JPS63253575A - Head moving device - Google Patents

Abstract

PURPOSE:To realize stable head movement without hysteresis, by causing a guide means which supports and guides a head carrying carriage to make displacement movement relatively to the carriage. CONSTITUTION:The carriage 1 mounted with a magnetic head 2 is supported by guide bars 3 installed to a holding member 4 in a rotatable state in a slidable state and moves along the bars 3. When an AC voltage is applied across a piezo-electric element 11 fixed to the member 4, the element 11 oscillates upward and downward and the oscillation is transmitted to the bars 3 through pins 12 and clanks 14 and the bars 3 repeat alternate rotation of rightward and leftward. By the relative movement of the bars 3 due to the minute vibrations against the carriage 1, the carriage 1 receives no influences of static friction but those of dynamic friction from the bars 3 and can stably move the head 2 without hysteresis.

Description

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The present invention relates to a head moving device for moving a recording or rrf recording head.

(Prior Art) FIG. 5 is a perspective view of a magnetic disk drive device including a head moving device as a conventional example.

In the figure, l indicates a carriage, and this carriage l
A magnetic head 2 is supported at the H end. 3 is a guide bar, and both ends of this guide bar 3 are held by guide bar holding members 4. Reference numeral 5 designates sliding bearings, which are provided at three locations on the carriage 1 and come into contact with the shafts of the two guide bars 3, so that the carriage 1 is attached to be slidable in the axial direction of the guide bars 3. 6 indicates the arm, magnetic ＼
A magnetic head (not shown) is mounted at a position of the Arno 6 facing the RAD 2, and is provided so as to sandwich the magnetic disk 7 therebetween. Reference numeral 8 indicates a steel belt, and reference numeral 67 indicates a magnetic disk case, which is provided to transmit the rotational force of the stepping motor 9 to the carriage l via the steel belt 8 and a pulley 10 attached to the shaft of the stepping motor 9. A flexible magnetic disk made of a disk-shaped IIT flexible body is housed therein.

The operation of the above configuration will now be described.

The carriage 1 is held on the shaft of a guide bar 3 via a sliding bearing 5 so as to be slidable. As the stepping motor 9 operates, its rotational force is transmitted to the carriage 1 via the pulley 10 and the steel belt 8. The carriage 1 starts sliding in the axial direction of the guide bar 3 against static friction by the driving force transmitted from the stepping motor 9.

[Problem that the invention seeks to solve]

However, in the head moving device used in the conventional magnetic disk drive device as described above, the guide bar 3
The static friction at the contact portion of the slide bearing 5 is large, and when the carriage 1 moves, hysteresis occurs with respect to the driving force of the stepping motor 9, making it impossible to perform highly accurate tracking. In other words, the recording field 1j1 is large (in a magnetic disk drive of IOMB or higher, the track density is large and the track width is several tens of μm, and in order to perform stable recording and reproduction, the servo mechanism has to is several μm
N-close tracking is required. However, there is a problem in that the static friction between the guide bar 3 and the slide 1 oil pan 5 is large, and large hysteresis occurs in the displacement of the sliding carriage 1, making it difficult to perform highly accurate tracking.

The present invention has been made to solve such problems, and an object of the present invention is to provide a head moving device that can stably move the head without causing bisteresis in the displacement of the carriage. .

[Means for solving problems]

A head moving device according to the present invention includes a carriage for transporting a recording or reproducing head, a guide means for slidably supporting the carriage, and a movement means for displacing the guide means relative to the carriage. It is equipped with the following.

[Effect]

In the configuration described above, by displacing the guide means by the movement means, the carriage and +T
If the guide force 41 reduces the friction, the occurrence of hysteresis in the displacement of the carriage is suppressed.

(Example) FIG. 1 is a perspective view showing a first embodiment of the present invention.

In the figure, reference numerals 1 to 10 indicate structures corresponding to or the same as those of the conventional example, and detailed description thereof will be omitted.

The guide bar 3 is rotatably held by guide bar holding members 4 at both ends thereof. Reference numeral 11 indicates a piezoelectric element as a moving means, and this piezoelectric element 11 is provided so as to give vibration to the pin 12, and is held by a piezoelectric element holding member 13. 14 is a crank connected to the guide bar 3;
A pin 12 is attached to the end of this crank 14.

15 is a leaf spring. The pin 12 is attached to the guide bar holding member 4 by being biased upward in order to abut the piezoelectric element 11 .

In the above configuration, the operation will be explained next.

When an alternating current voltage is applied to the piezoelectric element 11, the piezoelectric element 11 vibrates in the vertical direction, and the vibration is caused by the pin 12 and the crank 14.
is transmitted to the guide bar 3 via. That is, the vibration of the piezoelectric element 11 is transmitted to the guide bar 3 as minute vibrations that alternately rotate in the rightward and leftward directions about the axis of the guide bar 3 . When the guide bar 3 vibrates minutely, a slight vibration is applied to the contact area between the shaft of the guide bar 3 and the sliding bearing 5, which causes friction between the guide bar 3 and the sliding bearing 5.
The state of friction shifts from static friction to dynamic friction. Since the carriage 1 is held on the axis of the guide bar 3 in a state close to the movement 1'i, it can be moved smoothly by the appropriate driving force of the stepping motor 9, and the occurrence of hysteresis is suppressed. be done. If the above-mentioned minute vibrations are not applied to the guide bar 3, the carriage l will be held on the axis of the guide bar 3 in a static IF state. Also big stationary ff
Excessive driving force against fi will cause a change of heart. That is, unless minute vibrations are applied to the guide bar 3, the carriage 1 will not move the axis 2 of the guide bar 3 with an appropriate displacement and hysteresis will occur.

As mentioned above, by applying minute vibrations to the guide bar 3, the carriage 1 is held on the axis of the guide bar 3 in a state close to dynamic friction, so it can slide smoothly in the axial direction of the guide bar 3. , since the occurrence of hysteresis is suppressed,
Precise control can be performed using a servo mechanism.

Note that the vibrations that occur in the guide bar 3 have a negative effect on the magnetic disk drive! It is desirable that the vibration be so small that it does not cause any damage, and it is necessary to use an appropriate value for the vibration frequency. It is appropriate to select the frequency (approximately 100 H2 or less) or the recording signal frequency (approximately 100 H2 or less).

In addition, make the guide bar 3 vibrate as described above! If it is possible to do so, it is possible to omit the use of the pressure '1' nitrogen 7-11 and to use other moving stages, and the sliding movement of the carriage 1 can be facilitated.

Next, a second embodiment of the present invention will be described based on the perspective view shown in FIG.

Reference characters ``+1'' to ``+10'' indicate structures corresponding to or the same as those of the conventional example, and detailed explanation thereof will be omitted.

Both ends of the guide bar 3 are rotatably held by a guide bar holding member 4, as in the first embodiment.

16 is a worm wheel gear, which is attached to one end of the guide bar 3. 17 indicates a worm gear, which is connected to the worm gear shaft 18 and is connected to the worm wheel gear 1.
6 and 1vI, and is provided so as to transmit rotational motion to the guide bar 3. A worm gear shift holding member 19 is fixed to the guide bar holding member 4 and holds the worm gear shaft 18.

Reference numeral 20 indicates an electric motor as a motor stage, and is provided to transmit rotational force to the worm gear 17 attached to the worm gear shaft 18.

” In the ETO configuration, the operation will be explained next.

The rotational force of the electric motor 20 is transmitted to the guide bar 3 via the worm gear shaft 18, the worm gear 17, and the worm wheel gear 16. As the guide bar 3 rotates about its axis, the contact portion between the guide bar 3 and the sliding bearing 5 changes from static friction to dynamic friction.

Therefore, as in the first embodiment, the carriage 1 can be appropriately displaced on the axis of the guide bar 3.
It moves smoothly and the occurrence of hysteresis is suppressed.

Note that the rotational force of a motor (not shown) that rotates the magnetic disk may be transmitted to the ohm gear shaft 18 via a head or the like, and the guide bar 3 may be rotated in the same manner as described above. The occurrence of hysteresis can be suppressed.

Next, a third practical example h6 of the present invention will be explained.

FIG. 3 is a perspective view showing the third embodiment, and FIG. 4 is a partially enlarged sectional view of FIG. 3. Reference numerals 1 to 10 indicate structures corresponding to or the same as those of the conventional example, and detailed explanation thereof will be omitted.

The guide bar 3 has guide bar holding members 4 at both ends thereof.
The guide bar 3 is held slidably in the axial direction of the guide bar 3.

Reference numeral 21 denotes an elastic body that holds the JT end of the guide bar 3. 22 is an elastic body holding member that holds the elastic body 21 by one length. Reference numeral 23 designates a piezoelectric element as a moving stage, and the piezoelectric element 23 is provided so as to hold each left end of the guide bar 3 and give vibration to the guide bar 3 in its axial direction. 24 is a piezoelectric element holding member that holds the piezoelectric element 23.

In the above configuration, the operation will be explained next. When an AC voltage is applied to the piezoelectric element 23, the piezoelectric element 23 vibrates, and as shown in FIG. 4, the guide bar 3 in contact with the piezoelectric element 23 is vibrated in its axial direction. Due to the minute vibrations in the axial direction, the contact area between the guide bar 3 and the sliding bearing 5 shifts to a state of dynamic friction, and the carriage 1 always slides smoothly in the axial direction of the guide bar 3 with an appropriate driving force, and the hysteresis The occurrence of is suppressed.

Although each embodiment has been explained using a head moving device in a flexible magnetic disk device as an example, the same effect is obtained not only when used in a head moving device such as a video disk device or a printer. It is something that can be done.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a head moving device that can suppress the occurrence of hysteresis in the displacement of a carriage and can perform stable head movement.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the invention, FIG. 2 is a perspective view showing a second embodiment of the invention, and FIG. 3 is a perspective view showing a third embodiment of the invention.
FIG. 4 is a partially enlarged sectional view of FIG. 3, and FIG. 5 is a perspective view of a conventional example. 1 Carriage 2 Magnetic head 3 Guide bar 5 Sliding bearing 9 Stepping motor 11・Piezoelectric element 12...Bin 14...Crank 15...Plate spring 16---Worm wheel gear 17...
- Worm gear 20-----Electric motor 21...Elastic body 23...Piezoelectric element Applicant: Canon Denryo-Co., Ltd. Swash plate diagram shown in Figure 5

Claims (4)

[Claims] (1) a carriage for transporting a recording or reproducing head; a guide means for slidably supporting the carriage;
A head moving device comprising: a movement means for displacing the guide means relative to the carriage. (2) The guide means has a guide bar that engages with the carriage, and the movement means includes a piezoelectric element for rotating the guide bar about the axis of the guide bar. A head moving device according to claim 1. (3) The guide means has a guide bar that engages with the carriage, and the movement means includes an electric motor for rotating the guide bar about the axis of the guide bar. The head moving device according to item 1. (4) The guide means has a guide bar that engages with the carriage, and the movement means includes a piezoelectric element that vibrates the guide bar in the axial direction of the guide bar. The head moving device according to item 1.