JPH035014Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head device used in a magnetic disk recording/reproducing device.

[Prior art]

In a double-sided magnetic disk recording/reproducing device in which the magnetic head device consists of an upper head assembly and a lower head assembly, the upper head assembly has a gimbal-type head, and the lower head assembly has a button. A type head is often used, and a disk is inserted between both head assemblies to write and read information. Here, the button-type head is one that is made by fixing a convex head holder with a head embedded in it to a support member, and
A gimbal type head is one in which a gimbal spring to which the head is attached is fixed to or in contact with a support member.

FIG. 3 is a sectional view showing a conventional magnetic head device of this type. In the figure, 5 is a disk, 24 is a carriage, 25 is a lower head fixed to the carriage 24, 26 is an arm, 28 is an upper head swingably attached to the arm 26 via a gimbal spring 27, and 29 is a lower head fixed to the carriage 24. a pivot portion 3 formed on the arm 26 and supporting the upper head 28;
0 is a leaf hinge spring that allows the arm 26 to rotate in the direction in which both heads 25 and 28 face each other, 31 is a mounting bracket, and 32 is a mounting bracket 31 and the arm 26.
1 and 2, each representing a compression spring that is interposed between and presses the arm 26 downward.

[Problem that the invention attempts to solve]

As described above, in the prior art, the lower head 25 is fixed to the carriage 24, and the upper head 28 is supported by being fixed to or in contact with the pivot portion 29, so both heads 25, 28 have no elasticity. However, when the arm 26 is lowered to bring the upper head 28 into contact with the disk 5, the impact often damages the disk 5.

Therefore, the technical object of the present invention is to prevent damage to the disk due to impact when the upper head contacts the disk by providing elasticity to the lower head.

[Means for solving problems]

In order to solve the above technical problems, the present invention attaches the lower head 8 to the carriage 1 via a gimbal spring 7 so as to be able to swing freely, and also urges the lower head 8 upwardly by the spring 10. , an upper head 15 is fixed at a position facing the lower head 8 on an arm 2 rotatably connected to the carriage 1, and a first contact portion 11 that abuts the support portion 22 of the arm 2 is attached to the carriage 1. In addition, a second contact part 12 that contacts the arm 2 other than the first contact part 11 is provided, and the arm 2 rotates in the direction of the carriage 1 about the first contact part 11. It is characterized by being biased.

[Effect]

The above technical means works as follows. The lower head 8 is attached to the gimbal spring 7 and is pressed upward by the compression spring 10, so it is always elastic and moves down the arm 2 to reach the upper head 1.
Since the impact when the disk 5 is brought into contact with the disk 5 is absorbed by the elasticity of the gimbal spring 7 and the compression spring 10, the disk 5 is less likely to be damaged. On the other hand, the upper head 15 is fixed to the arm 2, and when the upper and lower heads 8, 15 sandwich the disk 5, the support part 22 of the arm 2 and the part closer to the upper head 15 are connected to the carriage. 1 first and second contact portions (protrusions) 11,
12, and the tension spring 13 always urges the arm 2 toward the carriage 1, so that the heightwise position of the upper head 15 remains constant during information writing and reading. So, write
During reading, the elastic lower head 8 follows the upper head 15, which serves as a positional reference.

〔Example〕

The details of the present invention will be explained below based on examples. Figure 1 shows one of the magnetic head devices of the present invention.
FIG. 2 is a sectional view showing the embodiment in a state in which the arm is lifted up in FIG. 1. In these figures, the magnetic head device is shown in carriage 1.
It consists of an arm 2, a leaf hinge spring 3, etc., and is moved in the radial direction of the disk 5 along a guide shaft 4 by a pulse motor (not shown).

First, the configuration of the carriage 1 will be described. 6
is the base material of the carriage 1, which is made of insulating synthetic resin. 7 is a gimbal spring made of a thin metal spring plate attached to the tip of the base member 6, and 8 is a lower head fixed to the gimbal spring 7. Reference numeral 9 denotes a support member having a pressing part 9a, a fulcrum part 9b, and a pivot part 9c. The portion 9c is the compression spring 1
The lower head 8 is pressed upward by a force of 0. Further, first and second protrusions 11 and 12 that come into contact with the arm 2 are formed on the rear part of the base material 6,
Further, a tension spring 13 is provided between the first and second protrusions 11 and 12, and urges the arm 2 toward the carriage 1.

Next, the configuration of the arm 2 side will be described. 14
is the base material of the arm 2, which is made of insulating synthetic resin. 15 is an upper head fixed to the tip of the base material 14; 16 is a lifting arm for rotating the arm 2 upward; 17 is screwed onto the base material 14 and abuts on the second protrusion 12; This is the adjustment screw that is in contact. The leaf hinge spring 3 is made of a metal plate, and one end of the leaf hinge spring 3 is connected to the arm 2.
is fixed to the rear end of the base member 14 with a screw 18 and a nut 19, and the other end is fixed to the carriage 1 with a screw 21 via a mounting fitting 20.
Reference numeral 22 denotes a substantially rectangular rod-shaped support portion formed on both sides of the rear end of the base material 14, and its bulging portion 22a is located between the first protrusion 11 of the base material 6 and the mounting bracket 20. In the formed recess 23, it directly contacts the first protrusion 11 and faces the lower surface of the mounting bracket 20 with a slight gap therebetween.

In the above configuration, when the disk 5 is not inserted, the arm 2 has its lifting arm 16 lifted by a lifting mechanism (not shown), and the pair of supporting parts 22
The upper head 15 is held at the position shown in FIG. Since the compression spring 10 presses the pressing portion 9a of the support member 9 downward,
The pivot portion 9c presses the lower head 8 upward with the fulcrum portion 9b as the center of rotation. The height position of the lower head 8 at this time is regulated by the state in which the upper surface of the support member 9 is in contact with the lower surface of the base member 6 of the carriage 1. Further, the only part of the arm 2 that is in contact with the carriage 1 is the abutting part between the support part 22 and the first protrusion 11, but if the arm 2 is suddenly lifted up, the support part 22 and the mounting bracket 2
0, so that excessive bending stress is not generated in the leaf hinge spring 3.

On the other hand, when the disk 5 is inserted and clamped, the upper lifting restraint of the arm 2 by the lifting mechanism is released in conjunction with this,
Arm 2 is lowered by the elastic force of tension spring 13, and both heads 8 and 15 sandwich disk 5 so that information can be written and read.
In the above writing/reading state, the support part 22 is the first
The part that comes into contact with the protrusion 11 and the adjustment screw 17
is the part that comes into contact with the second protrusion 12. Also,
At the position where both heads 8 and 15 sandwich the disk 5, the downward elastic force of the upper head 15 is much stronger than the upward elastic force of the lower head 8, and the compression spring 10 and the tension spring 13 The spring force relationship between the upper head 15 and the lower head 8 is set so that the heightwise position of the upper head 15 is not affected by the elastic force of the lower head 8. Therefore, the relative positional relationship of the upper head 15 fixed to the arm 2 is maintained by the abutting portions of the carriage 1 and the arm 2, and the elastic lower head 8 follows the upper head 15. It's becoming like that. Furthermore, by providing the adjustment screw 17 that abuts the second protrusion 12, the arm 2 can be freely moved in the vertical direction by turning the adjustment screw 17. As a result, even if the reference positions of the heads 8 and 15 in the height direction vary due to dimensional errors of parts or dimensional errors during assembly,
The position can be finely adjusted by turning the adjustment screw 17.

〔effect〕

As mentioned above, in this invention, the lower head has elasticity due to the gimbal spring and the compression spring, so the impact when the arm descends and the upper head contacts the disk is absorbed by the elasticity. Therefore, it is possible to prevent damage to the disk due to impact.

[Brief explanation of the drawing]

1 and 2 are sectional views showing one embodiment of the magnetic head device of the present invention, and FIG. 3 is a sectional view showing a conventional example of the magnetic head device. DESCRIPTION OF SYMBOLS 1... Carriage, 2... Arm, 7... Gimbal spring, 8... Lower head, 10... Compression spring, 11... First protrusion, 12... Second protrusion,
15...Upper head, 17...Adjustment screw.

Claims (1)

[Scope of utility model registration request] The lower head is swingably attached to the carriage via a gimbal spring, the spring urges the lower head upward, and the lower head is connected to an arm rotatably connected to the carriage. The upper head is fixed at an opposing position, and the carriage is provided with a first abutting part that abuts the support part of the arm, and a second abutting part that abuts the arm at a position other than the first abutting part. Provide a contact part,
A magnetic head device characterized in that the arm is biased to rotate in the direction of the carriage about the first contact portion as a rotation center.