JPH05234349A - Disk device - Google Patents

Abstract

PURPOSE:To facilitate the stabilization and laying out of transference by using a guide member to prevent a connection member comprising a fiexible printed circuit board from deviating from the normal locus when an optical head is transferred to the fixed side. CONSTITUTION:When an optical head 4 moves to the outermost circumference position from the innermost circumference position of a disk, a curvature part moves in a direction alpha without contacting a taper bent part 9a if a connection member comprising a flexible printed circuit board FPC 6 is normal. But when the FPC 6 having a folding or bending deformation caused during the production thereof bulges in the direction of the taper bent part 9a therebelow in transit, it FPC 6 abuts a protrusion of the bent part 9a to be guided in the normal direction alpha with a small friction resistance. This enables stable transference while reducing restraint on the locus of the connection member thereby enabling laying out with higher space efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic or optical disk device.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a peripheral portion of an optical head of an optical disk device. The disk 3 is mounted on the turntable 2a attached to the rotary shaft of the spindle motor 2 fixed on the chassis 1, and the two guide shafts (not shown) fixed on the chassis 1 are mounted with bearings therebetween. By the carriage 5 which is inserted and further mounts the optical head 4, the carriage 5 reciprocates in the radial direction (arrow direction) of the disk 3 so that the optical head 4 exchanges information with the disk 3. For example, a flexible printed circuit board (abbreviated as FPC) 6 as a flexible connecting member for exchanging electric signals between the optical head 4 and the fixed-side PCB 10 has one end fixed to the optical head 4 by soldering or the like. The other end is joined to the connector 11 mounted on the fixed side PCB 10. FPC above
Reference numeral 6 allows the optical head 4 to reciprocate by bending with a constant curvature between the rear end of the optical head 4 and the connector 11.

[0003]

However, in the structure as described above, when the optical head 4 is moved, particularly when the optical head 4 is moved from the inner circumference side to the outer circumference side, the locus of the FPC 6 is shown in FIG.
In addition, there is a possibility that it will deviate from the normal locus shown by the alternate long and short dash line and largely bend to the right as shown by the broken line in FIG. Especially FPC
No. 6 breaks or forms during the manufacturing process, and the habit causes the above-mentioned problems.

On the other hand, it is conceivable to lengthen the FPC 6 in order to stabilize the trajectory of the FPC 6.
There is a problem that the radius of curvature becomes large when the FPC 6 is bent.

Another solution is, for example, Shokai Sho 6
Some Japanese Patent No. 2-158698 attaches a member for guiding the FPC to the optical head to prevent the FPC from being displaced. However, in this method, since the guide member is attached to the system of the movable optical head, the weight of the optical head system is increased, and in some cases, it may cause partial resonance.

Therefore, an object of the present invention is to solve the above problems and to stably guide, for example, a flexible printed circuit board as a flexible connecting member without increasing the weight of the optical head system. It is an object of the present invention to provide an optical disk transfer mechanism for a disk-shaped medium recording / reproducing apparatus, which can realize the above-mentioned operation and can save space as a whole.

Further objects of the present invention will be described below. FIG. 5 is a plan view of an optical pickup transfer mechanism in a conventional disk device, and FIG. 6 is a side view thereof. Conventionally, a transfer device for an optical pickup has two guide shafts 21 and 2.
The optical pickup body 23 and the linear motor 24 are arranged between the two. Optical pickup body 23 and linear motor 2
Since there is a limit to the size reduction of 4, two guide shafts 2
There was a limit to reducing the distance between 1 and 22. If the distance between the guide shafts 21 and 22 is large, the optical pickup body 2
However, there is a drawback in that the carriage 26 on which No. 3 is mounted lacks in rigidity, the optical pickup resonates at a low frequency, and the transfer of the optical pickup becomes unstable. Further, if the carriage 26 is made thick in order to obtain the rigidity of the carriage 26, the entire driving device for the carriage 26 becomes large, which causes a problem in downsizing.

The present invention solves the above-mentioned drawbacks of the prior art by reducing the distance between the guide shafts to reduce the size and weight of the carriage, which in turn raises the resonance frequency of the optical pickup and reduces the drive transfer. An optical pickup transfer mechanism that can achieve stabilization is provided.

Further, the object of the present invention will be described. Conventionally, for detecting the position (moving distance) of the head, an encoder module 63 is attached to the chassis 60 side of the transfer mechanism for a carriage 53a equipped with a scale plate 61 having fine slits as shown in FIGS. ing. The scale plate 61 is inserted in the gap between the light emitting portion 63a and the light receiving portion 63b of the encoder module 63 so as to move together with the head in the direction a in FIG. 14 (the radial direction of the disk-shaped medium). Therefore, since the scale plate 61 moves integrally with the head, the encoder module 6
From 3, the number of pulses (generated by the slit of the scale) corresponding to the moving amount of the head is generated. In this way, the movement amount of the head, that is, the position is detected. In FIGS. 14 and 15, 62 is the scale plate 6
1 is a holding plate for fixing 1 to the carriage 53a.

However, in the above structure, since the scale plate having the slit is formed of a thin plate (thickness of about 0.05 mm), it is difficult to process the scale plate.
However, there is a drawback that it requires careful handling. Therefore, the present invention solves the above-mentioned drawbacks and provides a movement amount detection mechanism which is easy to handle.

[0011]

In order to achieve the above object, the present invention extends so as to deviate from the regular locus of the connecting member as it approaches the optical head side from the vicinity of the fixed side of the flexible connecting member. When the optical head is moved to the fixed side and the connecting member deviates from the regular trajectory, the guide member guides the original trajectory to return to the regular trajectory. .. That is, claim 1
According to another aspect of the present invention, there is provided an information recording / reproducing apparatus for reading or writing information, wherein an optical head is reciprocated by a drive means in a radial direction of a disk-shaped medium by an optical disc transfer mechanism of the optical head side. An optical head transfer mechanism comprising a flexible connecting member for transmitting and receiving an electric signal, both ends of which are connected to a fixed side, and configured to move the optical head while extending and bending the connecting member. A guide member for preventing the connection member from deviating from the normal trajectory is arranged in the vicinity of the extension / bending trajectory of the connection member.

According to a fourth aspect of the present invention, there is provided an optical pickup transfer mechanism, a carriage on which an optical pickup main body is mounted, two guide shafts for transferring and guiding the carriage in a radial direction of an optical disk, and a transfer driving force. In the optical pickup transfer mechanism including the linear motor, a guide shaft of one of the two guide shafts is used as a yoke of the linear motor, and a bearing member is incorporated in the bobbin of the linear motor to serve also as the yoke. One of the guide shafts is supported by the bearing member so that the carriage can be slidably transferred along the guide shaft to transfer the optical pickup body.

According to a fifth aspect of the present invention, there is provided a head movement amount detecting mechanism for an information recording / reproducing apparatus, wherein a carriage for mounting a magnetic head or an optical head for recording or reproducing information or the like on a disk-shaped medium is a disk-shaped medium. In the head movement amount detecting mechanism for detecting the movement amount of the head by the linear encoder when the transfer guide is performed in the radial direction, the linear encoder is magnetized with a fine pitch in the longitudinal direction of the outer peripheral portion of the shaft by using a magnetic material. The shaft provided with a scale for detecting the amount of movement of the head in the radial direction, and the carriage is fixed so as to be arranged at a position facing the shaft and the amount of movement relative to the scale. It is characterized by being equipped with a magnetic sensor for detecting by movement.

According to the invention of a head movement amount detecting mechanism of an information recording / reproducing apparatus in a sixth aspect, a carriage for mounting a magnetic head or an optical head for recording or reproducing information or the like on a disk-shaped medium is a disk-shaped medium. In a head movement amount detection mechanism that detects the movement amount of the head by a linear encoder when the transfer guide is performed in the radial direction of the linear encoder, the linear encoder has a black light-absorbing black with a fine pitch in the longitudinal direction on the outer peripheral portion of the shaft. A shaft provided with a scale for detecting the amount of movement of the head in the radial direction by applying paint, and the carriage is fixed to the carriage so as to face the shaft, and the amount of movement is relative to the scale. It is characterized by being equipped with a reflection type photo interrupter which is detected by.

[0015]

According to the configuration of the optical disc transfer mechanism of the disc-shaped medium recording / reproducing apparatus according to the present invention, the regular locus of the connecting member moves from the vicinity of the fixed side of the flexible connecting member toward the optical head side. When the optical head is moved to the fixed side and the connecting member is attempted to deviate from the regular locus due to the breaking of the connecting member, the guiding member is provided with the guide member that extends so as to be released. It is possible to guide the user to return to the regular trajectory. Therefore, even if the connecting member has a habit, it can be stably transferred, and the layout of the space of the connecting member can be reduced with less restrictions on the trajectory of the connecting member. Further, since the frictional resistance when the connection member comes into contact with the projection as the guide portion is extremely small in an abnormal state, it is possible to guide the connection member without causing fluctuation in the transfer load of the optical head.

According to the above structure of the optical pickup transfer mechanism of the present invention, since the bearing member is built in the bobbin of the linear motor, the guide shaft and the yoke of the linear motor can be used in common. The distance of the guide shaft of the book can be reduced. Therefore, the size and weight of the carriage can be reduced, the drive device for the carriage can be downsized, and the resonance frequency of the optical pickup can be increased, so that the transfer can be easily stabilized.

According to the above-mentioned structure of the head movement amount detecting mechanism according to the present invention, the function as the linear encoder is achieved by the magnetic sensor or the reflection type photo interrupter and the magnetic material or the black paint having the light absorbing property or the light absorbing property. Since it can be performed by the scale formed on the shaft by a certain black ceramic, it is not necessary to use a thin plate scale, and the handling becomes easy.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS.
It will be described in detail based on 7. (Optical disk transfer mechanism of disk-shaped medium recording / reproducing apparatus)
FIG. 1 is a bottom view of the main part of the disk device according to this embodiment. FIG. 2 is a main sectional view of FIG.

The carriage 5 on which the optical head 4 is mounted is fitted into the two guide shafts 7, 7 fixed to the chassis 1 via bearings (not shown), and the thrust of the linear motor 8 causes the carriage to move in the direction of the arrow. That is, the disk 3 is configured to be reciprocally linearly movable in the radial direction.

One end of the FPC 6 is soldered to the rear portion of the optical head 4 and also joined by a double-sided tape, and the other end of the FPC 6 is joined to the connector 11 mounted on the PCB 10. The PCB 10 is screwed to the chassis 1 via the bracket 9.

Next, the guide mechanism of the FPC 6 will be described. The bracket 9 is provided with a taper bending portion 9a at a position facing the FPC 6 so as to incline from the connector side to the right side in FIG. FPC of the taper bent portion 9a
As shown in FIG. 3 (A), a plurality of spherical projections 9b made of synthetic resin or metal are formed on the surface on the 6 side.
Even if C6 comes into contact with this surface, friction with the FPC 6 is reduced. The projection 9b has the best spherical surface, but may have another shape. Moreover, this FIG.
Instead of the taper bent portion 9a of (A), as shown in FIG. 3 (B), the taper bent portion 9a is made of polytetrafluoroethylene (PTFE) capable of reducing frictional resistance at the time of contact with the FPC 6. It may be the one to which the sliding tape 9c as the main component is attached.

According to the above-mentioned structure, the optical head 4 has the structure shown in FIG.
When transferring from the initial position indicated by the solid line (the innermost position of the disc) to the end position indicated by the alternate long and short dash line (the outermost position of the disc), an external force acts on the FPC 6, or the FPC 6 is broken or habited. If it does not happen,
The curved portion of the FPC 6 moves in the direction of arrow α without contacting the tapered bent portion 9a. However, FPC6
In addition, when the product is bent or has a habit during manufacture, the FPC 6 may bulge downward (to the right in FIG. 2), that is, toward the tapered bent portion 9a during transfer. At this time, FPC
6 is the direction of the normal trajectory of the FPC 6 (direction of arrow α) with a very small load (friction) by contacting the projection 9b of the tapered bending portion 9a.
Will be guided to. That is, the tapered bent portion 9a
2 extends from the connector side and is inclined to the right side in FIG. 2, so that when the FPC 6 bends to contact the tapered bending portion 9a and the FPC 6 is pushed toward the connector side, the FPC 6 is guided to the left side in FIG. 2, that is, the α direction. Works like.

The tapered bent portion 9a is connected to the bracket 9 at the connector side edge as shown in the figure, and is also connected to the bracket 9 at the other edge so as to incline similarly to the above. You may make it perform a function.

According to the above-described embodiment, the optical head 4 is provided with the taper bent portion 9a extending so as to deviate from the regular locus of the FPC 6 as it goes from the vicinity of the fixed side of the flexible FPC 6 toward the optical head side. When transferred to the fixed side, FPC
If the FPC 6 tries to deviate from the regular locus due to a bend in 6 or the like, the taper bending portion 9a can guide the FPC 6 to return to the original regular locus. Therefore, even if the FPC 6 has a habit or the like, the layout can be stably transferred, and the layout of the FPC 6 can be made space-efficient with less restriction on the trajectory. In addition, FP at the time of abnormality
Since the frictional resistance when C6 comes into contact with the projection 9b serving as the guide portion is extremely small, the FPC 6 can be guided without causing a change in the transfer load of the optical head 4.

(Optical Pickup Transfer Mechanism) FIG. 7 is a plan view of the optical pickup transfer mechanism of the disk device according to this embodiment, FIG. 8 is a side view thereof, and FIG. 9 is a linear motor 24.
A cross-sectional view of the bobbin 25 is shown.

In FIG. 7, 20 is a guide shaft, which is a yoke forming a magnetic path of the linear motor 24. As shown in the sectional view of FIG. 9, the bobbin 25 of the linear motor 24 is provided with linear ball bearings 27 and 28 at both ends of the bobbin 25, and a winding portion 29 is provided in a concave portion at the center of the bobbin 25. Reference numeral 26 is a carriage on which the optical pickup main body 23 is placed, and 30 is a bracket portion that supports a shaft 32 of a ball bearing 31 that rolls freely on the guide shaft 22, and is integrated with the carriage 26.

Reference numeral 33 is an objective lens of the optical pickup body 23, and 34 and 35 are magnets forming the linear motor 24. When an electric current is applied to the coil of the winding portion 29, a thrust force F is generated between the magnets 34 and 35 of the linear motor 24.
Occurs in the direction of the arrow in FIG. 7, and the optical pickup can be transported. At this time, one side of the optical pickup is a linear ball bearing 27, 2 built in the bobbin 25.
8, the ball bearing 31 rolls on the guide shaft 22 along the guide shaft 21 and on the other side, so that the ball bearing 31 is smoothly transferred in the direction of the thrust F.

According to the above-mentioned embodiment, since the bearings 27 and 28 are built in the bobbin 25 of the linear motor 24, the guide shaft 21 and the yoke of the linear motor 24 can be used in common. Guide shaft 2
The distance of 1,22 can be reduced. Therefore, the size and weight of the carriage 26 can be reduced, and the carriage 2
The drive device of 6 can be downsized, and the resonance frequency of the optical pickup can be increased, so that the transfer can be easily stabilized. In addition, since the member of the bobbin itself is used as the bearing of the bobbin 25, the bearing of another member is unnecessary, the linear motor 24 can be downsized, and the distance between the guide shafts 21 and 22 can be further reduced. it can. Further, if the oil-impregnated bearing is used as the bearing of the bobbin 25, the bobbin can be made smaller than that of the above-described embodiment, which is effective in downsizing the drive device. Further, instead of incorporating the bearings 27 and 28 in the bobbin 25, a synthetic resin having a self-lubricating property is used as a material of the bobbin 25 itself, so that the bobbin 25 itself is provided with a bearing to serve as a synthetic resin sliding bearing. If used, the bobbin can be made cheaper and smaller, which is effective for downsizing the drive device.

(Head movement amount detection mechanism) FIG. 10 is a plan view showing the optical head transfer system and the disk-shaped medium.
1 is a side view thereof. In the figure, reference numeral 51 indicates a disk-shaped medium (hereinafter referred to as a disk), and an optical head (hereinafter referred to as a head) 52 mounted on a carriage 53 faces below the medium. The carriage 53 is provided with two cylindrical bearings (metal bush or linear ball type) 54, 54 on one side and a radial bearing 55 on the other side.
By being provided, it is fitted and supported by the guide shafts 56 and 57. The carriage 53 is guided by a main guide shaft 57 fitted in a bearing 54, and is moved in the direction of arrow a in FIG. 10 by a driving source (not shown) (for example, a linear motor). As a result, the head 52 reads / writes information from / to the disk 51.

The detection of the head position in this embodiment is performed by combining the head movement amount (distance) with a magnetic sensor and a scale based on a magnetizing pattern. Specifically, the magnetic sensor including two magnetic resistance elements 59, 59 mounted on the carriage 53 via a bracket 58 and the main guide shaft 57 are arranged so as to face each other in the vicinity of the outer peripheral portion of the main guide shaft 57. The main guide shaft 57 is made of a metallic material having magnetism, and is magnetized in a ring-shaped pattern in the axial direction at a fine pitch on the outer peripheral portion as shown in FIG. The magnetizing pitch is, for example, 0.2 mm. The magnetic sensor is composed of two magnetoresistive elements 59, 59, each of which has a magnetization pattern of the main guide shaft 57.
The positional relationship is such that the phase is shifted by 90 ° with respect to the (pole). This is represented by A phase and B phase, respectively, as shown in FIG.

Next, the operation of the transfer amount detecting mechanism will be described. When the head 52 moves in the direction a in FIG. 10 together with the carriage 53, the magnetoresistive elements 59, 59 cross the magnetization pattern on the outer peripheral portion of the main guide shaft 57, whereby the A-phase, B-phase of the magnetoresistive elements 59, 59. An output as shown in FIG. 13 is generated in each phase. This waveform is formed according to the length of the magnetization pattern that the magnetoresistive elements 59, 59 cross, that is, the number of poles. A waveform with a 90 ° phase difference is formed between the A phase and the B phase, so signal processing from these two waveforms should be performed to detect the head movement amount with a resolution of 1/4 pitch, that is, 0.05 mm. You can

The above shaft is the guide shaft 5.
The shaft is not limited to one that also serves as 6, 5 and may be a shaft provided separately from the guide shaft. In addition, a black paint having a light absorbing property is applied to the outer peripheral portion of the shaft at a fine pitch in the longitudinal direction to form a scale, while the sensor is of a reflection type fixed to the carriage so as to face the guide shaft. It may be configured to be a photo interrupter. The outer circumference of the shaft is coated with a slit-like black ceramic such as Al ₂ O ₃ having a fine pitch in the longitudinal direction to form a scale, while the sensor is arranged so as to face the shaft. It may be configured as a reflection type photo interrupter fixed to the carriage.

According to the above-described embodiment, the function as a linear encoder can be achieved by the scale formed by the magnetoresistive element and the pattern magnetized on the guide shaft made of a magnetic material. Therefore, it is necessary to use a thin plate scale. Is eliminated and handling becomes easier. Further, the space for arranging the encoder module and the like becomes unnecessary, and the space occupied by the linear encoder for detecting the head position (movement amount) can be extremely reduced. In other words, in the conventional structure, since the scale plate and the encoder module are configured to detect the movement amount, the space occupied by the scale plate and the scale plate accompanying the movement of the head and the space loss due to the encoder module are large. There was a drawback that

(Protective Structure of Laser Diode for Emitting Light in Disk Device) FIG. 16 shows a conventional optical pickup transfer mechanism, in which 71 is a pickup body and 72 is a flexible printed wiring board (hereinafter abbreviated as FPC). There is a projecting portion 73 having a shorting land 74 in the portion, and the shorting land 74 is short-circuited with the solder 75. When releasing this short-circuited state, it was opened by cutting out as shown by the broken line 76. However, this method is inconvenient because once it is opened, it cannot be short-circuited again.

Therefore, in order to eliminate this inconvenience, FIG.
The protective structure of the laser diode (hereinafter abbreviated as LD) for light emission of the disk device according to this embodiment is shown in FIG. FIG. 17 is a perspective view of the pickup main body 71 as viewed from the back side, and FIG. 18 is a cross-sectional view of the short land 74 of the FPC 72. In FIG. 18, reference numeral 79 is a base film of FPC, 78 is a copper foil, and 77 is a cover having a peeling part in part for exposing the copper foil 78. Solder plating on the peeling part of the cover 77
By applying No. 5, the solder plating 75 is raised slightly above the cover 77.

Solder plating 75 on the short land 74
The metal foil 80 and the FPC holding member 81 and the FP.
By sandwiching between C72, short land 7
The solder plating 75 of No. 4 is short-circuited by the metal foil 80, and the above LD can be protected. The metal foil 80 may be simply removed to bring it into the open state. Metal foil 8
For 0, an aluminum wheel or the like which is easily available can be used. Reference numeral 82 designates the FPC pressing member 81 and the pickup main body 71.
It is a fixing screw that is fixed to.

According to the above-mentioned embodiment, since the protective structure of the laser diode is short-circuited by sandwiching the metal foil 80 with the FPC holding member 81, the metal foil 80 is short-circuited.
By inserting and removing, you can easily repeat the protection and release as many times as you like, and the soldering iron is not necessary and the work is easy.

19 and 20 show a modification of the embodiment shown in FIG. FIG. 19 shows a short state and FIG. 20 shows an open state. FIG. 21 shows the structure of the FPC pressing member 81. FP
The C-holding member 81 has an elongated hole 83 as a hole for the locking screw 82, and is movable in the direction of the arrow in FIG. FP
The C-holding member 81 has a conductive portion 84 (for example, metal plating) on the FPC side, and when the conductive portion 84 straddles the solder plating 75, 75 of the shorting land 74 as shown in FIG. As shown in FIG. 20, the member 81 is in the open state when the conductive portion 84 is applied only to one of the solder platings 75, 75 of the shorting land 74.

According to the above modification, the protective structure of the laser diode can realize the short state and the open state by simply sliding the FPC pressing member 81, so that protection and release can be easily repeated many times. In addition to the above, a soldering iron is not required and the work is easy.

(Voice coil twist structure) An example of a coil of the prior art is shown in FIGS. The wire 102 is wound around the bobbin 101 as shown in FIGS. The end of the line 102 is along the groove 101c formed in the pickup carriage grounding surface 101a of the bobbin 101, and the carragee pin 103 is formed along the groove 101c.
The boss 101b in which the boss 101b is embedded is also bent, and there, at the right angle in FIGS.
Carragee pin 1 along the groove 101d provided on the side surface of b
It comes to the root of 03. Then, the base of the carrageen pin 103 is twisted and soldered. This carrageen pin 103
FPC on the pickup carriage (not shown)
It is configured to be connected to a circuit board by soldering with the like. Line 1
Since 02 is in the groove 101c, it is not shorted by being sandwiched between the bobbin 101 and the grounding portion of the pickup carriage. Also, because it is in the groove 101d, the boss 101b
Even when the bobbin 101 is used as a positioning pin when the bobbin 101 is assembled to the pickup carriage,
Since it is inside the outer diameter of b, there is no short-circuit between the wire and the pickup carriage.

However, in practice, the line 102 is replaced by the groove 101.
c. It is difficult to fit in the groove 101d, and in particular, there is a problem in that the line 102 is easily lifted at a portion bent at a right angle, and the seek motor and the pickup carriage or the speed detection coil device and the pickup carriage are short-circuited.

Therefore, in the disk device according to the present embodiment, as shown in FIGS.
In a optical disk device having a voice coil type seek motor for transferring 04 to a target track and a speed detection coil device for detecting the speed of the pickup 104 to control the pickup 104, a carrageen pin for twisting a wire wound around a bobbin 110. 112 is provided on a surface other than the contact surface when the bobbin 110 is attached to the pickup. As shown in FIG. 24, a voice coil type seek motor coil 106, a seek motor magnetic circuit 107, a speed detecting device coil 108, and a speed detecting device magnetic circuit 109 are attached to a carriage 105 holding a pickup body 104. Both coils 106 and 108 are
It has the configuration shown in FIG. The end of the wire 111 wound around the bobbin 110 passes through the groove 110b of the bobbin and is twisted to the carragee pin 112 on the rear surface side of the mounting surface.
The coil is positioned and assembled by a positioning pin 110c provided on the bobbin mounting surface 110a. Since the wire 111 and the carragee pin 112 are on the back surface of the mounting surface 110a, there is no short circuit. Further, since it is not necessary to dig a groove to fill the wire 112, the assembling property is also improved.

According to the above-mentioned embodiment, since the carragee pin is provided on the back surface of the mounting surface, it is not necessary to provide a groove around the carragee pin to serve as a path for the line, and therefore the bobbin shape can be simplified. Further, it is not necessary to bond the wire to prevent it from floating.

A modification of the above embodiment is shown in FIGS. The carrageen pin 115 and the positioning boss 113b that embeds it are on the mounting surface 113a, and the boss 113b
A portion 113c having a diameter smaller than the positioning diameter and a vertical groove 113d are provided in the. Mounting surface 113a
A groove 113e through which the line 114 passes is provided in the. The end of the wire 114 wound around the bobbin 113 is formed in the groove 11
After passing through 3e, the boss 113b is wound several times around the small-diameter portion 113c, passed through the vertical groove 113d, and then peeled off at the base of the carragee pin 115 and soldered. Line 11
Since No. 4 is wound around the small-diameter portion 113c, it floats and does not protrude from the groove. Therefore, the seek motor and the pickup carriage or the speed detection coil device and the pickup carriage are not short-circuited.

According to the above modification, since the wire is always tensioned, it does not float, so that it is not necessary to bond it. Further, it is not necessary to separately provide the positioning pin.

[Brief description of drawings]

FIG. 1 is a bottom view of an optical disc transfer mechanism of a disc-shaped medium recording / reproducing device in a disc device according to an embodiment of the present invention.

2 is a cross-sectional view of the transfer mechanism of FIG.

3 (A) and 3 (B) are views showing an example of a guide member of the transfer mechanism of FIG. 2 and a modification thereof, respectively.

FIG. 4 is a view showing a conventional transfer mechanism.

FIG. 5 is a plan view of a conventional optical pickup transfer mechanism.

FIG. 6 is a side view of the transfer mechanism of FIG.

FIG. 7 is a plan view of an optical pickup transfer mechanism of a disk device according to an embodiment of the present invention.

8 is a side view of the transfer mechanism of FIG. 7. FIG.

9 is a cross-sectional view of the transfer mechanism of FIG.

FIG. 10 is a plan view of the head movement amount detection mechanism of the disk device according to the embodiment of the present invention.

11 is a side view of the movement amount detection mechanism of FIG.

12 is a partially enlarged view of the guide shaft of FIG.

13 is a diagram showing a waveform of a pulse generated in the movement amount detection mechanism of FIG.

FIG. 14 is a plan view of a conventional head movement amount detection mechanism.

15 is a side view of the movement amount detection mechanism of FIG.

FIG. 16 is a perspective view of a conventional optical pickup transfer mechanism.

FIG. 17 is a perspective view showing a protective structure of a light emitting laser diode of a disk device according to an embodiment of the present invention.

FIG. 18 is a cross-sectional view of an FPC shorting land.

FIG. 19 is a side view of a laser diode protection structure showing a short-circuit state in a modification of the embodiment of FIG.

20 is a side view showing the protection structure of FIG. 19 in an open state. FIG.

21 is a perspective view of an FPC pressing member in the protection structure of FIG.

FIG. 22 is a perspective view showing a conventional voice coil.

FIG. 23 is an enlarged perspective view of the main part of FIG. 22.

FIG. 24 is a diagram of an optical disk device that employs a voice coil twisting structure according to an embodiment of the present invention.

FIG. 25 is a perspective view of the voice coil of FIG. 24.

FIG. 26 is a perspective view of a voice coil showing a modified example of the embodiment shown in FIG. 25.

27 is an enlarged perspective view of the main part of FIG. 26. FIG.

[Explanation of symbols]

1 ... Chassis, 2 ... Spindle motor, 3 ... Disc,
4 ... Optical head, 5 ... Carriage, 6 ... FPC, 7 ... Guide shaft, 8 ... Linear motor, 9 ... Bracket, 9a
... Tapered bending part, 9b ... Protrusion, 9c ... Sliding tape, 10
... PCB, 11 ... Connector, 12 ... Gap. 20, 21,
22 ... Guide shaft, 23 ... Optical pickup body, 2
4 ... Linear motor, 25 ... Bobbin, 26 ... Carriage,
27, 28 ... Ball bearing, 29 ... Winding part, 33 ...
Objective lens, 34, 35 ... Magnet. 51 ... Disk, 52 ... Optical head, 53, 53a ... Carriage, 54
... Cylindrical bearing, 55 ... Radial bearing, 56, 57 ... Guide shaft, 59 ... Magnetoresistive element, 60 ... Chassis, 6
1 ... Scale board, 62 ... Holding board, 63 ... Encoder module. 71 ... Pickup body, 72 ... FPC, 7
4 ... Short land, 75 ... Solder, 76 ... Dashed line, 7
7 ... Cover, 78 ... Copper foil, 79 ... Base film, 80
... metal foil, 81 ... FPC holding member, 82 ... stop screw. 1
01c, 101d ... Groove, 102 ... Line, 104 ... Pickup body, 105 ... Carriage, 106 ... Seek motor oil, 107 ... Seek motor magnetic circuit, 108 ... Speed detection device coil, 109 ... Speed detection device magnetic circuit, 11
0 ... bobbin, 110a ... bobbin mounting surface, 110b ... groove,
110c ... positioning pin, 111 ... line, 112 ... carrage pin, 113a ... mounting surface, 113b ... positioning boss, 1
13d, 113e ... Groove, 114 ... Line, 115 ... Carrage pin.

Claims (6)

[Claims] 1. An information recording / reproducing apparatus for reciprocally moving an optical head in a radial direction of a disk-shaped medium by a driving means to read or write information, both ends of which are connected to an optical head side and a fixed side, respectively. An optical head transfer mechanism, comprising a flexible connecting member for transmitting and receiving an electric signal, configured to move the optical head while extending and bending the connecting member, in the vicinity of an extension / bending locus of the connecting member. An optical disk transfer mechanism for a disk-shaped medium recording / reproducing apparatus, characterized in that a guide member for preventing the connecting member from deviating from a normal trajectory is arranged in the. 2. The guide member extends from the vicinity of the fixed side of the connecting member, and inclines so as to deviate from the normal trajectory of the connecting member toward the optical head side. An optical disk transfer mechanism of the disk-shaped medium recording / reproducing apparatus according to claim 1. 3. The optical disk transfer mechanism for a disk-shaped medium recording / reproducing apparatus according to claim 1, wherein the guide member has a plurality of hemispherical projections on a sliding portion with respect to the connecting member. 4. An optical pickup transfer mechanism comprising a carriage on which an optical pickup main body is mounted, two guide shafts for transferring and guiding the carriage in a radial direction of an optical disk, and a linear motor for generating a transfer driving force. One guide shaft of the two guide shafts is used as the yoke of the linear motor, a bearing member is built in the bobbin of the linear motor, and one guide shaft that also serves as the yoke is supported by the bearing member. An optical pickup transfer mechanism, wherein the carriage is slidably transferred along the guide shaft to transfer the optical pickup body. 5. A linear encoder detects a moving amount of the head when a carriage for mounting a magnetic head or an optical head for recording or reproducing information on a disk-shaped medium is guided in the radial direction of the disk-shaped medium. In the head movement amount detecting mechanism, the linear encoder includes a scale for detecting the movement amount in the radial direction of the head by magnetizing the shaft with a fine pitch in the longitudinal direction of the outer peripheral portion of the shaft using a magnetic material. And a magnetic sensor that is fixed to the carriage so as to be arranged at a position facing the shaft and that detects the movement amount by relative movement with the scale. Head movement amount detection mechanism of recording / reproducing apparatus. 6. A linear encoder detects the amount of movement of the head when a carriage carrying a magnetic head or an optical head for recording or reproducing information on or from a disk-shaped medium is guided in the radial direction of the disk-shaped medium. In the head movement amount detection mechanism, the linear encoder is a scale for detecting the movement amount in the radial direction of the head by applying black paint having light absorption at a fine pitch in the longitudinal direction on the outer peripheral portion of the shaft. And a reflection type photo interrupter which is fixed to the carriage so as to face the shaft and detects the movement amount by relative movement with a scale. A head movement amount detection mechanism for an information recording / reproducing apparatus.