JPH03268278A - Pickup guiding device - Google Patents

Abstract

PURPOSE:To improve the position regulating accuracy of a pickup by guiding the pickup with the aid of a guiding bar which is in parallel with the principal plane of a chassis and the plate part of the chassis interposed by the guiding groove of the pickup. CONSTITUTION:The pickup 5 for a recording medium 3 placed on a turntable and turned is moved in the radial direction of the medium 3 with a guide shaft 2, which is axially supported by the chassis 1 in parallel with the principal plane of the chassis 1, as a guide. On the other hand, the plate part 1c of the chassis 1 is interposed by the groove part formed by the other ends 5a and 5b of the pickup 5 and the position of the pickup 5 is regulated. By such constitution, a pickup guiding device that the turning with the shaft 2 as a center is prevented from occurring and the positional accuracy is improved in comparison with a case that only the guiding bar is used is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pickup guide device, and particularly to a pickup guide device for reproducing signals recorded on a disk or recording signals on a disk in a magneto-optical disk device or the like. This invention relates to a pickup guide device that guides feeding.

[Prior Art] This type of pickup guide device that has been commonly used in the past is shown in FIGS. 14 and 15. FIG. 14 is a plan view showing a conventional pickup guide device, and FIG. 15 is a front view thereof.

The chassis 201 is formed by pressing a thin sheet metal and then performing outsert molding. This chassis 201 has an escape hole 2 located approximately in the center thereof, which corresponds to arrow C of the pickup 206 and the reciprocating movement in the direction indicated by the arrow.
01e is provided. Regulating pieces 201C for restricting movement of the two guide shafts 202 in the directions indicated by arrows A and B are outsert molded at four positions near the left and right opposing ends of the escape hole 201e. is formed by. The guide shaft 202 is assembled by tightening the screw 203 in the direction indicated by the arrow in FIG. The two guide shafts 202 are assembled by being inserted into guide holes 206a provided in the pickup 206.

A disk 207 as a recording medium placed on the turntable 204 is rotated by rotationally driving the turntable 204 by a spindle motor 205 . Recording surface 207a of disk 207 and pickup 20
The pickup 206 is guided reciprocally by sliding along the guide shaft 202 in the direction indicated by the arrow CD so that the distance between the pickup 206 and the objective lens 206b of the pickup 6 is kept constant. At this time, the distance from the surface 201a of the chassis 201 to the recording surface 207a of the disk 207 is kept constant. In addition, the guide shaft 202
is placed on and fixed on the surface 201a of the chassis 201. The pickup 206 has a guide hole 206
It is supported by a guide shaft 202 inserted into a. Therefore, the objective lens 206b and the recording surface 2
Pickup 2 so as to keep the distance between it and 07a constant.
Assembling the 06 is easy. That is, the turntable 20, which is a means for regulating the placement of the disk 207,
4 and the guide shaft 202, which is a guide means for the pickup 206, are located on the surface 201a of the same chassis 201.
By being attached above, variations in dimensional accuracy between the disk 207 and the pickup 206 can be suppressed.

[Problems to be Solved by the Invention] However, the movement of the two guide shafts 202 in the directions shown by arrows A and B is restricted by the restriction pieces 201c provided at both ends of the chassis 201.
Fixed. The guide shafts 202 are attached to the chassis 201 so that the axes of the two guide shafts 202 are parallel to each other.
Needs to be fixed on top. Therefore, chassis 201
The four regulating pieces 201c provided on the surface 201a of
It needs to be processed with high precision. However, accurately machining the individually isolated regulating pieces 201c into the chassis 201 is accompanied by the difficulty of having to strictly control the dimensions during press working. therefore,
It has been difficult to fix the two guide shafts 202 to the chassis 201 with high precision so that their axes are parallel. As a result, there is a problem in that the position of the pickup guided along the guide shaft becomes unstable.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to improve and stabilize the accuracy of regulating the position of the pickup.

[Means for Solving the Problems] A pickup guiding device according to one aspect of the present invention is a device for guiding the feeding of a pickup in order to perform recording and reproduction on a recording medium placed on a turntable. , a plate portion, a guide shaft, and a pickup body. The plate portion has a main surface and an edge extending along the pick-up sending direction and having a surface substantially parallel to the main surface. The guide shaft is
It extends along the direction in which the pickup is sent and is fixed to the plate portion so that its axis is substantially parallel to the main surface. The pickup body has a guide groove formed to hold the edge, and a through hole into which the guide shaft can be inserted.

A pickup guide device according to another aspect of the invention includes a plate portion, a guide shaft, a protruding portion, a screw, and a pickup body.

The plate portion has a main surface and an edge extending along the pick-up sending direction and having a surface substantially parallel to the main surface. The guide shaft is arranged to extend along the direction in which the pickup is sent, and its both ends are placed in contact with the main surface of the plate portion. The protruding portion protrudes from the main surface of the plate portion and is provided so as to abut both ends of the guide shaft in a direction intersecting the direction in which the pickup is sent. The screw is provided at a position opposite to the protruding portion with the guide shaft interposed therebetween, and is for fixing the guide shaft on the main surface of the plate portion. This screw has a flange, and the outer end of the flange abuts the outer peripheral surface of the guide shaft. The pickup body has a guide groove formed to hold the edge, and a through hole into which the guide shaft can be inserted.

[Operation] In the pickup guide device according to one aspect of the present invention, the pickup is guided along the direction in which the guide shaft and the edge portion extend. The edge is formed with a surface substantially parallel to the major surface of the plate portion. Further, the guide groove formed in the pickup body holds the edges.

The guide shaft is arranged so that its axis is substantially parallel to the main surface of the plate portion, and can be inserted into the through hole of the pickup body. In this way, the guide shaft that guides the feeding of the pickup and the edge are provided so that they both lie on parallel extended planes. Therefore, the regulation accuracy of the height position of the pickup with respect to the disk can be improved and stabilized, and by simply fixing one guide shaft to the plate part with high precision, the position of the pickup when guiding the pickup can be raised to a high position. It becomes possible to regulate accurately and stably.

In the pickup guide device according to another aspect of the invention, both ends of the guide shaft are supported in pressure contact with the main surface of the plate portion by fastening the screws. At this time, since both ends of the guide shaft are in contact with the protruding portions provided on the main surface of the plate portion, the guide shaft is also supported in pressure contact in a direction intersecting the feeding direction of the pickup. Therefore, it is possible to regulate the position of the guide shaft without creating any play in two directions: the direction in which it contacts the main surface of the plate portion, and the direction that intersects the direction in which the pickup is sent. Thereby, the position of the guide shaft relative to the plate portion is regulated with high precision.

Embodiment FIG. 1 is a plan view showing an embodiment of a pickup guide device according to one aspect of the present invention.

FIG. 2 is a side sectional view showing a cross section taken along the line ■-■ in FIG. FIG. 3 is a front view showing the pickup guide device corresponding to FIG. 1.

Referring to these figures, the disk 6 is placed on the turntable 3, and the turntable 3 and the spindle motor 4 are connected to each other.
By integrating the spindle motor 4
The disk 6 rotates due to the rotation. The guide shaft 2 is inserted into the guide hole 5C of the pickup 5.

Both ends 2a and 2b of the guide shaft 2 are fixedly supported on the plane of the chassis 1 by support parts 1a and lb, respectively. As a result, the pickup 5 slides in the direction of arrow CD and is guided in a reciprocating manner.

The guide parts 5a and 5b sandwich the guiding flat part IC so that a slight gap exists with respect to the thickness of the chassis 1.

Thereby, the lower surface of the guide portion 5a is always in contact with the surface of the guide flat portion IC. In other words, the lower surface of the guide portion 5a of the pickup 5 acts as a guide according to the moment due to its own weight in the tangential direction with the guide hole 5C of the pickup 5 as a fulcrum, that is, in the rotational direction indicated by the arrow F with the guide hole 5C as the center. Flat part IC
always in contact with the surface.

In this way, the pickup 5 maintains a constant mounting position with respect to the chassis 10 while the feed drive mechanism (
(not shown), it is reciprocated in the direction of arrow CD according to the driving force of a motor or the like within the drive mechanism. That is, the disk 6 placed on the turntable 3 is rotated by the rotation of the spindle motor 4, and the pickup 5 is reciprocated in the direction of arrow CD in parallel to the recording surface of the disk 6.
Reproduction or recording on the disc 6 is performed according to predetermined operations.

In FIG. 1, a spin motor 4 integrated with a turntable 3 is supported and fixed to a chassis 1. Further, the guide means of the pickup 5, that is, the guide shaft 2 and the guide plane IC are arranged on the same extended plane of the chassis 1, respectively. Therefore, if the overall flatness of the chassis 1 is accurate, the turntable 3
The relative position accuracy of the pickup 5 with respect to the pickup 5 can be easily ensured.

Configuration 1 of the pickup guide device shown in FIG. 1 can be employed in a CD player or the like that is intended for relatively small-diameter discs. LD players and the like with large-diameter discs are generally provided with a tilting device necessary for adjusting the optical axis of the pickup to correspond to the warpage of the disc. An embodiment of a pickup guide device intended for such a large-diameter disk is shown in FIGS. 4 to 6.

FIG. 4 is a plan view showing an embodiment of a pickup guide device for a large-diameter disk. FIG. 5 is a side sectional view showing a cross section taken along the line V--V in FIG. 4.

FIG. 6 is a front view showing the pickup guide device corresponding to FIG. 4. Referring to these figures, the fulcrum shafts lie and lld of the tilt plate 11 are inserted into fulcrum support holes 16a and 16b on the chassis 16, respectively. Thereby, the tilt plate 11 is connected to the chassis 16 so as to be rotatable in the direction of force indicated by the arrow IJ in FIG. This tilt plate 11 includes a pickup 1 as well as the chassis 1 in FIG.
Each of them is equipped with 5 guiding means. The reference numeral 2 corresponding to each guide means in the pickup guide device of FIG. 1 is given in FIGS. 4 to 6. The tilt plate 11 is connected to a tilt drive mechanism (not shown) and is rotated in the direction of arrow IJ according to the driving force of a motor or the like within the drive mechanism.

This allows the optical axis of the pickup 15 to be adjusted in inclination in accordance with the warpage of the disk 16. Note that the spindle motor 14 is fixedly supported by the chassis 16 regardless of the rotation of the tilt plate 11.

Therefore, the pickup guide device according to one aspect of the present invention includes a mounting surface that abuts and supports both ends of the guide shaft that guides the pickup, and a mounting surface that is inside the pickup and uses the guide shaft as a fulcrum. a guide surface that comes into contact with and guides the guide section that restricts the tilt of the pickup in the tangential direction;
The chassis 1 in the figure and the tilt plate 11 in FIG. 4 exist on the same extended plane. This makes positional regulation of the pickup with respect to the chassis or tilt plate highly accurate and stable. In particular, in the embodiment shown in FIG. 3, if the chassis that supports and fixes the spindle motor and the tilt plate that supports and regulates the guide of the pickup are connected as separate parts, at least the connected portion This has the possibility of adversely affecting the relative positional accuracy between the spindle motor (turntable) and the pickup. Therefore, it is necessary to more simply regulate the position between the tilt plate and the pickup. Therefore, the pickup guide device of the present invention is effective when the chassis and the tilt plate are connected as separate parts.

7 is a plan view showing in detail a method of fixing the guide shaft to the chassis in the pickup guide device shown in FIG. 1. FIG. FIG. 8 is a side sectional view showing a cross section taken along the line ■-■ in FIG.

FIG. 9 is a front view showing the pickup guide device corresponding to FIG. 7. An example of a method for fixing a guide shaft to a chassis will be described with reference to these figures.

4. The chassis 21 is formed by pressing a thin sheet metal. The chassis 21 is provided with an escape hole 21a substantially in the center so as to accommodate the reciprocating movement of the pickup 26 in the direction of arrow CD. A regulating piece 21 for regulating the position of the guide shaft 22 in the arrow AB force direction is provided on the left and right opposing end surfaces of the escape hole 21a.
b, 21C are provided. At both ends of the guide shaft 22, screw holes 21d and 21e for mounting screws 23 are provided. The guide shaft 22 is inserted between the regulating pieces 21b and 21c of the chassis 21, and is tightened into the screw holes 21d and 21e of the chassis 21 in the direction indicated by the arrow in FIG.
Attached to 1.

However, in the above device, the regulation dimension corresponding to the outer diameter of the guide shaft 22 between the regulation pieces 21b and 21c of the chassis 21 must be at least equal to or larger than the outer diameter of the guide shaft 22 when the guide shaft 22 is inserted. Work becomes difficult. 5. Therefore, the guide shaft 22 and the regulating piece 21b are inevitably
, 21c, play occurs in the direction shown by arrow AB in FIG. Under such conditions, the guide shaft 22 is finally attached to the chassis 21 by tightening the mounting screw 23, with the amount of play in the direction indicated by the arrow AB being inconsistent.

As shown in FIG. 7, regulating pieces 21b and 21c of the chassis 21 are provided at positions facing each other in the left and right directions near both ends of the guide shaft 22. As shown in FIG. Therefore, either a deviation corresponding to the amount of play occurs at both ends of the guide shaft 22 in the force direction of the arrow AB, or a deviation of the guide shaft 22 occurs in the opposite direction. This causes a problem in that the guide shaft 22 is mounted obliquely with respect to the reference mounting axis of the guide shaft 22.

As a means to solve this problem, at the time of inserting the guide shaft 22 into the chassis 21, after regulating the guide shaft 22 to the reference position using a jig or the like in the above 6.
It is conceivable to fasten and fix it by 3.

However, the guide shaft 22 is supported only by the frictional force at the contact point between the flange 23a of the mounting screw 23 and the guide shaft 22 which is sandwiched between the flange 23a and the chassis 21. Therefore, for example, when an impact such as a fall is applied to the guide shaft 22, the guide shaft 22 can be reliably and reliably
2 cannot be guaranteed to be fixed to the chassis 21. Further, since jigs and tools are required for the installation work, work loss also occurs.

Therefore, a pickup guide device having a guide shaft fixing means configured to solve the above-mentioned problems is shown in FIGS. 10 to 12. FIG. 10 is a plan view showing another embodiment of the method of fixing the guide shaft;
FIG. 1 is a right side view thereof, and FIG. 12 is a front view thereof. FIG. 13 is a side view showing in detail the method of fixing the guide shaft.

Referring to these figures, fix the guide shaft 32. Explain about orthotropy.

A disk 37 is placed on the turntable 34 as in the above embodiment. Since the turntable 34 and the spindle motor 35 are integrated, the disk 37 is rotated by the rotation of the spindle motor 35. Since the pickup 36 is connected to a feed drive mechanism (not shown), the pickup 36 is guided by the drive force along the guide shaft 32 attached to the chassis 31 and reciprocates in the direction of arrow CD. That is, turntable 3
4 is rotated by the rotation of the spindle motor 35, and the pickup 36 reciprocates in the direction of the arrow CD parallel to the recording surface of the disk 37, so that the disk 37 is rotated according to a predetermined operation of the pickup 36.
is reproduced or recorded on the disc 37.

The turntable 34 and the spindle motor 35 are attached in advance using screws or the like (not shown) so that their axes are perpendicular to the plane of the chassis 31. A hole 31a is provided in the chassis 31 to allow the pickup 36 to move in the direction of arrow CD. Bent pieces 31b, which are bent in the direction indicated by the arrow in the chassis 31, are provided at both left and right opposite ends of the hole 31a.

31c are provided so as to face each other on the left and right.

Near the bent pieces 31b and 31c of the chassis 31, there are tap holes 31d and 31e on the left and right, and protruding pieces 31f and 31g.
Further, other bent pieces 31h and 31i are provided which are bent in the same direction as the bent pieces 31b and 31c, respectively.

On the other hand, the pickup 36 has its guide portions 36a, 36
b is positioned with the linear end surface 31j on the chassis 31 sandwiched between it and the thick plate of the chassis 1 with a slight gap. The guide shaft 32 is inserted into the guide hole 36c of the pickup 36. Both ends of the guide shaft 32 are connected to protruding pieces 31f and 3 on the chassis 31.
1g and between the bent pieces 31b and 31c.
It is placed on the plane of the chassis 31 so as to be in contact with the side surface 31 in the BN direction. In this manner, the reciprocating movement of the pickup 36 in the direction of arrow CD is guided along the guide shaft 32.

Next, a method for regulating the position of the guide shaft 32 with respect to the chassis 31 will be explained.

Referring to FIG. 13, the guide shaft 32 has an outer peripheral surface 3xk on the side surface of the bent pieces 31b and 31c of the chassis 31.
, 31fL and the flat portion 31m of the chassis 31 are placed in contact with each other. The screw 33 is the tapped hole 31 of the chassis 31.
d and 31e in the direction indicated by arrow M. As a result, the outer peripheral end of the flange 33a of the screw 33 and the guide shaft 32 come into contact at the contact point 32a. At this time, the fastening position of the screw 33 is set such that the contact point 32a is located at a position with a dimension Q that is less than the radius of the guide shaft 32 in the direction shown by the arrow O from the central axis 32b of the guide shaft 32. It is being Thereby, by further tightening the screw 33 in the direction shown by arrow M, the guide shaft 32 receives a tightening pressure of 0 at the contact point 32a. Arrows X and Y with reference to the contact point 32a.
Force components in two directions shown by are applied to the guide shaft 32. That is, the guide shaft 32 is biased against the side surface 31 of the bent pieces 31b and 31c of the shaft 31 in the direction shown by the arrow P with respect to the 31-gon by fastening the screw 33. As a result, the position of the guide shaft 32 in the direction of the force arrow OP and the direction of the arrow ABN is regulated. At the same time,
The guide shaft 32 is also urged in the direction indicated by the arrow M with respect to the plane 31m of the chassis 31. As a result, the position of the guide shaft 32 relative to the chassis 31 in the direction of arrow MN (direction of arrow CD) is also restricted. In this way, the guide shaft 32 is supported and fixed at a predetermined reference position.

Note that another bent piece 31h provided on the chassis 31,
31i is provided to prevent the screw 33 from falling in the direction shown by arrow E. This is because in this embodiment, the thickness in the direction of the arrow MN in the tapped holes 31d and 31e for fastening the screws 33 is only the thickness of the chassis 31, and the yarn 31 is made of a thin sheet metal. This is because it is considered that 33 is likely to fall in the direction of arrow E. The bent pieces 31h, 31i may be provided so that there is a slight gap in the direction of the force indicated by the arrow OP with respect to the flange 33b of the screw 33. Furthermore, if the bent pieces 31h and 31i cannot be provided, the thickness of the chassis 31 may be increased at the tapped holes 31d and 31e. That is, it is also possible to prevent the screws 33 from falling as described above by performing a drawing process 31n to increase the thickness of the chassis 31 as shown by the two-dot chain line in FIG.

In this way, both ends of the guide shaft 32 can be supported with high precision at predetermined positions relative to the chassis 31 without any play.

[Effects of the Invention] As described above, according to the present invention, the guide shaft and the edge portion for guiding the feeding of the pickup are arranged so as to have an axis or a plane substantially parallel to the main surface of the plate portion. Therefore, it is easy to accurately and stably control the position of the pickup plate portion.

According to another aspect of the present invention, the guide shaft can be fixedly supported at a predetermined position with high precision without any play in the plate portion. Therefore, there is no need for jigs and tools for mounting or regulating the position of parts, or for regulating play during mounting, and the guide shaft can be mounted on the plate portion with a simple operation.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a pickup guide device according to the present invention. FIG. 2 is a side sectional view showing a cross section taken along the line ■-■ in FIG. FIG. 3 is a front view showing the pickup guide device corresponding to FIG. 1. FIG. 4 is a plan view showing another embodiment of the pickup guide device of the present invention. FIG. 5 is a side sectional view showing a cross section taken along the line v--■ in FIG. 4. 3. FIG. 6 is a front view showing the pickup guide device corresponding to FIG. 4. FIG. 7 is a plan view showing the pickup guide device, focusing on the method of attaching the guide shaft to the chassis. FIG. 8 is a side sectional view showing a cross section taken along the line ■-■ in FIG. 7. FIG. FIG. 9 is a front view showing the pickup guide device corresponding to FIG. 7. FIG. 10 is a plan view showing an embodiment of a pickup guide device equipped with improved guide shaft fixing means. FIG. 11 is a right side view showing the pickup guide device corresponding to FIG. 10. FIG. 12 is a front view showing the pickup guide device corresponding to FIG. 10. FIG. 13 is a side view showing details of the guide shaft fixing means. FIG. 14 is a plan view showing a conventional pickup guide device. 4. FIG. 15 is a front view of the pickup guide device corresponding to FIG. 14. In the figure, 1, 21. ．． 31 is the chassis, 2゜12.
22.32 is a guide shaft, 5, 15°, 26.36 is a pickup, 11 is a tilt plate, 31b, 31c are bent pieces, and 33 is a screw. 5 JP-A-3-268278 (9) P N ri

Claims (2)

[Claims] (1) Recording on a recording medium placed on a turntable.
A pickup guide device that guides the feeding of the pickup for reproduction, the device comprising: a main surface; an edge extending along the pickup feeding direction and having a surface substantially parallel to the main surface; a guide shaft extending along the direction and fixed to the plate part so that its axis is substantially parallel to the main surface; and a guide groove formed to sandwich the edge. and a pickup main body having a through hole into which the guide shaft can be inserted. (2) Recording on a recording medium placed on a turntable,
A pickup guide device that guides the feeding of the pickup for reproduction, the device comprising: a main surface; an edge extending along the pickup feeding direction and having a surface substantially parallel to the main surface; a guide shaft extending along the direction and having both ends thereof abutting the main surface of the plate part; a protruding portion provided to abut on both ends of the guide shaft in a direction intersecting with the guide shaft; a screw for fixing on the surface, the screw has a flange, the outer end of the flange is in contact with the outer peripheral surface of the guide shaft, and is formed to clamp the edge. A pickup guide device comprising: a pickup main body having a guide groove in which the guide shaft is inserted, and a through hole into which the guide shaft can be inserted.