Magnetic disc device

Claim 2

A half-height magnetic disc device comprising: a base (1); four magnetic discs (4) arranged one above the other on the base (1); five head arms (6e) rotatable about a pivot (6f) for seeking motions over both surfaces of each magnetic disc (4); eight magnetic heads (5) each facing a surface of a disc (4) and each attached to an end of a head arm through springy means (8, 9); rotational drive means (6b, 6c) for swinging the head arms (6e); a main printed circuit board (7) arranged under the base (1); and, a cover (2) which covers an upper surface of the base (1).

Claim 3

A magnetic disc device according to Claim 1, wherein each magnetic head (5) comprises a slider having a slider surface (5b) and a core (5d) extending away from the slider surface (5b) and having a coil (5e) wound on it, a lead wire (5a) from the coil (5e) being taken out from an intermediate position between the ends of the core (5d).

Claim 4

A magnetic disc device according to Claim 2, wherein each of the head arms includes a groove (10) in which the lead wire (5a) is fitted and held.

Claim 5

A magnetic disc device according to any one of the preceding Claims, wherein the pivot (6f) comprises: an outer sleeve (10) to which the five head arms (6e) are secured; a stationary shaft (12) secured to the base (1) and on which the outer sleeve (10) is rotatably mounted; and, a seat (12a) on which the shaft (12) is supported on the base (1), the seat (12a) having an inclined periphery, and the outer sleeve (10) having a lower. inner annular edge inclined to face the inclined periphery of the seat.

Claim 6

A magnetic disc device according to any one of the preceding Claims, wherein the rotational drive means comprises: a sector (6d) secured to the head arm (6e); a capstan (6b) adjacent the sector (6d); and a steel belt (6c, 6d) wound around the capstan (6b), an end of the steel belt (6c, 6c') being secured to the sector (6d) to transmit rotational motion from the capstan (6b) to the sector (6d).

Claim 7

A magnetic disc device according to any one of the preceding Claims, wherein the springy means comprises: a load spring (8) secured to an end of each head arm (6e); gimbal means (9) secured to an end of the load spring (8); and a head supporting piece (9a) formed by cutting an inner area of the gimbal means (9), the supporting piece (9a) being bonded to a recess (30) on an upper side of the magnetic head (5).

Claim 8

A magnetic disc device according to any one of the preceding Claims, wherein each head arm has a counter weight portion (46) provided at a side opposite to the magnetic head (5) attaching end of it with respect to the pivot (6f).

Claim 9

A magnetic disc device comprising: a case (1, 2) having a base (1) ; a plurality of magnetic discs (4); a plurality of magnetic heads (5); a head actuator (6); a motor for driving a spindle (3) of the magnetic discs (4); a printed circuit board for driving the motor; and a main printed circuit board (7) mounting a read/write circuit for the magnetic discs (4); the magnetic discs (4), the magnetic heads (5) and the head actuator (6) being housed within the case (1, 2); and the motor, the printed circuit board for driving the motor .and the main. printed circuit board (7) being arranged outside of the base (1) of the case, characterised in that: a lead wire (5a) of the magnetic head (5) is taken from a lateral side of a coil winding (5e) core at an intermediate position between the ends of a core (5d) on which it is wound.

Claim 10

A magnetic disc device comprising: a case (1, 2) having a base (1) ; a plurality of magnetic discs (4); a plurality of magnetic heads (5); a head actuator (6); a motor for driving a spindle (3) of the magnetic discs (4); a printed circuit board for driving the motor; and a main printed circuit board (7) mounting a read/write circuit for the magnetic discs (4); the magnetic discs (4), the magnetic heads (5) and the head actuator (6) being housed within the case (1, 2); and the motor, the printed circuit board for driving the motor .and the main. printed circuit board (7) being arranged outside of the base (1) of the case, characterised in that: a lead wire (5a) of the magnetic head (5) is taken from a lateral side of a coil winding (5e) core at an intermediate position between the ends of a core (5d) on which it is wound.

Claim 11

A magnetic disc device according to Claim 8, wherein the head actuator comprises a head arm (6e) which is rotatable about a pivot (6f), the pivot comprising an outer sleeve (10) mounted on a stationary shaft (12), wherein a lower inner peripheral edge of the outer sleeve (10) is inclined, and the shaft (12) is supported on a seat (12a) which has an inclined periphery corresponding to the inclined peripheral edge of the outer sleeve (10).

Claim 12

A magnetic disc device comprising: a case (1, 2) having a base (1); a plurality of magnetic discs (4); a plurality of magnetic heads (5); a head actuator (6); a motor for driving a spindle (3) of the magnetic discs (4); a printed circuit board for driving the motor; and a main printed circuit board (7) mounting a read/write circuit for the magnetic discs (4); the magnetic discs (4), the magnetic heads (5) and the head actuator (6) being housed within the case (1, 2); and the motor, the printed circuit board for driving the motor and the main printed circuit board (7) being arranged outside of the base (1) of the case (1, 2), characterised in that: the head actuator comprises a head arm (6e) which is rotatable about a pivot (6f), the pivot (6f) comprising an outer sleeve (10) mounted on a stationary shaft (12), wherein a lower inner peripheral edge of the outer sleeve is inclined, and the shaft (12) is supported on a seat (12a) which has an inclined periphery corresponding to the inclined peripheral edge of the outer sleeve (10).

Claim 13

A magnetic disc device comprising: a case (1, 2) having a base (1); a plurality of magnetic discs (4); a plurality of magnetic heads (5); a head actuator (6); a motor for driving a spindle (3) of the magnetic discs (4); a printed circuit board for driving the motor; and a main printed circuit board (7) mounting a read/write circuit for the magnetic discs (4); the magnetic discs (4), the magnetic heads (5) and the head actuator (6) being housed within the case (1, 2); and the motor, the printed circuit board for driving the motor and the main printed circuit board (7) being arranged outside of the base (1) of the case (1, 2), characterised in that: the head actuator comprises a head arm (6e) which is rotatable about a pivot (6f), the pivot (6f) comprising an outer sleeve (10) mounted on a stationary shaft (12), wherein a lower inner peripheral edge of the outer sleeve is inclined, and the shaft (12) is supported on a seat (12a) which has an inclined periphery corresponding to the inclined peripheral edge of the outer sleeve (10).

Claim 14

A magnetic disc device according to Claim 8, 9 or 10, wherein the device comprises a magnetic head structure (5) comprising a magnetic head electrically connected to a read/write means through a lead wire (5a) and a head arm (6e) supporting the magnetic head (5), wherein the head arm (6e) has a groove-like lead wire holding means (10) formed along the lead wire path, the lead wire being fitted and held therein.

Claim 15

A magnetic head structure comprising a magnetic head (5) electrically connected to a read/write means through a lead wire (5a) and a head arm (6e) supporting the magnetic head (5), characterised in that the head arm (6e) had a groove-like lead wire holding means (10) formed along the lead wire path, the lead wire being fitted and held therein.

Claim 16

A magnetic head structure comprising a magnetic head (5) electrically connected to a read/write means through a lead wire (5a) and a head arm (6e) supporting the magnetic head (5), characterised in that the head arm (6e) had a groove-like lead wire holding means (10) formed along the lead wire path, the lead wire being fitted and held therein.