA

IPC分类号： G11B7/1374 ,  G02B3/08 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135 ,  G02B5/32 ,  G02B13/00

CPC分类号： G11B7/1367 ,  G02B3/08 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/13922 ,  G11B7/1398 ,  G11B2007/0006

摘要： An optical head which reproduces information recorded on an optical disc whose disc substrate thickness is t1 (0.6 mm) or t2 (1.2 mm) by using a dual-wavelength light beam and using one object lens. A convergent device is composed of a center part whose optimum-designed substrate thickness is t1 x 0.6-t1 and an outer circumference part whose optimum-designed substrate thickness is 0.6 mm. By providing a difference in level in the convergent device, information can be recorded/reproduced onto/from both an information medium with a disc substrate thickness of t1 and an information medium with a disc substrate thickness of t2 in a state with few side lobes. Or, a difference in level is provided in an object lens and an optical distance (L2) between a 2nd light emission source and a condensation optical system is selected to be 80 - 95 % of a distance (L1) between a 1st light emission source and the condensation optical system. Or, only a light with a 1st wavelength is shielded or diffracted in a circular belt shape.