JPH0668663A - Disk driving device for recording - Google Patents

Abstract

PURPOSE:To increase the recording capacity of a recording disk and the capacity of a recessed part for housing parts as far as possible while the size and thickness over the entire part of the device are reduced as far as possible. CONSTITUTION:The annular recessed part 14 opening to a disk chamber 12 side is provided on a base plate 10. A hard disk 42 is held on an overhanging part 26 of a rotor hub 22. A magnetic head 46 can be put into and out between the rear surface of the hard disk 42 and the front surface of an annular plate 28 for holding. The outside wall part of the annular recessed part 14 on the left side of the middle of the center and right end of the annular recessed part 14 and the outer part in the diametral direction thereof are formed in a first projecting part 48 having a slight spacing with the rear surface of the hard disk 42. The rear side of the first projecting parts 48 is formed the recessed part for housing parts 50 opened low direction. A second projecting part 58 in which the magnetic head 46 can be put in and out is formed between the outside wall part, exclusive of the first projecting part 48, of the annular recessed part 14 and the rear surface of the hard disk 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording disk drive device in which a spindle motor section is provided on the inside of a disk in a base.

[0002]

2. Description of the Related Art By further miniaturizing and thinning equipment such as a personal computer including a so-called notebook personal computer, a recording disk drive unit incorporated therein is further miniaturized. -Thinning is required.

The above demand can be met to some extent by providing the spindle motor, which is separately manufactured and mounted on the base of the disk chamber of the recording disk drive, integrally with the base of the disk chamber.

However, when the demand for miniaturization and thinning becomes more severe, there is a limit to the reduction of the outer diameter of the spindle motor part in order to secure the necessary output.
Therefore, while increasing the proportion of the spindle motor portion in the size of the device, a sufficient recording capacity is secured for the recording disk driven by the spindle motor portion, and necessary electronic parts and the like are accommodated. Space must also be provided.

The present invention has been made in view of the above problems existing in the prior art, and its object is to make the entire apparatus as small and thin as possible.
An object of the present invention is to provide a recording disk drive device capable of increasing the recording capacity of a recording disk and the capacity of a recess for storing components.

[0006]

In order to achieve the above object, the recording disk drive device of the present invention is a recording disk drive device in which a spindle motor portion is provided on the inside of the disk chamber of the base. The spindle motor unit is fixed to the base so that the spindle motor is concentric with the annular recess of the disk inner opening provided in the base and is rotatably supported by the base, and the rotor frame is located substantially in the annular recess. A magnetic field means fixed to the rotor frame so as to face the armature in the radial direction, and a magnetic field for recording between the base side surface of the recording disk and the spindle motor section. The inner peripheral portion of the recording disc is held by the rotor frame in the disc holding portion so that the reading head has a space through which the reading head can move in and out. The outer circumference of the annular recess is located between the radial position taken by the outer circumference of the part and the radial position taken by the outer circumference of the recording disk held by the rotor frame, and the outer wall part of the annular recess in the base and its radial outward direction. Of the parts about 200 at the center angle around the rotation axis of the rotor frame
And a portion of the outer wall of the annular concave portion of the base is formed on the first convex portion where the recording and / or reading head cannot move in and out of the gap between the recording disk and the side surface of the base. A second convex portion in which the head can move in and out of a side surface of the recording disk base, and a back side of the first convex portion of the base formed in a component accommodating recess opening to the outside of the disk chamber. I am trying.

Further, in the recording disk drive device of the present invention, the flexible circuit board, which is pulled out from the bottom of the annular recess through the outer peripheral surface of the annular recess to the outside in the radial direction of the annular recess, is located on the inside of the disk in the base. It is preferable that the floating prevention member fitted to the outer peripheral surface extends from the inside of the annular recess to the outside and prevents the lifting from the base.

[0008]

According to the first aspect of the invention, there is a gap between the side surface of the base of the recording disk and the spindle motor portion so that the head can move in and out, and a part of the outer wall portion of the annular recess in the base is the recording disk. Since the head is formed in the second convex portion that can move in and out of the base side surface of the disk, the range in which the head can be positioned on both sides of the recording disk is radially inward from the outer peripheral position of the annular concave portion. From the outer peripheral position of the disc holding portion to the outer peripheral position of the recording disc outside the outer peripheral position of the annular recess, the width is wider than the difference between the outer diameter of the recording disc and the outer diameter of the spindle motor portion.

Further, a portion of the outer wall portion of the annular recessed portion and the radially outer portion of the base which is about 200 degrees or more at the central angle about the rotation axis of the rotor frame is a gap from the side surface of the base of the recording disk. Since the head is formed in the first convex portion that cannot move in and out, and the back side of the first convex portion in the base is formed in the component accommodating concave portion that opens to the outside of the disk chamber, the component accommodating concave portion is Both the area and the height can be made as large as possible.

According to the second aspect of the present invention, the floating prevention member is fitted to the base, whereby the flexible circuit board is prevented from being lifted from the base from the inside to the outside.

[0011]

Embodiments of the present invention will be described with reference to the drawings. 1 to 6 relate to a hard disk drive device as one embodiment of the present invention. FIG. 1 is a plan view of a disk chamber with a lid removed, and FIG.
II-O-II line sectional view in FIG. 3, FIG. 3 is a bottom view, and FIG.
3 is a sectional view taken along line IV-IV in FIG. 3, and FIG.
FIG. 6 is a right side view of an essential part, taken along the line —OV. In addition,
Needless to say, the recording disk drive device of the present invention is
It is not limited to those that target hard disks.

Reference numeral 10 is a base of a hard disk drive,
Reference numeral 11 is a lid of the disc chamber 12. The base 10 has a horizontally long rectangular shape in FIG. 1, and an annular recess 1 that is open toward the disk chamber 12 with the center left thereof as the center.
4 is provided on the base 10. A cylindrical portion 16 protruding upward from the inner peripheral portion of the bottom of the annular recess 14 concentrically with the annular recess 14 constitutes an inner peripheral wall of the annular recess 14. The inner peripheral portion of the cylindrical portion 16 is a through portion.
The base 10 is forged and then cut on the disk chamber 12 side.

Reference numeral 18 is a first ball bearing, and 20 is a second ball bearing. The outer rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the inner peripheral wall of the cylindrical portion 16 with an adhesive. The inner race and the outer race of the first ball bearing 18 and the second ball bearing 20 are coated with an amorphous film (not shown) of DLC (diamond-like carbon film synthesis technology). As a result, the strength and impact resistance of each ball bearing are increased to prolong the service life. The DLC amorphous film may be coated on the rolling sphere.

Reference numeral 22 is a rotor hub. Rotor hub 22
A rotary shaft 24 is provided at the center of the
Inner rings of the first ball bearing 18 and the second ball bearing 20 are fixed to the outer peripheral surface of the adhesive 4 by an adhesive. Thereby, the rotor hub 22 is concentric with the annular recess 14 and the base 10
It is rotatably supported with respect to. At the lower end of the outer peripheral wall of the rotor hub 22, an overhanging portion 26 for supporting the lower surface of the inner circumferential portion of the hard disk is provided. Below the overhanging portion 26, an annular holding plate 28 for holding a rotor magnet is provided. The inner circumference of is fixed. The holding annular plate 28 and the rotor hub 22 form a rotor frame. An outer peripheral portion of the holding annular plate 28 has a hanging portion 28a holding an annular rotor magnet 30 inside, and the hanging portion 28a and the annular recess 14 face each other with a slight radial gap. . The holding annular plate 28 is made of a soft magnetic material,
It also serves as the yoke of the rotor magnet 30 and the magnetic shield plate.

Reference numeral 34 is a stator core fixed to the outer peripheral surface of the cylindrical portion 16, 36 is a stator coil wound around the stator core 34, and the rotor magnet 30 and the stator core 34 are opposed to each other with a radial gap. is doing.

The hanging portion 28a of the holding annular plate 28, the rotor magnet 30 (field means), the stator core 34 and the stator coil 36 (armature) are substantially annular recesses 14.
It is housed inside. The cylindrical portion 16, the rotor hub 22, the holding annular plate 28, the stator core 34, the rotor magnet 30, the hanging portion 28a, and the annular recess 14 provide a labyrinth seal effect, and the first ball bearing 18 is provided.
And the fine particles of the lubricant of the second ball bearing 20 and the like are stored in the disk chamber 12.
It can be prevented from scattering inside. In addition, the holding annular plate 28
The annular groove portion 38, which is formed between the rotor magnet 30 and the rotor magnet 30, has a radially inward opening, stores the lubricant fine particles and the like from the first ball bearing 18 and the second ball bearing 20, and the disk chamber 1
It has the effect of preventing scattering within 2.

Reference numeral 40 denotes a sealing member which seals the lower end of the inner peripheral portion of the cylindrical portion 16 which is a through portion. The annular recess 14, the cylindrical portion 16, the first ball bearing 18, the second ball bearing 20,
Rotor hub 22, stator core 34, stator coil 3
6, a holding annular plate 28, a rotor magnet 30, and the like, a spindle motor unit A for driving a hard disk
Is configured. Since the annular recess 14, which is the stator frame of the spindle motor unit A, is integrally provided on the substrate 10, the overall height of the device can be kept low.

The rotor hub 22 has a hard disk 42.
Is externally fitted, and the lower surface of the inner peripheral portion 42 a of the hard disk 42 is supported on the upper surface of the protruding portion 26. Reference numeral 44 denotes a clamp member for holding the inner peripheral portion of the hard disk 42 between itself and the overhanging portion 26 under pressure, and its outer diameter is substantially equal to the outer diameter of the overhanging portion 26. The clamp member 44 is screwed to the upper end of the rotor hub 22.

The overhanging portion 26 and the clamp member 44 form a disk holding portion. The outer diameter of the annular recess 14 is more than twice the outer diameter of the overhanging portion 26 and the clamp member 44, and the outer diameter of the hard disk 42 is less than three times the outer diameter of the rotor hub 22 and the clamp member 44. The outer periphery of the hard disk 42 is located slightly inside the outer edge of the base 10.

The hard disk 4 is located between the lower surface (base side surface) of the hard disk 42 and the upper surface of the holding annular plate 28.
Among the magnetic heads 46 arranged on the upper and lower surfaces of the second magnetic head 46, there is a gap through which the lower one can come in and out.

In FIG. 1, all of the outer wall portion of the annular recess 14 and substantially the radially outer portion of the annular recess 14 in the portion on the left side of the center of the annular recess 14 in the longitudinal direction of the base plate 10 and the right end thereof are located. All are formed in the 1st convex part 48 of a fixed height which has a slight gap with which the magnetic head 46 cannot move in and out with the lower surface of the hard disk 42. First
The convex portion 48 has a center angle around the rotation axis of the rotor hub 22 and a center angle of about 2 around the left side portion in FIG.
Occupies 20 degrees. As shown in FIGS. 3 and 4, the back side of the first protrusion 48 of the board 10 is formed as a component storage recess 50 that opens to the outside of the disk chamber 12.
52 is a circuit board fixed to the back side of the substrate 10, 54
Are mounted on the circuit board 52, and the component storing recess 50
It is an electronic component for a control circuit housed inside.

All of the outer wall of the annular recess 14 of the base 10 except the first protrusion 48, and most of the radially outer portion of the outer recess except the head positioning mechanism recess 56 are located on the lower surface of the hard disk 42. The magnetic head 46 is formed in the second convex portion 58 having a height that allows the magnetic head 46 to move in and out. The head positioning mechanism recess 56 is located at the front right portion in FIG. 1, and its height is, as shown in FIG.
Between the bottom surface of No. 4 and the top surface of the second convex portion 58.

Between the lower surface of the hard disk 42 and the upper surface of the holding annular plate 28, there is a gap through which the magnetic head 46 can move in and out, and the first convex portion 48 of the outer wall portion of the annular concave portion 14 of the substrate 10 is provided. All except hard disk 4
The magnetic head 46 can move in and out of the gap between the lower surface of the second
Since the protrusions 58 are formed, the range in which the magnetic heads 46 can be positioned on both sides of the hard disk 42 extends from the outer peripheral position of the overhanging portion 26 to the outer peripheral position of the hard disk 42 through the outer peripheral position of the annular recess 14. It is wider than the difference between the outer diameter of 42 and the outer diameter of the spindle motor portion A, that is, the outer diameter of the holding annular plate 28.

Further, the first convex portion 48 having a height having a slight gap with the lower surface of the hard disk 42 is the outer wall portion of the annular concave portion 14 of the base 10 and the rotor hub 22 of the radially outer portion thereof. It occupies about 220 degrees at the central angle around the axis of rotation, and its backside is the recess 50 for storing parts.
Since the concave portion 50 for storing the components is formed as described above, both the bottom area and the height can be made as large as possible. Therefore, it is possible to increase the recording capacity of the hard disk 42 and the capacity of the component storing recess 50 while reducing the size and thickness of the entire apparatus as much as possible.

Reference numeral 60 denotes a pivot assembly fixed to the recess 56 for the head positioning mechanism.
An arm 62 for holding a voice coil 6 and a voice coil (not shown) at the tip and the base, respectively, is rotatably supported on the base 10. Reference numeral 64 is a yoke of a voice coil motor for rotating the arm 62 to position the magnetic head 46, and 66 is a guide pin provided on the base 10 for positioning the yoke 64. A ball bearing (not shown) used for the pivot assembly 60.
As the lubricant, it is preferable to use oil rather than grease. This is for suppressing the variation in effective torque due to the voice coil motor and improving the positioning accuracy of the magnetic head 46.

A flexible circuit board 68 is adhered to the lower surface of the stator coil 36 wound around the stator core 34, and the flexible circuit board 68 has a lead-out portion 68a.
Is drawn out from the bottom of the annular recess 14 to the outside in the radial direction of the annular recess 14 via the outer peripheral surface portion of the annular recess 14 and the second protrusion 58. The leading end portion of the pull-out portion 68a is fixed on the front end portion 70a of the connector 70 fixed to the right rear portion of the board 10 in FIG. 1, and the circuit is connected to the connector pin 72 by soldering. Front end portion 70 of the connector 70
The height a is formed to be slightly lower than the other portions of the connector 70 in order to secure the height of the solder by soldering the lead-out portion 68a while suppressing the overall height.

Reference numeral 74 is a fitting hole penetrating the base 10. A through hole is provided at a position corresponding to the fitting hole 74 in the drawer portion 68a. Reference numeral 78 is a lifting prevention member. FIG. 7 is an enlarged plan view of the lifting prevention member 78, and FIG. 8 is a central longitudinal sectional view thereof. The floating prevention member 78 is formed by bending a plate-shaped member in response to a change in height from the bottom and outer peripheral surface of the annular recess 14 to the second protrusion 58, and corresponds to the fitting hole 74. A downward fitting protrusion 80 is provided at the position.

The fitting protrusion 80 penetrates the through hole of the pull-out portion 68a and fits into the fitting hole 74 to prevent the floating prevention member 7 from rising.
Since 8 is fixed to the base 10, a portion of the pull-out portion 68a of the flexible circuit board 68, which extends from the bottom and outer peripheral surface of the annular recess 14 to at least the outer peripheral position of the hard disk 42, is prevented from floating from the base 10. There is. As a result, the conductive path of the pull-out portion 68a is broken, the rotor hub 22 rotates, and the magnetic head 4 is rotated.
Interfering with the movement of 6 is easily and reliably prevented. 8
Reference numeral 2 is a seal member for sealing the fitting hole 74.

The vertical positional relationship in the above description of the embodiments is merely for convenience of description based on the drawings, and does not limit the actual use state or the like.

[0030]

According to the recording disk drive device of the present invention,
The range in which the head can be positioned on both sides of the recording disk is wider than the difference between the outer diameter of the recording disk and the outer diameter of the spindle motor portion, and is also a part formed on the back side of the first convex portion of the base. Since the bottom area and height of the storage recess can be made as large as possible, it is possible to increase the recording capacity of the recording disk and the capacity of the component storage recess while making the entire device as compact and thin as possible. Becomes

According to a second aspect of the present invention, there is provided a recording disk drive device in which a floating prevention member is fitted to a board to lift the flexible circuit board from the inside of the annular recess to the outside, and the flexible circuit board thereby. It is possible to easily and reliably avoid the disconnection of the conduction path and the obstruction of the movement of the spindle motor unit and the head.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a lid of a disc chamber is removed.

FIG. 2 is a sectional view taken along line II-O-II in FIG.

FIG. 3 is a bottom view.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along line V-O-V in FIG.

FIG. 6 is a right side view of a main part.

FIG. 7 is an enlarged plan view of a lifting prevention member.

FIG. 8 is a vertical cross-sectional view of the central portion of FIG.

[Explanation of sign]

 10 Base 12 Disk Chamber 14 Annular Recess 22 Rotor Hub 28 Retaining Annular Plate 30 Rotor Magnet 34 Stator Core 36 Stator Coil 42 Hard Disk 46 Magnetic Head 48 First Convex Part 50 Recessed Part 58 58 Second Convex Part 68 Flexible Circuit Board 68a Draw-out Part 78 Lifting prevention member A Spindle motor part

Claims (2)

[Claims] 1. A recording disk drive apparatus comprising a spindle motor section provided on the inside of a disk in a base, wherein the spindle motor section is concentric with an annular recess of an opening inside the disk provided on the board. And a rotor frame rotatably supported on the base, an armature fixed to the base so as to be located substantially in the annular recess, and fixed to the rotor frame so as to face the armature in a radial direction. Of the recording disk so that there is a gap between the side surface of the base of the recording disk and the spindle motor section for allowing the recording and / or reading head to move in and out. The peripheral portion is held by the rotor frame in the disc holding portion, the radial position taken by the outer circumference of the disc holding portion, and the outer circumference of the recording disc held by the rotor frame. The outer periphery of the annular recess is located between the radial position and the radial position, and a portion of the outer wall of the annular recess in the base and a portion of the outer portion in the radial direction that is about 200 degrees or more at the central angle about the rotation axis of the rotor frame. Is formed on the first convex portion where the recording and / or reading head cannot enter or leave the gap between the recording disk and the side surface of the base,
A part of the outer wall portion of the annular concave portion of the base is formed as a second convex portion in which the head can move in and out of the gap with the side surface of the recording disc, and the back side of the first convex portion of the base is located outside the disc chamber. A recording disk drive device, characterized in that the recording disk drive device is formed in an opening for storing a component. 2. A floating prevention member fitted to a base on which a flexible circuit board is drawn from the bottom of the annular recess to the outside of the annular recess in the radial direction of the annular recess on the inside of the disk in the base. 2. The recording disk drive device according to claim 1, wherein the recording disk drive device extends from the inside of the annular recess to the outside and is prevented from rising from the base.