JP3343410B2 - Information recording / reproducing device - Google Patents

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 apparatus such as an optical disk drive or a magnetic disk drive, and more particularly to an information recording / reproducing apparatus characterized by a linear motor (seek motor) for driving a recording / reproducing head. About.

[0002]

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

[0003]

Problems to be Solved by the Invention
In the optical information recording / reproducing apparatus described in Japanese Patent Application Laid-Open No. 1 (1994), the device base is formed of a magnetic material. Generally, when forming a part with a magnetic material, the processing methods include cutting, casting and sintering, and sheet metal pressing.
Sheet metal presses are less expensive than casting and sintering. Therefore, in order to reduce the cost of the apparatus, it is desirable that the apparatus base is formed by a sheet metal press. However, the optical information recording / reproducing device described in the above publication has the following problems. First, 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 the magnetic flux from being saturated. is there. On the other hand, considering the rigidity of the device base, the magnetic material has high strength as a material,
The required thickness is much smaller than the yoke. For this reason, if the yoke and the device base are formed by one sheet metal member, the device base becomes unnecessarily thick. Further, the necessity of making the yoke thick enough means that it is difficult to reduce the thickness of the device, and it is necessary to reduce the size of the current information recording / reproducing device as well as reducing the size of the device. It is difficult to cope with thinning. As a second problem, it is necessary to form a support member for movably supporting the optical head and a positioning portion for positioning the spindle motor for rotating and driving the information recording medium with high accuracy on the apparatus base. However, when the sheet metal member forming the device base is thick, it is difficult to integrally form these positioning portions by press working, and when these positioning portions are attached to the device base as separate components, it is necessary to ensure accuracy. Is difficult. Due to these problems, in the case of the optical information recording / reproducing device described in the above-mentioned publication, it is almost impossible to form the device base by a sheet metal press, which is a major obstacle to reducing the cost of the device.

The present invention has been made in view of the above circumstances, and it is possible to make the yoke of a linear motor for driving a recording / reproducing head thinner than before, to make the whole apparatus thinner, and to reduce the cost of the apparatus. It is another object of the present invention to provide an information recording / reproducing apparatus which enables the information recording / reproduction.

[0005]

In order to achieve the above object, an information recording / reproducing apparatus having a first configuration according to the present invention includes a recording / reproducing head (3) and the recording / reproducing head (3). The carriage member (7), and two driving linear motors provided on both sides of the carriage member (7) to drive the recording / reproducing head (3) together with the carriage member (7). Each drive linear motor provided on both sides of 7) has two parallel magnetic plates (1) and (5), the yoke having an opening on the carriage member side, and the two parallel magnetic plates ( 1)
The magnetic field is arranged on at least one of the opposing surfaces of (5) and forms a magnetic field in a direction perpendicular to the opposing surface, and is magnetized so that two magnetic fields having different directions in the driving direction of the head (3) are formed. Flat permanent magnet (2), and a quadrangular flat coil (6) having two pairs of substantially parallel opposite sides fixed to the end of the carriage member (7). 6) 1 perpendicular to the driving direction of the head (3);
The opposite sides of the set are respectively arranged in two magnetic fields having different directions formed between the facing surfaces, and two parallel magnetic plates (1) and (5) constituting the yoke are provided with the head (3). ) In the driving direction is longer than the length of the permanent magnet (2), and one end of the head (3) in a direction perpendicular to the driving direction is magnetically coupled to each other over a range that is longer in the head driving direction. And at least one of the two parallel magnetic plates (1) and (5) is an apparatus base (1).
(FIGS. 1 and 2).

[0006] The information recording / reproducing apparatus of the second configuration has a first configuration.
In the information recording / reproducing apparatus having the above configuration, the two parallel magnetic plates (1) and (5) and the device base (1) are formed by one sheet metal member (FIG. 3, FIG. 3).
4).

[0007] The information recording / reproducing apparatus of the third configuration comprises a
Alternatively, in the information recording / reproducing apparatus of the second configuration , the two parallel magnetic plates (1) and (5) each have a permanent magnet (2) disposed on the opposing surface thereof, and The openings of the magnetic plates (1) and (5) that are not magnetically coupled in the direction perpendicular to the driving direction of the head (3) are larger than the ends of the permanent magnets (2) in the same direction. It is extended in a vertical direction and has a width sufficiently larger than the permanent magnet (2) (FIG. 5).

[0008] The information recording / reproducing apparatus of the fourth configuration comprises :
In the information recording / reproducing apparatus according to any one of the third to third aspects, a supporting member (8) for movably supporting a carriage member (7) on which the head (3) is mounted in a head driving direction, and rotating the information recording medium. A spindle motor (10) to be driven is provided, and a positioning portion (9) for positioning both ends of the support member (8) is integrally formed by bending a sheet metal member forming the device base (1). And the apparatus base (1) has the spindle motor (10)
Positioning part (11) for positioning the device base (1)
Are formed integrally by punching and half-punching the sheet metal member forming (FIG. 6).

In the information recording / reproducing apparatus according to any one of the first to third constitutions , a supporting member for movably supporting the head (3) is provided on a sheet metal member forming the apparatus base (1). The positioning portion (9) of (8) and the positioning portion (11) of the spindle motor (10) for rotatingly driving the information recording medium can be formed by outsert molding of resin (FIG. 7).

[0010] The information recording / reproducing apparatus of the fifth configuration comprises :
In the information recording / reproducing apparatus of any one of the fourth to fourth configurations , the carriage member (7) on which the head (3) is mounted is formed by molding resin, and the carriage member (7) has the quadrilateral shape. The flat coil (6) is insert-molded, and the square flat coil (6)
A space surrounded by substantially parallel opposite sides of the set is filled with a resin (12) (FIG. 8).

The information recording / reproducing apparatus of the sixth configuration comprises a first
In the information recording / reproducing apparatus according to any one of the fifth to fifth aspects , the magnetic member (14) is made of resin in the space (13) surrounded by two substantially parallel opposite sides of the quadrangular flat coil (6). It is featured by insert molding (FIG. 9).

The information recording / reproducing apparatus of the seventh configuration has a sixth configuration.
The information recording / reproducing apparatus having the above structure further comprises a support member (8) for supporting a carriage member (7) on which the head (3) is mounted so as to be movable in a head driving direction, and the support member (8) is provided on the apparatus base. (1) The carriage member (7) is connected to the sheet metal member forming the resin member by resin molding, and the carriage member (7) is fitted to the support member (8) and the two parallel magnetic plates are fitted to the fitting portion. (1) A groove (15) having a U-shaped cross section opened in a direction perpendicular to (5) is formed (FIGS. 10 and 11).

An information recording / reproducing apparatus having an eighth configuration has a seventh configuration.
In the information recording / reproducing apparatus having the above configuration , the magnetic member (1)
At least a portion of the resin for insert molding of (4) is characterized by projecting from the quadrangular flat coil (6) in a direction opposite to the opening direction of the U-shaped groove (15) in cross section (FIG. 12). ).

An information recording / reproducing apparatus having a ninth configuration is similar to the eighth embodiment.
In the information recording / reproducing apparatus having the above configuration , the magnetic member (1)
4) The magnetic member (14) and the U-shaped groove (1)
The distance between the magnetic plate (1) (5) or the permanent magnet (2) facing in the opening direction of 5) is L1, the magnetic member (1
4) The distance between the magnetic plate (1) (5) or the permanent magnet (2) opposed in the direction opposite to the opening direction of the U-shaped groove (15) is L2, and the U-shaped groove (15) is When the distance between the resin projecting portion (16) and the magnetic plate (1) (5) or the permanent magnet (2) in the direction opposite to the opening direction is L3, they are arranged at positions where L2−L3> L1 + L3. (Fig. 1
3). Here, in the information recording / reproducing apparatus according to the present invention,
Of the above configurations, the first to seventh configurations are the basic configuration.
In particular, the eighth configuration (Claim 1) and the ninth configuration (Claim 1)
2) is adopted.

[0015]

In the information recording / reproducing apparatus of the first configuration according to the present invention, the recording / reproducing head (3), the carriage member (7) on which the recording / reproducing head (3) is mounted, and the carriage member (7) 7) two drive linear motors provided on both sides of the carriage member (7) for driving the recording / reproducing head (3) together with the carriage member (7), and each drive linear motor provided on both sides of the carriage member (7). The motor is 2
A yoke composed of two parallel magnetic plates (1) and (5) and having an opening on the carriage member side; and a yoke disposed on at least one of opposing surfaces of the two parallel magnetic plates (1) and (5) of the yoke. A plate-shaped permanent magnet (2) magnetized so as to form a magnetic field in a direction perpendicular to the plane and to form two magnetic fields having different directions in the driving direction of the head (3);
A rectangular flat coil (6) having two substantially parallel opposite sides fixed to an end of the carriage member (7), and a driving direction of the head (3) of the rectangular flat coil (6); A pair of opposite sides perpendicular to are arranged in two magnetic fields formed in different directions between the opposing surfaces, respectively, and two parallel magnetic plates (1) and (5) constituting the yoke include:
The length of the head (3) in the driving direction is longer than the length of the permanent magnet (2), and one end of the head (3) in the direction perpendicular to the driving direction is magnetically mutually separated over a range that is longer in the head driving direction. And at least one of the two parallel magnetic plates (1) and (5) is a part of a sheet metal member forming the apparatus base (1). In the magnetic circuit of the linear motor, the magnetic flux is not concentrated only on both ends of the device base (1) and the opposing yoke (5) constituting the yoke in the head moving (driving) direction. Since the magnetic flux also flows in the direction perpendicular to the direction, the magnetic flux does not saturate even if the magnetic sheet metal member constituting the yoke is made sufficiently thinner than before. Therefore, the yoke of the linear motor can be made thinner than before, so that the device can be made thinner. In addition, since the device base can be formed as a part of the linear motor and formed of one magnetic sheet metal member, the cost of the device can be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a perspective view of a main part of an information recording / reproducing apparatus showing a first embodiment of the present invention, and FIG. 2 is a diagram showing details of a linear motor magnetic circuit in the first embodiment shown in FIG. 1A is a cross-sectional view taken along line II of FIG. 1, and FIG.
FIG. 2 is a sectional view taken along line II-II. Further, reference numeral 1 in the drawing denotes an apparatus base,
2 is a permanent magnet, 3 is a read / write head, 4 is a gap, 5 is an opposing yoke, 6 is a quadrangular flat coil, and 7 is a carriage member. In FIGS. 1 and 2, the information recording / reproducing apparatus
Recording / reproducing head 3 and a carrier equipped with recording / reproducing head 3
Cartridge member 7 and keys provided on both sides of the carriage member 7.
2 for driving the recording / reproducing head 3 together with the carriage member 7
And two carriage linear motors,
Each drive linear motor provided on the side has two parallel
A magnetic plate 1 or 5 having an opening on the carriage member side.
And the opposing surfaces of two parallel magnetic plates 1 and 5 of the yoke
A magnetic field arranged in at least one of
Field and a direction in the driving direction of the head 3
Plate magnetized so as to form two different magnetic fields
Fixed to the end of the carriage member 7 and the permanent magnet 2
A rectangular flat coil 6 having two pairs of substantially parallel opposite sides.
One of the two parallel magnetic plates 1 and 5 is
It is a part of a sheet metal member forming the base 1. More specifically
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 arranged on the device base 1 such that different magnetic poles are adjacent to each other in the moving direction of the recording / reproducing head 3 (direction A in the drawing). It is fixed. In the direction opposite to the device base 1 of the permanent magnet 2, an opposing yoke 5 formed by a single magnetic sheet metal member via a gap 4 is disposed in parallel with the device base 1. Are fixed to and magnetically coupled to the apparatus base 1 at both ends in the head movement direction, and one end of the opposing yoke 5 in a direction perpendicular to the head movement direction is bent substantially at a right angle to the apparatus base 1. On the other hand, they are joined and magnetically coupled. In this embodiment, by configuring the magnetic circuit as described above, two magnetic fields perpendicular to the device base 1 and having different directions are formed in the gap 4. In the gap 4, a quadrangular flat coil 6 having two pairs of opposite sides that are parallel to the apparatus base 1 and substantially parallel to each other is disposed, and one pair of the quadrangular flat coils 6 is perpendicular to the head moving direction. Are configured such that each of the opposite sides is located in a magnetic field in which the direction of the air gap 4 is different. The quadrangular flat coil 6 is fixed to the carriage member 7 of the recording / reproducing head 3, and by supplying a current to the quadrangular flat coil 6, the recording / reproducing head 3 is driven in the moving direction.

In the linear motor magnetic circuit having the above-described structure, the magnetic flux is not concentrated only on both ends of the device base 1 and the opposing yoke 5 constituting the yoke in the head moving direction. The magnetic flux does not saturate even if the thickness of the magnetic sheet metal member constituting the yoke is made sufficiently thinner than in the prior art 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. In addition, since the device base can be formed as a part of the linear motor and formed of one magnetic sheet metal member, the cost of the device can be reduced.

Next, FIG. 3 is a perspective view of a main part of an information recording / reproducing apparatus showing a second embodiment of the present invention, and FIG. 4 is a second embodiment shown in FIG.
3A and 3B are diagrams showing details of a linear motor magnetic circuit according to the embodiment of the present invention, wherein FIG. 3A is a sectional view taken along the line III-III of FIG. 3 and FIG. 3B is a sectional view taken along the line IV-IV of FIG. Hereinafter, portions equivalent to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. 3 and 4, the apparatus base 1 and the opposing yoke 5 are integrally formed by bending a single magnetic sheet metal member. In this embodiment, both ends of the apparatus base 1 and the opposing yoke 5 in the head moving direction (direction A in the drawing) are not magnetically coupled in the head moving direction as compared with the first embodiment. An end perpendicular to the moving direction is magnetically coupled over a long range in the head moving direction. Therefore, as in the first embodiment, the magnetic flux does not saturate even if the thickness of the magnetic sheet metal member constituting the yoke is made sufficiently thinner than in the prior art. Therefore, the same operation and effect as those of the first embodiment can be obtained, and the number of parts can be reduced.

FIG. 5 is a diagram showing details of a linear motor magnetic circuit according to a third embodiment of the present invention.
5A is a plan view of a main part of a linear motor, FIG. 5B is a cross-sectional view taken along line VV of FIG. 5A, and FIG. 5C is a cross-sectional view taken along line VI-VI of FIG. In the figure, between the apparatus base 1 and the opposing yoke 5, a flat permanent magnet 2 is fixed to each of the apparatus base 1 and the opposing yoke 5, and an air gap 4 sandwiched between the flat permanent magnets 2 is provided.
, A magnetic field similar to that of the first and second embodiments is formed. The side of the opposing yoke 5 that is not magnetically coupled to the apparatus base 1 in a direction perpendicular to the head moving direction (the direction A in the drawing) has a width sufficiently larger than the flat permanent magnet 2. .

In the linear motor magnetic circuit having the above-described structure, the magnetic flux in the opposing yoke 5 flows on both sides in the direction perpendicular to the head moving direction as compared with the first and second embodiments. The magnetic flux does not saturate even if the constituent magnetic sheet metal members are 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 members 7 are provided on both sides of the quadrangular flat coil 6 at the joint of the quadrangular flat coil 6 and the carriage member 7.
Therefore, the rigidity of the joint between the quadrangular flat coil 6 and the carriage member 7 can be made equal to those of the first and second embodiments. Here, the plate-shaped permanent magnets 2 are arranged on both sides of the quadrangular flat coil 6, but the thickness of the plate-shaped permanent magnets 2 is 1/2 that of the first and second embodiments, and an equivalent magnetic field is obtained. Therefore, it goes without saying that the distance between the apparatus base 1 and the opposing yoke 5 is equal to that in the first and second embodiments.

FIG. 6 is a perspective view of an essential part of an information recording / reproducing apparatus according to a fourth embodiment of the present invention. In the figure, a positioning portion 9 for positioning both ends of a shaft member 8 that supports a carriage member 7 on which the recording / reproducing head 3 is mounted so as to be movable in a head moving direction (direction A in the drawing) is provided on the apparatus base 1. The magnetic sheet metal member forming the apparatus base 1 is formed integrally by bending. A positioning unit 11 for positioning a spindle motor 10 for rotating and driving the information recording medium is integrally formed on the apparatus base 1 by punching and half-punching a magnetic sheet metal member forming the apparatus base 1. Have been. These positioning parts 9,
11 is formed in a press working step for forming the apparatus base 1 and then subjected to secondary processing to obtain high accuracy.

FIG. 7 shows the configuration of the positioning portions 9 and 11 in a 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 apparatus base 1 with resin relative to a magnetic sheet metal member forming the apparatus base 1. 12 are formed integrally by outsert molding. In order to form the positioning portions 9 and 11, a resin molding process is required after the press working process for forming the apparatus base 1, but high accuracy can be obtained without performing the secondary working.

FIG. 8 shows the configuration of the quadrangular flat coil 6 in the sixth embodiment of the present invention. In the figure, a carriage member 7 is formed by molding resin, and a quadrangular flat coil 6 is insert-molded into the carriage member 7. In addition, the quadrangular flat coil 6-2
A resin 13 is filled in a space 13 surrounded by substantially parallel opposite sides of the set, and the quadrangular flat coil 6 is firmly fixed to the carriage member 7 by the resin 12. The rigidity is improved.

Next, FIG. 9 shows the configuration of the quadrangular flat coil 6 in the seventh embodiment of the present invention. In the same drawing, the quadrangular flat coil 6 is insert-molded to the carriage member 7 as in the sixth embodiment, and a space 13 surrounded by two substantially parallel opposite sides of the quadrangular flat coil 6 is provided. 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 quadrangular flat coil 6 acts on the magnetic member 14 under the influence of the magnetic field of 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 moved 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 biased. Conventionally, therefore, a structure in which a ball bearing is mounted on 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. This has led to an increase in the size and size of the device. On the other hand, in the seventh embodiment, the component is only the magnetic member 14 and can be insert-molded at the same time as the carriage member 7 is formed, and by utilizing the space 13 of the quadrangular flat coil 6 which has been a dead space, Equivalent operation is possible.

Next, FIGS. 10 and 11 show an eighth embodiment of the present invention. In FIG. 10, a carriage member 7 in which a quadrangular flat coil 6 and a magnetic member 14 are insert-molded has a U-shaped groove 15 in which a shaft member 8 is fitted. In this embodiment, both ends of the shaft member 8 are insert-molded into a resin 12 which is outsert-molded with respect to the apparatus base 1 as shown in FIG. In the case of a carriage biasing method using a ball bearing or a leaf spring as in the related art, it is 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 allows the fitting portion of the shaft member 8 to have the U-shaped groove 1.
By setting it to 5, assembly becomes possible. Further, the linear motor system of the present invention is disclosed in Japanese Patent Application Laid-Open No. 2-19963.
Unlike the method described in Japanese Patent Laid-Open Publication No. 1 (1993), there is no need to insert an inner yoke into the coil. Therefore, by adopting the configuration as in the eighth embodiment, the workability of the step of mounting the carriage on the apparatus base is improved. Is also significantly improved. In addition, the attachment of the shaft member 8 to the apparatus base 1 has conventionally used a configuration in which the shaft member 8 is pressed against the positioning portion 9 by a leaf spring or the like.
By insert molding, it is possible to reduce the number of parts and improve the mounting accuracy.

Next, FIG. 12 shows a ninth embodiment of the present invention. In the same drawing, as in the eighth embodiment, a U-shaped groove 15 in which the shaft member 8 is fitted is formed in the carriage member 7 in which the quadrangular flat coil 6 and the magnetic member 14 are insert-molded. I have. Here, the resin 12 in the space 13 of the quadrangular flat coil 6 in which the magnetic member 14 is insert-molded protrudes from the rectangular flat coil 6 in a direction opposite to the opening direction of the groove 15 having a U-shaped cross section. A convex portion 16 is formed. With the above-described configuration, the groove 15 having a U-shaped cross section is formed in the carriage member 7 by an 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 quadrangular flat coil 6 does not directly collide with the yoke or the permanent magnet. Failures such as disconnection of the quadrangular flat coil 6 can be reliably prevented.

Next, FIG. 13 shows a tenth embodiment of the present invention. In the same figure, in the linear motor of this 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. 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 U-shaped groove 1
When the distance between the opposing yoke 5 and the convex portion 16 protruding from the quadrangular flat coil 6 in the direction opposite to the opening direction of L5 is L3, the relationship of L2-L3> L1 + L3 is established. I have. With the above-described configuration, a large force is applied to the carriage member 7 in a direction opposite to the opening direction of the groove 15 having a U-shaped cross section due to an impact or the like, and the carriage member 7 is opposed to the suction force acting on the magnetic member 14. Even when the convex portion 16 is displaced and the opposing yoke 5 comes into contact, the attractive force acting on the magnetic member 14 is always larger in the direction toward the plate-shaped 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 of the first configuration described above, the magnetic flux in the magnetic circuit of the linear motor is transmitted to the apparatus base and the head of the opposing yoke constituting the yoke. Since the magnetic flux does not concentrate only on both ends in the moving (driving) direction but also flows in the central part of the head moving direction or in a direction perpendicular to the head moving direction, even if the magnetic sheet metal member forming the yoke is sufficiently thinner than before, the magnetic flux is reduced. Does not saturate. Therefore, since the yoke of the linear motor can be made thinner than before, the thickness of the device can be reduced, and the device base can be formed as a part of the linear motor and formed of one magnetic sheet metal member. Thus, the cost of the apparatus can be reduced.

In the information recording / reproducing apparatus of the second configuration , the number of parts can be reduced because the apparatus base and the yoke of the linear motor can be formed by only one magnetic sheet metal member. And the yoke of the linear motor becomes a single seamless plate, minimizing the loss in the magnetic circuit, improving the efficiency of the linear motor and improving the performance of the device. .

In the information recording / reproducing apparatus of the third configuration , the yoke of the linear motor can be further reduced without lowering the rigidity of the carriage, so that the apparatus can be further reduced in thickness. By reducing the thickness of the magnetic sheet metal member that forms the yoke of the linear motor and the linear motor, machining accuracy can be improved and machining costs can be reduced.
It is possible to improve the performance of the device and further reduce the cost.

In the information recording / reproducing apparatus having the fourth configuration , the carriage support member and the positioning portion of the spindle motor can be integrally formed on the apparatus base, so that the number of parts can be reduced. Further cost reduction is possible.

[0033]

In the information recording / reproducing apparatus having the fifth configuration , the assembling step can be reduced by insert-molding the coil on the carriage, and the cost can be further reduced by reducing the assembling step. Since the resin is filled in the space surrounded by the two substantially parallel opposite sides of the quadrangular flat coil, the rigidity of mounting the coil to the carriage and the rigidity of the coil alone are enhanced, and the occurrence of harmful resonance can be prevented. Therefore, the performance of the device can be improved.

In the information recording / reproducing apparatus of the sixth configuration, the urging structure required for the carriage can be constituted by a single component without requiring an assembling step or installation space.・ Thinning and cost reduction are possible.

In the information recording / reproducing apparatus of the seventh configuration , the workability in the step of attaching the carriage to the apparatus base is significantly improved as compared with the prior art, so that the assembling work cost is reduced, and By insert-molding the shaft member, it is possible to reduce the number of components and to improve the mounting accuracy, and to reduce the cost and the performance of the device.

In the information recording / reproducing apparatus according to the eighth configuration (claim 1) , since the coil can be prevented from being broken by an impact without increasing the number of parts with a simple configuration, the cost of the apparatus can be reduced without increasing the cost. Reliability can be improved.

In the information recording / reproducing apparatus according to the ninth configuration (claim 2) , the carriage can be prevented from being detached due to an impact without increasing the number of components with a simple configuration, so that the apparatus can be manufactured without increasing the cost. Reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an information recording / reproducing apparatus according to a first embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing details of a linear motor magnetic circuit in the first embodiment shown in FIG. 1; FIG.
FIG. 2B is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a main part of an information recording / reproducing apparatus showing a second embodiment of the present invention.

4A and 4B are diagrams showing details of a linear motor magnetic circuit in the second embodiment shown in FIG. 3, wherein FIG.
FIG. 3B is a sectional view taken along the line III, and FIG. 3B is a sectional view taken along the line IV-IV in FIG.

5A and 5B are diagrams showing details of a linear motor magnetic circuit according to a third embodiment of the present invention, wherein FIG. 5A is a plan view of a main part of the linear motor, and FIG. 5B is a VV line of FIG. Sectional view,
(C) is a sectional view taken along line VI-VI of (b).

FIG. 6 is a perspective view of a main part of an information recording / reproducing apparatus showing a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a fifth embodiment of the present invention,
FIG. 7A is a cross-sectional view of a main part showing another example of the configuration of the positioning portion of the support member shown in FIG. 6, and FIG. 7B is a cross-sectional view of the main part showing another example of the positioning portion of the spindle motor shown in FIG. is there.

FIG. 8 is a view showing a sixth embodiment of the present invention, and is a perspective view of an essential part showing a configuration of a quadrangular flat coil.

FIG. 9 is a view showing a seventh embodiment of the present invention, and is a perspective view of an essential part showing a configuration of a quadrangular flat coil.

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

11 is a cross-sectional view of a main part showing a mounting portion of the shaft member shown in FIG. 10 to an apparatus base.

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

13 is a fragmentary cross-sectional view of a linear motor showing an embodiment of the first 0 of the present invention.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-52770 (JP, A) JP-A-3-71478 (JP, A) JP-A-2-133994 (JP, A) JP-A-4- 311886 (JP, A) JP-A-5-6632 (JP, A) JP-A-2-260178 (JP, A) JP-A-61-16962 (JP, U) JP-A-5-43781 (JP, U) Japanese Utility Model Application 1-90282 (JP, U) Japanese Utility Model Application 57-51060 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 21/02 G11B 7/085

Claims (2)

(57) [Claims] An information recording / reproducing apparatus for recording / reproducing information, comprising: a recording / reproducing head (3); a carriage member (7) on which the recording / reproducing head (3) is mounted; And (7) two driving linear motors provided on both sides of the carriage member (7) for driving the recording / reproducing head (3) together with the carriage member (7), and each driving linear motor provided on both sides of the carriage member (7). Linear motor is 2
A yoke composed of two parallel magnetic plates (1) and (5) and having an opening on the carriage member side; and a yoke disposed on at least one of opposing surfaces of the two parallel magnetic plates (1) and (5) of the yoke. A plate-shaped permanent magnet (2) magnetized so as to form a magnetic field in a direction perpendicular to the plane and to form two magnetic fields having different directions in the driving direction of the head (3);
A rectangular flat coil (6) having two substantially parallel opposite sides fixed to an end of the carriage member (7), and a driving direction of the head (3) of the rectangular flat coil (6); A pair of opposite sides perpendicular to are arranged in two magnetic fields formed in different directions between the opposing surfaces, respectively, and two parallel magnetic plates (1) and (5) constituting the yoke include:
The length of the head (3) in the driving direction is longer than the length of the permanent magnet (2), and one end of the head (3) in the direction perpendicular to the driving direction is magnetically mutually separated over a range that is longer in the head driving direction. is coupled to, and at least one of the parallel magnetic plate two said (1) (5), Ri part der of the sheet metal member forming the apparatus base (1), and, prior to
Surrounded by two substantially parallel opposite sides of the quadrilateral flat coil (6)
In the space (13), the magnetic member (14) is made of resin.
Insert-molded and the head (3)
Moves the mounted carriage member (7) in the head drive direction
And a support member (8) for supporting the support member.
(8) is for a sheet metal member forming the device base (1).
It is connected by resin molding and
The jig member (7) fits with the support member (8) and
The fitting portion is perpendicular to the two parallel magnetic plates (1) and (5).
U-shaped groove (15) opening in various directions is formed.
In the information recording / reproducing apparatus having the configuration described above, the magnetic member (14) is made of a resin having a small amount of insert-molded resin.
At least a part is opposed to the opening direction of the U-shaped groove (15).
And projecting more in the opposite direction than the quadrangular flat coil (6).
Information recording and reproducing apparatus, characterized in that out. 2. An information recording / reproducing apparatus according to claim 1, wherein said magnetic member (14) is in front of said magnetic member (14).
The magnets facing each other in the opening direction of the U-shaped groove (15)
Distance between the conductive plate (1) (5) or the permanent magnet (2)
1. How to open the magnetic member (14) and the U-shaped groove (15)
There are magnetic plates (1) and (5) opposed in the opposite direction
Or the distance from the permanent magnet (2) is L2, and the U-shaped groove (1
The resin protrusion (1) in a direction opposite to the opening direction of (5).
6) and a magnetic plate (1) (5) or a permanent magnet (2)
An information recording / reproducing apparatus characterized by being arranged at a position where L2-L3> L1 + L3 , where the interval is L3 .