JPH06105531B2 - Recording or playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of the present application generally relates to a recording or reproducing apparatus, an electronic apparatus including the recording or reproducing apparatus, or improvements in various mechanisms suitable for these.

For example, in a magnetic disk recording or reproducing apparatus such as a floppy disk drive (FDD), a holder for accommodating a magnetic disk cassette is provided. Many of the holders are configured to be automatically lowered when the cassette is inserted to a predetermined position, so that the cassette is mounted at a predetermined recording or reproducing position.

By the way, for example, when it is attempted to feed the head carriage by a lead screw or the like driven by a step motor or the like, in order to guarantee the feeding position accuracy of the magnetic head on the magnetic disk, that is, so-called track accuracy, the motor and the screw It is necessary to adjust the mounting position. In addition to this, when the reference position (0 track position) of the head or head carriage is detected by a photocoupler or the like, it is also necessary to adjust the mounting position of the detector.

Conventionally, in order to adjust the position of this type of unit, a metal eccentric screw or pin is attached to the chassis substrate and the position is adjusted by this, but it is troublesome to attach such an eccentric screw or pin to the substrate. Particularly, in the case of the eccentric pin, the workability is further deteriorated because the eccentric pin must be attached to the substrate by caulking or the like while being adjustable and rotatable.

Of course, such a tendency is not limited to units such as a motor, a screw, and a detector, and is applicable to position adjustment for members that require various position adjustments.

Therefore, the invention of this application provides a recording or reproducing apparatus in which the attachment of the position adjusting member to the chassis substrate for the member requiring the position adjustment is significantly simplified, which can greatly contribute to automation and cost reduction. To aim.

In order to achieve the above object, after adjusting the position on the chassis substrate, an eccentric dowel for position adjustment with respect to a member to be fixedly attached is formed on the chassis substrate while being molded by outsert molding of a synthetic resin material. Adopted structure.

By doing so, since the eccentric dowel is attached to the chassis substrate while being molded by the outsert mold of synthetic resin material, the attachment of the eccentric dowel to the chassis substrate is remarkably simplified, and the automation can reduce the cost significantly. Can be realized.

The eccentric dowel allows the head carriage guide shaft pressing member and the outsert mold to be simultaneously formed and attached to the chassis substrate, which can significantly reduce the manufacturing cost of the device. become.

The above invention of this application, or the object of the invention other than the above,
The configuration, operational effects, and characteristic points will be apparent from the description of the embodiments below with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the invention of this application will be described with reference to the accompanying drawings.

FIGS. 4 (a) and 4 (b) show the front and back of a 3.5 "standard micro floppy disk, showing the state in which the shutter is open.

10 is a disk cartridge (abbreviation cassette),
Reference numeral a is a head window for contacting the medium 11 in the cassette and the drive-side magnetic head (not shown). 10b and 10b 'are reference holes for positioning the cassette in the drive, and 10c and 10c' are preliminary holes for other functions (for example, auto eject).

Reference numeral 11 is a recording medium (media), 12 is a metal hub for positioning and rotating the medium, and the medium and the metal hub are joined by a double-sided tape or an adhesive (not shown). The metal hub is provided with a spindle hole 12a and a drive pin hole 12b for receiving a power source on the drive side.

14, 15 (shown by broken lines) are reference drawings of the drive side motor spindle and the drive pin.

Reference numeral 10d is a shutter V groove, 10e is a shutter V groove angle, and 13 is a shutter.

FIG. 1 is an overall plan view of the embodiment apparatus.
Reference numeral 10 is a cassette, 20 is a cassette holder for holding the cassette 10, and 20a is a caulking leg formed by cutting and raising a part of the ceiling of the cassette holder 20, and two caulking legs form a pair. 21 is cassette 10
With a leaf spring for pressing the cassette which gives an appropriate pressure to the cassette holder 20, as shown in FIGS. 5 (a) and 5 (b), the two caulking legs 20a are tilted in the directions of arrows A and B to be placed on the cassette holder 20. It is fixed.

Reference numerals 22 and 22a respectively denote roller shafts that rotatably support the rollers 23 on the cassette holder 20. The two roller shafts 22 and 22a do not rub the springs 30 and 31 to the roller 23 as shown in FIG. Thus, the groove 22b is formed.

A shutter lever 24 and a latch 25 are rotatably attached with a shaft 26 fixed on the cassette holder 20 as a fulcrum. Details of the mounting portion are shown in FIG. A shutter spring 24b fixed to a spring hook 24a formed by cutting and raising a part of the cassette holder 20 at the other end is stretched around the shutter lever 24.

On the other hand, the latch 25 is a mold member, and the tip of the integrally molded thin piece 25b abuts a hook 25a formed by cutting and raising the cassette holder 20 and is bent in a bow shape.
A shutter pin 24c is provided on the lower surface of the tip of the shutter lever 24.

As shown in FIG. 8, a part of the cylindrical surface of the shutter pin 24c is a flat surface, and when the shutter 13 is completely opened, the shutter pin 24c does not completely enter the shutter V groove 10d. The groove angle 10e and the flat surface portion of the shutter pin 24c are in contact with each other.

At this time, the center of the shutter pin 24c is the end face 1 of the shutter 13.
The size of the shutter pin 24c is such that the shutter pin 24c does not come out of the shutter V groove 10d even when the shutter 13 is closed (in the direction of arrow D). In FIG. 8, the shutter pin 24c is biased in the direction of arrow C by the shutter spring 24b.

27 and 27 are side plates, and 28 is a U-shaped lift plate.

27a is a restriction tab formed by cutting and raising a part of the side plate, and prevents the spring 30 from being accidentally bent in the direction of arrow E in FIG. 9 and permanently deformed.

In FIG. 9, 40 is a spindle motor rotor, 41 is a rotor shaft, 42 is a spindle motor circuit board, 43 is a motor coil, and 44 is a hook for stopping the board, which is made of synthetic resin and is injection molded (out) to the chassis 1. Sart mold). Reference numeral 45 is a switch piece, 46 is a sleeve which is outsert-molded on the chassis 1, and 47 is a switch knob. An enlarged sectional view of these is shown in FIG. Switch knob
47 is pushed up by the spring force of the switch piece 45 and moves up and down according to the up and down movement of the cassette 10.

Although the above-mentioned members constitute a cassette detection switch, a write protect detection switch, an injection end detection switch and the like are also provided in the same configuration in addition to this.

In this embodiment, the three detection switches are the eleventh switch.
As shown in FIGS. (A) and (b), they are integrally configured.

That is, in the figure, the switch piece 45 has three arm portions 45a, 45b, 45c for each switch and is formed of a conductive elastic leaf spring, and the lower bent portions 45d, 45e at the center thereof are the tip ends. Is a claw part, which is inserted through a slit formed in the circuit board 42 and is bent on the back surface side so that the board 42
Mounted on the circuit and connected to ground on the circuit.

The arms 45a, 45b, 45c have contact points 45'a, 45'b, 45 ', respectively.
c, each of which has fixed contacts 42'a, 42'b,
Opposite 42'c. Further, knobs 47a, 47b, 47c are provided for the respective arm portions 45a, 45b, 45c. In FIG. 11 (b), 42a, 42b and 42c are signal line conductor patterns, and 42d is a ground conductor pattern.

In the above, the contacts 45'a-42'a, 45'b-42'b, 45 '
Each of the three switches is constituted by the c-42'c. Therefore, the knobs 47a, 47b, 47c move up and down depending on the presence / absence of the cassette, the presence / absence of the write protect, and the completion of the eject. The contact points are contacted or non-contacted.

FIG. 12 shows a main circuit including the above three switches. 80
a, 80b, 80c are pull-up resistors, 81a, 81b, 81c are capacitors, 82a, 82b, 82c are inverters, each switch is on,
OFF is a high and low signal for each inverter 82a, 82b, 82
It is output from c.

Returning to FIG. 1, 29 is a button for the operator to push out the loaded cassette and take it out. The button 29 is fixed to the lift plate 28, and its fixing method is shown in FIGS. 13 (a) and 13 (b). That is, at the same time as the groove 28a of the lift plate 28 is inserted into the groove of the ear 29a of the button 29, the convex portion 28b protruding from the lift plate 28 is also inserted into and combined with the meat relief groove 29b of the button 29. Figure 14 (a),
(B) is a modification of the method of attaching the operation button 29, in which the notch 29 formed in the button 29 in the window 28c instead of the protrusion 28b.
c is interleaved and connected.

On the other hand, in FIG. 1, reference numeral 32 is a molded eject lever, 32a is a thin piece integrally molded with the eject lever 32, and 32b is a protrusion formed on the chassis 1 to support the thin piece 32a. The eject lever 32 is rotatably supported by a shaft 32c formed on the chassis 1.

In FIG. 1, reference numeral 50 indicates a head carriage member including a magnetic head, a head pressing spring, a head carrier, 51 a head cable, and 52 a head carriage member 50.
Is a guide bar that serves as a sliding guide, 53, 53 are guide bar retainers for fixing the guide bar 52 to the chassis 1, 54,5
4 is a fixing screw for the guide bar retainer 53, 55 and 56 are 0 position stoppers of the carriage member 50 and their fixing screws, 57 and 58 are a track 0 detecting sensor and its fixing screw, and 59 is a mounting of the track 0 detecting sensor 57. Adjustment cams for adjusting and moving the position, 60 and 61 are step motors and their fixing screws, 62 is an eccentric dowel for adjusting and moving the mounting position of the step motor 60, 63 is a lead screw, 70 is an electric circuit board, 71 Is an I / O connector fixed on the electric circuit board 70, the details of which are as shown in FIG. That is, the connector pin 71a of the connector 70 is in an upright relationship with the substrate 70, and is downsized as compared with the case of the conventional lateral pin.

2 is a bezel, 3 and 4 are mounting members, both are chassis 1
It is fixed to.

Here, details of the bearing portion on the carriage member 50 side with respect to the carriage guide bar 52 will be described with reference to FIG.

The carriage member 50 has sliding parts 50a and 50b for the bar 52, and bearings 83 and 84 are provided on these parts. Here, when inserting the guide bar 52 into the bearings 83, 84 fitted to the sliding parts 50a, 50b, in order to eliminate the passage error between the bearings 83, 84, it is better than the guide bar 52 normally used in the initial stage. Insert a slightly thicker reference guide bar into the bearings 83 and 84. At this time, the bearing 84 is loosely press-fitted with reference to the bearing 83 that is press-fitted and fixed.
After passing through, and moving in a direction to reduce the error and positioning, the adhesive 85 is fixed to the sliding portion 50b.

Then, after the bearing 84 is completely fixed by the adhesive 85, the ordinary guide bar 52 is inserted and assembled, so that the bearings 83 and 84 having the same error condition are always obtained.

In order to enable the above adjustment, the sliding portion 50a is a cylinder portion having a circular hole, while the sliding portion 50b is
Is provided with a U-shaped hole.

In this embodiment, the resin functional member for positioning and holding the carriage guide bar 52 by outsert molding is formed.

Conventionally, an AlDC (aluminum die-cast) base or the like is secondarily processed, a guide bar is placed on a highly accurate portion, and it is screwed and fixed by a pressed thin spring plate.

According to this embodiment, the portion for holding and positioning the guide bar by outsert molding and the portion for pressing the guide bar can be machined in one shot, so secondary machining can be eliminated and parts can be reduced, resulting in a significant cost reduction. Became.

Next, the explanation will be given with reference to FIGS. 17 (a) to 17 (d).

FIG. 17 (a) is a diagram immediately after outsert molding.

Reference numeral 53 is a pressing member, and its shaft portion 53a is outsert-molded on the chassis 1 so as to be rotatable.

86 is a guide bar positioning and holding member, and a tap hole 87 is formed in the chassis 1 so as to face the guide bar positioning and holding member.

88 is a member fixing 86 to the chassis, and 89 is a screw.

FIG. 17 (b) is a sectional view taken along line (b)-(b) of FIG. 17 (a).

FIG. 17 (c) shows a state in which the guide bar 52 is fixed.

After holding the guide bar 52 on the holding member 86, the pressing member 53 is rotated, and the guide bar 52 is pressed by the force generated by the deflection of the tip of the pressing member 53.
53 is fixed by screws 89.

FIG. 17 (d) is a sectional view taken along line (d)-(d) of FIG. 17 (c), in which the height of the guide bar 52 is extended by the holding member 86.

The lateral position accuracy is obtained by the protruding edge 1b of the opening 1a of the chassis 1.

In this embodiment, the 0 position stopper of the carriage 50 is also formed by outsert molding, and adjustment is possible.

Conventionally, a separate member is used for the 0 position stopper, which causes problems in cost and assembly.

In this embodiment, by forming the 0 position stopper by outsert molding, adjustment can be simplified and cost can be reduced.

This will be described with reference to FIGS. 18 (a) and 18 (b).

As shown in FIG. 18 (a), an outsert-molded 0 position stopper 55 is rotatably attached to the chassis 1, and a long hole 55a is formed in a part thereof. 73
Is a tap hole formed in the chassis 1.

FIG. 18B shows a state in which the head carriage 50 is fixed as a 0 position stopper, and is adjusted by the long hole 55a. 56 is a screw for fixing the 0 position stopper.

In this embodiment, the position of the carriage drive step motor, the lead screw, and the track 00 detecting photocoupler is adjusted by outsert molding by an eccentric dowel formed on the base.

Conventionally, it was necessary to use a separate member or a jig for the above adjustment, and there was a problem in terms of cost and the like.

In the present embodiment, by forming the eccentric dowel by outsert molding, it is possible to simplify the adjustment and reduce the cost.

This will be described with reference to FIGS. 19 to 21.

FIG. 19A shows an eccentric dowel 62 formed on the chassis 1 by the outsert molding method. FIG. 19 (b) is a sectional view thereof.

FIG. 20 shows an example used for position adjustment of the carriage drive step motor 60 and the lead screw 63 in the front-rear direction. In the figure, 60 is a step motor, 74 is a pressed holder, 75 is an outsert-formed positioning dowel, and 63 is a lead screw.

FIG. 21 shows an example used for position adjustment of the track 00 detection photocoupler. In the figure, 66 is a photocoupler, 67 is a fixing screw, 68 is a positioning dowel, and 62 is an eccentric dowel.

Next, the disk drive motor will be described with reference to FIG.

In the figure, 91 is a rotor yoke, and a permanent magnet 92 is attached to the inside of the rotor yoke.

Reference numeral 93 is a printed circuit board on which a control circuit of a direct drive (DD) motor and a drive coil 94 are mounted.

Here, the chassis 1 is made of, for example, a silicon steel plate, and is also used as a stator yoke of the motor.

In this way, by using the stator yoke of the DD motor and the chassis of the FDD as well, it is possible to omit the step of mounting the DD motor and improve the position accuracy. Further, the simplification of the structure facilitates adaptation to automatic assembly.

Reference numeral 96 is a housing, 97 is a bearing, 98 is a flange, 99 is a rotary shaft, 101 is a cassette positioning pin attached to the stator / chassis 1, and 102 is a cassette height determining pin.

Next, the magnetic head assembly will be described with reference to FIGS.

In FIG. 23, reference numeral 50 denotes a head carriage member on which the zero-face head 112 is mounted, which is molded from a synthetic resin such as polycarbonate.

Reference numeral 113 denotes a head arm on which a one-sided head (not shown) is mounted, and the head arm 113 and the head carriage 50 have screws 115 through a leaf spring 114 integrated with the head arm 113.
Are linked by.

Reference numeral 116 is a spring mounting arm for mounting a head arm spring 118 to generate a force (head pressure) for pressing the 0-sided and 1-sided head against a medium which is a recording medium.

Further, 117 is a hook arm for hooking the spring mounting arm 116. The spring mounting arm 116 and the hook arm 117 are integrally formed with the head carriage 50.

The details are shown in FIGS. 24 (a) and 24 (b). Figure 24 (a)
Shows the state before the spring 118 is attached.

FIG. 24 (b) shows a state in which the spring 118 is attached.

In FIG. 24 (b), the head arm spring 118 is put in the spring mounting arm 116, and the hinge portion 1 is
Bend at 16a, slightly shift the hook arm 117 in the direction of arrow P, and hook it on the hook portion.

The hook arm 117 returns to its original state due to the elasticity of the molding material, so the spring mounting arm 116 is shown in FIG. 24 (b).
In this state, the head arm spring 118 will not come off.

In this way, the spring can be attached without using a separate member for supporting the spring as in the conventional case, which is excellent in workability and can greatly contribute to cost reduction.

Next, with reference to FIGS. 2 and 3, a cassette mounting / discharging operation in the apparatus having the above configuration will be described.

Each drawing is composed of a partial side view and a partial plan view thereof.
2 (a) and 2 (b) are in a cassette mounting waiting state, and the cassette 10 is slid in the direction of arrow G and inserted. The shutter lever 24, the latch 25, and the eject lever 32 are located at their original positions by the spring force.

When the cassette 10 is slid further, the shutter pin 24c
Latches against the shutter 13 and opens the shutter 13 in response to the rotating operation of the shutter lever 24 (direction of arrow H in FIG. 2 (c)), and the front end surface of the cassette 10 is formed on the lower surface of the latch 25. Abut on 25c.

Further, when the cassette 10 is slid, the latch 25 rotates in the direction of arrow I in FIG. 2 (c).

When the R portion at the tip of the latch 25 is disengaged from the corner portion 27b of the bent portion of the side plate 27, the force (arrow J) of the spring 31 (twisted counterclockwise in the drawing by the torsion torsion bar spring) causes the second movement. The cassette holder 20 slides in the direction of arrow K as shown in FIG.

The surface of the side plate 27 on which the roller 23 rolls is partially cut away, and when the cassette holder 20 slides and the roller 23 rolls to the cutout portion 27a, the cassette holder 20 now moves to the spring 3
The force of 1 lowers in the direction of arrow L.

At this time, since the cassette 10 is vertically restricted by the cassette holder 20, the cassette 10 is lowered together with the cassette holder 20 to complete the mounting operation of the cassette 10 (see FIG. 2 (e),
(F)).

On the other hand, to eject the cassette 10, the operator
When the lift plate 28 slides in the direction of the arrow M by pressing, the slope 28 formed on the lift plate 28
b contacts the roller 23 and pushes the roller 23 in the direction of arrow N (Figs. 2 (g) and 2 (h)).

When the lift plate 28 is further pressed, the tip 28c of the lift plate 28 contacts one arm of the eject lever 32, the sliding motion of the lift plate 28 is transmitted to the eject lever 32, and the eject lever 32 moves in the direction of arrow O. The cassette holder 20 rotates and is pushed by the tip of one arm of the eject lever 32, and the cassette holder 20 slides in the direction of arrow P (second
Figures (i), (j)).

The slide movement of the cassette guide 20 causes the tip R of the latch 25 to move.
When the portion reaches the position where it crosses over the corner 27b of the bent portion of the side plate 26, the latch 25 rotates in the direction of arrow Q by the spring force of the thin piece 25b, and even if the operator stops pushing the button, the cassette holder The spring 20 is locked by the force of the spring 31 so as not to slide (Fig. 2 (k), (l)).

On the other hand, the structure of the latch 25 is as shown in FIG.
The preliminary hole 10c 'of 10 is held by the latch hook portion 25d.

That is, when the tip of the cassette 10 does not contact the latch pin portion 25c, the latch hook portion 25d is in a position where it does not interfere with the side surface of the cassette 10 (Fig. 3 (a)).

When the latch 25 is pushed in the direction of the arrow R by being pushed by the cassette 10, the latch hook portion 25d enters the preliminary hole 10c 'and holds the cassette 10 (Fig. 3 (b)).

When ejecting, the latch 25 rotates in the direction opposite to the arrow R, so that the cassette 10 is freed. Therefore, the cassette 10 released from the latch 25 is slid in the direction of arrow T by the rotation operation (arrow S) of the shutter lever 24 urged by the shutter spring 24b, and the ejection operation is completed (see FIG. ), (L)).

The embodiments of the invention of this application are as described above.

As described above, according to the present invention, in the recording or reproducing apparatus in which the constituent members of the head moving means such as the head carriage driving mechanism and the reference track detecting sensor unit are fixed on the chassis substrate after the position adjustment. An eccentric dowel for adjusting the position of the constituent member at a predetermined position on the chassis substrate, and a shaft member that is supported on the substrate after the eccentric dowel is molded by an outsert mold, and the outsert Since it is configured to be movable with respect to the chassis substrate after molding and to operate the eccentric dowel to adjust the mounting position of the component member of the head moving means, it is possible to adjust the position of the member that requires position adjustment. The attachment of the eccentric dowel to the chassis substrate is remarkably simplified, which can greatly contribute to automation and cost reduction.

[Brief description of drawings]

FIG. 1 is an overall plan view of a floppy disk device to which the invention of this application is applied, and FIG.
(L) is an operation state diagram for explaining the loading and unloading operations of the cassette of the apparatus shown in FIG. 1, and FIGS. 3 (a) and 3 (b) are enlarged views of main parts for explaining the latching action, and FIG. a), (b)
Is a plan view and a bottom view showing the front and back of the magnetic disk cassette, and FIGS. 5 (a) and 5 (b) are partially enlarged cross-sectional views for explaining a method for attaching the cassette pressing leaf spring on the cassette holder. FIG. 7 is a partially enlarged sectional view showing details of a roller mounting portion on the side surface of the cassette holder, FIG. 7 is a partially enlarged sectional view showing details of a shutter lever and latch mounting portion on the cassette holder, and FIG. 8 is a shutter pin. FIG. 9 is a partial plan view showing the relationship between the cassette and the shutter in the shutter open state, FIG. 9 is a side view showing a main part of an upper side surface in FIG. 1, and FIG. 11A and 11B are a partially enlarged sectional view showing a plan view and a side view showing the mechanical structure of three integrated detection switches, and FIG. 12 includes the switch shown in FIG. Main circuit diagram, Figure 13 (a) , (B) are exploded perspective views for explaining the method of attaching the operation button and a sectional view in an attached state, and FIGS. 14 (a) and 14 (b) are exploded views for explaining another method of attaching the operation button. FIG. 15 is a perspective view and a sectional view in a mounted state, FIG. 15 is a perspective view showing details of the connector,
FIG. 16 is a partially enlarged perspective view showing details of the bearing portion of the carriage member, FIG. 17 (a) is a plan view of an essential part of the chassis, and FIG. 17 (b) is a diagram (b)-(a) of FIG. (b) line sectional view, (c) is a plan view of the main part of the chassis for explaining the mounting state of the carriage guide bar, (d) is a sectional view taken along line (d)-(d) of (c). Figures 18 (a) and 18 (b) are partially enlarged views for explaining the attachment adjustment of the 0 position stopper of the carriage to the chassis, and Figures 19 (a) and (b) are for position adjustment on the chassis. FIG. 20 is a plan view showing a position adjusting mechanism of a carriage drive step motor and a lead screw. FIG. 21 is a position adjusting mechanism of a head track 00 position detecting photocoupler. Plan view, FIG. 22 is a sectional view showing the structure of the disk drive motor, FIG. Overall perspective view of a magnetic head assembly, FIG. 24 (a), (b) is an explanatory diagram for explaining a method of mounting the head arm spring. 1 ... Chassis, 10 ... Cassette 20 ... Cassette holder 23 ... Roller, 24 ... Shutter lever 25 ... Latch, 27 ... Side plate 28 ... Lift plate 29 ... Button 32 ... Eject lever 44 ... Hook, 45 ... Switch piece 46 ... Sleeve, 47 … Switch knob 50… Head carriage member 52… Guide bar, 53… Pressing member 55… 0 position stopper 59… Sensor, 60… Step motor 63… Lead screw 83, 84… Bearing

Continuation of the front page (56) References Open 60-60708 (JP, U) Open 60-6011 (JP, U) Open 54-173611 (JP, U)

Claims (1)

[Claims] 1. A recording or reproducing apparatus in which constituent members of a head moving means such as a head carriage driving mechanism and a reference track detecting sensor unit are fixed on a chassis substrate after position adjustment, and a predetermined position on the chassis substrate. An eccentric dowel for adjusting the position of the constituent member and a shaft member that supports the eccentric dowel on the substrate after molding the eccentric dowel are formed by outsert molding, and the chassis substrate after the outsert molding is performed. The recording or reproducing apparatus is characterized in that it is movable, and the eccentric dowel is operated to adjust the mounting position of the constituent member of the head moving means.