JPH0450639Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a magnetic disk device that prevents heat from a heating element including a spindle hub drive unit, a circuit board, etc. from having an adverse effect on a magnetic disk. Regarding.

(Prior art) A disk cartridge containing a magnetic disk as a recording medium for information signals is used, and by loading this into a predetermined recording/reproducing position, information signals are recorded and reproduced while rotating the magnetic disk. There is a magnetic disk device that uses

In conventional magnetic disk devices, the space into which the disk cartridge is inserted is almost sealed by an upper cover, etc., and a spindle hub for rotating the magnetic disk inside the cartridge and a spindle hub for driving the spindle hub are used. A spindle motor as a driving member is mounted on the floor of the frame and located within the space. As a magnetic disk device with such a configuration, Japanese Patent Application Laid-Open No. 59-52481
The one described in the publication No. 1 is known.

(Problems to be Solved by the Invention) According to the above-mentioned conventional magnetic disk device, the spindle motor and other heating elements are arranged in one sealed space in which the disk cartridge is loaded. Heat was trapped in the space, raising the temperature, causing the magnetic disk to expand and causing off-track, reducing the reliability of recording and reproduction.

In order to avoid the temperature rise in the above space, it is effective to provide holes for heat radiation in the upper cover.
There is a problem in that the provision of holes impairs the dustproof effect and magnetic shielding effect.

The present invention was made to solve these conventional problems, and it prevents the temperature rise in the disk cartridge loading space and prevents the heat emitted from the heating element from increasing, without impairing the dust-proofing effect or magnetic shielding effect. It is an object of the present invention to provide a magnetic disk device in which heat does not have an adverse effect on a magnetic disk.

(Means for solving the problem) In this invention, a space is created by a frame that serves as a mounting board for each component, a front bezel with a disk insertion slot, and a shield case, and a magnetic head is installed in the space. head carriage and
A cartridge holder that holds a disk cartridge and moves between a recording/playback position and an insertion/ejection position is provided in the space, a spindle hub that tracks the magnetic disk in the disk cartridge, and a head carriage that moves the magnetic disk within the disk radius. The present invention is characterized in that a moving means for moving in the direction faces the space, and a heating element including a driving section of the spindle hub, a driving section of the moving means, and a circuit board is provided outside the space.

(Function) The disk cartridge inserted from the disk insertion slot is loaded into the recording/reproducing position by the cartridge holder within the space formed by the frame, front bezel, and shield case. The magnetic disk in the cartridge is rotationally driven by a spindle hub, the magnetic head slides against the rotationally driven magnetic disk, and the magnetic head is moved in the radial direction of the disk by the head carriage, so that the magnetic disk can be moved to a predetermined position. Information signals are recorded and reproduced on the tracks. Heat generating elements such as a spindle hub drive unit, a head carriage drive unit, and a circuit board are provided outside the space, and the heat generated in these heat generating bodies is radiated to the outside.

(Example) In FIGS. 1 to 3, a front bezel 2 having a disk insertion slot 21 is fixed to the front end side of a frame 1 that serves as a mounting board for each component, and a shield case 3 is mounted on top of the frame 1. Fixed. The frame 1 has both side walls and a rear wall,
One space 20 is formed by the frame 1, the front bezel 2, and the shield case 3.
The shield case 3 has a convex portion 3b at a position near the rear end that serves as a relief for the magnetic head, which will be described later.
A concave portion 3a is formed on the front side from this convex portion 3b. A circuit board 6 is stacked and fixed on top of the shield case 3. The circuit board 6 has an escape hole 6a for the convex portion 3b of the shield case 3.
Various circuit elements 28 are fixed to the lower surface side of the circuit board 6, and these circuit elements 28 are located in the recess 3a of the shield case 3. The circuit board 6 can be seen as a heating element because the circuit elements 28 generate heat, but the circuit board 6 as a heating element is fixed on the shield case 3 and is therefore provided outside the space 20. There is.

A motor control circuit board 1 is mounted on the underside of the frame 1.
A spindle motor 4 integrally having a spindle motor 4 is attached. The spindle motor 4 has a spindle hub 5 on the upper side, and the spindle hub 5 is rotationally driven by the motor 4. The motor 4 serves as a drive section for the spindle hub 5. spindle hub 5
passes through the hole 30 of the frame 1 and faces the space 20. The spindle hub 5 chucks the hub of the magnetic disk in the disk cartridge to rotate the magnetic disk. The motor 4 is a heating element, but since the motor 4 is located below the frame 1 and outside the space 20, the generated heat is not led into the space 20.

The front on frame 1 (left side in Figure 3)
A slider 9 is placed which is energized. A cartridge holder 8 is further arranged above the slider 9. The cartridge holder 8 is provided to be movable only in the vertical direction while holding the disk cartridge in the space 20. When the slider 9 slides backward, the cartridge holder 8 rises and inserts the disk cartridge. The cartridge holder 8, which is moved forward by the biasing force of the slider 9, descends to the recording/reproducing position. An eject button 10 is fixed to the front end of the slider 9, and the eject button 10 projects forward from the front bezel 2. Since a well-known mechanism for moving the cartridge holder 8 can be used, a detailed explanation will be omitted. When the cartridge holder 8 is raised to the cartridge insertion/ejection position,
Cartridge insertion slot 21 of the front bezel 2
A disk cartridge can be inserted from the insertion slot 21, and the cartridge can be ejected from the insertion slot 21 by pressing the eject button 10.

Some standardized cartridges usually have a window hole that allows the magnetic head to slide into contact with the magnetic disk stored in the cartridge that is closed, and the window hole is opened when the cartridge is loaded into a magnetic disk device. Some have a shutter plate for this purpose. The shutter plate of such a cartridge may warp away from the cartridge body for various reasons, and if the cartridge is loaded into or ejected from a magnetic disk device with the shutter plate warped,
The warped shutter plate may get caught inside the magnetic disk device. However, according to the above embodiment, the upper surface of the loaded cartridge can be held down by the surface on the space 20 side of the recess 3a formed in the shield case 3, and the lower surface of the cartridge can be held by the holder 8. Since it can be held down, even if the shutter board is warped outward, this warp can be forcibly corrected, eliminating problems such as the shutter board getting caught on something. .

A stepping motor 7 is fixed to the outside of the rear wall of the frame 1. The stepping motor 7 rotates a feed screw 15 as a moving means for moving the head carriage in the disk radial direction, and the feed screw 15 passes through the rear wall of the frame 1 and faces into the space 20. Above space 2
A head carriage 12 is provided inside the head carriage 12 so as to be movable in the radial direction of the disk while being guided by a guide bar 13. The feed screw 15 is screwed into the head carriage 12 and bent, and the rotation of the feed screw 15 causes the head carriage 12 to move in the radial direction of the disk. Head carriage 12
has upper and lower magnetic heads 27 that can slide into contact with magnetic disks in a loaded disk cartridge. In some cases, the magnetic head may only be on one of the upper and lower sides. The stepping motor 7 is a driving means for the feed screw 15 and is a heating element. The stepping motor 7, which is this heating element, is provided outside the space 20 as described above.

In FIG. 3, numeral 11 is a head load damper, 23 is a mounting member for mounting the magnetic disk drive unit, and 25 is a cartridge ejection lever. These members are not directly related to the present invention, so detailed explanations will be omitted.

According to the above embodiment, a substantially sealed space 20 is formed by the frame 1, front bezel 2, and shield case 3, and the disk cartridge is loaded into this space 20, so that the dustproof effect and the shielding effect are improved. The effect is not impaired, and
The spindle motor 4 which is the drive part of the spindle hub 5 that chucks the disks in the disk cartridge, the stepping motor 7 which is the drive part which drives the head carriage 12, the heating elements such as the circuit board 6, etc. are outside the space 20. Since the magnetic disk is provided in the space 20, the temperature rise of the magnetic disk loaded in the space 20 is small, the expansion of the magnetic disk due to the temperature rise is small, off-track can be prevented, and the reliability of recording and reproduction can be improved.

The feeding method of the magnetic head is not limited to the feeding screw type, but may also be a steel belt type.

(Effects of the invention) According to the invention, a nearly sealed space is formed by the frame, front bezel, and shield case, and the disk cartridge is loaded into this space, which has a dustproof effect and shielding effect. In addition, the drive unit of the spindle hub that tracks the disks in the disk cartridge, the drive unit of the head carriage, and the heating elements such as the circuit board are installed outside the space, so they can be loaded into the space. The temperature rise of the magnetic disk is small, the expansion of the magnetic disk due to the temperature rise is small, off-track can be prevented, and the reliability of recording and reproduction can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a magnetic disk device according to the present invention, FIG. 2 is a perspective view showing the external appearance of the same embodiment, and FIG. 3 is an exploded perspective view of the above embodiment. 1...Frame, 2...Front bezel, 3...
...Shield case, 4...Spindle hub drive unit, 5...Spindle hub, 6...Circuit board, 7
... Drive unit of head carriage, 8 ... Cartridge holder, 12 ... Head carriage, 15
. . . means for moving the head carriage, 20 . . . space, 21 . . . disk insertion slot, 27 . . . magnetic head.

Claims (1)

[Scope of Claim for Utility Model Registration] A head carriage in which a magnetic head is attached, with a space created by a frame serving as a mounting board for each component, a front bezel with a disk insertion slot, and a shield case;
A cartridge holder that holds a disk cartridge and moves between a recording/playback position and an insertion/ejection position is provided in the space, a spindle hub that tracks the magnetic disk in the disk cartridge, and a head carriage that moves the magnetic disk within the disk radius. A magnetic disk characterized in that a moving means for moving in the direction faces the space, and a heating element including a drive section of the spindle hub, a drive section of the moving means, and a circuit board is provided outside the space. Device.