JP2000195067A - Disc drive and head carrying mechanism therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the size of a disc drive from increasing by passing the turntable side end of a pickup chassis through the inside of a spindle motor. SOLUTION: A head carrying mechanism comprises a spindle chassis 44 and an oscillatory pickup chassis 45 supported on the spindle chassis 44. The pickup chassis 45 is provided, on the turntable 47 side thereof, with a front piece 45a, i.e., an end edge part, entering into the underside of the turntable 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk such as an optical disk or a magneto-optical disk, which is driven to rotate as an information recording medium, and an optical pickup device is moved along the information recording surface of the optical disk to transmit an information signal. The present invention relates to a disk drive device that performs recording (writing) and / or reproduction (reading), and a head feed mechanism suitable for use in the disk drive device.

[0002]

2. Description of the Related Art Conventionally, information is recorded on an optical disk such as a compact disk (CD) or a read-only memory (CD-ROM) or an optical disk such as a magneto-optical disk (OD: optical magnetic disk). 2. Description of the Related Art A disk drive device for recording and / or reproducing information signals as a medium is provided. In this disk drive device, an optical disk is horizontally mounted on a turntable attached to a rotating shaft of a spindle motor, and is driven to rotate. Irradiation. Then, by moving the optical head outward from the center of the optical disk in the radial direction, an information signal is written on the information recording surface or an information signal recorded in advance on the information recording surface is read.

In such a disk drive device, an information recording surface of an optical disk on which an information signal is recorded and an optical head of an optical pickup device provided for reading out the information are moved within a predetermined inclination range. Need to be attached. This is because the inclination of the optical head largely depends on the accuracy of reproducing the information signal. In this case, in order to perform high-density, high-precision recording and / or reproduction of the optical disk, the optical axis of the objective lens of the optical head is perpendicular (90 degrees) to the information recording surface of the optical disk.
°). However, it is difficult to precisely set the optical axis of the objective lens to be perpendicular to the information recording surface of the optical disk because the inclination of the optical disk, the perpendicularity of the spindle motor, the perpendicularity of the objective lens, and the like vary. It is.

Therefore, in a disk drive device using an optical disk such as a CD or a CD-ROM as an information recording medium, the allowable range of the relative tilt angle between the optical disk and the objective lens is within 1.2 ° ( The standard of the tilt angle of the optical disk is 0.6 ° or less, and the standard of the tilt angle of the spindle motor or the objective lens on the optical disk device side is 0.6 °.
°. ). Then, based on the state where the optical disk is mounted at a predetermined position,
By tilting the optical pickup device, the optical axis of the objective lens is adjusted within a predetermined tilt range.

As a disk drive having such a disk tilt mechanism, for example, the one shown in FIG. 14 is known. This disk drive device 1
Is a spindle chassis 2 composed of a plate-shaped frame provided with a substantially rectangular opening inside, and a pickup composed of a plate-shaped frame slightly smaller than the spindle chassis 2 but also provided with an opening. And a chassis 3. The pickup chassis 3 is provided with a pair of shaft portions 3a protruding on both sides in the width direction, while the spindle chassis 2 is provided with a pair of bearing portions 2a that rotatably support the shaft portion 3a. The combination of the pair of bearings 2 a and the shaft 3 a supports the pickup chassis 3 so as to be swingable in the longitudinal direction with respect to the spindle chassis 2.

A tilt drive mechanism 4 is provided on one side of the spindle chassis 2 in the longitudinal direction. The operation of the tilt drive mechanism 4 causes the pickup chassis 3 to swing in the longitudinal direction of the spindle chassis 2. Has become. On the other side of the spindle chassis 2 in the longitudinal direction, a spindle motor 5 is fixed with its rotating shaft facing upward. A turntable 6 on which an optical disk is mounted is integrally attached to a rotating shaft of the spindle motor 5.

A guide shaft 3b and a guide portion (not shown in the figure) are attached to the pickup chassis 3 in parallel with each other at a predetermined interval so as to extend in the longitudinal direction. A slide member 8 of an optical pickup device 7 is slidably supported on the guide shaft 3b and the guide portion, and a rack (not shown) is fixed to the slide member 8, and a head feed mechanism is mounted on the rack. The gear located at the end of 9 is meshed.
By driving the head feed mechanism 9 to transmit the rotational force to the slide member 8, the optical pickup device 7 is moved so as to approach and separate from the turntable 6.

Further, a tilt sensor 10 for detecting a distance from an information recording surface of the optical disk mounted on the turntable 6 is mounted on the slide member 8. The tilt sensor 10 emits light toward the information recording surface and receives light reflected from the information recording surface to detect a warp of the optical disk. This tilt sensor 1
By changing the inclination of the pickup chassis 3 based on the detection result of 0, the inclination of the optical axis of the optical head 7a of the optical pickup device 7 with respect to the inclination of the information recording surface of the optical disk can be adjusted.

[0009]

However, in such a conventional disk drive device, the edge of the pickup chassis 3 on the turntable 6 side is passed outside the spindle motor 5, and the width of the edge is reduced by the edge. There is a problem that the pickup chassis 3 itself becomes large because the frame body is configured by connecting both side edges in the direction. Moreover, the pickup chassis 3
Since the spindle chassis 2 is larger than the spindle chassis 2, there is a problem that the entire disk drive device becomes larger.

The present invention has been made in view of such a conventional problem, and solves the above-mentioned problem by passing an end edge of a pickup chassis on a turntable side inside a spindle motor. It is an object of the present invention to provide a disk drive device capable of performing the above-mentioned operations and a head feed mechanism suitable for use in the disk drive device.

[0011]

Means for Solving the Problems In order to solve the above-mentioned problems and the like, and to achieve the above-mentioned object, a first aspect of the present invention is described.
The head feed mechanism described in (1) includes a spindle chassis rotatably supporting a turntable on which an optical disk for recording and / or reproducing information signals is mounted, and an information signal for an optical disk mounted on the turntable. A pickup chassis that movably supports an optical pickup device for writing and / or reading data to and from a turntable, and that swingably supports the pickup chassis to a spindle chassis. The pick-up chassis is characterized in that an edge portion is provided on a turntable side of the pickup table so as to enter a lower side of the turntable.

A head feed mechanism according to a second aspect of the present invention is characterized in that the edge of the pickup chassis is provided with a slope inclined in a direction in which the edge extends.

According to a third aspect of the present invention, there is provided a disk drive device for transporting an optical disk for recording and / or reproducing an information signal to a disk mounting portion, and transporting the optical disk mounted on the disk tray. A spindle chassis rotatably supporting a turntable on which a mounted optical disc is detachably mounted, and an optical pickup device for writing and / or reading information signals to and from the optical disc mounted on the turntable. A pickup chassis movably supported to move toward and away from the disk drive device, and the pickup chassis is swingably supported on a spindle chassis. Provided edge that goes underneath It is characterized by a door.

According to a fourth aspect of the present invention, the edge portion of the pickup chassis is provided with a slope inclined in a direction in which the edge portion extends.

In the head feed mechanism according to the first aspect of the present invention, the edge of the pickup chassis on the turntable side is inserted under the turntable. The size of the pickup chassis can be reduced, and the size of the spindle chassis can be reduced.

In the head feed mechanism according to a second aspect of the present invention, the pickup chassis is provided with a slope inclined at a direction in which the end extends in the turntable-side end of the pickup chassis. The assembly work of the chassis becomes easy, and the number of parts can be reduced.

In the disk drive device according to the third aspect of the present invention, the end edge of the pickup chassis on the turntable side is inserted under the turntable, so that the pickup chassis itself can be reduced in size and the pickup can be reduced. The size of the spindle chassis can be reduced through the size reduction of the chassis, and as a result, it is possible to contribute to the size reduction of the entire disk drive device.

In the disk drive device according to the fourth aspect of the present invention, the pickup chassis has a slope on the turntable side edge thereof which is inclined in a direction in which the edge extends. The assembly work of the chassis becomes easy, and the number of parts can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a disk drive device and a head feed mechanism thereof to which the present invention is applied will be described with reference to the drawings. The disk drive according to this embodiment is a CD or CD having a diameter of 12 cm and a diameter of 8 cm.
A disk tray system using an optical disk such as a ROM as an information recording medium, carrying the optical disk by a disk tray, automatically loading the information, and reproducing (reading) information recorded on the optical disk; This is applied to a disk drive device.

FIG. 1 is a perspective view showing an embodiment of the disk drive device of the present invention, FIG.
3 is an enlarged perspective view showing the main chassis shown in FIG. 2, FIG. 4 is a perspective view showing a disk tray, FIG. 5 is a perspective view showing a base unit and a base holder,
6 is a perspective view showing a state where the biaxial cover is disassembled from the base unit shown in FIG. 5, FIG. 7 is a front view of the same base unit, FIG. 8 is an exploded perspective view of the same base unit, and FIG. It is a perspective view which shows a chuck plate etc. 10 and 11 are sectional views of the disk drive device of the present invention in the disk tray moving direction. FIG. 10 is a longitudinal sectional view showing an unloading state, and FIG. 11 is a longitudinal sectional view showing a loading state. 12 and 13 show a base unit of the present invention. FIG. 12 is a side view showing a state where the pickup chassis is inclined forward, and FIG. 13 is a side view showing a state where the pickup chassis is inclined backward. .

As shown in FIGS. 1 and 2, the disk drive device 11 comprises a box-shaped main chassis 12 opened on the upper surface and the front surface, a disk tray 13 inserted and removed from the front opening of the main chassis 12, The main chassis 12 includes a base holder 14 housed in a recessed portion and supported swingably, a base unit 15 elastically supported by the base holder 14, and the like.

The main chassis 12 is formed of a rectangular box having a shallow bottom as shown in an enlarged view in FIG. 3, and has a substantially square recess 16 extending to the rear end at the center of the bottom.
Is provided. The bottom surface of the concave portion 16 is formed as a downwardly sloped surface, and at the rear end portion in the front-rear direction X which is the insertion / removal direction of the disc tray 13, both end edges in the left-right direction Y orthogonal to the front-rear direction X and the horizontal direction. Is provided with a pair of bearing portions 17, 17 which are opened upward.
A pair of shaft portions 14a, 14a provided at rear end portions of both sides of the base holder 14 are rotatably supported by the pair of bearing portions 17, 17, respectively. At the front end of the recess 16, a guide ridge 18 and an elongated hole 19 extending in the left-right direction Y and parallel to each other are provided.

Further, a motor seat 12a is formed on one side of the front end of the bottom surface surrounding the recess 16 of the main chassis 12. A loading motor 20 is screwed and attached to the seat 12a on the back side of the main chassis 12. The rotating shaft 20a of the loading motor 20 penetrates through the bottom surface of the main chassis 12 and protrudes into the concave portion 16, and a driving pulley 21 is fixed to the rotating shaft 20a. This drive pulley 21
One end of a rubber belt 22 as a power transmission member is stretched over the other end, and the other end of the rubber belt 22 is hung by a driven pulley 23 disposed substantially at the center of the front end of the bottom surface.

The driven pulley 23 is rotatably supported by a first support shaft 12b erected at the front end of the bottom surface of the main chassis 12, and has a set screw 24 screwed to the first support shaft 12b. Has been prevented by. On the lower surface of the driven pulley 23, a gear that does not appear in the drawing is integrally formed, and the gear is a middle gear 2 of the intermediate gear 25.
5b are engaged. The intermediate gear 25 is rotatably supported by a second support shaft 12c which is also provided upright at the front end of the bottom surface. A drive gear 26 rotatably supported by a third support shaft 12d erected at the bottom front end is meshed with an upper gear 25a provided on the upper surface of the middle gear 25b of the intermediate gear 25.

Further, a lower gear 25c is integrally formed on the lower surface of the middle gear 25b of the intermediate gear 25. As shown in FIG. 10 and the like, a rack 27a of the chuck cam 27 is meshed with the lower gear 25c. The chuck cam 27 is made of a horizontally long rectangular block-shaped member, and a rack 27a protruding to one side is formed on an upper portion thereof. The lower surface of the chuck cam 27 is provided with a guide groove extending in the longitudinal direction. Further, a cam groove 27b for swinging the base holder 14 in the vertical direction is provided on a surface of the chuck cam 27 opposite to the rack 27a.

The cam groove 27b of the chuck cam 27 is
It has upper and lower horizontal portions set at both ends in the longitudinal direction, and a slope portion which obliquely connects the upper and lower horizontal portions. A cam pin 28 provided on the front end face of the base holder 14 so as to protrude forward is slidably engaged with the cam groove 27b. Further, on the upper and lower surfaces of the chuck cam 27,
Operation pins 27c and 27d for manually sliding the chuck cam 27 are provided. The lower operation pin 27d, as shown in FIG. 10 and the like, penetrates the elongated hole 19 of the main chassis 12 and protrudes to the back side.

The upper operation pin 27c of the chuck cam 27
Is provided with a spring receiving piece 27e, and one end of a tension coil spring 29 is locked to the spring receiving piece 27e. The other end of the tension coil spring 29 is locked by a spring receiving piece 12e provided on the seat 12a of the main chassis 12. The chuck cam 27 is constantly pulled toward the seat 12a by the spring force of the tension coil spring 29. Therefore, the chuck cam 27 is connected to the extension coil spring 2.
When the cam pin 28 is located at the end on the side of the seat portion 12a in the pulling direction of No. 9, the cam pin 28 is at the lower horizontal portion of the cam groove 27b, and the base holder 14 is in a forward lowered state.
On the other hand, when the chuck cam 27 is located at the end on the side away from the seat portion 12a against the spring force of the extension coil spring 29, the cam pin 28 is at the upper horizontal portion of the cam groove 27b and the base holder 14 It is in a substantially horizontal state.

The front opening of the main chassis 12 is a tray entrance 30. This tray entrance 30
A plurality of tray guides 31 are provided on each inner surface of the side pieces surrounding both side portions of the base member, and a plurality of guide pins 3 are provided on the bottom piece.
2a and 32b are provided. These tray guides 3
1 and the guide pins 32a, 32b.
Guide rails 13a, 13 provided on both left and right sides of the
The disc tray 13 is held so as to be movable in the front-rear direction X with respect to the main chassis 12 by restricting a and the like, and is configured to be able to be taken in and out of the tray entrance 30.

As shown in FIG. 4 and the like, the disc tray 13 is a CD or a CD-R, which is a specific example of an optical disc.
A disk accommodating portion 34 composed of a circular concave portion capable of accommodating an optical disk 33 such as an OM in a horizontal position, and an opening that extends rearward from the center of the disk accommodating portion 34 along the tray center. Slotted opening 35
Are provided. The disk accommodating portion 34 has a diameter of 12
A large-diameter portion 34a on which an optical disk 33 having a diameter of 8 cm is placed, and a small-diameter portion 34b comprising a concave portion formed at the center of the large-diameter portion 34a and on which the optical disk 33 having a diameter of 8 cm is placed
And

The opening 35 of the disc tray 13
Is opened from the front of the center of the small diameter portion 34b of the disk accommodation portion 34, and extends to the outside of the disk accommodation portion 34 by cutting out a part of the large diameter portion 34a. The size and shape of the opening 35 are such that the upper part of the base unit 15 can completely enter.

On the left and right side edges of the disc tray 13,
A pair of left and right guide rails 13 extending in parallel in the front-rear direction
a, 13a are provided. On one side of the lower surface of the disc tray 13, although not shown, the guide rail 1 is provided.
A rack and a guide groove extending parallel to 3a are provided integrally. A drive gear 26 supported by the main chassis 12 is meshed with the rack, and the disk tray 13 is moved forward or backward by the rotational force of the drive gear 26. The length of the rack is set so that the engagement with the drive gear 26 is released when the disk tray 13 has moved to just before the rear end. A guide pin 32a erected at the front of the main chassis 12 is slidably engaged with the guide groove. The movement of the disc tray 13 is also restricted by the guide pin 32a, and a straight It is configured to move.

The forward / backward movement of the disc tray 13 is detected by a tray feed detection switch 37, and the operation of the tray feed detection switch 37 causes the disc tray 1 to move.
It is possible to detect whether the optical disc 3 moves in the eject direction for ejecting the optical disc 33 or in the setting direction for transporting the optical disc 33 to the disc mounting unit. This tray feed detection switch 37 is fixed to a printed wiring board 38 attached to the lower surface of the main chassis 12. Then, the tray feed detection switch 37
Of the disc tray 13 is projected through a through hole provided in the main chassis 12.

The printed wiring board 38 has connection terminals 39 for supplying power to the loading motor 20 and the like.
And a cam detection switch 40 for detecting the operation of the chuck cam 27 is attached. The actuator 40a of the cam detection switch 40 is arranged on the movement locus of the input section 27f provided on the chuck cam 27. The cam detection switch 40 is turned on when the chuck cam 27 moves a predetermined distance in a direction away from the seat 12a. Reference numeral 41 shown in FIG.
The cover plate is attached to the lower surface of the main chassis 12.

The recess 1 of the main chassis 12 as described above
The base holder 14 housed in the inside 6 has a shape as shown in FIG. That is, the base holder 14 is formed of a box having a substantially rectangular shape with a shallow bottom. Have been. The bottom plate of the base holder 14 is provided with an opening 42a for avoiding contact with a spindle motor or the like and an opening 42b for passing a flexible printed wiring board or the like. In addition, convex portions 14b for positioning and elastically supporting the base unit 15 are provided at three places on the upper surface of the bottom plate. An insulator 43 formed in a gourd shape by a rubber-like elastic material such as rubber or plastic is attached to the convex portion 14b.

The base unit 15 is configured as shown in FIGS. That is, the base unit 15
Is a spindle chassis 44 rotatably supporting a turntable 47 on which an optical disk 33 used for reproducing information signals is mounted, and an optical pickup for reading information signals from the optical disk 33 mounted on the turntable 47 A pickup chassis 45 for movably supporting the device 48 is provided. This spindle chassis 4
4 and pickup chassis 45, base chassis 36
Is configured.

As shown in FIG. 8, the spindle chassis 44 of the base unit 15 is composed of a frame-shaped member having a front piece 44a, left and right side pieces 44b and 44c, and a rear piece 44d. Is set to approximately twice the height of the piece of Supporting portions for supporting the insulator 43 are provided at a total of three places: one corner of the front piece 44a, the front end of the side piece 44b located on the opposite side, and the substantially central part of the rear piece 44d. 49 are provided. The support portion 49 has a flat C-shaped claw shape, and the constricted portion of the insulator 43 is inserted into the support portion 49. Then, a fixing screw (not shown) is inserted into the insulator 43 from above, and the screw portion at the tip is screwed into a screw hole provided on the upper surface of the projection 14b. Thereby, the base unit 15 is elastically supported by the base holder 14 via the three insulators 43.

The front piece 4 of the spindle chassis 44
4a is provided with a motor mounting seat 50 by bulging a part thereof upward. This motor mounting seat 5
A spindle motor 51 is mounted inside 0, and is integrated by being tightened and fixed with a plurality of fixing screws 52a. The rotating shaft 51a of the spindle motor 51
Are protruded above the spindle chassis 44 through the through holes 50 a of the motor mounting seat 50.

The rotating shaft 51a of the spindle motor 51
, An offset washer 53 is fitted and fixed, and a turntable 47 is fitted and fixed above the offset washer 53. A ring fixing portion 47a is formed at the center of the upper surface of the turntable 47 so as to project therefrom, and a chucking ring 54 is fitted and fixed to the ring fixing portion 47a. This chucking ring 54 has a magnet 5 so that it is concentric with the center hole.
4a is buried. The optical disc 33 is positioned on the turntable 47 by fitting the center hole of the optical disc 33 into the chucking ring 54.

Reference numeral 55 shown in FIG. 8 is an offset spring for restricting the movement of the rotating shaft 51a in the axial direction. The offset spring 55 is set so as to cross the motor mounting seat 50, and an intermediate portion thereof has an offset washer 53.
, And both ends thereof are locked to the motor mounting seat 50.

Further, the tilt motor 5 is provided inside the motor mounting seat 50 so as to be aligned with the spindle motor 51.
6 is mounted. The tilt motor 56 is integrated by being fastened and fixed with one fixing screw 52b. The rotation shaft 56a of the tilt motor 56 is
It projects through the 0 hole 50b and above the spindle chassis 44. The rotating shaft 56 of the tilt motor 56
A tilt gear 57 is fitted and fixed to a, and a gear portion 58a of a tilt cam 58 is meshed with the tilt gear 57. The tilt cam 58 is rotatably supported by a support shaft 59 erected on the upper surface of the front piece 44a. A spirally extending cam surface 58 is provided on the upper surface of the tilt cam 58.
The pickup chassis 45 is vertically swung by a stroke in the height direction of the cam surface 58b.

The side piece 4 of the spindle chassis 44
4b, 44c and the rear surface piece 44d are formed so that their cross-sectional shapes are L-shaped over substantially the entire length in the longitudinal direction.
4 to increase the overall rigidity. Further, a pair of bearing portions 60 and 61 are provided in a substantially central portion in the longitudinal direction of the both side pieces 44b and 44c so as to project in the lateral direction.
A pair of rotation shafts 63 provided on the pickup chassis 45 are rotatably held by the bearings 60 and 61.

One of the bearings 60 has a box-shaped box edge 60a which projects greatly outward and is opened on the upper surface.
And a V-shaped receiving surface 60b provided inside the box edge 60a. One of the rotating shaft portions 63 is placed on the receiving surface 60b, and the rotating shaft portion 63 is pressed from above by a pressing piece 62, so that the rotating shaft portion 63 is prevented from coming off. The pressing piece 62 is fastened and fixed to the box edge 60a by a fixing screw 52c. The other bearing portion 61 has a V-shaped receiving surface 61a and a gate-shaped pressing piece 61b surrounding the receiving surface 61a.
With The pressing piece 61b is formed integrally with the side piece 44c. By inserting the other rotating shaft 63 from inside, the rotating shaft 63 is held rotatably with the receiving surface 61a. .

The shape of the pickup chassis 45 as viewed from above is the front piece 44a of the spindle chassis 44.
Are formed in substantially the same size so as to have substantially the same shape as the shape excluding the above. That is, the pickup chassis 45
Is located behind the front piece 44a of the spindle chassis 44 and is adjacent to the front piece 44a.
And a frame-shaped member having a pair of side pieces 45b, 45c facing left and right, and a rear piece 45d continued to the rear. An opening 64 through which the optical head 68 of the optical pickup device 48 penetrates is provided inside these frame members.

Further, the side pieces 45b and 45c of the pickup chassis 45 excluding the front piece 45a and the rear piece 45d.
Is formed so as to have an L-shaped cross section over substantially the entire length in the longitudinal direction, and the rigidity of the entire pickup chassis 45 is increased by adopting such a cross section. The above-described pair of rotating shafts 63 is protrudingly provided at substantially the center in the longitudinal direction of both side pieces 45b and 45c. These side pieces 45b, 45c and rear piece 45d
Is set to be substantially the same as the side piece 44b of the spindle chassis 44 and the like. Therefore, by stacking the pickup chassis 45 at a predetermined position on the spindle chassis 44, the height of the overlapping portion is substantially the same as the height of the front piece 44a of the spindle chassis 44.

On the other hand, the front piece 45a of the pickup chassis 45 is formed in a plate shape so that the left and right side pieces 45b and 45c are connected only by the upper surface. The upper surface of the front piece 45a is provided with a slope 45e having a lower side piece 45b so as to be inclined in the horizontal direction, which is the direction in which the front piece 45a extends. This front piece 45a constitutes an edge of the pickup chassis 45 that enters the lower side of the turntable 47. Thus, the pickup chassis 4
By providing a slope portion 45e on the front piece 45a of No. 5,
Compared with the conventional base chassis, the number of components can be reduced, and assemblability can be improved to facilitate the assembling work.

A positioning projection 45f is provided on the upper surface of the rear piece 45d of the pickup chassis 45. The light-shielding plate 65 is fastened and fixed to the rear piece 45d by the fixing screw 52d by the positioning protrusion 45f. The light-shielding plate 65 has a substantially L-shaped cross section, and covers the upper part of the optical head 68 of the optical pickup device 48 which has moved to the outermost side, particularly, the objective lens 68a.

Further, an insertion hole 66a is provided at the front end of one side piece 45b of the pickup chassis 45, and a bearing 66b is provided at the rear end. A bearing member provided on the feed motor 70 is fitted into the front insertion hole 66a, and the tip end of the feed shaft 69 inserted into the insertion hole 66a is rotatably supported by the bearing 66b. . The feed shaft 69 serves as a rotation shaft of the feed motor 70, and has a spiral screw groove formed on the outer peripheral surface. The feed shaft 69 itself constitutes a rotor of the feed motor 70.
The feed motor 70 includes a bracket 70a which is a fixed side.
Is tightened with two fixing screws 52e so that the side piece 45b projects forward of the pickup chassis 45.
Is fixed to the front edge.

The feed shaft 6 is provided inside the other side piece 45c of the pickup chassis 45 opposite to the feed shaft 69.
A guide shaft 71 is attached so as to be parallel to the guide shaft 9. Therefore, a pair of insertion holes 72 are provided at the front end edge and the rear end edge of the side surface piece 45c, and both ends of the guide shaft 71 are supported by press-fitting both end portions into both the insertion holes 72.

Further, a cam piece 73 projecting toward the tilt cam 58 is provided at the upper front edge of the other side piece 45c of the pickup chassis 45. The free end of a leaf spring 74 is pressed against the cam piece 73, and the leaf spring 7
The cam piece 73 is urged by the spring force of No. 4 and is pressed against the cam surface 58b of the tilt cam 58 located below the cam piece 73.
The fixed end of the leaf spring 74 is fastened and fixed to the upper surface of the front piece 44a of the spindle chassis 44 by a fixing screw 52f.

The optical pickup device 48 movably supported by the feed shaft 69 and the guide shaft 71 can be moved toward and away from the turntable 47 by being guided by both shafts 69 and 71. The optical pickup device 48 has a slide member 75 on which an optical head 68 is mounted. A bearing hole 75a is provided on one side of the slide member 75, and a feed shaft 69 is slidably inserted into the bearing hole 75a. The rack portion 76 a of the sliding rack 76 attached to the lower surface of the slide member 75 is engaged with the thread groove of the feed shaft 69. The rack portion 76a is formed integrally with the fixing piece 76b via an elastic piece. By tightening the fixing piece 76b with the fixing screw 52g, the sliding rack 76
5 is fixed. Further, a bearing portion 75b is provided on the other side of the slide member 75, and the guide shaft 71 is slidably sandwiched between the bearing portions 75b.

The above-described feed shaft 69, feed motor 71 and slide rack 76 constitute a head feed mechanism for moving the optical pickup device 48. The feed shaft 69 and the sliding rack 76 constitute a speed reduction mechanism.

The optical head 6 of the optical pickup device 48
Reference numeral 8 denotes a direction in which the objective lens 68a is focused (vertical direction).
And a two-axis actuator that can be independently moved in the tracking direction (lateral direction). Electromagnetic force is exclusively used as the driving force of the two-axis actuator. In this embodiment, a leaf spring-type two-axis actuator classified as a difference in the method of supporting the movable portion is employed. However, it is a matter of course that other types of wire support system, hinge system, and shaft sliding system can be applied as the biaxial actuator. Reference numeral 77 shown in FIG. 8 is a biaxial cover that covers the biaxial actuator.
7, an opening window 77 for exposing the objective lens 68a is provided.
a is provided.

As shown in FIG. 2, a chuck holder 80 is mounted on the upper portion of the main chassis 12 so as to cross over the disk tray 13. As shown in an enlarged view in FIG. 9, the chuck holder 80 is formed of a thin, horizontally long rectangular plate, and a through hole 80a is provided at a substantially central portion in the longitudinal direction. In the through hole 80a, three leg pieces 82 of the chuck plate 81 are provided.
Is loosely inserted. These three leg pieces 82 are arranged on an arc so that the outer peripheral surface forms a part of the circumference, and the inside of these leg pieces 82 is attracted by a magnet 54 a built in the chucking ring 54. A disk-shaped yoke plate 83 made of an iron plate or the like is stored.

A yoke pressing plate 84 is attached to the tip of each leg 82 which protrudes upward through the through hole 80a of the chuck holder 80. By holding a predetermined gap between the yoke pressing plate 84 and the chuck plate 81 and sandwiching the chuck holder 80, the chuck plate 81 can be moved in a direction orthogonal to the plane direction within the range of the gap. And the through holes 80a and 3
By setting a gap between each of the leg pieces 82, the chuck plate 81 is configured to be movable in the plane direction within the range of the gap.

The material of the main chassis 12, the disc tray 13 and the base holder 14 is AB
S resin is suitable, but other synthetic resins can be used, and metals such as aluminum alloys can also be used. The spindle chassis 44 and the pickup chassis 45 constituting the base chassis 36 are preferably made of PPS (polyphenylene sulfide) containing 65% of glass fiber, but it is needless to say that other synthetic resins can be applied. A metal such as an aluminum alloy can also be used.

According to the disk drive device 11 having such a configuration, for example, the reproduction operation of the optical disk 33 can be performed as follows. First, after turning on the power to the disk drive device 11, for example, by pushing the eject button to pull out the disk tray 13 and put it in the eject state, the disk storage portion 34 is exposed, and the large-diameter portion 34a or the small-diameter portion 34b The optical disk 33 can be mounted on the optical disk.

After the desired optical disk 33 is placed in the disk storage section 34, the loading mechanism is operated by, for example, pressing a play button, so that the disk tray 13
Is transported to the disc mounting unit. A diagram showing this state,
It is FIG. Note that the chuck holder 80 shown in FIGS. 10 and 11 is slightly modified from the chuck holder 80 shown in FIG. 9 so as to be able to simultaneously close the entire disk storage portion 34 and the opening 35.

When the loading motor 20 is driven by the operation of the reproduction button or the like during the transfer of the disc tray 13, the rotational force is transmitted from the driving pulley 21 to the driven pulley 23 via the rubber belt 22. This driven pulley 2
The rotation force of No. 3 is transmitted from the middle gear 25b of the intermediate gear 25 to the drive gear 26 via the upper gear 25a. The rotational force of the drive gear 26 is transmitted to the rack of the disk tray 13, whereby the disk tray 13 is moved to the rear of the main chassis 12 by being guided by the tray guide 31 and the guide pins 32 a and 32 b. At this time, while the disc tray 13 moves to the rearmost end, the intermediate gear 25
Since the lower gear 25c is not meshed with the rack 27a of the chuck cam 27, the chuck cam 27 does not move.

Thereafter, when the disc tray 13 moves to the rearmost end, the upper operation pin 27c of the chuck cam 27 enters into a cam groove provided on the lower surface of the disc tray 13, and the chuck cam 27 is slightly guided by the cam groove. Moving. As a result, the rack 27a of the chuck cam 27
Are meshed with the lower gear 25c, and the loading motor 20
Transmission of torque from the motor. On the other hand, when the disk tray 13 reaches the rearmost end, the mesh between the rack of the disk tray 13 and the drive gear 26 is released, and the transmission of torque from the loading motor 20 becomes impossible.

Next, when the rotational force of the loading motor 20 is transmitted from the lower gear 25c to the rack 27a, the chuck cam 27 moves away from the loading motor 20 against the spring force of the extension coil spring 29. By the movement of the chuck cam 27, the cam pin 28 of the base holder 14 engaged with the cam groove 27b is
7b moves from the lower horizontal portion to the upper horizontal portion via the slope portion.
As a result, the base holder 14 is swung upward through the shaft portion 14a at the rear end, and becomes substantially horizontal. FIG. 11 shows this state.

At this time, when the front portion of the base holder 14 is lifted, the turntable 47 supported on the swinging side of the base unit 15 elastically supported by the base holder 14 via the insulator 43 becomes a disc. It enters the opening 35 of the tray 13. This allows
The chucking ring 54 attached to the turntable 47 enters the center hole 33a of the optical disc 33,
The optical disk 33 is placed on the turntable 47.
At this time, the optical disk 33 is slightly lifted by the turntable 47 and the chuck plate 81 held by the chuck holder 80 is moved to the turntable 4.
7 is attracted to a magnet 47a built in the apparatus.

As a result, the optical disk 33 is held between the turntable 47 and the chuck plate 81. Thus, the optical disk 33 is integrated with the turntable 47 in the rotation direction, and is driven to rotate at a predetermined rotation by the rotation force of the spindle motor 51.

At the same time or before and after this, the feed motor 70
Is driven. As a result, the rotation of the feed shaft 69 causes the slide member 75 of the optical pickup device 48 to move closer to the turntable 47 in accordance with the rotation direction. This optical pickup device 48 is used for the turntable 4
7, the inclination of the optical disc 33 mounted on the turntable 47 can be detected. The detection of the amount of tilt of the optical disk 33 is performed, for example, as follows.

That is, when the optical pickup device 48 moves from the outside to the inside in the radial direction of the optical disk 33, a laser beam is emitted from the objective lens 68a of the optical head 68 toward the information recording surface of the optical disk 33, and the laser beam is emitted. Is continuously detected until it returns. By comparing the detected times, the optical disk 33
Can be detected.

Next, an operation for correcting the tilt amount of the optical disk 33 detected in this manner will be described. Now, it is assumed that the spindle chassis 44 and the pickup chassis 45 constituting the base chassis 36 are inclined toward the turntable 47 as shown in FIG. When the tilt of the optical disk 33 is detected in this state, the tilt motor 56 is driven, and its rotational force is transmitted from the rotating shaft 56a to the tilt gear 57. By the rotation of the tilt gear 57, a rotational force is transmitted from the gear portion 58 a meshing with the tilt gear 57 to the tilt cam 58, and the tilt cam 58 is rotated according to the rotation amount of the tilt motor 56.
Is driven to rotate.

The cam surface 58b of the tilt cam 58 has
The pickup chassis 45 is driven by the spring force of the leaf spring 74.
Is always biased. As a result, since the cam piece 73 moves along the cam surface 58b, the pickup chassis 45 is turned around the pair of left and right turning shafts 63 located at the substantially central portion as the turning centers.
Change posture in a counterclockwise direction. When the highest position of the cam surface 58b comes into contact with the cam piece 73 due to the rotation of the tilt cam 58, the pickup chassis 45
As shown in FIG. 3, the state is inclined backward.

When the tilt amount of the optical disk 33 is adjusted by the adjustment of the tilt mechanism, the optical pickup device 48 reproduces the information signal recorded on the information recording surface of the optical disk 33. The reproduction of the information signal by the optical pickup device 48 is performed, for example, as follows. That is, laser light is emitted from the objective lens 68a of the optical head 68 toward the information recording surface, and the reflected light of the laser light is received through the objective lens 68a, so that the information signal recorded on the information recording surface is obtained. Is played.

When the disc tray 13 is ejected, an operation reverse to the above-described operation at the time of loading is performed. For example, when the eject button is pressed to select the eject operation, the loading motor 20 is driven to rotate in the reverse direction, and the rotational force is applied to the driving pulley 21 and the rubber belt 2.
2. Lower gear 25c of driven pulley 23 and intermediate gear 25
To the rack 27a. As a result, the chuck cam 27 moves in a direction approaching the loading motor 20, and the cam pin 28 is pushed down. as a result,
The base holder 14 is moved from the horizontal state shown in FIG.
The state changes to the forward leaning state shown in FIG.

As a result, the base unit 15 supported by the base holder 14 swings downward, and the turntable 47 on which the optical disk 33 is placed is moved downward. By this lowering operation of the turntable 47, the chuck plate 81 is peeled off. Subsequently, the chucking ring 54 of the turntable 47 is
The optical disk 33 comes out of the center hole 33a of the disk tray 3 and is placed on the disk storage section 34 of the disk tray 13. In such a state, the disk tray 13 can be pulled out.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, an example in which a read-only optical disk such as a CD or a CD-ROM is used as an information recording medium will be described. However, a recordable optical disk or a magneto-optical disk on which information can be newly written can be applied as the information recording medium. Further, in the above embodiment, an example in which an optical disk such as a CD is used in a bare state has been described. However, an information recording medium in which the optical disk is housed in a disk cartridge may be used.

In the above embodiment, the disk drive of the disk tray system for reproducing (reading) the information recorded on the optical disk and the head feed mechanism thereof have been described. The present invention can be applied not only to a disk drive device but also to a disk drive device capable of performing both recording and reproduction of information and a head feed mechanism thereof. As described above, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist thereof.

[0072]

As described above, according to the first aspect of the present invention,
According to the head feed mechanism described in (1), since the edge of the pickup chassis on the turntable side enters the lower side of the turntable, it is not necessary to pass the edge to the outside of the turntable. Can be easily assembled. In addition, since the edge of the pickup chassis does not protrude outside the turntable, the external dimensions of the pickup chassis can be reduced, and the overall size of the base chassis can be reduced through the miniaturization of the pickup chassis. The effect that can be obtained can be obtained.

According to the head feed mechanism according to the second aspect of the present invention, since the slope portion is provided at the edge of the pickup chassis on the turntable side, the edge can be easily provided below the turntable. The pickup chassis can thus be easily assembled. In addition, if the edge of the pickup chassis is not inclined, a component for supporting the shaft is required because the pickup chassis cannot be assembled, but the present invention does not require such a component. The points can be reduced.

According to the disk drive device of the third aspect of the present invention, since the edge portion of the pickup chassis on the turntable side enters the lower side of the turntable, the edge portion is located outside the turntable. Therefore, the pickup chassis can be easily assembled. Moreover, since the edge of the pickup chassis does not protrude outside the turntable, the external dimensions of the pickup chassis can be reduced, and the overall size of the disk drive device can be reduced through the miniaturization of the pickup chassis. Can be obtained.

According to the disk drive device of the fourth aspect of the present invention, since the slope portion is provided at the edge of the pickup chassis on the turntable side, the edge can be easily provided under the turntable. The pickup chassis can thus be easily assembled. In addition, if the edge of the pickup chassis is not inclined, a component for supporting the shaft is required because the pickup chassis cannot be assembled, but the present invention does not require such a component. The score can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing one embodiment of a disk drive device of the present invention.

FIG. 2 is an exploded perspective view of the disk drive device of the present invention shown in FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2 and is a perspective view of a main chassis and other parts according to the disk drive device of the present invention.

FIG. 4 is a perspective view showing a disk tray according to the disk drive device of the present invention.

FIG. 5 is an enlarged view of a main part of FIG. 2, and is a perspective view showing a base chassis and a base holder according to the disk drive device of the present invention.

FIG. 6 is a perspective view showing a base unit according to the disk drive device of the present invention, in a state where a biaxial cover is disassembled.

FIG. 7 is a front view showing a base unit according to the disk drive device of the present invention, in a state where a turntable is sectioned;

FIG. 8 is an exploded perspective view of a base unit according to the disk drive of the present invention.

FIG. 9 is an enlarged view of a main part of FIG. 2, and is a perspective view showing a chuck plate and the like according to the disk drive device of the present invention.

FIG. 10 is a cross-sectional view of the disk drive device of the present invention in a tray conveying direction, and is a cross-sectional view in an unloading state in which a turntable is lowered.

FIG. 11 is a cross-sectional view of the disk drive device of the present invention in a cross section in a tray conveying direction, in a loading state in which a turntable is lifted.

FIG. 12 is a side view showing a base chassis according to the disk drive device of the present invention, in which a pickup chassis is tilted forward.

FIG. 13 is a side view showing the base chassis according to the disk drive device of the present invention, in which the pickup chassis is tilted rearward.

FIG. 14 is a perspective view showing a conventional disk drive device.

[Explanation of symbols]

11 disk drive unit, 12 main chassis, 13 disk tray, 14 base holder,
15 base unit, 20 loading motor, 27 chuck cam, 33 optical disk (optical disk), 35 opening, 36 base chassis,
44 spindle chassis, 45 pickup chassis, 47 turntable, 48 optical pickup device, 51 spindle motor, 56 tilt motor, 58 tilt cam, 68 optical head,
69 feed shaft, 70 feed motor, 73 cam piece,
76 Sliding rack

Claims (4)

[Claims] 1. A spindle chassis rotatably supporting a turntable on which an optical disk for recording and / or reproducing information signals is mounted, and an information signal for the optical disk mounted on the turntable. A pickup chassis that movably supports an optical pickup device that performs writing and / or reading so as to approach and separate from the turntable; and a head feed mechanism that swingably supports the pickup chassis on the spindle chassis. 3. The head feed mechanism according to claim 1, wherein an edge portion that enters a lower side of the turntable is provided on the turntable side of the pickup chassis. 2. The head feed mechanism according to claim 1, wherein the edge portion of the pickup chassis is provided with a slope portion inclined in a direction in which the edge portion extends. 3. A disk tray for transporting an optical disk for recording and / or reproducing information signals to a disk mounting portion, and the optical disk mounted and transported on the disk tray is detachably mounted. A spindle chassis that rotatably supports a turntable, and an optical pickup device that writes and / or reads information signals to and from the optical disk mounted on the turntable, are moved toward and away from the turntable. A pickup chassis movably supported, wherein the pickup chassis is swingably supported by the spindle chassis. The turntable side of the pickup chassis has an end that enters a lower side of the turntable. Characterized by having an edge Disk drives equipment. 4. The disk drive according to claim 3, wherein the edge of the pickup chassis is provided with a slope inclined in a direction in which the edge extends.