JP2558657B2 - Magnetic disk device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic disk device represented by an electronic still camera.

2. Description of the Related Art In a magnetic disk device, "good contact" between a magnetic disk and a magnetic head is an important factor that influences the performance of the device. Conventionally, in order to realize this “good contact”, a method has been adopted in which a magnetic disk is pressed against the magnetic head by a pad arranged facing the magnetic head.
In this method, the relative positional relationship between the magnetic head and the pad with respect to the magnetic disk is "good contact".
Is a parameter for realizing. Generally, in a magnetic disk device, it is necessary to separate the pad from the magnetic head in order to mount and eject the magnetic disk in the device. Therefore, the pad moves relative to the magnetic head and the spindle with which the magnetic disk is engaged. In order to always obtain "good contact", even if the pad moves in this manner, it is necessary to accurately position the pad with respect to the magnetic head and the spindle in the operating state of the device.

The positional relationship of the pad with respect to the magnetic head or the spindle includes a positional relationship in a direction perpendicular to the recording surface of the magnetic disk, so to speak, a height direction, and a positional relationship in parallel to the recording surface, so to speak, a horizontal direction. In a magnetic disk device such as an electronic still camera, which is required to be miniaturized, the above-mentioned two positional relationships of the pads are always reproduced accurately. A compact mechanism is required.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In view of the above-described problems, the present invention keeps the pad high in the operating state even if the pad is separated from the magnetic head or the spindle when the magnetic disk is inserted into or ejected from the device. It is an object of the present invention to provide a compact magnetic disk device that is accurately positioned in both the vertical and horizontal directions.

SUMMARY OF THE INVENTION The present invention is directed to a first horizontal positioning means for mating at least one of two pad height determining pins on a pad or pad plate, and for mating the pad plate and spindle together. 2 is a magnetic disk device provided with a second horizontal positioning means.

Function In the present invention, the pad plate is positioned relative to the spindle by the second horizontal positioning means. Therefore, the pad fixed to the pad plate is positioned relative to the rotation center of the magnetic disk that is engaged with the spindle and rotates.

Example Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

1A and 1B are configuration diagrams of a magnetic disk device according to the present invention. The cassette 1 containing the magnetic disk 52 has a shutter 2 that closes a head insertion port (described later), and the shutter 2 can move in the direction of arrow 3. Therefore, by sliding the cassette 1 in the direction of the arrow 4 and inserting it into the compartment 5, the shutter opening / closing mechanism 6 opens the shutter 2. When the cassette 1 is ejected from the compartment 5, the shutter opening / closing mechanism 6 automatically closes the shutter 2. The compartment 5 is provided with a plurality of guide pieces 7a to 7f on the side where the cassette 1 is inserted so that the cassette 1 can be easily inserted.
The garage 8 is located outside the compartment 5 and together with the support shaft 10a on the base plate 9,
It is pivotally supported by 10b. The axial support direction is the insertion direction of the cassette 1, that is, the direction of arrow 4. Therefore, when inserting the cassette 1, the cassette 1 is slid with respect to the base plate 9. However, the sliding direction is parallel to the base plate 9, and there is no problem in interlocking with the slide plate A11. Slide plate B
12 is on the slide plate A11, both slide on the base plate 9 in the cassette insertion direction,
13 is moved and cassette 1 is ejected. The two plates are attracted to each other by a spring 14. The bent portion 11a of the slide plate A11 engages with the cassette 1, moves in the direction of arrow 15 when inserted, charges the slider 16, and actuates a two-step structure claw (described later) by suction of the solenoid 17. The head 13 is moved. When the garage 8 is opened (the state is as shown in the figure, but the figure is wider than it is for the sake of explanation), the opening spring 18 causes the hook plate 19 to open.
Of the slide plate A by engaging and moving the protrusion 19a.
Disengage the hook portion 11b of 11 and slide plate A11.
However, due to the force of a spring (described later) charged when the cassette 1 is inserted, it advances in the direction opposite to the arrow 15. By this movement, the bent portion 11a ejects the cassette 1 to the outside of the conversion 5. Also, slide plate A11 is pushed by pushing slide plate B12 at the same time.
Rack portion 12a, gears 21 and 22 provided on the gear plate 20
The movement is transmitted to the ratchet 23 via the, and an integrally provided cam (described later) is returned to the initial position. At this time, by moving the head plate 98 arranged on the back side of the base plate 9 in the direction of arrow 99 by an external force, this movement is transmitted to the slider 16, the cam follower 24 is separated from the cam, and the head 13 is moved to the initial position. . The slider 16 includes slide shafts 27a and 27a held by slide blocks 25 by holding springs 26a to 26c (26d is described later) and adjusting screws (described later).
It moves along b and is spring biased to the cam side. Therefore, when no force in the direction of arrow 99 is applied to the head plate 98, the head plate 98 contacts the cam.

In the garage 8, the spring 28 is the spring hook portion of the base plate 9.
By being hooked to 29 and the spring hook 30 of the garage, it always tries to open and the spring 31 biases the compartment 5 away from the garage 8. now,
Insert the cassette 1 into the compartment 5 and close the garage 8.
It descends until it abuts 32, and cassette 1 has its positioning hole.
33a and 33b are fitted and positioned to the positioning pins 34a and 34b, and the height is determined by the two pins and the height determining pin 35. During this time, the switch 37 that engages with the erroneous erasure prevention claw 36 of the cassette 1 is pushed to the position where it does not engage with the cassette 1 by the protrusion 38 of the garage 8. After this,
When the garage 8 descends, the presser springs 39 hold the cassette 1 and the insertion springs 40 rotate the spindle 42 of the motor 41.
Push the center core (described later) into. Also, pad spring
The pad plate 44 held in the garage 8 by 43
The PG 45 and the pad 46 are provided, but also in these, the pad height determining pins 47a and 47b are in contact with the pad plate 44, and the pad plate positioning pin 48 is provided in the central portion (described later) of the spindle 42. Pad plate positioning hole 42
Positioned by fitting into a. After completing these operations,
The lock hole 49 of the garage 8 engages with the lock 50 to fix the garage 8. To release, the pressing portion 50a is pushed against the spring 51 so that the lock 50 is disengaged.

In this way, the cassette 1 is fixed on the base plate 9 and recording is performed by the head 13. The operation of each part, particularly the present invention, will be described in more detail with reference to the drawings.

FIG. 2 is an explanatory view of the cassette 1 used. The built-in magnetic disk 52 is attached to the center core 53. The center core 53 is provided with positioning walls 54a, 54b, a positioning spring 55, and a PG yoke 56, and is positioned with respect to the spindle 42. The housing 57 has the positioning holes 33a and 33b as described above, and is positioned by the positioning pins 34a and 34b and the height determining pin 35. 58 has shutter 2 and arrow 3
2'after sliding in the direction, the windows are provided in the same shape on both sides of the casing 57 to expose the magnetic disk 52,
The pad height determining pins 47a and 47b also use the inside of the window 58. Five
9 is a label, which allows you to write down the date used and organize it. The 36 erroneous erasure prevention claws are provided on the back side and are used to prevent accidental erasure of recorded contents or to prevent overwriting.

FIG. 3 shows the structure on the base plate 9. The spindle 42 is provided with a pad plate positioning hole 42a into which the pad plate positioning pin 48 fits.

Hereinafter, how the cassette 1 is installed in the apparatus and how the cassette 1 and the pad 46 are positioned will be described.

In FIG. 4, A is an open state and B is a state in which the cassette 1 is set in the motor 1. As seen in Figure 5,
Two positioning pins 34a, 34b for positioning the cassette 1
Is located far from the rotation axis of the garage 8 and the compartment 5 connecting the support shafts 10a and 10b, and it is the motor 41 and the pad 46 that influence the attachment / detachment of the cassette 1. In this embodiment, the opening angle of these members is set to be the smallest in using the cassette 1 depending on the axial direction of the garage 8 and the position of the pad 46 entering the window 58 of the cassette 1. It is configured to escape in the state. That is,
When the cassette 1 is detached, its opening angle is minimized to prevent intrusion of dust or the like and contact with the inside such as fingers. The opening angle of the garage 8 is determined by the contact with the member having the support shaft 10b, and the opening angle of the compartment 5 with respect to the garage 8 is determined by the protrusion 83 of the compartment 5. Now from Fig. 4A to 4
In the movement to FIG. B, the insertion spring 40 is located above the compartment 5 in A so that the cassette 1 can be attached and detached. When the garage 8 is lowered as it is, the cassette 1 is set on the moat 41 while the relative angle between the garage 8 and the compartment 5 is held by the spring 31. The center core 53 is inserted into the spindle 42, but at that time, there is some resistance, and the insertion may be incomplete. After the compartment 5 is stopped, only the garage 8 continues to descend, and the insertion spring 40 presses the center core 53 to surely push it into the spindle 42.
Further, when the garage 8 is rotated downward, the upper protruding piece 84 of the compartment 5 and the insertion spring 40 come into contact with each other. Therefore, the tip 40a is separated upward from the center core 53, as shown in FIG. 4B, and does not become a load for rotating the center core 53. As described above, the insertion spring 40 provided in the garage 8 has a simple structure of one leaf spring, but can securely insert the center core 53 into the spindle 42.
The separating operation thereafter can be performed, which is valuable.

Similarly, the pad spring 44 provided on the garage 8 urges and holds the pad plate 44 on the base plate 9 side, and the spindle 42 and the pad height determining pins 47a and 47b are supported in contact with each other, so that the height of the pad plate 44 is accurately adjusted. It is determined.

Fig. 5 shows that when the garage 8 is lowered and locked,
The pad plate 44 is the spindle 42 or the pad height determining pin.
It shows what the positional relationship is with respect to 47a and 47b. Pad plate positioning pin 48
The pad horizontal positioning convex portion 46a provided on the pad 46 is fitted in the pad plate positioning hole 42a provided in the pad 42, and fitted in the space between the two pad height determining pins 47a, 47b. FIG. 6 is an enlarged view of the vicinity of the spindle 42 at this time as seen from the Y direction. The pad plate positioning pin 48 is chamfered 48a, and the pad plate positioning hole 4
Aligned automatically when inserted into 2a. Figure 7 shows
FIG. 6 is an enlarged view of the vicinity of a pad 46 as seen from the X direction in FIG. The pad height determining pins 47a and 47b have rounded ends, and the pad horizontal positioning convex portion 46a provided on the pad 46 is provided.
However, it smoothly enters into the space between the pad height determining pins 47a and 47b.

As described above, in this embodiment, the spindle 42 and the pad height determining pins 47a and 47b reliably position the pad plate and its horizontal position with respect to the spindle. That is, the pad is reliably positioned with respect to the disc. Therefore, a good contact state between the magnetic disk and the magnetic head can always be maintained. Further, as can be seen from FIG. 2, the positioning mechanism is contained within the area occupied by the cassette 1 in plan view. Therefore, it is advantageous for making the device compact.

In this embodiment, the positioning of the pad plate 44 with respect to the spindle 42 is performed by positioning the spindle 42 with the positioning hole 42a.
Was carried out with the spindle 42 as shown in FIG.
Pad plate positioning pins 42b to pad plate 4
It goes without saying that the same effect can be obtained even if the pad plate positioning hole 44a is provided in the position 4.

As described above, according to the present invention, the pad is always accurately positioned with respect to the rotation center of the magnetic disk, so that the contact between the magnetic disk and the magnetic head is always kept good, and Extremely reliable. Further, the horizontal positioning means of the pad is inside the magnetic disk exclusive area of the device in plan view, which is advantageous for downsizing of the device.

Further, in the present invention, one positioning means is constituted by the two pins and the convex portion fitted between the pins. Therefore, the distance between the pins can be sufficiently close, and the pad can be downsized. As a result, a pad corresponding to a small opening formed on the magnetic disk cassette side can be realized, and the device can be made compact and highly reliable.

[Brief description of drawings]

1A and 1B are configuration diagrams of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of a cassette used in the device, FIG. 3 is an explanatory diagram of main parts of the device, and FIG. FIGS. A and B are operation explanatory views of the same apparatus, FIG. 5 is a positional relationship diagram of a spindle, a head and a pad, FIGS. 6 and 7 are principal part explanatory views, and FIG. 8 is another embodiment. It is a block diagram. 13 …… Head, 42 …… Spindle, 42a …… Pad plate positioning hole, 44 …… Pad plate, 45 …… PG, 46
...... Pad, 46a …… Pad horizontal positioning protrusion, 47a, 47b
...... Pad height determining pin, 48 …… Pad plate positioning pin.

Claims (3)

(57) [Claims] 1. A magnetic disk device comprising a magnetic head for recording / reproducing information on / from a magnetic disk, a spindle for rotating the magnetic disk, and a pad for pressing the magnetic disk against the magnetic head. The pad is fixed to the pad plate, two pad height determining pins are provided on the fixed substrate of the spindle, and the pad is fitted in the space between the two pad height determining pins. The present invention is characterized in that a convex portion is provided, and first positioning means configured by the pad height determining pin and the convex portion, and second positioning means for fitting the pad plate into the central portion of the spindle tip are provided. And a magnetic disk device. 2. The magnetic disk drive according to claim 1, wherein the spindle is provided with a pad plate positioning hole, and the pad plate is provided with a convex portion that fits into the positioning hole. 3. The magnetic disk drive according to claim 1, wherein the pad plate is provided with a pad plate positioning hole, and the spindle is provided with a convex portion that fits into the pad plate positioning hole.