JPH03219473A - Transducer supporting device - Google Patents

Abstract

PURPOSE:To improve stability in the floating of a transducer by comprising a fixed part of a flat part and a flange part provided at a side plane, and comprising an arm part of a triangular flat part and a bent part provided at the side plane. CONSTITUTION:The transducer 138 is supported with a gimbal spring 126 in such a way that it can be turned. The spring 126 is welded at the tip part of a load beam 110. The beam 110 consists of the fixed part 124, an elastic spring part 116, and the arm part 118. The arm part 118 is provided with the triangular flat part 119 and the bent parts 120 at both side planes in the longitudinal direction of the flat part 119. The fixed part 124 is provided with the flat part 123 and the flange parts 122 provided at both side planes of the part 123, and whose one terminal is fixed on a rigid arm 114. By employing such constitution, the rigidity of the fixed part 124 can be improved with the flange part 122. Therefore, mass supported with the spring 116 can be reduced, and the frequency of a resonance mode can be set higher by improving the rigidity in a direction of arrow head B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transducer support device for a disc-shaped recording and reproducing device that records and reproduces information by floating a transducer above a disc-shaped recording and reproducing medium. .

Conventional technology Recording and reproducing devices that record and reproduce information while maintaining a constant distance between a disk-shaped recording and reproducing medium and a transducer have been improving their recording surface density year by year9. The distance between the recording and reproducing medium is 0.
The track width is about to become 2 μm or less, and the track width is also about to become 10 μm or less. In order to further improve the areal recording density in the future, it is essential to improve the characteristics of the support device that supports the transducer.

Conventional transducer support devices (for example, JP-A No. 5
It is described in Japanese Patent No. 5-22296 and is shown in FIGS. 5 and 6. FIG. 6 is a front view of FIG. 5. The transducer support system consists of a triangular load beam 10 and a gimbal section 26 spot welded to the triangular load beam 10 at spots 28. The load beam 10 consists of an elastic spring section 16, a flat section 18 and a bent section 20. The elastic spring portion 16 of the load beam 10 is elastically deformed in the out-of-plane direction A (see FIG. 6), thereby causing the magnetic recording medium 2 to be attached to the transducer 38.
Provides a force that resists the buoyancy force caused by the airflow that accompanies the rotation of 4. The pivot 42 is set so that the transducer 38 can flexibly follow the undulations of the magnetic recording medium 24. Load beam 10 is secured to rigid arm 14 by screw member 12 .

The transducer support device as described above has several vibration modes as shown in FIG. 4, and these vibration modes exist in a low frequency region. These vibration modes include wind disturbance due to the rotation of the magnetic recording medium 24, disturbance due to friction with the surface of the magnetic recording medium, or seek movement in the radial direction of the magnetic recording medium 24 in order for the transducer 38 to move to a predetermined track. In particular, the load beam 10 vibrates significantly due to disturbances such as acceleration/deceleration during operation. Vibrations caused by these vibration modes can destabilize the tracking control system, reduce positioning accuracy with respect to the target track, degrade the flotation characteristics of the transducer 38, and, in the worst case, cause a crash. There is a problem in that the load applied to the transducer 38 varies due to variations in the thickness of the plate-like members that constitute the transducer support device, and the size of the gap between it and the magnetic recording medium 24 changes. These problems have become more and more serious as the track width decreases as the recording surface density increases and the gap between the magnetic recording medium and the transducer 38 decreases. The problem to be solved by the above-mentioned transducer support device (like
The first problem is that the mass supported by the elastic spring section 16 is large, the structure is in the form of a leaf spring, and the rigidity against external disturbances in the out-of-plane direction is low.E, the above-mentioned low frequency vibration mode occurs. In order to increase the resonant frequency, flat part 1
A sword that is effective by shortening the length of 8 Magnetic recording medium 24
In order to move the transducer 38 to all the tracks recorded on the track, the length of the rigid arm 14 must be increased, which increases the weight of the movable part and causes the problem that seeking takes time. The second problem is that variations in the thickness of the plate-like members that make up the transducer support device increase variations in the load applied to the transducer, necessitating fine adjustments during manufacturing. Means for Solving the Problems In order to solve the above-mentioned problems, in the first invention, the structure of the load beam has a fixed part, an elastic spring part, and an arm part, and the fixed part has a flat part and the flat part. a flange portion on at least one side along the longitudinal direction; one end of the fixed portion is fixed to a rigid arm, and the elastic spring portion is disposed at the other end; has a flat plate shape that can be elastically deformed in an out-of-plane direction, and has an arm portion at an end opposite to the fixed portion, and the arm portion includes a triangular flat portion and at least one side of the triangular flat portion. has a bent portion provided along the longitudinal direction, and the gimbal spring is fixed to an apex of the triangular flat portion; and in a second invention, at least one hole is formed in the elastic spring portion. Effects of the above-mentioned structure By using the above structure, the length of the flat part on the triangle can be shortened without increasing the length of the rigid arm, and the resonant frequency of the load beam can be increased, which reduces the mass of the moving parts of the device. The weight can be reduced and the seek time can be shortened.

Furthermore, as the length of the flat portion on the triangle becomes shorter, variations in the load applied to the transducer increase due to variations in the thickness of the plate members constituting the transducer support device. By providing the holes, the magnitude of variation in the load applied to the transducer can also be freely set.

EXAMPLE Hereinafter, an example of the present invention will be explained using FIGS. 1 and 2.

FIG. 1 is a plan view showing one embodiment of the transducer support device of the present invention; FIG. 2 is a front view of FIG. 1; FIG.

The magnetic recording medium 24 is rotating in the direction of arrow B, and the transducer 138 is floating above the magnetic recording medium 24 while maintaining a constant gap with the magnetic recording medium 24.

The transducer 138 is a gimbal spring 126 in the form of a thin plate.
It is supported so as to be flexibly rotatable about a pivot 142 as a fulcrum. The gimbal spring 126 is spot welded to the tip of the load beam 110 by a spot portion 128. The load beam 110 consists of a fixed part 124, an elastic spring part 116, and an arm part 118.

The arm portion 118 has a substantially triangular flat portion 119 and bent portions 120 on both sides of the triangular flat portion 119 along the longitudinal direction. The elastic spring portion 116 has a plate-like structure that can be elastically deformed in the direction of arrow A, and when this portion is elastically deformed, a load is applied to the transducer 138, which is caused by the air flow generated by the rotation of the magnetic recording medium 24. This suppresses floating of the transducer 138 due to buoyancy force. The fixed part 124 has a flat part 123 and flange parts 122 provided on both sides of the flat part 123,
One end is fixed to a rigid arm 114 by a screw member 112. According to the above configuration, the fixing part 124
The rigidity is improved by the flange portion 122, and the effect is as if the rigid arm 114 were extended. The resonance mode (see FIG. 4), which has been a problem in the past, is caused by the rigidity and mass of the elastic spring section 116 and the arm section 118. Therefore, by reducing the length of the arm part 118, the mass supported by the elastic spring part 116 is reduced, and by increasing the width of the elastic spring part 116, the rigidity in the direction of arrow B is improved. The frequency of the resonance mode can be increased.

Next, the second invention will be explained using FIG. 3.

As shown in FIG. 3, a hole 132 is provided in the elastic spring portion 116 of the above transducer support device.

The magnitude of the load applied to the transducer 138 is proportional to the moment force generated by the springiness of the elastic spring portion 116, and the springiness is determined by the elastic modulus, thickness, and width L of the plate member constituting the elastic spring portion 116. (See Figure 1). In particular, the variation in moment force due to variation in plate thickness becomes particularly severe when a force is generated in the direction of the arrow A (see diagram A Cm2).

Generally, the load applied to the transducer is 7g to 9g.
g, and the allowable range is ±0.5 g or less. In order to set this load within an allowable range, it is necessary to take measures such as reducing the plate thickness or making subtle adjustments during manufacturing. Reducing the plate thickness leads to lowering the frequency of the resonance mode.

However, according to the second embodiment of the invention, by providing the hole 132 as shown in FIG. 3, the magnitude of the moment force generated by the elastic spring portion 116 can be reduced without reducing the plate thickness. As a result, the absolute amount of variation in the load applied to the transducer 138 can be reduced, and delicate adjustments during manufacturing can be made unnecessary. One hole 132 may be provided near the center of the elastic spring portion 116 as shown in FIG. 3, or a plurality of holes 132 may be provided as shown in FIG. By improving the rigidity of the transducer support device and increasing the frequency of the resonance mode without increasing the length, it is possible to improve the stability of floating the transducer and to improve the positioning accuracy with respect to the target track. Device
According to the second invention ('!, it is possible to set variations in the load on the transducer due to variations in plate thickness, etc., to within a 9-0- permissible range without reducing the plate thickness.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the first invention. FIG.
Front view of the figure FIG. 3 is a plan view showing an embodiment of the second invention. FIG. 4 is a plan view showing the frequency characteristics of a resonance mode in a conventional example. FIG. 5 is a plan view showing a conventional transducer support device. The figure is a front view of FIG. 5.

Claims (2)

[Claims] (1) It consists of a transducer, a gimbal spring that elastically supports the transducer, and a load beam that applies a load to the transducer via the gimbal spring, and the load beam has a fixed part, an elastic spring part, and an arm part. The fixed part has a flat part and a flange part on at least one side along the longitudinal direction of the flat part,
One end of the fixed part is fixed to a rigid arm, and the elastic spring part is arranged at the other end, and the elastic spring part has a flat plate shape that can be elastically deformed in an out-of-plane direction with respect to the flat part of the fixed part. and has an arm portion at an end opposite to the fixed portion, and the arm portion includes a triangular flat portion and a bent portion provided along the longitudinal direction on at least one side of the triangular flat portion. a transducer support device, wherein the gimbal spring is fixed to the apex of the triangular flat portion. (2) The transducer support device according to claim 1, wherein at least one hole is provided in the elastic spring portion of the load beam.