JPH087556A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To obtain a magnetic recorder capable of mounting a circuit board on the housing without using screws and convenient in making the device thinner. CONSTITUTION:The device is furnished with the housing 2 providing a substrate mounting surface 6, and the circuit board 12 mounted on the substrate mounting surface of the housing in almost prallel therewith, on which circuit components are mounted on the surface opposed each other to this substrate mounting surface. An engaging protrusion 17 having a recessed groove 23 is projectingly provided on the substrate mounting surface of the housing, and also a retaining member 25 conformed to the engaging protrusion is arranged on the surface of the circuit board confronted with the substrate mounting surface. By this retaining member, the circuit board is held in the state parallel with the substrate mounting surface for preventing the fall-off in the manner of engaging with the recessed groove so as capable of fitting/unfitting, and also a hooking part 31 for keeping the space constant between the circuit board and the substrate mounting surface is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device used in, for example, a portable computer, and more particularly to a structure for mounting a circuit board on a housing containing the magnetic recording medium.

[0002]

2. Description of the Related Art A portable type small-sized computer is handling an enormous amount of data as the processing capability of a microprocessor is improved and a color liquid crystal display is adopted. Correspondingly, in recent computers, more and more models are equipped with a magnetic disk device, which is excellent in storage capacity and high-speed accessibility as standard, as compared with a floppy disk device.

This type of magnetic disk device has a box-shaped housing, and the inside of this housing forms a clean airtight space which is shielded from the outside air. A disk-shaped hard magnetic recording medium and various functional components such as a magnetic head for recording / reproducing data on / from the magnetic recording medium are collectively housed in the hermetic space.

Further, the housing has a board mounting surface at a portion exposed to the outside thereof. A circuit board for driving and controlling the magnetic disk device is arranged on the board mounting surface, and the circuit board is fixed to the housing via screws.

Therefore, in the conventional magnetic disk device,
A boss portion for receiving a screw is projected on the board mounting surface of the housing, and a protruding height of the boss portion is set to a size capable of accommodating a circuit component between the circuit board and the board mounting surface. . The screw penetrates the circuit board and is screwed into the boss.When the circuit board is screwed to the boss, the head of the screw is projected on the surface of the circuit board opposite to the housing. ing.

[0006]

Recently, portable computers have been reduced in size and weight in order to improve portability. Accordingly, even if a magnetic disk device built in a computer is used, the external dimensions thereof should be as small as possible. There is a request to keep it small.

However, in the conventional magnetic disk device,
Since the circuit board is screwed to the housing, there is a problem that the head of the screw protrudes onto the circuit board, and the thickness of the entire device including the circuit board increases by the amount of this head. In particular, in a thin magnetic disk device having a thickness of ½ inch, the protrusion amount of the screw head accounts for about 10% of the total thickness of the device, which is one of the factors that hinder the thinning of the magnetic disk device. ing.

The present invention has been made under such circumstances, and an object of the present invention is to provide a magnetic recording device which allows a circuit board to be attached to a housing without using screws and which can be further reduced in thickness. And

[0009]

In order to achieve the above object, a magnetic recording apparatus according to claim 1 has a box-shaped housing having an outer surface for mounting a substrate, and the outer surface of the housing having the outer surface. A circuit board mounted substantially in parallel and having a circuit component mounted on a surface facing the outer surface.

A protrusion having a locking portion is provided on the outer surface of the housing so as to project, and a stopper member corresponding to the protrusion is disposed on the surface of the circuit board facing the outer surface. The member releasably engages with the engaging portion to retain and hold the circuit board in a posture parallel to the outer surface, and a hook portion that keeps a constant distance between the circuit board and the outer surface. It is characterized by having.

According to a second aspect, in the first aspect, the distance between the outer surface of the housing and the circuit board is
It is characterized in that it is set to have a minimum size capable of accommodating the circuit component between the outer surface and the circuit board.

According to another aspect of the magnetic recording apparatus of the present invention, a box-shaped housing having an outer surface for mounting a substrate, a first connector arranged on the outer surface of the housing, and an outer surface of the housing are provided. The circuit board includes a circuit board mounted substantially parallel to the outer surface, and a second connector disposed on a surface of the circuit board facing the outer surface and fitted to the first connector in a removable manner.

The circuit board is provided with a locking means at a portion facing the housing so as to be releasably hooked on the housing so as to prevent the circuit board from being pulled out and held in a posture substantially parallel to the outer surface of the housing. It is characterized by having.

According to a fourth aspect of the present invention, the first connector and the second connector according to the third aspect of the present invention are butted against each other to maintain a constant distance between the outer surface of the housing and the circuit board. It is characterized by that.

According to a fifth aspect, the circuit board according to the fourth aspect has a circuit component mounted on a surface facing the outer surface of the housing, and a distance between the circuit board and the outer surface is It is characterized in that it has a minimum size capable of accommodating the above-mentioned circuit components.

[0016]

According to the structure of the present invention, since the circuit board is provided with the stop member on the surface facing the outer surface of the housing, the circuit board is opposed to the outer surface of the housing.
By hooking the hooking portion of the stopper member to the locking portion protruding from the outer surface, the circuit board can be fixed to the housing so as not to come off.

For this reason, the circuit board can be attached to the housing without using the conventional screws. In this case, since the fixed portion between the circuit board and the housing is inserted between the two, the fixed portion does not protrude or project on the surface of the circuit board opposite to the housing. The surface becomes flat. Therefore, the thickness of the entire device including the circuit board can be reduced.

According to the second aspect of the present invention, since the portion of the circuit board opposite to the housing on which the housing is fixed does not project and the surface is flat, the distance between the circuit board and the housing is reduced. Even if the size cannot be reduced, the thickness of the entire device including the circuit board can be reduced.

According to the third aspect, when the circuit board is opposed to the outer surface of the housing and the first connector and the second connector are fitted to each other, the fitting force holds the circuit board in the housing. Further, before and after this fitting, the locking means of the circuit board is caught in the housing, and
Since the separation of the connector and the second connector is prevented, the fitted state of these connectors can be maintained. Therefore, the circuit board can be attached to the housing without using screws as in the related art.

At the same time, since the locking means extends from the circuit board toward the housing, the locking means does not protrude or project on the surface of the circuit board opposite to the housing, and the circuit board does not project. It is possible to reduce the thickness of the entire device including.

According to claim 4, the first connector and the second connector
Since the circuit board is held in the housing by the fitting force generated in the fitting portion of the connector, the variation in the distance between the circuit board and the housing is prevented, and the mounting posture of the circuit board is stabilized.

According to the fifth aspect of the present invention, since the portion of the circuit board opposite to the housing on which the housing is fixed does not project and the surface is flat, the distance between the circuit board and the housing is reduced. Even if the size cannot be reduced, the thickness of the entire device including the circuit board can be reduced.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings applied to a magnetic disk device used in a portable computer. FIG. 1 shows a thin magnetic disk device 1 having a thickness of 1/2 inch. The magnetic disk device 1 includes a housing 2 made of metal, and the housing 2 has a flat rectangular box shape. The housing 2 includes a main body 3 having a bottom wall 3a, and the main body 3
Top cover 4 screwed to the side opposite to the bottom wall 3a
The interior of the housing 2 is a clean airtight space that is shielded from the outside air.

Inside the housing 2, a disc-shaped magnetic recording medium (not shown), a motor for rotating the magnetic recording medium, and a magnetic head for recording / reproducing data on / from the magnetic recording medium are used. Various functional parts are collectively housed, and the internal configuration of the housing 2 is the same as that of a conventionally known one, and therefore the description thereof is omitted.

By the way, the main body 3 is provided with a substantially flat substrate mounting surface 6 on the side opposite to the top cover 4. As shown in FIG. 2 and FIG. 4, the board mounting surface 6 is the bottom wall 3
The bottom wall 3a is formed on the surface exposed to the outside of a.
Of the circuit board 7 on the inner surface opposite to the board mounting surface 6 of
Is installed. The circuit board 7 is electrically connected to the motor and the magnetic head housed in the housing 2. A first connector 8 is arranged on the circuit board 7. The first connector 8 has a large number of pin terminals 8a, and these pin terminals 8a are through holes 9 formed in the bottom wall 3a.
And is projected on the substrate mounting surface 6.

A main circuit board 12 for driving and controlling the magnetic disk device 1 is arranged on the board mounting surface 6. The circuit board 12 has a mounting surface 12 a facing the board mounting surface 6. This mounting surface 12a
A large number of circuit components 13 such as an IC chip and a second connector 14 that is detachably connected to the first connector 8 are arranged in the. Second connector 14
Has a large number of pin holes 14a into which the pin terminals 8a are removably inserted, and contact terminals 14b with which the pin terminals 8a come into contact are arranged in each pin hole 14a. The magnetic disk device 1 and the circuit board 12 are electrically connected by the contact between the pin terminals 8a and the contact terminals 14b.

The circuit board 12 is mounted on the board mounting surface 6 at its four corners. Since the four mounting portions of the circuit board 12 have the same structure, only one of them will be described as a representative.

As shown in FIGS. 2 and 5, a disc-shaped seat portion 16 is integrally formed on the substrate mounting surface 6. The seat portion 16 is a seat surface 16 that is parallel to the board mounting surface 6.
The seating surface 16a is provided with a metal connecting projection 17 at the center thereof. The connecting protrusion 17 has a large diameter portion 1.
8 and a small-diameter portion 19 have a cylindrical shape, and the large-diameter portion 18 and the small-diameter portion 19 are coaxial with each other. A flange portion 20 that is superposed on the seat surface 16a is integrally formed at the end of the small diameter portion 19, and the small diameter portion 19 is
The connection projection 1 in cooperation with the large diameter portion 18 and the flange portion 20.
Groove 23 as an engaging portion continuous in the circumferential direction on the outer peripheral surface of 7.
Is formed. A shaft portion 21 is provided on the end surface of the flange portion 20 so as to project. The shaft portion 21 has a bearing surface 16a.
The connection projection 17 is fixed to the board mounting surface 6 by being press-fitted into the fitting hole 22 that is opened.

The method of fixing the connecting protrusion 17 to the seat portion 16 is not limited to the press-fitting as described above, but may be adhesion or soldering. On the other hand, on the mounting surface 12 a of the circuit board 12, a stopper member 25 made of synthetic resin is attached so as to face the connecting protrusion 17. As shown in FIG. 2B, the stopper member 25 includes a hollow cylindrical base 26 into which the large diameter portion 18 of the connecting protrusion 17 is detachably fitted. The base 26 is
The tip portion of the base 26 is fitted in a positioning hole 27 formed in the circuit board 12, and the fitting portion of the base 26 does not project to the surface 12b of the circuit board 12 opposite to the mounting surface 12a. It is located inside the positioning hole 27.

A disk-shaped flange portion 28 is integrally formed on the outer peripheral surface of the base 26. The flange portion 28 is
It is superposed on the mounting surface 12a of the circuit board 12, and the outer peripheral portion of the flange portion 28 is fixed to the mounting surface 12a by means such as adhesion or soldering.

At the center of the base 26, three locking arms 3 are provided.
0a, 30b, 30c are integrally projected. The locking arms 30a, 30b, 30c are continuous with the inner peripheral portion of the base 26 and are arranged at intervals in the circumferential direction. Then, as shown in FIG. 3, the locking arms 30a, 30b, 30c are each curved in an arc shape so as to contact the outer peripheral surface of the large-diameter portion 18, and the locking arms 30a, 30a, 30b
The large-diameter portion 18 is inserted into a portion surrounded by 30b and 30c.

An inwardly bent hook 31 is integrally formed at the tip of each of the engaging arms 30a, 30b, 30c. The hooking portion 31 has a claw portion 32 that contacts the outer peripheral surface of the small diameter portion 19 and a contact portion 33 that is in contact with the flange portion 20 and that is continuous with the claw portion 32. This hook 31 is
As described above, the large diameter portion 18 of the connecting protrusion 17 is attached to the locking arm 30.
When it is inserted between a, 30b and 30c, its claw portion 3
2 elastically fits into the groove 23, and the contact portion 3
3 abuts on the flange portion 20. As a result, the stopper member 25 is retained by the connecting projection 17 so as not to come off, and the circuit board 12 is supported on the board mounting surface 6 in a posture substantially parallel thereto.

In the state where the stopper member 25 is connected to the connecting protrusion 17 as described above, a gap corresponding to the protruding height of the connecting protrusion 17 is provided between the circuit board 12 and the board mounting surface 6. S is ensured, and the gap S is set to the minimum dimension capable of accommodating the circuit component 13 and the second connector 14 between the board mounting surface 6 and the circuit board 12.

In mounting the circuit board 12 on the board mounting surface 6 in the first embodiment having such a structure, first, the stopper member 25 and the connecting projection 17 are made to face each other.
The large diameter portion 18 of the connecting protrusion 17 is inserted between the locking arms 30a, 30b, 30c of the stop member 25. Then, the claw portion 32
Comes into contact with the outer peripheral surface of the large-diameter portion 18, and the locking arms 30a, 30
b and 30c are elastically deformed in the direction away from each other. Then, when the claw portion 32 passes through the large diameter portion 18, the locking arm 30
a, 30b, 30c are restored to their original shapes, and their claw portions 32
Elastically fits into the groove 23, and the contact portion 33 abuts the flange portion 20.

Therefore, the hook portion 31 is hooked on the connecting protrusion 17 and the stopper member 25 is fixed to the connecting protrusion 17 so as not to come off, so that the circuit board 12 can be attached to the housing 2 without using screws as in the prior art. it can.

In this case, the stopping member 25 hooked on the connecting projection 17 is fixed to the mounting surface 12a of the circuit board 12, and the connecting projection 17 and the stopping member 25 are connected to the circuit board 12 and the board mounting surface. Since it is inserted between the circuit board 6 and the connector 6, the connecting protrusion 17 and the stopper member 25 do not protrude or protrude from the surface 12b of the circuit board 12. As a result, the portion of the circuit board 12 fixed to the housing 2 becomes flat, and the overall thickness of the magnetic disk device 1 including the circuit board 12 can be reduced.

If the surface 12b of the circuit board 12 is flat, the distance S between the circuit board 12 and the board mounting surface 6 is set to a minimum dimension capable of accommodating the circuit component 13, and the distance S is equal to the distance S. Even if it is not possible to make it smaller than this, the overall thickness of the magnetic disk device 1 can be reduced.

Further, according to the above configuration, the circuit board 12
Is supported by the housing 2 by pushing the stopper member 25 into the connecting protrusion 17, it is possible to omit a troublesome and troublesome screwing operation, and the circuit board 12 can be efficiently attached. it can.

The present invention is not limited to the first embodiment described above, and FIGS. 6 and 7 show a second embodiment of the present invention. The second embodiment is different from the first embodiment mainly in the structure for preventing the circuit board 12 from coming off the board mounting surface 6, and the second embodiment is the same as the first embodiment. The same reference numerals are attached to the components of FIG.

As shown in FIG. 6, the main body 3 has a thick portion 41 continuous in the circumferential direction on the outer periphery of the end portion which is continuous with the substrate mounting surface 6. The thick portion 41 has a locking surface 42 that projects toward the outside of the main body 3 in cooperation with the peripheral surface of the main body 3.

A first connector 43 is attached to the circuit board 7 housed inside the housing 2. The first connector 43 includes a connector body 45 having a large number of pin terminals 44. Connector body 4
Reference numeral 5 has a protrusion 45 a that penetrates the through hole 9 and is protruded onto the substrate mounting surface 6. A flat first mating surface 46 that is parallel to the board mounting surface 6 is formed at the tip of the projecting portion 45 a, and the pin terminal 44 is arranged on the first mating surface 46.

A second connector 48 corresponding to the first connector 43 is attached to the mounting surface 12a of the circuit board 12. The second connector 48 has a number of pin holes 49.
And a connector body 50 having The connector body 50 has a flat second mating surface 51 that is parallel to the mounting surface 12a, and a pin hole 49 is formed in the mating surface 51. A contact terminal 52 into which the pin terminal 44 is detachably fitted is arranged in each pin hole 49. Then, the pin terminal 44 is inserted into the pin hole 49 until the first mating surface 46 of the connector body 45 contacts the second mating surface 51 of the connector body 50. By this insertion, the pin terminal 44 and the contact terminal 52
A fitting force for holding the circuit board 12 in the housing 2 is generated between the first and second mating surfaces 4 and
By abutting the 6, 52, a constant gap S is secured between the circuit board 12 and the board mounting surface 6. The gap S is set to a minimum dimension capable of accommodating the circuit component 13 between the circuit board 12 and the board mounting surface 6.

As shown in FIG. 6, locking members 53, which serve as locking means for being detachably hooked to the main body 3, are attached to the circuit board 12 at three positions on the periphery thereof. The locking member 53 includes a support piece 54 fixed to the mounting surface 12a of the circuit board 12 by means such as soldering or adhesion, and a locking piece 55 connected to the support piece 54. The locking piece 55 is integrally formed of a synthetic resin material. Therefore, the locking piece 55 is in a cantilever state with respect to the circuit board 12 and is elastically deformable,
A locking claw 56 is formed at the tip of the locking piece 55. The locking claw 56 is detachably hooked on the locking surface 42 of the main body 3 when the first connector 43 and the second connector 48 are connected as described above, whereby the circuit board 12 is housed. It is designed to be retained and retained in 2.

In the second embodiment having such a configuration, in order to mount the circuit board 12 on the housing 2, first, the circuit board 12 is positioned on the board mounting surface 6, and the first connector 43 and the second connector 43 are attached. 48 and 48 are opposed to each other. In this state, the circuit board 12 is pressed against the board mounting surface 6 and the pin terminals 44 are inserted into the pin holes 49 so that the first mating surface 46 and the second mating surface 51 are butted against each other. As a result, a fitting force is generated between the pin terminal 44 and the contact terminal 52, the circuit board 12 is held in the housing 2, and the distance S between the circuit board 12 and the board mounting surface 6 becomes a predetermined dimension. Determined. Further, at this time, the locking claw 56 at the tip of the locking member 53 is caught by the locking surface 42 on the housing 2 side, and holds the circuit board 12 with respect to the housing 2 while preventing it from coming off.

Therefore, according to the second embodiment, by engaging the locking claw 56 of the circuit board 12 with the locking surface 42 of the housing 2, the separation of the first connector 43 and the second connector 48 is prevented. Since the fitted state of these connectors 43 and 48 is maintained, the circuit board 12 can be attached to the housing 2 without using screws as in the prior art.

Since the locking member 53 hooked on the housing 2 is fixed to the mounting surface 12a of the circuit board 12, the locking member 53 is the surface 12b of the circuit board 12.
It does not stick out or stick out. From this,
The fixed portion of the circuit board 12 with the housing 2 becomes flat, and the magnetic disk device 1 including the circuit board 12
The overall wall thickness of can be reduced.

If the surface 12b of the circuit board 12 becomes flat, the distance S between the circuit board 12 and the board mounting surface 6 is set to the minimum dimension capable of accommodating the circuit component 13, and the distance S is set. Even if it is not possible to make it smaller than this, the overall thickness of the magnetic disk device 1 can be reduced.

Further, the circuit board 12 is simply pressed against the board mounting surface 6 so that the housing 2 can be pressed.
Since it is supported by, the troublesome and troublesome screwing work can be omitted, and the circuit board 12 can be efficiently attached by that much.

The magnetic recording apparatus according to the present invention is not limited to the one in which the hard magnetic recording medium is housed in the housing, but can be similarly implemented in the apparatus in which the floppy disk is housed.

[0050]

According to the structure described in claim 1, the stopper member of the circuit board is hooked on the locking portion on the outer surface,
Since this circuit board can be fixed to the housing so as not to come off, the circuit board can be attached to the housing without using screws as in the prior art. The fixed portion of the circuit board and the housing does not protrude or project on the surface of the circuit board opposite to the housing, and the surface is flat, so the entire device including the circuit board The thickness of can be reduced.

According to the second aspect of the present invention, the portion of the circuit board opposite to the housing, which is fixed to the housing, does not project onto the surface of the circuit board opposite to the housing. Even when the distance cannot be reduced further, the thickness of the entire device including the circuit board can be reduced, which further contributes to downsizing of the entire device.

According to the third aspect of the present invention, the circuit board is held in the housing by the fitting force between the first connector and the second connector, and the circuit board is locked before and after this fitting. Since the means is hooked on the housing and the fitting state of the connector is maintained, the circuit board can be attached to the housing without using screws as in the conventional case. At the same time, the fixed portion of the circuit board and the housing does not protrude or project on the surface of the circuit board opposite to the housing, and this surface becomes flat, so that the device including the circuit board The overall thickness can be reduced.

According to the structure described in claim 4, the circuit board is held in the housing by the fitting force generated in the fitting portion between the first connector and the second connector. It is possible to prevent the variation of the distance, and the mounting posture of the circuit board is stable.

According to the fifth aspect of the present invention, since the portion of the circuit board opposite to the housing on which the housing is fixed does not project and the surface is flat, the distance between the circuit board and the housing is reduced. Even if it cannot be made smaller than the above, the thickness of the entire device including the circuit board can be reduced, which further contributes to the compactification of the entire device.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic disk device according to a first embodiment of the invention.

FIG. 2A is a cross-sectional view showing a state in which a circuit board is mounted on a board mounting surface of a housing. FIG. 6B is a cross-sectional view showing a state in which the circuit board is attached to the board attachment surface of the housing.

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

FIG. 4 is a cross-sectional view in which a mounting portion of a circuit board is broken at a connector portion.

FIG. 5 is a perspective view showing the shapes of a connecting protrusion and a stopper member, respectively.

FIG. 6 is a perspective view of a magnetic disk device according to the first embodiment of the invention.

FIG. 7A is a cross-sectional view showing a state in which the circuit board is mounted on the board mounting surface of the housing. FIG. 6B is a cross-sectional view showing a state in which the circuit board is attached to the board attachment surface of the housing.

[Explanation of symbols]

 2 ... Housing 6 ... Outer surface (board mounting surface) 12 ... Circuit board 13 ... Circuit component 17 ... Projection (locking projection) 23 ... Locking part (concave groove) 25 ... Stopping member 31 ... Hooking part 43 ... First connector 48 ... Second connector 53 ... Locking means (locking member)

Claims (5)

[Claims] 1. A box-shaped housing having an outer surface for mounting a substrate, a circuit board mounted on the outer surface of the housing substantially parallel to the outer surface, and having circuit components mounted on the surfaces facing the outer surface. In the magnetic recording device including, a protrusion having an engaging portion is provided on the outer surface of the housing, and a stopper member corresponding to the protrusion is provided on the surface of the circuit board facing the outer surface. The stop member is releasably locked to the locking portion to prevent the circuit board from slipping out in a posture parallel to the outer surface and keep the distance between the circuit board and the outer surface constant. A magnetic recording device having a hooking portion for keeping the magnetic recording medium. 2. The structure according to claim 1, wherein the distance between the outer surface of the housing and the circuit board is set to a minimum dimension capable of accommodating the circuit component between the outer surface and the circuit board. A magnetic recording device characterized by: 3. A box-shaped housing having an outer surface for mounting a board, a first connector arranged on the outer surface of the housing, and a circuit board mounted on the outer surface of the housing substantially parallel to the outer surface. A magnetic recording device comprising: a second connector disposed on a surface of the circuit board that faces the outer surface, the second connector being removably fitted into the first connector; wherein the circuit board is the housing. A magnetic recording device, characterized in that a locking means is provided at a portion facing to the housing so as to be releasably hooked to the housing and hold the circuit board in a posture substantially parallel to the outer surface of the housing. 4. The method according to claim 3, wherein the first connector and the second connector are butted against each other to keep the distance between the outer surface of the housing and the circuit board constant. Magnetic recording device. 5. The circuit board according to claim 4, wherein the circuit board has a circuit component mounted on a surface facing the outer surface of the housing, and a distance between the circuit board and the outer surface is:
A magnetic recording device having a minimum size capable of accommodating the circuit component.