JPH0785614A - Information recording/reproducing device - Google Patents

Abstract

PURPOSE:To make a magnetic plate metallic member constituting a yoke thin by not converging magnetic fluxes only on a device base constituting the yoke and on bath ends of the head moving direction of the opposing yoke but flowing them to the central part of the head moving direction and a direction perpendicular to it at a linear motor magnetic circuit. CONSTITUTION:At the linear motor for driving a recording/reproducing head 3, a magnetic field of a vertical direction is formed on at least one of opposing faces made of two magnetic plates 1 and 5 in parallel, a permanent magnet 9 is disposed in the driving direction of the head 3 so that two magnetic fields of different directions are generated and quadrilateral flat coils 6 having two pairs of opposing sides parallely fixed on the head 3 are placed within two magnetic fields having directions different from a pair of sides vertical to the driving direction of the head 3. The magnetic plates 1 and 5 are made to parts of a a sheet metal member with one ends vertical to the driving direction of the head 3 connected magnetically and the other ends used for forming a device base 1. Thus, even when the sheet metal member is made sufficiently thin, the saturation of the magnetic fluxes is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing device such as an optical disk drive device or a magnetic disk drive device, and more particularly to an information recording / reproducing device characterized by a linear motor (seek motor) for driving a recording / reproducing head. Regarding

[0002]

2. Description of the Related Art Conventionally, information recording / reproducing devices such as optical disk drive devices and magnetic disk drive devices have been known. Among them, the base of a drive motor is made of a ferromagnetic material and the base is driven. Optical information that can be used as a part of the magnetic circuit of the motor for driving to improve the strength of the base without increasing the size of the device and prevent adverse effects on recording / reproducing operation caused by resonance A recording / reproducing apparatus has been proposed (see Japanese Patent Application Laid-Open No. 2-199631).

[0003]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2-19963
In the optical information recording / reproducing apparatus described in Japanese Patent Laid-Open No. 1, the apparatus base is made of a magnetic material. Generally, when forming parts with magnetic material, there are cutting, casting / sintering, and sheet metal pressing as processing methods, and the processing cost is casting / sintering rather than cutting.
Sheet metal presses are cheaper than casting and sintering. Therefore, in order to reduce the cost of the device, it is desirable to form the device base by a sheet metal press. However, the optical information recording / reproducing device described in the above publication has the following problems. First of all, in the linear motor in the optical information recording / reproducing apparatus described in the above publication, the magnetic flux is concentrated at both ends of the yoke in the optical head moving direction, and the yoke needs to be sufficiently thick to prevent saturation of the magnetic flux. is there. On the other hand, considering the rigidity of the device base, the magnetic material has a large strength as a material,
The required thickness is much thinner than the yoke. For this reason, if the yoke and the device base are formed by a single sheet metal member, the device base becomes unnecessarily thick. In addition, it is necessary to make the yoke sufficiently thick, which means that it is difficult to make the device thin, and it is required to reduce the size and size of the device, which is required for the current information recording / reproducing device as well as the cost reduction. It is difficult to support thinning. In addition, as a second problem, it is necessary to form a support member that movably supports the optical head and a positioning portion that positions a spindle motor that rotationally drives the information recording medium with high accuracy on the apparatus base. If the sheet metal member forming the device base is thick, it is difficult to integrally form these positioning parts by press working, and when these positioning parts are attached to the device base as separate parts, ensure accuracy. Is difficult. Due to these problems, in the case of the optical information recording / reproducing device described in the above publication, it is almost impossible to form the device base by a sheet metal press, which is a great obstacle to cost reduction of the device.

The present invention has been made in view of the above circumstances, and it is possible to make the yoke of the linear motor for driving the recording / reproducing head thinner than that of the prior art, thereby making the entire device thinner and reducing the cost of the device. It is also an object of the present invention to provide an information recording / reproducing device that enables the above.

[0005]

In order to achieve the above object, the invention of claim 1 is an information recording / reproducing apparatus for recording / reproducing information, wherein a linear motor for driving a recording / reproducing head (3) comprises: A magnetic field is formed on at least one of the facing surfaces of the two parallel magnetic plates (1) and (5) in a direction perpendicular to the facing surface, and the magnetic field is different in the driving direction of the head (3). Driving direction of the head (3) of a quadrilateral flat coil (6) having two pairs of parallel sides fixed to the head (3), in which permanent magnets (2) are arranged so that two magnetic fields are formed. And the two parallel magnetic plates (1) and (5) are formed by arranging a pair of opposite sides perpendicular to each other in two magnetic fields having different directions formed between the facing surfaces. In the direction perpendicular to the driving direction of the head (3) One end is magnetically coupled to each other, and one of the two parallel magnetic plates (1) and (5) is a part of a sheet metal member forming an apparatus base (1). (FIGS. 1 and 2).

According to a second aspect of the present invention, in the information recording / reproducing apparatus of the first aspect, the two parallel magnetic plates (1) (5).
The apparatus base (1) is characterized by being formed by one sheet metal member (FIGS. 3 and 4).

According to a third aspect of the present invention, in the information recording / reproducing apparatus according to the first and second aspects, the two parallel magnetic plates (1) are provided.
In (5), permanent magnets (2) are arranged on the opposite surfaces, and the two parallel magnetic plates (1) (5) are arranged.
The opening not magnetically coupled in the direction perpendicular to the driving direction of the head (3) is extended in the perpendicular direction more than the end of the permanent magnet (2) in the same direction. It is characterized (Fig. 5).

According to a fourth aspect of the present invention, in the information recording / reproducing apparatus according to the first to third aspects, a supporting member for movably supporting the head (3) is provided on a sheet metal member forming the apparatus base (1). (8) and the positioning portions (9) and (11) of the spindle motor (10) for rotationally driving the information recording medium are integrally formed (FIG. 6).

According to a fifth aspect of the present invention, in the information recording / reproducing apparatus according to the first to third aspects, a supporting member that movably supports the head (3) is provided on a sheet metal member forming the apparatus base (1). (8) and the positioning portions (9) and (11) of the spindle motor (10) for rotationally driving the information recording medium are formed by resin outsert molding (FIG. 7).

According to a sixth aspect of the invention, in the information recording / reproducing apparatus according to the first to fifth aspects, a carriage member (7) on which the head (3) is mounted and is movably supported by the supporting member.
Is formed by resin molding, and the quadrilateral flat coil (6) is insert-molded on the carriage member (7) (FIG. 8).

According to a seventh aspect of the invention, in the information recording / reproducing apparatus according to the first to sixth aspects, the space (13) surrounded by two substantially parallel pairs of opposite sides of the quadrilateral flat coil (6) has a magnetic property. The member (14) is characterized by being insert-molded with resin (FIG. 9).

According to an eighth aspect of the present invention, in the information recording / reproducing apparatus of the seventh aspect, the supporting member (8) is connected to a sheet metal member forming the apparatus base (1) by resin molding, and The carriage member (7) is fitted to the support member (8) and has a U-shaped cross section which is opened in the fitting portion in a direction perpendicular to the two parallel magnetic plates (1) and (5). (15) is formed (FIGS. 10 and 11).

According to a ninth aspect of the invention, in the information recording / reproducing apparatus according to the eighth aspect, at least a part of the resin for insert-molding the magnetic member (14) has the U-shaped groove (1).
5) protruding from the quadrilateral flat coil (6) in the direction opposite to the opening direction (5) (FIG. 1).
2).

According to a tenth aspect of the invention, in the information recording / reproducing apparatus of the ninth aspect, the magnetic member (14) faces the magnetic member (14) in the opening direction of the U-shaped groove (15) in cross section. The gap between the magnetic plates (1) and (5) or the permanent magnet (2) is L1, and the magnetic plate (1) (which faces the magnetic member (14) in the direction opposite to the opening direction of the U-shaped groove (15) in cross section (1) ( 5) or the distance from the permanent magnet (2) to L
2. When the distance between the resin protrusion (16) and the magnetic plate (1) (5) or the permanent magnet (2) in the direction opposite to the opening direction of the U-shaped groove (15) in section is L3, L2 It is characterized in that it is arranged at a position where −L3> L1 + L3 (see FIG. 1).
3).

[0015]

In the information recording / reproducing apparatus of the present invention,
The driving linear motor of the reproducing head (3) forms a magnetic field in a direction perpendicular to the facing surface of at least one of the facing surfaces of the two parallel magnetic plates (1) and (5), and A quadrilateral flat coil having two substantially parallel opposite sides fixed to the head (3), in which a permanent magnet (2) is arranged so that two magnetic fields having different directions are formed in the driving direction of (3). The pair of opposite sides of (6) perpendicular to the driving direction of the head (3) are respectively arranged in two magnetic fields having different directions formed between the facing surfaces, and Of the parallel magnetic plates (1) and (5) at one end in the direction perpendicular to the driving direction of the head (3),
One of the two magnetic plates (1) and (5) that are magnetically coupled to each other and are parallel to each other is characterized by being a part of a sheet metal member forming the apparatus base (1). In the magnetic circuit of the linear motor described above, the magnetic flux is not concentrated only on both ends of the device base (1) and the opposing yoke (5) forming the yoke in the head moving (driving) direction, but in the central portion of the head moving direction. Since the magnetic flux also flows in the direction perpendicular to the head moving direction, the magnetic flux does not saturate even if the magnetic sheet metal member forming the yoke is made sufficiently thinner than the conventional one. Therefore, since the yoke of the linear motor can be made thinner than before, the device can be made thinner. Further, since the device base can be formed as a part of the linear motor and can be formed by one magnetic sheet metal member, the cost of the device can be reduced.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments. 1 is a perspective view of an essential part of an information recording / reproducing apparatus showing a first embodiment of the present invention, and FIG. 2 is a view showing details of a linear motor magnetic circuit in the first embodiment shown in FIG. a) is a cross-sectional view taken along the line I-I of FIG. 1, and FIG.
It is a II-II sectional view taken on the line. Further, reference numeral 1 in the drawing is a device base,
Reference numeral 2 is a permanent magnet, 3 is a recording / reproducing head, 4 is an air gap, 5 is an opposing yoke, 6 is a quadrilateral flat coil, and 7 is a carriage member. 1 and 2, the device base 1 is formed of one magnetic sheet metal member. Two flat permanent magnets 2 magnetized in a direction perpendicular to the device base 1 are fixed to the device base 1 so that different magnetic poles are adjacent to each other in the moving direction of the recording / reproducing head 3 (direction A in the figure). Has been done. In the direction opposite to the device base 1 of the permanent magnet 2, an opposed yoke 5 formed of one magnetic sheet metal member via a gap 4 is provided.
And the opposing yoke 5 is fixed and magnetically coupled to the apparatus base 1 at both ends in the head moving direction, and one end of the opposing yoke 5 in the direction perpendicular to the head moving direction is It is bent at a substantially right angle, joined to the device base 1, and magnetically coupled. In the present embodiment, by constructing the magnetic circuit as described above, two magnetic fields perpendicular to the device base 1 but in different directions are formed in the gap 4. A quadrilateral flat coil 6 having two sets of opposite sides parallel to the apparatus base 1 and substantially parallel to each other is arranged in the gap 4, and one set of the quadrilateral flat coil 6 perpendicular to the head moving direction is arranged. The opposite sides of are arranged such that they are located in magnetic fields in which the directions of the air gaps 4 are different. The quadrilateral flat coil 6 is fixed to the carriage member 7 of the recording / reproducing head 3, and the recording / reproducing head 3 is driven in the moving direction by supplying a current to the quadrilateral flat coil 6.

In the magnetic circuit of the linear motor configured as described above, the magnetic flux is not concentrated only on both ends of the device base 1 and the opposing yoke 5 forming the yoke in the head moving direction, but in the central portion of the head moving direction and the head. The magnetic flux does not saturate even if the magnetic sheet metal member forming the yoke is made sufficiently thinner than the conventional one because it also flows in the direction perpendicular to the moving direction. Therefore,
Since the yoke of the linear motor can be made thinner than before,
The device can be made thinner. Further, since the device base can be formed as a part of the linear motor and can be formed by one magnetic sheet metal member, the cost of the device can be reduced.

Next, FIG. 3 is a perspective view of an essential part of an information recording / reproducing apparatus showing a second embodiment of the present invention, and FIG. 4 is a second view shown in FIG.
4A and 4B are diagrams showing details of the linear motor magnetic circuit in the embodiment of the present invention, in which FIG. 3A is a sectional view taken along line III-III in FIG. 3, and FIG. Hereinafter, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. 3 and 4, the device base 1 and the opposing yoke 5 are integrally formed by bending a single magnetic sheet metal member. In this embodiment, as compared with the first embodiment, both ends of the device base 1 and the opposing yoke 5 in the head moving direction (A direction in the drawing) are not magnetically coupled in the head moving direction, The ends in the direction perpendicular to the moving direction are magnetically coupled over a long range in the head moving direction. For this reason, like the first embodiment, the magnetic sheet metal member forming the yoke does not saturate the magnetic flux even if the magnetic sheet metal member is made sufficiently thinner than the conventional one. Therefore, the same effect as that of the first embodiment can be obtained, and the number of parts can be reduced.

Next, FIG. 5 is a diagram showing details of the linear motor magnetic circuit in the third embodiment of the present invention.
(A) is a principal part plan view of a linear motor, (b) is the VV sectional view taken on the line of (a), (c) is the VI-VI sectional view taken on the (b). In the figure, between the device base 1 and the opposing yoke 5, flat plate-shaped permanent magnets 2 are fixed to the device base 1 and the opposing yoke 5, respectively, and a gap 4 sandwiched between the flat plate-shaped permanent magnets 2 is formed.
A magnetic field similar to that in the first and second embodiments is formed on the. The opposing yoke 5 has a width sufficiently wider than that of the flat plate-shaped permanent magnet 2 on the side not magnetically coupled to the apparatus base 1 in the direction perpendicular to the head moving direction (direction A in the figure). .

In the linear motor magnetic circuit having the above-described structure, the magnetic flux in the opposing yoke 5 flows to both sides in the direction perpendicular to the head moving direction as compared with the first and second embodiments, so that the yoke is The magnetic flux is not saturated even if the constituent magnetic sheet metal member is made much thinner. Further, since the plate-shaped permanent magnets 2 are fixed to the device base 1 and the opposing yoke 5, respectively, the carriage member 7 is provided on both sides of the quadrilateral flat coil 6 at the joint portion of the quadrilateral flat coil 6 and the carriage member 7.
Since the thickness can be secured, the rigidity of the connecting portion between the quadrilateral flat coil 6 and the carriage member 7 can be made equal to that of the first and second embodiments. Here, the flat plate-shaped permanent magnets 2 are arranged on both sides of the quadrilateral flat coil 6, but the thickness of the flat plate-shaped permanent magnet 2 is 1/2 that in the first and second embodiments, and an equivalent magnetic field is obtained. Therefore, it goes without saying that the distance between the device base 1 and the opposing yoke 5 is the same as in the first and second embodiments.

Next, FIG. 6 is a perspective view of an essential part of an information recording / reproducing apparatus showing a fourth embodiment of the present invention. In the figure, the apparatus base 1 has a positioning portion 9 for positioning both ends of a shaft member 8 for movably supporting a carriage member 7 on which a recording / reproducing head 3 is mounted in a head moving direction (A direction in the drawing). It is integrally formed by bending a magnetic sheet metal member forming the device base 1. Further, a positioning portion 11 for positioning the spindle motor 10 for rotationally driving the information recording medium is integrally formed on the apparatus base 1 by punching and half-punching the magnetic sheet metal member forming the apparatus base 1. Has been done. These positioning parts 9,
High precision can be obtained by performing secondary processing after forming 11 in the press working step of forming the device base 1.

Next, FIG. 7 shows the construction of the positioning portions 9 and 11 in the fifth embodiment of the present invention. In the figure, a positioning portion 9 for positioning both ends of the shaft member 8 and a positioning portion 11 for positioning the spindle motor 10 are provided on the device base 1 with respect to the magnetic sheet metal member forming the device base 1. 12 is formed by outsert molding. To form these positioning portions 9 and 11, a resin molding process is required after the press working process for forming the device base 1, but high accuracy can be obtained without secondary processing.

Next, FIG. 8 shows the construction of the quadrilateral flat coil 6 in the sixth embodiment of the present invention. In the figure, the carriage member 7 is formed by resin molding, and the quadrilateral flat coil 6 is insert-molded into the carriage member 7. In addition, 2 of the quadrilateral flat coil 6
The space 12 surrounded by the pair of substantially parallel opposite sides is filled with the resin 12, and the resin 12 firmly fixes the quadrilateral flat coil 6 to the carriage member 7, and The rigidity is improved.

Next, FIG. 9 shows the construction of the quadrilateral flat coil 6 in the seventh embodiment of the present invention. In the same drawing, as in the sixth embodiment, the quadrilateral flat coil 6 is insert-molded with respect to the carriage member 7, and the space 13 surrounded by two substantially parallel opposite sides of the quadrilateral flat coil 6 is provided. The resin 12 is filled. A magnetic member 14 is insert-molded in the resin 12 filled in the space 13, and an attractive force in a direction perpendicular to the quadrilateral flat coil 6 is exerted on the magnetic member 14 due to the influence of the magnetic field in the gap 4.

Two shaft members 8 as shown in FIG.
In the carriage supporting mechanism using the carriage member 7, the carriage member 7 is arranged in a direction perpendicular to the head moving direction with respect to the shaft member 8 so that the carriage member 7 is not displaced in a direction other than the head moving direction with respect to the shaft member 8 due to vibration or impact. Need to be urged. For this reason, conventionally, a structure in which a ball bearing is attached to a carriage member via a leaf spring and the ball bearing rolls on a shaft member is generally used, which increases the number of parts and complicates assembly work. And increased the size of the device. On the other hand, in the seventh embodiment, only the magnetic member 14 is used as a component, and insert molding can be performed at the same time as molding of the carriage member 7, and by utilizing the space 13 of the quadrilateral flat coil 6 which is a dead space, Equivalent operation is possible.

Next, FIGS. 10 and 11 show an eighth embodiment of the present invention. In FIG. 10, the carriage member 7 in which the quadrilateral flat coil 6 and the magnetic member 14 are insert-molded is provided with a groove 15 having a U-shaped cross section into which the shaft member 8 is fitted. In addition, in this embodiment, both ends of the shaft member 8 are insert-molded with the resin 12 outsert-molded with respect to the apparatus base 1 as shown in FIG. In the case of the carriage urging method using a ball bearing or a leaf spring as in the past, it was necessary to insert the shaft member 8 into the carriage member 7 and then attach the shaft member 8 to the apparatus base 1.
In the case of the carriage urging system of the seventh embodiment, even after the shaft member 8 is attached to the apparatus base 1 in advance, the carriage member 7 has the fitting portion of the shaft member 8 with the groove 1 having a U-shaped cross section.
By setting the number to 5, the assembling becomes possible. Further, the linear motor system of the present invention is based on the conventional Japanese Patent Laid-Open No. 2-19963.
Unlike the method described in Japanese Patent Laid-Open No. 1-No. 1, it is not necessary to insert the inner yoke into the coil. Therefore, by adopting the configuration of the eighth embodiment, the workability of the step of attaching the carriage to the apparatus base is better than that of the conventional one. Is also significantly improved. Further, the shaft member 8 is attached to the apparatus base 1 by using a structure in which the positioning member 9 is pressed by a leaf spring or the like.
By insert molding, the number of parts can be reduced and the mounting accuracy can be improved.

Next, FIG. 12 shows a ninth embodiment of the present invention. In the same figure, as in the eighth embodiment, the carriage member 7 in which the quadrilateral flat coil 6 and the magnetic member 14 are insert-molded is provided with a groove 15 having a U-shaped cross section into which the shaft member 8 is fitted. There is. Here, the resin 12 in the space 13 of the quadrilateral flat coil 6 in which the magnetic member 14 is insert-molded protrudes from the quadrilateral flat coil 6 in the direction opposite to the opening direction of the groove 15 having a U-shaped cross section. The raised convex portion 16 is formed. With the above configuration, the groove 15 having a U-shaped cross section with respect to the carriage member 7 due to impact or the like.
Even when a large force is applied in the direction opposite to the opening direction of the carriage member 7 and the carriage member 7 is displaced against the attraction force acting on the magnetic member 14, the quadrilateral flat coil 6 does not directly collide with the yoke or the permanent magnet, It is possible to reliably prevent a failure such as a disconnection of the quadrilateral flat coil 6.

Next, FIG. 13 shows a tenth embodiment of the present invention. In the drawing, in the linear motor of the present embodiment, the magnetic member 14 has a distance L1 between the magnetic member 14 and the flat permanent magnet 2 in the opening direction of the groove 15 having a U-shaped cross section, and the magnetic member 14 and the cross section U. The distance from the opposing yoke 5 in the direction opposite to the opening direction of the U-shaped groove 15 is L2, and the groove 1 having a U-shaped cross section
When the distance between the opposing yoke 5 and the convex portion 16 projecting from the quadrilateral flat coil 6 in the direction opposite to the opening direction of 5 is L3, the relationship of L2-L3> L1 + L3 is established. There is. With the above-described configuration, a large force is applied to the carriage member 7 in the direction opposite to the opening direction of the groove 15 having a U-shaped cross section due to impact or the like, and the carriage member 7 resists the attraction force acting on the magnetic member 14. Even when the convex portion 16 is displaced and the opposing yoke 5 comes into contact, the attraction force acting on the magnetic member 14 is always larger in the direction toward the flat permanent magnet 2 than in the direction toward the opposing yoke 5. The carriage member 7 can surely return to the original state.

[0029]

As described above, in the information recording / reproducing apparatus according to the first aspect, the magnetic flux in the magnetic circuit of the linear motor is limited only to both ends of the device base constituting the yoke and the opposing yoke in the head moving (driving) direction. Instead of focusing on
The magnetic flux does not saturate even if the magnetic sheet metal member forming the yoke is made sufficiently thinner than the conventional one, because the magnetic flux also flows in the central portion in the head moving direction and in the direction perpendicular to the head moving direction. Therefore, the yoke of the linear motor can be made thinner than before, so that the device can be made thinner, and the device base can be made a part of the linear motor and can be formed of one magnetic sheet metal member. Therefore, the cost of the device can be reduced.

In the information recording / reproducing apparatus of the second aspect,
Since the device base and the yoke of the linear motor can be formed by only one magnetic sheet metal member, the number of parts can be reduced,
The cost of the device can be reduced by reducing the number of parts, and since the yoke of the linear motor is a single seamless plate, the loss in the magnetic circuit is minimized, the efficiency of the linear motor is improved, and the device Performance can be improved.

In the information recording / reproducing apparatus of claim 3,
Since the yoke of the linear motor can be made thinner without lowering the rigidity of the carriage, the device can be made thinner, and the magnetic sheet metal member forming the device base and the yoke of the linear motor can be made thinner. As a result, the processing accuracy can be improved and the processing cost can be reduced, and the performance of the device can be improved and the cost can be further reduced.

In the information recording / reproducing apparatus of the fourth aspect,
Since the carriage supporting member and the positioning portion of the spindle motor can be integrally formed on the device base, the number of parts can be reduced, and the cost of the device can be further reduced by reducing the number of parts.

In the information recording / reproducing apparatus of the fifth aspect,
Since the carriage supporting member and the positioning part of the spindle motor can be integrally formed on the device base with high accuracy, the number of parts can be reduced, and the cost of the device can be further reduced by reducing the number of parts and secondary processing. Becomes

In the information recording / reproducing apparatus of the sixth aspect,
By insert-molding the coil into the carriage, the assembly process can be reduced, the assembly process can be reduced, and the cost of the device can be further reduced, and the rigidity of mounting the coil on the carriage and the rigidity of the coil alone can be enhanced. Since the generation of harmful resonance can be prevented, the performance of the device can be improved.

In the information recording / reproducing apparatus of claim 7,
Since the urging structure required for the carriage can be configured with only a single component without requiring an assembling process or an installation space, it is possible to reduce the size and thickness of the device and reduce the cost.

In the information recording / reproducing apparatus of the eighth aspect,
The workability of the process of attaching the carriage to the equipment base is significantly improved compared to the conventional method, and the assembly work cost is reduced.In addition, by inserting the shaft member into the equipment base, the number of parts can be reduced and the installation can be done. The accuracy can be improved, and the cost and performance of the device can be reduced.

In the information recording / reproducing apparatus of claim 9,
Since the disconnection of the coil due to the impact can be prevented with the simple structure without increasing the number of parts, the reliability of the device can be improved without increasing the cost.

In the information recording / reproducing apparatus of the tenth aspect, since the carriage can be prevented from being disengaged due to impact without increasing the number of parts with a simple structure, the reliability of the apparatus can be improved without increasing the cost. Becomes

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of an information recording / reproducing apparatus showing a first embodiment (claim 1) of the present invention.

2 is a diagram showing details of the linear motor magnetic circuit in the first embodiment shown in FIG. 1, in which FIG.
FIG. 2B is a sectional view taken along line I-II of FIG.

FIG. 3 is a perspective view of an essential part of an information recording / reproducing apparatus showing a second embodiment (claim 2) of the present invention.

FIG. 4 is a diagram showing details of a linear motor magnetic circuit in the second embodiment shown in FIG. 3, in which (a) is III of FIG.
-III line sectional drawing, (b) is the IV-IV sectional view taken on the line of (a).

5A and 5B are diagrams showing details of a linear motor magnetic circuit in a third embodiment of the present invention (claim 3), in which (a) is a plan view of a main portion of the linear motor and (b) is (a). 5 is a sectional view taken along line VV of FIG.

FIG. 6 is a perspective view of the essential parts of an information recording / reproducing apparatus showing a fourth embodiment (Claim 4) of the present invention.

7A and 7B are views showing a fifth embodiment of the present invention (claim 5), in which (a) is a sectional view of an essential part showing a configuration of a positioning portion of the supporting member shown in FIG. 6, and (b) is FIG. 7 is a cross-sectional view of essential parts showing the configuration of a positioning part of the spindle motor shown in FIG. 6.

FIG. 8 is a diagram showing a sixth embodiment (claim 6) of the present invention and is a perspective view of a main portion showing a configuration of a quadrilateral flat coil.

FIG. 9 is a diagram showing a seventh embodiment (Claim 7) of the present invention and is a perspective view of essential parts showing a configuration of a quadrilateral flat coil.

FIG. 10 is a view showing an eighth embodiment of the present invention (claim 8) and is a perspective view of a main part of a carriage member in which a quadrilateral flat coil and a magnetic material are insert-molded.

11 is a cross-sectional view of relevant parts showing an attachment portion of the shaft member shown in FIG. 10 to the device base.

FIG. 12 is a view showing a ninth embodiment (claim 9) of the present invention and is a perspective view of a main part of a carriage member in which a quadrilateral flat coil and a magnetic material are insert-molded.

FIG. 13 is a cross-sectional view of essential parts of a linear motor showing a tenth embodiment (claim 10) of the present invention.

[Explanation of symbols]

 1: Device base 2: Permanent magnet 3: Recording / reproducing head 4: Gap 5: Opposing yoke 6: Quadrilateral flat coil 7: Carriage member 8: Support member (shaft member) 9: Positioning part of support member 10: Spindle motor 11: Positioning part of spindle motor 12: Resin 13: Space part of quadrilateral flat coil 14: Magnetic member 15: U-shaped groove 16: Resin protrusion

Claims (10)

[Claims] 1. An information recording / reproducing apparatus for recording / reproducing information, wherein a linear motor for driving a recording / reproducing head (3) has a pair of parallel magnetic plates (1) and (5). A permanent magnet (2) is formed so that at least one of them forms a magnetic field in a direction perpendicular to the facing surface, and two magnetic fields of different directions are formed in the driving direction of the head (3).
And a pair of opposite sides of the quadrilateral flat coil (6) fixed to the head (3) and having two pairs of substantially parallel opposite sides, which are perpendicular to the driving direction of the head (3), The two parallel magnetic plates (1) and (5) are formed by arranging them in two magnetic fields having different directions formed therebetween, and the two parallel magnetic plates (1) and (5) are perpendicular to the driving direction of the head (3). One ends of are magnetically coupled to each other,
An information recording / reproducing apparatus characterized in that one of the two parallel magnetic plates (1) and (5) is a part of a sheet metal member forming the apparatus base (1). 2. The information recording / reproducing apparatus according to claim 1, wherein the two parallel magnetic plates (1) (5) and the device base (1) are formed by one sheet metal member. An information recording / reproducing apparatus characterized by: 3. The information recording / reproducing apparatus according to claim 1, wherein the two parallel magnetic plates (1) and (5) are provided with permanent magnets (2) on opposite surfaces thereof, respectively. The openings of the two parallel magnetic plates (1) and (5) which are not magnetically coupled in the direction perpendicular to the driving direction of the head (3) are end portions of the permanent magnet (2) in the same direction. And an information recording / reproducing apparatus characterized by being extended in the vertical direction. 4. The information recording / reproducing apparatus according to any one of claims 1 to 3, wherein the sheet metal member forming the apparatus base (1) comprises:
A support member (8) for movably supporting the head (3) and positioning portions (9, 11) of a spindle motor (10) for rotationally driving an information recording medium are integrally formed. Information recording / reproducing apparatus. 5. The information recording / reproducing apparatus according to claim 1, wherein the sheet metal member forming the apparatus base (1) comprises:
A supporting member (8) that movably supports the head (3) and positioning portions (9) and (11) of a spindle motor (10) that rotationally drives an information recording medium are formed by resin outsert molding. An information recording / reproducing apparatus characterized by the above. 6. The information recording / reproducing apparatus according to claim 1, wherein the carriage member (7) on which the head (3) is mounted and is movably supported by the supporting member is formed by molding a resin. Together with the carriage member (7)
An information recording / reproducing apparatus characterized in that the quadrilateral flat coil (6) is insert-molded in the. 7. The information recording / reproducing apparatus according to claim 1, wherein a magnetic member (14) is provided in a space (13) surrounded by two substantially parallel opposite sides of the quadrilateral flat coil (6). An information recording / reproducing apparatus characterized in that the resin is insert-molded with resin. 8. The information recording / reproducing apparatus according to claim 7, wherein the supporting member (8) is connected to a sheet metal member forming the apparatus base (1) by resin molding, and the carriage member (8). 7) is fitted with the support member (8) and has a groove (15) having a U-shaped cross section opened in the fitting portion in a direction perpendicular to the two parallel magnetic plates (1) (5). An information recording / reproducing apparatus characterized by being formed. 9. The information recording / reproducing apparatus according to claim 8, wherein at least a part of the resin for insert-molding the magnetic member (14) is in a direction opposite to the opening direction of the U-shaped groove (15) in cross section. An information recording / reproducing apparatus characterized in that it is projected more than the quadrilateral flat coil (6). 10. The information recording / reproducing apparatus according to claim 9, wherein the magnetic member (14) is opposed to the magnetic member (14) in the opening direction of the U-shaped groove (15) in cross section. ) (5) or the distance to the permanent magnet (2) is L
1. The distance between the magnetic member (14) and the magnetic plate (1) (5) or the permanent magnet (2) facing each other in the direction opposite to the opening direction of the U-shaped groove (15) in cross section is L2, U-shaped cross section Groove (1
5) the resin protrusion (1) in the direction opposite to the opening direction.
An information recording / reproducing apparatus, which is arranged at a position such that L2−L3> L1 + L3, where L3 is the distance between 6) and the magnetic plate (1) (5) or the permanent magnet (2).