JP3564269B2 - Disk drive - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a disk drive device for reading or writing information from or to a disk-shaped recording medium, and more particularly to a tilt adjustment mechanism for adjusting an angle of an optical pickup with respect to a disk surface.
[0002]
[Prior art]
The configuration of a conventional optical disk drive will be described with reference to FIGS. FIG. 2A is a plan view of the optical disk drive, and FIG. 2B is a cross-sectional view of the optical disk drive as viewed from line AA ′ in the direction of arrow Y.
2. Description of the Related Art Conventionally, an optical disk drive comprises an optical pickup 1 for irradiating an optical disk with light to read or write information, and a turntable 2a for mounting the optical disk.
, A disk rotation drive unit 2 comprising a spindle motor 2b for rotating a turntable, an optical pickup drive unit 3 for carriage-driving the optical pickup 1 in the radial direction of the disk, and a pair of shafts 4a, 4a supporting the optical pickup 1. 4b, a tilt adjustment mechanism 5 for adjusting the tilt of the optical pickup 1 by adjusting the height of one end a, b of each of the shafts 4a, 4b, a disk rotation drive 2, and an optical pickup drive 3 and a substrate section 6 on which the support sections 4a and 4b are placed.
[0003]
The optical pickup driving unit 3 includes a connection leaf spring 3b having a projection 3a, a lead screw 3d having a screw-shaped threaded recess 3c engaged with the projection 3a of the connection leaf spring 3b, and a lead screw 3d. Is provided with a stepping motor 3e for rotationally driving the motor. The coupling leaf spring 3b is attached to the optical pickup 1 so as to be driven integrally with the entire body of the optical pickup 1, and the projection 3a of the coupling leaf spring 3b engages with the recess 3c of the lead screw 3d. Then, a predetermined urging force is applied to the lead screw 3d. Lead screw 3d
Is installed so as to drive the optical pickup 1 in directions indicated by arrows ± Y in FIG.
[0004]
FIG. 3 is an enlarged view showing the engagement between the projection 3a of the connecting leaf spring 3b and the recess 3c of the lead screw 3d. The projection 3a of the connection leaf spring 3b engages with the recess 3c of the lead screw 3d. In accordance with the rotation of the lead screw 3d, the convex portion 3a engaging with the concave portion 3c receives a driving force pulled in the direction of the arrow ± Y, and is configured to drive the connecting leaf spring 3b.
[0005]
Further, a supporting portion for supporting the optical pickup 1 includes a main shaft 4a and a sub shaft 4b provided substantially parallel to the lead screw 3d, and one ends a and b of the shafts 4a and 4b are connected to a substrate portion. 6 is mounted to be vertically movable.
The tilt adjusting mechanism 5 adjusts the angles of the shafts 4a and 4b with respect to the disk surface by finely adjusting the heights of the ends a and b of the main shaft 4a and the sub shaft 4b, respectively. A main shaft tilt adjusting screw 5a for adjusting the angle of the main shaft 4a, a sub shaft tilt adjusting screw 5b for adjusting the sub shaft angle, and biasing members provided at the ends a and b of the main shaft 4a and the sub shaft 4b, respectively. It has springs 5c and 5d. The biasing springs 5c and 5d bias the adjusting screws 5a and 5b in directions opposite to the tightening direction, respectively. In FIG. 2B, the shafts 4a and 4b are attached in directions indicated by arrows + Z. It is a force.
In the above configuration, the tilt adjustment of the optical pickup 1 is performed by adjusting the angle of the support 4 by the tilt adjustment mechanism 5.
[0006]
[Problems to be solved by the invention]
However, when the height or angle of the one end a, b of the main shaft 4a or the sub shaft 4b is changed for tilt adjustment, the height or angle of the connecting plate spring 3b with respect to the lead screw 3d also changes. The force (lateral pressure) applied by the spring 3b to the lead screw 3d changes.
[0007]
The lateral pressure applied to the lead screw 3d by the connecting leaf spring 3b is one factor that determines the maximum response frequency of the optical pickup driving unit. Note that the maximum response frequency generally indicates the maximum drive force that can be transmitted by an optical pickup drive unit having a stepping motor, and is closely related to the maximum drive speed of the optical pickup. FIG. 4 shows the relationship between the change in the lateral pressure and the maximum response frequency in the configuration shown in FIG. In FIG. 4, the horizontal axis is the lateral pressure, the unit is force [g weight], the vertical axis is the maximum response frequency, and the unit is the number of pulses input per second [PPS]. FIG. 4 shows that when the lateral pressure is about 21 [g weight], the maximum response frequency is about 1440 [PPS] at the maximum, and that the most ideal response is realized. Further, it is shown that the maximum response frequency is significantly lowered regardless of whether the lateral pressure is larger or smaller than about 21 [g weight].
[0008]
Therefore, in the above-described structure, there is a problem that the lateral pressure of each disk drive changes due to the adjustment degree of the tilt adjustment performed at the time of manufacturing the disk drive, and the maximum drive speed of the optical pickup changes. Was.
[0009]
The present invention has been made in view of the above-described problem. Even if the height of the main shaft 4a and the sub shaft 4b is adjusted by the tilt adjusting mechanism, the positional relationship between the connecting leaf spring and the lead screw does not change. The present invention provides an optical disk drive that does not change. That is, by adjusting the angle of the support section by the tilt adjustment mechanism section, an optical disk drive is provided in which the maximum response frequency of the optical pickup drive section is not affected.
[0010]
[Means for Solving the Problems]
An object of the present invention is to solve the above-mentioned problem, and an invention according to claim 1 is a pickup that reads or writes information from a disk-shaped recording medium, a disk rotation driving unit that drives a disk to rotate, and a disk drive that rotates the disk. A pickup driving unit for driving and controlling the pickup in a radial direction, a supporting unit for slidably supporting the pickup, a tilt adjusting mechanism for adjusting the angle of the pickup with respect to the disk surface, and a supporting unit and a pickup driving unit. A sub-substrate unit, a substrate unit on which a sub-substrate unit, a disk rotation drive unit, and a pickup drive unit are mounted, wherein the support unit includes a pair of support units, and one of the support units is the sub-substrate unit. And the other of the support portions is mounted on the substrate portion, and the tilt adjustment mechanism portion adjusts the angle of the sub-substrate portion. Characterized by the tilt adjustment of the pickup by that the other angle adjusting of the supporting part.
[0011]
According to a second aspect of the present invention, in the disk drive according to the first aspect, the pickup driving section includes a connecting leaf spring having a convex portion that is driven integrally with the pickup, and a screw-shaped engaging portion that engages with the convex portion of the connecting leaf spring. And a stepping motor for driving the lead screw to rotate .
[0013]
According to a third aspect of the present invention, in the disk drive according to the first or second aspect, the tilt adjustment mechanism section includes a sub-board adjustment screw for adjusting an angle of the sub-board section with respect to the disk surface; It is characterized by comprising a support portion adjusting screw for adjusting the angle with respect to the other disk surface, and an urging spring for urging in a direction opposite to the screwing direction of each adjusting screw .
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a configuration of an optical disk drive according to an embodiment of the present invention. 1A is a plan view of the optical disk drive, FIG. 1B is a side view of the main part of the optical disk drive viewed in the direction of arrow X, and FIG. FIG. 4 is a cross-sectional view as viewed in the direction of arrow Y from −B ′.
[0019]
The optical disk drive shown in FIG. 1 includes an optical pickup 1 for irradiating an optical disk with light to read or write information, a disk rotation drive unit 2 for rotating the optical disk, and a light for driving the optical pickup 1 in a radial direction of the disk. A pickup driving unit 3, a support unit for supporting the optical pickup 1 including a main shaft 4a and a sub shaft 4b, a sub-substrate unit 7 on which the main shaft 4a and the optical pickup driving unit 3 are mounted, a sub-substrate unit 7 and a sub-shaft 4b A tilt adjusting mechanism 5 ′ for adjusting the tilt of the optical pickup 1 by adjusting the height of one end of the optical pickup 1, and a substrate section 6 on which the sub-substrate section 7, the sub shaft 4 b and the disk rotation drive section 2 are placed. I have. Note that the same components as those of the related art are denoted by the same reference numerals, and description thereof is omitted.
[0020]
The sub-board unit 7 includes a sub-board 7a and a plastic rivet 7b. One end of the sub-board 7a is attached to the board section 6 by a plastic rivet 7b, and the other end e is attached to the board section 6 so as to be vertically movable.
Both ends of the main shaft 4a of the support portion are fixed to the sub-board 7a, and the sub-shaft 4b is attached to the board portion 6 so that one end b can move up and down.
[0021]
The tilt adjusting mechanism 5 'adjusts the angle of the sub-shaft 4b and the sub-board 7a with respect to the disk surface by finely adjusting the heights of the respective ends b and e of the sub-shaft 4b and the sub-board 7a. A sub-board adjusting screw 5e for adjusting the angle of the sub-board 7a, a sub-axis tilt adjusting screw 5b for adjusting the angle of the sub-shaft 4b, and the other end of the sub-board 7a and the sub-shaft 4b. There are provided urging springs 5f and 5d. The biasing springs 5f and 5d bias the adjusting screws 5e and 5b in a direction opposite to the tightening direction, and in FIG. 1C, the sub shaft 4b and the one ends b and e of the sub substrate 7a. Each is urged in the direction of the arrow + Z.
[0022]
A method of adjusting the tilt of the disk drive in the above configuration will be described. The height of one end e of the sub-board 7a and one end b of the sub-shaft 4b is adjusted by adjusting the degree of tightening of the sub-board adjustment screw 5e and the sub-axis tilt adjustment screw 5b of the tilt adjustment mechanism 5 '. The angle adjustment with respect to the disk surface of the sub-board 7a and the auxiliary shaft 4b is performed, and the tilt adjustment of the optical pickup 1 with respect to the optical disk surface is performed.
[0023]
Here, when the angle of the sub-board 7a is adjusted by the sub-board adjusting screw 5e, the connecting leaf spring 3b and the lead screw 3d move together with the sub-board 7a. Therefore, at the time of assembling, the positional relationship between the connecting leaf spring 3b and the lead screw 3d, which are once optimally arranged, is kept unchanged by the subsequent tilt adjustment. Therefore, it is possible to prevent a decrease in the maximum response frequency of the optical pickup driving unit due to a change in the lateral pressure applied to the lead screw 3d by the connecting leaf spring 3b.
[0024]
In the present embodiment, the tilt adjustment between the sub-shaft and the sub-substrate is independently performed by providing the sub-axis on the substrate. However, by forming the sub-substrate, the support, and the tilt adjusting mechanism with high precision, not only the main shaft but also the sub-shaft are provided on the sub-substrate, and the support and the tilt adjusting mechanism are integrated. You may make it move.
[0025]
【The invention's effect】
As described above, according to this onset bright, it is possible to prevent the influence on the maximum response frequency of the pickup drive unit may occur.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an optical disk drive of the present invention.
FIG. 2 is a diagram showing a conventional optical disk drive.
FIG. 3 is a view showing engagement between a convex portion 3a of a connecting leaf spring 3b and a concave portion 3c of a lead screw 3d. FIG. 4 shows a pressure (side pressure) applied to the lead screw by the connecting leaf spring and a response of an optical pickup driving section. The figure which shows the relationship with a speed (response frequency).
[Explanation of symbols]
Reference Signs List 1 optical pickup 3 optical pickup driving unit 3b connecting leaf spring 3d lead screw 3e stepping motor 4 support unit 4a main shaft 4b sub shaft 5, 5 ' tilt adjusting mechanism unit 5b sub shaft tilt adjusting screw
5c, 5d, 5f Urging spring 5e Sub board adjustment screw
7a sub-board

Claims (3)

A pickup for reading or writing information from a disk-shaped recording medium, a disk rotation drive for rotating the disk, a pickup drive for controlling the drive of the disk in a radial direction of the disk, and slidably moving the pickup. A support portion for supporting, a tilt adjustment mechanism for adjusting the angle of the pickup with respect to the disk surface, a sub-board portion on which the support portion and the pickup drive portion are mounted, and a sub-board portion and the disk rotation drive Unit and a substrate unit on which the pickup drive unit is mounted,
The support portion includes a pair of support portions, one of the support portions is mounted on the sub-substrate portion, and the other of the support portions is mounted on the substrate portion,
A disk drive, wherein the tilt adjustment mechanism adjusts the tilt of the pickup by adjusting the angle of the sub-substrate and the angle of the other of the support portions . The pickup driving unit includes a connection leaf spring having a protrusion that is driven integrally with the pickup, a lead screw having a screw-shaped threaded concave portion that engages with the protrusion of the connection leaf spring, and a lead screw. The disk drive according to claim 1, further comprising a stepping motor that is driven to rotate. The tilt adjustment mechanism section includes a sub-board adjustment screw for adjusting the angle of the sub-board section with respect to the disk surface, a support section adjustment screw for adjusting the angle of the support section with respect to the other disk surface, and the adjustment. 3. The disk drive according to claim 1, further comprising an urging spring for urging the screw in a direction opposite to a screwing direction.

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