JPH04295675A - Head-feeding device - Google Patents

Abstract

PURPOSE:To obtain a device whose feed accuracy is high and which can be assembled and adjusted easily by a method wherein prescribed reinforcement parts are formed at elastic members on both sides of a coupling part at a carriage which is coupled to a lead screw. CONSTITUTION:A magnetic head 4 is fixed to and installed at a carriage 5. A coupling part 9 which is coupled to a lead screw 7b is formed via an elastic member 8. The coupling part 9 is formed nearly in the center of the elastic member 8; ribs 22 as reinforcement parts are formed at the elastic member 8 so as to sandwich the coupling part 9. Consequently, the rigidity in parts other than a part which is elastically deformed is increased, the buckling can be prevented and the carriage 5 comes into contact with a guide shaft equally. As a result, the head can be fed stably and the title device can be worked, assembled and adjusted easily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head feeding device suitable for moving a head in a recording medium drive device used in an electronic still camera or the like.

0002

[Prior Art] In recent years, still images have been photographed purely electronically using solid-state image sensors and disk-shaped recording media (hereinafter referred to as disks), recorded on rotating disks, and the reproduced images displayed on televisions. , an electronic still camera system that prints out images has been developed. In particular, in the disk drive device used for this type of camera system,
It is necessary to reduce the size and cost.

An important element of this disk drive device is a feeding device for a magnetic head (hereinafter referred to as head). Although there are many methods for this device, a lead screw is often used from the viewpoint of cost and accuracy. This supports a carriage with a fixed head on two guide shafts,
This is a device in which a carriage and a lead screw are elastically engaged with each other using a pin or needle, and the carriage is fed by the rotational force of a drive source such as a step motor. Furthermore, the present applicant proposed in Japanese Patent Application No. 175777/1988 that one of the two guide shafts and a lead screw are integrally formed. This has the effect of reducing the number of parts and eliminating the need to adjust the parallelism between the guide shaft and lead screw.

0004

[Problems to be Solved by the Invention] However, in the above method, since the guide shaft and the lead screw are integrally formed, there is a gap between the guide shaft and the carriage engaged at the guide shaft and the lead screw. A gap is created between the two. This gap causes a change in the attitude of the carriage, resulting in a decrease in head feeding accuracy and a deviation in the azimuth angle, making it difficult to process and assemble and adjust the guide shaft and carriage.

In view of the above problems, an object of the present invention is to provide a head feeding device that has high feeding accuracy and is easy to assemble and adjust.

[0006]

[Means for Solving the Problems] In order to solve the conventional problems and achieve the above object, the present invention provides a head for recording on or reproducing information from a recording medium, a rotating lead screw, the head being fixedly installed, and a carriage in which an engaging part that engages with the lead screw is formed through an elastic member, and the engaging part is formed approximately in the center of the elastic member, and the engaging part The reinforcing portions are formed approximately symmetrically across the reinforcing portions.

Furthermore, the elastic member is fixed in a direction perpendicular to the recording surface of the recording medium.

Furthermore, the carriage has a guide portion to which the bearing is fixed, and this guide portion has a protrusion in a direction perpendicular to the recording surface of the recording medium, and the guide portion has a protrusion that extends between the two ends of the elastic member. has two bent portions formed in opposite directions, one bent portion being locked to the protrusion, and the other bent portion being fixed near the guide portion.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are views showing one embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being an exploded perspective view.

The disk 2 is housed in a cartridge 1 and is supported by a spindle 3 driven by a motor (not shown). The carriage 5 includes a head support stand 20
, a first guide portion 5a, and a second guide portion 5b are formed. The head 4 is fixed to the carriage 5 via a head support 20. Further, a guide portion 7a is formed on the rotating shaft 7 of the step motor 6, which is a drive source for head feeding, so as to sandwich a lead screw portion 7b therebetween.

Sintered bearings 13 are press-fitted into both ends of the first guide portion 5a of the carriage 5 and are disposed facing each other.
It is fitted with a. Since the guide portion 7a is formed to sandwich the lead screw portion 7b, the apparent guide length becomes long. Therefore, the operation of the carriage 5 is improved, and the influence of the gap between the bearings 13 is also reduced. Further, a notch 14 is formed in the center of the first guide portion 5a of the carriage 5, and the lead screw portion 7b and an engaging portion 9, which will be described later, engage here. Furthermore, a pair of pins 12 for regulating the position of the elastic member 8 made of a leaf spring are formed on the upper surface of the first guide portion 5a so as to sandwich the notch portion 14 therebetween. A screw hole 15 for fixing the elastic member 8 with a screw is formed near the first guide portion 5a.

The elastic member 8 has a lead screw portion 7b.
An engaging portion 9 that engages with is fixedly provided, and the elastic member 8 is approximately symmetrical about this engaging portion 9. That is, as shown in FIG. 2, both ends 8b of the elastic member 8
The bent portions 8c and 8d protruding in opposite directions are connected to the pin 1.
2. The pin 12 is formed to correspond to the screw hole 15, and the hole portions 16, 1 are formed so that the pin 12 can be attached to the screw hole 15.
7 are provided respectively. Further, the spring portion 8a is formed wide to prevent buckling, and a pair of ribs 22 are fixedly provided as a reinforcing portion. The width of the gap 8e between the spring portion 8a and the end portion 8b is formed to be narrow so that elasticity can be easily obtained.

As shown in FIG. 3, in the above-mentioned elastic member 8, when the carriage 5 moves, the engaging portion 9 receives a reaction force from the lead screw portion 7b in the direction of the arrow. Since this elastic member 8 is formed very thin, when it receives a reaction force as shown in the figure, buckling occurs and the head feeding accuracy deteriorates. Therefore, by providing the rib 22 on the spring portion 8a of the elastic member 8 and making the width of the spring portion 8a wide, the rigidity of the portion other than the elastically deformed portion can be increased and buckling can be prevented. In this embodiment, the thickness of the elastic member 8 is approximately 0.1 mm, and the thickness of the rib 22 is approximately 0.2 mm.
It was set as m.

The elastic member 8 thus formed is fixed using a screw 18 after the hole 16 is engaged with the pin 12 and the hole 17 is aligned with the screw hole 15. Here, the reason why the elastic member 8 is screwed and fixed to the carriage 5 from above is to facilitate assembly and to avoid applying unnecessary force to the bearing 13. If the elastic member 8 is
If you tighten the screws from the
You have to operate it from the side, which makes it extremely difficult to operate. Furthermore, since the screw is located near the bearing 13, the distortion of the carriage 5 when the screw is tightened deforms the bearing 13, causing deterioration of the roundness of the bearing 13. Furthermore, if the elastic member 8 were not supported by the pin 12, the elastic member 8 would be deformed as shown in FIG. 4 due to the friction caused by the rotation of the lead screw portion 7b and the influence of the lead angle. Since the pin 12 is provided, such deformation does not occur.

FIG. 5 shows the engaging part 9 and lead screw part 7.
This shows the state of engagement with b. As shown in this figure, the engaging portion 9 and the lead screw portion 7b are elastically engaged, and the force F acting between the engaging portion 9 and the lead screw portion 7b is equal to this force. Since the point of action is approximately the midpoint between the two bearings 13, the force is distributed by 1/2F between both bearings 13 and the guide portion 7a, and no moment or the like to rotate the carriage 5 acts. Furthermore, the bearing 13 does not come into contact with the guide portion 7a unevenly, and the carriage 5 can come into contact with the guide portion 7a in a substantially ideal state. Further, in this configuration, the rigidity in the X and Y directions in the figure is strong, but the rigidity in the Z direction is weak. Therefore,
Movement of the carriage 5 in the Z direction causes a displacement of the head 4 in the height direction, but the head 4 is located between the bearing 13 and the guide shaft 11, and the movement in the Z direction is restricted by the guide shaft 11. Therefore, the fitting gap between the bearing 13 and the guide portion 7a is never larger than the fitting gap (10 μm in this embodiment). Therefore, head touch is not affected.

On the other hand, the second guide portion 5b of the carriage 5
An elastic regulating member 10 is fixed to the carriage 5 so as to sandwich a guide shaft 11 therebetween. The guide shaft 11 is fixed to the main body of the disk drive device (not shown) in a position parallel to the rotating shaft 7, which is also a guide shaft, in terms of height. With the above configuration, rotational movement of the carriage 5 around the guide portion 7a is regulated. In this embodiment, the influence of this regulating member 10 on the elastic member described above is as follows:
The force F of the elastic member 8 is approximately 20 to 100 gf, which can be ignored.

The operation of this embodiment with the above configuration will be described. In the state shown in FIG. 1, when the step motor 6 is driven and rotated by a predetermined rotation angle, the lead screw portion 7b also rotates by the same rotation angle. At this time, the carriage 5 carrying the head 4 is moved by a predetermined amount in the Y direction along the guide portion 7a and the guide shaft 11 by the engaging portion 9 engaged with the lead screw portion 7b. Even if there is external vibration during this operation or a change in the force direction during reciprocating operation, the carriage 5 is moved to one side of the guide portion 7a as shown in FIG. 3 due to the operation of the elastic member 8, as described above. state,
There is no deterioration in head feeding accuracy, no increase in hysteresis, no change in azimuth angle, etc., and a stable head feeding device can be realized at all times.

[0019]

As is clear from the above description, in the present invention, the engaging portion is formed approximately in the center of the elastic member, and the reinforcing portions are formed in the elastic member approximately symmetrically across the engaging portion. Therefore, the elastic member elastically deforms symmetrically around the engaging portion. Therefore, since the carriage contacts the guide shaft evenly, stable head feeding can be achieved.

Furthermore, since the elastic member is fixed in a direction perpendicular to the recording surface of the recording medium, attachment of the elastic member is very easy.

Furthermore, one bent portion provided on the elastic member is locked to a protrusion provided on the guide portion of the carriage,
Since the other bent portion is fixed near the guide portion, the elastic member will not be deformed due to friction due to rotation of the lead screw or the influence of the lead angle.

[Brief explanation of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, and is a plan view.

FIG. 2 is a diagram showing one embodiment of the present invention, and is an exploded perspective view.

FIG. 3 is a diagram illustrating the operation of the embodiment.

FIG. 4 is a diagram illustrating the operation of the embodiment.

FIG. 5 is a diagram illustrating the operation of the embodiment.

[Explanation of symbols]

4 Head 5 Carriage 5a First guide part 7 Rotation axis 7a Guide part 7b Lead screw part 8 Elastic member 9 Engagement part 12 pin 22 Rib

Claims (3)

[Claims] 1. A carriage comprising: a head for recording on or reproducing information from a recording medium; a rotating lead screw; and a carriage to which the head is fixedly attached and an engaging portion for engaging the lead screw is formed through an elastic member. A head feeding device having the following: the engaging portion is formed approximately at the center of the elastic member, and the elastic member has reinforcing portions formed approximately symmetrically across the engaging portion. A head feeding device characterized by: 2. The head feeding device according to claim 1, wherein the elastic member is fixed in a direction perpendicular to the recording surface of the recording medium. 3. The carriage has a guide portion to which the bearing is fixed, the guide portion has a protrusion in a direction perpendicular to the recording surface of the recording medium, and the guide portion has a protrusion that extends between the two ends of the elastic member. has two bent portions formed in opposite directions, one bent portion being locked to the protruding portion, and the other bent portion being fixed near the guide portion. Item 2. The head feeding device according to item 2.