JPH07182803A - Head driving device - Google Patents

Abstract

PURPOSE:To reduce the size, weight and thickness of a disk device and to save its energy by providing a lead screw with a carriage driving function and a carriage guiding function in combination. CONSTITUTION:An engaging pin of a carriage 54 mounted with a head 17b is brought into elastic contact with a lead groove 53a of a lead screw 53 of a head driving shaft and the carriage 54 moves back and forth according to turning of this screw 53. Plain bearings 100 on both sides of this engaging pin are fitted to the outer peripheral part of the screw 53. The lead screw is provided with both of the carriage driving function and guiding function by this constitution and the need for guide bars, etc., is eliminated. Consequently, the size, weight and thickness of the disk are reduced and the energy of the device is saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drive device, and more particularly to a head drive device for seeking a recording / reproducing head in a disc device for recording or reproducing information on a disc.

[0002]

2. Description of the Related Art A disk device is a device for recording or reproducing information on or from a disk-shaped recording medium such as a magnetic disk or a laser disk. The disk is rotated by the drive of, and recording or reproduction is performed while moving the head in contact with or approaching the disk. In this case, the head is mounted on the carriage and moved (seek) along the radial direction of the disk by the motor.

Such a disk device is used as an external storage device of an electronic device such as a personal computer or a word processor and may be configured as an independent device. However, in general, the disk device is incorporated in the main body of the electronic device. Many. Further, with the downsizing and portability of electronic devices, there is also a strong demand for downsizing, weight reduction, thinning, and energy saving of disk devices.

Therefore, even in the seek mechanism in such a disk device, there is a strong demand for miniaturization and low power of the drive motor, and for that purpose, a seek mechanism with less drive loss is required.

[0005]

FIG. 9 is a schematic perspective view showing a head drive device in the above-mentioned conventional disk device. In FIG. 9, a carriage 2 on which a head (not shown) is mounted has a guide bar (not shown) arranged on a base (not shown) and a radius on a recording medium (not shown) via a sliding bearing. It is movably supported in a direction (a direction along a guide bar or a lead screw described later). Further, an engagement pin 4 is integrally fixed to the carriage 2 and engages with a lead groove 5a of a lead screw 5 arranged in parallel with the guide bar. Further, a leaf spring provided on the carriage 2 is provided. When the lead screw 6 is pressed by the lead screw 6, the engagement pin 4 of the carriage 2 is securely engaged with the lead groove 5 a of the lead screw 5.

In such a head drive mechanism, it is important how much the play between the guide bar and the sliding bearing fits. That is, if the fitting backlash is too small, the frictional load between the guide bar and the sliding bearing increases, and the torque of the motor becomes insufficient. This causes a problem that the sliding friction load between the guide bar and the sliding bearing increases and the torque of the motor becomes insufficient.

[0007]

In order to solve the above-mentioned problems, the present invention provides a head for recording or reproducing information on a rotating disk-shaped recording medium, and a head which holds the head and moves in the radial direction of the recording medium. In a head drive device comprising a possible carriage and a lead screw for driving the carriage, the lead screw has both a function of driving the carriage and a function of guiding the carriage.

[0008]

EXAMPLES Next, examples of the present invention will be described. In each of the following drawings, the same reference numerals denote the same parts or corresponding parts. FIG. 1 is a plan view showing one embodiment of a head driving device of the present invention, FIG. 2 is a side view of the head driving device, and FIG. 3 is a sectional view taken along line 3-3 of FIG. FIG. 4 is a plan view showing another embodiment of the head drive device of the present invention, FIG. 5 is a side view of the head drive device, and FIG. 6 is a line 6- of FIG. 6 is a cross-sectional view taken along line 6, FIG. 7 is a plan view showing still another embodiment of the head driving device of the present invention, and FIG. 8 is a line 8-- in FIG.
8 is a sectional view taken along line 8, and FIG. 9 is a plan view showing almost the entire head drive device of the present invention.

In FIG. 9, each component is housed in a box-shaped base 10 having an open top. The base 10 is formed of a thin metal structure such as aluminum, and the upper surface thereof is a cover (not shown) formed of a non-magnetic thin plate material such as aluminum for magnetic shielding and dust prevention. Is covered with. A front panel 13 having a cassette insertion opening (not shown) for inserting and ejecting the disc cassette 11 is attached to the front surface of the base 10. Also, this front panel 1
A push button (eject button) 14 that is operated when ejecting the loaded disk cassette 11 is provided at the left end portion of 3.

Further, in the base 10, a cassette guide 15 for guiding insertion, ejection and loading / unloading of the disc cassette 11 is held so as to be movable up and down and back and forth. The cassette guide 15 has a cross-sectional shape that guides and holds the disc cassette 11 that is inserted from the front, and in the example shown in the drawing, the notch 16 is formed by removing the substantially left half of the rear portion (back portion). It has a planar shape provided. Further, the cassette guide 15 is attached to the right side of the base 10 (position shifted to the right side), and a space for arranging other components is formed on the left side of the base 10. There is.

In the area of the notch 16 of the cassette guide 15, a head seek mechanism 18 having a head 17 for recording or reproducing information on the disc in the disc cassette 11 is arranged. The head seek mechanism 18 is a mechanism for moving (seeking) the head 17 to an arbitrary track position along the radial direction of the disk. In the illustrated example, the notch 16 is provided on the left side of the rear half of the cassette guide 15 in the region of about 1/4, but in some cases, a notch corresponding to this may be provided on the right side of the latter half. In that case, a mechanism corresponding to the head seek mechanism 18 is also provided in the cutout region on the right side.

Near the side edge in the space (left side in the illustrated example) formed by moving the cassette guide to one side (the right side in the illustrated example), the disk cassette 11 extends along the side edge of the disk cassette 11. A cassette loading mechanism 3 including a button lever 36 and the like arranged in the insertion direction.
3 and the head seek mechanism 18 are arranged.

Further, reference numeral 51 indicates a base 1
0 is a motor for driving a head fixed to the rear wall, and a drive shaft 53 composed of a lead screw rotated via a gear train is connected to the motor 51.

1 to 3, a lead groove 53a is formed in the drive shaft (lead screw) 53 described above. Engaging pin 54 that engages with the lead groove 53a
A carriage 54 having a and capable of reciprocating by the forward and reverse rotation of the drive shaft 53 is arranged. The engagement pin 54
“A” has a spring property, that is, is elastically deformable. The sliding bearing 100 is provided on the carriage 54 with the engagement pin 54.
The sliding bearing 100 is provided on both sides of a at a distance, and is fitted to the drive shaft 53. Reference numeral 101 is a bar that supports the carriage 54 so as not to move downward as viewed in FIG. 2, that is, to maintain the position of the head 17B (lower head), which is normally fixed to the base 10. ing. The carriage 54 also includes the carriage 5.
2 is integrally provided with an elastic engaging piece 54b that presses against the bar 101 so as not to float upward when viewed in FIG.

Referring again to FIG. 9, the carriage 54
Is a head arm 57 attached so as to be vertically movable via a leaf spring 56, an upper head 17A attached to a tip end portion of the head arm 57, and the head arm 57 downward (toward the head load position). ) A head load spring 58 for urging is provided.

Further, a bar 61 for head lift (for unloading the head) extending through the lower side of the head arm 57 is provided on the side of the notch 16 of the cassette guide 15, and a holder at the rear end of the bar 61. 59 is attached, and its front end is fixed to the cassette guide 15. The bar 61 is configured so that the bottom portion (not shown) of the holder 59 engages with the base 10 when the head is unloaded.

Referring now to FIGS. 4-6, FIGS.
An embodiment different from the embodiment shown in FIG. In this embodiment, the bar 101 in the previous embodiment
Another configuration is adopted instead of the combination of the engaging piece 54b and the engaging piece 54b. 4 to 6, a contact portion 102 is formed by cutting and raising a part of the base 10, and an engaging piece 54d having a spring property is formed on the carriage 54. The piece 54d has a plate-shaped portion extending substantially parallel to the carriage body and a protrusion having a substantially flat upper surface formed on the top end of the plate-shaped portion, and this protrusion is the same as the upper end portion of the contact portion 102. It is designed to engage.

Next, FIGS. 7 and 8 show still another embodiment. In the embodiments of these figures, the positioning pin 110 provided on the base 10 is utilized.
The positioning pin 110 is provided in the vicinity of the lead screw 53 and defines the position when the disc cassette 11 is loaded. Grooves are provided on both sides of the positioning pin 110, an escape hole is provided in the carriage 54 in the groove, and a thin portion 54c having a spring property provided on the escape hole side.
Are engaged.

[0019]

As described above, according to the present invention, the lead screw has the function of guiding the carriage in addition to the function of driving the carriage.
The influence of the sliding friction load between the lead screw and the sliding bearing due to the looseness between the lead screw and the sliding bearing can be reduced. Therefore, the torque of the motor can be reduced, which contributes to downsizing of the device. In addition, bar 10
1 does not have the function of guiding the carriage, so
Unlike the conventional guide bar, it is not necessary to severely control the parallelism with the lead screw shaft, which is advantageous in cost.

[Brief description of drawings]

FIG. 1 is a plan view showing one embodiment of a head driving device of the present invention.

FIG. 2 is a side view of a head drive device.

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG.

FIG. 4 is a plan view showing another embodiment of the head driving device of the present invention.

FIG. 5 is a side view of a head drive device.

6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a plan view showing still another embodiment of the head driving device of the present invention.

FIG. 8 is a cross-sectional view taken along line 8-8 of FIG.

FIG. 9 is a plan view showing almost the entire head driving device of the present invention.

FIG. 10 is a schematic perspective view showing a conventional head driving device.

[Explanation of symbols]

 53 head drive shaft (lead screw) 53a lead groove 54 carriage 54a engaging pin 101 bar 54b engaging piece

Claims (8)

[Claims] 1. A head drive comprising a head for recording or reproducing information on a rotating disc-shaped recording medium, a carriage for holding the head and movable in a radial direction of the recording medium, and a lead screw for driving the carriage. In the apparatus, the head driving device is characterized in that the lead screw has both a function of driving the carriage and a function of guiding the carriage. 2. A head for recording or reproducing information on a rotating disc-shaped recording medium, a carriage for holding the head and movable in the radial direction of the recording medium, and a movement for moving the carriage with respect to a lead screw. A head driving device comprising: a means and a guiding means provided to the lead screw so as to guide the carriage along the lead screw when the moving means moves the carriage. 3. The head drive device according to claim 2, wherein the moving means has a lead groove provided in a lead screw and an engagement pin provided in a carriage and engaged with the lead groove, The head driving device, wherein the pin is configured to have a spring property so as to compensate the displacement of the lead groove. 4. The head drive device according to claim 2, wherein the guide means is a sliding bearing provided on the carriage so as to be fitted to lead screw portions on both sides of the moving means. Head drive device. 5. The head drive device according to claim 2, further comprising a support means for supporting the carriage and restricting vertical movement of the carriage when the carriage is moved along the lead screw. apparatus. 6. The head drive device according to claim 5, wherein the supporting means includes a bar formed on the base and an engagement piece having a spring property formed on the carriage so as to engage with the bar. A head drive device characterized by the above. 7. The head drive device according to claim 5, wherein the support means has a contact portion formed on the base and having a spring property, and an engagement piece formed on the carriage so as to engage with the corresponding contact portion. A head drive device comprising: 8. The head drive device according to claim 5, wherein the support means is provided on the base and has a groove formed with a positioning pin, and a spring property formed on the carriage so as to engage with the groove of the positioning pin. And a thin-walled portion having a head.