Recording/reproduction head and device

A playback device and playback technology, applied in the fields of recording/playback devices and recording devices

Inactive Publication Date: 2006-06-07
长 康雄 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the thermal fluctuation of magnetically recorded information and the presence of Bloch walls in the portion where the code is reversed, even using patterned media to overcome these phenomena, the recording density can only be limited to 1 Tbit / inch 2

Method used

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  • Recording/reproduction head and device
  • Recording/reproduction head and device
  • Recording/reproduction head and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0057] (First embodiment of recording / reproducing head)

[0058] A first embodiment of the recording / reproducing head of the present invention will be described below with reference to FIG. 1(a) and FIG. 1(b). Fig. 1(a) is a plan view of the first embodiment, and Fig. 1(b) is a sectional view of A1-A1 in Fig. 1(a).

[0059]As shown in FIG. 1, the recording / reproducing head 1 has: a probe 11 consisting of a recording / reproducing electrode 11a, an insulating layer 13 located on the top end of the recording / reproducing electrode 11a, and a resistance member located on the insulating layer 13. 14; and a return electrode 12, located around the probe 11.

[0060] The probe 11 has: (i) a recording / reproducing electrode 11a, which is composed of a conductive member, and whose top end, that is, a portion facing the phase-change material 16, is substantially spherical and has a predetermined radius; (ii) an insulating layer 13, which is located on top of the recording / reproducing elec...

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Abstract

A phase change recording / playback head (1) comprising: a probe (11) consisting of a recording / playback electrode (11a), an insulating layer (13) arranged on top of the recording / playback electrode (11a) ) and a resistor (14) arranged on the insulating layer (13); and a return electrode (12), which is arranged around the probe (11). At the time of recording, a voltage corresponding to recording data is applied to a resistor (14) to change the phase-change recording medium from a crystalline state to an amorphous state. At the time of reproduction, the FM modulation frequency of the oscillator oscillating according to the capacitance corresponding to the dielectric constant of the crystalline state and the amorphous state is demodulated to thereby reproduce data with a high SN ratio.

Description

technical field [0001] The present invention relates to a recording / reproducing head for recording data in a phase change recording medium using a phase change material, or for reproducing data recorded in a phase change recording medium, and to a recording device, a reproducing device and Recording / playback device. Background technique [0002] As random access type high-density and large-capacity recording / reproducing devices, optical disc devices and HDD (Hard Disk Drive) devices are currently known. Furthermore, the inventors of the present invention have recently proposed a recording / playback technique using SNDM (Scanning Nonlinear Dielectric Microscope) for nanoscale analysis of dielectric recording media. [0003] Optical recording uses an optical pickup with a laser as a light source. Data is recorded by forming pits in an organic die or one or more layers of phase change material formed on the disc. Data is reproduced by using a difference in reflectance dependi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B9/06G11B9/00G11B9/07G11B11/08
CPCB82Y10/00G11B9/075G11B9/14G11B9/1409G11B11/08G11B9/06
Inventor 长康雄尾上笃
Owner 长 康雄
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