JP3124580B2 - Hard disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hard disk drive for driving a hard disk in a disk chamber.

[0002]

2. Description of the Related Art In recent years, demands for thinner, smaller, and lighter notebook personal computers have been increasing. In order to respond to such demands, further reduction in thickness, size, and weight of hard disk devices incorporated in notebook-type personal computers and the like have been demanded.

However, in the conventional hard disk drive, a circuit board for driving and controlling a hard disk drive spindle motor, a magnetic head, and the like, and a ferromagnetic material shield plate for magnetic shielding are provided outside the disk room. Such a point constitutes one of the limitations regarding the reduction in thickness, size, and weight.

The present invention has been made in view of the above-described problems in the prior art, and has as its object to integrate a circuit board, a magnetic shield plate, and the like with a disk chamber to reduce the thickness. An object of the present invention is to provide a hard disk drive capable of realizing miniaturization, miniaturization, weight reduction, and the like.

[0005]

In order to achieve the above object, a hard disk drive according to the present invention is characterized in that either one of the base of the disk chamber or the lid of the disk chamber is made of a ceramic plate having at least a ceramic substrate layer. It is supposed to be.

Further, in the hard disk drive of the present invention, one of the base of the disk chamber and the lid of the disk chamber is made of a ceramic plate having at least a ferromagnetic ceramic layer.

[0007]

[Function] In the ceramics substrate layer of the ceramics plate,
A circuit made of metal foil can be directly printed, and a bare chip such as an IC can be directly mounted. The ferromagnetic ceramic layer in the ceramic plate performs a magnetic shielding function.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. The drawings relate to one embodiment of the present invention. FIG. 1 is a cross-sectional view of a main part of a hard disk drive, and FIG. 2 is a perspective view of a state where a main part of a lid is cut out.

Reference numeral 10 denotes a base of the disk chamber 12. The base 10 is made of aluminum.
Is erected. The disk chamber 12 is sealed by a lid 16 made of a ceramic laminate (ceramics plate).

Reference numeral 18 denotes a column-shaped support provided upright inside the disk chamber 12 of the base 10. The base 20 of the strut 18,
That is, the stator core 22 is externally fitted and fixed to the large diameter portion,
A stator coil 24 is wound around the stator core 22. And from the middle part to the end of the column 18,
The first ball bearing 26 and the second ball bearing 28 are externally fitted and fixed.

Reference numeral 30 denotes a first ball bearing 26 and a second ball bearing 2
8 is a rotor hub rotatably supported by 8. A rotor magnet 34 is fixed inside the large-diameter peripheral wall 32 of the rotor hub 30 and faces the stator core 22 with a radial gap therebetween. A hard disk 38 is externally fitted to the small-diameter peripheral wall 36 of the rotor hub 30, and is fixed and held by a clamp member 40.

The above-mentioned column 18, stator core 22, stator coil 24, column 18, first ball bearing 26, second ball bearing 28, rotor hub 30, and rotor magnet 34 constitute a spindle motor 42 for driving a hard disk. .

The large-diameter peripheral wall 32 of the rotor hub 30 and the end (the lower annular portion in FIG. 1) of the rotor magnet 34 are inserted into the annular groove 44 provided on the base 10 with a slight gap therebetween. ing. With such a configuration, a labyrinth sealing effect is obtained, and dust and oil particles in the spindle motor 42 are prevented from scattering into the disk chamber 12.

The lid 16 is composed of three ceramic layers. Facing into the disk chamber 12 is a first ceramic substrate layer 46. On the first ceramics substrate layer 46, a circuit 48 made of a metal foil is directly printed, and a capacitor 50 is formed.
And a circuit element such as a resistor 52 are provided. Also IC
Since the bare chip 54 is directly mounted, the space is largely saved. The intermediate layer is a ferromagnetic ceramic layer 56 made of ferrite that performs a magnetic shielding function. In this way, since the ceramic laminate also serves the functions of the lid, the circuit board, and the magnetic shield plate, it greatly contributes to making the device thinner, smaller, and lighter.

A second ceramics substrate layer 58 is provided facing the outside of the disk chamber 12. A circuit 60 made of a metal foil is printed on the second ceramics substrate layer 58, and various circuit elements are provided. And circuit 6
Reference numeral 0 denotes a three-dimensional circuit for electrically driving and controlling the spindle motor 42 by being electrically connected to the circuit 48 of the first ceramics substrate layer 46 by a conductive path 62 penetrating the first ceramics substrate layer 46 and the ferromagnetic ceramics layer 56. Circuit is constructed.

Reference numeral 64 denotes a circular filter formed on a part of the ceramic laminated plate constituting the lid 16. The filter section 64 is made of porous ceramics. The entry and exit of air through the filter unit 64 prevents dust and the like from entering the disk chamber 12, and alleviates the pressure fluctuation in the disk chamber 12 due to the rotation of the hard disk 38, thereby reducing the spindle motor 42.
This prevents dust and oil fine particles from being sucked out from the inside and scattering into the disk chamber 12.

Reference numeral 66 denotes a flexible lead board for electrically connecting a circuit inside the spindle motor 42 and the circuits 48 and 60 of the lid 16. The flexible lead substrate 66 is drawn out of the spindle motor 42, passes through a guide groove 68 provided inside the disk chamber 12 of the base 10, passes through the peripheral wall 14, and passes through the terminal 70 of the lid 16.
It is connected to the.

In this hard disk drive, the lid 16 of the disk chamber 12 is formed of a ceramic laminate, and the first ceramic substrate layer 46 and the second ceramic substrate layer 46 of the ceramic laminate are provided.
Circuits 48 and 66 are formed on a ceramic substrate layer 58, and various circuit elements and a bare chip 54 such as an IC are mounted thereon, and a three-dimensional circuit for controlling and driving the spindle motor 42 is formed.

The ferromagnetic ceramic layer 56 performs a magnetic shielding function, and further includes a filter section 64. Therefore, the number of parts is reduced, the number of assembling steps is reduced, and the hard disk drive is greatly reduced in thickness, size, and weight.

Although the example of the hard disk drive in which the lid 16 of the disk chamber 12 is made of a ceramic laminate has been described above, it is needless to say that the base of the disk chamber can be made of a ceramic laminate.

[0021]

According to the first aspect of the present invention, a circuit is directly printed on a ceramic substrate layer of a ceramic plate constituting one of a base of a disk chamber and a lid of the disk chamber, and a bare chip such as an IC. Can be directly mounted, so that the ceramic plate can also function as a base or lid and a circuit board. Therefore, it greatly contributes to the reduction in thickness, size, and weight of the device.

In the hard disk drive according to the present invention, the ferromagnetic ceramic layer of the ceramic plate constituting either the base of the disk chamber or the lid of the disk chamber performs a magnetic shielding action. It becomes possible for the ceramics plate to also function as the shield plate. Therefore, it greatly contributes to the reduction in thickness, size, and weight of the device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a hard disk drive.

FIG. 2 is a perspective view of a state where a main part of a lid is cut out.

[Description of sign]

 Reference Signs List 10 base 12 disk room 16 lid 46 first ceramic substrate layer 56 ferromagnetic ceramic layer 58 second ceramic substrate layer

Claims (2)

(57) [Claims] 1. A hard disk drive wherein one of a base of a disk chamber and a lid of the disk chamber is formed of a ceramic plate having at least a ceramic substrate layer. 2. A hard disk drive, wherein one of a base of the disk chamber and a lid of the disk chamber is formed of a ceramic plate having at least a ferromagnetic ceramic layer.