# US 5,703,739 A · Composite magnetic head

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- Number: US 5,703,739 A
- Document ID: US5703739A
- Status: Granted
- Kind: A
- Application number: 08/261,239
- Filed: 1994-06-14
- Granted: 1997-12-30
- Earliest claimed: 1991-07-23
- Assignees: NEC Corporation
- Inventors: Yuuichi Hayakawa; Shinichi Saitoh; Isao Matsuzaki; Masayoshi Kayama
- Web page: https://patentgrep.com/patent/US5703739A

## CPC

- G11B 5/10: Structure or manufacture of housings or shields for heads
- G11B 5/105: Mounting of head within housing {or assembling of head and housing (G11B5/3103 takes precedence)}
- G11B 5/4886: {relative to rotating disc}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A composite magnetic head for use in a magnetic disk drive and having a higher core and a lower core assigned to high track density and low track density, respectively. A single magnetic bar is interposed between the higher and lower cores. A single spring having a generally U-shaped section sandwich the cores and magnetic bar from both sides. As a result, the magnetic bar is stably held in close contact with the cores.

## Claims

### Claim 1

A composite magnetic head for recording and reproducing data from a magnetic disk, comprising:
a slider made up of two parts;
a higher core provided in one of said two parts of said slider for recording and reproducing data from a magnetic disk having a high track density;
a lower core also provided in the one part of said slider and adjoining said higher core for recording and reproducing data from a magnetic disk having a low track density, said higher core and said lower core adjoining each other said higher core and said lower core each comprising a plurality of legs; and
a magnetic bar interposed between said legs of said higher core and said lower core wherein said magnetic bar contacts side surfaces of said legs of said higher core and side surfaces of said legs of said lower core to form a closed magnetic path.

### Claim 2 (depends on 1)

A magnetic head as claimed in claim 1 further comprising a spring having a generally U-shaped section and sandwiching said legs of said higher core and said legs of said lower core from both sides.