JPS62287475A - Disk device - Google Patents

Abstract

PURPOSE:To reduce the number of places adjusted for positioning and to widely utilize a disk recording area by fixing one of a yoke or a magnet to one and another of a movable body or a housing by a buffer. CONSTITUTION:A buffer 32 is fixed to a housing 1, and a magnet 33 is fixed to the buffer 32. On the other hand, a yoke 34 made of a soft magnetic body such as iron, etc. and a magnet is fixed to a movable body 3 and moves to the direction of the arrow mark 40. When movement of the movable body became uncontrollable, the yoke 34 comes into contact with the magnet 33, and the movable extent of the movable body 3 is restricted, and energy at the time of collision is received by the buffer 32, and the buffer acceleration of the movable body is lessened. At the time of transportation, etc., the yoke 34 is in contact with the magnet 33 beforehand, and the movable body 3 is held by magnetic attraction generated by the yoke 34 and magnet 34, and the movable body 3 does not move even when a shock is applied during transportation etc.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a mechanism for limiting the movable range of a movable body of a disk device and for holding the movable body.

[Conventional technology]

FIG. 2 is a plan view showing an example of a conventional disk device. A head 7 for recording and reproducing is fixed to a movable body 3 and rotates and reciprocates in the direction of an arcuate arrow 20 in the figure about a shaft 10, while a disk 2 is fixed to a disk drive motor 6 and rotates. The movable body drive motor is composed of a magnetic circuit section 8 and a coil section 9, and the coil section 9 is fixed to the movable body 3 and is driven in the direction of the arcuate arrow 21 in the figure to access the head 7. The two side surfaces of the coil portion 9 fixed to the movable body 3 come into contact with separate buffer bodies 1.2 and 15, respectively, so that the range of movement of the head 7 relative to the disk 2 is limited. Especially in magnetic disk drives, the head cannot move within a certain range on the disk, and if the head exists outside this range, the head will move.

This may cause damage to the disk or destroy recorded signals, resulting in a fatal defect in the disk device. Therefore, as mentioned above, it is necessary to limit the movable range of the head. Also, during transportation, the movable body moves with 8 mouths @Ijg and the head,
It is necessary to hold the movable body so as not to damage the disk 7. The plunger 36 of the electromagnet 55 fixed to the body 1 moves in the direction of the arrow 37 when energized or de-energized, and when not energized, it engages with the protrusion 38 of the movable body 3 to hold and fix the movable body 3.

FIG. 3 is an explanatory diagram showing the breakdown of the recording area in the radial direction of the disk. The horizontal axis shows the disk radial distance. The head can move on the disk from a distance E1 to a distance F1, and the movable range between these distances is defined as A1. Distance within this range
A stopper for restricting the movement of the movable body is placed between G1 and distance H1, and a mechanism for holding the movable body is set in distance machining 1. Clearances B1 and 01. A clearance D1 is required due to positional variations in the holding mechanism. Therefore, the recording/reproducing area E1 is narrowed to 1:A1-B1-C1-DI.

FIG. 4 is an explanatory diagram showing the contents of the movable range in a conventional disk device. Buffers 12 each fixed to the magnetic circuit unit 802 identified by the integrated unit 1 or the magnetic circuit unit 802,
The movable body 3 moves between 13. The A variation in the spacing between the casings 10 is -ΔA, and the B variation in the thickness of the buffer body 12 is ΔB.
C variation in thickness of buffer body 13 is ΔC1 buffer body 12.1
Let H and G be the thickness of the fixing means 22 and 25 between the movable body 3 and the housing 1, and let E be the variation in the dimensions of the movable body 3 and ΔE. In addition, if the position of the movable body holding mechanism is set to 1, the clearance with the buffer body is taken, and the variation is ΔD, the movable range of the movable body 3 is IF==A-((E-11+D+Fi+G+H)+(Δ
A+ΔB+ΔC+ΔD+ΔE)). The shock absorbers 12 and 15 are often made of a material such as rubber. It is very difficult to achieve dimensional accuracy with rubber, and ΔB and ΔC become extremely large.

Furthermore, the fixing means 22,25 often uses adhesive.

Controlling the dimensions of adhesives is extremely difficult. These dispersion factors are a major factor in reducing the movable range E, and in order to absorb the dispersion, very strict adjustments have been made on each contact surface. Similarly, extremely high precision was required for the IR adjustment of the holding mechanism.

Since the movable body holding mechanism normally uses an electromagnet, it is energized when the device is in use, consuming a large amount of power, and requires a very complicated mechanism and many parts. Because there were many moving parts, mechanical reliability was poor, and there were many problems such as rash.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional technology has the following problems.

In recent years, the capacity of disk devices has rapidly increased, track density has increased, and the disks used have become high-performance and expensive.

Therefore, 1) The number and width of variation of the above-mentioned variation factors are large, and in particular, the disk usable area is narrowed due to the two buffer bodies, their fixing means, and the position of the movable holding mechanism, which becomes a major obstacle to increasing the capacity of the disk device. was.

2) In order to secure the same capacity, it is necessary to increase the track density to compensate for the smaller disk usage area, and even in normal cases, disk devices are forced to design near the limit with a small safety factor as the density increases. , which significantly reduced data reliability.

5) Furthermore, in order to compensate for 1) and 2), high-performance and expensive disks and heads had to be used, leading to a significant increase in costs.

4) In order to reduce variations, it was necessary to use a high-precision shock absorber and movable body holding mechanism, and to make very strict positioning adjustments for them.

5) A complicated movable body holding mechanism using electromagnets was required.

6) The use of electromagnets consumes a large amount of power, and the resulting heat generation causes off-track deviations between the head and the data track on the disk, reducing the data reliability of the disk device.

7) The movable body holding mechanism using electromagnets has many moving parts, has low mechanical reliability, and has many problems such as rash.

The present invention is intended to solve these problems, and aims to eliminate the need for electromagnets, reduce the number of component parts, reduce variation factors, reduce the need for positioning adjustments, and widely utilize the disk recording area. Another objective is to provide a highly reliable and inexpensive disk device with low power consumption, low heat generation, and low dust emission.

[Means for solving problems]

In the disk device of the present invention, in a mechanism that limits the movable range of the movable body and holds the movable body during non-operation, either a yoke or a magnet is fixed to either the movable body or the housing, and the movable body or The other side of the yoke or the magnet is fixed to the other side of the housing, and at least one buffer body is fixed to the yoke or the magnet.

[Effect]

According to the above-mentioned structure of this button light, 1. Since the movable body is held without consuming electric power by the attractive force generated between the magnet and the yoke, there are few components and there is no moving part, so no electricity is generated.

Z Since the magnet and buffer body are integrated, the movable range limiting device and the movable body holding device are integrated.

Therefore, the number of components is small, and the factors of variation are small.

〔Example〕

Examples of the present invention will be described in detail.

FIG. 5 is an explanatory diagram showing the principle of the disk device of the present invention. A buffer body 32 is fixed to the housing 1, and this buffer body 32
A magnet 33 is fixed to. On the other hand, a yoke 34 made of a soft magnetic material such as iron or a magnet is fixed to the movable body 3 and moves in the direction of arrow 40 in the figure. If the movement of the movable body cannot be controlled, the yoke 54 comes into contact with the magnet 33, and the range of movement of the movable body 3 is limited. Also, the energy at the time of collision is received by the buffer body 32, which alleviates the collision acceleration of the movable body. Furthermore, during transportation, etc., the yoke 34 is in a state of being in contact with the magnet 33 in advance, and the movable body 6 is held by the magnetic attraction generated by the yoke 34 and the magnet 33. It never moves. In addition, the force of the motor that drives the movable body 3 is sufficiently large for the holding force required during transportation, etc., so when the movable body 3 is driven by a motor, the driving force is not affected by the holding force and the movable body Break out of the hold state. Further, since the attractive force generated between the yoke 54 and the magnet 33 is inversely proportional to the square of the distance between the two, the attractive force has almost no effect on the normal movement range of the movable body. .

It is also possible to construct the magnet 33 with a rubber magnet, a plastic magnet, etc., and problems such as dust generation can thereby be solved. Furthermore, the same effect can be obtained even if the positions of the yoke 34 and the magnet 35 are exchanged.

FIG. 6 is an explanatory diagram showing the principle of another example of the disk device of the present invention. A magnet 33 is fixed to the integral part 1, and a buffer body 32 is further fixed to this magnet 33. On the other hand, a yoke 34 made of a soft magnetic material such as iron or a magnet is fixed to the movable body 3. The movable range of the movable body 3 is the yoke 34 and the buffer body 3.
It is limited by the contact surface with 2. The energy at the time of a collision is absorbed by the buffer body 32, which softens the impact acceleration of the movable body.

In addition, a yoke 34 and a magnet 330 are used to hold the movable body during transportation.
Achieved with just one effort. There is a buffer body 32 between them, resulting in a magnetic circuit configuration including a gap portion, but the required holding force is sufficiently large enough to be achieved by this magnetic circuit.

Furthermore, since the contact surface is a buffer, there are no problems such as dust generation or magnet cracking. Furthermore, the same effect can be obtained even if the positions of the yoke 34 and the magnet 33 are exchanged.

FIG. 7 is an explanatory diagram of the disk device of the present invention. - The buffer bodies 4 sandwich a support body 5, and the support body 5 is fixed to the housing 1 with screws 11. A magnet 33 is fixed to one of the two surfaces of the buffer body 4. One side of this magnet 33 and the buffer body 4
One side becomes the contact surface. A yoke 34 is fixed to the movable body 3, which moves around a shaft 10 fixed to the housing 1, and forms a contact surface. Further, a part of the movable body 3 becomes a protrusion and forms a contact surface. A buffer body 4 and a magnet 33 are arranged within this range, and the movable axis H of the movable body 3 is limited by NU, and the movable body 3 is held by the attractive force of the magnet 33 and the yoke 34.

FIG. 1 is an explanatory diagram of an example of a disk device of the present invention.

Magnetic circuit section 8. The movable body 3 driven by a coil portion 9 fixed to the movable body 3 has two contact portions. One part is a protrusion of the movable body 3, and the other part is a yoke 34 fixed to the movable body 3. A magnet 35 is fixed to one side of one buffer body 40 placed in a position sandwiching this, and is also fixed to the body 1 by a support body 5. Note that the other components and their functions are the same as those described above.

FIG. 8 is an explanatory diagram showing the structure of the buffer body, magnet, and support body of the present invention. One buffer body ★ is fitted into both sides of the support body 50 having a hole and is integrated. Further, the protrusion of the magnet 33 is fitted into the groove of the buffer body 4 to form an integrated structure. It goes without saying that these may also be fixed using methods such as inserts, adhesives, and fastening.

FIG. 9 is an explanatory diagram showing the contents of the movable range of the disk device of the present invention. The movable body 3 has two contact surfaces, one of which is formed by a yoke 34. Adjust the distance between these contact surfaces, and adjust the variation by -Δ.

The thickness of the buffer body 4 sandwiching the support body 5 fixed to the housing 1 is X, the variation is Δ, and the magnet 3 is fixed to the buffer body 4.
If the thickness of the movable body 3 is J and the variation is ΔJ, then the movable range of the movable body 3 is L = Any (,T-)-K) + (Δwork + ΔJ
+ΔK)) compared to the conventional example described above, the factors of variation are significantly reduced and the movable range is expanded. Also, since there is only one buffer with large variations, the overall variation is reduced. Further, since the magnet 33 and the buffer body are integrated, the only adjustment is to adjust the movable range, and there is no need to adjust the movable body holding position, and there is no need to consider variations in position adjustment.

FIG. 10 is an explanatory diagram showing another example of the disk device of the present invention. The housing 1 has a protrusion 24 and a yoke 2.
5 are fixed to the casing 1, and each constitute a contact surface. A support body 5 fixed to the movable body 3 with a screw 16 and a buffer body 4 sandwiching the support body 15 are arranged within this interval, and a magnet 33 is fixed to the buffer body 4. The other components and their operations are the same as described above.

The support body 5 can easily be constructed from the flexible body 1, such as an elastic body such as a leaf spring. In this case, the energy of the impact can also be absorbed by the support 5, and the displacement of the contact portion due to the impact can be significantly reduced, which is very effective in expanding the recording area. As described above, according to the present invention, 1) It is possible to limit the range of motion of the movable body and to hold the movable body with a simple mechanism with few components, and there is no need to adjust the position of the movable body holding, which is the main cause of variation, and the shock absorber Since the discs can be integrated into one and no adhesive is required, the number and width of variations are small, and the recording area of the disc can be widely used, thereby increasing the capacity of the disc device.

2) Since the recording area can be expanded, a disk device with high data reliability can be realized by lowering the track density.

3) Because of 2), inexpensive heads and disks can be used without compromising data reliability, contributing to cost reduction.

4) Since there is little variation, it is possible to use an inexpensive slow-acting body with loose accuracy and a movable body holding mechanism, and adjustments only need to be made to the movable range position, or no adjustment is possible, contributing to a cost reduction.

5) It is possible to hold a movable body with a very simple mechanism consisting only of a magnet and a yoke, and there is no need to adjust its positioning.

6) Since no electromagnets are used, there is no power consumption, no heat generation, and no overload, which improves the data reliability of the disk device.

7) Since the present invention does not require moving parts such as conventional electromagnets and plungers, it has high mechanical reliability and has fewer problems such as ignition.

8) By configuring the impactor with a plate spring or the like, the displacement due to impact can be reduced, and the recording area can be widely used effectively, so that the effects of 2) and 3) are promoted.

It has this effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of a disk device according to the present invention. FIG. 2 is a plan view showing an example of a conventional disk device. FIG. 3 is an explanatory diagram showing the breakdown of the recording area in the radial direction of the disk. FIG. 4 is an explanatory diagram showing the contents of the movable range in a conventional disk device. FIG. 5 is an explanatory diagram showing the principle of the disk device of the present invention. FIG. 6 is an explanatory diagram showing the principle of another example of the disk device of the present invention. FIG. 7 is an explanatory diagram of the disk device of the present invention. FIG. 8 is an explanatory diagram showing the structure of the buffer body, magnet, and support body of the present invention. FIG. 9 is an explanatory diagram showing the contents of the movable range of the disk device of the present invention. FIG. 10 is an explanatory diagram showing another example of the present invention. 1... Housing 2... Disk 3... Movable body 4.12, 13.32... Buffer 5... ......Support 6...Disc drive motor 7...
...Head 8...Magnetic circuit section 9...Coil section 1o...Shaft 11.16...Screw 22.23...Fixing means 24...Protrusion 33 of the casing...Magnet 34...Yoke 35...Electromagnet 36. ...Plunger 38...Protrusion of movable body 1-End 34: Yoke, ' Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Atsushi 7 Figure 8 Figure 9

Claims (1)

[Claims] (1) In a mechanism that limits the movable range of a movable body and holds the movable body during non-operation, either a yoke or a magnet is fixed to either the movable body or the housing, and the movable body or A disk device characterized in that the other one of the yoke or the magnet is fixed to the other side of the casing, and at least one buffer body is fixed to the yoke or the magnet.