JPS60239977A - Recording and reproducing device of magnetic disc - Google Patents

Abstract

PURPOSE:To prevent the wear of a magnetic disc by moving vertically a supporting member and turning a carriage around a guide member to displace a magnetic head to the position, where it is abutted on the magnetic disc, and the position where it is distant from the magnetic disc. CONSTITUTION:A recording and reproducing device of the magnetic disc is so constituted that roll supporting plates (supporting members) 10 and 10A are moved vertically to displace a magnetic head 18 to the position, where it is abutted on a magnetic disc, and the position where it is distant from the magnetic disc 40. That is, power is not supplied to a solenoid coil of a vertical moving device 11A until the magnetic disc 40 reaches a prescribed rotation number, and during this period, a carriage 7 is turned because the roll supporting plate 10A is turned around a supporting shaft 13A by the elasticity of a compression spring 16A until it is brought into contact with a control screw 14A, and the magnetic head 18 is separated from the magnetic surface of the magnetic disc 40 in accordance with this turning. Thus, the wear of the magnetic disc and the magnetic head is reduced.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a magnetic disk recording/reproducing device.

(Prior Art) In recent years, recording and reproducing devices using magnetic disks have been widely used. This recording/reproducing device has the advantage of being able to record and reproduce information in a few milliseconds, and has excellent so-called random accessibility.

This advantage is realized by moving a magnetic head for recording and/or reproducing data onto and/or from 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 way,
Conventionally, there have been the following problems.

(1) 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 will be unstable. , there was 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.
No. 762). This magnetic recording/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, keeping the magnetic head separated from the magnetic disk. When the rotational speed of the magnetic disk reaches a specified value, the electromagnetic attraction is released and the magnetic head is brought into contact with the surface of the magnetic disk. However, in this 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, which causes wear on the magnetic surface of the magnetic disk and wear on the magnetic head. There is a problem that the number of cases increases significantly.

(Objective) An object of the present invention is to provide a 5K magnetic disk recording and reproducing apparatus in which a magnetic head contacts the magnetic disk only when performing recording or reproducing operations on the magnetic disk.

(Summary) A magnetic disk recording/reproducing device according to the present invention supports a carriage to which a magnetic head is fixed in a slidable manner so that the magnetic head moves in the radial direction of the magnetic disk. The magnetic head is supported so that it can move toward and away from the magnetic surface of the magnetic disk, and the magnetic head is separated from the magnetic disk until the magnetic disk reaches a predetermined rotation and while the magnetic head is moved in the radial direction of the magnetic disk. It is characterized by what it did.

(Example) The present invention will be described below based on an example shown in FIGS. 1 and 3.

Bearing parts 2 and 3 protruding from the board surface of the board 1 are integrally formed at both ends of one side edge in the longitudinal direction of the board 1, which has a rectangular planar shape. A guide shaft 4, which is a guide member, is spanned between 2 and 3, and the coaxial shaft 4 is fixed to the substrate 1 by having both ends of the guide shaft 4 being held down by a holding plate 5.6. A carriage 7 that is slidable in the axial direction of the guide shaft 4 is disposed on the guide shaft 4 . The carriage 7 has an inverted shape in plan view, and the guide shaft 4 is inserted through the vertical portion of the carriage 7 . The carriage 7 can be rotated vertically at a predetermined angle around the guide shaft 4, that is, rotated clockwise and counterclockwise. are arranged one above the other. A roller support plate 10 is inserted between both rollers 8 and 9. This roller support plate 10 has a shape 5 such that both side line portions thereof can be rotated in the vertical direction by a magnetic head vertical movement device 11. As shown in FIG. 3, this magnetic head vertical movement device 11 has a channel-shaped frame 12 with an opening 4 on the side facing the horizontal end surface of the carriage 7. A support shaft 13, which is suspended horizontally within the frame body, is fixed to both front and rear side walls of the frame body 12. The roller support plate 10 is rotatably attached to the support shaft 13 so as to pass through the middle thereof. One side edge of the 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 body is sandwiched between the rollers 8 and 9. The tips of adjustment screws 14 and 15 for position regulation, which are screwed into the frame 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, a tension spring 16 is provided between the upper surface of the roller support plate 10 and the inner surface of the earthen wall of the frame.
A solenoid 17 is attached to the lower wall of the frame 12 facing the tension spring 16. In the magnetic head vertical movement device 11 configured as described above, when the coil of the solenoid 17 is de-energized, the tension spring 1
The roller support plate 10 rotates clockwise around the support shaft 13 due to the tensile force of 6, and the upper surface of the other side edge
4, and when energized, the other side edge of the roller support plate 10 is attracted by the magnetic attraction force of the solenoid 17, so that the roller support plate 10 rotates counterclockwise around the spindle 13. direction, and the lower surface of the other side edge comes into contact with the upper end of the adjusting screw 16.

On the other hand, a magnetic head 18 for recording video signals and the like on a magnetic disk 40 and reproducing signals recorded on the disk 40 is fixedly supported on the outer surface of the horizontal portion of the carriage 7. 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 and a main scale of an optical linear encoder 50 are arranged integrally with the carriage 7, and an index scale 20 facing this main scale passes through the inside of the square hole 19. It is arranged as follows. This index scale 2
Both ends of 0 are fixed to mounting portions protruding from the plate surface of the board 1. A light emitting section 21 is embedded in a portion of the carriage 7 that faces the top surface of the index scale 20.

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 board surface of the substrate 1 surrounded by the inverted carriage 7 .

Further, a cam mechanism 23 is provided on the plate surface of the substrate 1 at a position facing the horizontal portion of the carriage 7 with the motor 22 sandwiched therebetween.
is installed. This cam mechanism 23 is connected to the carriage 7
Guide shaft 4. The cam mechanism is slid on the roller support plate 10 to move the magnetic head 18 in the radial direction of the magnetic disk 40, and a stepping motor 24, which is a motor for driving this cam mechanism, is attached to the back surface of the substrate 1. is,
An output shaft 25 of the motor 24 passes through the substrate 1 and extends above the top surface, and a first plate cam 26 and a second plate cam 27 are fixed to the output shaft 25. Also, carriage 7
The base of a protruding arm 28 extending parallel to the horizontal part of the carriage 7 is fixed to the tip of the vertical part of the carriage 7, and a first roller 29 is rotated on the upper surface of the tip of the protruding arm 28. Freely fixed and supported. The first roller 29 is in contact with the power input surface of the first plate cam 26. Further, the base end of a comparatively thick narrow strip-shaped leaf spring 30 is fixed to the distal end surface of the vertical portion of the carriage 7, and the second plate cam 27 is attached to the distal end of the leaf spring 30. A second roller 31 is supported that contacts the actuating cam surface. The roller 31 is installed by forming a notch 34 in the center of the tip of the leaf spring 30 along the longitudinal direction of the leaf spring 30, and separating the leaf spring 30 into upper and lower parts. Connect the tip to the second p-ra 31
is wound around the upper and lower ends of a rotatably supported shaft 32, so that the coaxial shaft 32 is fixed to the tip of the leaf spring 30.

The operating cam edge of the first plate cam 26 is formed so that its diameter gradually increases around the output shaft 25.
The difference between the minimum diameter and the maximum diameter of No. 6, that is, the operating stroke, is set approximately equal to the movement range of the magnetic head 18 in the radial direction 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 drawing plate cam 27
6.27 The positional relationship of each operating cam surface is the contact point between the cam surface of the first plate cam 26 and the curved surface of the first roller 29, and the cam surface of the second plate cam 27. The straight line distance between the contact point with the second roller 61 is approximately equal over the rotation range of the drawing board cams 26 and 27, which is approximately one revolution.

The optical linear encoder 50 is formed of the above-mentioned main scale, light receiving section, index scale 201 and light emitting section 21, and based on the degree of overlapping of the slits formed in each of the main scale and index scale 20, This is to obtain position detection information of the carriage 7 for controlling the operation of the stepping motor 24 in a closed loop.

In this manner, the magnetic disk recording/reproducing apparatus of this embodiment is configured. The operation will be explained below. When a magnetic disk is attached to the output shaft of the output shaft 22 via a chucking member (not shown) and the start button is pressed, the magnetic head vertical movement device 1 is operated until the magnetic disk reaches a predetermined rotation.
The coil of the first solenoid 17 is not energized. 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 accordingly rotates counterclockwise around the guide shaft 4. The magnetic head 18 is displaced to a position away from the magnetic surface of the magnetic disk 40.

Then, 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 be pulled toward the solenoid 17 by the tension spring 16.
It rotates about the support shaft 13 as a fulcrum against the elasticity of the same four-
The lower surface of the other side edge of the support plate 10 abuts the upper end of the adjustment screw 15. Then, the roller 8 is fixed by the roller mounting plate 10.
is pushed upward, and the carriage 7 rotates 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 performed stably in this contact state.

Also, at this time, information is obtained by detecting the position of the carriage 7, in particular the position of the magnetic head 18, by the optical linear encoder 50.

Next, when moving the magnetic head 18 closer to the motor 22, the output shaft 25 of the stepping motor 24
When clockwise rotation is applied to the first plate cam 26 , the first plate cam 26 rotates clockwise around the output shaft 25 , and the cam surfaces of the first roller 29 and the first plate cam 26 rotate accordingly. The contact point with the output shaft 25 approaches the side of the output shaft 25. Therefore, the carriage 7 slides on 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 at the time when the desired position is detected by the optical encoder Z'50. 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.

In addition, in this way, the magnetic head 18 is connected to the magnetic disk 40.
Since the coil of the solenoid 17 is not energized while the roller is being fed in the radial direction, the roller support plate 10 rotates clockwise around the support shaft 13 due to the tensile force of the tension spring 16. The upper surface of the other side edge of the roller support plate 10 comes into contact with the tip of the adjustment screw 14. Therefore, since the i-ra support plate 10 pushes the roller 39 downward, the carriage 7 also rotates counterclockwise around the guide shaft 40, and the magnetic head 18 is separated from the magnetic disk 40.

On the other hand, when moving the AK head 1B 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 move toward the adjustment screw 14. The magnetic head 18 rotates clockwise around the spindle 13 until it comes into contact with the tip of the magnetic head 12, and the carriage 7 also rotates counterclockwise, and the magnetic head 18 separates from the magnetic surface of the magnetic disk 40. are doing.

In the above embodiment, two plate cams 26°27
The cam mechanism 23 is configured to move the carriage 7 in the radial direction of the magnetic disk, but this is achieved by arranging a DC motor 60 parallel to the guide shaft 4 as shown in FIG. A feed screw mechanism may be used in which a feed screw 62 is fixed to the output shaft 61 of a motor 60, and a feed rod 66 that presses against the feed screw 62 is fixed to the side surface of the carriage 7.

In this case, by rotating the output shaft 61 of the DC motor 60, the feed rod 6, which is in pressure contact with the feed screw 62, is rotated.
3 moves in the axial direction of the guide shaft 4, the carriage 7 slides in the axial direction of the guide shaft 4, and the magnetic head 18 can be moved in a desired radial direction of the magnetic disk 40. . It goes without saying that during such a feeding operation of the magnetic head 18, the magnetic surface of the magnetic disk 40 and the magnetic head 18 are separated by the operation of the magnetic head vertical movement device 11, as described above.

Further, a magnetic head vertical movement device 1 as shown in FIG.
1, a magnetic head vertical movement device 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 edge extending horizontally touches the upper peripheral 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 line portion is in pressure contact with a sliding piece 8A attached to the tip of the horizontal portion of the carriage 7 via a leaf spring 8B, and the roller 9 and the sliding piece 8A The horizontally extending edge of the roller support plate 10A is inserted.

Further, the inner surface of the right-angled bent portion of the roller support plate 10A is supported by the rotation support shaft 13A, and the roller support plate 1
0A is designed to be able to swing around the support shaft 13A. A compression spring 16A is disposed between the inner surface of the tip of the other side edge extending downwardly of the roller support plate 10A and one stationary member. However, this rotation is regulated by the adjustment screw 14A. This adjustment screw 1
4A is screwed into one stationary member 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 this adjustment screw 14A, and regulates the rotational position of the roller support plate 10A in the counterclockwise direction. A solenoid 17A is disposed above the solenoid 17A.

During this period, and while the magnetic head 18 is being sent in the radial direction of the magnetic disk 40, there is no current. Therefore, during this period, the roller support plate 1 is
Since 0A rotates clockwise around the support shaft 15A until it comes into contact with the adjustment screw 14A, the carriage 7 rotates counterclockwise around the guide shaft 4, and along with this, The magnetic head 18 is now 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 magnetic head 1
8, when the coil of the solenoid 17A is energized, the solenoid 17A generates a magnetic attraction force, which causes the roller support plate 10A to press against the compression spring 16.
The roller support plate 10A rotates counterclockwise around the support shaft 13A, and the carriage 7 rotates clockwise around the guide shaft 4. The head 18 is brought into contact with the magnetic disk 40, and desired recording and/or reproducing operations are performed.

(Effects) According to the present invention, since the magnetic head is brought into contact with the magnetic disk only when performing recording or reproducing operations on the magnetic disk, wear of the magnetic disk and wear of the magnetic head are reduced. The number of dropouts of the recording/reproducing apparatus can be greatly reduced accordingly.

16-

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic disk recording and reproducing apparatus showing an embodiment of the present invention, FIG. 2 is a schematic enlarged plan view of the magnetic disk recording and reproducing apparatus shown in FIG. 1, and FIG. , FIG. 4 is a perspective view of a magnetic disk recording and reproducing apparatus showing another embodiment of the present invention, and FIG. The figure is a sectional view of a main part showing another example of a magnetic head vertical movement device. 4...Guide shaft (guide member) 7...
......--+Yarifuji 10.1OA...Roller support plate (support member) 11
, 11A...Magnetic head vertical movement device 18...
...Magnetic head patent applicant Olympus Optical Industry Co., Ltd. Agent
Shichibe Fujikawa

Claims (1)

[Scope of Claims] A magnetic head that performs recording and/or reproducing operations by contacting a magnetic disk; A carriage that fixedly supports the magnetic head and moves the head in the radial direction of the magnetic disk; The carriage is supported so as to be rotatably displaced in the vertical direction in order to move the head toward and away from the magnetic surface of the magnetic disk, and the carriage is supported in order to move the magnetic head in the radial direction of the magnetic disk. a guide member that slidably supports the carriage; a support member that slidably holds the magnetic head on the opposite side of the carriage from the side supported by the guide member; and a support member that slidably holds the magnetic head; , a magnetic head vertical movement device that rotates the carriage around the guide member and displaces the magnetic head between a position in contact with the magnetic disk and a position away from the magnetic disk. recording and reproducing equipment.