JP2002237065A - Light spot scanning/controlling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light spot scanning/controlling device capable of performing focusing control and tracking control for a light spot with high precision. SOLUTION: The device is provided with a movable holder 1 which is elastically supported on a base 17, a turntable 4 which is freely rotated on the movable holder 1, a condensing means 16 which is provided in an eccentric position on the turntable, light beam deflecting means 14 and 15 for guiding a light beam 26 passing through a rotary shaft center 400 to the condensing means 16, a rotor magnet 7 which is provided in the turntable 4, a stator having an armature coil 11 which faces the rotor magnet and is provided in the movable holder 1, and a light spot scanning/controlling means which is provided between the movable holder 1 and the base 17 via a slight gap and performs focusing control and tracking control for a light spot 27 from the condensing means 16. The movable holder 1 can be moved in the focusing and tracking directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical card device,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light spot scanning control device such as an optical tape device, a printer device, or the like, which records and reproduces information by scanning a light spot focused on a medium at a high speed.

[0002]

2. Description of the Related Art FIGS.
Reference numeral 101 denotes a conventional light spot scanning control device, wherein 101 is an optical tape coated with a magneto-optical recording medium, 102 is laser light emitted from a light source (not shown), and 103 is a disc-shaped holding plate. , 104 are holding plates 103
A support shaft connected to the support plate 103 and forming a rotation center of the holding plate 103;
Is a bearing that holds the support shaft 104 with a gap of several μm from the support shaft 104, and is slidably rotatable with low friction.
Reference numeral 06 denotes a radially magnetized cylindrical movable magnet fixed to the holding plate 103 and surrounding the support shaft 104. Reference numeral 107 denotes a cylindrical movable magnet provided on the fixed side so as to face the cylindrical movable magnet 106. A coil 108 is arranged annularly so as to be concentric with the cylindrical movable magnet 106, and a yoke 109 made of a magnetic material constituting a magnetic circuit with the cylindrical movable magnet 106, and 109 is a substantially central portion of the annular portion of the yoke 108. The protrusion 110 formed over the entire periphery of the yoke 10
A coil group fixed to the bottom surface of the coil 8 is composed of a plurality of coils wound in a direction orthogonal to the support shaft 4 as shown in FIG. FIG. 22 shows 111a to 111d.
As shown in FIG. 23, an objective lens 112 fixedly arranged on the surface of the holding plate 103 is a multipolar magnet provided to face the coil group 110 and coupled to the support shaft 104, as shown in FIG. The support shaft 104 is magnetized in the axial direction. Reference numeral 117 denotes a light spot where the laser light 102 is collected by the objective lenses 111a to 111d. The laser beam 102 is applied to the objective lens 111 as shown by a broken line in FIG.
The beam shape is larger than a to 111d.

Next, the operation will be described. Coil group 11
When a current is applied to zero, a force is generated by an electromagnetic action with the multipolar magnet 112, and the holding plate 103 rotates in the direction of the arrow R via the support shaft 104. When a current is applied to the cylindrical coil 107, a force in the direction of arrow F is generated by the electromagnetic action with the cylindrical movable magnet 106, and the holding plate 103
Displace in the direction.

The laser spot 102 is made incident on the objective lenses 111a to 111d of the optical spot scanning control device operating as described above, and the optical spot 117 scans the optical tape 101 by rotating the objective lenses 111a to 111d. By applying a control current according to the defocus of the spot 117, the focus of the light spot 117 can be controlled, and recording / reproduction of the recording track 116 as shown in FIG. 26 can be performed.

[0005]

Since the conventional light spot scanning control device is configured as described above, tracking control of the light spot 117 with respect to the recording track 116 cannot be performed, and the holding plate 103 and the optical tape 101 cannot be controlled. The light spot 117 and the recording track 116 were displaced due to vibration or the like, and stable reproduction was not possible.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a light spot scanning control device capable of performing a focus control and a tracking control of a light spot with high accuracy. And

[0007]

The present invention has the following configuration to achieve the above object. That is, the light spot scanning control device according to the first aspect of the present invention is a movable holder that is floated on a base via a stretched spring member and is elastically supported, and is rotatably held at a central portion of the movable holder. A turntable provided on the turntable, a light condensing means located at a position eccentric from a rotation axis of the turntable at a predetermined distance, and a light beam provided on the turntable and passing through the rotation axis. A light beam deflecting means for guiding to the means, a rotor magnet provided on the turntable, a stator having an armature coil provided on the movable holder so as to face the rotor magnet, and the movable holder and the base. It is provided with a minute gap between them, and performs focusing control and tracking control of the light spot emitted from the light condensing means. A light spot scanning control means, and the movable holder can be moved in a focus direction and a tracking direction by elastic deformation of the spring member when the light spot scanning control means is operated. I do.

According to a second aspect of the present invention, there is provided the light spot scanning control device according to the first aspect, wherein the light spot scanning control means includes a focusing control coil and a tracking control coil provided on the movable holder; A magnetic circuit is provided on the base and includes a permanent magnet and a yoke for providing a linkage magnetic flux to the focusing control coil and the tracking control coil.

The invention described in claim 3 is the first or second invention.
According to the optical spot scanning control device described above, while forming the spring member with a leaf spring, a notch portion is formed in the vicinity of the fixed portion to the base and the fixed portion to the movable holder. Features.

According to a fourth aspect of the present invention, there is provided the light spot scanning control device according to the third aspect, wherein the cutout portion of the leaf spring has a shape symmetrical with respect to a center line of the width of the leaf spring. Features.

The invention according to claim 5 is the invention according to claim 3 or 4.
According to the optical spot scanning control device described above, a protruding portion is formed in the same plane as the leaf spring extension surface adjacent to the notch portion of the leaf spring, and the plate is formed in the vicinity including the notch portion. A damping agent for suppressing vibration of a spring is attached.

According to a sixth aspect of the present invention, there is provided the optical spot scanning control device according to any one of the third to fifth aspects, wherein a hole is formed at both ends of the leaf spring on the center line of the width of the leaf spring. Is formed.

According to a seventh aspect of the present invention, there is provided the light spot scanning control device according to any one of the third to sixth aspects, wherein a fixing portion of the leaf spring to the base is the same as a leaf spring extension surface. A protrusion or a notch is formed in the plane.

According to an eighth aspect of the present invention, there is provided the optical spot scanning control device according to any one of the third to seventh aspects, wherein the spring member is formed of a conductive material while the movable holder is formed of the plate. After being fixed to the spring, the plate spring is cut in the vicinity of the substantially central portion in the extending direction, and the cut leaf spring is used as a feed line for the armature coil, the focusing control coil, and the tracking control coil. I do.

According to a ninth aspect of the present invention, there is provided the light spot scanning control device according to any one of the first to eighth aspects, wherein the light spot scanning control device is formed in a U-shape between the movable holder and the base. A pair of free ends of the torsion spring are fitted into holes provided in the movable holder, and a connecting portion joining the pair is rotatably supported by the base. The rolling behavior of the movable holder is prevented by torsional deformation of a spring.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a plan view of a main part of a light spot scanning control device according to the present invention, FIG. 2 is a front view of the device shown in FIG. 1, FIG.
FIG. 5 is a sectional view of a main part of the apparatus shown in FIG. 1 including an optical card which is an optical recording medium along BB, FIG. 5 is a plan view of a movable holder part of the apparatus shown in FIG. 7 is a cross-sectional view of the apparatus shown in FIG. 1 along CC, FIG. 8 is an enlarged plan view of a main part showing a leaf spring elastically supporting the movable holder, and FIG. 9 is a cutaway of the above-mentioned leaf spring. FIG. 10 is a partially enlarged cross-sectional view showing a method of mounting a ball bearing provided on a movable holder, and FIG. 11 is data recorded on an optical card using the optical spot scanning control device. It is a figure showing a track. In the drawing, 1 is a movable holder, 2 is a bearing holding portion provided at the center of the movable holder 1, 3 is a bearing receiving surface, 4
Reference numeral 7 denotes a turntable provided rotatably in the direction of arrow R on the movable holder 1 via ball bearings 5a and 5b.
Reference numeral 8 denotes a rotor magnet provided on the magnet holding portion 6 below the turntable 4. Reference numeral 8 denotes a movable member having teeth 10 formed by laminating magnetic materials and having pole teeth 9 facing the outer peripheral surface of the rotor magnet 7. A stator core fixedly provided on the holder 1, 11 is an armature coil wound around the teeth 10, 12a and 12b are rectangular focusing control coils fixedly provided on both sides of the movable holder 1, 13a, 13b, 13c and 13d are rectangular tracking control coils fixedly provided on the peripheral side of the focusing control coils 12a and 12b, and 14 is fixedly provided on the turntable 4 near the rotation center of the turntable 4. The first reflection mirror 15 is turned at a position eccentric by a predetermined distance from the rotation center axis 400 of the turntable 4. The second reflecting mirror 16 fixedly provided on the turntable 4 is eccentric from the rotation center axis 400 of the turntable 4 by a predetermined distance, and the objective lens fixedly provided on the turntable 4 above the second reflecting mirror 15. It is.

Reference numeral 17 denotes a base, and reference numerals 18 and 19 denote leaf spring holders erected on the base 17, which are fixed to the base by screws 20 and 21. , 22a, 22b, 22c, 2
2d is a leaf spring for elastically supporting the movable holder 1 on the base 17, 23a, 23b are U-shaped yokes fixedly provided on the base 17, 24a, 24b, 24c,
24d is a plate-like magnet provided to face the inside of the yokes 23a and 23b.

Reference numeral 25 denotes an optical card coated with, for example, an organic dye medium, and reference numeral 26 denotes a light beam emitted from an optical head (not shown). The light beam 26 is reflected by the first reflection mirror 14 and the second reflection mirror 15 and enters the objective lens 16, and the light spot 2 is placed on the optical card 25.
7 is formed. The rotation center axis 400 of the turntable 4 is provided so as to be orthogonal to the surface of the optical card 25, and the optical axis 28 of the light beam 26 entering the first reflection mirror 14 is provided.
And the rotation center axis 400 of the turntable 4 coincides or substantially coincides with each other, and the optical axis 29 of the light beam reflected by the first reflection mirror 14 is parallel or almost parallel to the optical card 25. Further, the optical axis 30 of the light beam 26 reflected by the second reflection mirror 15 is provided to be orthogonal to the optical card 25. 38
Are a turntable 4, a rotor magnet 7, a first reflection mirror 14, a second reflection mirror 15, and an objective lens 16.
The counterbalance unit is provided so that the position of the center of gravity of the rotary scanning unit composed of is located on the rotation center axis 400 of the turntable 4.

As shown in FIG. 10, the ball bearings 5a and 5b are attached to the movable holder 1 by inserting the ball bearings 5b into the bearing holder 2 so that the lower end surface 5b2 of the inner ring 5b1 is brought into contact with the bearing receiving surface 3. A spacer 31 is inserted on the upper surface 5b4 of the outer ring 5b3 of the ball bearing 5b and the lower surface 5a2 of the outer ring 5a1 of the ball bearing 5a, and the ball bearing 5a is further inserted into the inner ring 5a of the ball bearing 5a.
This is performed by fixing the inner rings 5a3, 5b1 of the ball bearings 5a, 5b to the bearing holding portion 2 by means such as bonding while preloading the upper end surface 5a4 of the third bearing 3 with a predetermined force Fb. Thereafter, the turntable 4 is attached to the outer rings 5a1, 5b3 of the ball bearings 5a, 5b by means such as bonding. 33 is turntable 4
And an adhesive groove provided in the bearing fitting portion 32 of the above. Thus, the bearings 5a, 5b
Is fixed to the movable holder 1 while applying a preload to
The configuration is such that non-linear displacement such as play does not occur between the movable holder 1 and the turntable 4.

The stator core 8 is attached to a stator fitting portion 34 provided concentrically with the bearing holding portion 2 provided on the movable holder 1 such that the tangent circle of the pole teeth 9 is concentric with the bearing holding portion 2. It is fitted. As described above, the tangent circles of the bearing holder 2, the ball bearings 5a and 5b, the rotor magnet 7, and the pole teeth 9 are provided so as to be concentric.

Focusing control coils 12a, 12
b denotes a coil positioning portion 35a, 35b, 35c, 35d provided on a side portion of the movable holder 1 and a coil contact surface 36.
a, 36b and fixed to the movable holder 1. Tracking control coils 13a, 13
b, 13c and 13d are focusing control coils 12
a, 12b are fixed to surfaces opposite to the coil contact surfaces 36a, 36b. Focusing control coil 12
a, 12b and tracking control coils 13a, 13
b, 13c, 13d are the rotation center axes 4 of the turntable 4.
It is arranged symmetrically with respect to an axis passing through 00, for example, BB shown in FIG. 37a, 37b, 37c,
37d is a hole provided symmetrically with respect to the rotation center axis 400 of the turntable 4 in order to reduce the weight of the movable holder 1. The movable scanning unit including the movable holder 1, the ball bearings 5a and 5b, the stator core 8, the armature coil 11, the focusing control coils 12a and 12b, the tracking control coils 13a, 13b, 13c, and 13d, and the rotation scanning unit are totally Of the turntable 4 is provided on the rotation center axis of the turntable 4. In this way, the total center of gravity position is
In this case, focusing control and tracking control, which will be described later, can be performed stably.

Yoke 23b and magnets 24c and 24d
Are the focusing control coil 12b and the tracking control coils 13c and 13c as shown in FIGS.
The part d is disposed so as to be located in a magnetic gap formed by the yoke 23b and the magnets 24c and 24d. The yoke 23a, the magnets 24a, 24
The same applies to the relationship between b and the focusing control coil 12a and the tracking control coils 13a and 13b.

Reference numerals 39a and 39b denote leaf spring fixing portions for fixing the leaf spring 22a to the movable holder 1, and adhesive 39
The leaf spring 22a is fixedly held by 1a and 391b. 4
Reference numerals 0a and 40b denote leaf spring fixing portions for fixing the leaf spring 22b to the movable holder 1, and adhesives 401a and 401b
The plate spring 22b is fixedly held. Reference numerals 41a and 41b denote leaf spring fixing portions for fixing the leaf spring 22c to the movable holder 1. The leaf springs 2a are provided by adhesives 411a and 411b.
2c is fixedly held. 42a and 42b are leaf spring fixing portions for fixing the leaf spring 22d to the movable holder 1, and fix and hold the leaf spring 22c with adhesives 421a and 421b. 181a, 181b, 181c, 181d are formed on the leaf spring holder 18, and the leaf springs 22a, 22b, 22
This is a leaf spring fixing part for holding and fixing the vicinity of the ends of c and 22d. The leaf springs 22a, 22b, 22c and 22d are fixed and held by adhesives 182a, 182b, 182c and 182d. 191a, 191b, 191c, 191d are formed on the leaf spring holder 19, and the leaf springs 22a, 22b, 22
A leaf spring fixing portion for holding and fixing the vicinity of the ends of c and 22d. The leaf springs 22a, 22b, 22c and 22d are fixed and held by adhesives 192a, 192b, 192c and 192d. With these configurations, the leaf springs 22a, 22b, 2
2c and 22d are provided with a prescribed tension by a method described later so as to be parallel to each other.

Reference numeral 221a denotes a fixing portion 1 of the leaf spring holder 18.
81a, the leaf spring 22a
a projection 222a formed in the same plane as the extension surface of
Is a notch formed in the vicinity of the fixed portion 181a of the leaf spring 22a, symmetrically with respect to the center line 220a of the leaf spring width, and 223a is a fixed portion 3 of the movable holder 1 of the leaf spring 22a.
In the vicinity of 9a, cutouts 224a and 225a formed symmetrically with respect to the center line 220a of the leaf spring width are formed adjacent to the cutouts 222a and in the same plane as the leaf spring extension surface. The protrusions 226a and 227a are protrusions formed adjacent to the notch 223a and in the same plane as the plane where the leaf spring extends. The projection 221a, the cutouts 222a, 223a, and the projections 224a, 225a, 226a, 227a formed on the leaf spring 22a are formed symmetrically with respect to the axis BB shown in FIG. 22
8a and 229a are holes formed on the center line 220a at both ends of the leaf spring 22a. As described above, the projection 221b and the notch 22 are provided on the leaf spring 22b.
2b, 223b, protrusions 224b, 225b, 226
b, 227b and holes 228b, 229b
c has a projection 221c, a notch 222c, and 223.
c, protrusions 224c, 225c, 226c, 227c,
Holes 228c and 229c are provided on the plate spring 22d,
21d, notches 222d, 223d, protrusion 224
d, 225d, 226d, 227d, hole 228d, 2
29d are provided respectively.

Reference numerals 43a, 44a, 45a, and 46a denote viscoelastic damping agents having a large damping characteristic and made of butyl, rubber, ultraviolet curable synthetic resin, and the like. The damping agents 44a and 45a are symmetrically attached to the leaf spring 22a at two locations symmetrically with respect to the axis BB, and are attached to a range including the notch 222a and the protrusions 224a and 225a symmetrically formed at two locations on the leaf spring 22a. Notch 2
23a and the protrusions 226a and 227a are attached. Similarly to the above, damping agents 43b, 44b, 45b, 46b are provided on the leaf spring 22b, and damping agents 43c, 44c, 45c, 46 are provided on the leaf spring 22c.
c, the leaf spring 22d has damping agents 43d, 44d,
45d and 46d are respectively attached.

Next, the leaf springs 22a, 22b, 22
The jigs used when stretching c and 22d are shown. FIG.
Is a main part plan view showing a state where the light spot scanning control device is attached to a jig, FIG. 13 is a front view of the state shown in FIG. 12,
14 is a view taken in the direction of arrow D in the state shown in FIG. 12, in which 50 is a jig base, 51 and 52 are positioning pins, which fit into holes 17a and 17b provided in the base 17, and And the jig base 50 are positioned.
53a, 53b, 53c and 53d are screws for fastening the base 17 on the jig base 50. Reference numeral 54 denotes a block standing on the jig base 50 and fastened to the jig base 50 by screws 55. 56 and 57 are leaf springs 22a,
It is a pin installed on an extension of the center lines 220a and 220b of 22b.

Next, the operation will be described. First, a method of stretching a leaf spring will be described. Screw 20 on base 17,
21 the plate spring holders 18 and 19 are erected and fastened. Next, the holes 17a, 17b of the base 17 are fitted into the positioning pins 51, 52 of the jig base 50 on which the block 54 is erected, and after positioning the base 17 on the jig base 50, the screws 53a, 53b, Fastened by 53c, 53d. The hole 228c formed in the leaf spring 22c is
Then, holes 228d formed in the leaf spring 22d are fitted to the pins 57, respectively, and are stretched in the direction of arrow E in the figure by tension applying means (not shown). At this time, by using the holes 229c and 229d provided in the leaf springs 22c and 22d,
It is easy to apply tension. Leaf spring 22c, 2 at specified tension
With the 2d stretched, the fixing portions 181c, 181d, 1
91c and 191d and the leaf springs 22c and 22d
2c, 182d, 192c, and 192d are used for bonding and fixing. Projection portions 221 formed on leaf springs 22c and 22d
c, 221d with adhesive 182c, 182d, 192c,
By bonding in a state covered by 192d, after the adhesives 182c, 182d, 192c, and 192d are cured, the leaf springs 22c and 22d are unlikely to be displaced in the direction of arrow E or the opposite direction. Even if the tension is removed, the specified tension applied to the leaf springs 22c and 22d is maintained. Further, the fixing portion 181c,
181d, 191c, 191d and leaf springs 22c, 22d
Adhesive 182c, 182d, 192c, 1
Even if 92d is not applied, the adhesives 182c, 182d, and 192 may be applied from the surroundings so as to cover the protrusions 221c and 221d.
By simply applying c and 192d, the leaf springs 22c and 22d are fixed and hardly displaced in the direction of arrow E or in the opposite direction, so that assembly can be performed easily.

Next, by positioning the movable holder 1 at a predetermined position, the leaf spring 22c and the fixed portions 41a and
1b, the leaf spring 22d is brought into contact with the fixing portions 42a and 42b, and the adhesives 411a, 411b, 421a, 421b
Fix with. The components mounted on the movable holder 1, the yokes 23a and 23b, the magnet 24a,
The magnetic circuit composed of 24b, 24c and 24d is separately and appropriately assembled, but the description is omitted here. Next, the hole 228a formed in the leaf spring 22a is
The holes 228b formed in the holes 2b are fitted to the pins 57, respectively, and are stretched in the direction of the arrow E in the figure by tension applying means (not shown). At this time, the hole 2 provided in the leaf springs 22a and 22b
The use of 29a, 229b facilitates the application of tension. In the state where the leaf springs 22a and 22b are stretched with the specified tension, the fixing portions 181a, 181b, 191a, and 19 are fixed.
1b and the leaf springs 22a, 22b with adhesives 182a, 182
b, 192a and 192b. Leaf spring 2
By bonding the projections 221a and 221b formed on the 2a and 22b while covering them with the adhesives 182a, 182b, 192a and 192b, the adhesives 182a and 182b are bonded.
After the hardening of the leaf springs 2b, 192a and 192b,
Since a and 22b are unlikely to be displaced in the direction of arrow E or in the opposite direction, the specified tension applied to the leaf springs 22a and 22b is maintained even if the tension by the tension applying means (not shown) is removed. Further, the fixing parts 181a, 181b, 19
Even when the adhesive 182a, 182b, 192a, 192b is not applied to the contact surface between the plate springs 1a, 191b and the leaf springs 22a, 22b, the adhesive 182a, 182b, 192a, By simply applying 192b, the leaf springs 22a and 22b are fixed and the arrow E
Since it is unlikely to be displaced in the direction or the opposite direction, assembly can be performed easily. By the above, the leaf spring 22
a and the fixing portions 39a and 39b, and the leaf spring 22b and the fixing portions 40a and 40b are in contact with each other.
It is fixed by 391b, 401a, and 401b. As a result, the movable holder 1 has the leaf springs 22a, 22b, 22c, 2
2d elastically supports the base 17 with a specified tension.

If the tension of the leaf springs 22a, 22b, 22c, 22d is too low or if the tension varies, the leaf springs 22a, 22b, 22c, 22d bend.
Since the movable holder 1 cannot be positioned and held at the specified position, it becomes an obstacle to the recording and reproduction of the data track 60 described later. Conversely, if the tension of the leaf springs 22a, 22b, 22c, 22d is too high, the leaf springs 22a, 22b, 22c,
22d and the natural frequency of a spring system composed of movable parts such as the movable holder 1 and the turntable 4 increase, which hinders focusing control and tracking control described later. For this reason, the leaf springs 22a, 22b, 22c, 22d
It is necessary to apply a specified tension without any variation and fix it, but this can be easily performed by the above method.

When tension is applied to the leaf springs 22a, 22b, 22c, 22d, holes 228a,
29a, 228b, 229b, 228c, 229c, 2
28d and 229d, which are formed on the center lines 220a, 220b, 220c and 220d in the width direction, so that the leaf spring 22
No deformation such as bending occurs at a, 22b, 22c, and 22d. Further, for the reasons described later, the leaf springs 22a, 22b, 2
Notches 222a, 223a, 22 are provided in 2c, 22d.
2b, 223b, 222c, 223c, 222d, 22
3d, which are also formed in the center line 22 in the width direction.
Since it is formed symmetrically with respect to 0a, 220b, 220c, and 220d, even if tension is applied in the same manner as described above, the leaf springs 22a, 22b, 22c, and 22d do not deform such as bending.

Next, a recording / reproducing operation using a light beam will be described. When a desired current flows through the amateur coil 11, a force in the direction of arrow R is generated by the electromagnetic action with the rotor magnet 7, and the turntable 4 rotates in the direction of arrow R. The focusing control coil 12
a, 12b, the yoke 23a, 23
b, focusing control coils 12a, 12 formed by magnets 24a, 24b, 24c, 24d
The force in the direction of arrow F is generated by the electromagnetic action with the magnetic flux linking b, and the movable holder 1 and the turntable 4 mounted on the movable holder 1 translate in the direction of arrow F.
Further, the tracking control coils 13a, 13b, 1
3c and 13d, the yoke 23a,
3b, tracking control coils 13a, 13 formed by magnets 24a, 24b, 24c, 24d
A force in the direction of arrow T is generated by the electromagnetic action with the magnetic flux linking b, 13c, and 13d, and the movable holder 1 and the turntable 4 placed on the movable holder 1 translate in the direction of arrow T. As shown in FIG. 4, a light beam 26 is incident on the light spot scanning control device that operates as described above, a light spot 27 is formed, and the turntable 4 is driven to rotate. Focusing control can be performed by scanning and applying a control current corresponding to the defocus detected by the optical head (not shown) of the light spot 27 to the focusing control coils 12a and 12b. Since the tracking control can be performed by applying a control current corresponding to the detected track deviation to the tracking control coils 13a, 13b, 13c, and 13d, recording and reproduction of the data track 60 as shown in FIG. 11 can be performed.

The focusing control coil 12
When a control current is applied to the movable holders a and 12b, it is desirable that the movable holder 1 translates only in the focus direction (the direction of the arrow F in the drawing). In this case, the operation may interfere with the tracking control, so that recording and reproduction of the data track 60 may be hindered. On the other hand, in the above embodiment, the leaf springs 22a, 22b, 22c, 2
Since the extension direction of 2d is the horizontal direction, the rigidity in the focus direction (the direction of arrow F in the drawing) perpendicular to the horizontal direction is reduced, and only the deformation in this direction becomes easy. Therefore, when the focusing control coils 12a and 12b are energized, the movable holder 1 elastically supported by the leaf springs 22a, 22b, 22c and 22d can easily translate in the focus direction (the direction of arrow F in the drawing), Since it is difficult to move in other directions, stable focusing control can be performed. Further, the leaf springs 22a, 22b, 2
Since the extension direction of 2c and 22d is set to the horizontal direction, the rigidity in the tracking direction (the direction of arrow T in the drawing) increases,
Notch 2 in leaf springs 22a, 22b, 22c, 22d
22a, 223a, 222b, 223b, 222c, 2
When the control current is applied to the tracking control coils 13a, 13b, 13c, and 13d, the movable holder 1 easily translates in the tracking direction (the direction of arrow T in the drawing) because the control currents 23c, 222d, and 223d are provided. It can be carried out. Further, the leaf springs 22a, 22b, 22c,
22d notches 222a, 223a, 222b, 2
In the vicinity including 23b, 222c, 223c, 222d, and 223d, damping agents 43a, 46a, 44a, 45a, 43b, 46b having a large viscoelasticity with a large damping property.
44b, 45b, 43c, 46c, 44c, 45c, 4
Since 3d, 46d, 44d, and 45d are attached, the movable holder 1 becomes a hindrance to recording and reproduction of the data track 60.
(Moving operation in the direction of arrow r in FIG. 3) can be suppressed. In addition, leaf springs 22a, 22b, 22c, 22
d cutouts 222a, 223a, 222b, 223
b, 222c, 223c, 222d, 223d adjacent to the projections 224a, 225a, 226a, 227a, 2
24b, 225b, 226b, 227b, 224c, 2
25c, 226c, 227c, 224d, 225d, 2
Since 26d and 227d are provided, the damping agent 43a,
46a, 44a, 45a, 43b, 46b, 44b, 4
5b, 43c, 46c, 44c, 45c, 43d, 46
d, 44d, and 45d can be easily attached so as to effectively act on rolling suppression of the movable holder 1.

As described above, the focus control of the light spot 27 and the tracking control with respect to the data track 60 can be performed while rotating and scanning the light spot 27, so that stable data recording and reproduction can be performed. Also, two ball bearings 5a and 5b are used as means for rotatably supporting the turntable 4 on the movable holder 1, and a preload is applied when the ball bearings 5a and 5b are fixed to the movable holder 1. Non-linear displacement or the like does not occur between the movable holder 1 and the turntable 4 and stable rotation of the turntable 4 can be obtained, and stable focusing control and tracking control of the light spot 27 can be performed. . Further, the focusing control coils 12a and 12b and the tracking control coil 13
Since a, 13b, 13c, and 13d are symmetrically arranged on the movable holder and the total center of gravity of the rotary scanning unit and the movable holder unit is located on the rotation center axis 400 of the turntable 4, focusing control is performed. In addition, it becomes possible to drive symmetrically with respect to the position of the center of gravity during the tracking control operation, the inclination of the movable holder 1 due to the focusing control operation and the tracking control operation is eliminated, and stable focusing control and tracking control become possible. In addition, since the position of the center of gravity of the rotary scanning unit is also located on the rotation center axis 400 of the turntable 4, vibration due to rotation of the turntable 4 can be minimized. Further, the movable holder 1 is connected to the leaf springs 22a, 22b, 2
2c and 22d, the base 17
Notches 222a, 22 near the fixed portions to the leaf spring holders 18, 19 and the fixed portion to the movable holder 1
3a, 222b, 223b, 222c, 223c, 22
Since the 2d and 223d are formed, it is possible to reduce the movement operation of the elastically supported movable holder 1 in directions other than the focusing direction and the tracking direction, and it is possible to perform stable focusing control and tracking control operation of the light spot 27. Become. Further, the notch 222
a, 223a, 222b, 223b, 222c, 223
In the vicinity including c, 222d, and 223d, damping agents 43a, 46a, and 44 having viscoelasticity with a large damping property.
a, 45a, 43b, 46b, 44b, 45b, 43
c, 46c, 44c, 45c, 43d, 46d, 44
Since d and 45d are attached, rolling of the movable holder 1 which is a hindrance to recording and reproduction of the data track 60 can be suppressed, and stable focusing control of the light spot 27 can be performed.
The tracking control operation becomes possible.

Further, the leaf springs 22a, 22b, 22c,
22d notches 222a, 223a, 222b, 2
23b, 222c, 223c, 222d, 223d adjacent to the projections 224a, 225a, 226a, 227
a, 224b, 225b, 226b, 227b, 224
c, 225c, 226c, 227c, 224d, 225
d, 226d, and 227d, the damping agent 4
3a, 46a, 44a, 45a, 43b, 46b, 44
b, 45b, 43c, 46c, 44c, 45c, 43
d, 46d, 44d, and 45d can be easily attached to each other, and can be attached so as to effectively work to suppress the rolling of the movable holder 1. Further, leaf springs 22a, 22b,
Holes 228a, 229a, 22 at both ends of 22c, 22d
8b, 229b, 228c, 229c, 228d, 22
9d, which is used to apply tension during assembly, so that leaf springs 22a, 22b, 22
The specified tension can be applied to c and 22d without variation, and stable focusing control and tracking control operation of the light spot 27 can be performed. Further, the leaf spring 22
a, a hole portion 228a formed in 22b, 22c, 22d,
229a, 228b, 229b, 228c, 229c,
228d, 229d are leaf springs 22a, 22b, 22
center lines 220a, 220b, 22 in the width direction of c, 22d
0c, 220d, the plate springs 22a, 22b, 22c, 22d even when tension is applied.
No deformation such as bending occurs. Further, a leaf spring 22a,
Notch 222 formed in 22b, 22c, 22d
a, 223a, 222b, 223b, 222c, 223
c, 222d and 223d are center lines 220a in the width direction,
Since they are formed symmetrically with respect to 220b, 220c and 220d, the leaf spring 22
No deformation such as bending occurs at a, 22b, 22c, and 22d. Further, since the projections 221a, 221b, 221c, 221d are formed on the leaf springs 22a, 22b, 22c, 22d, the fixing portions 181a, 181b, 191a, 191b, 181 of the leaf springs 22a, 22b, 22c, 22d are formed.
c, 181d, 191c, and 191d can be easily adhered and fixed, and the displacement in the tension applying direction is unlikely to occur.

Although the thickness direction of the leaf springs 22a, 22b, 22c, and 22d is set as the focusing direction in the first embodiment, the thickness direction may be set as the tracking direction. In the first embodiment, the cutouts 222a, 223a, 222b, 223b, 222 of the leaf springs 22a, 22b, 22c, 22d are formed.
projections 224a, 225a, 226a, 227a, 224 provided adjacent to c, 223c, 222d, 223d
b, 225b, 226b, 227b, 224c, 225
c, 226c, 227c, 224d, 225d, 226
d, 227d are leaf springs 22a, 22b, 22c, 22
d center line 220a, 220b, 220c, 2 in the width direction
Although an example is shown in which it is formed asymmetrically with respect to 20d, the shape may be symmetrical. Further, the leaf springs 22a, 22b, 2
2c, 22d fixing parts 181a, 181b, 191a,
At positions fixed to 191b, 181c, 181d, 191c, and 191d, protrusions 221a, 221b, and 221c are provided.
Although the example in which 221d is formed is shown, a notch may be provided, and a similar effect is exhibited.

Embodiment 2 In the present embodiment, the amateur coil 11, the focusing control coils 12a,
2b, tracking control coils 13a, 13b, 13
The connection method of c and 13d will be described. FIG. 15 is a plan view of the movable holder portion of the light spot scanning control device of the present invention, from which the rotary scanning portion is omitted. Except for the connection method, the third embodiment is the same as the first embodiment, and the description other than the connection is omitted. In the figure, 500 is the movable holder 1
Is a coil connection board provided so as to cover the stator core 9 and the armature coil 12 on the upper surface. 1101 is a U-phase terminal of the amateur coil 11, 1102 is a V-phase terminal of the amateur coil 11, 1103 is an amateur coil 1
1 W-phase terminal. Reference numeral 501 denotes a U-phase land portion.
The phase terminal 1101 is soldered. Reference numeral 502 denotes a V-phase land portion to which a V-phase terminal 1102 is soldered. 503
Denotes a W-phase land portion, and the W-phase terminal 1103 is soldered. Reference numeral 504 denotes a U-phase lead land, which is connected to the U-phase land 501 and to which a lead 505 is soldered. Reference numeral 506 denotes a V-phase lead land, which is connected to the V-phase land 502 and has a lead line 507.
Are soldered. Reference numeral 508 denotes a W-phase lead land portion, which is connected to the W-phase land portion 503 and to which a lead wire 509 is soldered. Reference numeral 511 denotes an F1 land portion, which is a terminal 12a1 of the focusing control coil 12a.
Are soldered. Reference numeral 512 denotes an F2 land portion to which a terminal 12a2 of the focusing control coil 12a is soldered. Reference numeral 513 denotes an F3 land portion, which is connected to the F1 land portion 511 and soldered to the terminal 12b1 of the focusing control coil 12b. 514 is F
Focusing control coil 12b, which is a 4-land part
Terminal 12b2 is soldered. Reference numeral 515 denotes a first focus control coil lead land portion, which is connected to the F2 land portion 512 and to which a lead wire 516 is soldered. Reference numeral 517 denotes a second focus control coil lead land portion, which is connected to the F4 land portion 514 and to which a lead wire 518 is soldered.

Reference numeral 521 denotes a T1 land portion to which a terminal 13a1 of the tracking control coil 13a is soldered. Reference numeral 522 denotes a T2 land portion to which the terminal 13a2 of the tracking control coil 13a is soldered. 523
Is a T3 land portion, which is connected to the T2 land portion 522 and the terminal 13 of the tracking control coil 13b.
b1 is soldered. 524 is a T4 land portion,
The terminal 13b2 of the tracking control coil 13b is soldered. Reference numeral 525 denotes a T5 land portion, which is connected to the T1 land portion 521 and soldered to the terminal 13c1 of the tracking control coil 13c. 526 is T
The six lands are soldered to terminals 13c2 of the tracking control coil 13c. Reference numeral 527 denotes a T7 land, which is connected to the T6 land 526 and soldered to the terminal 13d1 of the tracking control coil 13d. Reference numeral 528 denotes a T8 land portion to which a terminal 13d2 of the tracking control coil 13d is soldered. 5
Reference numeral 29 denotes a first tracking control coil lead land portion, which is connected to the T4 land portion 524 and to which a lead wire 530 is soldered. Reference numeral 531 denotes a second tracking control coil lead-out land portion, which is connected to the T8 land portion 528 and to which a lead-out wire 531 is soldered. 22a1, 22a2, 22b1, 22
b2, 22c1, 22c2, 22d1, 22d2 are leaf springs, which are leaf springs 22a, 22a,
After applying a specified tension to 2b, 22c and 22d, the plate springs 18 and 19 and the movable holder 1 are bonded and fixed.
It is formed by cutting a substantially central portion. A lead line 530 is provided on the leaf spring 22a1 and the leaf spring 22a2 is provided.
, A lead line 505 for the leaf spring 22b1, a lead line 509 for the leaf spring 22b2,
The lead wire 516 is connected to the leaf spring 22c1.
A lead wire 518 is soldered to 2 and a lead wire 507 is soldered to the leaf spring 22d1.

As described above, the apparatus can be simplified by using the leaf springs as the power supply lines to the focusing control coils 12a and 12b and the tracking control coils 13a, 13b, 13c and 13d. Although not specifically described, in this case, it is needless to say that the leaf spring holders 18 and 19 and the movable holder 1 are made of a non-conductive material. In the second embodiment, between the focusing control coils 12a and 12b or the tracking control coils 13a, 13b, 13c and 13d.
Although the method of connecting with the connection board 500 has been described between them, the coils may be directly connected without using the connection board 500.

Embodiment 3 In this embodiment, the base 1
A configuration for preventing the rolling behavior of the movable holder 1 elastically supported by 7 will be described. 16 is a plan view of a main part of the light spot scanning control device of the present invention, FIG. 17 is a front view of the device shown in FIG. 16, FIG. 18 is an EE sectional view of the device shown in FIG.
19 is a side view of the device shown in FIG. 16 as viewed in the direction of arrow F. FIG. 20 is a side view of the device shown in FIG. FIG. 1
6, the fixing portions 181a, 18a of the leaf spring holder 18
1b, 181c, leaf spring 22 of the part which contacts 181d
a, 22b, 22c, and 22d are omitted. In the figure, reference numeral 100 denotes a first projection formed on the movable holder 1, and 101 denotes a second projection formed on the movable holder, which is formed symmetrically with respect to the center line HH of the movable holder.
Reference numeral 61 denotes a U-shaped torsion spring, and a pair of opposed end portions 61a and 61b are formed by a hole 102 formed in the first protrusion 100 and a hole formed in the second protrusion 101. The part 103 is fitted. The hole 102,
The inner diameter of 103 is formed substantially the same as the outer diameter of torsion spring 61. Reference numerals 18a and 18b denote spring receivers formed on the leaf spring holder 18, which are formed with grooves having substantially the same width as the outer diameter of the torsion spring 61 and are formed symmetrically with respect to the center line HH of the movable holder 1. . Reference numeral 62 denotes a stopper, which is fastened to the leaf spring holder 18 by the fastening screw 20 of the leaf spring holder 18. The torsion spring 61 is supported by the spring receivers 18a and 18b and the stopper 62 so as to be rotatable in a direction indicated by an arrow J in a connecting portion 61c that joins a pair of opposed springs. The other configuration is the same as that of the first embodiment, and the description is omitted.

Next, the operation will be described. As in the first embodiment, the focusing control coils 12a and 12b
, The movable holder 1 and the turntable 4 mounted on the movable holder 1 are substantially translated in the arrow F direction. Tracking control coil 13
When the currents a, 13b, 13c, and 13d are energized, the movable holder 1 and the turntable 4 mounted on the movable holder 1 substantially translate in the arrow T direction. At this time, when the movable holder 1 shows a rotating behavior in the rolling direction (for example, the direction of the arrow r1 in the drawing), the end 61a of the torsion spring 61 fitted into the hole 102 of the projection 100 of the movable holder 1 The end 61b of the torsion spring 61 fitted in the hole 103 of the projection 101 of the movable holder 1 in the downward direction tends to be displaced in the upward direction. As a result, a torsion in the direction indicated by the arrow J is generated in the connection portion 61c of the torsion spring 61, but a resistance to this torsion is generated by the spring property, so that the rolling behavior of the movable holder 1 is prevented. Therefore, no focusing or tracking control failure due to the rolling behavior of the movable holder 1 occurs.
Recording and reproduction of the data track 60 can be performed accurately. Note that the movable holder 1 is in the focus direction (the arrow F direction in the drawing).
, The end portion 61a of the torsion spring 61,
The torsion spring 61 moves up and down at the same time.
Since the movable holder 1c is rotatably supported, it does not hinder the translation of the movable holder 1 in the focus direction. In addition, the movable holder 1 moves in the tracking direction
When the torsion spring 61 is to be translated, the ends 61a and 61b of the torsion spring 61 are also moved in the direction indicated by the arrow T to translate the entire torsion spring 61.
The movement in the direction T is not restricted, and the torsion spring 61 can move freely in the direction indicated by the arrow T in the figure, so that the translation of the movable holder 1 in the tracking direction is not hindered.

In the third embodiment, one torsion spring 61 is used and is supported by the spring receivers 18a and 18b of one leaf spring holder 18. However, the other leaf spring holder 19 also receives the spring. 19a and 19b are provided to support a second torsion spring and torsion spring 2
The rolling behavior of the movable holder 1 may be prevented by individual pieces. Further, in the third embodiment, the plate springs 22a, 22b, 22c, and 22d are used as the members for elastically supporting the movable holder 1 in the same manner as in the first embodiment. Alternatively, the elastic member may be elastically supported by an elastic member having another shape. Further, in the third embodiment, the movable holder 1
0 and 101 are provided, and the end portions 61a and 61b of the torsion spring 61 are fitted into the hole portions 102 and 103.
A hole is provided on the side surface of the movable holder 1, and an end 61a is provided here.
61b may be fitted.

Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. This is also included in the present invention.

[0043]

According to the first aspect of the present invention, there is provided a light spot scanning control device, wherein a movable holder is floated on a base via a stretched spring member and is elastically supported, and is rotatable around the center of the movable holder. A turntable held in the turntable, focusing means provided on the turntable and located at a position eccentric from the rotation axis of the turntable at a predetermined distance, and a light beam provided on the turntable and passing through the rotation axis. A light beam deflecting means for guiding to the condensing means, a rotor magnet provided on the turntable, a stator having an armature coil provided on the movable holder so as to face the rotor magnet; Focusing control and tracking control of the light spot emitted from the light condensing means are provided with a minute gap between the base and Together comprising a light spot scanning control means for, when the light spot scanning control unit operation, and configured so as to be able to move the movable holder in the focusing direction and the tracking direction by the elastic deformation of the spring member. Since the light condensing means is configured to rotate integrally with the turntable, focusing control of the light spot and tracking control for the data track can be smoothly performed while rotating and scanning the light spot. Recording and reproduction can be performed, and the movable holder is stretched by a spring member, so that high-speed, high-precision recording and reproduction with quietness can be stably realized without increasing the natural frequency. Play.

According to a second aspect of the present invention, there is provided the light spot scanning control device according to the first aspect, wherein the light spot scanning control means includes a focusing control coil and a tracking control coil provided on the movable holder; The magnetic circuit comprises a permanent magnet and a yoke provided on the base for providing a linkage magnetic flux to the focusing control coil and the tracking control coil. For this reason, a control current corresponding to a focus shift or a track shift is applied to the focusing control coil and the tracking control coil, so that the movable holder is rotated in a non-contact manner with respect to the magnetic circuit, thereby recording and reproducing data tracks. The effect that can be performed smoothly is produced.

The third aspect of the present invention is the first or second aspect.
According to the optical spot scanning control device described above, while the spring member is formed by a leaf spring, a configuration in which a cutout portion is formed in the vicinity of the fixed portion to the base and in the vicinity of the fixed portion to the movable holder. Have. Since the movable holder is stretched by a leaf spring, the rigidity is low in a direction perpendicular to the plane of extension of the leaf spring. Therefore, either the focusing control or the tracking control is performed by utilizing the elastic displacement in the direction. Control, and the rigidity in the plane of the extension surface is increased. By forming a notch and constricting the leaf spring, either the focusing control or the tracking control can be performed smoothly. To play.

According to a fourth aspect of the present invention, there is provided the light spot scanning control device according to the third aspect, wherein the cutout portion of the leaf spring has a symmetrical shape with respect to a center line of the width of the leaf spring. Have. For this reason, even if tension is applied to the leaf spring, it is possible to prevent the leaf spring from being bent and deformed, so that there is an effect that stable recording and reproduction of data tracks can be realized.

The fifth aspect of the present invention provides the third or fourth aspect.
According to the optical spot scanning control device described above, a protruding portion is formed in the same plane as the leaf spring extension surface adjacent to the notch portion of the leaf spring, and the plate is formed in the vicinity including the notch portion. This is a configuration in which a damping agent for suppressing vibration of a spring is attached. With this configuration, rolling of the movable holder can be suppressed, and as a result, an effect can be achieved in which the focusing control operation or the tracking control operation can be performed accurately and smoothly.

According to a sixth aspect of the present invention, there is provided the optical spot scanning control device according to any one of the third to fifth aspects, wherein a hole is formed at both ends of the leaf spring on the center line of the width of the leaf spring. Is formed. For this reason, even if tension is applied to the leaf spring at the hole, the bending and deformation of the leaf spring can be suppressed, and an effect is achieved in which stable focusing control and tracking control can be performed.

According to a seventh aspect of the present invention, there is provided the optical spot scanning control device according to any one of the third to sixth aspects, wherein a fixing portion of the leaf spring to the base is the same as a leaf spring extension surface. It has a configuration in which a protrusion or a notch is formed in the plane. With this configuration, when the leaf spring is attached to the base fixing portion, the fixing can be easily performed, and the displacement in the tension applying direction is less likely to occur.

According to an eighth aspect of the present invention, there is provided the light spot scanning control device according to any one of the third to seventh aspects, wherein the spring member is formed of a conductive material while the movable holder is formed of the plate. After being fixed to the spring, the plate spring is cut in the vicinity of the substantially central portion in the extending direction, and the cut leaf spring is used as a feed line for the armature coil, the focusing control coil, and the tracking control coil. I do. By configuring the leaf spring as the power supply line in this manner, an effect of simplifying the wiring and wiring of the device is achieved.

According to a ninth aspect of the present invention, there is provided the light spot scanning control device according to any one of the first to eighth aspects, wherein the light spot scanning control device is formed in a U-shape between the movable holder and the base. A pair of free ends of the torsion spring are fitted into holes provided in the movable holder, and a connecting portion joining the pair is rotatably supported by the base. The rolling behavior of the movable holder is prevented by torsional deformation of the spring. With this configuration, even if rolling occurs in the movable holder, rolling can be suppressed by torsional deformation of the torsion spring, and consequently poor focusing or tracking control due to rolling behavior can be avoided. This has the effect that recording and reproduction can be performed.

[Brief description of the drawings]

FIG. 1 is a main part plan view of a light spot scanning control device according to a first embodiment of the present invention.

FIG. 2 is a front view of the apparatus shown in FIG.

FIG. 3 is an arrow A view of the apparatus shown in FIG. 1;

FIG. 4 is a cross-sectional view of a main part of the device shown in FIG. 1, including an optical card as an optical recording medium along line BB.

FIG. 5 is a plan view of a movable holder part of the apparatus shown in FIG.

FIG. 6 is a sectional view of a rotary scanning unit.

7 is a cross-sectional view of the device shown in FIG. 1, taken along line CC.

FIG. 8 is an enlarged plan view of a main part showing a leaf spring that elastically supports the movable holder.

FIG. 9 is an enlarged plan view showing a cutout portion and both end portions of the leaf spring.

FIG. 10 is a partially enlarged sectional view showing a method of attaching a ball bearing provided on a movable holder.

FIG. 11 is a diagram showing data tracks recorded on an optical card using the light spot scanning control device of the present invention.

FIG. 12 is a main part plan view showing a state where the light spot scanning control device is attached to a jig.

FIG. 13 is a front view of the state shown in FIG.

14 is a view as viewed in the direction of the arrow D in the state shown in FIG. 12;

FIG. 15 is a plan view of a movable holder portion of a light spot scanning control device according to a second embodiment of the present invention, from which a rotary scanning portion is omitted.

FIG. 16 is a plan view of a main part of a light spot scanning control device according to a third embodiment of the present invention.

17 is a front view of the device shown in FIG.

18 is a cross-sectional view of the device shown in FIG. 16 taken along line EE.

19 is a side view of the device shown in FIG.

20 is a side view of a main part of the device shown in FIG.

FIG. 21 is a side sectional view of a conventional device.

FIG. 22 is a plan view of a holding plate of the conventional device.

FIG. 23 is a plan view of a multipolar magnet.

FIG. 24 is a plan view of a coil group.

FIG. 25 is an explanatory diagram showing a relationship between an objective lens and laser light.

FIG. 26 is a plan view for explaining recording and reproduction of a recording track.

[Explanation of symbols]

Reference Signs List 1 movable holder, 4 turntable, 7 rotor magnet, 11 amateur coil, 12a, 12b focusing control coil, 13a-13d tracking control coil, 14 first reflection mirror, 15 second reflection mirror, 16 objective lens, 17 base, 22
a to 22d leaf spring, 220a to 220d center line of leaf spring, 221a to 221d protrusion, 222a to 222
d Notch, 224a-224d Projection, 225
a to 225d, protrusion, 228a to 228d hole,
229a-229d hole, 23a, 23b yoke,
24a 24d permanent magnet, 26 beams, 27 light spots, 61 torsion springs, 61a, 61b free ends of torsion springs, 61c connection.

Claims (9)

[Claims] 1. A movable holder that is floated on a base via a stretched spring member and elastically supported, a turntable rotatably held at a central portion of the movable holder, and a turntable provided on the turntable. Light condensing means located at a position eccentric from the rotation axis of the turntable by a predetermined distance; light beam deflecting means provided on the turntable for guiding a light beam passing through the rotation axis to the light condensing means; A rotor magnet provided on a table, a stator having an armature coil provided on the movable holder so as to face the rotor magnet, and a minute gap provided between the movable holder and the base; A light spot scanning control means for performing focusing control and tracking control of the light spot emitted from the light condensing means, and A light spot scanning control device, wherein the movable holder can be moved in a focus direction and a tracking direction by elastic deformation of the spring member when the light spot scanning control means is operated. 2. The light spot scanning control means according to claim 1, wherein said focusing control coil and tracking control coil provided on said movable holder are linked to said focusing control coil and tracking control coil provided on said base. 2. A magnetic circuit comprising a permanent magnet for providing a magnetic flux and a yoke.
The light spot scanning control device as described in the above. 3. A notch portion is formed near the fixed portion to the base and near the fixed portion to the movable holder, while the spring member is formed by a leaf spring. 3. The light spot scanning control device according to 1 or 2. 4. The notch of the leaf spring has a shape symmetric with respect to a center line of the width of the leaf spring.
The light spot scanning control device according to claim 3. 5. A protruding portion is formed adjacent to the notch portion of the leaf spring in the same plane as the plane where the leaf spring extends, and the vibration of the leaf spring is suppressed in the vicinity including the notch portion. 5. The light spot scanning control device according to claim 3, wherein a damping agent is attached. 6. A hole is formed at both ends of the leaf spring on the center line of the width of the leaf spring.
6. The light spot scanning control device according to any one of claims 1 to 5. 7. A fixing portion of the leaf spring to the base,
The light spot scanning control device according to any one of claims 3 to 6, wherein the projecting portion or the notch portion is formed in the same plane as the leaf spring extension surface. 8. While the spring member is formed of a conductive material, the movable holder is fixed to the leaf spring, and then the vicinity of the center of the leaf spring in the extension direction is cut. The light spot scanning control device according to any one of claims 3 to 7, wherein a feed line is provided for the armature coil, the focusing control coil, and the tracking control coil. 9. Between the movable holder and the base,
A torsion spring formed in a U-shape is provided, and a pair of free ends of the torsion spring facing each other are fitted into a hole provided in the movable holder, and a connecting portion joining the pair is rotatable with respect to the base. The light spot scanning control device according to any one of claims 1 to 8, wherein the movable holder is supported by the torsion spring to prevent rolling movement of the movable holder.