JPS6246471A - Carriage assembling body - Google Patents

Abstract

PURPOSE:To reduce the vertical size of an assembling body to reduce the size and weight and to save driving power by arranging guide rails between a carriage and the center magnetic poles of right and left magnetic circuits. CONSTITUTION:The carriage 1 mounting a pickup is guided along the guide rails 9 through a bearing 8. The guide rails 9 are arranged between the carriage 1 and the center magnetic poles 5 of the right and left magnetic circuits and the part of the center magnetic pole 5 which is opposed to rail 9 is formed like a recessed shape. Consequently, the vertical size of a coil bobbin 6 is reduced and the size of the carriage 1 fixed to the bobbin 6 can be also reduced. Thereby, the carriage assembling body and the driving coil 7 can be reduced at the size and weight and the driving power can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a carriage assembly in a disk recording device that is equipped with a mechanism for positioning an information converter at a predetermined target position by linearly reciprocating the carriage. It is related to.

[Conventional technology].

FIG. 4 is a perspective view of a conventional carriage assembly.

In Fig. 4, 11 is a carriage.

For example, it is equipped with Pink Up 12. Reference numeral 13 denotes an outer box yoke of a magnetic circuit constituting the drive side drive source.

A permanent magnet 14 is fixed to the outer case yoke 13, for example. 15 is a central magnetic pole, and these outer box yokes 13. Permanent magnet 14. Each part of the central magnetic pole 15 constitutes a fixed drive source for driving the carriage 11, and these fixed drive sources are provided on both sides of the carriage 11. Reference numeral 16 denotes a fill bobbin on the movable side, and a drive coil 1T is wound around this coil bobbin 16, and the coil bobbin 16 is fixed to the carriage 11. These carriages 11. Pickup 12. Possible 1IJJ including movable side drive source with coil povi/16° and drive coil 17
It makes up the department. 18 is a bearing that supports the movable part t; 19 is a guide knoll that is in contact with the bearing 18 and guides the linear reciprocating motion of the movable part.

Next, the operation will be explained. A magnetic circuit is constituted by an outer box yoke 13 with pressure on both sides, a permanent magnet 14, and a center magnetic pole 15, and the direction of the magnetic field runs in the Y direction and the -Y direction shown in FIG. The drive coil 17 passes through a magnetic field formed by a magnetic circuit, and current passes in two directions with respect to the Y direction of the magnetic field and in twelve directions with respect to the -Y direction of the magnetic field, as shown in FIG. Therefore, the driving force acts in the X direction in FIG. When the target position of the disk is determined, a current flows through the driving coil 17 according to an instruction from the control section, and the carriage 11 is controlled and moved by the driving force so as to reach the target position tK.

Next, the supporting method will be explained. FIG. 3 shows a cross-sectional view of a conventional carriage assembly taken in the Y direction. Third
In the figure, a plurality of bearings 1B provided on both sides of the upper part of the carriage 11 are respectively provided between the upper part of the center magnetic pole 15 and the coil pobbin 16.
9, the Y direction and 2 in FIG.
Constrain the direction and rotation about the x, y, and z axes. Therefore, the movable part can perform smooth linear reciprocating motion only in the front-rear direction (X direction).

Note that a is the height of the outer box yoke 13, and b is the height of the carriage 11.
, C is the inner surface distance of the center magnetic pole 15, d is the width of the center magnetic pole 15, e is the width of the permanent magnet 14, f is the width of the outer case yoke 13, and g1 is the distance between the bottom surface position of the carriage 11 and the outer case yoke. 13 -gz is the difference between the upper surface position of the outer box yoke 13 and the upper surface position of the carrier 5° joint 11, h is the width of the coil hinge 16,
H6 is the height of the coil pobbin 16.

[Problem that the invention seeks to solve]

Since the conventional carriage assembly is configured as described above, the vertical dimensions of the coil pobbin 16 surrounding the center magnetic pole 15, the guide knob 19 and the bearing 181 arranged above the center magnetic pole 15 are large, and the coil pobbin 16 and Since the vertical dimensions of the fixed carriage 11 also increase, the mass of the movable part increases. Therefore, it is necessary to increase the driving force, and the permanent magnet 14. It is necessary to increase the size of the outer box yoke 13° and the center magnetic pole 15, or to increase the electric current m flowing through the drive coil 17. Also, since the vertical dimensions of the carriage assembly and the fill pobin 16 become larger, There were problems such as the need for storage space.

This invention was developed to solve the above-mentioned problems by reducing the weight of the movable parts, thereby reducing the driving force and reducing power consumption.

The object of the present invention is to obtain a carriage assembly whose entire size can be reduced.

[Means for solving problems]

In the carriage assembly according to the present invention, a guide knob for guiding the carriage is installed between the carriage and the central magnetic poles of the left and right magnetic circuits.
- Since the cable was installed between the carriage and the middle C magnetic pole,
The carriage and drive coil are smaller and lighter, allowing the carriage to perform linear reciprocating motion with less driving force.

〔Example〕

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a carriage on which a pickup 2, for example, is mounted. Reference numeral 3 denotes an outer case yoke of a magnetic circuit constituting a fixed side drive source, and 4 a permanent magnet, which is fixed to the outer case yoke 3, for example.

Reference numeral 5 denotes a central magnetic pole, which is integrated with the outer box yoke 3 and forms a magnetosphere 18. Reference numeral 6 denotes a coil pobbin as a movable part, which is integrally formed on the left and right sides, and the driving coil T is wound around this coil pobbin 6.

The coil pobbins 6 around which the driving coils 7 are wound are attached so as to interlink with the magnetic circuits on both sides and surround the carriage 1. Pickup 2. The movable part is formed by the coil T for driving the coil pobbin 6°. Reference numeral 8 denotes bearings (or rollers) that support the movable parts, and three bearings (or rollers) are arranged on both sides of the carriage 10, one above the other.
,.

Each touches the force id V-le 9 at the required angle,
It is supported by the carriage 11, and is regulated in the up, down, left and right directions, allowing only linear reciprocating movement.

Next K, carriage 1. Center magnetic pole5. The relationship between the coil bobbin 6 and the guide knoll S will be explained.

FIG. 2 shows a cross-sectional view of the embodiment of the invention shown in FIG. In FIG. 2, the guide knoll 9 is installed between the carriage 1 and the center magnetic pole 5, and in order to ensure the necessary cross-sectional area of the center magnetic pole 5 and to make the width dimension of the coil pobbin 6 as small as possible, the guide knoll 9 The bearing 80 portion is made concave. In addition, the vertical dimensions of carriage 1 are
It becomes possible to reduce the gap between the center magnetic pole 5 and the coil pobbin 6 to the minimum required. Also, the dimension C between both central magnetic poles 5
represents the minimum dimension necessary for the uneven portion of the carriage 1 to be able to reciprocate directly between the center magnetic poles 5. and,&*
b+ e+ 6* f+ gI a h is the same as in FIG. 3, d is the width of the central magnetic pole 5, and Hl is the height of the coil pobbin 6.

Next, the shape of the coil pobbin 6 will be explained.

As shown in FIG. 3, the vertical dimension H7 of the conventional coil pobbin 16 is 1(,=a-1-2h+g1+gt), and the vertical dimension H of the coil pobbin 6 in the case of the present invention is Hl= a+2 (h+g, ), which is smaller than H2 by gz-gI.

g is a dimension where the coil pobbin 6 does not come into contact with the center magnetic pole 5, about 0.5 m is sufficient, and is clearly smaller than gtK.

In addition, the width dimension is 2 (2) compared to the conventional one.
d, -d, ), but the height a9 of the central magnetic pole 5
Assuming that it is the same as the conventional one, the value of 2(d, -d2) is less than a small value, and the width of the coil bobbin 60 is only slightly increased compared to the conventional one.

Next, the operation will be explained. An outer box yoke 3, a permanent magnet 4, and a center magnetic pole 5 on both sides of the carriage 1 constitute a magnetic circuit, and the direction of the magnetic field runs in the Y direction and the -Y direction shown in FIG. The drive coil 7 passes in one or two directions with respect to the -Y direction of the magnetic field formed by the magnetic circuit.

Therefore, the driving force acts in the X direction in FIG. 5, and when the target position of the disk is determined, current flows through the driving coil 7 according to instructions from the control section, and the carriage 1 is caused to reach the target position by the driving force. Move in a controlled manner.

The driving force F2 is calculated as follows, where Ic is the current flowing through the coil, KF is the force constant of the linear motor, and V is the maximum moving speed of the carriage 1.
fil, and the force constant KF is the current flowing through the coil vrc, the carriage mass vkm, the time constant tτ2, the average travel time Tav, and the travel distance -41
, then.

m τ.

x y = I, (T,, > ” L...-
...Town...Scream...+21 and 1mTgKr l
T, l T@v l Ly If the conditions are the same, the fill will flow■. is proportional to the carriage mass m. Therefore, if the carriage mass m becomes smaller, the coil current I. and the driving force F5 for moving the carriage 1
can be made smaller.

Also, the power consumption P is the coil current. , the coil resistance is R
If it is o.

P=Ie”Rc...old...group...
・・・Old・・・・・・+31, so the coil current IC
′ becomes smaller in proportion to Therefore, the weight of the carriage 1 can be reduced by increasing the power consumption P in proportion to the square of the carriage mass m.
can be reduced.

〔Effect of the invention〕

As described above, in this invention, since the guide rail is installed between the carriage and the center magnetic pole, the carriage assembly can be made smaller and lighter. Therefore, it is possible to save space for the entire apparatus and to save power for the linear reciprocating movement of the carriage assembly.

[Brief explanation of the drawing]

Figure 1 shows a carriage assembly according to an embodiment of the present invention!
FIG. 2 is a sectional view of the M1 diagram, FIG. 3 is a sectional view of a conventional carriage assembly, FIG. 4 is a perspective view of the carriage assembly of FIG. 3, and FIG. 5 explains the direction of the magnetic field. This is a diagram for In the figure, 1 is a carriage, 2 is a pickup, 3 is an outer box yoke, 4 is a permanent magnet, 5 is a central magnetic pole, 6 is a coil bobbin, 7 is a driving coil, 8 is a bearing, and 9 is a guide rail. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a carriage assembly that positions a carriage to a predetermined target position by linearly reciprocating movement, magnetic circuits are provided on both sides of the carriage, and are formed to interlink with both magnetic circuits and surround the carriage. A left and right integrated drive coil is provided on the carriage, and a guide rail for linearly reciprocating the carriage and the drive coil is provided between the carriage and the center magnetic poles of both magnetic circuits. Characteristic carriage assembly. (2) The carriage assembly according to claim (1), wherein the central magnetic poles of the left and right magnetic circuits have concave portions facing the guide rail.