# US 8,146,237 B2 · Method of manufacturing a magnetic head

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- Number: US 8,146,237 B2
- Document ID: US8146237B2
- Status: Granted
- Kind: B2
- Application number: 12/387,129
- Filed: 2009-04-28
- Published: 2009-08-20
- Granted: 2012-04-03
- Earliest claimed: 2004-11-16
- Assignees: SAE Magnetics (H.K.) Ltd.
- Inventors: Yoshiaki Ito; Osamu Fukuroi; Hiroyasu Tuchiya; Kenji Kodaka
- Web page: https://patentgrep.com/patent/US8146237B2

## CPC

- B24B 37/00: Lapping machines or devices; Accessories (B24B3/00 takes precedence)
- B24B 41/06: Work supports, e.g. adjustable steadies (B24B37/27 takes precedence)
- Y10T 29/49032: Fabricating head structure or component thereof
- Y10T 29/49037: Using reference point/surface to facilitate measuring
- Y10T 29/49041: with significant slider/housing shaping or treating
- Y10T 29/49043: Depositing magnetic layer or coating
- Y10T 29/49046: with etching or machining of magnetic material
- Y10T 29/49048: Machining magnetic material [e.g., grinding, etching, polishing]
- Y10T 29/49052: by etching
- Y10T 29/53165: Magnetic memory device
- Y10T 428/11: Magnetic recording head
- B24B: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In a magnetic head manufacturing method, a floated surface of each block having plural magnetic head elements formed and arranged on a substrate is ground and lapped in a grinding/lapping step. The grinding/lapping step contains an angle adjusting step for adjusting the angle of the floated surface of the block with reference to a magnetic-head-element formed surface of a substrate and grinding the floated surface concerned, and a finishing lapping step of lapping the floated surface at an angle adjusted in the angle adjusting step.

## Claims

### Claim 1

A method of manufacturing a magnetic head, comprising the steps of:
forming a plurality of magnetic head elements each including a reading element for reading out information recorded in a recording medium and a perpendicular magnetic recording writing element for writing information into the recording medium while arranging the magnetic head elements on a substrate;
cutting out bar-shaped blocks of the magnetic head elements thus arranged, each of the bar-shaped blocks comprising a predetermined number of the magnetic head elements;
grinding and lapping a floated surface of each of the blocks; and
cutting each of the blocks into individual magnetic head elements, wherein the grinding and lapping steps include an angle adjusting step of adjusting the angle of the floated surface of each of the blocks with respect to a surface of the substrate on which the magnetic head elements are formed and grinding the floated surface concerned and a lapping step of lapping the ground floated surface at the angle adjusted in the angle adjusting step, and
the angle adjusting step includes a step of adjusting the angle of the floated surface with respect to the magnetic-head-element formed surface on the substrate on the basis of a dimensional difference between a magnetic pole length of the writing element and a magnetic pole length of the reading element.

### Claim 2 (depends on 1)

The method of claim 1, wherein the angle is adjusted to 90°±0.3°.

### Claim 3

A method of manufacturing a magnetic head, comprising the steps of:
forming a plurality of magnetic head elements each including a reading element for reading out information recorded in a recording medium and a perpendicular magnetic recording writing element for writing information into the recording medium while arranging the magnetic head elements on a substrate;
cutting out bar-shaped blocks of the magnetic head elements thus arranged, each of the bar-shaped blocks comprising a predetermined number of the magnetic head elements;
grinding and lapping a floated surface of each of the blocks; and
cutting each of the blocks into individual magnetic head elements, wherein the grinding and lapping steps include an angle adjusting step of adjusting the angle of the floated surface of each of the blocks with respect to a surface of the substrate on which the magnetic head elements are formed and grinding the floated surface concerned and a lapping step of lapping the ground floated surface at the angle adjusted in the angle adjusting step, and
the angle adjusting step includes a step of adjusting the angle of the floated surface with respect to the magnetic-head-element formed surface on the substrate on the basis of a dimensional difference between a magnetic pole length of the writing element and a magnetic pole length of the reading element and the distance between a writing element and the reading element.

### Claim 4 (depends on 3)

The method of claim 3, wherein the angle is adjusted to 90°±0.3°.