JP3973576B2 - Disc player - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc playback apparatus.
[0002]
[Prior art]
When a disc player receives an impact such as dropping, the disc mounted in the device collides with a member constituting a pickup drive mechanism for reproducing / recording the disc surface, and the disc surface is damaged. There's a problem. In order to solve this problem, there is a disk reproducing apparatus provided with a prevention mechanism for preventing scratches on the disk surface (see, for example, Patent Document 1).
[0003]
Japanese Patent Application Laid-Open No. 2004-228561 describes a disk reproducing apparatus in which a plurality of collision restricting portions serving as shock absorbing materials are provided at positions facing the edge of a disk mounted on a turntable. In the invention described in Patent Document 1, the collision restricting portion is disposed so that the distance between the collision restricting portion and the disk is narrower than the gap between the pickup and the drive mechanism for driving the pickup and the disk surface. .
[0004]
Since the collision restricting portion is provided, even if the pickup drive mechanism is tilted by an impact or the distance between the disk and the pickup is reduced due to the disk being tilted or bent, the disk surface is the pickup and its drive mechanism. And the disc surface is not scratched.
[0005]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-40350 (FIG. 1 etc.)
[0006]
[Problems to be solved by the invention]
Recently, in order to improve the disk reading performance, a disk reproducing apparatus equipped with a skew adjustment mechanism that adjusts the angle and distance of the pickup with respect to the disk surface at any time by causing the pickup to follow steady disk vibration is also known. ing.
[0007]
In a disc reproducing apparatus provided with this skew adjustment mechanism, the distance between the pickup and the disc surface changes due to the adjustment of the pickup. For this reason, in the case of a conventional disk reproducing apparatus, it is necessary to provide a disk receiver in consideration of the case where the pickup is set close to the disk surface.
[0008]
However, when the collision restricting portion is provided in consideration of the rapid approach between the pickup and the disc as described above, it is necessary to bring the collision restricting portion closer to the disc as the disc reproducing apparatus becomes thinner. There is no longer enough room. As a result, during a normal reading operation, the collision restricting unit and the disk frequently collide with each other, and there is a high risk that the reading operation will be hindered.
[0009]
In view of the above-described problems, an object of the present invention is to prevent a disk from being damaged when an impact occurs and to prevent a reading error from occurring in a disk reproducing apparatus having a skew adjusting mechanism.
[0010]
[Means for Solving the Problems]
The disc reproducing apparatus of the present invention is attached to the first chassis member, the second chassis member that is swingably mounted on the first chassis member, and the second chassis member so as to be movable. An optical pickup, and a skew adjusting mechanism that adjusts a deviation of the optical axis with respect to the optical disc so as to follow an approach operation and a separation operation of the optical pickup tip with respect to the surface of the optical disc by adjusting the skew of the optical pickup. The second chassis member is characterized in that the second chassis member is provided with a disk receiving portion that is always positioned closer to the optical disk.
[0012]
Further, another aspect of the present invention, in the disk reproducing apparatus described above, the second chassis member, the major and minor axes made swingable relative to the first chassis member is provided, the optical pickup to the major and minor axes It is characterized in that a disk receiving portion is provided on a member that is slidably attached and attached to the main shaft and the sub shaft in a bridge shape.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a disk reproducing apparatus according to the present invention will be described below in detail with reference to FIGS. First, skew adjustment will be described, and then a mechanism for preventing scratches on the disk surface will be described.
[0014]
First, the skew adjustment will be described. FIG. 1 is a plan view showing a skew adjustment mechanism in an embodiment of a disk reproducing apparatus according to the present invention. FIG. 2 is a plan view showing a traverse chassis that can swing with respect to the main chassis as the first chassis member of the skew adjusting mechanism shown in FIG. 1 and other members. FIG. 3 is a configuration diagram for explaining an operation at the time of radial adjustment of the main shaft and the traverse chassis in the skew adjustment mechanism shown in FIG. 1. 4A and 4B are views showing a radial adjustment skew cam attached to the end of the main shaft shown in FIG. 1, wherein FIG. 4A is a front view and FIG. 4B is a side view. FIG. 5 is a configuration diagram for explaining an operation at the time of tangential adjustment of the traverse chassis in the skew adjustment mechanism shown in FIG.
[0015]
The skew adjustment mechanism 1 is housed in the main body of a disk reproducing apparatus for reproducing or recording an optical disk such as a CD-ROM, DVD, MD, etc., and a cushioning material is placed on a mechanical base (not shown) housed in the main body. A main chassis 2 that is a first chassis member disposed via the traverse chassis 3 that is a second chassis member placed on the main chassis 2, and is slidably disposed with respect to the traverse chassis 3. And an optical pickup assembly 5 on which the optical pickup 4 is mounted.
[0016]
A spindle motor assembly 7 in which a turntable 6 (see FIG. 3) is directly connected to a motor shaft is fixed to the main chassis 2. Further, a reinforcing metal plate 8 is fixed to the main chassis 2 so as to cover the main chassis 2 by screwing or the like.
[0017]
Further, a thread motor assembly 9 for sliding the optical pickup assembly 5 is fixed to the main chassis 2. The thread motor assembly 9 includes a thread motor 10 and a motor shaft 11 of the thread motor 10. A lead screw 12 is formed on the motor shaft 11. The tip of the motor shaft 11 is supported by a bearing 13 provided on the reinforcing sheet metal 8.
[0018]
The claw 5 a of the optical pickup assembly 5 is engaged with the lead screw 12. When the thread motor 10 starts and the lead screw 12 rotates, the claw 5a moves along the groove of the lead screw 12. As a result, the optical pickup assembly 5 slides in the left-right direction in FIG.
[0019]
The reinforcing sheet metal 8 has legs 8a (only one upper position is shown in FIG. 1) at a plurality of positions, and is fixed to the main chassis 2 by the legs 8a. Further, the flat portion 8b of the reinforcing sheet metal 8 is disposed in parallel with the plane of the main chassis 2 with a foot 8a between the main chassis 2 and a space in the front-rear direction of the page in FIG. A hole is provided in the flat surface portion 8b, and the traverse chassis 3 is disposed in the hole.
[0020]
As shown in FIG. 2, the traverse chassis 3 has a sheet metal having a rectangular hole 3a for arranging the optical pickup assembly 5 to be slidable and a round hole 3b for arranging the spindle motor assembly 7. It is formed with. A main shaft 14 and a sub-shaft 15 for supporting and guiding the optical pickup 4 are provided on both sides in the vertical direction in FIG. 1 of the traverse chassis 3 (both sides of the rectangular hole 3a).
[0021]
The optical pickup assembly 5 that holds the optical pickup 4 is supported so as to be slidable along the main shaft 14 and the sub shaft 15. Further, a claw 5 a provided on an extending portion 5 b further extending from one end (the lower end in FIG. 2) of the optical pickup assembly 5 is engaged with the lead screw 12.
[0022]
For this reason, the optical pickup assembly 5 can slide in the rectangular hole 3 a of the traverse chassis 3 along the main shaft 14 and the sub shaft 15 by the driving force of the sled motor 10. By this operation, the optical pickup 4 reads the signal recording surface of the optical disc 16 while moving between the inner periphery and the outer periphery of the signal recording surface of the optical disc 16 placed on the turntable 6.
[0023]
Further, the traverse chassis 3 is disposed so as to be swingable with respect to the reinforcing sheet metal 8 fixed to the main chassis 2. Hereinafter, each structure of a mechanism for adjusting the optical axis of the optical pickup 4 attached to the traverse chassis 3 with respect to the optical disc 16, that is, a skew adjustment mechanism will be described.
[0024]
As shown in FIG. 3, a placement portion 17 that protrudes toward the main chassis 2 side is provided on the lower surface in the vicinity of both left and right ends of the traverse chassis 3. The lower surface of the placement portion 17 is in contact with a compression coil spring 18 disposed on the main chassis 2.
[0025]
For this reason, the traverse chassis 3 is biased upward by the compression coil spring 18. A main bearing portion 19 that protrudes upward is provided on the upper surface of the traverse chassis 3. The upper surface of the main bearing portion 19 is formed as a concave surface, and the main shaft 14 is rotatably fitted in the concave surface.
[0026]
Further, radial adjustment skew cams 20 and 21 are attached to both ends of the main shaft 14 so as to be interposed between the main chassis 2 and the traverse chassis 3 and to be rotatable. FIG. 4 is a view showing a part of the radial adjustment skew cam 20 of the skew adjustment mechanism 1 shown in FIG. The radial adjustment skew cam 21 has the same configuration as the radial adjustment skew cam 20.
[0027]
As shown in FIG. 4, the radial adjustment skew cam 20 has a step that extends in a spiral shape from the end of the main shaft 14 toward the outer side and has a substantially conical shape with a reduced diameter. The radial adjustment skew cam 20 is configured such that the height of the axial center of the traverse chassis 3 is unchanged.
[0028]
The radial adjustment skew cam 20 is rotated together with the main shaft 14 by a skew adjustment drive source (not shown) in a state where the spiral step is engaged with the reinforcing sheet metal 8 fixed to the main chassis 2 as necessary. It is done. Then, the radial adjustment skew cam 20 is sent along the spiral shape to the reinforcing sheet metal 8 so that one side of the main shaft 14 is lowered and the other side of the main shaft 14 is raised. That is, the main shaft 14 swings about the center in the longitudinal direction as a fulcrum Z. As a result, the distance between the optical pickup 4 and the optical disc 16 changes, and adjustment of the optical axis deviation (skew adjustment) with respect to the optical disc 16 is performed.
[0029]
Further, at the center of the upper end of the traverse chassis 3 in FIG. 1, a skew adjusting edge portion 22 that protrudes further upward in FIG. 1 is provided. A hole (not shown) is formed in the edge 22 for skew adjustment. As shown in FIG. 5, a tangential adjustment screw 24 is fitted in the hole. A screw receiving portion 23 into which a tangential adjustment screw 24 is fitted is provided at a position coaxial with the hole of the reinforcing sheet metal 8. Further, a compression coil spring 25 is disposed in the gap between the neck portion of the tangential adjustment screw 24 and the screw receiving portion 23.
[0030]
By rotating the tangential adjustment screw 24 as necessary by a skew adjustment drive source (not shown), the tangential adjustment screw 24 is lowered in the axial direction while compressing the compression coil spring 25, or the compression coil spring 25 is moved downward. Ascending while moving in the axial direction. Then, the traverse chassis 3 at the tangential adjustment screw 24 is raised or lowered depending on the rotation direction of the tangential adjustment screw 24. That is, the upper end side in FIG. 5 of the traverse chassis 3 swings in the left-right direction in FIG. 5 with the main shaft 14 as a fulcrum. As a result, the traverse chassis 3 is tilted and adjustment of the optical axis deviation (skew adjustment) between the optical pickup 4 and the optical disc 16 is performed.
[0031]
As described above, in the present embodiment, the traverse chassis 3 freely swings with respect to the main chassis 2 by adjusting the inclination of the main shaft 14 and adjusting the rotation of the tangential adjustment screw 24. As a result, the optical pickup assembly 5 swings together with the traverse chassis 3, and the deviation of the optical axis of the optical pickup 4 with respect to the optical disk 16 is adjusted.
[0032]
Next, a mechanism for preventing the disk surface from being damaged will be described with reference to FIGS.
[0033]
A first disk receiving portion 26 and a second disk receiving portion 27 are provided on the upper surface of the traverse chassis 3, that is, the surface on which the main shaft 14 and the auxiliary shaft 15 are placed. The first disk receiving portion 26 is provided at a position on the outer side in the axial direction of the auxiliary shaft 15. The first disk receiving portion 26 is provided so as to protrude from the respective parts of the traverse chassis 3 including the main shaft 14 and the auxiliary shaft 15 and the respective parts of the optical pickup assembly 5 including the optical pickup 4 to the disk surface side of the optical disk 16. It has been.
[0034]
Further, the second disk receiving portion 27 is provided at a position below the main shaft 14 (outside the main shaft 14) in FIG. Like the first disk receiving portion 26, the second disk receiving portion 27 is more than each portion of the traverse chassis 3 including the main shaft 14 and the auxiliary shaft 15 and each portion of the optical pickup assembly 5 including the optical pickup 4. Projecting to the disk surface side of the optical disk 16.
[0035]
Both the disk receiving portions 26 and 27 described above are made of a resin member. Further, as shown in FIG. 2, both disc receiving portions 26 and 27 are arranged in the vicinity of the outer peripheral edge of the optical disc 16 placed on the turntable 6 (see FIG. 3). Both disk receiving portions 26 and 27 are integrally fixed to the traverse chassis 3 and move integrally with the traverse chassis 3 by skew adjustment. For this reason, both the disk receiving portions 26 and 27 operate integrally with the optical pickup assembly 5 placed on the traverse chassis 3.
[0036]
That is, both the disk receiving portions 26 and 27 move following the approaching operation and the separation operation of the optical pickup 4 with respect to the surface of the optical disk 16. Further, both disk receiving portions 26 and 27 are always closer to the optical disk 16 than the optical pickup 4 and the optical pickup assembly 5. Therefore, even if the optical disc 16 is bent or tilted in the disc reproducing apparatus due to vibrations due to impact or the like, even if the optical disc 16, the optical pickup 4 and the optical pickup assembly 5 approach each other, both disc receiving portions The optical pickup 4 and the optical pickup assembly 5 do not come into contact with the optical disc 16 due to bumps 26 and 27 colliding with the vicinity of the outer peripheral edge that is not the signal recording portion of the optical disc 16.
[0037]
Therefore, the signal recording surface of the optical disc 16 is protected without colliding with the optical pickup 4 and the optical pickup assembly 5. Further, the optical pickup 4 side is not damaged by the collision with the optical disk 16.
[0038]
According to this embodiment, since both the disk receiving portions 26 and 27 are always arranged closer to the optical disk 16 than the optical pickup 4, the disk reproducing device is made thin, and the optical pickup 4 and the optical disk 16 Even if the distance is reduced, both disk receiving portions 26 and 27 come into contact with the optical disk 16 and there is no direct impact on the optical disk 16. Further, according to this embodiment, since both the disk receiving portions 26 and 27 follow the skew adjustment operation of the optical pickup 4, the optical disk 16 is frequently used even if the distance between the optical disk 16 and the optical pickup 4 is small. The two disk receiving portions 26 and 27 do not hit each other.
[0039]
As mentioned above, although the embodiment of the skew adjustment device according to the present invention has been described in detail, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the first disk receiving portion 26 is provided on the outer side in the axial direction of the auxiliary shaft 15, and the second disk receiving portion 27 is provided on the outer side in the width direction of the main shaft 14. It is not limited to.
[0040]
The first and second disk receiving portions 26 and 27 are disposed at any positions as long as the first and second disk receiving portions 26 and 27 face the optical disk 16 placed on the turntable 6 and swing with the optical pickup 4 by skew adjustment. You may do it.
[0041]
In the above-described embodiment, the first and second disk receiving portions 26 and 27 are provided in the traverse chassis 3. However, if the first and second disc receiving portions 26 and 27 are provided in a member that operates integrally with the optical pickup 4 by skew adjustment, The traverse chassis 3 may not be provided directly.
[0042]
For example, as shown in FIG. 6, a resin member 30 bridged in a bridge shape is provided on the main shaft 14 and the sub shaft 15 on the traverse chassis 3, and the first disk receiving portion 31 and the second disk member 30 are provided on the upper surface of the resin member 30. The disc receiving portion 32 may be provided.
[0043]
【The invention's effect】
As described above, according to the present invention, in a disk reproducing apparatus having a skew adjustment mechanism, it is possible to prevent the disk from being damaged when an impact occurs and to prevent a reading error from occurring.
[Brief description of the drawings]
FIG. 1 is a plan view showing a skew adjustment mechanism in an embodiment of a disk reproducing apparatus according to the present invention.
2 is a plan view showing a traverse chassis that can swing with respect to a main chassis serving as a first chassis member of the skew adjusting mechanism shown in FIG. 1 and other members. FIG.
3 is a configuration diagram for explaining an operation at the time of radial adjustment of a main shaft and a traverse chassis in the skew adjustment mechanism shown in FIG. 1; FIG.
4A and 4B are diagrams showing a radial adjustment skew cam attached to the end of the main shaft shown in FIG. 1, wherein FIG. 4A is a front view, and FIG. 4B is a side view.
5 is a configuration diagram for explaining an operation at the time of tangential adjustment of a traverse chassis in the skew adjustment mechanism shown in FIG. 1; FIG.
FIG. 6 is a plan view showing a part of a skew adjustment mechanism in another embodiment of the disk reproducing apparatus according to the present invention.
[Explanation of symbols]
1 Skew adjustment mechanism 2 Main chassis (first chassis member)
3 Traverse chassis (second chassis member)
4 Optical pickup 5 Optical pickup assembly 14 Main shaft 15 Sub shaft 26 First disc receiving portion 27 Second disc receiving portion 31 First disc receiving portion 32 Second disc receiving portion

Claims (2)

An optical disc comprising: a first chassis member; a second chassis member mounted on the first chassis member so as to be swingable ; and an optical pickup movably attached to the second chassis member. In the skew adjustment mechanism that adjusts the deviation of the optical axis relative to
A disc receiving portion that is always located closer to the optical disc than the front end of the optical pickup so as to follow the approaching operation and the separating operation of the front end of the optical pickup by the skew adjustment of the optical pickup with respect to the surface of the optical disc . A disc reproducing apparatus provided in the chassis member . Said second chassis member, the first major and minor axes of the pivotably to the chassis member is provided, the optical pickup to the major and minor axes mounted slidably, in the main shaft and countershaft 2. The disk reproducing apparatus according to claim 1, wherein the disk receiving portion is provided on a member attached in a bridge shape.

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