JPS6295775A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To decrease the torque of a motor by providing a recording or a reproducing head with a magnet and an engaging member to engage with the lower part of a lead screw, and providing another magnet at the position opposite to the magnet provided to the head to bear the load by the head by means of the repulsion/attraction between the two magnets. CONSTITUTION:A guide shaft 11 is inserted into a hole 10b formed approximately in parallel with one side surface 10a of a recording or a reproducing head 10 that moves on an information recording medium 18, and the main body 10 is moved along the shaft 11. An elastic column-shaped engaging member 12 is fixed on the opposite side surface 10c of the main body 10. The lead screw 13 is disposed approximately in parallel with the side surface 10c. The member 12 engages with the groove at the lower part of the screw 13, and the magnet is fixed on the bottom of the main body 10. The magnet 15 is disposed under the magnet 14 with its longitudinal direction along the moving direction of the main body 10. The repulsion and the attraction between the magnets 14 and 15 are utilized in supporting the load by the main body 10 to drive the main body 10 which is of a large load by a driving motor 18 of small torque.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information recording/reproducing device for recording and/or reproducing information on an information recording medium such as a card, sheet, or disk. .

(Prior Art) Conventionally, in this type of information recording/reproducing apparatus, a mechanism shown in FIG. 4, for example, has been used as a feeding mechanism for a recording or reproducing head.

That is, above the disk-shaped information recording medium 1, a frame 2 is provided.
A relatively lightweight recording or reproducing head body 4 such as a magnetic head movably inserted into a guide shaft 3 disposed in the
Lead screws 5 are arranged in parallel with the moving direction (a-a' force direction) of the head body 4, and a cylindrical engagement member 6 fixed to the end surface of the head body 4 engages the upper part of the lead screw 5. By rotating a drive motor 7 such as a step motor connected to the lead screw 5, the head body is engaged with the thread groove of the lead screw 5 through the engaging member 6 engaged with the thread groove of the lead screw 5. 4 can be reciprocated in the a-a' force direction to record or reproduce information.Furthermore, the engaging member 6 engaged with the thread groove on the upper part of the lead screw 5 supports the load of the head main body 4. It also has a function.

However, when a feed mechanism having a configuration similar to the above-described feed mechanism is used for a relatively heavy head body (not shown) such as an optical head, an engagement made of a rigid material that supports the load of the RAD body is used. In order to support the load of the head body by engaging the member 6 with the thread groove on the upper part of the lead screw 5,
In addition to increasing the diameter of the engaging member 6, it is also necessary to increase the pitch interval of the threaded grooves of the lead screw 5. Therefore, the drive motor 7 for rotating the lead screw 5 requires a highly accurate drive motor 7 with a small minimum step angle, which has the drawback of increasing costs.

Further, the load of the head body is concentrated only on the contact surface between the engagement member 6 and the upper thread groove of the lead screw 5, which may impede smooth movement of the head body.

(Problems to be Solved by the Invention) The present invention has been made for the purpose of solving the problems of the above-mentioned conventional example,
It is an object of the present invention to provide an information recording/reproducing device that can smoothly move the head at low cost even when using a relatively heavy recording or reproducing head such as an optical head.

(Means for Solving the Problems) As a means for solving the above problems, the present invention records or reproduces information on an information recording medium by moving a recording or reproducing head along a lead screw. In the information recording/reproducing apparatus, the recording or reproducing head is provided with an engaging member and a magnet that engage with a threaded groove at the bottom of the lead screw, and another magnet is provided at a position facing the magnet provided on the head. The gist of this is a structure in which magnets are arranged and the load of the head is supported by the repulsive or attractive force of the magnetic force between these magnets.

(Example) Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

In the first embodiment shown in FIGS. 1 and 2, reference numeral 10 denotes a relatively heavy recording or reproducing head body such as an optical head, and a hole 10b formed substantially parallel to one side surface 10a of the head body 10. A guide shaft 11 is inserted into the head body 10, and the head body 10 is movable along the guide shaft 11. Reference numeral 12 denotes a cylindrical engagement member having an elastic force and fixed to the other opposing side surface 10C. Reference numeral 13 denotes a lead screw disposed substantially parallel to the side surface 10C of the head main body 1O, and the cylindrical engagement member 12 is engaged with a threaded groove at the bottom of the lead screw 13. Reference numeral 14 denotes a magnet fixed to the bottom of the head body 10, and a magnet 15 with the same magnetic pole (S pole in the figure) repelling the magnet 14 is placed downwardly along the moving direction of the head body 10. It is arranged substantially parallel to the magnet 14. Reference numeral 16 denotes a card-shaped information recording medium such as an optical card, and the information recording medium 16 is placed below the head main body 10 so as to be sandwiched between drive rollers 17 . 18 is the lead screw 13
It is a drive motor such as a step motor that rotates 1
Reference numeral 9 denotes a frame body to which the magnet 15 is fixed with screws 20. The feeding mechanism of the recording/reproducing head according to the present invention is constructed as described above. ) when recording or reproducing the head body 10.
is fixed, and the information recording medium 1 is rotated by rotating the drive roller 17.
6 to a predetermined recording or reproducing position in the AA' direction to record or reproduce information. Next, information recording medium 1
When recording or reproducing in the B-B' force direction perpendicular to the A-A' direction of 7, when the drive motor 18 is rotated by a predetermined feed amount, the connected lead screw 13 is also rotated by a predetermined feed amount. do. When the lead screw 13 rotates, the cylindrical engagement member 12 engaged with the helical groove at the bottom of the lead screw 13 integrally works with the head body 10 in a predetermined direction of B-B' force. move to position,
Information can be recorded or reproduced. At this time, the strength of the magnetic force of the magnets 14 and 15 is adjusted so that the repulsive force of the magnetic force between the magnet 14 fixed to the bottom of the head body 10 and the magnet 15 disposed below it balances the load of the head body 10. and adjust the spacing. Therefore, the load of the head body 10 can be supported without contact by the guide shaft 11 inserted into the head body 10 and the magnetic repulsion between the magnets 14 and 15. It is also possible to reduce the load resistance when moving. Further, since the engaging member 12 has elasticity, the engaging member 12 is always engaged with the thread groove at the bottom of the lead screw 13.

FIG. 3 shows a second embodiment of the present invention, in which the same members as those in the first embodiment are given the same reference numerals and their explanations will be omitted. In this embodiment, a magnet 21 is fixed to the upper part of the head body 10, and a magnet 22 with a different magnetic pole (S pole in the figure) is attached above the magnet 21 so as to attract the magnet 21 in the direction of movement of the head body 10. It is arranged substantially parallel to the magnet 21 along the line. In this case, the load on the head body 10 is
It can be supported by the magnetic attraction between the guide shaft 11 inserted into the guide shaft 11 and the magnets 21 and 22. The other configurations are completely similar to the first embodiment described above.

(Effects of the Invention) As explained above, the information recording and reproducing device according to the present invention has the following features:
A recording or reproducing head is provided with a magnet and an engaging member that engages with the thread groove at the bottom of the lead screw, and another magnet is arranged at a position facing the magnet provided on the head, so that the magnetic field between these magnets is Even when a relatively heavy recording or reproducing head is used, the diameter of the engaging member and the pitch of the thread groove of the lead screw are Since there is no need to increase the interval, smooth feeding can be achieved at low cost without using a high precision drive motor with a small minimum step angle for the drive motor that rotates the lead screw.

Furthermore, since the load resistance when the head body moves is reduced, the rotational torque of the drive motor can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of an information recording and reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a sectional view showing the same information recording and reproducing apparatus, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a cross-sectional view showing the information recording and reproducing apparatus according to the present invention, and FIG. 4 is a perspective view showing the main part of the feeding mechanism of the recording and reproducing head in the conventional apparatus. 10...Head body, 11...Guide shaft, 1
2... Engaging member, 13... Lead screw, 14
．． 15.21.22...Magnet, 16...Information recording medium, 18...Drive motor

Claims (1)

[Claims] (1) In an information recording/reproducing device that records or reproduces information by moving a recording or reproducing head along a lead screw with respect to an information recording medium, the recording or reproducing head has a screw groove at the bottom of the lead screw. An engaging member and a magnet are provided to engage with each other, and another magnet is disposed at a position facing the magnet provided on the head, and the load on the head is reduced by the repulsive force or attractive force of the magnetic force between these magnets. An information recording and reproducing device characterized in that it is configured to be supported.