JPH04364278A - Magnetic disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the device in thickness by disposing individual constitutive elements along a 2nd direction of crossing the axial direction of a guide shaft and disposing an actuator in a position deviated outside from an idle end of an extension part of a carriage. CONSTITUTION:The carriage 7 has an inverse L shape in its plane-view shape, and the guide shaft 4 is inserted into a base part end in the lengthwise direction of the carriage, i.e., a vertical part extended in a 1st direction to be guided by the shaft 4. The above part is turned at a prescribed angle around the center of the shaft 4, in other words, it can be turned clockwise and counterclockwise. Then, the part extended approximately along the 2nd direction of crossing the shaft 4 of the carriage 7, i.e., the horizontal part is formed with the idle end on its extended end part, and the actuator (a vertical moving device for a magnetic head) 11 is disposed in relation to this idle end part. By this method, since the thickness of a disk driving part becomes approximately as it is the thickness of the device, the thickness of the device is not increased, where the actuator can be incorporated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk recording/reproducing apparatus, and more particularly to a magnetic disk recording/reproducing apparatus having an actuator that brings a recording/reproducing magnetic head into contact with a magnetic disk only when necessary. It is.

0002

2. Description of the Related Art In recent years, recording and reproducing devices using magnetic disks have been widely put into practical use. This recording/playback device is
It has the advantage of being excellent in so-called random access, meaning that information can be recorded and reproduced in a few milliseconds. This advantage is achieved by moving a magnetic head for recording and/or reproducing on concentric tracks formed or to be formed on a recording medium at high speed in the radial direction of the magnetic disk. By the way, when performing magnetic recording and reproduction in this manner, conventionally there have been the following problems.

That is, until the rotational speed of the magnetic disk reaches a certain value or more, that is, the relative speed between the magnetic disk and the magnetic head reaches a certain value or more, even if the magnetic head is brought into contact with the magnetic disk, the contact between the two is unstable. There is a risk of damage to the magnetic head or magnetic disk. For this reason, a magnetic recording/reproducing device has been proposed in which the magnetic head is separated from the magnetic disk when the rotation speed of the magnetic disk does not reach a certain value or higher when the rotation starts or stops.
-72762). This magnetic recording and reproducing device uses an electromagnet to attract a leaf spring that presses the magnetic head against the surface of the magnetic disk until the rotational speed of the magnetic disk reaches a certain value or higher, separating the magnetic head from the magnetic disk. Then, when the rotational speed of the magnetic disk reaches a specified value, the attraction by the electromagnet is released and the magnetic head is brought into contact with the surface of the magnetic disk.

0004

However, in this conventional device, when the magnetic head is sent in the radial direction of the magnetic disk, the magnetic head remains in sliding contact with the magnetic disk. There is a problem that the wear of the magnetic surface and the wear of the magnetic head are significantly increased. Therefore, in addition to separating the magnetic head from the magnetic disk when the rotation speed of the magnetic disk does not reach a certain value or more when starting or stopping rotation, we also separate the magnetic head from the magnetic disk when moving the magnetic head in the radial direction of the magnetic disk. It is conceivable that an actuator for separating the magnetic head from the magnetic surface, that is, a device for vertically moving the magnetic head, may be provided.

[0005] However, such an actuator has the drawback that it not only has a complicated structure but also a large volume, and as a result, a device incorporating it becomes large. In particular, this kind of equipment is designed to be thinner,
It is undesirable that the thickness of the device increases by incorporating an actuator (device for vertically moving the magnetic head). Therefore, there is an ingenuity in incorporating the above actuator.

An object of the present invention is to provide a magnetic disk recording and reproducing device that skillfully utilizes a magnetic disk drive mechanism and is provided with an actuator (a device for vertically moving a magnetic head) in conjunction with the drive mechanism of the magnetic disk. .

[0007]

[Means for Solving the Problems] A magnetic disk recording/reproducing device according to the present invention includes a guide member disposed so as to extend in a predetermined direction, and a base end portion of the magnetic disk recording/reproducing device arranged so as to extend in a predetermined direction. It is supported and movable in a first direction guided by the guide member, and has a portion extending from the base end generally along a second direction intersecting the guide member. a carriage having an extended end as a free end; a head mounted on the carriage at a location spaced apart from the base end by a predetermined distance generally along the second direction; and a base of the carriage. an actuator disposed further away from the end along the second direction than the extended end and generating a driving force for rotating the carriage around the guide member; It is characterized by being

[0008]

[Operation] The actuator (magnetic head vertical movement device) provided at the free end of the carriage that extends along the direction intersecting the guide member of the carriage is operated to rotate the carriage around the guide member. , a head attached to a position on the carriage separated by a predetermined distance along a direction intersecting the guide member of the carriage approaches and separates from the magnetic disk.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to illustrated embodiments. 1 to 3 show a first embodiment of the present invention. This magnetic disk recording/reproducing device has a substrate 1 having a rectangular planar shape at both ends of one longitudinal edge thereof.
Bearing parts 2 and 3 protruding from the plate surface of the board 1 are integrally formed, and a guide shaft 4, which is a guide member, is spanned between both bearing parts 2 and 3, and holds both ends of the guide shaft 4. The coaxial 4 is fixed to the substrate 1 by being pressed by the plates 5 and 6. This guide shaft 4 has a coaxial 4
A carriage 7 is disposed which is slidable in the axial direction of the guide shaft 4 and rotatable around the guide shaft 4 .

The carriage 7 has an inverted L-shape in plan view, and its proximal end in the longitudinal direction, that is, the vertical portion extending in the first direction guided by the guide shaft 4 is connected to the guide shaft 4. It is inserted through the guide shaft 4 so that it can rotate at a predetermined angle, that is, rotate clockwise and counterclockwise. And of the same carriage 7,
The portion extending generally along the second direction intersecting the guide shaft 4, that is, the horizontal portion, has a free end, and the carriage 7 is moved in relation to the free end. An actuator that rotates around the guide shaft 4 (
A magnetic head vertical movement device) 11 is provided.

The actuator 11 includes two rollers 8 and 9 that are arranged vertically at the tip of the extension end, and a roller support plate that is sandwiched between the two rollers 8 and 9 at one side edge. 10, a solenoid 17 for rotationally driving the roller support plate 10, and a tension spring 16. FIG. 3 shows the details of this actuator 11, in which a frame 12 having a channel-shaped cross section is open on one side facing the horizontal end surface of the carriage 7.
is fixed on the substrate 1, and a support shaft 13, which is suspended horizontally within the frame, is fixed to both front and rear walls of the frame 12. The roller support plate 10 is rotatably attached to the support shaft 13 through the middle thereof. One side edge of this roller support plate 10 extending toward the horizontal end surface of the carriage 7 is sandwiched between the rollers 8 and 9, and the other side edge extending toward the inside of the frame is sandwiched between the rollers 8 and 9. The tips of adjustment screws 14 and 15 for position regulation that are screwed into the body from above and below come into contact with each other, so that the range of rotation of the roller support plate 10 is regulated. Further, the tension spring 16 is provided between the upper surface of the roller support plate 10 and the inner surface of the upper wall of the frame, and the solenoid 17 is attached to the lower wall of the frame 12 facing the tension spring 16. ing.

Actuator 11 configured as described above
In this case, when the coil of the solenoid 17 is de-energized, the tension force of the tension spring 16 causes the roller support plate 10 to
rotates clockwise around the support shaft 13, and the upper surface of the other side edge is in contact with the lower end of the adjustment screw 14. When energized, the magnetic attraction force of the solenoid 17 causes the roller support plate 10 to By attracting the side edge, the roller support plate 10 rotates counterclockwise about the support shaft 13, and the lower surface of the other side edge comes into contact with the upper end of the adjustment screw 15.

On the other hand, in the middle of the outer surface of the horizontally extending portion of the carriage 7, that is, on the carriage 7, at a predetermined distance from the base end thereof generally along the second direction, there is a A magnetic head 18 for recording video signals and the like on the magnetic disk 40 and reproducing signals recorded on the disk 40 is fixedly supported. Further, a square hole 19 parallel to the guide shaft 4 is bored through the horizontal portion of the carriage 7 near the guide shaft. Inside this square hole 19, a light receiving part of an optical linear encoder 50 serving as a position detecting means and a main scale are mounted on the carriage 7.
An index scale 20, which is a position detection element facing the main scale, is disposed so as to pass through the rectangular hole 19. Both ends of the index scale 20 are fixed to mounting portions protruding from the plate surface of the substrate 1. And index scale 2
A light emitting section 2 is located at a portion of the carriage 7 facing the upper surface of the light emitting section 2.
1 is embedded.

On the other hand, a disk drive motor 22 for giving a predetermined rotation to the magnetic disk 40 is attached to a central portion of the plate surface of the substrate 1 surrounded by the inverted L-shaped carriage 7. ing. Further, a cam mechanism 23 is disposed on the surface of the substrate 1 at a position facing the horizontal portion of the carriage 7 with the motor 22 in between. This cam mechanism 23 is for sliding the carriage 7 along the guide shaft 4 and the roller support plate 10 and moving the magnetic head 18 in the radial direction of the magnetic disk 40.
A stepping motor 24, which is a motor for driving this cam mechanism 23, is attached to the back side of the cam mechanism 23, and an output shaft 25 of the motor 24 passes through the board 1 and extends above the top surface. First plate cam 26 and second plate cam 2
7 is polymerized and fixed. Further, the base of a protruding arm 28 extending parallel to the horizontal portion of the carriage 7 is fixed to the inner surface of the tip of the vertical portion of the carriage 7.
A first roller 29 is rotatably fixed to the upper surface of the tip of the protruding arm 28 .

[0015] This first roller 29
is in contact with the operating cam surface of the plate cam 26. Further, the base end of a comparatively thick thin strip-shaped leaf spring 30 is fixed to the distal end surface of the vertical portion of the carriage 7, and this leaf spring 3
A second roller 31 that comes into contact with the operating cam surface of the second plate cam 27 is supported at the tip of the second plate cam 27 . This roller 31 is attached to the tip of the leaf spring 30.
A cutout part 34 is formed in the center along the longitudinal direction of the leaf spring 30, and the tip part of the leaf spring 30 is divided into upper and lower parts.
The leaf spring 30 is wound around the upper and lower ends of a shaft 32 that rotatably supports the second roller 31.
It is fixed to the tip of the The operating cam edge of the first plate cam 26 is formed so that the diameter gradually increases around the output shaft 25, and the difference between the minimum diameter and the maximum diameter of the plate cam 26, that is, the operating stroke is the magnetic head 18. is set approximately equal to the radial movement range of the magnetic disk. Further, the second plate cam 27 also has a shape that is substantially symmetrical to the first plate cam 26, and the positional relationship between the respective operating cam surfaces of both plate cams 26 and 27 is similar to that of the first plate cam 26. The straight line distance between the contact point between the cam surface of the first roller 29 and the circumferential surface of the first roller 29 and the contact point between the cam surface of the second plate cam 27 and the second roller 31 is the distance between the two plate cams 26 , 27 are substantially uniform over a rotation range of about one rotation.

Note that the optical linear encoder 50
is formed by the above-mentioned main scale, light receiving section, index scale 20, and light emitting section 21, and controls the operation of the stepping motor 24 in a closed loop based on the degree of overlap of the slits formed in each of the main scale and index scale 20. The carriage 7 for controlling
This is to obtain position detection information.

The magnetic disk recording and reproducing apparatus of this embodiment is thus constructed. The operation will be described below. A magnetic disk is attached to the output shaft of the motor 22 via a chucking member (not shown), and a start button is pressed. Then, the coil of the solenoid 17 of the actuator 11 is not energized until the magnetic disk reaches a predetermined rotation. Therefore, the roller support plate 10 rotates clockwise around the support shaft 13 due to the elasticity of the tension spring 16, and the carriage 7 rotates counterclockwise around the guide shaft 4, thereby causing the magnetic head 18 is magnetic disk 4
It is displaced to a position away from the magnetic surface of 0.

When the magnetic disk 40 reaches a predetermined rotational speed and is in a state where stable recording or reproducing operation can be performed, the coil of the solenoid 17 is energized. When the coil of the solenoid 17 is energized, the attraction force of the solenoid 17 causes the roller support plate 10 to rotate around the support shaft 13 toward the solenoid 17 against the elasticity of the tension spring 16. The bottom surface of the other side edge of 10 is the adjustment screw 1
It touches the upper end of 5. Then, the roller 8 is pushed upward by the roller support plate 10, and the carriage 7 is rotated upward about the guide shaft 4, so that the magnetic head 18 comes into contact with the magnetic surface of the magnetic disk 40. Therefore, the desired recording or reproducing operation can be stably performed in this contact state. At this time, the optical linear encoder 50 determines the position of the carriage 7, in other words, the position of the magnetic head 1.
Information on the detected position of 8 is obtained.

Next, when moving the magnetic head 18 closer to the motor 22, the stepping motor 24
When clockwise rotation is applied to the output shaft 25 of the output shaft 25, the first plate cam 26 rotates clockwise around the output shaft 25, and along with this, the first roller 29 and the first plate cam 26 rotate. The point of contact with the cam surface approaches the side of the output shaft 25. Therefore,
The carriage 7 is guided by the guide shaft 4 and moves in the direction of arrow X, and the magnetic head 18 approaches the motor 22. Such movement of the carriage 7 is continued until the output information of the optical linear encoder 50 matches the information corresponding to the desired position, and the optical linear encoder 50
When the desired position is detected, the stepping motor 24 is brought into a non-driving state by a control circuit (not shown) to which information from the encoder 50 is input. In this way, the carriage 7 can be reliably moved to a desired position, or in other words, the magnetic head 18 can be accurately moved to a desired position on the magnetic disk.

Further, while the magnetic head 18 is being sent in the radial direction of the magnetic disk 40 in this manner, the coil of the solenoid 17 is not energized, so the tension force of the tension spring 16 causes the roller support plate to 10 is the spindle 13
The roller support plate 10 rotates clockwise around
The upper surface of the other edge comes into contact with the tip of the adjustment screw 14. Therefore, since the roller support plate 10 pushes the roller 9 downward, the carriage 7 also rotates counterclockwise around the guide shaft 4, and the magnetic head 18 is separated from the magnetic disk 40.

On the other hand, when moving the magnetic head 18 in a direction away from the motor 22, the stepping motor 24 is rotated counterclockwise, contrary to the previous rotation. Then, the carriage 7 can be moved in the direction of the arrow Y by performing the opposite operation to the previous one. While the carriage 7 is moving in the direction of the arrow Y in this manner, the coil of the solenoid 17 is not energized, so the tension force of the tension spring 16 causes the roller support plate 10 to close to the adjustment screw 14. The magnetic head 18 rotates clockwise around the support shaft 13 until it abuts the tip, and the carriage 7 also rotates counterclockwise accordingly, so that the magnetic head 18 is separated from the magnetic disk 40 .

In the above embodiment, the cam mechanism 23 is composed of two plate cams 26 and 27, which moves the carriage 7 in the radial direction of the magnetic disk.
As shown in FIG. 4, a DC motor 60 is arranged in parallel with the guide shaft 4, a feed screw 62 is fixed to the output shaft 61 of this motor 60, and a feed rod 63 is connected to the feed screw 62 in pressure contact. A feed screw mechanism fixed to the side surface of the carriage 7 may also be used.

In this case, the output shaft 6 of the DC motor 60
1, the feed rod 63 that is in pressure contact with the feed screw 62 moves in the axial direction of the guide shaft 4, and accordingly, the carriage 7 slides in the axial direction of the guide shaft 4, and the magnetic disk 40 The magnetic head 18 can be moved in a desired radial direction. Moreover, such a magnetic head 1
8, the magnetic surface of the magnetic disk 40 and the magnetic head 18 are moved by the operation of the actuator 11 in the same manner as described above.
Of course, they are separated from each other.

Furthermore, instead of the actuator 11 shown in FIG. 3, an actuator 11A configured as shown in FIG. 5 may be used. That is, the roller support plate 1
0A is formed of a plate bent at a substantially right angle, and the lower surface of the tip of one side edge that extends horizontally is in contact with the upper circumferential surface of the roller 9 attached to the tip of the horizontal portion of the carriage 7. The upper surface of the tip of the same side edge is the carriage 7
The roller supporting plate 10A is in pressure contact with a sliding piece 8A attached to the tip of the horizontal part via a leaf spring 8B, and the horizontally extending edge of the roller support plate 10A is sandwiched between the roller 9 and the sliding piece 8A. There is.

Furthermore, the inner surface of the right-angled bent portion of the roller support plate 10A is supported by a pivot shaft 13A, so that the roller support plate 10A can swing around the pivot shaft 13A. . A compression spring 16A is disposed between the fixed member 1A and the inner surface of the tip of the other side edge extending downwardly of the roller support plate 10A, and a compression spring 16A is provided to exert a clockwise rotational force on the roller support plate 10A. is giving. However, this rotation is regulated by the adjustment screw 14A. The adjustment screw 14A is screwed into the stationary member 1A so that its tip abuts the outer surface of the tip of the other side edge of the roller support plate 10A. Further, an adjustment screw 15A is screwed into the stationary member 1A at a position opposite to the adjustment screw 14A, and regulates the rotational position of the roller support plate 10A in the counterclockwise direction. Further, a solenoid 17A is disposed above the adjustment screw 15A.

Actuator 11 configured in this way
In A, the energization of the coil of solenoid 17A is as follows:
Electricity is not supplied until the rotation of the magnetic disk 40 reaches a predetermined number of rotations and while the magnetic head 18 is being sent in the radial direction of the magnetic disk 40. Therefore, during this period,
Due to the elasticity of the compression spring 16A, the roller support plate 10A rotates clockwise around the support shaft 13A until it comes into contact with the adjustment screw 14A.
rotates counterclockwise about the guide shaft 4, and as a result, the magnetic head 18 becomes separated from the magnetic surface of the magnetic disk 40.

On the other hand, when the coil of the solenoid 17A is energized, that is, when the magnetic disk 40 reaches a predetermined rotation speed and the feeding of the magnetic head 18 is completed, the solenoid 17A is magnetically attracted by the energization of the coil of the solenoid 17A. A force is generated, which attracts the roller support plate 10A against the elasticity of the compression spring 16A, and the roller support plate 10A rotates counterclockwise around the support shaft 13A.
As a result, the carriage 7 rotates clockwise about the guide shaft 4, the magnetic head 18 is brought into contact with the magnetic disk 40, and desired recording and/or reproducing operations are performed.

[0028]

As described above, according to the present invention, each component is arranged generally along the second direction that intersects the axial direction of the guide shaft, which is the guide member, and in particular, the extended end of the carriage. Since the actuator is disposed at a position outward from the free end, the overall thickness of the device can be reduced. The key point for this type of device is to make it thin.
In the present invention, since the thickness of the disk drive section is essentially the same as the thickness of the device, it is possible to provide a magnetic disk recording and reproducing device incorporating an actuator (a device for vertically moving the magnetic head) without increasing the thickness of the device. can do.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic disk recording/reproducing apparatus showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of main parts of the magnetic disk recording and reproducing apparatus shown in FIG. 1;

FIG. 3 is an enlarged sectional view showing a main part of an actuator in the magnetic disk recording/reproducing apparatus shown in FIG. 1;

FIG. 4 is a perspective view showing another example of the head feeding mechanism in the magnetic disk recording/reproducing apparatus.

FIG. 5 is an enlarged sectional view of a main part showing another example of the actuator in the magnetic disk recording/reproducing apparatus shown in FIG. 1;

[Explanation of symbols]

4……………………Guide shaft (guide member) 7…………
...... Carriage 10, 10A ...... Roller support plate 11, 11A ...... Actuator (magnetic head vertical movement device) 18 ...... Magnetic head

Claims (1)

[Claims] 1. A guide member disposed to extend in a predetermined direction, and a first direction in which the guide member is guided by the guide member while its base end is rotatably supported by the guide member. a carriage that is movably provided and has a portion extending from the base end generally along a second direction intersecting the guide member, the extended end being a free end; a head mounted on the carriage at a location spaced apart by a predetermined distance from the base end of the carriage generally along the second direction; and the extended end extending from the base end of the carriage along the second direction. 1. A magnetic disk recording/reproducing device comprising: an actuator disposed further away from the guide member, the actuator generating a driving force for rotating the carriage around the guide member.