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Kamigama
Takehiro Kamigama, Tokyo JP
| Patent application number | Description | Published |
|---|---|---|
| 20100191896 | Solid state drive controller with fast NVRAM buffer and non-volatile tables - Systems and methods for a SSD controller enabling data transfer between a host and flash memories have been achieved. A major component of the SSD controller is a non-volatile buffer memory, which interfaces fast disk drive protocols and slow write and read cycles of NAND flash. Preferably MRAM or Phase Change RAM can be used for the buffer memory. Non-volatile tables can also be implemented for storing dynamic logical to physical address translation, defective sector information and their spare sectors and/or SSD configuration parameters. data are kept in a buffer memory when the buffer memory is not powered | 07-29-2010 |
Takehiro Kamigama, Hong Kong CN
| Patent application number | Description | Published |
|---|---|---|
| 20090045162 | THIN FILM MAGNETIC HEAD AND MANUFACTURING METHOD THEREOF - A thin film magnetic head has a configuration in which a main magnetic pole film having a magnetic pole end portion on a medium opposing surface (ABS) side facing a magnetic disk, a write shield film facing the magnetic pole end portion so as to form a recording gap film on the medium opposing surface side, and a thin film coil wound around at least a part of the write shield film are laminated. Further, the thin film magnetic head has an upper yoke magnetic pole film whose size is larger than that of the main magnetic pole film at a part more distant from the ABS than the recording gap film, and this upper yoke magnetic pole film is bonded to the side of the main magnetic pole film close to the thin film coil. In the upper yoke magnetic pole film, an end portion on the ABS side is retracted in a direction apart from the ABS in accordance with an increase in film thickness which is measured from the surface of the main magnetic pole film. | 02-19-2009 |
| 20100118438 | THIN-FILM MAGNETIC HEAD, METHOD OF MANUFACTURING THE SAME, HEAD GIMBAL ASSEMBLY AND HARD DISK DRIVE - A thin-film magnetic head is manufactured as follows. First, a base insulating layer having a magnetic pole forming depression sunken into a form corresponding to the main magnetic pole layer is formed, a stop film for CMP is formed such as to fill the magnetic pole forming depression, and then a magnetic layer is formed on the stop film. Next, the magnetic layer is separated by forming a separation groove substantially surrounding the magnetic pole forming depression on the outside thereof, and thus separated magnetic layer is formed with a cover insulating film adapted to cover the whole upper face. The surface is polished by CMP until the stop film is exposed, so that the part of magnetic layer remaining on the inside of the magnetic pole forming depression is used as the main magnetic pole layer. Further, a recording gap layer, a write shield layer, and a thin-film coil are formed. | 05-13-2010 |
Takehiro Kamigama, Shatin CN
| Patent application number | Description | Published |
|---|---|---|
| 20090040655 | Thin-film magnetic head structure, method of manufacturing the same, and thin-film magnetic head - A method of manufacturing a thin-film magnetic head structure comprises the steps of preparing an insulating layer | 02-12-2009 |
| 20090042143 | Thin-film magnetic head structure, method of manufacturing the same, and thin-film magnetic head - A method of manufacturing a thin-film magnetic head structure comprises the steps of preparing an insulating layer | 02-12-2009 |