JP2003007033A - Disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively reduce the oscillation in the tracking direction of an optical disk in a unit base chassis. SOLUTION: An oscillation reducing mechanism 61 is provided for making a balancer 62 mounted on the unit base chassis 31 perform the pendulum swing in the θ direction which is the direction along the tracking direction (X direction).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention records and / or records information on a disc-shaped recording medium such as an optical disc or a magneto-optical disc.
In addition, the present invention relates to a disc drive device that is most suitable for being applied to an optical disc drive device for reproduction, and particularly to a technical field of a vibration reduction mechanism that reduces vibration of a chassis in which a recording / reproducing unit such as an optical pickup unit is mounted. Belong to.

[0002]

2. Description of the Related Art As is well known, an optical disk drive apparatus has a spindle motor mounted on a unit base chassis and an optical pickup unit as a recording / reproducing unit, and the spindle motor serves as a disk-shaped recording medium. While the optical disk is rotationally driven at high speed, the optical pickup unit tracks the optical disk while recording and / or reproducing (writing and / or reading) information on the optical disk. At this time, if the spindle motor may vibrate in the direction orthogonal to the axial direction due to the eccentricity of the optical disc itself or external vibration, the vibration is transmitted to the optical pickup unit via the unit base chassis and is then transmitted to the optical pickup unit. Also causes vibration. If a phase shift occurs between the vibration frequency of the spindle motor and the vibration frequency of the optical pickup, it adversely affects the tracking servo of the light beam focused on the optical disc by the objective lens of the optical pickup unit, resulting in an error in writing information on the optical disc and an error in writing. A read error will occur. Particularly, in a high-density optical disk such as a DVD (Digital Versatile Disk), the recording and / or reproducing performance of information is significantly deteriorated, which is a serious problem.

Therefore, some conventional optical disk drive devices are equipped with a vibration reducing mechanism for reducing the vibration of the unit base chassis caused by the eccentricity of the optical disk itself or external vibration. 27 and 28 show
1 shows a vibration reduction mechanism 201 called a "dynamic damper" used in a conventional optical disk drive apparatus. First, a front end portion 202a of a unit base chassis 202 called a BU chassis made of sheet metal or the like is shown.
A spindle motor 203 is mounted vertically in a substantially central portion of the disk table 204 which is rotated integrally with a spindle motor 203a of the spindle 203.
An optical disc D, which is a disc-shaped recording medium, is horizontally mounted on the upper side, and the optical disc D is rotationally driven at a high speed by a spindle motor 203. Then, an optical pickup unit 207, which is a recording / reproducing unit, is mounted in a substantially rectangular opening 206 formed between the front end 202a of the unit base chassis 202 and the rear end 202b. The optical pickup unit 207 has a sled 209 on which an objective lens 208 is mounted vertically upward.
09 is guided by two guide shafts 210 and 211 mounted in parallel to the lower surface of the unit base chassis 202 and the like, and is slid in the X direction, which is the tracking direction, by the sled drive mechanism 212, thereby rotating at high speed. A signal surface, which is the lower surface of the optical disc D, is tracked by a light beam converged by the objective lens 208 to record (write) and / or reproduce (read) information on the optical disc D. ing.

In the vibration reducing mechanism 210, first, a pair of left and right rubber insulators, which constitute first elastic members, are formed on the front end portion 202a and the rear end portion 202b of the unit base chassis 202, for a total of four rubber insulators. 213,
214 is attached vertically. Then, the rear end portion 202b of the unit base chassis 202 is mounted on the fixed main chassis 215 so as to have a pair of left and right insulators 214.
The front end portion 202a of the unit base chassis 202 is mounted on the lifting / lowering drive sub-chassis 216 which is vertically moved up and down.
It is installed through 3.

At the lower portion of the unit base chassis 202, a large plate-like weight plate 217 (having a size close to the outer diameter of the unit base chassis 202) of a flat plate shape made of sheet metal or the like is provided with a second elastic member. It is suspended in parallel with the unit base chassis 202 by the configured three to four rubber insulators 218. The plurality of insulators 213, 214 and 218 described above are used.
Are set screws 219, 220 and 22 with flanges, respectively.
1 by the main chassis 215, the sub chassis 216
Also, it is screwed to the unit base chassis 202.

In the vibration reduction mechanism 201, the unit base chassis 202 is constituted by the main chassis 215 and the sub-chassis 2 by the eccentricity of the optical disk D itself driven by the spindle motor 203 and external vibration.
For example, X1 and X2 which are tracking directions with respect to 16
The weight plate 217 at the X1,
X1 of the unit base chassis 202 is made to vibrate in the X11 and X12 directions which are opposite to the X2 direction,
The vibration in the X2 direction is canceled (reduced) by the mass of the weight plate 217.

[0007]

According to the conventional vibration reducing mechanism 201, the unit base chassis 202 is provided with respect to all directions of the X direction which is the tracking direction and the Y direction which is a direction orthogonal to the tracking direction. While the vibration can be reduced equivalently, the unit base chassis 202
In order to effectively reduce the vibration of the weight plate 217, it is necessary to set the mass of the weight plate 217 to be large enough to match the mass of the unit base chassis 202.
7, the vibration reduction mechanism 201 as a whole becomes large and heavy, which makes it difficult to reduce the size and weight of the entire optical disk drive device, and also increases the number of parts and the number of assembling steps to reduce the cost. There are problems such as inviting up.

The present invention has been invented to solve the above-mentioned problems. It is noted that the tendency of the disk drive device to be weak against vibration is almost fixed, and it is weak against the vibration. It is an object of the present invention to provide a product capable of improving the vibration reducing performance by mainly reducing the vibration in only the direction.

[0009]

In the disk drive device of the present invention for achieving the above object, a first chassis on which a spindle motor and a recording / reproducing unit are mounted is provided via a plurality of first elastic members. In a disk drive device mounted on a second chassis and equipped with a vibration reduction mechanism on the first chassis, a weight that is pendulum-moved around a rotation center and a weight that holds the weight at a midpoint of a pendulum movement range. The vibration reducing mechanism is configured by the two elastic members.

In the vibration reducing mechanism of the disk drive device of the present invention configured as described above, the first chassis is different from the second chassis due to the eccentric center of gravity of the disk-shaped recording medium itself which is rotationally driven by the spindle motor. And a plurality of first elastic members are vibrated in the tracking direction or the like against the second elastic members, the weight is pendularly moved around the center of rotation against the second elastic members, and the first chassis It acts to cancel the vibrations and reduces vibrations of the first chassis. When the weight makes a pendulum motion around the center of rotation, a large moment of inertia (rotation) is obtained, so a large weight reduction effect can be obtained with a weight having a small mass.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments to which the present invention is applied will be described below in the following order with reference to FIGS. (1) ... Description of first embodiment of vibration reduction mechanism (Figs. 1 to 9) (2) ... Description of second embodiment of vibration reduction mechanism (Fig. 10) (3) ... Description of third embodiment of vibration reduction mechanism (Fig. 11) (4) ... Description of fourth embodiment of vibration reduction mechanism (Figs. 12 and 13) (5) ... Description of the entire optical disk drive device (FIGS. 14 to 26)

(1) Description of First Embodiment of Vibration Reduction Mechanism First, referring to FIGS. 1 to 9, a vibration reduction mechanism referred to as a “dynamic damper” mounted on an optical disk drive device described later. The first embodiment will be described.
A spindle motor 32 is mounted vertically in a substantially central portion of a front end portion 31a of a unit base chassis 31 which is a BU chassis having a substantially rectangular planar shape which is a first chassis formed by sheet metal or the like. At the upper end of the spindle motor 32, a disk table 33 that is rotated integrally with the spindle 32a is horizontally provided. A substantially rectangular opening 34 is formed between the front and rear ends 31a and 31b of the unit base chassis 31, and an optical pickup unit 36 as a recording / reproducing unit is mounted in the opening 34. In this optical pickup unit 36, a sled 38, in which an objective lens 37 is vertically mounted, is parallel to a lower portion of a unit base chassis 31, and is slid along a horizontally mounted guide main shaft 39 and guide sub shaft 40. The moving mechanism 41 slides in the X direction, which is the tracking direction. The objective lens 37 is configured to slide in the X direction along the tracking path TR set on the center of the spindle motor 32, and the unit base chassis 31 has a substantially rectangular shape of the main chassis 2 described later. Is set in the large opening 17.

Then, the optical disk D, which is a disk-shaped recording medium, is attached to the disk table 33 of the spindle motor 32.
The optical disc D is vertically chucked upward, and while the optical disc D is rotationally driven at a high speed by the spindle motor 32, the objective lens 37 of the optical pickup unit 36 converges the light beam on the signal surface, which is the lower face of the optical disc D, and moves the sled. The mechanism 41 guides the sled 38 by the main guide shaft 39 and the sub guide shaft 40, and slides it in the X direction, which is the tracking direction, so that the light beam focused on the signal surface of the optical disc D by the objective lens 37 is moved to the X direction. Information is recorded on and / or reproduced from the optical disc D by seeking in the direction.

By the way, in the optical disk drive device,
The direction of vibration generated in the unit base chassis 31 due to the eccentricity of the optical disk D itself (= direction weak against vibration) is concentrated in the X direction, which is the tracking direction. Therefore, in the first embodiment of the vibration reduction mechanism 61, the vibration of the unit base chassis 31 in the X direction can be intensively reduced (damped).

That is, first, the unit base chassis 31
A pair of left and right on both left and right sides of the rear end portion 31b and the front end portion 31a, which is an insulator against a total of four vibrations, and is a hollow cylindrical shape by an elastic member such as rubber constituting the first elastic member, Insulators 47 and 48 formed in a substantially dharma shape (a hollow cylindrical shape and a two-tiered spherical shape) are mounted vertically, and the rear end portion 31b of the unit base chassis 31 is the second chassis, which will be described later. On the main chassis 2, it is screwed onto the rear position of the opening 7 by a pair of left and right set screws 49 via a pair of left and right insulators 47 on the rear side. Further, the front end portion 31a of the unit base chassis 31 is mounted on a lift drive frame 121, which will be described later, which corresponds to a sub chassis of the second chassis, via a pair of left and right insulators 48, and a pair of left and right set screws 5.
It is screwed by 0. Therefore, the unit base chassis 31, which is the first chassis, is mounted on the second chassis, which is composed of the main chassis 2 and the elevating and lowering drive frame 121, while being elastically supported via a total of four insulators 47 and 48. ing.

Next, in the first embodiment of the vibration reducing mechanism 61, the vibration reducing mechanism 61 has a predetermined rotation radius r around a rotation center P, which will be described later, and is in one tracking direction (X direction). A balancer 62 that is a weight that is pendulum-moved along the θ direction, and a pair of left and right insulators 63 that are second elastic members formed of rubber or the like that holds the balancer 62 at the midpoint θ0 of the pendulum movement range. Is equipped with.
Then, a vibration reduction mechanism 61 using this balancer 62
Are mounted in an effective space substantially above the center of the rear end 31b of the unit base chassis 31.

The balancer 62 can be formed by sheet metal or the like, and is, for example, a horizontal, elongated base portion 62a and the width direction (X direction) of the base portion 62a.
Of the pair of rising portions 62b vertically rising from both sides of the pair of rising portions and the lengthwise direction of the pair of rising portions 62b (Y
Direction), and a pair of horizontal portions 62c having a small width, which are horizontally bent inward from the central portion, and the pair of horizontal portions 62c.
It is possible to configure by a pair of vertically standing downwards from both sides of the lengthwise direction of the c (Y direction), a total of four falling portions 62d and the like.

Then, the base portion 6 of the balancer 62.
A pair of left and right circular-hole-shaped insulator fitting holes 64 are opened at both left and right ends in the length direction of 2a through outer notches 65 on both the left and right sides. A pair of left and right inner notches 65 are also formed inside the pair of left and right insulator fitting holes 64. The pair of left and right insulators 63 has a hollow cylindrical shape that is substantially the same as the insulators 47 and 48 described above, and is formed in a substantially dalma shape (a hollow cylindrical shape and two upper and lower spherical shapes). The insulator 63 is composed of an outer annular recess 62c formed on the outer side between the upper and lower spherical portions 62a and 62b.
Pair of left and right insulator fitting holes 6 in the base portion 62a of the
4 are fitted through the outer cutouts 65 on the left and right sides, and the rotation preventing ribs 63d integrally formed inside the annular recesses 63c are engaged in the left and right inner cutouts 66 to form a balancer. A pair of left and right insulators 63 are prevented from rotating with respect to 62.

The balancer 62 is provided with a pair of left and right via a pair of left and right insulators 63 at a position above the rear end 31b of the unit base chassis 31 on the side opposite to the spindle motor 32. It is mounted by a set screw 67. At this time, the length direction (Y direction) of the balancer 62 is directed to the direction orthogonal to the X direction which is the tracking direction by the objective lens 37 of the optical pickup unit 36 described above, and the center of the balancer 62 in the length direction. The position is set on the tracking path TR by the objective lens 37 or a position in the vicinity thereof. By the way, as shown in FIG. 7, the balancer 62 has a length L = about 43 mm, a width W = about 22 mm, and a height H (however, the height of the horizontal portion 62c) = about 9.2 mm. The horizontal portion 62c has a length L1 of about 20 mm.

A so-called stepped screw is used for the pair of left and right setscrews 67, and a small diameter screw shaft portion 67a at the lower end is formed above the pair of left and right female screw holes 68 formed in the unit base chassis 31. From the large-diameter shaft portion 6 above the pair of left and right set screws 67.
7b is vertically inserted into the hollow portions 63e of the pair of left and right insulators 63, and a horizontal inner annular rib 63f integrally formed inside the outer annular recessed portions 63c of the pair of left and right insulators 63 has a large diameter shaft. The pair of left and right set screws 67 are supported by the outer periphery of the upper and lower intermediate portions of the outer periphery of the portion 67b.
The upper end of the upper spherical portion 63a of the pair of left and right insulators 63 is attached from above by the flange portion 67c at the upper end of the.

Therefore, as shown in FIGS. 1 and 2, in the balancer 62, the circular holes 64 at the left and right ends of the base portion 62a are provided between the upper and lower spherical portions 63a and 63b of the pair of left and right insulators 63. And is elastically sandwiched between and supported horizontally on the unit base chassis 31. Then, the unit base chassis 31 is inserted into the hollow portions 63e of the pair of left and right insulators 63.
A pair of left and right setscrews 67 fixed vertically above the balancer 62 regulates the movement of the balancer 62 in the length direction (Y direction) on the unit base chassis 31.

As a result, the intersection of the vertical center line P1 of the pair of left and right setscrews 67 and the center line P2 of the plate thickness of the base portion 62a orthogonal thereto is the center of rotation P of the balancer 62.
The center of gravity G of the balancer 62 is set at the center in the lengthwise direction (Y direction) and at a position higher than the rotation center P by a predetermined rotation radius r.
The center of gravity G of the balancer 62 is the center of rotation P.
The turning radius r around the pendulum is configured so as to make a pendulum motion against the elasticity of the pair of left and right insulators 63 in the θ direction along the tracking path TR, and the pair of left and right insulators 63 has a center of gravity of the balancer 62. The position G is configured to be held at the midpoint θ0 of the pendulum movement range in the θ direction.

The vibration reducing mechanism 61 constructed as described above.
According to the first embodiment, the optical disc D having the eccentric center of gravity is chucked on the disc table 33,
When the spindle motor 32 is rotationally driven at a high speed, the unit base chassis 31 resists the elasticity of the four insulators 47, 48 with respect to the main chassis 2 and the like (and the lifting drive frame 121) in the X direction, which is the tracking direction. Vibrate. Then, the balancer 62 of the vibration reduction mechanism 61 makes a pendulum motion in the θ direction against the elasticity of the pair of left and right insulators 63, and the vibration of the unit base chassis 31 in the X direction is reduced. In other words, the unit base chassis 31 is X relative to the main chassis 2 etc.
The balancer 62 is a reaction when it is vibrated in the X1 and X2 directions.
Is pendulum-moved in the θ1 and θ2 directions, which are opposite to the X1 and X2 directions, and the X of the unit base chassis 31 is moved.
It is reduced (damped) so as to cancel the vibrations in the 1st and 2nd directions.

Therefore, the balancer 62 can efficiently reduce (attenuate) the vibration of the unit base chassis 31 only in the specified direction, that is, the tracking direction (X direction).

Moreover, in the case of the balancer 62 that vibrates in the θ direction due to the pendulum motion, its vibration energy and resonance frequency are not limited to the mass of the balancer 62 and the spring constant of the pair of left and right insulators 63, but also to the center of rotation (vibration center). ) Since it also depends on the inertia (rotation) moment of the turning radius r around P, even if the mass of the balancer 62 is reduced, the height of the center of gravity position G (= turning radius r) is arbitrarily set. This balancer 62
The inertial (rotational) moment of can be set arbitrarily large.

Further, the center of gravity position G of the balancer 62 is pendulum-moved in the θ direction along the position on or near the tracking path TR, so that even if the mass of the balancer 62 is small, the tracking direction of the unit base chassis 31 ( The vibration in the X direction can be reduced (damped) most efficiently.

As described above, the balancer 62 having a small mass
Can be used to extremely efficiently reduce (attenuate) the vibration of the unit base chassis 31 in the tracking direction (X direction) that is the specified direction, and by reducing the mass of the balancer 62, It is possible to promote size reduction, weight reduction, and cost reduction of the optical disk drive device 1 described later.

8 and 9 show the vibration reducing mechanism 61.
The unit base chassis 31 according to the first embodiment of
2 is a graph showing experimental data obtained by measuring the vibration damping (reducing) effect of the optical disk D in this experiment, when the optical disk D having an eccentric center of gravity of 0.3 is rotationally driven by the spindle motor 32. Is measured. Note that FIG. 8 shows experimental data in the case of the optical disc drive device 1 for 40 times, and the insulator 63 is X40 having a high hardness. Further, FIG. 9 shows experimental data in the case of the optical disk drive device 1 for 32 times, and X32 having a soft hardness is used for the insulator 63.

In the experimental data of FIGS. 8 and 9, the horizontal axis represents the rotation speed of the spindle motor 32, and the vertical axis represents the vibration output of the unit base chassis 31. The measured value A indicates the vibration value of the unit base chassis 31 on which the vibration reduction mechanism 61 is not mounted, and the measured value B indicates the vibration value of the unit base chassis 31 on which the vibration reduction mechanism 61 using the balancer 62 is mounted. The vibration value is shown. The measured value C represents the vibration reduction effect of the unit base chassis 31 attenuated by the measured value B.

Therefore, as is clear from the experimental data of FIGS. 8 and 9, the vibration reduction mechanism 61 using the balancer 62 is mounted on the unit base chassis 31 in both the 40 × and 32 × optical disc drive devices 1. By mounting it, the vibration of the unit base chassis 31 was able to be damped to about 1/2. That is, the vibration of the unit base chassis 31 is attenuated from about 3,500 V to about 1,700 V near the rotational speed indicated by X40 in FIG. 8 = about 8,500 rpm, and the rotational speed indicated by X32 in FIG. 9 = 6. Unit base chassis 3 near 700 rpm
1 vibration was attenuated from about 2,200V to about 1,400V.

(2) Description of Second Embodiment of Vibration Reduction Mechanism Next, a second embodiment of the vibration reduction mechanism will be described with reference to FIG. The vibration reduction mechanism 61 in this case is
The balancer 62 is attached to the unit base chassis 31 by a fulcrum shaft 70 so as to allow pendulum movement in the θ direction, and the pair of tension coil springs 71, which are second elastic members, attaches the balancer 62 to the midpoint of the pendulum movement range in the θ direction.
It is designed to be held at 0. Also, according to the second embodiment of the vibration reduction mechanism 61, the same vibration reduction (damping) effect as in the above-described first embodiment can be obtained.

(3) Description of Third Embodiment of Vibration Reduction Mechanism Next, referring to FIG. 11, a third embodiment of the vibration reduction mechanism 61 will be described. In this case, as described above. Further, the vibration reduction mechanism 61 using the balancer 62 is mounted on the rear end portion 31b of the unit base chassis 31, and the balancer 62 is pendulum-moved in the θX direction to track the unit base chassis 31 in the tracking direction (X direction).
Vibration of the machine is reduced (damped) and a small balancer 6
A small vibration reducing mechanism 61A using 2A is mounted on the upper part of either or both of the left and right side parts 31c and 31d of the unit base chassis 31, and the small balancer 6 is installed.
2A is pendulum-moved in the θY direction, which is the direction (Y direction) orthogonal to the tracking direction (X direction), so that Y due to external vibration of the unit base chassis 31 is generated.
The vibration in the direction can also be reduced (damped).

(4) Description of Fourth Embodiment of Vibration Reduction Mechanism Next, referring to FIGS. 12 and 13, a fourth embodiment of the vibration reduction mechanism 61 will be described. In this case, The balancer 62 is formed in a cylindrical shape by a disk-shaped base portion 62a and a cylindrical rising portion 62b that is vertically raised from the entire circumference of the base portion 62a. Then, a concentric partial spherical surface portion (shape corresponding to a part of the spherical surface) 62e is formed in a convex shape upward in the center of the base portion 62a, and a circular portion is formed in the central portion of the partial spherical upper portion 62e. An insulator fitting hole 64 is formed. Further, one insulator 63 formed in a hollow cylindrical shape and having a substantially Dharma shape (a hollow cylindrical shape and two upper and lower spherical shapes) is used, and between the upper and lower two spherical sections 63a and 63b of the insulator 63. Outer annular recess 63c
Is fitted into the insulator fitting hole 64 of the balancer 62, and the balancer 62 is inserted vertically into the hollow portion 63e of the insulator 63 from above from the balancer 62 in the same manner as described above. It is attached on the tracking path TR of the portion 31b or in the vicinity thereof.

At this time, the central spherical surface portion 62e of the base portion 62a of the balancer 62 is placed on the upper spherical surface 63b1 of the lower spherical portion 63b of the insulator 63.
Since the partial spherical surface 62e1 on the lower surface of the is stably mounted, the center of the cylindrical balancer 62 is stably supported on the vertical center line P1 of the set screw 67. And
The balancer 62 has a center of rotation P at the intersection of its centerline P1 and a centerline P2 of the plate thickness in the insulator fitting hole 64 of the base portion 62a orthogonal to the centerline P1, and the θX direction which is the tracking direction, and The pendulum can be moved in two directions, that is, the θY direction which is orthogonal to the direction.

Therefore, according to the fourth embodiment of the vibration reducing mechanism 61, the vibration in the tracking direction (X direction) of the unit base chassis 31 is caused by θX of the balancer 62.
The pendulum motion in the direction reduces (attenuates) the vibration of the unit base chassis 31 in the direction (Y direction) orthogonal to the tracking direction, and the balancer 62 θY.
Can be reduced (damped) by the pendulum motion in the direction, and the vibration of the unit base chassis 31 can be equivalently reduced (damped) in all the rotation directions of the optical disc D.
In particular, a high vibration reduction effect against external vibration can be obtained.

(5) Description of Entire Optical Disk Drive Device Next, the entire optical disk drive device will be described with reference to FIGS. 14 to 26. First, as shown in FIG. 14, FIG. 15 and FIG. 26, the optical disc drive device 1 is a flat box type that includes a main chassis 2, a front panel 3 and an upper cover 4. Drive device main body 5 is configured, and the optical disc D is an optical disc drive device by a disc tray 7 that is horizontally inserted and removed in the directions of arrows a and b from a tray inlet / outlet 6 that is a horizontally long opening formed on the upper side of the front panel 3. 1 is configured to be loaded and unloaded. And front panel 3
On the lower side of the card, there is an insertion slot 8 for a card-type recording medium that has a built-in flash memory such as a memory stick (a product name of Sony Corporation), an eject button 9, a volume 10, a headphone jack 11, and an emergency eject pin insertion hole. 12, an operating state display LED (light emitting diode) 13, and the like are arranged.

Then, as shown in FIG. 15, the main chassis 2 is formed by pressing a metal plate such as an iron plate.
The main chassis 2 includes a horizontal wall portion 2a, a pair of left and right vertical wall portions 2b and a rear end side vertical wall portion 2c that are vertically raised from the left and right sides and the rear end of the horizontal wall portion 2a.
And the front end side of the horizontal wall portion 2a is the open portion 1
Opened by 6. And the horizontal wall portion 2a
A large rectangular opening 17 is formed substantially at the center. In addition, a plurality of stand portions 2d that are hung down from the outer periphery of the horizontal wall portion 2a are also provided.

The units and parts incorporated in the main chassis 2 include a loading gear unit 101, a slide frame 111, a lift drive frame 121, an optical pickup unit 36, a disc clamper unit 171 and the like. The unit base chassis 31 and the disk clamper support frame 172 of the disk clamper unit 171 which are the mounting frames for the slide frame 111, the lifting drive frame 121, the spindle motor 32, and the optical pickup unit 36, and also the lifting frame are the main chassis 2. It is pressed by sheet metal such as an iron plate.

Here, the order of assembling the optical disk drive device 1 will be described. First, as shown in FIGS. 15 and 16, first, the loading is performed at the mounting position P11 on the front end side of the opening 17 of the horizontal wall portion 2a of the main chassis 2. Fit the gear unit 101 from above. At this time, the loading gear unit 101 outputs an input pulley 102, a geared pulley 104 linked to the input pulley 102 via a rubber belt 103, an intermediate gear 105 that is a reduction gear linked to the geared pulley 104, and an output. The input gear 102, the geared pulley 104, the intermediate gear 105, and the output gear 106 are vertically arranged on the mounting position P11 on the horizontal wall portion 2a of the chassis 82. Motor shaft 1 attached
07 and three support shafts 109 are fitted so as to be inserted from above. The motor shaft 107 is a motor shaft of a loading motor 108 screwed to the lower portion of the horizontal wall 2a.

Next, as shown in FIGS. 16 to 21, the slide frame 111 is attached to the loading gear unit 101.
Is inserted into the upper part of the main chassis 2 from above, and a part thereof is inserted into the front end side in the opening 17 of the main chassis 2. At this time, the slide frame 111 has an L-shaped side surface formed by the horizontal plate portion 111a and the vertical plate portion 11b vertically bent downward from the rear end of the horizontal plate portion 111a. Therefore, the horizontal plate portion 1 of this slide frame 111
The two guide grooves 112 and the one retaining groove 113 formed in 11a are used as the loading gear unit 1.
No. 01 geared pulley 104 and two support shafts 109 of the intermediate gear 105 and the upper end of the retaining guide column 114 vertically rising from the horizontal wall 2a are fitted to the vertical plate portion. 111b is vertically inserted into the front end of the opening 17. Then, this slide frame 111 has 2
It is horizontally supported by the upper end portions of the book support shaft 109 and one retaining column 113, and is a horizontal direction perpendicular to the arrow a and b directions that are the loading and unloading directions of the disc tray 87. It is assembled so that it can slide horizontally in the directions of arrows e and f. Then, the rack 117 integrally pressed on the front surface on one end side of the vertical plate portion 111b of the slide frame 111 can mesh with the lower gear of the output gear 106 of the loading gear unit 101.

Next, as shown in FIGS. 17 to 21, the raising / lowering drive frame 121 is fitted into the mounting position P12 on the front end side of the opening 17, and the raising / lowering drive frame 121 is vertically attached to the chassis 82. The slide frame 111 is mounted so as to be rotatable in the g and h directions, and is connected so that the elevating and lowering drive frame 121 can be driven in the arrow g and h directions. At this time, the lifting drive frame 121
Is a horizontal plate portion 121a and left and right side arm portions 1 extending rearward in parallel from the left and right sides of the horizontal plate portion 121a.
21b and a front end edge portion 121c vertically rising upward from the front end of the horizontal plate portion 121a and having a low height form a planar U-shape. And
A pair of left and right fulcrum pins 122 and a guide pin 123, which are arranged at the same center, are horizontally projected on the left and right sides of the rear end portion of the left and right side arm portions 121b and on the left and right sides of the front end side. A pair of left and right cam follower pins 124 are horizontally provided on the front surface of the front edge 121c.

Therefore, the pair of left and right fulcrum pins 122 and the guide pins 123 are formed on the pair of left and right inner vertical wall portions 2e vertically rising from both the left and right sides of the opening 17 of the main chassis 2. The lifting drive frame 121 is fitted in the pair of left and right fulcrum pin fitting holes 125 and the pair of left and right arcuate guide grooves 126, and the up-and-down drive frame 121 is vertically arranged around the pair of left and right fulcrum pins 122 in the main chassis 2. It is attached so that it can rotate in the h direction. Then, after this, a pair of left and right cam follower pins 124 are notched upward from upper ends 115a of a pair of left and right substantially Z-shaped cam grooves 115 formed in the vertical plate portion 111b of the slide frame 111. Notch part for inserting and removing pin 116
Through the upper ends 115 of the pair of left and right cam grooves 115.
Insert into a.

Then, the pair of left and right cam follower pins 124 are moved by the sliding movement of the slide frame 111 in the directions of the arrows e and f so that the upper end portions 115 a of the pair of left and right cam grooves 115.
And the intermediate inclined portion 115b and the lower end portion 115c are driven to move up and down in the directions of arrows g and h.
The slide frame 111 and the elevating and lowering drive frame 121 are connected to each other so that 21 is driven up and down in the directions of the arrows g and h in the opening 17 about the pair of left and right fulcrum pins 122.

At this time, the pair of left and right inner vertical wall portions 2e of the main chassis 2 form a pair of left and right fulcrum pin fitting holes 1.
A pair of left and right elastic arm portions 127 are integrally formed in a horizontal shape at the upper position of the open portion 125a of 25. Then, as shown in FIG. 29, when the pair of left and right fulcrum pins 122 are inserted into the pair of left and right fulcrum pin fitting holes 125 from the opening 125a in the direction of the arrow i, which is an oblique direction, the pair of left and right elastic arm portions are inserted. The arrow j, at which 127 is upward once against elasticity,
After escaping in the direction, the pair of left and right fulcrum pins 122 are completely inserted into the pair of left and right fulcrum pin fitting holes 125, and the pair of left and right elastic arm portions 127 elastically restore in the downward arrow k direction, Thereafter, the pair of left and right fulcrum pins 122 is configured to be prohibited from being accidentally pulled out obliquely upward (in the direction opposite to the arrow k) from the opening 125a. Therefore,
The pair of left and right fulcrum pins 122 are connected to the pair of left and right elastic arm portions 1.
The workability of assembling is remarkably improved because it can be inserted and supported rotatably in the pair of left and right fulcrum pin fitting holes 125 against the elasticity of 27 with a click feeling.

Next, as shown in FIGS. 22 and 23, the unit base chassis 3 of the optical pickup unit 36.
A pair of left and right pairs formed on both left and right side portions of the front and rear end portions 36a and 36b of the first insulator fitting portion 1 in total
32c (see FIG. 4) has a pair of left and right, respectively, four hollow cylinders in total, and intermediate portions of the insulators 47 and 48 made of rubber or the like having a substantially dharma shape are fitted vertically. Then, a pair of left and right setscrews 149 inserted from above into the centers of the pair of left and right insulators 47 on the rear end side are screwed into the upper portion on the rear end side of the opening 17 of the horizontal wall portion 2a of the main chassis 2 from above. As a result, the rear end portion 31b of the unit base chassis 31 is attached to the upper portion on the rear end side of the horizontal wall portion 2a of the main chassis 2 via the pair of left and right insulators 47. In addition, a pair of left and right setscrews 50 that are inserted from above in the center of the pair of left and right insulators 48 on the front end side are installed on the horizontal plate portion 12 of the elevating and lowering drive frame 121.
The front end portion 31a of the unit base chassis 31 is attached to the upper portion of the elevating drive frame 121 via a pair of left and right insulators 48 so that the front end portion 31a of the unit base chassis 31 can be screwed and attached from above.

From the above, the optical pickup unit 36
At the upper position P13 of the opening 17 of the main chassis 2 so as to straddle between the rear end side of the horizontal wall 2a of the main chassis 2 and the upper part of the elevating and lowering drive frame 121, a total of four insulators 47, 48. Attached through. Then, the unit base chassis 31 uses the pair of left and right insulators 47 on the rear end side as the fulcrum for the vertical drive of the vertical drive frame 121 in the directions of arrows g and h, and the lower position in the direction of arrow d and the direction of arrow c. Assembling is completed so that it can be moved up and down by a swing motion between the upper and lower positions.

Next, as shown in FIGS. 23 and 24, the disc tray 7 is horizontally inserted from the front open portion 16 of the main chassis 2 into the left and right side positions P14 above the horizontal wall portion 2a from the direction of arrow a. To install. At this time, the disc tray 7 is formed of synthetic resin, and a vertical and oblong tray front panel 7b is integrally formed on the front end of the horizontal tray body 7a. A substantially circular recess 7c is formed in the upper portion of the tray body 7a on the front end side, and a large slot is formed along the tray center from the center of the recess 7c toward the rear end 7d. A bottom surface opening 7e is formed. Further, the rear end portion 7d has a cutout portion 7f for escaping the sled drive motor 142 of the sled moving mechanism 41, and a cutout portion for escaping the balancer 62 in the first embodiment of the vibration reduction mechanism 61 described above. 7i are formed. The tray body 7a is formed in a shallow, generally U-shaped cross-section in a direction perpendicular to the front-rear direction (directions of arrows a and b). A pair of left and right parallel guide rails 7g are integrally formed along the. Further, the loading gear unit 10 is placed at a position offset to the other side of the lower surface of the tray body 7a.
A linear rack 7h meshed with the upper gear of the first output gear 106 is integrally formed in parallel with the directions of the arrows a and b.

Therefore, the pair of left and right guide rails 7g of the disc tray 7 are disposed inside the pair of left and right vertical wall portions 2b of the main chassis 2 and on both left and right side positions P1 of the horizontal wall portion 2a.
4 is inserted horizontally in the direction of arrow a. Then, the pair of left and right guide rails 7g are horizontally inserted along the lower end sides of the inside of the pair of left and right vertical wall portions 2b into the lower portions of the plurality of tray pressing portions 2f which are horizontally punched.
The tray body 7a is horizontally inserted in the main chassis 2 in the direction of arrow a so as to be attached so as to straddle the upper portions of the loading gear unit 101 and the slide frame 111 in the left-right direction. An elastic stopper 7i integrally formed on the lower surface of one side of the tray body 7a resists the elasticity of the stopper 118 protruding from the upper portion of one side of the slide frame 111 and is indicated by an arrow. The stoppers 7i and 118 abut against each other to prevent the disc tray 7 from accidentally coming out of the inside of the main chassis 2 in the direction of the arrow b after getting over in the direction a. Then, the rack 7h on the lower surface of the disc tray 7 inserted in the main chassis 2 from the direction of the arrow a is meshed with the upper gear of the output gear 106 of the loading gear unit 101.

Next, as shown in FIGS. 24 and 25, the discs are mounted on the pair of left and right disc clamper unit mounting portions 2g which are horizontally bent on the pair of left and right vertical wall portions 2b. The left and right end portions 172a of the disc clamper support frame 172 of the clamper unit 171 are horizontally placed, and the pair of left and right positioning pins 173 and the set screws 174 are used for positioning and screwing. Then, a disk-shaped disk clamper 1 molded of synthetic resin in a circular recess 175 formed in the center of the disk clamper support frame 172.
76 is inserted in a playable state, and a disc clamp portion 177, which is a circular convex portion protruding from the central portion of the disc clamper 176, is provided with a circular hole 178 formed in a concentric circular shape at the center of the circular recess 175. When the flange portion 179 formed on the outer circumference of the upper end of the disc clamper 176 is horizontally placed in the circular recess 175, the disc clamper 176 is inserted into the optical pickup unit 36. The spindle motor is installed horizontally above the spindle motor with play. A ring-shaped magnet 180 is concentrically embedded above the disc clamp portion 177 of the disc clamper 176.

Then, as shown in FIG. 26, a pair of left and right vertical wall portions of the main chassis 2 is attached to the upper cover 4 which is pressed downward with a sheet metal such as an iron plate in a substantially U-shape. 2b and the vertical wall 2c on the rear end side, the upper cover 4 is fitted into the main chassis 2 from above so as to cover the outside, and a plurality of locking portions 4a formed inside the upper cover 4 are attached to the main chassis 2. The elasticity of the upper cover 4 is used to fit into a plurality of locking portions 2i formed on the rear side of the three vertical wall portions 2b and 2c in total of the chassis 2. And finally,
As shown in FIG. 23, the front panel 3 is fitted outside the front end portions of the pair of left and right vertical wall portions 2b of the main chassis 2 and the U-shaped front end portions of the upper cover 4 to form a plurality of locking portions ( If it is locked by (not shown), the assembling work of the optical disk drive device 1 shown in FIG. 14 is completed.

By the way, this optical disk drive device 1
When loading the optical disc D, the optical disc D is placed horizontally in the recess 7c of the disc tray 7 that is unloaded outside the optical disc drive device 1 in the direction of arrow b. Then, when the tray front panel 7b of the disc tray 7 is lightly pushed in the direction of arrow a, the loading switch is turned on and the loading motor 108
Is driven to rotate in the normal direction, and the output gear 106 of the loading gear unit 101 is driven to rotate in the normal direction. Then, the rack 7h of the disc tray 7 is driven by the upper gear of the output gear 106, the disc tray 7 is loaded in the direction of the arrow a in the optical disc drive device 1, and the optical disc D is taken into the optical disc drive device 1. .

When the loading of the disc tray 7 is completed, the upper gear of the output gear 106 is moved to the rack 7
The disc tray 7 is positioned at the loading completion position by the positioning means (not shown) without moving from h, and the lower gear of the output gear 106 is moved to the rack of the slide frame 111 by the forward rotation of the output gear 106. By engaging with 117, the slide frame 111 is slid in the direction of arrow e from the position indicated by the alternate long and short dash line in FIG. 20 to the position indicated by the solid line.

Then, the pair of left and right cam grooves 112 of the slide frame 111 drive the pair of left and right cam follower pins 124 of the elevating and lowering drive frame 121 upwardly in the direction of arrow g from the position shown by the one-dot chain line in FIG. 20 to the position shown by the solid line. As a result, the lifting drive frame 121 moves the pair of left and right fulcrum pins 12
19, the unit base chassis 31 is rotationally driven in the direction of arrow g from the position shown by the alternate long and short dash line to the position shown by the solid line in FIG.
21 is raised in the direction of arrow c from the lowered position shown by the dotted line in FIG. 21 to the raised position shown by the solid line, and the optical disc D is chucked by the disc clamper 176 on the disc table 33 of the spindle motor 32. , The optical disc D is the recess 7c of the disc tray 7.
Is levitated horizontally above. Then, at this point, the loading motor 108 is automatically stopped.

Then, a recording and / or reproducing command signal is inputted from the host computer, and the optical disc D is rotationally driven by a spindle motor 32 described later,
The optical pickup unit 36 records and / or reproduces information on the optical disc D.

Recording of information on the optical disc D and / or
Alternatively, when the eject button 9 is pressed after the end of the reproduction, the loading motor 108 is driven in the reverse rotation, and the output gear 106 of the loading gear unit 101 is driven in the reverse rotation. Then, by the reverse operation at the time of loading, the slide frame 111 is slid in the arrow f direction from the position shown by the solid line in FIG. 20 to the position shown by the alternate long and short dash line, and the lift drive frame 121 is moved from the position shown by the solid line in FIG. The unit base chassis 31 is driven to rotate in the direction of arrow h to the position indicated by the alternate long and short dash line, and is driven downward in the direction of arrow d from the raised position shown by the solid line in FIG. 21 to the lowered position shown by the dotted line. 33 is the disk clamper 1
The optical disc D is detached downward from 76 and placed in the recess 7 c of the disc tray 7. Then, after this, the disc tray 7 is unloaded in the direction of the arrow b, and the optical disc D is taken out of the optical disc drive apparatus 1.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention. In the above-described embodiment, the vibration reduction mechanism 6
1 was mounted on the top of the unit base chassis 31,
It is also possible to mount the unit base chassis 31 on the lower side by a suspension method.

[0057]

The disk drive device of the present invention configured as described above can achieve the following effects.

According to another aspect of the vibration reducing mechanism of the present invention, the first chassis resists the plurality of first elastic members against the second chassis due to the eccentric center of gravity of the disk-shaped recording medium itself which is rotationally driven by the spindle motor. Then, in response to the vibration in the tracking direction or the like, the weight is pendulum-moved around the rotation center against the second elastic member, and acts to cancel the vibration of the first chassis. Since the vibration of the chassis is reduced, the large inertia (rotation) moment generated when the weight makes a pendulum motion around the center of rotation can be effectively used to obtain a large vibration reduction effect with a weight with a small mass. The size of the vibration reduction mechanism can be reduced, the weight can be reduced, and the cost can be reduced. The high-precision recording and / or reproduction of a high-density recording disk-shaped recording medium such as a DVD can be achieved. Lightweight, and it is possible to realize a low-cost, high-performance disk drive apparatus.

The vibration reducing mechanism according to claim 2 and claim 3
Since the pendulum movement direction of the weight is set to the tracking direction of the disk-shaped recording medium, and the weight is mounted at the position opposite to the spindle motor of the recording / reproducing unit on the tracking path of the disk-shaped recording medium or in the vicinity thereof, The specified vibration in the tracking direction in the first chassis can be reduced intensively, and the vibration reduction performance can be significantly improved.

According to a fourth aspect of the present invention, there is provided a vibration reducing mechanism in which a plurality of weights that are pendulum-moved effectively cause vibrations in the tracking direction of the disk-shaped recording medium and in all directions that are orthogonal to the tracking direction by the pendulum movements of the plurality of weights. It can be reduced.

According to the vibration reducing mechanism of the fifth aspect, since one weight can be pendulum-moved in both the tracking direction of the disk-shaped recording medium and the direction orthogonal to it, the first weight is reduced by the weight. It is possible to reduce the vibration of the chassis in all directions, and it is possible to further improve the size and weight reduction of the disk drive device by reducing the weight and space.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire unit base chassis showing a first embodiment of a vibration reduction mechanism of an optical disk drive device to which the present invention is applied.

FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG. 3 showing an enlarged balancer portion of the vibration reduction mechanism of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a side view taken along the line BB of FIG.

5 is a side view taken along the line CC of FIG.

FIG. 6 is a perspective view of the above balancer.

FIG. 7 is a plan view of the above balancer and a partially cutaway side view of the plan view taken along the arrow DD.

FIG. 8 is data obtained by measuring the vibration reduction effect of the unit base chassis in the 40 × optical disk drive device using the above balancer.

FIG. 9 is data obtained by measuring the vibration reduction effect of the unit base chassis in a 32 × optical disk drive device using the above balancer.

FIG. 10 is a partially cutaway side view showing a second embodiment of the vibration reducing mechanism of the above.

FIG. 11 is a plan view showing a third embodiment of the vibration reduction mechanism of the above.

FIG. 12 is a partially cutaway side view showing a fourth embodiment of the vibration reducing mechanism of the above.

FIG. 13 is a plan view of FIG.

FIG. 14 is a perspective view of the entire optical disk drive device.

FIG. 15 is an exploded perspective view for explaining the assembling of the loading gear unit of the above optical disk drive device.

FIG. 16 is an exploded perspective view for explaining the assembling of the slide frame of the optical disc drive device of the above.

FIG. 17 is an exploded perspective view for explaining the assembling of the lifting drive frame of the optical disk drive device of the above.

FIG. 18 is a plan view of FIG.

FIG. 19 is a partially cutaway enlarged side view of the main part of FIG.

FIG. 20 is a side view taken along the line HH of FIG.

FIG. 21 is a partially cutaway side view for explaining an up-and-down operation of the unit base chassis in the up-down direction by the up-and-down drive frame.

FIG. 22 is an exploded perspective view for explaining the assembling of the optical pickup unit of the above optical disc drive device.

FIG. 23 is a perspective view for explaining the assembling of the disc tray of the above optical disc drive device.

FIG. 24 is an exploded perspective view for explaining the assembling of the disc clamper support frame of the above optical disc drive device.

FIG. 25 is an exploded perspective view for explaining the assembly of the disk clamper of the above optical disk drive device.

FIG. 26 is an exploded perspective view for explaining the assembly of the upper cover of the optical disk drive device of the above.

FIG. 27 is an exploded perspective view showing a vibration reduction mechanism of a conventional optical disc drive device.

FIG. 28 is a partially cutaway side view for explaining the operation of the conventional vibration reduction mechanism.

[Explanation of symbols]

D is an optical disk which is a disk-shaped recording medium, 1 is an optical disk drive which is a disk drive, 2 is a main chassis which is a second chassis, 31 is a unit base chassis which is a first chassis, 32 is a spindle motor, and 36 Is an optical pickup unit which is a recording / reproducing unit, 47 and 48 are insulators which are first elastic members, 61 is a vibration reduction mechanism, 62 is a balancer which is a weight, 63 is an insulator which is a second elastic member, 70
Is a fulcrum shaft, and 71 is a tension coil spring which is an elastic means.

Claims (5)

[Claims] 1. A spindle motor for rotationally driving a disc-shaped recording medium, a recording / reproducing unit for recording and / or reproducing information on the disc-shaped recording medium, and a first mounting the spindle motor and the recording / reproducing unit. And a second chassis in which the first chassis is mounted via a plurality of first elastic members, and a vibration reduction mechanism mounted in the second chassis. A disk characterized in that the vibration reduction mechanism includes a weight that has a pendulum motion around a rotation center and a second elastic member that holds the weight at a midpoint of a pendulum motion range. Drive device. 2. The disc according to claim 1, wherein a pendulum movement direction of the weight of the vibration reduction mechanism is set to one direction of a tracking direction of the disc-shaped recording medium by the recording / reproducing unit. Drive device. 3. The weight of the vibration reduction mechanism is mounted at a position on the tracking path of the disk-shaped recording medium by the recording / reproducing unit or in the vicinity thereof, at a position opposite to the spindle motor in the first chassis. The disk drive device according to claim 2, wherein 4. A plurality of the weights of the vibration reduction mechanism and a plurality of the second elastic members are mounted on the chassis, and the pendulum movement direction set in one direction of each of the plurality of weights is recorded and reproduced. The disk drive device according to claim 1, wherein the unit is set in both a tracking direction of the disk-shaped recording medium and a direction orthogonal to the tracking direction. 5. The disk drive device according to claim 1, wherein the one weight of the vibration reduction mechanism is configured to be capable of pendulum movement in both a tracking direction and a direction orthogonal thereto.