JPH0124757Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is an improvement of a head operation mechanism for moving the magnetic head of a magnetic disk device for recording or reproducing signals on concentric recording tracks of a magnetic disk in the diametrical direction of the magnetic disk. Regarding.

BACKGROUND TECHNOLOGY AND PROBLEMS The head operation mechanism of a magnetic disk device records and reproduces still image signals, for example, and for a magnetic disk device used in the same way as a camera, a device as shown in FIG. 1 has been proposed. ing. Reference numeral 4 denotes a so-called mechanical chassis serving as a substrate of the device, and 3 a lid, which also serves as a holder for a magnetic disk device (described later). 6 is a hinge of the lid body 3 relative to the mechanical chassis 4; 9 is a rotary table; 7 is a motor; a belt 1 is connected between the rotary shaft and the rotary table 9;
2 is stretched. A rotating arm 2 is rotatably attached to a shaft pin 5 set on the chassis 4, and a spring 8 is suspended between a part of this arm and a cut-out piece, that is, a fixed part provided on the chassis 4. It is stretched.

At the tip of the rotating arm 2, an arc-shaped part is formed with the shaft pin 5 as the center, and a gear (not shown) is formed on the outer surface of the arc-shaped part.
A magnetic head 1 is attached to the rotating arm 2 near the rotating table 9 mentioned above.

Reference numeral 13 denotes a guide plate whose side edge is bent into a Z-shape and fixed to the mechanical chassis 4. A part of this guide plate 13 further protrudes to the side opposite to the rotating arm 2 and forms a guide plate 15. and its upper surface serves as a guide surface 14 for a magnetic disk (described later),
A through hole 14a is formed in this to form the above-mentioned head 1.
has been penetrated and is facing upward.

Therefore, by driving the head feeding mechanism 10 described above, the rotating arm 2 rotates about the shaft pin 5, and the head 1 moves within the through hole 14a. In reality, the head feeding mechanism 10 operates intermittently, and therefore the head 1 also moves intermittently. Note that the configuration of this mechanism section 10 is not directly related to the gist of the present invention, so a detailed explanation thereof will be omitted.

11 indicates a magnetic disk device as a whole;
1a is a yoke, 24 is a magnetic disk (sheet) attached to this, 26 is its jacket (case), 27 and 28 are window holes formed in this, and these are on both sides of the jacket 26.
They are formed in opposite positions. and window hole 2
A yoke 7 faces a portion of the magnetic disk 24, and a portion of the magnetic disk 24 faces 28, respectively.

When this magnetic disk device 11 is placed inside the holder 3 and the so-called lid is closed, the yoke 11a is attracted to the rotary table 9 in a positioned manner (generally, the rotary table 9 has a magnet, and the yoke 11a is formed of a magnetic material), the window hole 2 of the jacket 26
The guide stand 1 of the above-mentioned guide plate 13 is placed in one of the holes of 8.
5 is inserted, and the magnetic head 1 comes into contact with the magnetic disk 24. A back guide stand 25 is attached to the inner surface of the lid body 3, and when the lid is in the closed state described above, it is inserted into the other hole of the window hole 28 of the jacket 26 to guide the magnetic disk 24 to the head. 1 so that the magnetic head 1 hits the magnetic disk 24 appropriately. Reference numeral 30 denotes a groove formed in this back guide table 25, which is substantially opposite to the movement locus of the head 1 described above.

According to such a configuration, the magnetic head 1 moves on a circular locus centered on the pin 5 (represented by the dotted line B in FIG. 2), and in this state, each of the plurality of magnetic tracks A signal is recorded on the magnetic disk 2, and the signal is recorded on the trajectory shown by the dashed line A in FIG.
If reproduction is performed using a magnetic head moving on a straight line passing through the center of 4, the angles of the recording head and reproducing head with respect to the magnetic track will change except for the points where both lines A and B coincide, resulting in so-called azimuth loss. It turns out. In general, in order to ensure compatibility between a plurality of recording devices, playback devices, or both devices of this type, it is preferable to construct the magnetic head so that it moves along the above-mentioned straight line A. .

Purpose of the invention This invention solves the above-mentioned drawbacks by keeping the azimuth angle of the magnetic head constant for all recording tracks, stabilizing the signal output, eliminating azimuth loss, and improving compatibility with other equipment. The purpose is to obtain the following.

Summary of the invention In this invention, a board equipped with a magnetic head is configured to move linearly while being guided by a guide rail, in other words, it is configured to function as a slider, and the slider is further rotated by a rotation arm. It is characterized by being configured to be operable.

Embodiment An embodiment of the present invention will be described below with reference to FIG. 3 and subsequent figures.

In FIG. 3, parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.
That is, in the present invention, as shown in part in FIG.
4a is formed along straight line A shown in FIG. That is, it is formed linearly.

On the other hand, a slider 16 is provided on the rotating arm 2, and the above-described magnetic head 1 is mounted on the slider 16 so as to face upward from the through hole 14a. The slider 16 is slidable relative to the rotating arm 2 in its longitudinal direction. Reference numeral 20 indicates a long hole formed on the lower surface of the slider 16, and reference numeral 21 indicates a pin installed on the rotating arm 2, which engage with each other, thereby regulating the sliding direction of the slider 16. There is. In this case, as shown in FIG. 4, a leaf spring 23 penetrated by a pin 21 is interposed between the rotating arm 2 and the slider 16. 22 is the through hole.

The slider 16 has a V cross section at one end.
On the other hand, a guide rail 18 is formed on the lower surface of the above-mentioned guide plate 13, and with the elasticity of a spring 23, the guide groove 17 is formed.
7 is engaged with the guide rail 18, the slider 16 is brought into pressure contact with the lower surface of the guide plate 13 with appropriate elasticity. In this example, the guide rail 18 is formed of a round bar, and a case is shown in which this is adhered to the guide plate 13. Further, the direction in which the guide rail 13 extends coincides with the direction along the through hole 14a of the guide surface 14. Also, the other end of the slider 16 has a protrusion 1.
9, which is configured to slidably engage with a guide groove 29 provided on the lower surface of the guide plate 13, and thus move along the guide groove 29.

According to such a configuration, the magnetic disk device 1
1 stored in the holder 3, that is, in the lid body, by closing the holder 3, as explained in FIG.
The yoke 11a can be attracted to the rotating table 9 and thereby rotated, and the magnetic head 1 can be brought into contact with the magnetic disk 24 through one of the window holes 28 of the jacket 26. Therefore, the magnetic head 1 can record signals on the magnetic disk 24 or reproduce them from the magnetic disk 24, as in the conventional case.

Then, the rotating arm 2 is rotated by the drive of the head feeding mechanism 10 (intermittent drive in this example), so that the head 1 attempts to rotate around the shaft pin 5, but in this case, the slider 16 It is attached so that it can slide on the rotating arm 2,
Moreover, since the guide groove 17 of the slider 16 is guided by the guide rail 18, the rotating arm 2
Although the magnetic disk 2 rotates,
4, so head 1 moves only in the radial direction of
It moves on the trajectory shown by the dashed line A in FIG. 2, that is, on a straight line passing through the center of the magnetic disk 24. This means that it becomes possible to obtain compatibility of the magnetic disk device with other recording devices, playback devices, or devices that serve as both. Note that the upper surface of the slider 16 is in contact with the lower surface of the guide plate 13, so that the head 1
, that is, the contact pressure with respect to the magnetic disk 24 is determined. In addition, a back guide stand 25 is provided on the lid 3 side at a position facing the magnetic head 1, and this holds down the magnetic disk 24 from the side opposite to the magnetic head 1 during recording or reproduction. , the magnetic head 1 is inserted into the groove 30 of the back guide table 25.
(This is formed in a straight line) It also allows you to move along the line.

Furthermore, as described above, since the head 1 moves on a straight line, the recording angle of the magnetic head 1 with respect to the magnetic disk 24 is always constant, and there is no risk that the so-called azimuth angle will cause azimuth loss with respect to each magnetic track. .

Effects of the Invention As detailed above, according to the device of the present invention, the azimuth angle of the magnetic head for all the recording tracks of the magnetic disk can be made constant with a simple configuration, the signal output can be stabilized, and azimuth loss can be eliminated. ,
This has the effect of providing compatibility with other devices.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional magnetic disk device, Fig. 2 is an explanatory diagram showing the relationship between a magnetic disk and a magnetic head, and Fig. 3 shows a portion of the head operating mechanism, which is the main part of an embodiment of the present invention. 4 is an exploded perspective view of the main parts of the head operating mechanism, and FIG. 5 is a partial sectional view. 1 is a magnetic head, 10 is a head feeding mechanism, 1
1 is a magnetic disk device, 15 is a guide stand, 16 is a slider, 17 is a guide groove, and 18 is a guide rail.

Claims (1)

[Claims for Utility Model Registration] In an operating mechanism for moving a magnetic head onto a predetermined recording track of a magnetic disk mounted in a magnetic disk device, a rotating arm rotated by the drive of a head feeding mechanism; a slider provided on the rotating arm and having an engaging part that restricts linear movement in the radial direction of the magnetic disk; a guide that engages with the engaging part of the slider; and a magnetic head, wherein the slider is linearly moved on the predetermined track by the rotating arm and its head feeding mechanism while keeping the azimuth angle constant. magnetic disk recording or reproducing device.