JP2000057683A - Disk recording and/or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk recording and/or reproducing device whose reliability is high by making a perpendicularity error and a misaligment to be correctable for every disk. SOLUTION: A table 21 is fixed to the rotary shaft 3 of a spindle motor 5 and a disk 1 is mounted on the table 21. Moreover, a spindle motor supporting member 23 is stuck to the upper end part of the body f the spindle motor 25. The interval between the spindle motor supporting member 23 and a chassis 25 is supported by a parallel mechanism 10 in which kinematic pair consisting of straight motion shafts 27 composed of piezoelectric elements and elastic members 29A, 29B are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disc recording and / or disc recording.
More particularly, the present invention relates to a highly reliable disk recording and / or reproducing apparatus capable of correcting a squareness error and a positional shift for each disk.

[0002]

2. Description of the Related Art The principle of a disk recording and / or reproducing apparatus will be briefly described with reference to FIGS. In FIG. 3, the disk 1 is rotated at high speed by a spindle motor 5 around the axis of the rotating shaft 3. Disk 1 is C
An optical disk such as D or DVD. A pickup 7 is provided for irradiating a recording surface of the disk 1 for signal recording with laser light and receiving the laser light reflected on the recording surface. The value of the deviation when the angle formed by the optical axis 9 of the laser beam emitted from the pickup 7 with the recording surface of the disk 1 deviates from 90 degrees is the squareness.

[0003] On the other hand, in FIG.
In order to track the data recorded on the disk 1, the optical axis 9 moves along a guide rail (not shown) so as to be parallel to the disk 1 and move from the inner circumference to the outer circumference of the disk 1. At this time, it is ideal that the curvature center 11 of the signal track formed on the recording surface of the disk 1 is located on an extension of the movement locus of the point where the optical axis 9 intersects the recording surface of the disk 1. Generally, a position error occurs due to a problem at the time or the like.

In order to quantify the magnitude of this position error,
A distance (hereinafter referred to as misalignment) between an extension of a movement locus of a point where the optical axis 9 intersects the recording surface of the disk 1 and a center of curvature 11 of a signal track formed on the recording surface of the disk 1 is defined. . For reliable signal recording and / or signal reading, the squareness and misalignment values must be kept within acceptable ranges.

For this reason, in the conventional disk recording / reproducing apparatus, an inclination adjusting mechanism 13 as shown in FIG. 5 is provided on a pedestal of the spindle motor 5 to adjust the inclination in a production process, or to record and / or record signals. The apparatus includes tilt servo control means for detecting the squareness during reading and controlling the orientation of the entire pickup 7 and its guide rails so that the squareness becomes zero. Further, a guide rail adjusting mechanism (not shown) for adjusting the direction of the guide rail of the pickup 7 is provided.

[0006]

However, in the conventional tilt adjusting mechanism 13 and guide rail adjusting mechanism, the squareness error and the center error caused by the shape error and the assembly error of the rotating mechanism component of the disk 1 and the driving mechanism component of the pickup 7 are not considered. It is possible to correct the deviation for each disk recording / reproducing apparatus, but it is not possible to correct the squareness error and the misalignment caused by the unspecified warpage of the disk 1 and the eccentricity of the center hole and the center of curvature 11 of the signal track. Had.

Further, the conventional tilt servo control means changes the direction of the entire pickup 7 and its guide rails, so that the inertia of the control target is large, the response of the control system is low, and the high speed which rotates the disk 1 at high speed is used. The disk recording / reproducing apparatus has a drawback that the squareness cannot follow zero.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and it is possible to correct a squareness error and / or a misalignment for each disk recording and / or reproducing apparatus and also for each disk. It is an object of the present invention to provide a disk recording and / or reproducing apparatus capable of causing a right angle to follow 0 even in a high-speed disk recording and / or reproducing apparatus which rotates the disk at high speed.

[0009]

SUMMARY OF THE INVENTION Therefore, the present invention provides a pickup for irradiating a recording surface of a disk with laser light and receiving the laser light reflected on the recording surface, and a laser for irradiating the laser light emitted from the pickup. A squareness detecting means for detecting a squareness between the optical axis and the recording surface of the disk, a disk mounting means for mounting the disk, a rotating means for rotating the disk mounting means, and a rotating means. A rotating means supporting member to be supported, a plurality of linear motion shafts that expand and contract by driving a piezoelectric element between the rotating means supporting member and the chassis, and expansion and contraction of the linear motion shaft are transmitted to the chassis and the rotating means supporting member. A parallel mechanism provided with a predetermined number of even pairs, and driving the linear motion shaft so that the squareness detected by the squareness detecting means is 0 or within a predetermined allowable range, and And configured to include a control means for adjusting the inclination and / or spatial position of the support member.

[0010] The disk mounting means is all means for mounting a disk. A plurality of linear motion shafts to which the piezoelectric element is applied and a predetermined number of pairs for transmitting expansion and contraction of the linear motion shaft to the chassis and the rotation device support member are provided between the rotation device support member and the chassis. The direct acting shaft to which the piezoelectric element is applied includes a case where the piezoelectric element is embedded in a resin or the like, a case where a plurality of piezoelectric elements are connected, and a case where the piezoelectric element is directly used as the direct acting shaft. Think.

In the method of disposing the linear motion shaft and the pair, for example, the rotation means support member and the chassis are fixed to both ends of each linear motion shaft via the pair. Alternatively, the linear motion shaft may be disposed in parallel with the chassis, a pair may be fixed in the middle of the linear motion shaft, and the rotation means supporting member may be fixed via the pair fixed to the rotating means support member via a bar fixed to the pair. Good.

The perpendicularity detecting means detects a perpendicularity between the optical axis of the laser beam emitted from the pickup and a predetermined range of the recording surface of the disk. This perpendicularity is desirably 0. If the perpendicularity becomes large due to the warpage of the disk or the like, data cannot be accurately extracted from the recording surface of the disk.
Therefore, the squareness is 0 or within a predetermined allowable range (0
The linear motion shaft is driven so as to adjust the inclination and / or the spatial position of the rotation means supporting member so that the error range is close to the above.

[0013] This makes it possible to correct the squareness error caused by the warpage of the disk for each disk. For this reason, the reliability of signal recording and / or signal reading of the disk can be improved.

[0014] The present invention also relates to the present invention, wherein an extension line of a locus of movement of an optical axis of the laser light in accordance with movement of the pickup toward a rotation center direction of the disk and a center of curvature of a signal track on a recording surface of the disk. Further comprising a misalignment detecting means for detecting a distance, wherein the control means is such that the squareness detected by the squareness detecting means and the misalignment detected by the misalignment detecting means are respectively 0 or within a preset allowable range. The linear drive shaft is driven to adjust the inclination and / or the spatial position of the rotating means support member.

A misalignment detecting means is provided in addition to the perpendicularity detecting means. The misalignment detecting means detects a misalignment value which is a distance between an extension line of a movement path of the pickup toward a rotation center direction of the disk and a center of curvature of a signal track on a recording surface of the disk. The value of the misalignment is also preferably 0. If the value of the misalignment increases due to the eccentricity of the center hole of the disk or the center of curvature of the signal track, data cannot be accurately extracted from the recording surface of the disk.

Therefore, the values of the squareness and the misalignment are each 0 or within a predetermined allowable range (error range close to 0).
The linear motion shaft is driven so as to adjust the inclination and / or the spatial position of the rotating means support member.

As described above, the perpendicularity error and the misalignment caused by the unspecified disk warp and the eccentricity of the center hole and the center of curvature of the signal track can be corrected for each disk. It is possible to provide a disk recording and / or reproducing apparatus with high reliability for signal reading.

Further, according to the present invention, there is provided a pickup for irradiating a recording surface of a disk with laser light and receiving the laser light reflected on the recording surface, and the movement of the pickup toward the center of rotation of the disk. Misalignment detecting means for detecting a distance between an extension of a movement locus of the optical axis of the laser beam and the center of curvature of a signal track on a recording surface of the disk, and a disk mounting means for mounting the disk;
A rotating means for rotating and driving the disk mounting means, a rotating means supporting member for supporting the rotating means, a plurality of linear motion shafts for expanding and contracting by driving a piezoelectric element between the rotating means supporting member and the chassis; A parallel mechanism provided with a predetermined number of even pairs for transmitting expansion and contraction of the linear motion shaft to the chassis and the rotating means support member, and a misalignment detected by the misalignment detecting means being 0 or within a preset allowable range. The linear drive shaft is driven so that the inclination of the rotation means support member and / or
Alternatively, the apparatus is provided with control means for adjusting the spatial position.

A linear displacement shaft is driven so that the value of the misalignment is 0 or within a preset allowable range (error range close to 0).
Or adjust the spatial position.

As described above, the misalignment caused by the eccentricity of the center hole of the unspecified disk and the center of curvature of the signal track can be corrected for each disk.
It is possible to provide a disk recording and / or reproducing apparatus with high reliability regarding signal recording and / or signal reading of a disk.

Although it is possible to use a ball pair that moves with three degrees of freedom around a point for such a pair, the present invention is characterized in that an elastic member is used for the pair. .

Since the elastic members are used in pairs, the degree of freedom can be obtained by the elastic strain of the elastic members. Therefore, it is possible to eliminate the play between the elements connected to the pair as in the case of using the ball pair.

As a result, since there is little play evenly, the control accuracy of the tilt servo control system is high, and the squareness and / or misalignment can follow zero with high accuracy.

The present invention is applicable not only to a disk recording-only device or a disk reproduction-only device but also to a disk recording and reproducing device.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration diagram of an embodiment of the present invention.

The same elements as those in FIGS. 3 to 5 are denoted by the same reference numerals, and description thereof is omitted. In FIG. 1, a table 21 is fixed to a rotating shaft 3 of a spindle motor 5. The table 21 corresponds to a disk mounting means,
The spindle motor 5 corresponds to a rotating unit. The disk 1 is placed on the table 21.

A spindle motor support member 23 is fixed to the upper end of the main body of the spindle motor 5. The spindle motor support member 23 corresponds to a rotation means support member. The spindle motor support member 23 and the chassis 25
Is supported by the parallel mechanism 10. FIG. 2 is a partially enlarged view of the parallel mechanism.

In FIG. 2, the translation shaft 27 is constituted by a piezoelectric element. Six linear motion shafts 27 are provided between the spindle motor support member 23 and the chassis 25. Both ends of the linear motion shaft 27 are fixed to the spindle motor support member 23 and the chassis 25 via elastic members 29A and 29B, respectively. The elastic members 29A, 29B
A degree of freedom is obtained by elastic strain, which is equivalent to a pair.

Next, the operation will be described. The signals from the squareness detector and the misalignment detector are input to a digital signal processor (not shown). The squareness detector and the misalignment detector are the same as those conventionally used. In this digital signal processor, the command value of the axial position of each linear motion shaft 27 is set so that the values of the squareness and the misalignment are respectively 0 or within a preset allowable range (ideally 0). Calculate. Then, each linear motion shaft 27 is piezoelectrically driven so that the command value and the axial position of each linear motion shaft 27 match.

The amount of expansion and contraction of the piezoelectric element of the linear motion shaft 27 in the axial direction changes according to the applied voltage. Elastic members 29A and 29B are provided at both ends of each linear motion shaft 27. The elastic members 29A and 29B transmit expansion and contraction of the linear motion shaft 27 to the spindle motor support member 23 and the chassis 25. Elastic member 29
A and 29B are metals such as bronze and aluminum, for example. Then, this series of operations is continuously repeated while signal recording and / or signal reading is performed.

With the above-described method, it is possible to correct the squareness error and the misalignment caused by the unspecified disk warpage and the eccentricity of the center hole and the center of curvature of the signal track for each disk. Therefore, the reliability of signal recording and / or signal reading can be improved.

Further, since the inclination of the spindle motor 5 is adjusted by a parallel mechanism having no play, the control accuracy of the tilt servo control system is high, and the squareness and the misalignment can follow zero with high accuracy.

It should be noted that the present invention includes a disk recording and reproducing apparatus as well as a disk recording and reproducing apparatus.

In this embodiment, the parallel mechanism 1
Although the configuration of 0 has been described assuming that the number of the linear motion shafts 27 is 6, the present invention is not limited to this. The method of disposing the linear motion shaft 27 is not limited to the configuration shown in FIG. 1. For example, the linear motion shaft 27 is disposed in parallel with the chassis 25, and its expansion and contraction is performed on the spindle motor support member 23 side by a pair via a pair via a pair. It is also possible to use other methods such as communication. Elastic members 29A, 29
One of B can be configured as a pair of balls.

[0035]

As described above, according to the present invention, the squareness error and the misalignment caused by the warpage of the disk can be corrected for each disk. Therefore, the reliability of signal recording and / or signal reading of the disk can be improved.

[0036]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of a parallel mechanism.

FIG. 3 is a simplified side view illustrating the principle of a disc recording and / or reproducing apparatus.

FIG. 4 is a simplified plan view illustrating the principle of a disk recording and / or reproducing apparatus.

FIG. 5 shows a conventional tilt adjusting mechanism.

[Explanation of symbols]

 Reference Signs List 1 disc 3 rotating shaft 5 spindle motor 7 pickup 9 optical axis 10 parallel mechanism 11 center of curvature of signal track 13 tilt adjusting mechanism 21 table 23 spindle motor support member 25 chassis 27 linear motion shaft 29A, 29B elastic member

Continued on the front page (72) Inventor Toki Eiji 4-3-1 Yashiki, Narashino-shi, Chiba Seiko Seiki Co., Ltd. (72) Inventor Ikuo Muto 4-3-1, Yashiki, Narashino-shi, Chiba Seiko Seiki Co., Ltd. In-house (72) Inventor Shuji Kamiya 4-3-1 Yashiki, Narashino-shi, Chiba F-term (reference) in Seiko Seiki Co., Ltd. 5D109 CA03 5H303 AA22 BB03 BB06 CC01 DD01 DD14 DD26 GG11 HH02 5H607 BB01 CC03 CC05 EE51 FF01 HH01 HH08

Claims (4)

[Claims] 1. A pickup for irradiating a recording surface of a disk with laser light and receiving the laser light reflected on the recording surface, and an optical axis of the laser light emitted from the pickup forms a recording surface of the disk. Squareness detecting means for detecting a squareness, disk mounting means for mounting the disk, rotating means for rotating the disk mounting means, rotating means supporting member for supporting the rotating means, and rotation A plurality of parallel-acting shafts, which are arranged between a means supporting member and a chassis and extend and contract by driving a piezoelectric element, and a predetermined number of pairs for transmitting expansion and contraction of the linear moving shaft to the chassis and the rotating means supporting member. A mechanism, and driving the linear motion shaft so that the squareness detected by the squareness detecting means is 0 or within a predetermined allowable range, and adjusts the inclination and / or spatial position of the rotating means supporting member. A disk recording and / or reproducing apparatus, comprising: a control unit for adjusting. 2. A distance between an extension line of a movement locus of an optical axis of the laser light along with movement of the pickup toward a rotation center direction of the disk and a center of curvature of a signal track on a recording surface of the disk is detected. Further comprising a misalignment detecting means, wherein the control means controls the linear movement so that the squareness detected by the perpendicularity detecting means and the misalignment detected by the misalignment detecting means are respectively 0 or within a preset allowable range. 2. The disk recording and / or reproducing apparatus according to claim 1, wherein a shaft is driven to adjust a tilt and / or a spatial position of the rotating means support member. 3. A pickup for irradiating a recording surface of a disk with a laser beam and receiving the laser beam reflected on the recording surface, and a pickup for receiving the laser beam toward the rotation center of the disk. Eccentricity detecting means for detecting a distance between an extended line of the movement trajectory of the optical axis and the center of curvature of the signal track on the recording surface of the disk; disk mounting means for mounting the disk; and disk mounting means. A rotating means for rotating, a rotating means supporting member for supporting the rotating means, a plurality of direct-acting shafts extending and contracting by driving a piezoelectric element between the rotating means supporting member and the chassis; A parallel mechanism for transmitting a predetermined number of pairs to the chassis and the rotating means support member, and a misalignment detected by the misalignment detecting means being zero or a predetermined tolerance. A disk recording and / or reproducing apparatus, comprising: control means for driving the linear motion shaft so as to fall within the range and adjusting the inclination and / or the spatial position of the rotating means support member. 4. The disc recording and / or reproducing apparatus according to claim 1, wherein an elastic member is used for the pair.