专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JPH11328720A DEVICE TO READ FROM AND WRITE TO OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH11328720A
公开(公告)日：1999-11-30
申请号：JP10131199
申请日：1999-04-08
申请人： THOMSON BRANDT GMBH
发明人： DANG LIEU KIM , DIETRICH CHRISTOPH , RICHTER HARTMUT , HEINZ-JOERG SCHROEDER
IPC分类号： G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To obtain the device to conduct a reading from and a writing to the optical recording medium in which the interference effect on the focus error signals, that are the signals to pull out optical detector signals, or track error signals is reduced. SOLUTION: The device has a scanning beam generating means 1, which has a focusing means, and a photodetector 11 which includes at least two detector regions and receives O order and 1st-order diffracted beams from a recording medium. Moreover, the device is provided with a beam dividing means 4 which divides the optical spot on the photodetector 11 into two separate partial spots.

2. 发明专利

JPH11250476A CORRECTING METHOD OF TRACKING ERROR SIGNAL FOR DISK RECORDING MEDIUM AT THE TIME OF SCANNING BY LIGHT 失效
公开(公告)号：JPH11250476A
公开(公告)日：1999-09-17
申请号：JP35922098
申请日：1998-12-17
申请人： THOMSON BRANDT GMBH
发明人： RAPP STEFAN , HEINZ-JOERG SCHROEDER , ZUCKER FRIEDHELM
IPC分类号： G11B11/10 , G11B7/09 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To obtain a correcting method of a tracking error signal for a disk recording medium in scanning by light to enable evaluating a tracking error signal independently of overlapping of noise elements. SOLUTION: In the case of a MO disk, as a kerr rotation angle is very small generally, the so-called emphasis is used for processing. Thereby, double refractivity effect thermally induced on a WO disk is cause during writing processing, a noise level is produced on a tracking error signal. In this method, an optical scanner device is used for deciding light intensity from two polarization planes being perpendicular mutually. Noise elements in a tracking error signal generated by interference of polarization rotation of light is corrected by coupling an electric output signal of the scanner device. This is applied to CD audio, CD video, a CD-ROM, MO and WO.

3. 发明专利

JPH11339380A DISK DRIVE PROVIDED WITH COMPENSATION FOR ECCENTRICITY OF DISK 失效
公开(公告)号：JPH11339380A
公开(公告)日：1999-12-10
申请号：JP13407099
申请日：1999-05-14
申请人： THOMSON BRANDT GMBH
发明人： OLDERMANN KLAUS , HEINZ-JOERG SCHROEDER
IPC分类号： G11B7/095 , G11B17/028 , G11B19/20
摘要： PROBLEM TO BE SOLVED: To provide a disk driving device provided with compensation for the eccentricity of a disk. SOLUTION: This is the device for rotating a disk-shaped data carrier 1 provided with an opening around the center in a disk reproducing and/or recording device. Relating to this device, the possibility of that the rotating disk is being in the eccentric state with respect to a rotary shaft 3, is taken into consideration. By a horizontal movement means, the rotating disk and fixing means 4, 5 detachably fixing this disk are allowed to move in the rotating plane which is almost vertical to the rotary shaft 3 of the fixing means 4, 5, in the reproducing and/or recording device. The rotating disk and the fixing means 4, 5 are moved like the gyroscopic state in the reproducing device.

4. 发明专利

JPH11238237A COMPACT DUAL-WAVELENGTH OPTICAL PICKUP HEAD 失效
公开(公告)号：JPH11238237A
公开(公告)日：1999-08-31
申请号：JP31984298
申请日：1998-10-26
申请人： THOMSON BRANDT GMBH
发明人： DANG LIEU-KIM , DIETRICH CHRISTOPH , RICHTER HARTMUT , HEINZ-JOERG SCHROEDER
IPC分类号： G11B7/00 , G11B7/09 , G11B7/12 , G11B7/125 , G11B7/13 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To reduce the size of an optical pickup head without raising the manufacturing cost by providing an optical means directing light beams having first and second wavelengths which are to be emitted from first and second light sources to an optical disk and moreover providing a photodetecting device detecting reflected light beams having the first and second wavelengths which are reflected on the optical disk and another optical means directing the reflected light beams to the photodetecting means. SOLUTION: First and second light beams 4, 10 to be emitted from first and second light sources 2, 3 are directed to an optical disk 1 by the optical means. The optical means has a beam splitter 5 directing the light beams 4,10 to a collimating lens 6 while reflecting the first beam 4 and transmitting the second light beam 10, the collimating lens 6, a reflecting mirror 7 and an objective lens 8. First and second light beams 4, 10 which are reflected on the optical disk 1 are directed to a photodetecting means 11 by another optical means, which has the objective lens 8, the reflecting mirror 7 and the collimating lens 6 which are common to the optical means. Thus, most components constituting the optical means and the another optical means can be made common.

5. 发明专利

JPH1083545A DEVICE FOR READING FROM AND/OR WRITING IN OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH1083545A
公开(公告)日：1998-03-31
申请号：JP9004497
申请日：1997-03-26
申请人： THOMSON BRANDT GMBH
发明人： HEINZ-JOERG SCHROEDER , UHDE DIETMAR DIPL ING , FRITZ WEISER
IPC分类号： G11B7/085 , G11B7/00 , G11B7/09 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide a simple and compact device having a cost effect and a reliability for reading out of and/or writing in an optical recording medium having an added optical element capable of being inserted into a beam path. SOLUTION: This device is provided with a light source for generating a beam, a focusing means 18 for focusing the beam on the recording layer of an optical recording medium, an added optical element 1 being inserted into a beam path and a moving means for inserting it into or detaching from the beam path and reading out of or writing in the optical recording medium 16 is performed. The moving means is formed by a mechanical actuating element 20 arranged outside an area provided for reading from or writing in the optical recording medium 16.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式