JPH11149724A - Optical disc apparatus and optical disc apparatus assembling method - Google Patents

Abstract

(57) [Problem] To provide an optical disk device having a thin configuration and an optical disk device assembling method with improved assemblability and reduced residual tilt after tangential tilt adjustment. SOLUTION: The urging members of guide shaft support means 21 and 31 are conical coil springs 22 and 32 so as to be thin. Guide shaft 2 for supporting / transporting system of optical pickup 1
As a three-axis configuration including the screw shafts 0, 30, and the screw shaft 4, the driving means 6 and the driving force transmitting means 8 of the screw shaft 4 have an optimal layout, and the thickness is further reduced.
By optimizing the position in the disk radial direction in the tangential tilt adjustment step, the difference between the inner and outer circumferences of the tangential component of the tilt error between the recording surface 10a and the optical axis 1a was minimized, and the jitter margin was increased. Guide shafts 20, 30
The optical pickup 1 was fitted with the end of the optical pickup 1 protruding upward to improve the assemblability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus and an optical disk apparatus for recording or reproducing a high-density and high-capacity disk-shaped recording medium such as a DVD, and used as a peripheral device for home video equipment and computers. And an assembling method.

[0002]

2. Description of the Related Art At present, as a common format for recording media in the field of home audiovisual and computer communications, CDs are used.
DVDs with eight times the storage capacity of DVDs are in the limelight.
D-players and DVD-ROMs are already on the market.

Generally, when the recording surface of a disc is inclined with respect to the optical axis of an objective lens, the NA value (numerical aperture) of the optical system is increased.
The wavefront aberration occurs in proportion to the cube of. However, DV
In D, in order to perform high-density recording and reproduction, the NA value of the optical system of the optical pickup is set to (0.6) larger than CD (0.45). Greatly deteriorates. Therefore, in a DVD optical disk device, a tilt angle (the tilt angle between the optical axis of the optical pickup and the disk recording surface) is used to improve jitter.
Requires a mechanism to adjust.

A conventional example of an optical disk apparatus having such a function is disclosed in Japanese Patent Application No. 8-26956 filed earlier.
This is shown in No. 2. In this specification, the outer peripheral ends of the main shaft and the sub shaft that support the movement of the optical pickup in the disk radial direction can be adjusted in the direction facing the disk, and the optical pickup is held at the intermediate radial position, An optical disk device is shown which adjusts a radial tilt by swinging a main shaft and adjusts a tangential tilt by swinging a sub shaft.

[0005]

However, in the above configuration, since the cylindrical coil springs are used below the outer peripheral ends of the main shaft and the counter shaft, the spring wire diameter × the number of windings even in the maximum compression state. However, there is a problem that it is difficult to reduce the thickness of the device.

When tilt adjustment is performed while holding the optical pickup at an intermediate radius position, if a tilt adjustment error occurs, the residual error of tangential tilt when the optical pickup is at the outer peripheral position increases. It also had problems.

The present invention solves the above problems and provides a thin and small optical disk device that can be mounted on a notebook personal computer. In addition, the present invention aims to improve the performance by reducing the tilt adjustment error of the optical pickup and to improve the assemblability. An object of the present invention is to provide a method of assembling an optical disk device that can be improved.

[0008]

In order to achieve the above object, an optical disk apparatus according to the present invention is arranged such that an end of a moving guide shaft of an optical pickup on an outer peripheral side of the disk is opposed to the disk by a conical coil spring and an adjusting screw. The coil spring has a spiral shape when viewed from the axial direction, so that the wires can be deformed into a flat shape at maximum compression without interfering with each other.

With this configuration, a thin and small optical disk device can be provided. The method for assembling an optical disk device according to the present invention is configured such that only the inner end of the guide shaft on the disk is attached to the guide shaft support means, and the optical pickup is mounted with the outer end of the disk raised upward. I have.

With this configuration, the tilt adjustment error of the optical pickup can be reduced, the performance can be improved, and the assemblability can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a guide shaft for supporting an optical pickup and guiding the movement in the disk radial direction, and connecting the end of the guide shaft on the disk outer peripheral side to the disk. Guide shaft variable means for supporting in an opposing direction so as to be adjustable, the guide shaft variable means having a configuration in which a conical guide shaft coil spring and a guide shaft adjusting screw are arranged to face each other with the guide shaft interposed therebetween. Wherein the conical guide shaft coil spring has a spiral shape when viewed from the axial direction, and at the time of maximum compression, the wires can be deformed into a flat shape without interfering with each other. The guide shaft coil spring, which is an urging member of the guide shaft variable means, is a conical coil spring, and can be deformed into a flat shape without maximum interference at the time of maximum compression. , By reducing the coil spring height at maximum compression, and thin devices height.

According to a second aspect of the present invention, there is provided the optical disk apparatus according to the first aspect, wherein the guide shaft adjusting screw is disposed outside the outer periphery of the disk. May be the smallest square shape.

According to a third aspect of the present invention, there is provided the optical disk device according to the first or second aspect, wherein the nut member provided on the optical pickup and the nut member provided substantially parallel to the guide shaft are engaged with the nut member. A screw shaft for transferring the optical pickup from the inner circumference to the outer circumference of the disk, a driving unit for rotating the screw shaft, a driving force transmitting unit for transmitting a driving force of the driving unit to the screw shaft, the guide shaft, A base chassis that supports the guide shaft variable unit, the screw shaft and the driving unit together with the optical pickup and the disk motor, a relay board that connects a wiring member from the optical pickup and a wiring member from the disk motor, and a tray loading operation Tray eject means that enables Means, a tray for supporting the base chassis and the relay board in an overall width smaller than a disk diameter, a main board for connecting a wiring member from the relay board, and a tray operable for supporting the main board and loading the tray. The main body is located at the back, the tray is located at the front, and the tray is arranged at an angle with the base chassis, whereby each of the trays is left on both sides. The relay board is arranged in a space facing the main board in the back of the triangular space, and the tray ejecting means is arranged in a space in the foreground. By using a plurality of shafts composed of a shaft and a screw shaft, the screw shaft and the driving means can be arranged freely. The layout is optimal for thinning, including the driving force transmission means, and the base chassis is provided diagonally with respect to the tray, and the relay board and the tray eject means are provided in the triangular spaces remaining on both sides. By arranging each part efficiently inside the thinned device, the space can be effectively used, the floor area can be reduced, and the guide shaft adjusting screw is disposed outside the disk outer periphery and the guide shaft is arranged. Are obliquely arranged, the outer package has the smallest square shape including the disk diameter.

According to a fourth aspect of the present invention, there is provided a guide shaft for supporting an optical pickup and guiding movement in a disk radial direction, and a guide shaft supporting means for supporting an end of the guide shaft on the inner peripheral side of the disk. The guide shaft supporting means has an opening into which the guide shaft is inserted, the opening being larger than the guide shaft when viewed from obliquely above, and smaller than the guide shaft when viewed from the horizontal direction. When one end of the guide shaft is inserted obliquely upward from above, the other end of the guide shaft floats upward and stops, and the other end of the guide shaft floats upward. By attaching the optical pickup to the guide shaft in the state in which the optical pickup is set, the assemblability is improved.

According to a fifth aspect of the present invention, there is provided the optical disk apparatus according to the fourth aspect, wherein two guide shafts respectively supporting both ends of the optical pickup have one ends attached to guide shaft support means. In this state, the other end is lifted upward in a state substantially parallel to each other, and the support / transport system of the optical pickup has a three-axis configuration including a main shaft, a sub-shaft, and a screw shaft. The thickness can be further reduced by optimizing the layout of the shaft driving means and the driving force transmitting means.

According to a sixth aspect of the present invention, in the optical disk apparatus according to the first or fourth aspect, after the guide shaft is attached to the guide shaft support means, the floating outer end of the guide shaft is removed. It is characterized in that the reaction force when pressed down horizontally to attach to the guide shaft variable means acts in the same direction as the biasing direction of the conical guide shaft coil spring.

According to a seventh aspect of the present invention, a guide shaft for supporting the optical pickup and guiding the movement in the radial direction of the disk, and the end of the guide shaft on the outer peripheral side of the disk can be adjusted in a direction facing the disk. A guide shaft variable means for supporting the optical disc, and mounting only the end of the guide shaft on the inner circumference side of the disc to the guide shaft support means, and mounting the optical pickup with the end on the outer circumference side of the disc floating above. A method of assembling an optical disc device, wherein an optical pickup is fitted with an end of a guide shaft protruding upward, thereby facilitating mounting of the optical pickup,
The assemblability will be improved.

According to the present invention, there is provided a spindle for supporting an optical pickup and guiding movement in a radial direction of a disc;
A sub-shaft provided substantially parallel to the main shaft and supporting one point on the opposite side of the main shaft of the optical pickup; and a sub-shaft variable supporting an end of the sub-shaft on the outer peripheral side of the disc so as to be adjustable in a direction facing the disc. An optical pickup device, comprising: an optical disk drive; and a sub-shaft supporting means for supporting an end of the sub-shaft on the inner peripheral side of the disk and serving as a fulcrum for swinging of the sub-shaft by the sub-shaft variable means. A tangential tilt adjustment step of adjusting the sub-axis variable means so as to minimize a tilt error between the optical axis of the disk and the recording surface of the disk in the tangential direction of the disk, and the optical pickup in the tangential tilt adjustment step The radial position of the disk, the predicted maximum tilt angle with respect to the disk recording surface of a straight line connecting the main axis in the main shaft support means and the sub-axis in the sub-shaft support means Θs, ± 予 測 p the predicted maximum inclination angle from 90 degrees with respect to the optical axis of a straight line connecting the contact point with the main axis and the contact point with the sub-axis in the optical pickup; The distance from the sub-bearing portion of the optical pickup at the outermost peripheral position of the optical pickup to the sub-shaft supporting device is L2, and the distance from the sub-bearing portion of the optical pickup at the time of adjusting the tangential tilt is L1. Assuming that the distance to the countershaft support means is X and the maximum predicted error angle in the tangential tilt adjustment step is ± Θd, X = (１ ／) ｛[tan (Θd) / tan (Θs + Θ)
p)] · (L2−L1) + (L2 + L1)｝, which is an assembly method of an optical disk device, wherein the position of the optical pickup in the disk radial direction in the tangential tilt adjustment step is optimized. The jitter margin is increased by minimizing the difference between the inner and outer circumferences of the tangential component of the tilt error between the recording surface of the disc and the optical axis of the optical pickup, thereby improving the performance.

According to a ninth aspect of the present invention, there is provided the method of assembling the optical disk device according to the eighth aspect, further comprising: a spindle variable means for supporting an end of the spindle on the outer peripheral side of the disk so as to be adjustable in a direction facing the disk. A main shaft supporting means for supporting an end of the main shaft on the inner peripheral side of the disk and serving as a fulcrum for swinging of the main shaft by the main shaft variable means, in a disk radial direction between an optical axis of the optical pickup and a recording surface of the disk. A radial tilt adjustment step of adjusting the spindle variable means so as to minimize the tilt error of the optical pickup. The optical pickup is swung together with the guide axis so that the optical axis of the optical pickup is perpendicular to the disk recording surface. The angle can be adjusted to reduce the reproduction jitter margin, make the device smaller and thinner, and minimize the tilt error (tangential tilt). The assembly method with optimized setting position of the optical pickup in step.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the base chassis of the optical disk device will be described with reference to FIGS. FIG.
FIG. 2 is a partially transparent perspective view showing a configuration of a base chassis section including an optical pickup transfer system and a disk motor in the optical disk device of the present invention.

In FIG. 1, reference numeral 10 denotes a disk, 1 denotes an optical pickup, and 2 denotes a disk motor on which a disk holding means (mechanism) 2a is mounted. Reference numeral 3 denotes a base chassis to which a stator portion of the disk motor 2 is fixed, and a wiring member (FPC) 2c of the disk motor 2 is attached to a front surface, and a wiring member (FPC) 1e of the optical pickup 1 is attached to a back surface.

Reference numeral 20 denotes a main shaft (guide shaft) that supports the optical pickup 1 via bearings 1b and 1c, and guides the movement of the optical axis 1a of the optical pickup 1 in the radial direction from the inner circumference to the outer circumference of the disk 10. I do. Reference numeral 30 denotes a sub shaft (guide shaft) provided substantially in parallel with the main shaft 20, and supports the optical pickup 1 with a U-shaped sub bearing portion 1d. The sub bearing 1d of the optical pickup 1 has an arrow 1A as shown in FIG.
When viewed from the direction, it is curved in both directions, and is in point contact with the counter shaft 30 on the curved receiving surface 1f.

Reference numeral 4 denotes a screw shaft which is provided in parallel with the main shaft 20 and has a groove in a spiral shape. Reference numeral 5 denotes a nut member which is attached to the optical pickup 1 and whose teeth mesh with the screw shaft 4.

Reference numeral 21 denotes a main shaft supporting means (guide shaft supporting means) for supporting the inner peripheral end of the main shaft 20, which is made of an elastically deformable material such as a resin. In this embodiment, the screw shaft 4 is rotatable. Also serves as a supporting bearing. Reference numeral 14 denotes a thrust spring attached to the main shaft support means 21, which presses an elastic portion against the tip of the screw shaft 4 in order to remove play in the axial direction of the screw shaft 4.

When the support portion of the main shaft 20 in the main shaft support means 21 is represented by a cross-sectional view as viewed from the direction of arrow 21A, as shown in FIG. 3, the main shaft support means 21 has a larger diameter than the diameter 20d of the inner peripheral end (one end) 20a. Upper support 21a and lower support 21b
Since the gap 21d is smaller, when only the inner peripheral end 20a of the main shaft is attached, the outer peripheral end (the other end) 20b of the main shaft 20 floats up as shown by the imaginary line in FIG. When the outer peripheral end 20b is mounted horizontally, the main shaft 20 receives a reaction force due to elastic deformation from the upper support portion 21a and the lower support portion 21b, and a moment in the direction of the arrow 20M is generated on the main shaft 20. I do.

Reference numeral 22 denotes a conical, compression coil spring type main shaft coil spring (guide shaft coil spring), which is disposed between the base chassis 3 and the main shaft outer peripheral end 20b as shown in FIG. Energize. The main shaft coil spring 22 has a spiral shape when viewed from above, and at the time of maximum compression, as shown in FIG. 5, the wires can be deformed into a flat shape with a height of about 1 mm without mutual interference. Note that the conventional coil spring is a cylindrical compression coil spring, so that the maximum diameter is about 3 times the diameter of the wire rod even at the maximum compression.
mm. In addition, a moment 20M generated on the main shaft 20 by the reaction force of the main shaft support means 21
Acts in the direction of arrow 20A on the outer peripheral end 20b of the main shaft, which is the same direction as the biasing direction of the main shaft coil spring 22.

Reference numeral 23 denotes a spindle bracket for supporting the spindle outer peripheral end 20b, which freely supports the movement of the spindle 20 in the direction facing the disk 10 (arrow 20A or arrow 20B), and holds the spindle coil spring 22 therein. And is fixed to the base chassis 3. A spindle cover 24 made of sheet metal is fixed on the spindle bracket 23 to cover the spindle outer peripheral end 20b and the spindle coil spring 22. Reference numeral 25 denotes a main shaft adjusting screw (guide shaft adjusting screw) arranged to face the main shaft coil spring 22 with the main shaft 20 interposed therebetween. By rotating the main shaft adjusting screw, the main shaft 20 faces the disk 10 (in the direction of the arrow 20A or the arrow 20B). ) Can be adjusted.

Therefore, the main shaft coil spring 22, the main shaft bracket 23, the main shaft cover 24, and the main shaft adjusting screw 25 constitute a main shaft variable means (guide shaft variable means) 26. Reference numeral 31 denotes a sub-shaft supporting means (guide shaft supporting means) for supporting the inner peripheral end of the sub-shaft 30, and is made of an elastically deformable material such as resin. As shown in FIG. 6, the auxiliary shaft support means 31 is provided with a support portion 31a above the auxiliary shaft support means 31 and a lower support than the diameter 30d of the inner peripheral end (one end) 30a of the auxiliary shaft as shown in FIG. Since only the gap 31d of the portion 31b is smaller, when only the inner peripheral end 30a of the sub shaft is attached, the outer peripheral end (the other end) 30b of the sub shaft 30 is lifted up as shown by a virtual line in FIG. Furthermore, when the sub shaft outer peripheral end 30b is horizontally mounted, the sub shaft 30 receives a reaction force due to elastic deformation from the upper support portion 31a and the lower support portion 31b. A moment in the direction of arrow 30M is generated.

Numeral 32 denotes a conical, coil spring type guide shaft coil spring (guide shaft coil spring) which is disposed between the base chassis 3 and the counter shaft outer peripheral end 30b as shown in FIG. It is urged in the direction of arrow 30A. The counter shaft coil spring 32 has a spiral shape when viewed from above, and can be deformed to a flat shape having a height of about 1 mm without the wires interfering with each other at the time of maximum compression as in FIG. A moment 30M generated on the countershaft 30 by the reaction force of the countershaft support means 31 acts in the direction of arrow 30A at the countershaft outer peripheral end 30b, which is the same direction as the biasing direction of the countershaft coil spring 32.

Reference numeral 33 denotes a countershaft bracket for supporting the countershaft outer peripheral end 30b, which freely supports the movement of the countershaft 30 in the direction (arrow 30A or 30B) facing the disk 10, and has the countershaft inside. The coil spring 32 is held and fixed to the base chassis 3. Reference numeral 34 denotes a countershaft cover made of sheet metal, which covers the countershaft outer peripheral end 30b and the countershaft coil spring 32 by being fixed on the countershaft bracket 33. Reference numeral 35 denotes a sub-shaft adjusting screw (guide shaft adjusting screw) which is arranged to face the sub-shaft coil spring 32 and the sub-shaft 30, and rotates the sub-shaft 30 so that the sub-shaft 30 faces the disk 10 (arrow 30 </ b> A). Or arrow 30B
Direction).

Accordingly, the sub shaft coil spring 32, the sub shaft bracket 33, the sub shaft cover 34, and the sub shaft adjusting screw 35 constitute a sub shaft variable means (guide shaft variable means). In FIG. 1, reference numeral 6 denotes a driving unit such as a motor for driving the screw shaft 4 to rotate, and 7 denotes a motor bracket for fixing the driving unit 6 to the base chassis 3. Reference numeral 81 denotes a motor gear fixed to the output shaft of the driving means 6, reference numeral 82 denotes a screw gear fixed to the screw shaft 4, reference numeral 83 denotes an intermediate gear rotatably provided on the main shaft support means 21, and these motor gear 81 and screw gear The driving force transmitting means 8 is composed of the intermediate gear 83 and the intermediate gear 83.

Reference numeral 9 denotes a base cover made of a thin sheet metal and covers the entire base chassis 3 except for the vicinity of the optical axis 1a of the optical pickup 1 and the disk motor 2. 11, 12,
Reference numeral 13 denotes a damper that is attached to the base chassis 3 and buffers an external impact.

Here, when the arrangement of the screw shaft 4, the driving means 6 and the driving force transmitting means 8 is viewed from the direction of arrow 8A, as shown in FIG. 8, the height from the upper surface of the base cover 9 to the lower surface of the base chassis 3 is increased. Center of H (H / 2)
The center of the screw shaft 4 and the center of the driving means 6 are arranged so as to be roughly positioned, and the diameter of the screw gear 82 is made large so that the reduction ratio in the driving force transmission means 8 can be made large. The driving means 6 can be used.

Next, the overall configuration of the optical disk device according to the embodiment of the present invention will be described with reference to FIGS. 9 is a partially transparent perspective view showing the general outline of the optical disk device of the present invention, FIG. 10 is a schematic partial cross-sectional view of the optical disk device of FIG. 9 viewed from the front, and FIG. 11 is a general outline of the optical disk device of FIG. It is a transparent top view shown.

In FIGS. 9 and 10, reference numeral 50 denotes an exterior body made of sheet metal, and a second rectangular parallelepiped 50 having a smaller width is provided below a first rectangular parallelepiped 50a containing the disk 10.
b are stacked with their left side surfaces aligned. 51, 52
Are U-shaped rail guides respectively fixed to the left and right ends in the second rectangular parallelepiped 50b of the exterior body 50, and 53 and 54 are guided by the U-shaped inner surfaces of the rail guides 51 and 52, and arrow 4
The rail is provided so as to be movable in the 0A or 40B direction.

Reference numeral 40 denotes a tray which is guided by the rails 53 and 54 and slides in the direction of the arrow 40A or 40B while supporting the base chassis 3 via the dampers 11, 12 and 13, and has a width smaller than the disk diameter. Exterior body 5
0 covers the uppermost layer of the second rectangular parallelepiped 50b. The rails 53 and 54 are provided so as to be slidable relative to the rail guides 51 and 52 and the tray 40.

Reference numeral 41 denotes a relay board fixed to the back surface of the tray 40, to which a wiring member 1e from the optical pickup 1 and a wiring member 2c from the disk motor 2 are connected. 42
Is a tray ejecting means fixed to the back surface of the tray 40. Reference numeral 43 denotes a tray cover attached from the lower surface of the tray 40, and the base chassis 3, the dampers 11, 1
2, 13, relay board 41 and tray ejecting means 4
It covers 2. A front bezel 44 is attached to the front of the tray 40 and covers the front of the apparatus when the tray 40 is inserted.

Reference numeral 60 denotes a main board fixed to the back inside the second rectangular parallelepiped 50b of the exterior body 50. Reference numeral 61 denotes a wiring member (F) for connecting the main board 60 and the relay board 41.
PC), a part of which is stuck to the exterior body 50 so as not to be caught when the tray 40 slides, and bent in a U-shape from the stuck portion to the relay board 41 so that the tray 40 slides. Works with actions. Reference numeral 62 denotes an external connection connector provided on the main board 60 toward the rear surface of the exterior body 50. 63 and 64 are main boards 6
An outgoing switch provided on the bottom of the tray 40 is turned on / off by a projection (not shown) on the lower surface of the tray 40, and detects a state in which the tray 40 is completely retracted.

FIG. 11 shows a planar arrangement of each component. The main board 60 fixed to the exterior body 50 is disposed at the innermost position, and the base chassis 3 that is pulled out together with the tray 40 is disposed at the front. Furthermore, the base chassis 3 is arranged at an angle ψ obliquely at which the depth of the entire apparatus becomes minimum when the optical pickup 1 moves to the outermost periphery of the disk 10. As a result, of the triangular spaces formed on both sides of the base chassis 3, the relay substrate 41 is placed in a deep triangular space facing the main substrate 60.
Are arranged in a substantially triangular shape, and a tray ejecting means 42 is arranged in the triangular space in front of the device so as to easily eject the tray 40 from the front bezel 44 on the front of the apparatus.

The main board 6 of the triangular relay board 41
The wiring member 61 from the main board 60
And a connector 41b for connecting a wiring member 2c from the disk motor 2 and a connector 41c for connecting a wiring member 1e from the optical pickup 1 on the remaining two sides, respectively.

Further, since no connector can be arranged near the sharpest apex of this triangular space, this portion cuts the relay board 41 and the damper 13 is arranged instead. In the space opposite to the optical pickup 1, a damper 11 is provided.
Are disposed, and a damper 12 is disposed in a space generated because the driving means 6 provided in parallel with the screw shaft 4 is shorter than the screw shaft 4.

The method of assembling the optical disk device configured as described above will be described below with reference to the drawings. First, an assembling method in the base chassis 3 will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 12, the disk motor 2 is mounted on the base chassis 3 in advance.
1 is fixed, the driving means 6 is attached to the motor bracket 7, and the motor bracket 7 is attached to the base chassis 3.

Next, the screw gear 82 was fixed to the screw shaft 4, the intermediate gear 83 and the thrust spring 14 were mounted on the main shaft support means 21, and both ends of the screw shaft 4 were rotatably mounted on the main shaft support means 21 and the main shaft bracket 23. In this state, the spindle support means 21 and the spindle bracket 23 are attached to the base chassis 3. The counter shaft support means 31 and the counter shaft bracket 33 are also provided in the base chassis 3.
Attach to Then, as shown in FIG. 13, the main shaft coil spring 22 is placed in the main shaft bracket 23 and the sub shaft coil spring 32 is
Is placed in the counter shaft bracket 33.

Next, the spindle inner peripheral end 20a is
3, the main shaft outer peripheral end 20b is in a state of being lifted up as shown by the imaginary line in FIG. 3, and when the sub shaft inner peripheral end 30a is attached to the sub shaft support means 31, it is shown by the imaginary line in FIG. As described above, the outer peripheral end 30b of the sub-shaft is lifted up, and the main shaft 20 and the sub-shaft 30 at this time are substantially parallel. In this state, as shown in FIG. 13, the bearings 1b and 1c of the optical pickup 1 are made to penetrate the raised outer peripheral end 20b of the main shaft 20, and at the same time, the optical pickup is moved to the raised outer peripheral end 30b of the sub shaft 30. The first sub bearing 1d is engaged.

Next, the outer peripheral end 20b of the main shaft is
2, with the spindle cover 24 to which the spindle adjusting screw 25 is attached in advance,
4, the spindle outer peripheral end 20b is sandwiched between the spindle coil spring 22 and the spindle adjustment screw 25 as shown in FIG. When the sub shaft cover 34 to which the sub shaft adjusting screw 35 is attached in advance and the sub shaft cover 34 to which the sub shaft adjusting screw 35 is attached is attached to the sub shaft bracket 33 from above with the sub shaft outer peripheral end 30b lowered onto the sub shaft coil spring 32, as shown in FIG. The outer peripheral end 30b is sandwiched between the counter shaft coil spring 32 and the counter shaft adjusting screw 35.

Next, a tilt adjusting step for adjusting the optical axis 1a of the optical pickup 1 so as to be perpendicular to the recording surface 10a of the disk 10 will be described below. When the spindle adjusting screw 25 of the spindle variable means 26 shown in FIG. 4 is rotated and moved in the direction of the arrow 20A or 20B, the spindle outer peripheral end 20b constantly urged by the spindle coil spring 22 in the direction of the arrow 20A also has the arrow 20A or 20B. Move in the direction. On the other hand, the spindle inner peripheral end 20a is
In FIG. 1, it is fixed and supported as shown by a virtual line in FIG. Therefore, the spindle adjustment screw 2 in the spindle variable means 26
5, the main shaft 20 is rotated by the main shaft support means 21 as a fulcrum, as shown in FIG.
It swings in the direction B '.

Also, by turning the sub shaft adjusting screw 35 in the sub shaft variable means 36 shown in FIG.
When moved in the direction, the sub shaft outer peripheral end 30b constantly urged by the sub shaft coil spring 32 in the direction of arrow 30A also moves in the direction of arrow 30A or 30B. On the other hand, the counter shaft inner peripheral end 30a is fixedly supported by the counter shaft support means 31, as indicated by the phantom line in FIG. Therefore, the sub shaft variable means 3
6, the rotation of the counter shaft adjusting screw 35 is adjusted to
0 swings in the direction of the arrow 30A 'or 30B' with the auxiliary shaft support means 31 as a fulcrum as shown in FIG.

In the tilt adjustment step, first, the spindle variable means 26 is adjusted to move the spindle 20 in the direction of the arrow 20A 'or the arrow so that the reproduction jitter signal read from the recording surface 10a on the disk 10 by the optical pickup 1 is minimized. Adjust to 20B '. The optical pickup 1 has a bearing 1b.
Since the main shaft 20 is fitted with the main shaft 20 by the bearing 1c, the tilt of the optical axis 1a of the optical pickup 1 in the disk radial direction (radial direction) is adjusted to be minimum by the swing of the main shaft 20. This adjustment step is called a radial tilt adjustment step.

Next, to minimize the reproduction jitter signal,
By adjusting the sub-shaft variable means 36, the sub-shaft 30 is adjusted in the direction of the arrow 30A 'or the arrow 30B'. At this time, the tilt of the optical pickup 1 in the disk radial direction (radial direction) does not change, and the optical pickup 1 changes in the disk tangential direction (tangential direction).
Is adjusted to minimize the inclination of. This adjustment step is called a tangential tilt adjustment step.

In the radial tilt adjustment step, the tilt angle of the optical axis 1a in the radial direction is constant regardless of the position of the optical pickup 1 in the radial direction of the disk 10, and the position of the optical pickup 1 at the time of adjustment is Same everywhere.
However, in the tangential tilt adjustment step, the error of the tangential tilt angle of the optical axis 1a increases as the position of the optical pickup 1 at the time of the adjustment is minimized and goes toward the outer circumferential direction or the inner circumferential direction of the disk 10. It is important in which position the optical pickup 1 is held to perform tangential tilt adjustment.

Hereinafter, the tangential tilt adjusting step will be described in detail. FIG. 14 is an arrow 1B in FIG.
FIG. 3 is a diagram schematically illustrating a tilt state in a tangential direction with respect to a recording surface 10a of a disk 10 of a main shaft 20, a sub shaft 30, and an optical pickup 1 as viewed from a direction.

In FIG. 14, the expected maximum inclination angle of the straight line S connecting the main shaft 20 in the main shaft support means 21 and the sub shaft 30 in the sub shaft support means 31 to the recording surface 10a of the disk 10 is Δs degrees, and the main shaft in the optical pickup 1 is 2
The optical axis 1 of the straight line S connecting the contact point with the sub-axis 30 and the contact point with the sub-axis 30
Assuming that the maximum expected inclination angle from 90 degrees with respect to a is Θp degree, the maximum expected inclination angle Θo of the recording surface 10a and the optical axis 1a from 90 degrees is represented by Θo = Θs + Θp (1). The expected maximum tilt angle Θo is a tangential tilt error to be adjusted.

FIG. 15 is a diagram schematically showing the outline of the tangential tilt adjustment. In FIG. 15, L1 is the distance from the sub bearing 1d at the innermost position of the disk 10 of the optical pickup 1 to the sub shaft support means 31, and L2 is the distance from the sub bearing 1d at the outermost position of the disk 10 of the optical pickup 1 to the sub shaft. The distance X to the support means 31 is the distance from the sub-bearing 1d to the sub-shaft support means 31 at the position of the optical pickup 1 at the time of the tangential tilt adjustment. The tangential tilt error having a degree of Θo at the position 31 is adjusted by the sub-axis varying means 36 to change the sub-axis 30
(In this case) in the direction of the arrow 30B 'to make the tangential tilt error of the optical axis 1a at X zero, a residual tilt error of Θ1 degree occurs in L1 and a Θ2 degree occurs in L2. I do. The values of Θ1 and Θ2 are tan (Θ1) = (X−L1) / X · tan (・ o) (2) tan (Θ2) = (L2-X) / X · tan (Θo) (3) is represented by

However, in the actual tangential tilt adjustment step, it is expected that an adjustment error of up to ± Δd degrees will occur due to a read error of the reproduction jitter signal, a work variation in the adjustment step, and the like. Therefore, the maximum value ΘL1 of the total residual tilt error at L1 is a case where the adjustment error angle 生 じ d occurs in the upward direction in FIG.
1) = tan (Θ1) + (L1 / X) · tan (Θd) (4) Similarly, the maximum value ΘL2 of the total residual tilt error at L2 is the adjustment error angle Θd in FIG. This is a case in which it occurs in the downward direction, and is represented by tan (ΘL2) = tan (Θ2) + (L2 / X) · tan (Θd) (5) Here, when the value of X that minimizes the values of ΘL1 and ΘL2 is obtained, X = (1/1) is obtained from (Expression 1), (Expression 2), (Expression 3), (Expression 4), and (Expression 5). 2) {[tan (Θd) / tan (Θs + Θp)] · (L2−L1) + (L2 + L1)} (6), and the position of this X value By carrying out the tangential tilt adjustment step while holding the optical pickup 1 at the same time, the total residual tilt error ΔL1 at the innermost peripheral position of the optical pickup 1 and the total residual tilt error ΔL2 at the outermost peripheral position of the disk are the smallest. Value.

As described above, in the optical disk device of the present embodiment, the main shaft coil spring 22 and the sub shaft coil spring 32, which are the urging means in the main shaft variable device 26 and the sub shaft variable device 36, are conical coil springs. Since the wires can be deformed into a flat shape without interfering with each other at the time of compression, the height of the device can be reduced.

The support / transport system of the optical pickup 1 is controlled by a main shaft 20, a sub shaft 30 and a screw shaft 4.
With this main shaft configuration, the degree of freedom of arrangement of the screw shaft 4 and the driving unit 6 can be increased, and the arrangement configuration including the driving force transmission unit 8 can be optimized for thinning.

Further, the base chassis 3 is provided obliquely with respect to the ray 40, and the relay board 41 and the tray ejecting means 42 are provided in the triangular spaces remaining on both sides, respectively, so that the inside of the thinned device is efficiently provided. The components can be arranged in a space, and the space can be effectively used, and the floor area can be reduced.

In the method of assembling the optical disk device according to the present embodiment, one end of the main shaft 20 and the sub shaft 30 on the inner peripheral side of the disk is connected to the main shaft support means 21 and the sub shaft support means 31.
When the optical pickup 1 is mounted on the main shaft 2, the other ends of the shafts 20 and 30 are lifted upward.
By attaching to the 0 and the countershaft 30, assemblability can be improved.

By optimizing the radial position of the optical pickup 1 in the disk in the tangential tilt adjustment step, the tangential component of the inclination error between the recording surface 10a of the disk 10 and the optical axis 1a of the optical pickup 1 is obtained. The jitter margin can be increased by minimizing the difference between the inner circumference and the outer circumference. The present invention is not limited to the above embodiment, and various applications are possible without departing from the spirit of the present invention. For example, in the present embodiment, the biasing force of the conical coil spring is provided toward the disk, but the same effect can be obtained by a configuration in which the adjusting screw is adjusted from the rear surface of the base chassis in reverse.

[0060]

As described above, according to the optical disk apparatus and the assembling method of the present invention, the height of the coil spring at the time of maximum compression is reduced by using a conical coil spring as the urging member of the guide shaft changing means. By arranging the guide shaft adjusting screw outside the outer periphery of the disk and obliquely arranging the guide shaft, the outer body can be formed into the smallest square shape including the disk diameter, In addition, since the support / transport system of the optical pickup has a three-shaft configuration including a main shaft, a sub-shaft, and a screw shaft, the driving means and the driving force transmitting means for the screw shaft can be optimally laid out and further reduced in thickness. In addition, by fitting the optical pickup with the ends of the main shaft and sub shaft protruding upward, the mounting of the optical pickup is facilitated and the assemblability is improved. By optimizing the position of the optical pickup in the radial direction of the optical pickup in the tangential tilt adjustment step, the inner circumference of the tangential component of the tilt error between the recording surface of the optical disc and the optical axis of the optical pickup can be improved. An excellent effect that the jitter margin is increased by minimizing the difference between the outer peripheries and the performance can be improved can be obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a partially transparent perspective view showing a configuration of a base chassis portion of an optical disk device.

FIG. 2 is a partial side view showing a relationship between a sub bearing and a sub shaft in FIG.

FIG. 3 is a partial cross-sectional view showing a configuration of a spindle supporting means in FIG. 1;

FIG. 4 is a partial cross-sectional view showing a configuration of a main shaft variable unit in FIG. 1;

FIG. 5 is a partial sectional view showing a configuration of a conical coil spring portion in FIG. 1;

FIG. 6 is a partial cross-sectional view showing a configuration of a countershaft support means in FIG. 1;

FIG. 7 is a partial cross-sectional view showing a configuration of a sub shaft variable unit in FIG.

FIG. 8 is a schematic diagram showing a configuration of a driving unit and a driving force transmitting unit in FIG. 1;

FIG. 9 is a partially transparent perspective view showing the entire configuration of the optical disc device.

10 is a schematic partial cross-sectional view of the optical disk device in FIG. 9 as viewed from the front.

11 is a transparent plan view of the optical disk device in FIG. 9 as viewed from above.

FIG. 12 is a perspective view showing an optical pickup assembling method of a base chassis of the optical disk device in FIG. 1;

FIG. 13 is a perspective view showing an optical pickup assembling method of the base chassis of the optical disk device in FIG. 1;

FIG. 14 is a schematic view showing a tilted state in a tangential direction with respect to a disk recording surface of the optical pickup and a main axis and a sub-axis in FIG. 1;

FIG. 15 is a schematic diagram showing an outline of a tangential tilt adjustment step in the method of assembling the optical disk device of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical pickup 1a Optical axis 1e Wiring member 1f Curved receiving surface 2 Disk motor 2c Wiring member 3 Base chassis 4 Screw shaft 5 Nut member 6 Driving means 8 Driving force transmission means 10 Disk 10a Recording surface 14 Thrust spring 20 Main shaft (guide shaft) 20a Main shaft inner peripheral end (one end) 20b Main shaft outer peripheral end (other end) 20M moment 21 Main shaft support means (guide shaft support means) 22 Main shaft coil spring (guide shaft coil spring) 25 Main shaft adjustment screw (guide shaft adjustment screw) 26 Main shaft variable means ( Guide shaft variable means) 30 Sub shaft (guide shaft) 30a Sub shaft inner peripheral end (one end) 30b Sub shaft outer peripheral end (other end) 30M Moment 31 Sub shaft support means (guide shaft support means) 32 Sub shaft coil spring (guide shaft) Coil spring) 35 Counter shaft adjusting screw (Guide shaft adjusting screw) 36 Counter shaft Varying means (guide axis changing means) 40 Tray 41 relay board 42 the tray ejecting means 43 tray cover 44 front bezel 50 outer body 60 the main board 61 wiring member

Continuation of front page (72) Inventor Junya Aso 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. A guide shaft for supporting an optical pickup and guiding movement in the radial direction of a disk, and guide shaft variable means for supporting an end of the guide shaft on the outer peripheral side of the disk so as to be adjustable in a direction facing the disk. The guide shaft changing means has a configuration in which a conical guide shaft coil spring and a guide shaft adjusting screw are arranged to face each other with the guide shaft interposed therebetween, and the conical guide shaft coil spring is viewed from the axial direction. An optical disk device having a spiral shape, wherein at the time of maximum compression, wires can be deformed into a flat shape without interfering with each other. 2. The optical disk device according to claim 1, wherein the guide shaft adjusting screw is disposed outside the outer periphery of the disk. 3. A nut member provided on the optical pickup,
A screw shaft which is provided substantially parallel to the guide shaft and engages with the nut member to transfer the optical pickup from the inner circumference to the outer circumference of the disk; a driving means for rotating the screw shaft; and a driving force of the driving means. Driving force transmitting means for transmitting to a screw shaft, a base chassis supporting the guide shaft, the guide shaft variable means, the screw shaft and the driving means together with an optical pickup and a disk motor, a wiring member from the optical pickup and a disk A relay board for connecting a wiring member from a motor, a tray ejecting means for enabling a loading operation of the tray, and a tray for supporting the tray ejecting means, the base chassis and the relay board within an overall width smaller than a disk diameter; And distribution from the relay board. A main board for connecting members, and an exterior body supporting the main board and supporting the tray so as to be able to perform a loading operation, wherein the exterior body is arranged with the main board at the back and the tray at the front, In the tray, the base chassis is arranged obliquely, whereby the relay board is arranged in a space facing the main board in the back of each triangular space left on both sides, and the tray ejecting means is arranged in a space in front. 3. The optical disk device according to claim 1, wherein: 4. A guide shaft for supporting an optical pickup and guiding movement in a disk radial direction, and guide shaft support means for supporting an end portion of the guide shaft on the inner peripheral side of the disk. The opening of the means for inserting the guide shaft is larger than the guide shaft when viewed from obliquely above, and smaller than the guide shaft when viewed from the horizontal direction, and one end of the guide shaft is attached to the guide shaft support means. An optical disc device characterized in that, when inserted from obliquely above, the other end of the guide shaft stops and floats upward. 5. The two guide shafts respectively supporting both ends of the optical pickup, one end of each of which is attached to the guide shaft support means, and the other end thereof is lifted upward in a state substantially parallel to each other. The optical disk device according to claim 4, wherein 6. After the guide shaft is attached to the guide shaft supporting means, the reaction force when the guide shaft is pushed down horizontally to attach the floating outer end to the guide shaft variable means has a conical shape. 2. The structure according to claim 1, wherein the guide shaft coil spring operates in the same direction as the biasing direction.
Or the optical disk device according to 4. 7. A guide shaft that supports an optical pickup and guides movement in a disk radial direction, and guide shaft variable means that adjustably supports an end of the guide shaft on an outer peripheral side of the disk in a direction facing the disk. An optical pickup device, wherein only the inner end of the guide shaft on the inner side of the disk is attached to the guide shaft support means, and the optical pickup is mounted while the outer end of the disk is lifted upward. Method. 8. A main shaft that supports the optical pickup and guides movement in the radial direction of the disc, a sub shaft that is provided substantially parallel to the main shaft, and supports a point on the opposite side of the main shaft of the optical pickup, and a sub shaft. Sub-shaft variable means for supporting the end of the outer peripheral side of the disk so as to be adjustable in a direction facing the disk;
A method of assembling an optical disk device comprising: a sub-shaft supporting means for supporting an end of the sub-shaft on the inner peripheral side of the disk and serving as a fulcrum for swinging of the sub-shaft by the sub-shaft variable means. A tangential tilt adjustment step of adjusting the sub-axis variable means so as to minimize a tilt error in the tangential direction between the disc and the recording surface of the disc, and a disc radius of the optical pickup in the tangential tilt adjustment step. The directional position is defined by the maximum predicted inclination angle of a straight line connecting the main axis of the main shaft support means and the sub-axis of the sub-shaft support means with respect to the disk recording surface ± Θ.
s, ± Θp the predicted maximum inclination angle from 90 degrees with respect to the optical axis of a straight line connecting the contact point with the main axis and the contact point with the sub-axis in the optical pickup, from the sub-bearing portion of the optical pickup at the innermost position of the disk The distance from the sub-shaft supporting means to the sub-shaft supporting means is L1, and the distance from the sub-bearing portion of the optical pickup at the outermost position of the disk to the sub-shaft supporting means is L.
2. When the distance from the sub-bearing portion of the optical pickup to the sub-shaft support means at the time of the tangential tilt adjustment is X and the predicted maximum adjustment error angle in the tangential tilt adjustment step is ± Θd, X = ( 1/2) ｛[tan (Θd) / tan (Θs + Θ
p)] · (L2−L1) + (L2 + L1)｝. 9. A spindle variable means for supporting an end of the spindle on the outer peripheral side of the disk so as to be adjustable in a direction facing the disk;
Main shaft supporting means for supporting an end of the main shaft on the inner peripheral side of the disk and serving as a fulcrum for swinging of the main shaft by the main shaft variable means, wherein the optical axis of the optical pickup and the recording surface of the disk in the disk radial direction are 9. The method for assembling an optical disk device according to claim 8, further comprising a radial tilt adjustment step of adjusting said spindle variable means so as to minimize an inclination error.