Magnetic structure and magnetic head using the same

• US 5,883,760 A
• Filed: 03/28/1997
• Issued: 03/16/1999
• Est. Priority Date: 10/20/1992
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Yamada, Naoshi, Yoshida, Yuichi, Ohta, Hitoshi, Tanaka, Naoya, Fukumoto, Hiroshi, Oda, Takuji
• Primary Examiner(s): Letscher, George J.
• Application Number:
  US08/829,479
• Time in Patent Office: 718 Days
• Field of Search: 360/121, 360/122, 360/125, 360/126, 360/130.22, 360/106-107
• US Class Current: 360/76
• CPC Class Codes: G11B 15/12 Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams track selection by moving the magnetic head G11B5/54
• CPC Class Codes: G11B 15/62 Maintaining desired spacing between record carrier and head
• CPC Class Codes: G11B 5/00817 on longitudinal tracks only, e.g. for serpentine format recording
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time
• CPC Class Codes: G11B 5/10 Structure or manufacture of housings or shields for heads
• CPC Class Codes: G11B 5/127 Structure or manufacture of heads, e.g. inductive
• CPC Class Codes: G11B 5/17 Construction or disposition of windings
• CPC Class Codes: G11B 5/29 Structure or manufacture of unitary devices formed of plural heads for more than one track G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31
• CPC Class Codes: G11B 5/3103 Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
• CPC Class Codes: G11B 5/313 Disposition of layers
• CPC Class Codes: G11B 5/35 having vibrating elements
• CPC Class Codes: G11B 5/488 Disposition of heads G11B5/49, G11B5/52 take precedence
• CPC Class Codes: G11B 5/4893 relative to moving tape
• CPC Class Codes: G11B 5/55 Track change, selection or acquisition by displacement of the head
• CPC Class Codes: G11B 5/5504 across tape tracks
• CPC Class Codes: G11B 5/5508 Control circuits therefor G11B5/5513 takes precedence
• CPC Class Codes: G11B 5/56 with provision for moving the head support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering G11B5/52, G11B5/54, G11B5/58 take precedence
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core

Abstract

A magnetic structure and a magnetic head capable of reducing the size thereof and raising the degree of integration is disclosed which has a structure including a substrate having a plurality of ridge-like projections each having slant side-surfaces; the substrate having thereon: a first conductive passage consisting of a plurality of parallel and conductive passages each of which is formed on opposing slant surfaces of adjacent projections and on the bottom surface between the slant surfaces; a first insulating layer stacked on the first conductive passage and the substrate; a magnetic core made of magnetic material enclosed in a groove-shape recess formed by the adjacent projections and the bottom surface; a second insulating layer stacked on the magnetic core; and a second conductive passage formed on the second insulating layer to sequentially connect ends of the first conductive passage to form a helical coil, wherein the magnetic core is separated by the projection so that a plurality of coils are integrally formed on the same substrate.

Claims

1. An apparatus including a magnetic head having a plurality of magnetic head chips formed on a common substrate thereof, said apparatus comprising:

means for positioning said magnetic head chips diagonally with respect to a direction in which a magnetic recording medium is moved;

means for rotating said substrate around an axis perpendicular to a recording surface of said recording medium, wherein said substrate is rotated by said rotating means to make a magnetic gap of each magnetic head chip coincide with a respective track of said magnetic recording medium, wherein adjacent magnetic head chips coincide with immediately adjacent tracks of said magnetic recording medium.

2. The apparatus of claim 1, wherein said means for positioning comprises a first and second connecting members for securing said common substrate containing said magnetic head chips to a frame.

3. The apparatus of claim 2, wherein said means for rotating includes first and second actuators associated with said first and second connecting members, respectively, whereby activation of said first and second actuators causes movement of said first and second connecting members, respectively, in a direction generally perpendicular to said direction in which said magnetic recording medium is moved, which in turn causes rotation of said common substrate containing said magnetic head chips.

4. The apparatus of claim 3, wherein activation of both said first and second actuators causes said common substrate to move in a direction of the width of said magnetic recording medium.

5. The apparatus of claim 2, wherein said first and second connecting members are elastic.

6. The apparatus of claim 1, wherein said magnetic head chips are arranged on said common substrate in a row.

7. The apparatus of claim 1, wherein said magnetic recording medium includes a control track having control information recorded thereon, and wherein said apparatus further comprises:

means for reading said control information with one of said magnetic head chips and for identifying which one of said magnetic head chips read said control information; and

means for computing a rotation control quantity Δ

θ

_tr as a function of a distance Δ

L between said identified one of said magnetic head chips and a predetermined magnetic head chip designated for reading said control information.

8. The apparatus of claim 1, wherein said magnetic gaps of immediately adjacent magnetic head chips differ in angular orientation.

9. An apparatus including a magnetic head having a plurality of magnetic head chips formed on a common substrate thereof, said magnetic head comprising:

means for positioning said magnetic head chips diagonally with respect to a direction in which a magnetic recording medium is moved;

means for rotating said substrate around an axis perpendicular to a recording surface of said magnetic recording medium; and

means for translating said substrate in a direction of the width of said magnetic recording medium, wherein

said substrate is translated and rotated by said translating means and said rotating means to facilitate reproduction of a signal recorded on said magnetic recording medium while making a magnetic gap of each magnetic head chip coincide with a respective track of said magnetic recording medium, wherein adjacent magnetic head chips coincide with immediately adjacent tracks of said magnetic recording medium.

10. The apparatus of claim 9, wherein said means for positioning comprises a first and second connecting members for securing said common substrate containing said magnetic head chips to a frame.

11. The apparatus of claim 10, wherein said first and second connecting members are elastic.

12. The apparatus of claim 10, wherein said means for rotating includes first and second actuators associated with said first and second connecting members, respectively, whereby activation of said first and second actuators causes movement of said first and second connecting members, respectively, in a direction generally perpendicular to said direction in which said magnetic recording medium is moved, which in turn causes rotation of said common substrate containing said magnetic head chips.

13. The apparatus of claim 12, wherein said means for translating includes a third and fourth actuators, whereby activation of said third and fourth actuators causes said common substrate to move in a direction of the width of said magnetic recording medium.

14. The apparatus of claim 9, wherein said magnetic head chips are arranged on said common substrate in a row.

15. The apparatus of claim 9, wherein said magnetic recording medium has two control tracks each having control information recorded thereon, and wherein said apparatus further comprises:

means for reading said control information on said two control tracks with two of said plurality of magnetic head chips and for identifying which two of said plurality of magnetic head chips have recorded said control information; and

means for computing a translation control quantity Δ

Wer and a rotational control quantity Δ

θ

_tr as a function of a distance Δ

La between a first of said two identified magnetic head chips and a first predetermined magnetic head chip designated for reading said control information, and a distance Δ

Lb between a second of said two identified magnetic head chips and a second predetermined magnetic head chip designated for reading said control information.

16. The apparatus of claim 9, wherein said means for translating said substrate comprises a fine adjustment means for affecting a fine adjustment of said substrate in the direction of the width of said magnetic recording medium and a coarse adjustment means for affecting a coarse adjustment of said substrate in the direction of the width of said magnetic recording medium.

17. An apparatus for recording and reading information from a magnetic media comprising:

a magnetic head having a plurality of magnetic head elements arranged in a row;

first and second connecting members connected to both sides of said magnetic head for securing said magnetic head such that said row of magnetic head elements is diagonally disposed with respect to a direction in which said magnetic media is moved; and

first and second actuating members for displacing said first and second connecting members, respectively, when activated, thereby causing rotational displacement of said magnetic head;

wherein said first and second actuating members both exert force on said respective first and second connecting members in a direction generally perpendicular to said direction in which said magnetic media is moved.