JPH01307066A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To prevent the magnetizing and sticking of an operation member and to reduce an impact sound due to the impact by regulating the moving limit of the operation member so that the operation member cannot be abutted to the fixed iron core of an electromagnet at the time of attracting a moving operation member by the electromagnet and providing a buffering member to buffer the impact when the operation member is stopped. CONSTITUTION:When a magnetic head 2 of a magnetic disk device is retracted and the conducting of a coil 8 is interrupted, an armature 11 is turned in a (b) direction by the spring force of a spring 12, the left edge part of the armature 11 is abutted to the right edge part of a carriage 3, and when the force of the spring 12 is larger than the force of a spring 6, the carriage 3 is moved with a guide shaft 5 as a center in a B direction by the pressure of the armature 11. Thus, the head 2 is moved in the B direction and moved to the retracting position away from the magnetic disk. From the condition at the time of recording and reproducing, the coil 8 is conducted, an excited fixed iron core 9 attracts the armature 11, is turned in an (a) direction, the right side part is abutted to a rubber damper 13 and stopped at the position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording or reproducing apparatus for recording or reproducing information on or from a disk-shaped rotating recording medium.

[Prior Art] As this type of recording or reproducing apparatus, there is a magnetic disk apparatus that magnetically records or reproduces information on a magnetic disk of a rotating magnetic recording medium. The magnetic disk device has
A head retraction mechanism is provided that allows a magnetic head for recording or reproducing to approach a magnetic disk during recording and reproducing, and moves it to a retracted position away from the magnetic disk when necessary.

There are various types of head retraction mechanisms. As one method,
Bring the helad carriage of the magnetic head close to the magnetic disk,
The head carriage is provided so as to be rotatable in the direction away from the disk, is biased toward the disk by a spring, and is pressed or released in the direction away from the disk by a movable armature driven by an electromagnet. Depending on the situation, there is a method in which the head carriage is rotated in the direction of separation or approach. In this case, the armature is provided so as to be rotatable in the direction in which it presses the head carriage and in the opposite direction, and is biased in the pressing direction by a spring having a stronger spring force than the panel that biases the head carriage. Then, it is rotated in the opposite direction to the pressing direction by the attractive force of the electromagnet.

With this configuration, during recording and reproduction, the electromagnet is energized and the armature is rotated in the opposite direction to the pressing direction against the biasing force of the spring, so that the head carriage approaches the magnetic disk due to the bias of the spring. The magnetic head accesses the magnetic disk. In addition, when the magnetic head is retracted, by cutting off the power supply to the electromagnet, the armature released from the electromagnet presses the head carriage in the direction away from the magnetic disk by the biasing force of the spring, and the magnetic head is retracted away from the magnetic disk. driven into position.

[Problems to be Solved by the Invention] However, according to the structure of the head retraction mechanism of the above type, when the armature made of magnetic material is attracted by the fixed iron core of the electromagnet, it becomes magnetized or sticks to the fixed iron core. As a result, even if the electromagnet is de-energized, the armature remains attached to the fixed iron core, making it impossible to evacuate the magnetic head.

Further, in this structure, when the armature is attracted by the electromagnet, an impact noise is generated due to the impact when the armature comes into contact with the fixed iron core of the electromagnet. This impact sound is a harsh noise, and if a magnetic disk drive is installed in an electronic still camera, for example, the impact sound can easily be confused with the shutter release sound when the camera shutter is released. There were drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording or reproducing apparatus equipped with the above-mentioned type of head retraction mechanism, which is capable of preventing magnetization and adhesion of the armature as described above, as well as reducing impact noise of the armature. Or to provide playback equipment.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, the recording or reproducing head approaches the disc-shaped rotating recording medium by attracting or releasing the movable operating member using an electromagnet. Alternatively, in a recording or reproducing apparatus equipped with a head retraction mechanism that separates the operating member, a movement limit of the operating member is regulated so that the operating member does not come into contact with a fixed iron core of the electromagnet when the operating member is attracted by the electromagnet, and the operating member is The structure is equipped with a shock absorbing member that absorbs the impact when the machine stops.

[Function] According to this structure, when the operating member is attracted by the electromagnet, the regulation of the buffer member prevents the operating member from coming into contact with the fixed iron core of the electromagnet, and the impact when the operating member stops is buffered. Ru. Therefore, it is possible to prevent the above-mentioned operation member from becoming magnetized or stuck, and it is also possible to reduce the impact noise caused by the above-mentioned impact.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

1 Retired Emperor 1 FIGS. 1 and 2 are a plan view and a sectional side view of the vicinity of a head retracting mechanism, respectively, for explaining the structure of the head retracting mechanism of a magnetic disk device according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a spindle motor, and the center of a magnetic disk (not shown) is fitted onto its spindle shaft 1a, and the magnetic disk is driven to rotate at a predetermined rotational speed by driving the spindle motor 1. ing.

Further, reference numeral 2 denotes a magnetic head which is the main body for recording or reproducing, and is mounted on a head carriage (hereinafter abbreviated as carriage) 3.

The carriage 3 is slidably mounted on the guide shaft 5 in the directions of arrows C and D, with a guide shaft 5 inserted through a bearing 4 provided at the left end in the figure. By driving the carriage 3 in the C1D direction by a driving means (not shown), the magnetic head 2 is moved along the radial direction of the magnetic disk (not shown). Also carriage 3
is provided so as to be rotatable in the directions of arrows A and B to approach and move away from the magnetic disk around the guide shaft 5, and is further biased in the A direction by a spring 6.

A regulating shaft 7 is installed above the right end of the carriage 3 in the figure, and when the carriage 3 comes into contact with this regulating shaft 7, the rotational limit of the carriage 3 in the direction A is restricted. There is. As will be described later, it is assumed that the carriage 3 is positioned at the position shown in the figure when the magnetic head 2 is retracted.

On the other hand, an electromagnet consisting of a fixed iron core 9, a coil 8 wound around the fixed iron core 9, and a yoke 10 for guiding magnetic flux is provided near the illustrated position of the carriage 3. In this case, the fixed iron core 9 is assumed to have a T-shaped cross section and a disk-shaped upper part. A ring-shaped rubber damper 13 is fitted onto the outer periphery of the disk-shaped upper part of the fixed iron core 9, and is fixed by adhesive or baking. The upper surface of the rubber damper 13 projects slightly above the upper surface of the fixed iron core 9.

Next, on the electromagnet having the above structure, an armature 11 which is an operating member made of a magnetic material is provided so as to be rotatable in the directions of arrows a and b using its center as a fulcrum. A spring 12 is stretched on the lower surface of the left end of the armature 11 in the figure, which is bent into an L-shape.
11 is biased in the b direction. The force applied to the armature 11 by the spring 12 is set to be larger than the force applied to the carriage 3 by the spring 6. Further, the right end portion of the armature 11 in the figure faces onto the fixed iron core 9 of the electromagnet.

Next, the operation of the head retraction mechanism having the above structure will be explained.

First, when the magnetic head 2 is retracted, the coil 8 is de-energized. Therefore, the armature 11 rotates in the direction indicated by the arrow in FIG.
Since the biasing force of is larger than the biasing force of the spring 6, the carriage 3 rotates in the direction B around the guide shaft 5 due to the compression of the armature 11. Along with this, the magnetic head 2
rotates in direction B and moves to a retracted position away from the magnetic disk (not shown).

From this state, during recording and reproduction, the coil 8 is energized, and the energized fixed iron core 9 attracts the armature 11. The armature 11 rotates in the direction a, and the right side is the rubber damper 13.
By coming into contact with , it will stop at that position. Along with this rotation, the carriage 3 is rotated in six directions by the biasing force of the spring 6 until the right end portion comes into contact with the regulating shaft 7. Along with this, the magnetic head 2 approaches the magnetic disk and moves to a position where recording and reproduction are possible.

Note that during this operation, the armature 11 comes into contact with the rubber damper 13 and stops, but the upper surface of the rubber damper 13 touches the fixed iron core 9.
Since it protrudes from the upper surface, it does not collide with the upper surface of the fixed iron core 9. The impact when the armature 11 stops is damped by the rubber damper 13, and the impact noise caused by the impact is reduced. In addition, since the armature 11 is held at a position slightly apart from the fixed iron core 9 in the stopped state as shown in the figure, the armature 11 is not magnetized or stuck to the fixed iron core 9 as in the conventional case. This can be prevented.

Next, FIG. 3 shows the structure of a head retraction mechanism according to a second embodiment of the present invention. In the figure, the first
Components common or corresponding to those in the figures and FIG. 2 are given the same reference numerals. Explanation of common parts will be omitted.

As shown in FIG. 3, this embodiment differs from the first embodiment in that a rubber damper is not provided on the fixed iron core 9, and instead, a base 15 is fixed to which the electromagnet of the head evacuation mechanism of the magnetic disk device is fixed. A rubber damper 14 is provided at. The rubber damper 14 is provided on a convex portion 15a protruding from the base 15 near the right side of the electromagnet, and the upper surface of the rubber damper 14 is slightly higher than the upper surface of the fixed iron core 9 of the electromagnet. When the armature 11 rotates in the direction a due to the energization of the coil 8 during recording and reproducing as shown in the figure, the right end of the armature 11 in the figure moves to the rubber damper 1.
4, and its rotational limit is restricted. Since the upper surface of the armature 14 is higher than the upper surface of the fixed iron core 14, the armature 11 is restricted from coming into contact with the upper surface of the fixed iron core 9, as in the first embodiment. Also, as in the case of the first embodiment, a of the armature 11 is
The impact at the time of stopping rotation in the direction is buffered via the rubber damper 14.

With this structure as well, it is possible to reduce the above-mentioned impact noise and prevent magnetization of the armature 11 and adhesion to the fixed iron core 9, just as in the case of the first embodiment.
The reliability of the head retraction mechanism can be improved. Moreover, with this structure, the thickness of the rubber damper 14 can be increased regardless of the shape of the fixed iron core 9 of the electromagnet, and the above-mentioned impact buffering effect can be increased, and impact noise can be further reduced.

In the structure of the second embodiment described above, the rubber dampers 13 and 14 are provided on the fixed iron core 9 or the base 15, but the rubber dampers may be fixed to the armature 11 by gluing or baking.

Further, instead of the rubber damper, a damper made of another elastic material may be used.

[Effects of the Invention] As is clear from the above description, according to the present invention, a recording or reproducing head can be moved toward or away from a disk-shaped rotating recording medium by attracting or releasing a movable operating member using an electromagnet. In a recording or reproducing device equipped with a head retraction mechanism that causes the operating member to move, the operating member is stopped by regulating the movement limit of the operating member so that the operating member does not come into contact with a fixed iron core of the electromagnet when the operating member is attracted by the electromagnet. The structure is equipped with an impact member that cushions the impact when the operating member is moved. This prevents the operating member from becoming magnetized and the electromagnet from sticking to the fixed iron core, improving the reliability of the head retracting mechanism, and improving the reliability of the operating member. An excellent effect can be obtained in that the impact noise caused by the impact at the time of stopping is reduced, and the noise of the device can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the vicinity of the head retraction mechanism of a magnetic disk drive according to a first embodiment of the present invention, and FIG. 2 is a side sectional view of the vicinity of the head retraction mechanism. FIG. 7 is a side cross-sectional view of the vicinity of the head retracting mechanism for explaining the structure of the head retracting mechanism according to the second embodiment. 1... Spindle motor 2... Magnetic head 3... Head carriage 4
...Bearing 5...Guide shaft 6.12...
・Spring 7...Regulation shaft 8...Coil
9...Fixed iron core 10...-”i-ri it・
... Armature 13, 14 ... Rubber damper 15 ... Base

Claims (1)

[Claims] 1) A recording or reproducing device equipped with a head retraction mechanism that moves a recording or reproducing head toward or away from a disk-shaped rotating recording medium by attracting or releasing a movable operating member using an electromagnet. , a limit of movement of the operating member is regulated so that the operating member does not come into contact with a fixed iron core of the electromagnet when the operating member is attracted by the electromagnet, and a buffer member is provided to buffer the impact when the operating member stops. A recording or reproducing device characterized by: 2) The recording or reproducing device according to claim 1, wherein the buffer member is fixedly provided to the operating member.